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MAX1707 Fiches technique(PDF) 1 Page - Maxim Integrated Products

No de pièce MAX1707
Description  Light-Management IC with Efficient 1x/1.5x/2x Charge Pump for Backlight/Flash/RGB LEDs
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Fabricant  MAXIM [Maxim Integrated Products]
Site Internet  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX1707 Fiches technique(HTML) 1 Page - Maxim Integrated Products

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General Description
The MAX1707 provides complete light management for
main display backlight, subdisplay backlight (or RGB
indicator), and white LED camera flash with regulated
constant current up to 610mA total. By utilizing adap-
tive 1x/1.5x/2x charge-pump modes and very-low-
dropout current regulators, it achieves high efficiency
over the full 1-cell Li+ battery input voltage range. The
1MHz fixed-frequency switching allows for tiny external
components while the regulation scheme is optimized
to ensure low EMI and low input ripple. An integrated
derating function protects the LEDs from overheating
during high ambient temperatures.
The MAX1707 features an internally trimmed reference
to set the maximum LED current. An I2Cserial port is
used for on/off control and setting the LED currents in
32 linear steps. When using the RGB indicator, the I2C
port provides 32k colors and programmable ramp-
up/down rates. The camera flash may be turned on/off
by the I2C port or a separate digital logic input.
Applications
Cell Phones and Smartphones
PDAs, Digital Cameras, Camcorders
Displays with Up to 11 LEDs
Features
♦ Guaranteed 610mA Continuous Drive Capability
4 LEDs at 30mA Each for Main Display
3 LEDs at 30mA Each for Sub or RGB
400mA Total for Flash
♦ 2-Wire I2C Serial Port
5-Bit (32-Step) Linear Dimming
32k Colors
Ramp-Up/Down Rates
♦ 92% Peak/83% Avg Efficiency (PLED/PBATT)
♦ Adaptive 1x/1.5x/2x Mode Switchover
♦ 0.3% (typ) LED Current Accuracy and Matching
♦ Low Input Ripple and EMI
♦ Low 0.1µA Shutdown Current
♦ Output Overvoltage Protection
♦ Thermal Derating Function Protects LEDs
♦ 24-Pin 4mm x 4mm Thin QFN Package
Light-Management IC with Efficient 1x/1.5x/2x
Charge Pump for Backlight/Flash/RGB LEDs
________________________________________________________________ Maxim Integrated Products
1
Ordering Information
MAX1707
1
µF1µF
10
µF
0.1
µF
IN
PIN
SDA
SCK
STB
GND
OUT
C1P
C1N
PGND
C2P
FLASH
MAIN
C2N
4.7
µF
I2C PORT
ON/OFF AND
BRIGHTNESS
INPUT
2.7V TO 5.5V
OUTPUT
UP TO 610mA
M1
M2
M3
M4
S1
S2
S3
F1
F2
F3
F4
STROBE
ON/OFF
VLOGIC
VDD
SUB OR RGB
Typical Operating Circuit
19-3744; Rev 0; 7/05
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Pin Configuration appears at end of data sheet.
EVALUATION
KIT
AVAILABLE
PART
TEMP RANGE
PIN-
PACKAGE
PKG
CODE
MAX1707ETG
-40°C to +85°C
24 Thin QFN
4mm x 4mm
T2444-4
Purchase of I2C components from Maxim Integrated Products,
Inc., or one of its sublicensed Associated Companies, conveys
a license under the Philips I2C Patent Rights to use these com-
ponents in an I2C system, provided that the system conforms to
the I2C Standard Specification as defined by Philips.


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