MAX8645X
1x/1.5x/2x White LED Charge Pumps with Two LDOs in 4mm x 4mm TQFN
Part Details
- Power Up to Eight 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 TQFN, 4mm x 4mm Package
The MAX8645X/MAX8645Y charge pumps drive up to eight white LEDs with regulated constant current for uniform intensity. The main group of LEDs (M1–M6) can be driven up to 30mA per LED for backlighting. The flash group of LEDs (F1 and F2) is independently controlled and can be driven up to 200mA 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. The MAX8645X and MAX8645Y differ only in LDO output voltages. By utilizing adaptive 1x/1.5x/2x charge-pump modes and very-low-dropout current regulators, the MAX8645X/MAX8645Y achieve 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 MAX8645X/MAX8645Y are available in a 28-pin TQFN, 4mm x 4mm (0.8mm max height) lead-free package.
Documentation
This is the most up-to-date revision of the Data Sheet.
Hardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Inductorless (Charge Pump) LED Drivers 3 | ||
| MAX1576 | PRODUCTION | 480mA White LED 1x/1.5x/2x Charge Pump for Backlighting and Camera Flash |
| MAX1573 | PRODUCTION | White LED 1x/1.5x Charge Pump in UCSP and Thin QFN |
| MAX1574 | PRODUCTION | 180mA, 1x/2x, White LED Charge Pump in 3mm x 3mm TDFN |
| Product 5 | ||
| MAX1582 | High-Efficiency Step-Up Converters for White LED Main and Subdisplay Backlighting | |
| MAX1575 | White LED 1x/1.5x Charge Pump for Main and Sub-Displays | |
| MAX8631X | 1x/1.5x/2x White LED Charge Pump with Two LDOs in 4mm x 4mm Thin QFN | |
| MAX8645Y | 1x/1.5x/2x White LED Charge Pumps with Two LDOs in 4mm x 4mm TQFN | |
| MAX8631Y | 1x/1.5x/2x White LED Charge Pump with Two LDOs in 4mm x 4mm Thin QFN | |
| Step-Up (Boost) LED Drivers 4 | ||
| MAX1561 | PRODUCTION | High-Efficiency, 26V Step-Up Converters for Two to Six White LEDs |
| MAX1599 | PRODUCTION | High-Efficiency, 26V Step-Up Converters for Two to Six White LEDs |
| MAX8595 | LAST TIME BUY | High-Efficiency, 36V Step-Up Converters with TA Derating Option for 2 to 9 White LEDs |
| MAX8596 | Obsolete | High-Efficiency, 36V Step-Up Converters with TA Derating Option for 2 to 9 White LEDs |
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