ti dcdc solutions for handheld and low standby power...

TI DCDC Solutions for Handheld and Low Standby Power Devices

Kean Pan

Business Development Engineer

1

TI Information – Selective Disclosure

Agenda

• Challenges for DCDC on Handheld / Low Power Devices

• DCS-Control Overview and Devices

• MicroSiP Modules

• Multi-phase DCDC for Processor Power

• DCDC for Multi-cell Application

• Ultra Low Power DCDC

2


Challenges for DCDC on Handheld / Low Power Devices

• Smaller solution size / higher power density

• Higher efficiency Extends operation time of application

Reduces overall system temperature

• Longer operating and stand-by time Active communication with application, e.g. DVS

Lower quiescent current, Snooze Mode

• Lower solution cost Less external components

Smaller external components

• Lower EMI and system noise No need for filtering

Supporting audio, optical and RF systems


4

DCS-Control Overview and Devices


DCS Control™ - Stands for

• High efficiency over the entire load current range

• Fastest load transient response

• Seamless transition into Power Save Mode

• Stable over a large range of output capacitance typ 10uF to 100uF

5


Traditional PWM Control Review

PFM Circuitry

OSC = Fixed Frequency

Internal Compensation

PFM Detection Circuitry


Summary – PWM control architecture

• Complex and silicon intensive (costly) Power Save Mode

entry, exit and operation mode circuits

• Loop compensation required

• Fixed switching frequency with +/-20% typical tolerance

We need something new to reach the next level


Basic Hysteretic Control

s

Vin Vout Vout ESRf

Vhys L Vin

Switching Frequency Varies and is

a Function of ESR, L and Vhys


Considerations – Hysteretic Control

• Possibly simplest control circuit

• Fastest response to input voltage and output voltage perturbations

among all control techniques

• Switching frequency depends on Vhys, L, Vin, Vout and ESR

– Frequency variation

• Inherently stable operation

• Modern DC DC converters have no output capacitor ESR

• Compensate for effects preventing good output voltage accuracy

• Implementation of Power Save Mode

• Control or acceptance of switching frequency variation

Technical items to be solved

Requires changes to basic hysteretic control


TPS62130 Block Diagram


DCS-Control™

Error Amplifier

for Precise DC

Regulation

Hysteretic

Comparator for

Fast Response

to Changes in

Output Voltage

Proprietary Ramp Circuitry Feeds VOS (Vout) to Comparator

On Timer for

Power Save Mode

and Constant

Operating

Frequency

FB

VOS (Vout)

Feedforward Capacitor

Only Required for Power

Save Mode Mode

Performance


What Does DCS-Control™ Provide?

•Superb Transient Response

•Seamless Transition To Power

Save Mode


Old versus DCS-Control™ Triangle Load Sweep (10mA – 1.0A)

TPS62110 TPS62150

CH1 – VOUT @ 50mV/div

CH2 – IL @ 1A/div

CH3 – ILOAD @ 1A/div

CH1 – VOUT @ 50mV/div

CH2 – IL @ 1A/div

CH3 – ILOAD @ 1A/div

No disturbing bursts during the transition

between PWM and Power Save Mode

Output voltage

Inductor Current

Load Current


How Does DCS-Control™ Go from Power Save Mode to PWM Mode?

DCS-Control™ = Direct Control with

Seamless Transition to Power Save Mode

Seamlessly!

