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AP1521

Features: · Inherently Matched LED Current· Drives Up to Four LEDs from a 3.2V Supply· Drives Up to Six LEDs from a 5V Supply· High Efficiency: 84% Typical· Fast 1MHz Switching Frequency· 36V Rugged Bipolar Switch· Low Profile SOT23-5 Pb-Free PackaginApplication· Cellular Phones· PDAs, Hand-held C...

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SeekIC No. : 004286181 Detail

AP1521: Features: · Inherently Matched LED Current· Drives Up to Four LEDs from a 3.2V Supply· Drives Up to Six LEDs from a 5V Supply· High Efficiency: 84% Typical· Fast 1MHz Switching Frequency· 36V Rugged...

AP1521 Data Sheet

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Part Number:
AP1521
Supply Ability:
5000

Price Break

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

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Product Details

Description



Features:

· Inherently Matched LED Current
· Drives Up to Four LEDs from a 3.2V Supply
· Drives Up to Six LEDs from a 5V Supply
· High Efficiency: 84% Typical
· Fast 1MHz Switching Frequency
· 36V Rugged Bipolar Switch
· Low Profile SOT23-5 Pb-Free Packagin


Application

· Cellular Phones
· PDAs, Hand-held Computers
· Digital Cameras
· MP3 Players
· GPS Receivers


Pinout

Connection Diagram


Specifications

Symbol
 Parameter
Rating
Unit
VIN VIN Pin Voltage
10
V
VSW SW Voltage
36
V
VFB Feedback Pin Voltage
10
V
VSHDN SHDN Pin Voltage
10
V
TJ Maximum Junction Temperature
125
TLEAD Lead Temperature
300
TOPR Operating Temperature Range
-40 to +85
TSTG Storage Temperature Range
-40 to +125

Caution The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values must therefore not be exceeded under any condition.





Description

The AP1521 is a step-up DC/DC converter specifically designed to drive white LEDs with a constant current. The device can drive two, three or four LEDs in series from a Li-Ion cell. Series connection of the LEDs provides identical LED currents resulting in uniform brightness and eliminates the need for ballast resistors. The AP1521 switches at 1MHz that allows the use of tiny external components. A low 300mV feedback voltage minimizes power loss in the current setting resistor for better efficiency.




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