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SM8131B

Features: ` Battery life extension by automatic charge pump switch between*1 and*1.5 according to the detection of the LED drive current` Controlling 1 to 6 lights of white LED connecte din parallel` Set up LED drive current value by external resistor(5k:5mA/ch, 15k:15mA/ch, 20k:20mA/ch)` Dividing...

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SeekIC No. : 004494052 Detail

SM8131B: Features: ` Battery life extension by automatic charge pump switch between*1 and*1.5 according to the detection of the LED drive current` Controlling 1 to 6 lights of white LED connecte din parallel...

SM8131B Data Sheet

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Part Number:
SM8131B
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:

` Battery life extension by automatic charge pump switch between*1 and*1.5 according to the detection of the LED drive current
` Controlling 1 to 6 lights of white LED connecte din parallel
` Set up LED drive current value by external resistor(5k:5mA/ch, 15k:15mA/ch, 20k:20mA/ch)
` Dividing 6-channel to 2-groups by setting upSEL1/SEL2 pins (L/L=6:0ch, L/H=5:1ch,H/L=4:2ch, H/H=3:3ch)
` 2-wire input controlling (1-wire input controlling when SEL1/SEL2 pins are set to "LOW")
` ON/OFF and brightness control by input signal controlling of EN1/EN2 pins
` Supply voltage range
•  No-load current (IOUT=0mA): 2.7 to 4.6V
•  Load current (IOUT=120mA): 3.3 to 4.6V
` Maximum output voltage: 4.2V (typ)
` Maximum output current: 120mA (typ)
` Quiescent current
    • Not-switching (*1 mode): 0.7mA (typ)
    • Switching (*1.5 mode): 2.0mA (typ)
` Standby current (Power save mode): 0.01A (typ)
` Operating frequency ( *1.5 mode): 750kHz (typ)
` LED drive current accuracy (RSET=20k):20mA±3%
` Input signal frequency for dimming (Duty=50%):150kHz (max)
` Package:20-pin QFN


Application

· Cellular phone
· PDA
· Portable games
· Handy terminal
· Digital still camera
· Digital video camera
· LCD back light
· White LED driving


Pinout

Connection Diagram


Specifications

Parameter
Symbol
Rating
Unit
Input voltage range
VIN
− 0.3 to 6.5
V
Input voltage range
VEN ,VSEL
V GND 0.3 to V IN + 0.3
V
Output voltage range
VDIN1 to 6
 V GND 0.3 to V IN + 0.3
V

VOUT
6.5
V
Power dissipation
PD
1429 (Ta = 25 ° C) *1
mW
Operating temperature range
Ta
30 to 85
Storage temperature range
Tstg
-55 to 125
*1.When mounted on a 34*40*1.6mm glass epoxy board, the power dissipation is related to the operating temperature by the following equation.


Description

The SM8131B is a charge pump DC/DC converter that switches between ×1 and × 1.5 automatically. The switches between × 1 and × 1.5 according to detected LED drive current, so that the battery life can be prolonged to the fullest extent. Since the connected LED are all detected for the switching, it can respond to the variation of LED forward voltage. 6-channel of LED drive current control circuit is built-in, the SM8131B can control 1 to 6 lights of white LED, which are connected in parallel. The LED drive current per channel is set up by external resistor. Besides, by setting up SEL1/SEL2 pins, 6-channel of LED drive current control circuit can be divided to 2-groups, and input signal controlling of EN1/EN2 pins allow ON/OFF and dimming per group.




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