Operating mode is the same in Power Save

Mode and PWM mode, so there is no mode

„switch‟ -> no possibility for glitch during mode

change


Inductor

Current

1A/div

SW node

Vout

50mV/div

Transition from Power Save Mode to PWM

Load Current

1A/div

Low Output Voltage Dip and Fast Recovery Time

&

Seamless Transition from Power Save Mode with No Overshoot

No load to 1A load step with 1uH and 22uF

~600 ns

~2% Vout


16

Standard Step down converter Portfolio 300mA-500mA

SOT23, 2x2

600mA

SOT23, 2x2

1A, 1.2A, 1.6A

MSOP, 2x2, 3x3

2A

2x2

3A

3x3

1st Generation L=4.7uH to 10uH

TPS62200

TPS62220

TPS62000

TPS62020

TPS62040

2nd Generation L=1.0uH to 2.2uH

TPS62240

TPS62270***

TPS62260

TPS62290

TPS62060

TPS62065

DCS Control™ L=1.0uH to 2.2uH

Cout up to 100uF

TPS62230

TPS62080 TPS62085* TPS62090

Value Devices TPS62560 TPS62590

TLV62080

TLV62065

TLV62090


17

TPS62090 - 3A High efficiency step down converter Features

• VIN range from 2.5V to 6V

• 2.8MHz/1.4MHz switching frequency

• Adjustable and fixed output voltage options

• 100% duty cycle mode for lowest dropout

• 20uA quiescent current in Power Save Mode

• Output voltage discharge function

• Adjustable softstart and short circuit protection

• 10uF to 100uF output capacitance

• Thermal shutdown

• Package 3x3 QFN package

Applications

• Notebook, Netbook computers

• Solid State Drive

• Hard Disk Drive

• Processor supply

• Distributed power supplies

• Battery powered applications

Smallest solution size 2.8MHz with 0.47uH

Highest efficiency 1.4MHz with 1uH


Efficiency 1.4MHz, 1.8V output

18

50

55

60

65

70

75

80

85

90

95

100

0.00001 0.00010 0.00100 0.01000 0.10000 1.00000 10.00000

Eff

icie

ncy [%

]

Iout [A]

TPS62090 PG 1.0 Vout = 1.8V // Board 2 // 1.4MHz // Hiccup dis. // CL max 1-Eff 2D Iout 25°C

2.7 3.7 5.0

90% efficiency at 2A

1uH inductor

88% efficiency at

1mA

Coilcraft XFL4020

4x4x2.1


Efficiency 2.8MHz, 1.8V output

19

50

55

60

65

70

75

80

85

90

95

100

0.00001 0.00010 0.00100 0.01000 0.10000 1.00000 10.00000

Eff

icie

ncy [%

]

Iout [A]

TPS62090 PG 1.0 Vout = 1.8V // Board 2 // 2.8MHz // Hiccup dis. // CL max 1-Eff 2D Iout 25°C

2.7 3.7 5.0

89% efficiency at 2A

400nH inductor

Coilcraft XFL4020

4x4x2.1


Fastest possible load transient response

20

Immediate and fastest

response to a load

step due to 100%

switch turn on

CH2:Vout, CH4=Iload, CH1=Inductor current

Load Step 0.2A to 2A


Seamless transition into Power Save Mode

21 CH2:Vout, CH3=Iload, CH4=Inductor current

Output voltage ripple

<20mV under all

conditions


Stable from 10uF up to 100uF output capacitance

22

CH2:Vout, CH4=Iload, CH1=Inductor current

1uH/10uF 1uH/100uF

Load Step 0.2A to 2A


23

TPS62080 – 1.2A High efficiency step down converter Features

• Vin range from 2.5V to 6V

• 3MHz switching frequency

• Adjustable and fixed output voltage options

• 100% duty cycle mode for lowest dropout

• 20uA quiescent current in Power Save Mode

• 6.5uA quiescent current in SNOOZE Mode

• Output voltage discharge function

• 10uF to 100uF output capacitance

• Thermal shutdown

• 3x3 QFN package

Applications

• Battery powered applications

• Distributed power supplies

• Notebook, Netbook computers

10% efficiency increase with

SNOOZE Mode


24

90% efficiency at 0.6A

1uH inductor

60% efficiency at

100uA in SNOOZE

Mode


TPS62080 load transient response

25

Only 25mV drop for

a 1A load step!


DCS Control™ - Stands for

• High efficiency over the entire load current range

• Fastest load transient response

• Seamless transition into Power Save Mode

• Stable over a large range of output capacitance typ 10uF to 100uF

26

MicroSiPTM DC/DC Converters

Fully Integrated Power Solutions

SiP … What is it all about?

