MAX8631X, MAX8631Y 1x/1.5x/2x White LED Charge Pump with Two LDOs in 4mm x 4mm Thin QFN

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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).

Key Features

Applications/Uses

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 (P_LED/P_BATT) 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 T_A 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

	Backlighting and Flash
	Camera Phones and Smartphones
	PDAs, Digital Cameras, and Camcorders

Key Specifications: White LED Drivers

Part Number

Topology

Max. No. of LEDs

Configuration

Dimming Control

P_OUT (W)

I_MAX per LED (mA)

Min. V_IN (V)

Max. V_IN (V)

I_CC (max) (mA)

Max. V_OUT (V)

Fixed Freq.

Operating Freq. (kHz)

Soft Start

Internal Power Switch(es)

Shutdown

Open LED Protection

Camera Flash

LED Temp. Derating

EV-Kit

RoHS Available

Package

Smallest Available Package (max w/pins) (mm²)

Operating Temp. Range (°C)

Price^**

MAX8631

Charge Pump

Parallel

Digital
PWM
Serial Pulse

2.25

100

2.7

5.5

Yes

1000

Yes

THIN QFN/28

-40 to +85

$2.70 @ 1k

See All White LED Drivers (42)

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.