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KB4312

Features: •Operating Voltage:2.5V~6.5V•High Operating Frequency: 1.2MHz•High Output Voltage: Up to 28V(max)•Shutdown Current <1􀁐A•18V Output Over-voltage protection (ADJ)•Digital Dimming Control.•Built-in Cycle-by Cycle Current-limiting.•...

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SeekIC No. : 004384123 Detail

KB4312: Features: •Operating Voltage:2.5V~6.5V•High Operating Frequency: 1.2MHz•High Output Voltage: Up to 28V(max)•Shutdown Current <1􀁐A•18V Output Over-voltage pr...

KB4312 Data Sheet

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Part Number:
KB4312
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: 2024/4/28

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Product Details

Description



Features:

•Operating Voltage:2.5V~6.5V
•High Operating Frequency: 1.2MHz
•High Output Voltage: Up to 28V(max)
•Shutdown Current <1􀁐A
•18V Output Over-voltage protection (ADJ)
•Digital Dimming Control.
•Built-in Cycle-by Cycle Current-limiting.
•Built-in Soft-Start Function.
•0.24V Low Reference Voltage(+/-5%)
•Tiny SOT23 Package


Application

• LED Module
• LED Backlight for LCD Display (1 ~6.5 )
• Constant Current Source􀀡


Pinout

Connection Diagram


Specifications

Parameter Rated Value Unit
VIN voltage -0.3 to +6.5 V
LX , OVP voltage -0.3 to +28 V
EN , FB to GND -0.3 to +6.5 V
Switch Current (ILX) 0.25 A
Continuous power dissipation (SOT23-6 Ta=+25 ) 0.35 W
Operating Junction Temperature Range -35 to 85
Lead Temperature (Soldering 5 sec) 260
Storage Temperature -65 to 125
Package Thermal Resistance (�JA) 250 /W
ESD Susceptibility (HBM) 2 KV
ESD Susceptibility (MM) 200 V
Note1:Permanent device damage may occur if Absolute Maximum Ratings are exceeded. Exposure to


Description

The KB4312 step-up converter drives white LEDs with a constant current to provide backlight in cell phones, PDAs, and other hand-held devices. It features allowing series connection of the white LEDs so that the LED currents are identical for uniform brightness. An enable input can be pulsed repeatedly to adjust LED's brightness. The fast 1.2 MHz current-mode PWM control allows for smaller capacitor and inductor. Fault condition protection uses cycle-by-cycle current limiting to sense maximum inductor current, thermal protection and over-voltage protection. Also included soft-start eliminates inrush current during start-up. The 0.24V low reference voltage minimized the power loss across the current-setting resistor.




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