AME, Inc.
AME5131
n
General Description
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 32µA 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.
Low Power
DC/DC Boost Converter
n
Function Block Diagram
On / Off Time
Controller
UVP
V
IN
SW
_
FB
+
Boost
Controller
Driver
Bandgap
+
_
GND
Soft Start
Enable
EN
n
Features
l
0.6Ω Internal Switch
l
1.8V to 5.5V Input Range
l
Adjustable Output Voltage Up to 28V
l
Input Under Voltage Protection
l
32µA Typical No Load Quiescent Current
l
1µA Shutdown Current
l
SOT-25 Package
l
All AME's Lead Free Products Meet RoHS
Standards
C
IN
4.7μF
4
EN
V
IN
1.8 V-5.5 V
5 V
IN
1
R1
2.1M
C
FF
22PF
n
Typical Application
L1
10μH
D1
V
OUT
V
IN
~28 V
SW
AME5131
FB
GND
3
2
R2
150K
C
O
1μF
n
Applications
l
White LED Back-Lighting
l
Hand-held Devices
l
Digital Cameras
l
Portable Applications
l
Internet Audio Player
l
LCD Bias Power
l
Standard 3.3 V/5 V to 12 V Conversions
1
AME, Inc.
AME5131
n
Pin Configuration
SOT-25
Top View
5
4
Low Power
DC/DC Boost Converter
AME5131AEEV
1. SW
2. GND
AME5131
3. FB
4. EN
5. V
IN
* Die Attach:
Conductive Epoxy
1
2
3
n
Pin Description
Pin Number
1
2
3
4
5
Pin Name
SW
GND
FB
EN
V
IN
Pin Description
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.
Ground Pin.
Feedback Input Pin.
Connect this pin to the external voltage divider to program the desired
output voltage.
Enable Control Input Pin. (Active High)
Input Supply Pin.
Place bypass capacitor as close to V
IN
as possible.
2
AME, Inc.
AME5131
n
Ordering Information
AME5131 x x x x xxx x
Special Feature
Output Voltage
Number of Pins
Package Type
Operating Ambient Temperature Range
Pin Configuration
Low Power
DC/DC Boost Converter
Pin
Configuration
A
(SOT-25)
Operating Ambient
Package Type
Temperature Range
E: -40
O
C to +85
O
C
E: SOT-2X
Number
of
Pins
V: 5
Output Voltage
Special Feature
1. SW
2. GND
3. FB
4. EN
5. V
IN
ADJ: Adjustable
Z:
Lead free
n
Ordering Information
Part Number
AME5131AEEVADJZ
Marking*
BEFww
Output Voltage
ADJ
Package
SOT-25
Operating Ambient
Temperture Range
-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.
3
AME, Inc.
AME5131
n
Absolute Maximum Ratings
Parameter
Input Supply Voltage
EN, FB Voltages
SW Voltage
ESD Classification
Low Power
DC/DC Boost Converter
Symbol
V
IN
V
EN
, V
FB
V
SW
Maximum
6
V
IN
30
C*
Unit
V
Caution: Stree above the listed absolute maximum rating may cause permanent damage to the device.
HBM C: 4000V+
n
Recommended Operating Conditions
Parameter
Ambient Temperature Range
Junction Temperature Range
Symbol
T
A
T
J
Rating
-40 to +85
-40 to +125
Unit
O
C
n
Thermal Information
Parameter
Thermal Resistance*
(Junction to Case)
Thermal Resistance
(Junction to Ambient)
Internal Power Dissipation
Maximum Junction Temperature
Solder Iron (10 Sec)**
SOT-25
Conductive Epoxy
Package
Die Attach
Symbol
θ
JC
θ
JA
P
D
Maximum
81
Unit
o
C/W
260
o
C/W
mW
o
400
150
350
C
C
o
* Measure
θ
JC
on center of molding compound if IC has no tab.
** MIL-STD-202G210F
4
AME, Inc.
AME5131
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
Input Voltage
Quiescent Current
Shutdown Current
FB Pin Bias Current
Feedback Trip Point
UVP Voltage
Switch Current Limit
Switch R
DSON
SW leakage current
Switch Off Time
Switch On Time
EN Input Current
EN Input Threshold (High)
EN Input Threshold (Low)
Line Regulation
Load Regulation
Symbol
V
IN
I
Q
I
SD
I
FB
V
FB
UVP
I
CL
R
DSON
I
SW
t
OFF
t
ON
I
EN
V
EH
V
EL
REG
LINE
REG
LOAD
EN = GND or V
IN
Device Active
Device Shutdown
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
0.3
0.15
1.3
0.4
V
OUT
= 18V, I
OUT
= 10mA, T
A
=25
o
C
V
IN
= 2.4V; I
SW
= 200mA
V
SW
= 28V
350
I
OUT
= 0mA, not switching, V
FB
= 1.3V
EN = GND
V
FB
= 1.3V
1.8V
≦
V
IN
≦
5.5V
1.187
Test Condition
Min
1.8
32
0.1
Typ
Max
5.5
50
1
1
1.212 1.237
1.5
400
0.6
1
400
6
0.1
1
1.7
450
1
10
V
V
mA
Ω
µA
ns
µs
µA
V
V
%/V
%/mA
µA
Units
V
Low Power
DC/DC Boost Converter
5
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