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MAX1848

Features: Constant Current Regulation for Uniform IlluminationHigh 87% EfficiencyAnalog or Logic Control of LED Intensity0.8W Output Power with Internal High-Voltage MOSFET SwitchSmall, Low-Profile External Components2.6V to 5.5V Input Range13V Maximum Output with Overvoltage ProtectionOptimized f...

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MAX1848: Features: Constant Current Regulation for Uniform IlluminationHigh 87% EfficiencyAnalog or Logic Control of LED Intensity0.8W Output Power with Internal High-Voltage MOSFET SwitchSmall, Low-Profile ...

MAX1848 Data Sheet

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Part Number:
MAX1848
Supply Ability:
5000

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  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



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


Application

Cell Phones and Smart Phones
PDAs, Palmtops, and Wireless Handhelds
e-Books and Subnotebooks
White LED Display Backlighting


Pinout

Connection Diagram


Specifications

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


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.




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