LTC3210EPD-1-PBF LINER [Linear Technology], LTC3210EPD-1-PBF Datasheet

LTC3210EPD-1-PBF

Manufacturer Part Number

LTC3210EPD-1-PBF

Description

Manufacturer

LINER [Linear Technology]

Datasheet

1.LTC3210EPD-1-PBF.pdf (16 pages)

Current page: 1 of 16
Download datasheet (199Kb)

■

APPLICATIONS

TYPICAL APPLICATION

FEATURES

All other trademarks are the property of their respective owners.

Protected by US Patents including 6411531.

■

BAT

Low Noise Charge Pump Provides High Efﬁ ciency

with Automatic Mode Switching

Multimode Operation: 1x, 1.5x, 2x

Individual Full-Scale Current Set Resistors

Up to 500mA Total Output Current

Single Wire EN/Brightness Control for MAIN and

CAM LEDs

64:1 Linear Brightness Control Range for

MAIN Display

Four 25mA Low Dropout MAIN LED Outputs

One 400mA Low Dropout CAM LED Output

Low Noise Constant Frequency Operation

Low Shutdown Current: 3μA

Internal Soft-Start Limits Inrush Current During

Startup and Mode Switching

Open/Short LED Protection

No Inductors

3mm × 3mm 16-Lead Plastic QFN Packages with

0.55mm and 0.75mm Proﬁ les

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

Multi-LED Light Supply for Cellphones/DSCs/PDAs

2.2μF

ENM

ENC

ENM

ENC

BAT

C1P

2.2μF

30.1k

C1M

LTC3210-1

24.3k

C2P

2.2μF

MLED1

MLED2

MLED3

MLED4

CLED

C2M

CPO

GND

2.2μF

MAIN

with 64-Step Brightness Control

32101 TA01

DESCRIPTION

The LTC

verter designed to drive four MAIN LEDs and one high

current CAM LED for camera lighting. The LTC3210-1

requires only four small ceramic capacitors and two cur-

rent set resistors to form a complete LED power supply

and current controller.

Built-in soft-start circuitry prevents excessive inrush cur-

rent during start-up and mode changes. High switching

frequency enables the use of small external capacitors.

Independent MAIN and CAM full-scale current settings

are programmed by two external resistors.

Shutdown mode and current output levels are selected

via two logic inputs. ENM and ENC are toggled to adjust

the LED currents via internal counters and DACs. A 6-bit

linear DAC (64 steps) provides high resolution brightness

control for the MAIN display.

The charge pump optimizes efﬁ ciency based on the volt-

age across the LED current sources. The part powers up

in 1x mode and will automatically switch to boost mode

whenever any enabled LED current source begins to enter

dropout. The LTC3210-1 is available in a 3mm × 3mm

16-lead QFN package. Standard (0.75mm) and ultra-thin

(0.55mm) package proﬁ les are available.

MAIN/CAM LED Controller

CAM

3210-1 is a low noise charge pump DC/DC con-

in 3mm × 3mm QFN

100

3.0

4 LEDs AT 9mA/LED

(TYP V

Efﬁ ciency vs V

= 25°C

3.2

4-LED MAIN Display

AT 9mA = 3V, NICHIA NSCW100)

3.4

3.6

BAT

(V)

3.8

LTC3210-1

Voltage

4.0

4.2

32101 TA01b

4.4

32101fc

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