AP5100

1.2A Step-Down Converter with 1.4MHz Switching

Frequency

AP5100

1 of 12

MARCH 2010

Document number: DS32130 Rev. 1 - 2

www.diodes.com

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Load current of up to 1.2A

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Internal Power MOSFET

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Stable with Low ESR Ceramic Output Capacitors

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Up to 90% Efficiency

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0.1µA Shutdown Mode

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Fixed 1.4MHz Frequency

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Thermal Shutdown

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Cycle-by-Cycle Over Current Protection

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Resistor divider adjustable Output: 0.81V to 15V

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SOT26: Available in “Green” Molding Compound

(no Br, Sb)

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Lead Free Finish/RoHS Compliant (Note 1)

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.

Applications

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Distributed Power Systems

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Battery Charger

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Pre-Regulator for Linear Regulators

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WLED Drivers

Typical Applications

BST

SW

FB

IN

EN

C2

AP5100

R1

R2

D1

GND

C3

.L1

C1

ON

OFF

C6

5

4

1

6

3

Figure 1.

Typical Application Circuit

Features

General Description