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Part Number: MAX1553
Description: The MAX1553/MAX1554 drive white LEDs in series with a constant current to provide efficient display ba...
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MAX1553
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DataSheet
General Description
MAX1553 General Description
The MAX1553/MAX1554 drive white LEDs in series with a constant current to provide efficient display backlighting in cellular phones, PDAs, and other hand-held devices. The step-up converter includes an internal 40V, low RDSON, N-channel MOSFET switch for high efficiency and maximum battery life. The MAX1553 has a current limit of 480mA for driving two to six white LEDs, while the MAX1554 has a current limit of 970mA for driving up to 10 white LEDs.
A single analog/PWM Dual Mode™ input provides two simple means of brightness adjustment. A separate enable input provides on/off control. Soft-start minimizes inrush current during startup.
The MAX1553/MAX1554 are available in space-saving 8-pin TDFN 3mm x 3mm packages.
MAX1553 Maximum Ratings
VCC, FB, OV to GND..............................................-0.3V to +6.0V
LX to GND ............................................................-0.3V to +45V
EN, BRT, SS to GND....................................-0.3V to (VCC + 0.3V)
ILX ................................................................................0.9ARMS
Continuous Power Dissipation (TA = +70°C)
8-Pin 3mm x 3mm TDFN
(derate 24.4mW/°C above +70°C) .............................1951mW
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
LX to GND ............................................................-0.3V to +45V
EN, BRT, SS to GND....................................-0.3V to (VCC + 0.3V)
ILX ................................................................................0.9ARMS
Continuous Power Dissipation (TA = +70°C)
8-Pin 3mm x 3mm TDFN
(derate 24.4mW/°C above +70°C) .............................1951mW
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
MAX1553 Features
Constant-Current Regulation for Even LED Illumination
Internal 40V MOSFET Switch Capable of Driving 10 LEDs
Small, Low-Profile External Components
2.7V to 5.5V Input Range
Up to 88% Efficiency Driving 6 LEDs
Up to 82% Efficiency Driving 9 LEDs (20mA, VCC = 3.6V)
Analog or PWM Control of LED Intensity
Optimized for Low Input Ripple
Soft-Start to Minimize Inrush Current
3mm x 3mm 8-Pin TDFN Package
Internal 40V MOSFET Switch Capable of Driving 10 LEDs
Small, Low-Profile External Components
2.7V to 5.5V Input Range
Up to 88% Efficiency Driving 6 LEDs
Up to 82% Efficiency Driving 9 LEDs (20mA, VCC = 3.6V)
Analog or PWM Control of LED Intensity
Optimized for Low Input Ripple
Soft-Start to Minimize Inrush Current
3mm x 3mm 8-Pin TDFN Package
MAX1553 Typical Application
Cellular Phones
PDA, Palmtop, and Wireless Handhelds
Color Display Backlight
PDA, Palmtop, and Wireless Handhelds
Color Display Backlight
MAX1553 Connection Diagram
MAX1553
PDF/DataSheet Download
- Datasheet: MAX1553
- File Size: 292949 KB
- Manufacturer: MAXIM [Maxim Integrated Products]
- Click here to Download
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