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AME, Inc.
AME5172
n General Description
The AME5172 is a high-efficiency, current mode, synchronous PWM Boost DC-DC Converter with fixed 3.3V output voltage for system applications powered by single or double cell NiMH or Alkaline battery pack. Built-in 0.35 NMOS switch and 0.45 PMOS synchronous rectification significantly improves efficiency and reduces external components count. High switching frequency (at 1.2MHz) allows easy filtering and faster loop performance. AME5172 uses SOT-25 package that gives a small size solution.
0.85V Single Cell Boost DC-DC Converter
n Typical Application
L1 4.7H VIN CIN 4.7F 1 5
VOUT 3.3V up to 200mA COUT 4.7F
IN
SW
AME5172 OUT OFF ON 3 EN GND 4 2
n Features
l PWM Control with 1.2MHz Fixed Frequency l Up to 92% Efficiency l 0.85V Low Start-up Input Voltage l Internal Synchronous Rectifier l Fixed 3.3V Output Voltage Options l 0.8A, 0.35 Power MOSFET l 1A Shutdown Current l True Shutdown l SOT-25 Package l All AME's Lead Free Products Meet RoHS Standards
n Applications
l Hand-held Devices l Digital Cameras l Portable Applications l MP3 Players l LCD Bias Power l Wireless Handsets
Rev. A.02
1
AME, Inc.
AME5172
n Function Block Diagram
0.85V Single Cell Boost DC-DC Converter
IN
EN
SW
Enable Bandgap
Start-UP OSC
VOUT Good 2.3V OUT
Erroramp
OSC Ramp
PWM COMP
PWM Control
SYNC Driver
Current Limit COMP Current sense
GND
2
Rev. A.02
AME, Inc.
AME5172
n Pin Configuration
SOT-25 Top View
5 4
0.85V Single Cell Boost DC-DC Converter
AME5172AEEV 1. IN 2. GND
AME5172
3. EN 4. OUT 5. SW
1
2
3
* Die Attach: Conductive Epoxy
n Pin Description
Pin Number
1 2 3
Pin Name
IN GND EN
Pin Description
Input Supply Pin. Place bypass capacitor as close to VIN as possible. Ground connection Pin. Enable Control Input Pin. (Active High) Power Output Pin. PCB layout from output capacitor should be as short and wide as possible.. This is the switch pin and is connected to the drain of the internal NMOS power switch. Minimize the metal trace area connected to this pin to minimize EMI.
4
OUT
5
SW
Rev. A.02
3
AME, Inc.
AME5172
n Ordering Information AME5172 x x x x xxx x
Special Feature Output Voltage Number of Bumps Package Type Operating Ambient Temperature Range Pin Configuration
0.85V Single Cell Boost DC-DC Converter
Pin Configuration A
(SOT-25)
Operating Ambient Temperature Range E: -40OC to 85OC
Package Type
Number of Pins V: 5
Output Voltage
Special Feature
1. IN 2. GND 3. EN 4. OUT 5. SW
E: SOT-2x
330: 3.3V
Z:
Lead free
n Ordering Information
Part Number
AME5172AEEV330Z
Marking*
BTWww
Output Voltage
3.3V
Package
SOT-25
Operating Ambient Temperature Range
-40OC to 85OC
Note: ww represents the date code and pls refer to Date Code Rule on Package Dimension. * A line on top of the first letter represents lead free plating such as BTW. Please consult AME sales office or authorized Rep./Distributor for the availability of package type.
4
Rev. A.02
AME, Inc.
AME5172
n Absolute Maximum Ratings
Parameter
Input Voltage EN, Output Voltages Switch Voltage ESD Classification
0.85V Single Cell Boost DC-DC Converter
Symbol
V IN VEN ,VOUT VSW
Maximum
-0.3 to 6 -0.3 to 6 -0.3 to 6 B*
Unit
V V V
Caution: Stress above the listed absolute maximum rating may cause permanent damage to the device. * HBM B:2000V~3999V exclude SW pin.
n Recommended Operating Conditions
Parameter
Ambient Temperature Range Junction Temperature Range Storage Temperature Range
Symbol
TA TJ TSTG
Rating
-40 to 85 -40 to 125 -65 to 150
Unit
o
C
n Thermal Information
Parameter
Thermal Resistance* (Junction to Case) Thermal Resistance (Junction to Ambient) Internal Power Dissipation Solder Iron (10Sec)** SOT-25 Conductive Epoxy
Package
Die Attach
Symbol
JC JA
PD
Maximum
81
Unit
o
C/W
260
400 350
mW
o
C
* Measure JC on backside center of molding compund if IC has no tab. ** MIL-STD-202G 210F
Rev. A.02
5
AME, Inc.
