AP5100_1011 Datasheet, PDF (1/10 Pages) Diodes Incorporated – 1.2A Step-Down Converter with 1.4MHz Switching Frequency

AP5100
1.2A Step-Down Converter with 1.4MHz Switching
Frequency
Description
Pin Assignments
The AP5100 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 1.2A over a wide input supply
range. The load and line regulation has excellent response
time over the operating input voltage and temperature range.
The AP5100 is self protected, through a cycle-by-cycle
current limiting algorithm and an on chip thermal protection.
The AP5100 will provide the voltage conversion with a low
count of widely available standard external components.
The AP5100 is available in SOT26 package.
( Top View )
BST 1
6 SW
GND ²
5 IN
FB 3
74 EN
SOT26
Features
• V_IN 4.75V to 24V
• Load current of up to 1.2A
• Internal Power MOSFET
• Stable with Low ESR Ceramic Output Capacitors
• Up to 90% Efficiency
• 0.1µA Shutdown Mode
• Fixed 1.4MHz Frequency
• Thermal Shutdown
• Cycle-by-Cycle Over Current Protection
• Resistor divider adjustable Output: 0.81V to 15V
• SOT26: 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 Drivers
Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at
http://www.diodes.com/products/lead_free.html.
Typical Application Circuit
V_IN
C1
ON
OFF
5 _IN
BST ¹
6
SW
AP5100
4 _EN
FB ³
GND
C3
.L1
D1
R1
R2
V_OUT
C6
C2
Figure 1. Efficiency vs. Load Current
AP5100
Document number: DS32130 Rev. 2 - 2
Figure 2. Typical Application Circuit
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November 2010
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