MAX1575
White LED 1x/1.5x Charge Pump for Main and Sub-Displays
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First 85% Efficient, Fractional, White-LED Charge Pump with Dual, Single-Wire Dimming Control for Main and Sub-Displays
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Features
- Powers Main and Sub-Display LEDs
- 85% Average Efficiency (PLED / PBATT) Over Li+ Battery Discharge
- 2% LED Current Matching
- Up to 30mA/LED Drive Capability
- Adaptive 1x/1.5x Mode Switchover
- Low Input Ripple and EMI
- Individual 5% to 100% Dimming Through Single-Wire Serial Pulse Interface
- Low 0.1µA Shutdown Current
- 2.7V to 5.5V Supply Voltage Range
- Soft-Start Limits Inrush Current
- Output-Overvoltage Protection
- Thermal-Shutdown Protection
- 16-Pin Thin QFN 4mm x 4mm Package
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The MAX1575 charge pump drives up to four white LEDs in the main display and up to two white LEDs in the sub-display with regulated constant current for uniform intensity. By utilizing adaptive 1x/1.5x charge-pump modes and very-low-dropout current regulators, it achieves high efficiency over the full 1-cell lithium-battery input voltage range. A 1MHz fixed-frequency switching allows for tiny external components, and the regulation scheme is optimized to ensure low EMI and low input ripple.
The MAX1575 uses an external resistor to set the full-scale 100% LED current. Two enable inputs, ENM and ENS, are used for simple on/off controls for the main and sub-displays, respectively. By repeatedly pulsing either enable input, the LEDs can be dimmed in multiple steps down to 5%. Once the desired brightness is set, the MAX1575 maintains that brightness setting as long as the enable input is kept high. If an enable input is kept low for more than 2ms, the LED current for the respective display is set to zero. If both enable inputs are kept low for more than 2ms, the MAX1575 enters shutdown.
The MAX1575 is available in a 16-pin 4mm x 4mm thin QFN package (0.8mm max height).
Applications
- Cell Phones with Main and Sub-Displays
- PDAs/Smartphones with Up to Six White LEDs
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MAX1575
Documentation
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Data Sheet
3
MAX1575: White LED 1x/1.5x Charge Pump for Main and Sub-Displays Data Sheet (Rev.2)
Documentation
Software & Part Ecosystem
| Parts | Product Life Cycle | Description | ||
|---|---|---|---|---|
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Inductorless (Charge Pump) LED Drivers4 |
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PRODUCTION |
White LED Current Regulator with 1x/1.5x High-Efficiency Charge Pump |
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PRODUCTION |
1.5x/2x High-Efficiency White LED Charge Pumps |
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|
PRODUCTION |
White LED 1x/1.5x Charge Pump in UCSP and Thin QFN |
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PRODUCTION |
180mA, 1x/2x, White LED Charge Pump in 3mm x 3mm TDFN |
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Product2 |
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1.5x/2x High-Efficiency White LED Charge Pumps |
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High-Efficiency Step-Up Converters for White LED Main and Subdisplay Backlighting |
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Regulated Buck-Boost Charge Pumps1 |
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PRODUCTION |
Regulated 3.3V/5.0V Step-Up/Step-Down Charge Pump |
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Step-Up (Boost) LED Drivers6 |
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PRODUCTION |
White LED Step-Up Converter in SOT23 |
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PRODUCTION |
High-Efficiency, 26V Step-Up Converters for Two to Six White LEDs |
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PRODUCTION |
High-Efficiency, 26V Step-Up Converters for Two to Six White LEDs |
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PRODUCTION |
High-Efficiency, 40V Step-Up Converters for 2 to 10 White LEDs |
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PRODUCTION |
High-Efficiency, 40V Step-Up Converters for 2 to 10 White LEDs |
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PRODUCTION |
High-Efficiency Step-Up Current Regulator for LEDs |
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