AME, Inc.
1
AME5131
Low Power
DC/DC Boost Converter
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0.6
Internal Switch
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1.8V to 5.5V Input Range
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Adjustable Output Voltage Up to 28V
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Input Under Voltage Protection
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32
A Typical No Load Quiescent Current
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1
A Shutdown Current
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SOT-25 Package
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All AME's Lead Free Products Meet RoHS
Standards
The AME5131 is a high-frequency boost converter dedi-
cated for LCD bias supply and white LED applications for
cellular phone backlighting, PDAs, and other hand-held
devices. The part can also be used to generate standard
3.3 V/5 V to 12 V power conversions.
The AME5131 has an internal 400mA switch current
limit, offering lower output voltage ripple. The 32
A low
quiescent current together with an optimized control
scheme, allows device operation at high efficiencies and
maintains long battery lifetime. AME5131 uses SOT-25
package and gives a small size solution.
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White LED Back-Lighting
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Hand-held Devices
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Digital Cameras
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Portable Applications
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Internet Audio Player
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LCD Bias Power
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Standard 3.3 V/5 V to 12 V Conversions
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General Description
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Features
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Applications
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Typical Application
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Function Block Diagram
Driver
SW
GND
Boost
Controller
UVP
Soft Start
On / Off Time
Controller
Bandgap
FB
V
IN
Enable
EN
+
_
+
_
FB
EN
SW
GND
C
O
1
F
L1
10
H
C
FF
22PF
C
IN
4.7
F
V
IN
V
IN
1.8 V-5.5 V
1
3
2
4
5
R1
2.1M
R2
150K
D1
AME5131
V
IN
~28 V
V
OUT
AME, Inc.
2
Low Power
DC/DC Boost Converter
AME5131
Pin Number
Pin Name
Pin Description
1
SW
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.
2
GND
Ground Pin.
3
FB
Feedback Input Pin.
Connect this pin to the external voltage divider to program the desired
output voltage.
4
EN
Enable Control Input Pin. (Active High)
Input Supply Pin.
Place bypass capacitor as close to V
IN
as possible.
5
V
IN
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Pin Configuration
SOT-25
Top View
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Pin Description
1
3
AME5131
5
4
2
AME5131AEEV
1. SW
2. GND
3. FB
4. EN
5. V
IN
* Die Attach:
Conductive Epoxy
AME, Inc.
3
AME5131
Low Power
DC/DC Boost Converter
A
1. SW
E: -40
O
C to +85
O
C
E: SOT-2X
V: 5
ADJ: Adjustable
Z: Lead free
(SOT-25)
2. GND
3. FB
4. EN
5. V
IN
Output Voltage
Special Feature
Pin
Configuration
Operating Ambient
Temperature Range
Package Type
Number
of
Pins
Operating Ambient Temperature Range
Number of Pins
Package Type
Pin Configuration
Special Feature
AME5131 x x x
x
xxx x
Output Voltage
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Ordering Information
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Ordering Information
Part Number
Marking*
Output Voltage Package
Operating Ambient
Temperture Range
AME5131AEEVADJZ
BEFww
ADJ
SOT-25
-40
O
C to
+
85
O
C
Note: ww represents the date code and pls refer to Date Code Rule page on Package Dimension.
* A line on top of the first letter represents lead free plating such as BEFww.
Please consult AME sales office or authorized Rep./Distributor for the availability of package type.
AME, Inc.
4
Low Power
DC/DC Boost Converter
AME5131
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Absolute Maximum Ratings
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Recommended Operating Conditions
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Thermal Information
Caution: Stree above the listed absolute maximum rating may cause permanent damage to the device.
HBM C: 4000V+
Parameter
Symbol
Rating
Unit
Ambient Temperature Range
T
A
-40 to +85
Junction Temperature Range
T
J
-40 to +125
O
C
Parameter
Package
Die Attach
Symbol
Maximum
Unit
Thermal Resistance*
(Junction to Case)
JC
81
o
C / W
Thermal Resistance
(Junction to Ambient)
JA
260
o
C / W
Internal Power Dissipation
P
D
400
mW
150
o
C
350
o
C
Solder Iron (10 Sec)**
Maximum Junction Temperature
SOT-25
Conductive Epoxy
* Measure
JC
on center of molding compound if IC has no tab.
** MIL-STD-202G210F
Parameter
Symbol
Maximum
Unit
Input Supply Voltage
V
IN
6
EN, FB Voltages
V
EN
, V
FB
V
IN
SW Voltage
V
SW
30
ESD Classification
V
C*
AME, Inc.
5
AME5131
Low Power
DC/DC Boost Converter
n
Electrical Specifications
V
IN
= 2.4V, EN = V
IN
, T
A
= -40
o
C to 85
o
C, typical values are at T
A
= 25
o
C
Parameter
Symbol
Min
Typ
Max
Units
Input Voltage
V
IN
1.8
5.5
V
Quiescent Current
I
Q
32
50
Shutdown Current
I
SD
0.1
1
FB Pin Bias Current
I
FB
1
Feedback Trip Point
V
FB
1.187
1.212 1.237
V
UVP Voltage
UVP
1.5
1.7
V
Switch Current Limit
I
CL
350
400
450
mA
Switch R
DSON
R
DSON
0.6
1
SW leakage current
I
SW
1
10
A
Switch Off Time
t
OFF
400
ns
Switch On Time
t
ON
6
s
EN Input Current
I
EN
0.1
1
A
EN Input Threshold (High)
V
EH
1.3
V
EN Input Threshold (Low)
V
EL
0.4
V
Line Regulation
REG
LINE
0.3
%/V
Load Regulation
REG
LOAD
0.15
%/mA
A
V
SW
= 28V
Device Active
I
OUT
= 0mA, not switching, V
FB
= 1.3V
V
OUT
= 18V, I
OUT
= 10mA, T
A
=25
o
C
V
IN
= 2.4V; I
SW
= 200mA
Test Condition
EN = GND
V
FB
= 1.3V
1.8V
V
IN
5.5V
1.8
V
IN
5.5V; V
OUT
=18V;
I
LOAD
=10mA; Cff = not connected
V
IN
=2.4V; V
OUT
=18V;
0mA
I
OUT
30mA
Device Shutdown
EN = GND or V
IN
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