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Part Number: MAX1577Z
Description: The MAX1577Y/MAX1577Z charge pumps drive white LEDs, including camera strobes, with regulated current ...
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MAX1577Z
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DataSheet
General Description
MAX1577Z General Description
The MAX1577Y/MAX1577Z charge pumps drive white LEDs, including camera strobes, with regulated current up to 1.2A (guaranteed to 800mA). The very low openloop output resistance allows high flash brightness, even from a low battery input voltage. The adaptive 1x/2x regulating charge-pump operation provides high efficiency (up to 92%) while in movie mode or backlighting. Fast (1MHz) switching allows the use of tiny external components.
The MAX1577Y/MAX1577Z use an external resistor to set the full-scale LED current. Two enable inputs (EN1 and EN2) provide simple on/off control and LED current of 20%, 33%, or 100% full scale. If there is less than 24mV across the external resistor, the output voltage is regulated. The MAX1577Z has fixed 5.1V output-voltage regulation, while the MAX1577Y has logic-controlled output voltage of 3.4V, 4.6V, or 5.1V for backlighting, keyboard, and RGB applications.
The MAX1577Y/MAX1577Z are available in an 8-pin, 3mm x 3mm TDFN package (0.8mm max height).
MAX1577Z Maximum Ratings
IN, OUT, EN1, EN2 to GND...................................-0.3V to +6.0V
OUT to GND During Shutdown....................-0.3V to (VIN + 0.3V)
OUT to CS ...........................................................-0.6V to +0.6V
CS to GND...............................................-0.3V to (VOUT + 0.3V)
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)
8-Pin TDFN (derate 18.2mW/°C above +70°C) ..........1455mW
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
OUT to GND During Shutdown....................-0.3V to (VIN + 0.3V)
OUT to CS ...........................................................-0.6V to +0.6V
CS to GND...............................................-0.3V to (VOUT + 0.3V)
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)
8-Pin TDFN (derate 18.2mW/°C above +70°C) ..........1455mW
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
MAX1577Z Features
Up to 1.2A Output Drive Capability (800mA Guaranteed)
Up to 92% PLED / PBATT Efficiency for Movie Mode
Flexible Brightness Control
Two-Bit Logic for 100%, 33%, 20%, and Off
PWM for 20% to 100%
3% Current Regulation Over Line and Temperature
Current or Voltage Regulation for Flash and Backlighting (MAX1577Y)
Current Regulation for Flash (MAX1577Z)
Low Ripple and EMI
2.7V to 5.5V Supply Voltage Range
Soft-Start Limits Inrush Current
Output-Voltage Regulation Mode
Thermal-Shutdown Protection
8-Pin 3mm x 3mm TDFN Package
Up to 92% PLED / PBATT Efficiency for Movie Mode
Flexible Brightness Control
Two-Bit Logic for 100%, 33%, 20%, and Off
PWM for 20% to 100%
3% Current Regulation Over Line and Temperature
Current or Voltage Regulation for Flash and Backlighting (MAX1577Y)
Current Regulation for Flash (MAX1577Z)
Low Ripple and EMI
2.7V to 5.5V Supply Voltage Range
Soft-Start Limits Inrush Current
Output-Voltage Regulation Mode
Thermal-Shutdown Protection
8-Pin 3mm x 3mm TDFN Package
MAX1577Z Typical Application
White LED Flashes, Strobes, and Movie Lights LCD Backlighting
Camera Phones, Cell Phones, and Smart Phones
PDAs, Digital Cameras, and Camcorders
Camera Phones, Cell Phones, and Smart Phones
PDAs, Digital Cameras, and Camcorders
MAX1577Z Connection Diagram
MAX1577Z
PDF/DataSheet Download
- Datasheet: MAX1577Z
- File Size: 679936 KB
- Manufacturer: MAXIM
- Click here to Download
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