1. Smallest solution size : Innovative 3D integration

2. Optimized electrical performance: Comparable efficiency,

lower EMI

3. Ease of use: Reduced HW design workload / application issues

4. One stop shopping

SiP stands for System in Package, i.e. a multiplicity of devices acting in concert

to perform one or more functions unattainable by a single (cost effective) device.

The package is the interconnect medium used to create a virtual “single” device.

A SiP approach can offer a significant number of advantages.

The advantages coming along with this technology can only be realized if:

- The rationale for doing the SiP meets certain criteria.

- There is a balance between SiP lamitate area vs. silicon size.

Order of Target Customer Preferences

1. Size

– Solution size >45% smaller

compared to discrete solution

– Less than 1mm height

2. Ease of Use

– No External Components needed

– Simplified PCB Layout

– One-Stop-Shop

3. Performance

– Superior EMI and noise

performance

– Similar feature set and efficiency

as discrete DC/DC converters

1 mm (max)

PicoStarTM

PicoStarTM

TPS82671/x675 600mA Fully Integrated, Low Noise Step-Down Converter in MicroSiP™

• Regulated Switching Frequency: 5.5MHz

• All required external components are

integrated

• Spread Spectrum, PWM Frequency Dithering,

High PSRR and low ripple Power Save Mode

• Automatic Power Safe Mode transition or

forced PWM Mode operation

• Input voltage: 2.3V to 4.8V

• Allows < 7mm2 total solution size, thus provides

90mA/mm2

• One-Stop-Shop, reduced HW design workload and no

more questionable designs

• Supports noise sensitive applications through improved

RF spurious performance and radiated noise reduction

• Allows to choose between high efficiency over entire

load range (PSM) or regulated fixed frequency

• Supports Li-Ion batteries with extended voltage range

TPS82671 1.80 Vout, PFM/PWM Mode

TPS82675 1.20 Vout, PFM/PWM Mode

• Cell Phones, Smart-Phones

• Portable Audio/Video

• Digital TV, WLAN, GPS and Bluetooth™

• Portable Medical Devices

MircoSiP™ Module Overview

Device Output

Voltage [V]

Supply Voltage

Range [V]

Output Current

[mA]

Features

TPS82676 1.10 2.3 – 4.8 600 PFM/PWM Mode, Output Cap Discharge, SSM

TPS82677 1.20 2.3 – 4.8 600 PWM Mode, Output Cap Discharge


TPS82675 1.20 2.3 – 4.8 600 PFM/PWM Mode, SSM






TPS82690 2.85 2.3 – 4.35 500 PFM/PWM Mode, Output Cap Discharge

TPS82695 2.50 2.3 – 4.35 500 PFM/PWM Mode, Output Cap Discharge

Step-Down Converter

Boost Converter

Device Output

Voltage [V]

Supply Voltage

Range [V]

Output Current

[mA]

Features

TPS81256 5.0 2.5 – 5.5 550+ PFM/PWM Mode, Load Disconnect

1 mm (max)

SSM = Spread Spectrum Modulation


Multi-phase DCDC for Processor Power

32


App Processor Trends

33

10

100

2002 2004 2006 2008 2010 2012

pro

cess

no

de

[nm

]

90nm

60nm

45nm

28nm

• Process node scaling

• Higher clock rates and SoC

integration

– Driven by performance need

– Marketing driven

• Reduced process scale:

– Increased leakage

– Higher process variation

– Reduced VDD and wider distribution

– Reduced parasitic gate capacitance

overcompensated by • Increased gate #

• Higher clock rates

• Battery technology – Does not keep pace

– New batteries:

• Ever increasing power demand

2

static dynamic DD Gate CR DDP P P f(V ) f(C ,#,f ,V )


Key Focus: High Efficiency Operation

Load Current

Eff

icie

nc

y

PFM Split Power Stage

PFM 1-ph Power Stage

PWM 1-ph Power Stage

PWM 2-ph Power Stages

• Ultra Light load: PFM split power stage. – Parasitic FET gate capacitance is kept at minimum number for lowest currents

• Light load: single phase PFM operation. – PFM maintains high efficiency conversion.