AME5172
n Electrical Specifications
VIN = 1.2 V, EN = VIN, VOUT=3.3V, TA = 25OC unless otherwise noted.
Parameter Input Voltage Output Voltage Minimum Start-Up Voltage Quiescent Current Shutdown Current NMOS Switch Current Limit NMOS Switch RDSON PMOS Switch RDSON Switching Frequency Maximum Duty Cycle EN Input Current N/PMOS Leakage Current EN Input Threshold (High) (Enable the device) EN Input Threshold (Low) (Shutdown) Symbol V IN V OUT V ST IQ ISD ICL RON,N RON,P VOUT = 3.3V VOUT = 3.3V 0.85 80 EN = GND or VIN VSW = 5V for NMOS, 0V for PMOS 1 ILOAD = 1mA Measured on VOUT EN = GND 600 800 0.35 0.45 1.2 87 1 5 VIN V 0.35 1.5 Test Condition Min 0.85 3.217 3.3 0.85 500 1 A mA MHz % A A Typ Max Note 1 3.383 V Units
0.85V Single Cell Boost DC-DC Converter
fSW
DMAX IEN ISW EN Threshold
Note 1: VIN6
Rev. A.02
AME, Inc.
AME5172
n Detailed Description
The AME5172 is a fixed frequency synchronous boost converter in SOT-25 package. The feature include current mode PWM control with internal frequency compensation, low RDS(ON) MOSFET switch, synchronous rectification and 800mA peak switching current limit.
0.85V Single Cell Boost DC-DC Converter
n Application Information
Inductor Selection An inductor value of 4.7H performs well in most application. Larger values of inductance can reduce the inductor ripple current. Choosing inductors with low ESR decrease power loss and increase efficiency. The approximate output current capability versus inductance value is given in the equation below:
Synchronous Rectification Built-in 0.35 NMOS switch and 0.45 PMOS synchronous rectification significantly improves efficiency and eliminates the need for an external Schottky diode. High switching frequency (at 1.2MHz) also allows easy filtering and faster loop performance.
V xD I OUT (max) = (1 - D ) I CL - IN 2 x L x f SW
where:
= efficiency
Low Voltage Start-Up The AME5172 will start-up at typical input voltage of 0.85V. At start-up, switching frequency is determined by the start-up oscillator and start-up current limit. When VOUT exceeds 2.3V, the start-up circuit will disabled and the PWM mode is initiated.
D=
VOUT - VIN VOUT
ICL=switching peak current limit VIN=input voltage L=inductance value FSW =switching frequency Output Capacitor Selection
Thermal Shutdown Protection The AME5172 has thermal shutdown protection at 160OC (Typ.). If the device temperature rises above 160OC, the internal power MOSFET will turn off. Once the temperature falls below 140OC, the device resumes normal operation. However, device functionality is only guaranteed to a maximum junction temperature of +125OC.
A single ceramic capacitor of value 4.7F to 10F will provide sufficient output capacitance for most applications. Larger capacitance with low ESR can be used to improve ripple and transient response. An output capacitor with excessive ESR can also reduce phase margin and cause instability. In general, if electrolytic are used, it is recommended to parallel with ceramic capacitors to reduce ringing, switching losses, and output voltage ripple. Input Capacitor Selection An input capacitor is required to serve as an energy reservoir for the current which must flow into the coil each time the switch turns ON. This capacitor must have extremely low ESR, so ceramic is the best choice. We recommend a nominal value of 4.7F, but larger values can be used. Since this capacitor reduces the amount of voltage ripple seen at the input pin, it also reduces the amount of EMI passed back to other circuitry.
Rev. A.02
7
AME, Inc.
