Diodes AP3591 User Manual download pdf

AP3591

Document number: DS36906 Rev. 1 - 2

1 of 18

www.diodes.com

March 2014

AP3591

NEW PROD UCT

A Product Line of

Diodes Incorporated

SINGLE PHASE SYNCHRONOUS BUCK CONTROLLER

Description

The AP3591 is a synchronous adaptive on-time buck controller

providing high efficiency, excellent transient response and high DC

output accuracy for low voltage regulation in notebook application.

The constant-on-time PWM control scheme handles wide input/output

voltage ratios with ease and features small external component count

and fast transient response.

The operation mode is selectable by EN voltage. A Diode Emulation

Mode (DEM) is activated for increasing efficiency at light loads, while

PWM mode is activated only for low noise operation. The AP3591

also integrates internal Soft-start, UVLO, OVP, OTP, and

programmable OCP to protect the circuit. A Power Good signal is

employed to monitor the output voltage.

The AP3591 is available in U-QFN3535-14 package.

Features

 Fixed Frequency Constant On-time Control; Resistor

Programmable Frequency Adjustable from 100kHz to 700kHz

 Good Stability Independent of the Output Capacitor ESR

 Quick Load Step Response

 Input Voltage Range: 4.5V to 26V

 Output Voltage Range: 0.75V to 5.5V

 CCM/DEM Mode Selection

 Integrated Bootstrap Diode

 Resistor Programmable Current Limit by Low-side R

DS_ON

Sense

 Integrated Negative Over Current Limit

 Integrated OVP/UVP and Over Thermal Shutdown Function

 Power Good Indicator

 Internal Soft-start

 Integrate Output Discharge (Soft-stop)

 Safe Start-up into Pre-biased Loads

 Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)

 Halogen and Antimony Free. “Green” Device (Note 3)

Pin Assignments

(Top View)

U-QFN3535-14

Applications

 Notebook Computer, AIO PC

 Low-voltage Distribute Power

 I/O Supplies

Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.

2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"

and Lead-free.

3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and

<1000ppm antimony compounds.

VOUT

VDD

PGOOD

GND

PGND

LGATE

EN/DEM

TON

BOOT

UGATE

PHASE

VDDP

Pin 1 Mark

1 14

7 8

1 2 3 4 5 6 ... 17 18

Summary of Contents

Page 1 - Pin 1 Mark

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Page 6 - Electrical Characteristics (V

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Page 8 - Efficiency (%)

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Page 9 - Shutdown Current vs. V

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Page 10

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Page 11 - Application Information

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