• Medium load: single phase PWM operation – Small RDS,on FETs keep efficiency high at medium loads

• High load: multi-phase PWM operation – Phases operate in parallel. The effective RDS,on is divided by the number of phases. In addition, losses in the inductor are kept as small as

possible since the DCR is divided as well.

• Incorporated Charge-Pump – Si-Anode low-VIN efficiency boost/ process variation /peak output current efficiency boost

→ high efficiency operation over the complete load range


Key Focus: Smallest Solution Size

• Smallest solution size is achieved by

– Stand-alone concept: compared to PMICs, decoupling caps can be saved, placement can be optimized

– Small input and output capacitors

– Cancelling additional external components

– Enabling smallest inductors • Single phase: allowing tiniest inductors

by high frequency operation and current limits optimized for choosing tiny inductors

• Multi phase: The multi-phase technology allows for choosing smallest inductors with small saturation currents. The overall size of the n inductors is smaller than a single inductor with an according saturation current would be. Still, smaller effective DCRs can be achieved keeping inductor losses small by putting them in parallel. Height requirements (<1.2mm, <1.0mm, <0.8mm) can be met.

35

Volume Factor 4 for 2x current.

½ I (0.47uH) vs. I (0.47uH)

Volume Factor 2 for 2x current for ½ inductance

½ I (0.47uH) vs. I (0.2uH)


Multi phase vs. two inductors in parallel

• DCR variation causes inductor current to be unequally distributed. A PCB temperature gradient might enforce this effect

– Efficiency suffers since the “seen” DCR is not DCR/2

– An inductor might run into saturation. A higher saturation current is required, increasing solution size

• No phase shedding feasible

• No phase inversed operation possible

• Regulation bandwidth limitation

36

• To achieve smallest solution size, tiny inductors are a must. Tiny inductors come with limited saturation current ratings. So why not putting simply two inductors in parallel to overcome height constrains?

• On TPS6238xx solutions, the current is actively balanced

• The efficiency benefits from both DCR and RDS,on in parallel reducing losses by 50% for two phases and by 66% for three phases

• Automatic phase shedding allows highest efficiency over the complete output current range

