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AX2016/A 40V, 1.7A, Boost for 10 White LED Driver
GENERAL DESCRIPTION The AX2016/A is a step-up converter designed for driving up to 10 series white LEDs for backlighting application. The AX2016/A uses current mode, 1MHZ fixed frequency architecture to regulate the LED current, which is set through an external current sense resistor. Its low 300mV feedback voltage reduces power loss and improves efficiency. The OV pin monitors the output voltage and turns off the converter if an over-voltage condition is present due to an open circuit condition. The AX2016/A includes under-voltage lockout, current limiting and thermal shutdown protection preventing damage in the event of an output overload. The driver is available in small 6-pin TSOT-23 and 8-pin TDFN (2mm x 2mm) packages. FEATURES 2.5V to 5.5V operating input voltage range Drives up to 10 series White LEDs 1MHz Fixed Switching Frequency Wide range for PWM dimming •yÑb€ (200Hz to 200KHz) R ` Internal 1.7A switching Ûmwcurrent limit om V Over Voltage Protection (OVP) h.c tec Internal Soft-start Function o f .go shutdown protection Current limit and Thermal w w Under voltage w Lockout Available in the 6-pin TSOT-23 and 8-pin TDFN Packages
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Axelite Confidential Materials, do not copy or distribute without written consent.
AX2016/A
BLOCK DIAGRAM
VCC EN
UVLO Reference 1.238V
Soft Start
Enable Logic
10ms OVP
Shutdown
OV
300mV FB
Error Amplifier
Summing Comparator
Thermal Shutdown SW Control and Driver Logic
N-MOS
Oscillator 1MHz GND
Slope Compensation
Current Sense
PIN ASSIGNMENT The packages of AX2016/A are TSOT-23-6L and TDFN-8L; the pin assignment is given by:
GND 1 VCC 2
(GND) 8 7
SW NC FB GND
OV 3 EN 4
VÛmw`R•yÑb€
6 5
Name GND VCC OV EN
Description Ground Pin Power Input Pin OVP Sense Pin Enable with Dimming Pin; Internal Pull-Low; Logic High Active Feedback Pin; Put a Resistor to GND to Setting the Current No Connect Pin Switch Output Pin
TDFN-8L (2*2)
(Top View)
w.goftechm
SW GND FB
1 2 3 TSOT-23-6L
6 5 4
VCC OV EN
FB NC SW
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Axelite Confidential Materials, do not copy or distribute without written consent. Rev.1.0 Nov.26, 2012
AX2016/A
ORDER/MARKING INFORMATION Order Information
AX2016X XX X
FB Type BLANK: 0.3V A: 0.2V Package Type Packing Blank : Bag CT: TSOT-23-6L Z8: TDFN-8L (2*2) A : Taping
J C Y WX
Top Marking (TSOT-23-6L) ID Code: Internal J D Y WX
Week: 01~26(A~Z) 27~52(a~z) Year : A = 2010 1 = 2011 2 = 2012 : : 9 = 2019
ID Code: Internal Week: 01~26(A~Z) 27~52(a~z) Year : A = 2010 1 = 2011 2 = 2012 : : 9 = 2019
AX2016
AX2016A
Top Marking (TDFN-8L)
JC YWX
AX2016 ID Code: Internal Week: 01~26(A~Z) 27~52(a~z) Year : A = 2010 1 = 2011 2 = 2012 : : 9 = 2019
JD YWX
ABSOLUTE MAXIMUM RATINGS o (at m T =25°C) .c A h c Characteristicste Symbol VCC Pin Voltage SW Pin Voltage OV Pin Voltage EN, FB Pin Voltage Power Dissipation Storage Temperature Range Operating Junction Temperature Range Thermal Resistance from Junction to TSOT-23-6L case TDFN-8L Thermal Resistance from Junction to TSOT-23-6L ambient TDFN-8L PD TST TOP θJC θJA
VÛm
•y w`R
Ñb€
AX2016A ID Code: Internal Week: 01~26(A~Z) 27~52(a~z) Year : A = 2010 1 = 2011 2 = 2012 : : 9 = 2019
fo .go w ww
Rating -0.3 to 6 -0.3 to 45 -0.3 to 45 -0.3 to 6 ( TJ-TA ) / θJA -65 to +150 -40 to +125
180 25 250 120
Unit V V V V mW °C °C °C/W °C/W
VCC VSW VOV
Note: θJA is measured with the PCB copper area of approximately 1 in2 (Multi-layer). 3/11
Axelite Confidential Materials, do not copy or distribute without written consent. Rev.1.0 Nov.26, 2012
AX2016/A
ELECTRICAL CHARACTERUSTICS (VCC=5V, IOUT = 20mA, TA = 25°C, unless otherwise noted) Characteristics Symbol Conditions Input Voltage Range Step-Up Voltage Range OV Sense Voltage Under Voltage Lockout UVLO Hysteresis Feedback Voltage EN Threshold EN Hysteresis Operating Quiescent Current ICCQ IOUT= 0mA, VFB =0.5V Shutdown Current ISD VEN=0V, tEN > 20ms N-Channel MOSFET Current Limit ILIM Duty=50% (Note1) € b Ñ •y MOSFET On-Resistance (Note1) w`R RDS(on) Maximum Duty Cycle Line Regulation Switching Frequency Dimming Clock Rate FB Input Leakage Current SW Leakage Current EN Input Leakage Current Shutdown Delay Thermal Shutdown Thermal Shutdown Hysteresis Note1: Guaranteed by design. AX2016 AX2016A Logic-High Voltage Logic-Low Voltage VFB VFB VIH VIL VCC VOUT VOV UVLO Rising
Min Typ Max Units 2.5 3 38 2.2 100 2.4 5.5 40 V V V V mV
285 300 315 mV 190 200 210 mV 2.0 200 1 1.7 0.75 0.2 VLX = 30V, VFB =0.5V 0.6 88 1 1 1.5 10 160 30 0.4 4 1.0 V V mV μA μA A Ω % %
300 500
VÛm
ww
o w.g
c fote
. D MAX h
FOSC FDIM
com
VCC = 3V to 5V
1.25 MHz 200 KHz nA µA μA μA mS °C 1 3 1 -
IFB-LKG VFB = 0.5V ISWL IEN-LKG1 VEN= VCC IEN-LKG2 VEN= GND TSHDN TSD TSH
0.01 100
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Axelite Confidential Materials, do not copy or distribute without written consent. Rev.1.0 Nov.26, 2012
AX2016/A
APPLICATION CIRCUIT (1) 10 series LED application
(2)
LED Dimming applicationÑb€
w`R m Û V w
•y
ww
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te
c.