AME, Inc.
AME5107
n
General Description
AME5107provides low-ripple power, high efficiency, and
excellent transient characteristics. The PWM control cir-
cuit is able to vary the duty ratio linearly from 0 up to
100%. This converter also contains an error amplifier cir-
cuit as well as a soft-start circuit that prevents overshoot
at startup. An enable function, an over current protect func-
tion and a short circuit protect function are built inside,
and when OCP or SCP happens, the operation frequency
will be reduced from 350KHz to 30KHz. Also, an internal
compensation block is built in to minimum external com-
ponent count.
With the addition of an internal P-channel Power MOS,
a coil, capacitors, and a diode connected externally, these
ICs can function as step-down switching regulators. They
serve as ideal power supply units for portable devices when
coupled with the SOP-8L mini-package, providing such
outstanding features as low current consumption. Since
this converter can accommodate an input voltage up to
18V, it is also suitable for the operation via an AC adapter.
PWM Control 3A Buck
Converter
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Applications
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PC Motherboard
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LCD Monitor
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Graphic Card
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DVD-Video Player
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Telecom Equipment
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ADSL Modem
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Printer and other Peripheral Equipment
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Microprocessor core supply
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Networking power supply
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Features
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Input voltage: 3.6V to 18V.
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Output voltage: 0.8V to VCC.
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Duty ratio: 0% to 100% PWM control
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Oscillation frequency: 350KHz typ.
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Soft-start, Current limit, Enable function
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Thermal Shutdown function
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Built-in internal SW P-channel MOS
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SOP-8 Package
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All AME’ s Lead Free Products Meet RoHS
Standards
S
C
Rev.A.01
1
AME, Inc.
AME5107
n
Pin Configuration
SOP-8
Top View
8
7
6
5
PWM Control 3A Buck
Converter
AME5107
1. FB
2. EN
3. OCSET
4. IN
5. SW
6. SW
AME5107
1
2
3
4
7. GND
8. GND
* Die Attach:
Conductive Epoxy
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Pin Description
Pin Number
Pin Name
Pin Description
Output voltage Feedback input.
Set the output
C
voltage by selecting values for Ra and Rb using:
1
FB
Ra
+
Rb
V
OUT
=
0 .8
V
Rb
Connect the ground of the feedback network to an AGND (Analog
Ground) plane which should be tied directly to the GND pin.
Enable Control Input, active high.
The enable pin is an active high control. Tie this pin above 2V to enable
the device. Tie this pin below 0.8V to shut down the device. In shutdown,
all function are disabled. Do not leave EN pin floating.
Add an external resistor to set max output current.
Input Supply Voltage Pin.
Bypass this pin with a capacitor. The capacitor shall be placed as close
to the device as possible.
Switch Node Connection to Inductor.
Ground.
Tie directly to ground plane.
2
EN
3
4
5,6
7,8
OCSET
IN
SW
GND
Rev.A.01
3
AME, Inc.
AME5107
n
Absolute Maximum Ratings
Parameter
Input Supply Voltage
EN,SW Pin Voltages
FB Pin Voltage
ESD Classification
PWM Control 3A Buck
Converter
Symbol
IN
V
EN
, V
SW
V
FB
Maximum
-0.3V to 22V
-0.3V to 0.3V
-0.3V to V
IN
TBD*
Unit
V
Caution: Stree above the listed absolute maximum rating may cause permanent damage to the device.
*HBM B: 2000~3999V
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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
-20 to 85
-20 to 125
-40 to 150
Unit
o
C
C
C
o
o
C
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Thermal Information
Parameter
Thermal Resistance*
(Junction to Case)
Thermal Resistance
(Junction to Ambient)
Internal Power Dissipation
Solder Iron (10 Sec)**
Package
SOP-8
Die Attach
Symbol
θ
JC
θ
JA
P
D
Maximum
60
Unit
o
C/W
SOP-8
Conductive Epoxy
150
SOP-8
810
350
mW
o
C
* Measure
θ
JC
on center of molding compound if IC has no tab.
** MIL-STD-202G-210F
Rev.A.01
5
Embedded System
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