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Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
KB4313
High Efficiency, Constant Current 12 Watt Boost White-LED Driver
FEATURES
•Operating Voltage:2.4V~6.5V
•High Operating Frequency: 1.5MHz •High Efficiency: Up to 95% •High Output Voltage: Up to 34V(max) •High Output Power: Up to 12W(Vin=12V) •Shutdown Current <1PA •16V Output Over-voltage protection (min)
•Digital Dimming Control.
•Built-in Cycle-by Cycle Current-limiting.
•Built-in Soft-Start Function.
•0.2V Low Reference Voltage(3%)
•Tiny SOT23-6 Package
APPLICATIONS
• LED Module • LED Backlight for LCD Display(7”~21” ) • Constant Current Source! • USB host
DESCRIPTION
The KB4313 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 1.5 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 0.2V low reference voltage minimized the power loss across the current-setting resistor.
The KB4313 is available in SOT23-6 packages /
SIMPLIFIED BLOC DIAGRAM
VIN
EN
FB OVP
ON/OFF Control Logic / PWM Dimming Control
CTL VREF(200mV)
+
-
VREF 0.2V
VBG 1.23V
Soft-Start
Control Logic
16V-20V(6.5uA) VBG + -
Overvoltage Protection
Current Limit 1.4A
+
-
N
CTL
GND
LX
REV: 2.0
1
Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
PIN CONFIGURATION
SOT23-6
KB4313
High Efficiency, Constant Current 12 Watt Boost White-LED Driver
313 xxxxx
ORDER INFORMATION
Part number KB4313 GRE
Package SOT23-6, Green
x x x x x : Date Code
Marking 313, Date Code with one bottom line
PIN DESCRIPTION
Pin N0. Symbol 1 LX 2 GND 3 FB
4 EN
5 OVP 6 VIN
I/O I P I
I
I P
Description Step-up Regulator N-MOS Drain. Place output diode and inductor. Ground Step-Up Regulator Feedback Input. Connect a sense resistor from FB to ground. Enable and Dimming Control Input. LED brightness and IC shutdown are controlled by the voltage on EN. Driving low for longer than 4ms to shutdown the IC. Over-voltage protection input. Connect to the output. Power supply.
REV: 2.0
ABSOLUTE MAXIMUM RATINGS (Note 1)
Parameter VIN voltage LX , OVP voltage EN , FB to GND Switch Current (ILX) Continuous power dissipation (SOT23-6 Ta=+25 OC) Operating Junction Temperature Range
Lead Temperature (Soldering 5 sec)
Storage Temperature
Package Thermal Resistance (ӘJA) ESD Susceptibility (HBM) ESD Susceptibility (MM)
Rated Value -0.3 to +6.5 -0.3 to +35 -0.3 to +6.5 1.4 0.35 -35 to 85
260
-65 to 125
250
2 200
Unit V V V A W к к к
к/W KV V
Note1:Permanent device damage may occur if Absolute Maximu.