AME5172
VOUT vs Temperature
3.377 3.357 3.337
0.85V Single Cell Boost DC-DC Converter
Star-up Voltage vs Load Current
1.4
1.3
Start-up Voltage (V)
1.2
VOUT (V)
3.317 3.297 3.277 3.257 3.237 3.217 -40
1.1
1.0
0.9
-20
0
20
Temperature ( C)
40 o
60
80
0.8 0.1
1
10
100
IOUT (mA)
Output Voltage vs Load Current
3.377 3.357 3.337 3.317 VIN = 2.4V VIN = 1.2V VIN = 1.5V
Normalized Frequency vs Temperature
1.40
Frequency (MHz)
1000
1.29
VOUT
3.297 3.277 3.257 3.237 3.217 0.1
1.18
1.07
0.96
1
10
100
0.85 -40
-20
0
20
40
60
80
Load Current (mA)
Temperature (oC)
Efficiency vs Load Current
100 90
Current Limit vs Temperature
900 850
Current Limit (mA)
80
Efficiency (%)
800 750 700 650 600 550 -40
70 60 50 40 30 20 10 0 VIN = 1.2V VIN = 2.4V VIN = 1.5V
1
10
100
1000
-20
0
20
40
60
80
Load Current (mA)
Temperature (oC)
8
Rev. A.02
AME, Inc.
AME5172
SW Pin Operation
0.85V Single Cell Boost DC-DC Converter
VOUT Transient Response
VOUT(AC)
100mV/Div
VSW 1V/Div
IOUT
0V
100mA 40mA
100ns/Div
VIN = 1.3V VOUT = 3.3V IOUT = 10mA L = 6.8H COUT = 4.7F
100ns/Div VIN = 1.3V VOUT = 3.3V IOUT = 40mA to 100mA L = 6.8H COUT = 4.7F
SW Pin Fixed Frequency Continuous Inductor Current Operation
VSW 1V/Div
0V
100ns/Div
VIN = 1.3V VOUT = 3.3V IOUT = 50mA L = 6.8H COUT = 4.7F
Rev. A.02
9
AME, Inc.
AME5172
n Date Code Rule
Marking A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A Date Code W W W W W W W W W W W W W W W W W W W W Year xxx0 xxx1 xxx2 xxx3 xxx4 xxx5 xxx6 xxx7 xxx8 xxx9
0.85V Single Cell Boost DC-DC Converter
n Tape and Reel Dimension
SOT-25
P
W AME PIN 1 AME
Carrier Tape, Number of Components Per Reel and Reel Size
Package SOT-25 Carrier Width (W) 8.00.1 mm Pitch (P) 4.00.1 mm Part Per Full Reel 3000pcs Reel Size 1801 mm
10
Rev. A.02
AME, Inc.
AME5172
n Package Dimension
SOT-25
Top View D
L
0.85V Single Cell Boost DC-DC Converter
Side View
SYMBOLS A A1
MILLIMETERS MIN
0.00 0.30 2.70 1.40
INCHES MIN
0.0000 0.0118 0.1063 0.0551
MAX
0.15 0.55 3.10 1.80
MAX
0.0059 0.0217 0.1220 0.0709
1.20REF
0.0472REF
E
b D E
S1 e c1
H
e H L 1
1.90 BSC 2.60 3.00
0.07480 BSC 0.10236 0.11811 0.0146BSC 0o 10 o
0.37BSC 0o 10 o
Front View
A
S1
0.95BSC
0.0374BSC
b
Rev. A.02
A1
11
www.ame.com.tw
E-Mail: sales@ame.com.tw
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 president of AME, Inc. AME, Inc. reserves the right to make changes in the circuitry and specifications of its devices and advises its customers to obtain the latest version of relevant information. (c) AME, Inc. , September 2007
Document: 1233-DS5172-A.02
Corporate Headquarter
AME, Inc.
2F, 302 Rui-Guang Road, Nei-Hu District Taipei 114, Taiwan. Tel: 886 2 2627-8687 Fax: 886 2 2659-2989
U.S.A. (Subsidiary)
Analog Microelectronics, Inc.
3100 De La Cruz Blvd., Suite 201 Santa Clara, CA. 95054-2438 Tel : (408) 988-2388 Fax: (408) 988-2489

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