AAT3167_07 ANALOGICTECH [Advanced Analogic Technologies], AAT3167_07 Datasheet

AAT3167_07

Manufacturer Part Number

AAT3167_07

Description

High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications

Manufacturer

ANALOGICTECH [Advanced Analogic Technologies]

Datasheet

1.AAT3167_07.pdf (14 pages)

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General Description

The AAT3167 is a low noise, constant frequency

charge pump DC/DC converter that uses a tri-

mode load switch (1X), fractional (1.5X), and dou-

bling (2X) conversion to maximize efficiency for

white LED applications. The AAT3167 is capable of

driving five LEDs for a total of 135mA from a 2.7V

to 5.5V input. The current sinks may be operated

individually or in parallel for driving higher current

LEDs. A low external parts count (two 1µF flying

capacitors and two small 1µF capacitors at IN and

OUTCP) make this part ideally suited for small,

battery-powered applications.

AnalogicTech's AS

Serial Control™) serial digital input is used to enable,

disable, and set current for each LED with a 16-level

logarithmic scale plus four low-current settings down

to 115µA. For optimized efficiency, low-current set-

tings require only 50µA of housekeeping current.

Each output of the AAT3167 is equipped with built-

in protection for output short circuit and auto-dis-

able for load short-circuit conditions. Built-in soft-

start circuitry prevents excessive inrush current

during start-up. A low-current shutdown feature dis-

connects the load from the input and reduces qui-

escent current to less than 1µA.

The AAT3167 is available in a Pb-free, space-sav-

ing, thermally-enhanced, 14-pin 3x3mm STDFN or

16-pin 4x4mm QFN package and is rated over the

-40°C to +85°C temperature range.

Typical Application

3167.2007.03.1.4

2.7V to 5.5V

Cwire™ (Advanced Simple

EN/SET

1µF

GND

C1+

C1-

EN/SET

AAT3167

OUTCP

C2+

C2-

1µF

High Efficiency 1X/1.5X/2X Charge

Pump for White LED Applications

Features

•

Applications

•

Fully Programmable Current with Single Wire

— 16-Step Logarithmic Scale

— 14/18/27mA Max Current

— Four Low-Current Settings Down to 115µA

— Low I

Tri-Mode 1X, 1.5X, 2X Charge Pump for

Maximum Efficiency and V

Drives Up to Five LEDs

Individual Main-Sub (4-1) Group Control

No Inductors, Low Noise Operation

1MHz Constant Switching Frequency

Small Application Circuit

Built-In Thermal Protection

Built-In Auto-Disable for Open Circuit

Automatic Soft Start

STDFN33-14 or QFN44-16 Package

Color (RGB) Lighting

Programmable Current Sink

Transmissive LCD Display

White LED Backlighting

White Photo Flash for Digital Still Cameras

<1µA in Shutdown

Range: 2.7V to 5.5V

Current Mode

(50µA) for Single-Channel, Low-

ChargePump

1µF

OUT

Coverage

™

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AAT3167_07 Summary of contents

Page 1

General Description The AAT3167 is a low noise, constant frequency charge pump DC/DC converter that uses a tri- mode load switch (1X), fractional (1.5X), and dou- bling (2X) conversion to maximize efficiency for white LED applications. The AAT3167 is capable ...

Page 2

Pin Descriptions Pin # Symbol AAT3167ISN AAT3167IFO 1, 3 n/a N EN/SET 4 6 OUTCP GND ...

Page 3

Absolute Maximum Ratings Symbol Description V Input Voltage to GND IN V EN/SET Voltage to GND EN/SET I Maximum DC Output Current 2 OUT T Operating Junction Temperature Range J T Maximum Soldering Temperature (at leads, 10 sec) LEAD Thermal ...

Page 4

Electrical Characteristics 1.0µ OUT 3.6V. IN Symbol Description Input Power Supply V Operation Range IN I Operating Current CC I Shutdown Current SHDN High Current Accuracy ...

Page 5

Typical Characteristics 1.0µ OUT Efficiency vs. Supply Voltage 100 5.1mA 3. 350μ 2.7V F ...

Page 6

Typical Characteristics 1.0µ OUT Load Characteristics (V = 3.9V; 1.5X Mode; 18mA Load (40mV/div) CP (40mV/div) V SINK (40mV/div) Time (500ns/div) Load Characteristics (V ...

Page 7

Typical Characteristics 1.0µ OUT vs. V LAT IN 350 300 -40°C 250 200 150 25°C 100 50 0 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 ...

Page 8

Functional Block Diagram IN EN/SET Functional Description The AAT3167 is a tri-mode load switch (1X) and high efficiency (1.5X or 2X) charge pump device intended for white LED backlight applications. To maximize power conversion efficiency, an internal sensing circuit monitors ...

Page 9

LED being driven. Since the input current sinks of the AAT3167 are programmable, no PWM (pulse width modulation) ...

Page 10

Max Current register (Register 3) is set to the Low Current setting, the Low Current register (Register 4) must be programmed. The two most significant bits of the Low Current register control whether or not a given bank of ...

Page 11

AS Cwire Serial Interface Timing 2 EN/SET 1 Address Data Reg 1 Data Reg 2 Applications Information LED Selection Although the AAT3167 is designed for driving white LEDs, the device also can be used to drive most types of LEDs ...

Page 12

Capacitor Characteristics Ceramic composition capacitors are highly recom- mended over all other types of capacitors for use with the AAT3167. Ceramic capacitors offer many advantages over their tantalum and aluminum elec- trolytic counterparts. A ceramic capacitor typically has very low ...

Page 13

Ordering Information Package STDFN33-14 QFN44-16 All AnalogicTech products are offered in Pb-free packaging. The term “Pb-free” means semiconductor products that are in compliance with current RoHS standards, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. ...

Page 14

Pin 1 Dot By Marking 4.000 ± 0.050 Top View All dimensions in millimeters. © Advanced Analogic Technologies, Inc. AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech product. No circuit patent ...

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