• The output voltage ripple is minimized by phase inverted operation

• EMI and input ripple are minimized by phase inverted operation

• The effective regulation bandwidth is increased with the number of phases

• Balancing and precise current limits allow the choice of tiniest inductors


TPS62385x Overview

• 4.7A 2-Phase Step-Down Converter

• Highest Efficiency

– Reduced Inductor and On-Chip losses by Multi Phase Design

– SmartRail Technology for highest Efficiency over the whole Load Range

– Integrated Charge Pump for low Battery Efficiency Boosting

– Low RDS,on Switches and Active Rectifiers

– Automatic dual-to-single Phase Transition

– Power Save Mode for Light Load Efficiency

• I²C High Speed Compatible Interface

• Excellent DC and AC Output Voltage Regulation

– Differential Load Sensing

– Multiplied Regulation Bandwidth by Multi Phase Design

– Precise DC Output Voltage Accuracy

– Reduced Output Voltage Ripple by 180°-Phase Shifted Operation

• Multiple Robust Operation and Protection Features

– Soft Start with 500μs Startup Time

– Power Good Indication

– Programmable Slew Rate at Voltage Transition

– Low Battery Voltage Ripple by Phase Shifted Operation

– Over Temperature Monitoring and Protection with programmable

thresholds

– Input Under Voltage Detection and Lockout

– Output Current Limit and Protection

– 7-bit SAR ADC for Output Current Monitoring

– Interrupt Signal for Exception Handling

• Programmable Output Voltage 10mV Steps – 0.5V to 1.77V

– Optional: VOUT can be analog controlled via VSEL

• 2.22mm x 2.44mm chip size

• 0.5mm pitch

– Enables low cost board version

– Best for power trace routing


TPS62386x Overview





















thresholds








• 0.5mm pitch




TPS62387x Overview





















thresholds








• 0.5mm pitch




DCDC for Multi-Cell Applications

40

DCS-Control™ Step-Down Converter VIN MAX >6V

Vin Vout Iout L - C Package Solution Size

[mm2] *

Features

TPS62120 2.0 to 15V ADJ,

2.0V

75mA 22uH/4.7uF 3x3 SOT 30 Iq=11uA, EN, PG,

2x2 SON (TPS62122),

DCS-ControlTM

TPS62125 3.0 to 17V ADJ,

1.8V

300mA 10uH/10uF 2x2 SON 40 Iq=11uA, Adj. EN, PG,

DCS-ControlTM

TPS62130 3.0 to 17V ADJ, 1.8,

3.3, 5.0V

3.0 A 1uH/22uF 3x3 QFN 95 Iq=17uA, EN, PG,

FSW, DEF, SS/TR,

DCS-ControlTM

TPS62140 3.0 to 17V ADJ, 1.8,

3.3, 5.0V

2.0A 1uH/22uF 3x3 QFN 95 Iq=17uA, EN, PG,

FSW, DEF, SS/TR,

DCS-ControlTM

TPS62150 3.0 to 17V ADJ, 1.8,

3.3, 5.0V

1.0A 1uH/22uF 3x3 QFN 85 Iq=17uA, EN, PG,

FSW, DEF, SS/TR,

DCS-ControlTM

TPS62160 3.0 to 17V ADJ, 1.8,

3.3, 5.0V

1.0A 2.2uH/22uF 2x2 SON 45 Iq=17uA, EN, PG,

DCS-ControlTM

TPS62170 3.0 to 17V ADJ, 1.8,

3.3, 5.0V

0.5A 2.2uH/22uF 2x2 SON 45 Iq=17uA, EN, PG,

DCS-ControlTM

* Estimated Total Solution Size based on EVM layout for fixed VOUT, incl. CIN, COUT and L

Pin to Pin Compatible

Pin to Pin Compatible

TPS6216x/17x Tiny 17V 0.5A/1A Step-Down Converter in 2x2 WSON

• DCS-Control™ topology: fast AC line and load transient

response plus seamless transition into Power Save Mode

• Supports high Output Capacitance of up to 200uF

• Works with small inductor and low ESR capacitors

• 100% Duty Cycle and 17uA typ. Quiescent Current

• Power Good Output

• General Purpose Point-of-Load

• Industrial Applications, e.g. PLC, measurement

• DSC Camera

• Enterprise Solid-state drives

• Low power DSP core applications

• Computing

• Maintains a stable and accurate output voltage

• Robust design through supporting many L-C

combinations and on board capacitance

• Allows cost efficient external components and

supports a total solution size of 45mm2

• Enables extended application run time through

lowest dropout and power consumption

• Indicates output voltage condition, e.g. for

system communication like startup

sequencing.

Released:

November 2011

TPS62160EVM-627

TPS62170EVM-627


22uF

1.8V / 3A

10uF

1μH(3 .. 17)V

3.3nF

TPS62131

PVIN

AVIN

EN

SS/TR

DEF

FSW

SW

VOS

PG

FB

AGND

PGND

100k

TPS62130/40/50: 3 - 17V VIN, 1-3A, 2.5MHz Step-Down Converters in 3x3mm QFN

• General Purpose POL

• Solid State Disk Drives

• Embedded and mobile Computing

• Industrial applications

• High VIN step down converter with small solution size

• 12V @ 3.3V / 3A utilizing a 1uH inductor

• DCS-ControlTM regulation is fast and accurate

• Low quiescent current and selectable switching

frequency for high efficiency

• VFB control allows current source applications

• High Efficiency Step Down Converter with DCS-ControlTM

• VIN range from 3 to 17V

• Adjustable VOUT from 0.9 to 6.0V

• Fixed VOUT options: 1.8V, 3.3V, 5.0V

• Output current up to: 3A (TPS62130)

2A (TPS62140)

1A (TPS62150)

• Seamless transition to Power Save Mode

• Pin-selectable switching frequency (full, half)

• 100% Duty Cycle Mode

• Programmable Soft Start and Tracking

• Quiescent current of 17uA (typ.)

