ZLED7022 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

D5

D1

D2

D4

D3

Data Processor

Cout

2.2

μF

<D1:D5> Drivers

Vcon

M1

R1

Iout

A

+

-

C

+

ZLED7022

GND

Figure 1.5

2

Circuit Description

2.1.

Block diagram

2.2.

ZLED7022 Overview

The ZLED7022 is a low-noise, constant-frequency charge pump DC/DC converter for driving up to six 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 ZLED7022’s current sinks can operate in parallel for driving higher current LEDs. Only a few, small

external components are needed for typical applications. The ZLED7022’s charge pump operates at a fixed frequency (1MHz

typical) with minimal noise and harmonics.