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Part Number: MAX1574
Description: The MAX1574 charge pump drives up to three white LEDs with regulated constant current for uniform inte...
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MAX1574
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DataSheet
General Description
MAX1574 General Description
The MAX1574 charge pump drives up to three white LEDs with regulated constant current for uniform intensity. By utilizing adaptive 1x/2x charge-pump modes and very-low-dropout current regulators, it achieves 180mA output drive capability and high efficiency over the 1-cell lithium-battery input voltage range. Fixed-frequency (1MHz) switching allows for tiny external components, and the regulation scheme is optimized to ensure low EMI and low input ripple.
The MAX1574 uses an external resistor to set the fullscale 100% LED current. An enable input (EN) is used for simple on/off control or can be pulsed repeatedly to set lower LED current in multiple steps down to 5%. Once the desired brightness is set, the MAX1574 maintains constant LED current as long as EN is kept high. If EN is kept low for more than 2ms, the MAX1574 enters shutdown.
The MAX1574 is available in a 10-pin 3mm x 3mm TDFN package (0.8mm max height).
MAX1574 Maximum Ratings
IN, OUT, EN to GND...........................................-0.3V to +6.0V
SET, LED1, LED2, LED3, CN to GND .........-0.3V to (VIN + 0.3V)
CP to GND ..................................................................-0.3V to
the greater of (VOUT + 1V) or (VIN + 1V)
OUT Short Circuit to GND .......................................Continuous
Continuous Power Dissipation (TA = +70°C)
10-Pin TDFN (derate 18.2mW/°C above +70°C) ....1454mW
Operating Temperature Range .......................-40°C to +85°C
Junction Temperature..................................................+150°C
Storage Temperature Range ........................-65°C to +150°C
Lead Temperature (soldering, 10s) .............................+300°C
SET, LED1, LED2, LED3, CN to GND .........-0.3V to (VIN + 0.3V)
CP to GND ..................................................................-0.3V to
the greater of (VOUT + 1V) or (VIN + 1V)
OUT Short Circuit to GND .......................................Continuous
Continuous Power Dissipation (TA = +70°C)
10-Pin TDFN (derate 18.2mW/°C above +70°C) ....1454mW
Operating Temperature Range .......................-40°C to +85°C
Junction Temperature..................................................+150°C
Storage Temperature Range ........................-65°C to +150°C
Lead Temperature (soldering, 10s) .............................+300°C
MAX1574 Features
Up to 180mA (60mA/LED) Drive Capability
83% Average Efficiency (PLED / PBATT) Over Li+ Battery Discharge
0.5% (typ) LED Current Matching
Adaptive 1x/2x Mode Switchover
Low Input Ripple and EMI
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
10-Pin 3mm x 3mm TDFN Package
83% Average Efficiency (PLED / PBATT) Over Li+ Battery Discharge
0.5% (typ) LED Current Matching
Adaptive 1x/2x Mode Switchover
Low Input Ripple and EMI
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
10-Pin 3mm x 3mm TDFN Package
MAX1574 Typical Application
LCD Backlighting
Camera Strobes/Flashes and Movie Lights
Cell Phones/Smart Phones
PDAs, Digital Cameras, and Camcorders
Camera Strobes/Flashes and Movie Lights
Cell Phones/Smart Phones
PDAs, Digital Cameras, and Camcorders
MAX1574 Connection Diagram
MAX1574
PDF/DataSheet Download
- Datasheet: MAX1574
- File Size: 224502 KB
- Manufacturer: MAXIM [Maxim Integrated Products]
- Click here to Download
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