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Part Number: MAX1848
Description: The MAX1848 drives white LEDs with a constant current to provide backlight in cell phones, PDAs, and o...
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MAX1848
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DataSheet
General Description
MAX1848 General Description
The MAX1848 drives white LEDs with a constant current to provide backlight in cell phones, PDAs, and other hand-held devices. The step-up converter topology allows series connection of the white LEDs so that the LED currents are identical for uniform brightness. This configuration eliminates the need for ballast resistors and expensive factory calibration. Other benefits include greater simplicity, lower cost, higher efficiency, and greater reliability.
This step-up PWM converter includes an internal, highvoltage, low RDSON N-channel MOSFET switch for high efficiency and maximum battery life. A single analog voltage Dual Mode™ input provides a simple means of brightness adjustment and on/off control. Fast 1.2MHz current-mode PWM control allows for small input and output capacitors and a small inductor while minimizing ripple on the input supply/battery. Programmable softstart eliminates inrush current during startup.
The MAX1848 is available in space-saving 8-pin thin QFN (3mm ✕ 3mm) and 8-pin SOT23 packages.
MAX1848 Maximum Ratings
V+ to GND ................................................................-0.3V to +6V
PGND to GND ........................................................-0.3V to +0.3V
LX, OUT to GND.......................................................-0.3V to +14V
LX to OUT ...............................................................-14V to +0.3V
CTRL to GND.........................................-0.3V to +6V or (V+ + 2V)
COMP, CS to GND .........................................-0.3V to (V+ + 0.3V)
LX Current ....................................................................0.45ARMS
Continuous Power Dissipation (TA = +70°C)
8-Pin SOT23 (derate 9.7mW/°C above +70°C).............777mW
8-Pin Thin QFN 3mm ✕ 3mm (derate 24.4mW/°C
a bove +70°C)..............................................................1951mW
Operating Temperature Range ............................-40°C to +85°C
Junction Temperature.......................................................+150°C
Storage Temperature Range .............................-60°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PGND to GND ........................................................-0.3V to +0.3V
LX, OUT to GND.......................................................-0.3V to +14V
LX to OUT ...............................................................-14V to +0.3V
CTRL to GND.........................................-0.3V to +6V or (V+ + 2V)
COMP, CS to GND .........................................-0.3V to (V+ + 0.3V)
LX Current ....................................................................0.45ARMS
Continuous Power Dissipation (TA = +70°C)
8-Pin SOT23 (derate 9.7mW/°C above +70°C).............777mW
8-Pin Thin QFN 3mm ✕ 3mm (derate 24.4mW/°C
a bove +70°C)..............................................................1951mW
Operating Temperature Range ............................-40°C to +85°C
Junction Temperature.......................................................+150°C
Storage Temperature Range .............................-60°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
MAX1848 Features
Constant Current Regulation for Uniform Illumination
High 87% Efficiency
Analog or Logic Control of LED Intensity
0.8W Output Power with Internal High-Voltage MOSFET Switch
Small, Low-Profile External Components
2.6V to 5.5V Input Range
13V Maximum Output with Overvoltage Protection
Optimized for Low Input Ripple
Programmable Soft-Start
0.3µA Shutdown Current
Small 8-pin Thin QFN (3mm ✕ 3mm) and 8-Pin SOT23 Packages
High 87% Efficiency
Analog or Logic Control of LED Intensity
0.8W Output Power with Internal High-Voltage MOSFET Switch
Small, Low-Profile External Components
2.6V to 5.5V Input Range
13V Maximum Output with Overvoltage Protection
Optimized for Low Input Ripple
Programmable Soft-Start
0.3µA Shutdown Current
Small 8-pin Thin QFN (3mm ✕ 3mm) and 8-Pin SOT23 Packages
MAX1848 Typical Application
Cell Phones and Smart Phones
PDAs, Palmtops, and Wireless Handhelds
e-Books and Subnotebooks
White LED Display Backlighting
PDAs, Palmtops, and Wireless Handhelds
e-Books and Subnotebooks
White LED Display Backlighting
MAX1848 Connection Diagram
MAX1848
PDF/DataSheet Download
- Datasheet: MAX1848
- File Size: 273957 KB
- Manufacturer: MAXIM [Maxim Integrated Products]
- Click here to Download
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