ame synchronous boost converter with low quie scent current · 2013-09-10 · ame 1 ame5177 rev....

AME

1

AME5177

Rev. A.01

Synchronous Boost ConverterWith Low Quiescent Current

n Typical Application

n Functional Block Diagram

n General Description

The AME5177 is a high efficiency synchronous boostconverter, which is based on a hysteretic controller topol-ogy using synchronous rectification to obtain maximumefficiency at minimal quiescent currents. The converterprovides a power supply solution for products poweredby a variety of batteries such as single-cell, dual-cell,tree-cell alkaline, NiCd or NiMH, or one-cell Li-Ion or Li-polymer battery.

The output voltage is internally programmable in a rangefrom 1.8V to 5V in increments of 0.1V. Moreover, theconverter can be switched off by an enable pin to mini-mize battery drain. The maximum average input currentis limited to 450mA for current limit.

n Features

±

n Applicationl All One-Cell, Two-Cell and Three-Cell Alkaline,

NiCd, NimH and Single-Cell Batteriesl Wireless Mousel Mobile-Applicationsl Hand-Held Devices

l Very Low Start-up Voltage at 0.8Vl Output Voltage Range: 1.8V~5V in 0.1V

incrementsl Output Voltage Accuracy 2%l Output Currents up to 100mAl No Schottky Diode Requiredl Support Inductor of Multilayer Typel Typical Shutdown Current Less than 0.7uAl Typical Quiescent Current Less than 6.5uAl Over Current Protectionl Over Temperature Protectionl Available in SOT-25, SOT-26 and DFN-6D

Packagel RoHS Compliant and Halogen Free

AME

2

AME5177

Rev. A.01


n Pin Configuration

SOT-25Top View

n Pin Description

SOT-26Top View

DFN-6D(2mmx2mmx0.75mm)

Top View

6

5

4

1

2

3

AME5177-AVYxxx1. NC2. GND3. EN4. OUT5. NC6. LX

* Die Attach: Conductive Epoxy

SOT-26Top View

AME5177-BEYxxx1. LX2. GND3. EN4. NC5. VOUT6. NC


AME5177-AEVxxx1. NC2. GND3. EN4. OUT5. LX


AME5177-AEYxxx1. NC2. NC3. GND4. OUT5. LX6. EN

* Die Attach: Non-Conductive Epoxy

1 32

5 4

AME5177

1 32

6 45

AME5177

1 32

6 45

AME5177

A B

1 1, 2 4, 6 1, 5 NC No connect Pin.

2 3 2 2 GND Ground.

3 6 3 3 EN Chip Enable (Active High).

4 4 5 4 OUT Output Voltage Pin.

5 5 1 6 LX Switch pin which connected to inductor.

Pin Name Pin Description

Pin No.

SOT-25 DFNSOT-26

AME

3

AME5177

Rev. A.01


n Ordering Information

Number of Pins

Package Type

Pin Configuration

AME5177 - x x x xxx

Output Voltage

A 1. NC E: SOT-2X V: 5 180: 1.8V(DFN-6D) 2. GND V: DFN Y: 6 190: 1.9V

3. EN 200: 2.0V4. OUT : :5. NC : :6. LX 490: 4.9V

500: 5.0VA 1. NC

(SOT-25) 2. GND3. EN4. OUT5. LX

A 1. NC(SOT-26) 2. NC

3. GND4. OUT5. LX6. EN

B 1. LX(SOT-26) 2. GND

3. EN4. NC5. VOUT6. NC

Pin Configuration Package Type Number of Pins Output Voltage

AME

4

AME5177

Rev. A.01


n Absolute Maximum Ratings

n Recommended Operating Conditions

Maximum Unit

-0.3V to 7 V

-0.3V to 7 V

-0.3V to 7 V

-0.3V to 7 V

2000 V

200 V

1000 V

150 oC

-65 to +150 oCStorage Temperature

Input Voltage

Parameter

Electrostatic Discharge (MM)

Electrostatic Discharge (CDM)

LX Voltage

Output Voltage

EN Voltage

Electrostatic Discharge (HBM)

Junction Temperature

Parameter Symbol Rating Unit

Input Voltage VIN 0.8 to 5.5

Output Voltage VOUT 1.8 to 5

Junction Temperature Range TJ -40 to +125

Ambient Temperature Range TA -40 to +85

oC

V

AME

5

AME5177

Rev. A.01


n Thermal Information

* Measure θJC on backside center of molding compound if IC has no tab.** MIL-STD-202G 210F

Parameter Package Die Attach Symbol Maximum Unit

Thermal Resistance*(Junction to Case) θJC TBD

Thermal Resistance(Junction to Ambient) θJA TBD

Internal Power Dissipation PD TBD mW

260 oC

Non-Conductive EpoxyoC / W

Lead Temperature ( soldering 10 sec)**

SOT-25SOT-26DFN-6D

AME

6

AME5177

Rev. A.01


n Electrical Specifications

TA = 25oC, unless otherwise noted.

