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LTC3230
5-LED Main/Sub Display
Driver with Dual LDO
FEATURES
DESCRIPTION
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Low Noise Charge Pump Provides High Ef?ciency
with Automatic Mode Switching
Multimode Operation: 1x, 1.5x, 2x
Full-Scale Current Set Resistor
Up to 125mA Total LED Current
Single Wire Enable/Brightness Control for Main and
Sub Display LEDs
32:1 Linear LED Brightness Control
Dual 200mA Linear Regulators
Four 25mA Low Dropout Main LED Current Sources
One 25mA Low Dropout Sub LED Current Source
Low Noise Constant Frequency Operation
Low Shutdown Current: 3μA
Internal Soft-Start Limits Inrush Current During
Start-Up and Mode Switching
Open/Short LED Protection
No Inductors
20-Lead 3mm × 3mm QFN Package
The LTC ? 3230 is a low noise charge pump DC/DC converter
designed to drive 4 Main LEDs and 1 Sub LED, plus two
200mA linear regulators to provide additional system
power. The LTC3230 charge pump requires only four small
ceramic capacitors and one current set resistor 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.
Main and Sub full-scale current settings are programmed
by a single external resistor.
Charge pump ef?ciency is optimized based on the voltage
across the LED current sources. The part powers up in 1x
mode and automatically switches to the next higher mode,
1.5x and subsequently 2x, whenever any LED current
source approaches dropout.
Two 200mA linear regulators have independent enable
APPLICATIONS
and output voltage select pins. Each regulator can be set
to one of three pre-selected output voltages with tri-level
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Multi-LED Driver and Dual LDO Supplies for Cell
input pins. The regulators may be enabled independently
Phone, PDA, Digital Camera and PND Applications
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Protected by U.S. Patents
including 6411531.
TYPICAL APPLICATION
of the charge pump.
The LTC3230 is available in a low pro?le (0.75mm) 3mm
× 3mm 20-lead QFN package.
C1
C2
1 F
1 F
100
Ef?ciency vs V IN Voltage
V IN = 2.7V
TO 5.5V
C3
2.2 F
C1P C1M C2P C2M
V IN CPO
LTC3230
125mA
C6
1 F D1
D2
MAIN
D3
D4
SUB
D5
90
80
70
ENM
ENS
ENM
ENS
MLED1
MLED2
MLED3
MLED4
60
50
40
ENLDO1
ENLDO2
V1
V2
SLED
LDO1
C4
1 F
1.5V
200mA
3230 TA01a
30
20
4 LEDs AT 9mA/LED
R SET
17.4k
1%
R SET
GND
LDO2
C5
1 F
2.8V
200mA
10
0
3
V F = 3V
T A = 25 ° C
3.2
3.4
3.6
3.8
4
4.2
4.4
ENM OR ENS
V IN (V)
SET BRIGHTNESS LEVEL
ON
OFF
3230 TA01b
3230fa
1
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