• Power Good

DEF Pin Selectable Output Voltage

FSW Pin Selectable Switching Frequency

Cstart Adjustable Startup

TR FB Voltage Control

TPS62130EVM-505

TPS62140EVM-505

TPS62150EVM-505

Released:

November 2011


TLV6213x/5x: 4 .. 17V VIN, 3/1A, Step-Down Converters in 3x3mm QFN

• General Purpose POL

• Solid State Disk Drives

• Embedded and mobile Computing

• Industrial applications

• High VIN step down converter with small solution size

• 12V @ 3.3V / 3A utilizing a 1uH inductor

• DCS-ControlTM regulation is fast and accurate

• Low quiescent current and selectable switching

frequency for high efficiency

• VFB control allows current source applications

• High Efficiency Step Down Converter with DCS-ControlTM

• VIN range from 4 to 17V

• Adjustable VOUT from 0.9 to 5.0V

• Output current up to: 3A (TLV62130)

1A (TLV62150)

• Seamless transition to Power Save Mode

• Pin-selectable switching frequency (full, half)

• 100% Duty Cycle Mode

• Programmable Soft Start.

• Quiescent current of 17uA (typ.)

• Power Good

FSW Pin Selectable Switching Frequency Cstart Adjustable Startup

TR FB Voltage Control

22uF

1.8V / 3A

10uF

1μH(3 .. 17)V

3.3nF

TPS62131

PVIN

AVIN

EN

SS/TR

DEF

FSW

SW

VOS

PG

FB

AGND

PGND

100k


45

Ultra Low Power DC DC

Product Overview + Roadmap


46

Ultra Low Power - Product Status

• TPS62120 Industry's first commercial successful energy harvester in full production Iq=11uA

• CC430 solar demonstrator

• TPS61251 adjustable current limit boost converter with 2uA Snooze mode

• TPS62730 CC2540 Companion Step Cown Converter with 30nA standby mode

• TPS62125 300mA Step down Converter with 6uA EN comparator

47

Ultra low power device line up (RTM’ed)

DC/DC

Topology VIN IOUT Key Features Package

Application

TPS62120

TPS62122

Step Down 2V –

15V

75mA Iq = 11uA, DCS-

ControlTM

2x2 SON,

SOT23-8

Self powered wireless

switch, embedded

processing, Low Power

RF

TPS62730 Step Down 1.9V –

3.9V

100mA Iq 30nA in Bypass,

22uA in DC/DC mode,

DCS-ControlTM

1x1.5

SON

Low Power RF companion

DC/DC for CC2540/41,

CC430, CC1120 etc.

TPS62125 Step Down 3V –

17V

300mA 6uA Iq Input SVS,

13uA Iq active, VO

1.2V to 10V, DCS-

ControlTM

2x2 SON

8

Embedded processing,

current loops, energy

harvesting, 4 cell alkaline

powered sensors

TPS61220 boost 0.7V –

5.5V

200mA

SW

limit

Iq 5.5uA SC 70 - 6 1-3 cell alkaline powered

application e.g. sensors

TPS61251 boost 2.3V –

6.0V

2uA Iq snooze mode,

100mA - 1.5A

programmable input

current limit

2x2 SON Low Iq buffer cap charger

TPS62730 (TPS_Radio) 100mA DC/DC solution with Bypass Mode

• Selectable or Automatic Transition from

DC/DC to bypass mode

• Up to 95% Efficiency, 25uA (typ.) Quiescent

Current and 30nA (typ.) Shutdown Current

• Excellent low Output Voltage Ripple

• DCS-Control™ topology

• Package: 1mm x 1.5mm QFN and 0402 caps,

0603 inductor

• BLE (Bluetooth Low Energy)