Parameter Symbol Test Condition Min Typ Max Units

Minimum Input VoltageAt Startup

VSTART-UP IOUT=1mA, VIN:02V 0.8 0.95 V

Hold-on Voltage(V) VHOLD IOUT=1mA, VIN:2V0V 0.7 V

Output Accuracy ∆VOUT -2 2 %

VOUT=1.8V 1.8 V

VOUT=2.1V 2.1 V

VOUT=2.2V 2.2 V

VOUT=2.7V 2.7 V

VOUT=3.0V 3 V

VOUT=3.3V 3.3 V

VOUT=5.0V 5 V

Quiescent Current IQ VOUT x 1.2 6.5 10 µA

Rectifying Switch on Resistance RDS(ON)_P VOUT=3.3V 1 Ω

Main Switch on Resistance RDS(ON)_N VOUT=3.3V 1 Ω

EN Logic-High Voltage VIH 0.8 V

EN Logic-Low Voltage VIL 0.4 V

EN Input Current IEN Clamp on GND or VOUT 0.1 1 µA

Shutdown Current ISDVEN=0V, VIN=1.2V

IOUT=0mA0.7 µA

Switch Current Limit ISW VOUT=3.3V 450 mA

NMOS Leakage Ileakage_N VOUT=3.3V 1 µA

PMOS Leakage Ileakage_P VOUT=3.3V 1 µA

Thermal Shutdown Temperature TSD 150 oC

Thermal Shutdown Hysteresis ∆TSD 20 oC

DC/DC Stage

Protection

Enable Control (SOT-25 Only)

Output Voltage ∆VOUT

Power MOSFET

AME

7

AME5177

Rev. A.01


The AME5177 is a high efficiency synchronous boostconverter, which is based on a hysteretic current control-ler topology using synchronous rectification to obtainmaximum efficiency at minimal quiescent current condi-tion. The converter allows the use of low cost chip induc-tor (Support Inductor of Multilayer Type) and small ce-ramic input and output capacitors total only three exter-nal components.

Enable Function

The AME5177 has a dedicated enable pin. The deviceis enabled when pull the EN above 0.8V. Furthermore,the device is disabled when pull the EN below 0.4V.

Over Current Limit

The AME5177 provide the current limit protection func-tion. When inductor current reaches the internal switchcurrent limit threshold, the internal switch will be turnedoff. When the over current state is eliminated, the ICresumes its nornal operation.

Over Temperature Protection

When the junction temperature exceeds 150oC, the overtemperature protection circuit turns off the internal switch,the converter will not turn back on until the device hascooled approximately 20 degrees. For normal operation,the junction temperature cannot exceed TJ=+125oC.

n Detailed Description n Application InformationInductor

The Inductor is required to supply energy to the loadwhile being driven by switched high side MOSFET.Choose inductance that will affect the period proportionalto inductance. Therefore, choosing greater inductancecan improve system efficiency since the switching fre-quency is decreased to reduce system switching losses.Finally, the choice of which style inductor to utilize mainlydepends on the price vs. size requirements and any EMIconstraints. Suggesting the inductance range is from10µH to 33µH.

Input Capacitor

Use low ESR capacitors for the best performance.When using ceramic capacitors make sure that they haveenough capacitance to provide sufficient charge to pre-vent excessive voltage ripple at input terminal. Further-more, an input capacitor improves EMI problems in thepower supply circuit.

Output Capacitor

The output capacitor is required to place enough ca-pacitance to improve the system efficiency and outputripple. Ceramic capacitors are recommended. Low ESRcapacitors are preferred to keep the output voltage ripplelow. Furthermore, the output capacitance can be esti-mated by:

Where L is the inductance. The characteristics of theoutput capacitor also affect the stability transient behav-ior of the regulation system. The AME5177 can be opti-mized for a wide range of capacitance and ESR values,such as solid tantalum, ceramic, and aluminum electro-lytic capacitors.

2L

COUT ≥

AME

8

AME5177

Rev. A.01


Layout Considerations

PCB Layout is important to achieve stable operation for switching power system at the high switching frequenciesand high peak currents conditions. For best results, follow these guidelines:

(1) The input capacitor placed as close and wide as possible to VIN and GND pins of the IC is recommended.

(2) The output capacitor placed as close and wide as possible to VOUT and GND pins of the IC is recommended.

(3) Place Lx Pin as short and wide to the IC as possible.

