AME, Inc.
AME5172
n
General Description
The AME5172 is a high-efficiency, current mode, syn-
chronous 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 0.35Ω NMOS switch and 0.45Ω PMOS syn-
chronous rectification significantly improves efficiency and
reduces external components count. High switching fre-
quency (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
4.7µH
V
IN
C
IN
4.7µF
1
5
V
OUT
3.3V
up to 200mA
C
OUT
4.7µF
IN
SW
AME5172
OUT
OFF ON
3
EN
GND
4
2
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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, 0.35Ω Power MOSFET
l
1µA Shutdown Current
l
True Shutdown
l
SOT-25 Package
l
All AME's Lead Free Products Meet RoHS
Standards
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Applications
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Hand-held Devices
l
Digital Cameras
l
Portable Applications
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MP3 Players
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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
V
OUT
Good
2.3V
OUT
Erroramp
Σ
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
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Pin Description
Pin Number
1
2
3
Pin Name
IN
GND
EN
Pin Description
Input Supply Pin.
Place bypass capacitor as close to V
IN
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: -40
O
C to 85
O
C
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
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Ordering Information
Part Number
AME5172AEEV330Z
Marking*
BTWww
Output Voltage
3.3V
Package
SOT-25
Operating Ambient
Temperature Range
-40
O
C to 85
O
C
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
V
EN
,V
OUT
V
SW
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.
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Recommended Operating Conditions
Parameter
Ambient Temperature Range
Junction Temperature Range
Storage Temperature Range
Symbol
T
A
T
J
T
STG
Rating
-40 to 85
-40 to 125
-65 to 150
Unit
o
C
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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
θ
J
C
θ
JA
P
D
Maximum
81
Unit
o
C/W
260
400
350
mW
o
C
* Measure
θ
JC
on backside center of molding compund if IC has no tab.
** MIL-STD-202G 210F
Rev. A.02
5
嵌入式系统
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