AP30191
May 2007 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
General Description
The AP3019 is an inductor-bad DC/DC converter designed to drive up to five white LEDs in ries for backlight. Only one feedback resistor is needed to con-trol the LED current and obtain satisfied brightness. A constant frequency 1.0MHz PWM control scheme is employed in this IC, which means the tiny external components can be ud. In fact, 1mm tall inductor and 0.22µF output capacitor for the typical application is very appropriate. Additionally, the schottky diode in boost circuit is integrated in this chip. AP3019 also provides a disable port to ea its u for different sys-tems.
The over output voltage protection is equipped in AP3019. When any LED is broken or in other abnor-mal conditions, the output voltage will be clamped to 27V .
The AP3019 is available in standard SOT-23-6 and TSOT-23-6 packages.
Features
·Inherently Uniform LED Current ·High Efficiency up to 84%
·No Need for Extra Schottky Diode ·Over Output V oltage Protection ·Drives 2 to 5 LEDs
·Fast 1.0MHz Switching Frequency ·Us Tiny 1mm Tall Inductor
·
Requires Only 0.22µF Output Capacitor
Applications
抗战胜利纪念日·Cellular Phones ·Digital Cameras ·LCD modules ·GPS Receivers
·
PDAs, Handheld Computers
Figure 1. Package Types of AP3019
SOT-23-6
TSOT-23-6
AP30192
May 2007 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
Figure 2. Pin Configuration of AP3019 (Top View)
Pin Configuration
Pin Description
Pin Number
Pin Name Function
1SW Switch Pin. Connect external inductor 2GND Ground Pin
3FB V oltage Feedback. Reference voltage is 200mV
4 CTRL Shutdown and Dimming Pin. Connect to 1.8V or higher to enable device; Connect to 50mV or less to disable device; Connect to a voltage between 1.8V and 50mV to achieve linear dim-ming
5V OUT Output Pin. Connected to the cathode of internal schottky diode 6
V IN
Input Supply Pin. Must be locally bypasd
(SOT-23-6/TSOT-23-6)
SW GND FB
V IN V OUT CTRL
K/KT Package
AP30193
May 2007 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
Functional Block Diagram
Figure 3. Functional Block Diagram of AP3019
GND
FB
V IN
SW
Package
Temperature Range
Part Number
战争纪念馆Marking ID
Packing Type
SOT-23-6-40 to 85o C AP3019KTR-E1E9S Tape & Reel TSOT-23-6
-40 to 85o C
AP3019KTTR-E1
S9E
Tape & Reel
BCD Semiconductor's Pb-free products, as designated with "E1" suffix in the part number, are RoHS compliant.
Circuit Type Package K: SOT-23-6E1: Lead Free AP3019 -
TR: Tape and Reel
Ordering Information
V OUT
CTRL
KT: TSOT-23-6
AP30194
May 2007 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
Parameter Symbol Value Unit Input V oltage V IN
20V SW V oltage 27V FB V oltage 20V CTRL V oltage
20V Thermal Resistance (Junction to Atmosphere, no Heat sink) R θJA 265o
C/W
Operating Junction Temperature 150o C Storage Temperature Range T STG -65 to 150o C Lead Temperature (Soldering, 10c)T LEAD 260o C
ESD (Machine Model)250V ESD (Human Body Model)
2000
V
Note 1: Stress greater than tho listed under "Absolute Maximum Ratings" may cau permanent damage to the device. The are stress ratings only, and functional operation of the device at the or any other conditions beyond tho indi-cated under "Recommended Operating Conditions" is not implied. Exposure to "Absolute Maximum Ratings" for extended periods may affect device reliability.
Parameter
Symbol
Min
火鸡的做法Max
Unit
Operating Temperature Range T OP -40 85 o C Input V oltage V IN 2.5
16
社会主义500年V
CTRL V oltage
V CTRL
16
V
Recommended Operating Conditions
Absolute Maximum Ratings (Note 1)
AP30195
硬盘是什么意思May 2007 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
(V IN =3V , V CTRL =3V , T A =25o C, unless otherwi specified.)
Parameter
Symbol Conditions
Min Typ
Max
Unit
Minimum Operating V oltage V IN (min) 2.5
V
Maximum Operating V oltage V IN (max)16Feedback V oltage V FB I OUT =20mA, 4 LEDs, T A =-40o C to 85o C
188
200212mV FB Pin Bias Current I FB 35100nA Supply Current I CC V FB =V IN , Not Switching 1.3 2.0 2.7mA Supply Current I Q V CTRL =0V
2.0
3.2 5.0µA Switching Frequency f 0.7 1.0 1.3
MHz Maximum Duty Cycle D MAX 90
93%Switch Current Limit (Note 2)I LIMIT T A =25o C, D=40%500mA
T A =25o C, D=80% 350Switch V CE Saturation V oltage V CESAT
I SW =250mA
360
mV Switch Leakage Current V SW =5V 0.015
µA CTRL Pin V oltage
V CTRL High 1.8
V
Low
0.05
CTRL Pin Bias Current
I CTRL
40
5572
µA
T A =85o C 50T A =-40o C
75Schottky Forward Drop V DROP
索牌羽毛球拍I D =150mA 0.7V Schottky Leakage Current V R =23V 0.1
4µA
V R =27V
150
Soft Start Time
t 300µS Electrical Characteristics
烧烤步骤
Note 2: The Switch Current Limit is related to Duty Cycle. Plea refer to Figure 16 for detail.
AP30196
May 2007 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
Typical Performance Characteristics
Figure 6. Efficiency vs. LED's Number Figure 7. Schottky Forward Current
Figure 4. Efficiency vs. Junction Temperature Figure 5. Efficiency vs. Input Voltage
vs. Schottky Forward Drop大吉大利是什么意思
(V F of WLED is 3.45V @ I F =20mA, unless otherwi noted )
