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LTC3210-1
MAIN/CAM LED Controller
with 64-Step Brightness Control
in 3mm × 3mm QFN
Low Noise Charge Pump Provides High Efficiency
Multi-LED Light Supply for Cell Phones/DSCs/PDAs
FEATURES
n
with Automatic Mode Switching
n Multimode Operation: 1x, 1.5x, 2x
n Individual Full-Scale Current Set Resistors
n Up to 500mA Total Output Current
n Single Wire EN/Brightness Control for MAIN and
CAM LEDs
n 64:1 Linear Brightness Control Range for
MAIN Display
n Four 25mA Low Dropout MAIN LED Outputs
n One 400mA Low Dropout CAM LED Output
n Low Noise Constant-Frequency Operation
n Low Shutdown Current: 3μA
n Internal Soft-Start Limits Inrush Current During
Startup and Mode Switching
n Open/Short LED Protection
n No Inductors
n 3mm × 3mm × 0.75mm 16-Lead Plastic QFN Package
APPLICATIONS
n
L , LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners.
DESCRIPTION
The LTC ? 3210-1 is a low noise charge pump DC/DC con-
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 efficiency 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 ×
0.75mm 16-lead QFN package.
TYPICAL APPLICATION
C2 C3
2.2μF 2.2μF
100
90
4-LED MAIN Display
Efficiency vs V BAT Voltage
C1P
C1M C2P
C2M
MAIN
CAM
80
V BAT
C1
2.2μF
V BAT
LTC3210-1
CPO
C4
2.2μF
70
60
ENM
ENC
ENM
ENC
RM
30.1k
1%
RC
24.3k
1%
MLED1
MLED2
MLED3
MLED4
GND CLED
32101 TA01
50
40
30
20 4 LEDs AT 9mA/LED
10 (TYP V F AT 9mA = 3V, NICHIA NSCW100)
T A = 25°C
0
3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4
V BAT (V) 32101 TA01b
32101fd
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