Table 1. List of Components

Typical Application Circuit

Component Reference Manufacturer Part Number Value

C1 Murata GRM188R60JA106ME47 10µF, 6.3V, X5R

C2 Murata GRM188R60JA106ME47 10µF, 6.3V, X5R

L1 Murata LQH43PN100M26 10µH

VIN VOUTLX OUT

EN GNDC210µF

L1 10µH

C110µF

AME

9

AME5177

Rev. A.01


Efficiency vs. Output Current

CCM Output Voltage Ripple

Quiescent Current vs. Temperature

n Characterization Curve

DCM Output Voltage Ripple

Output Voltage vs. Temperature

Power ON from Input Voltage

Output Current (A)

Effi

cien

cy (%

)

2.0µs/Div

C2

C4

VOUT(20mV/Div)

C3

IL(50mA/Div)

0.0

10.0

20.0

30.0

40.0

50.0

60.0

70.0

80.0

90.0

100.0

0.00010 0.00100 0.01000 0.10000

VIN=1.5V , VOUT=2.7V , L=10µH

2.0µs/Div

C2

C4

VOUT(20mV/Div)

IL(50mA/Div)

2.55

2.60

2.65

2.70

2.75

2.80

-50 -25 0 25 50 75 100 125

VOUT=2.7V

Temperature (oC)

Out

put V

olta

ge (V

)

3

3.5

4

4.5

5

5.5

6

6.5

-50 -25 0 25 50 75 100 125

VOUT=2.1V

Temperature (oC)Q

uies

cent

Cur

rent

(uA

)

2.0ms/Div

C4

C2VOUT

(1V/Div)

IL(100mA/Div)

VIN(1V/Div)

AME

10

AME5177

Rev. A.01


n Tape and Reel Dimension

SOT-25

Carrier Tape, Number of Components Per Reel and Reel Size

SOT-26

Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size

SOT-25 8.0±0.1 mm 4.0±0.1 mm 3000pcs 180±1 mm


W

P

AME AME

PIN 1

PIN 1

W

P

AME AME


SOT-26 8.0±0.1 mm 4.0±0.1 mm 3000pcs 180±1 mm

AME

11

AME5177

Rev. A.01


n Tape and Reel Dimension (Contd.)



W

P

PIN 1

AM

E

AM

E


DFN-6D(2x2x0.75mm) 8.0±0.1 mm 4.0±0.1 mm 3000pcs 180±1 mm

AME

12

AME5177

Rev. A.01


n Package Dimension

SOT-25

MIN MAX MIN MAX

A 0.90 1.30 0.0354 0.0512

A1 0.00 0.15 0.0000 0.0059

b 0.30 0.55 0.0118 0.0217

D 2.70 3.10 0.1063 0.1220

E 1.40 1.80 0.0551 0.0709

eH 2.60 3.00 0.1024 0.1181

L

θθθθ1 0o 10o 0o 10o

S1 0.95 BSC 0.0374 BSC

SYMBOLSMILLIMETERS INCHES

1.90 BSC 0.0748 BSC

0.37 BSC 0.0146 BSC

n Lead Pattern Drawing

0.70 BSC

1.00

BS

C

0.95 BSC 0.95 BSC

1.90 BSC

2.40

BS

C

Note:

1. Lead pattern unit description:

BSC: Basic. Represents theoretical exact dimension or

dimension target.

2. Dimensions in Millimeters.

3. General tolerance +0.05mm unless otherwise specified.

AME

13

AME5177

Rev. A.01


n Package Dimension (Contd.)

Side View

L

Top View

S1

De

EH

Front View

b

AA

1

PIN 1

SOT-26

TOP VIEW BOTTOM VIEW

REAR VIEW

eD

E

A GG1

b L

E1

D1

PIN 1 IDENTIFICATION


MIN MAX MIN MAXA 0.700 0.800 0.028 0.031

D 1.900 2.100 0.075 0.083

E 1.900 2.100 0.075 0.083

eD1 1.100 1.650 0.043 0.065

E1 0.600 1.050 0.024 0.041

b 0.180 0.350 0.007 0.014

L 0.200 0.450 0.008 0.018

G 0.178 0.228 0.007 0.009

G1 0.000 0.050 0.000 0.002

SYMBOLSMILLIMETERS INCHES

0.650 TYP 0.026 TYP

Life Support Policy:These products of AME, Inc. are not authorized for use as critical components in life-support

devices or systems, without the express written approval of the presidentof AME, Inc.

AME, Inc. reserves the right to make changes in the circuitry and specifications of its devices andadvises its customers to obtain the latest version of relevant information.

AME, Inc. , June 2013Document: A015A-DS5177-A.01

Corporate HeadquarterAME, Inc.8F, 12, WenHu St., Nei-HuTaipei 114, Taiwan .Tel: 886 2 2627-8687Fax: 886 2 2659-2989

www.ame.com.twE-Mail: [email protected]

ame synchronous boost converter with low quie scent current · 2013-09-10 · ame 1 ame5177 rev....

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