Diodes AP5101 User Manual
Ap5101, New prod uc t description, Pin assignments
AP5101
1.5A Step-Down Converter with 1.4MHz Switching
Frequency
AP5101
Document number: DS32258 Rev. 1 - 2
1 of 15
July 2010
© Diodes Incorporated
NEW PROD
UC
T
Description
The AP5101 is a current mode step-down converter with a
built-in power MOSFET to enable smallest solution size
power conversion.
With the low series resistance power switch it enables a
constant output current of up to 1.5A over a wide input supply
range. The load and line regulation has excellent response
time over the operating input voltage and temperature range.
The AP5101 is self protected, through a cycle-by-cycle
current limiting algorithm and an on chip thermal protection.
The AP5101 will provide the voltage conversion with a low
count of widely available standard external components.
The AP5101 is available in SO-8 package.
Pin Assignments
SO-8
( Top View )
1
2
3
4
8
7
6
5
GND
BST
FB
COMP
SW
GND
EN
IN
Features
• V
IN
4.75 to 22V
• 1.5A Peak Output Current
• Stable with Low ESR Ceramic Output Capacitors
• External
compensation
• Up to 92% Efficiency
• 0.1µA Shutdown Mode
• Fixed
1.4MHz
Frequency
• Thermal
Shutdown
• Cycle-by-Cycle Over Current Protection
• Output Adjustable from 0.81V to 15V
• SO-8: Available in “Green” Molding Compound
(No Br, Sb)
• Lead Free Finish/ RoHS Compliant (Note 1)
Applications
• Distributed Power Systems
• Battery
Charger
• Pre-Regulator for Linear Regulators
• WLED
Driver
Note: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at
Typical Application Circuit
1
7
2
6
4,8
5
3
IN
EN
GND
COMP
FB
SW
BST
AP5101
Output
3.3V 1.5A
C2
C3
R3
R2
C4
L1
Input
4.75V to 22V
R1
C1
ON
OFF
D1
Figure 1 Typical Application Circuit