ZLED7012 Datasheet

© 2016 Integrated Device Technology, Inc.

8

April 20, 2016

Charge Pump

Cpump

1µF

C

-

VCC

S1

S3

S4

S2

Vout

EN/SET

R2

Iref <1:14>

S<1:14>

D0 Driver

SD

EN_CP

Vref

D0

D1

D2

D3

Data Processor

Cout

2.2

μF

<D1:D3> Drivers

Vcon

M1

R1

Iout

A

+

-

C

+

ZLED7012

GND

Figure 1.5

Efficiency (%) over the VCC Range (2.8V to 5.5V) at 25°C

2

Circuit Description

2.1.

Block Diagram

2.2.

ZLED7012 Overview

The ZLED7012 is a low-noise, constant-frequency charge pump DC/DC converter for driving up to four LEDs with constant current

at a level controlled via a PCC serial digital interface, providing a uniform and linear brightness progression. Its 20mA (maximum)

current output per LED channel is optimal for low-voltage or battery-powered applications, such as portable applications powered

by 1-cell lithium batteries. The ZLED7012’s current sinks can operate in parallel for driving higher current LEDs. Only a few, small

external components are needed for typical applications. The ZLED7012’s charge pump operates at a fixed frequency (1MHz

typical) with minimal noise and harmonics.