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MAX1707
Light-Management IC with Efficient 1x/1.5x/2x Charge Pump for Backlight/Flash/RGB LEDs
High-Efficiency Backlight and Flash Driver with Up to 400mA Flash Capability and 3 RGB Drivers with a Programmable RGB Ramp for Main, Sub, RGB, Keypad, or Flash Applications in a Compact, 4mm x 4mm TQFN Package
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Status
Active: In Production.
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 adaptive 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 I²C serial 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 rampup/down rates. The camera flash may be turned on/off by the I²C port or a separate digital logic input.
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Data Sheet
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An evaluation kit is available: MAX1707EVCMODU, MAX1707EVKIT
Key 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
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Applications/Uses
- Cell Phones/Smartphones
- Displays with Up to 11 LEDs
- PDAs, Digital Cameras, Camcorders
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Key Specifications:
| White LED Drivers |
| Part Number |
Topology |
LEDs |
Config. |
Dimming Control |
VDROPOUT
(mV) |
VCURR_SENSE
(mV) |
POUT
(W) |
ILED
(mA) |
VIN
(V) |
VIN
(V) |
ICC
(mA) |
VOUT
(V) |
Oper. Freq.
(kHz) |
Package/Pins |
| max num. of |
typ |
max |
min |
max |
max |
max |
| MAX1707 |
Charge Pump |
11 |
Parallel |
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40 |
100 |
2.5 |
100 |
2.7 |
5.5 |
6.5 |
5 |
1000 |
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See All White LED Drivers (47)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
 Typical Operating Circuit
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Information Index
Document Ref.: 19-3744
Rev 0;
2006-01-23
This page last modified: 2010-05-26
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