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SM8121A

Features: `Boost-up control using PWM`2 to 6 lights of white LED (connected in series) lighted`Output current value can be set by external resistors (51: 9.8mA, 33: 15.2mA, 24: 20.8mA)`Brightness adjustable by control to FB pin or CE pin`Current variation among LED decreased by high precision`High...

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SeekIC No. : 004494051 Detail

SM8121A: Features: `Boost-up control using PWM`2 to 6 lights of white LED (connected in series) lighted`Output current value can be set by external resistors (51: 9.8mA, 33: 15.2mA, 24: 20.8mA)`Brightness ad...

SM8121A Data Sheet

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Part Number:
SM8121A
Supply Ability:
5000

Price Break

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

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Upload time: 2024/11/23

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Product Details

Description



Features:

 `Boost-up control using PWM
 `2 to 6 lights of white LED (connected in series) lighted
 `Output current value can be set by external resistors (51: 9.8mA, 33: 15.2mA, 24: 20.8mA)
 `Brightness adjustable by control to FB pin or CE pin
 `Current variation among LED decreased by high precision
 `High efficient drive by step-up model
 `Supply voltage range: 2.3 to 5.5V
 `Maximum output voltage: 25V
 `Quiescent current: 400A (typ)
 `Standby current: 1.0A (max)
 `RON(Switching MOS-Tr): 2(typ)
 `Switching frequency: 1.0MHz (typ)
 `Output current detection accuracy:±2%
 `Small package: SOT23-5 (SM8121AH) SON-6 (SM8121AD)


Application

 ·Cellular phone
 ·Pager
 ·Digital still camera
 ·Handy terminal
 ·PDAs
 ·Portable games
 ·White LED drive
 ·LCD bias supply
 ·Flash memory supply


Pinout

Connection Diagram


Specifications

Parameter
Symbol
Rating
Unit
Supply voltage range
VDD
− 0.3 to 6.5
V
Input voltage range
VIN
VSS 0.3 to VDD + 0.3
V
SW output voltage range
VSW
0.3 to 27
V
SW input current
ISW
500
mA
Power dissipation
PD
250 (Ta = 25)
mW
Operating temperature range
Topr
-40 to 85
Storage temperature range
Tstg
-55 to 125



Description

The SM8121A is a high efficiency step-up DC-DC converter. Due to high voltage CMOS process realizing 25V output supply as maximum value, 2 to 6 lights of white LED connected in series can be lighted. By connecting in series, current variation among LED is eliminated. Current value sent to white LED can be set by external resistors. In addition, brightness can also be adjusted by control to FB pin or CE pin.




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