• MSP430 and alike controller supply

• HVAC (Heating, Ventilating, and Air

Conditioning)

• RF4CE (ZigBee)

• Metering

• Smoke Detectors

• Extends application run time by up to 20%

• Support reduction of total power consumption from

battery

• Makes this device ideal for RF applications

• Enables seamless transition into Power Save Mode

and excellent transient and AC load regulation

• Small external components and small IC package

allow for solution size of <12mm2

TPS62730

VIN

ON/BYP STAT

GND VOUT

SW

V

2.1VOUTV

1.9V - 3.9VIN

C2.2

IN

µF

C2.2

OUT

µF

L 2.2 Hm

ONBYP

TPS62730EVM-726


High efficiency in PFM mode

2.5V Rising / 1.85V Falling UVLO Thresholds

, ,

,

Active Discharge Capacitor (TPS62120)

,

Power Good pin (TPS62120)

SOT-23-8 (TPS62120), 2x2 QFN (TPS62122)

Above 70% efficiency @ 100uA

Wide UVLO hysteresis window allows the storage of energy in

CIN until there is enough for the converter to efficiently transfer

to the output avoiding short cycling during buck power-up

Allows time control for power sequencing & a clear and sharp start

up voltage.

Notification of output voltage being regulated when Vout is greater

than 95% of the nominal value

Multiple solar cells

Inductive energy harvesters

Low Power RF Applications

Low Power Microprocessor

Industrial sensing (12V bus)

TPS62120, TPS62122 2V to 15V Input, 75mA Iout, 96% efficiency Step-Down Converter

TPS62122EVM-586

TPS62120EVM-640


High Efficiency

Above 70% @ 100µA for 10VIN


Proper start up from weak source

L

C4.7 F

OUT

µ

V =1.8VOUT

C 4.7

IN

Fµ

C 100

store

Fµ

5V300uASolarModule600Lux

Load100R

TPS62120 vs.TPS62231

TPS62120 UVLO hysteresis ~ 600mV TPS62231UVLO hysteresis ~100mV

Runtime ~ 4ms -> 130uWs Energy Runtime ~ 400us -> 13uWs

Larger UVLO Hysteresis more energy can be extracted from the storage capacitor

TPS62125 300-mA Step-Down Converter with Adjustable Enable Threshold and Hysteresis

• Adjustable ENABLE threshold and

hysteresis

• DCS-Control™ topology

• High efficiency over entire load and

supply voltage range

• Wide input voltage range: 3V - 17V

• 100% Duty Cycle for Lowest Dropout

• Energy Harvesting supplies

• Battery applications: 4x Alkaline or 2-4 Li-Ion cells

• 9V – 15V bus voltage rails

• Embedded Processing

• Inverter (negative VOUT)

• Extend application run-time through high design flexibility

• Maintains a stable output voltage through a fast AC line

and load transient response

• Increases Efficiency at very light loads (>60% at 100uA)

• Allows to capture the entire energy from the harvester;

tolerates multiple different supply types

• Achieves longest run-time by allowing the application to

operate close to the input voltage level

Released:

May 2012

TPS62125EVM-044


TPS62125 Programmable EN Comparator

VIN

REF

ON/SHDN VREF

EN

EN_hys

GND

VIN

ENComparator

REN1

REN2

REN HYS

Precise (3%) programmable start up threshold setting

Only 6uA quiescent current consumption

EN comparator with internal 50mV hysteresis

Increasing hysteresis with external resistor on EN-hys pin

VINVIN_startup

VIN_stop

VOUT

Hysteresis

DC/DC ON

DC/DC OFF

Proper VOUT ramp up


Thank you

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ti dcdc solutions for handheld and low standby power...

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