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MAX8631X, MAX8631Y
1x/1.5x/2x White LED Charge Pump with Two LDOs in 4mm x 4mm Thin QFN
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Status
Active: In Production.
Description
The MAX8631X/Y charge pump drives up to eight white LEDs with regulated constant current for uniform intensity. The main group of LEDs (M1–M4) can be driven up to 30mA per LED for backlighting. The flash group of LEDs (F1–F4) is independently controlled and can be driven up to 100mA per LED (or 400mA total). Two 200mA LDOs are on-board to provide power for camera functions. The LDOs, output voltages are pin-programmable to meet different camera-module requirements. By utilizing adaptive 1x/1.5x/2x charge-pump modes and very-low-dropout current regulators, the MAX8631X/Y achieves high efficiency over the full 1-cell lithium-battery voltage range. The 1MHz fixed-frequency
switching allows for tiny external components, and the regulation scheme is optimized to ensure low EMI and low input ripple.
The MAX8631X/Y is available in a 28-pin thin QFN, 4mm x 4mm lead-free package (0.8mm max height).
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Data Sheet
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An evaluation kit is available: MAX8631XEVKIT
Key Features
- Powers Up to 8 LEDs
- Up to 30mA/LED Drive for Backlight
- Up to 400mA Total Drive for Flash
- Two Internal Low-Noise 200mA LDOs
- 94% Max/85% Avg Efficiency (PLED/PBATT) over Li+ Battery Discharge
- 0.2% Typical LED Current Matching
- Adaptive 1x/1.5x/2x Mode Switchover
- Single-Wire Serial Pulse Interface for Brightness Control (32 Steps)
- 2-Bit Logic (Three Levels)
- Thermal TA Derating Function
- Low Input Ripple and EMI
- 2.7V to 5.5V Supply Voltage Range
- Soft-Start, Overvoltage, and Thermal-Shutdown Protection
- 28-Pin Thin QFN, 4mm x 4mm Package
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Applications/Uses
- Backlighting and Flash
- Camera Phones and Smartphones
- PDAs, Digital Cameras, and Camcorders
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Key Specifications:
| White LED Drivers |
| Part Number |
Topology |
LEDs |
Config. |
Dimming Control |
POUT
(W) |
ILED
(mA) |
VIN
(V) |
VIN
(V) |
ICC
(mA) |
VOUT
(V) |
Oper. Freq.
(kHz) |
Package/Pins |
| max num. of |
max |
min |
max |
max |
max |
| MAX8631 |
Charge Pump |
8 |
Parallel |
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2.25 |
100 |
2.7 |
5.5 |
6 |
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.: 19-3688
Rev 3;
2008-07-01
This page last modified: 2008-07-01
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