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參數(shù)資料
| 型號(hào)： | AP3156FVG-7 |
| 廠商： | DIODES INC |
| 元件分類(lèi)： | 顯示驅(qū)動(dòng)器 |
| 中文描述： | LED DISPLAY DRIVER, QCC16 |
| 封裝： | 4 X 4 MM, GREEN, QFN-16 |
| 文件頁(yè)數(shù)： | 1/15頁(yè) |
| 文件大?。?/td> | 414K |
| 代理商： | AP3156FVG-7 |
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AP3156
HIGH EFFICIENCY 1X/1.5X/2X CHARGE PUMP
FOR WHITE LED APPLICATIONS
Features
AP3156 Rev. 1
SEPTEMBER 2009Diodes Incorporated
V
IN
Range: 2.7V to 5.5V
Fully Programmable Current with Single Wire
32-Step Logarithmic Scale
20/25mA Max Current per Channel
Four Low Current Settings Down to 50μA
Low I
Q
(50μA) for Low Current Mode
Tri-Mode 1X, 1.5X, and 2X Charge Pump for Maximum
Efficiency and V
F
Coverage
Drives up to Six Channels of LEDs
Individual Main/Sub-Group Control
No Inductors, Low Noise Operation
0.5/1/2MHz Constant Switching Frequency
Small Application Circuit
Built-In Thermal Protection
Built-In Auto-Disable For Open Circuit
Automatic Soft Start
I
Q
<1μA in Shutdown
Thermally-Enhanced QFN4040-16 Package: Available
in “Green” Molding Compound (No Br, Sb)
Lead Free Finish / RoHS Compliant (Note 1)
The AP3156 is a low noise, constant frequency charge pump
DC/DC converter that uses a tri-mode load switch (1X), fractional
(1.5X), and doubling (2X) conversion to maximize efficiency for
white LED applications. The AP3156 is capable of driving the
LED channels at 120mA maximum from a 2.7V to 5.5V input. The
current sinks may be operated individually or in parallel for driving
higher-current LEDs. A low external parts count (two 1μF flying
capacitors and two small 1μF capacitors at V
and V
) make
this part ideally suited for small, battery-powered applications.
AP3156 serial digital input is used to enable, disable and set
current for each LED with a 32-level logarithmic scale plus four
low-current settings down to 50μA for optimized efficiency, with a
low quiescent current of only 50μA.
Each output of the AP3156 is equipped with built-in protection for
V
short circuit and auto-disable for LED failure conditions.
Built-in soft-start circuitry prevents excessive inrush current
during start-up. A low-current shutdown feature disconnects the
load from V
IN
and reduces quiescent current to less than 1μA.
The AP3156 is available in a lead-free, space-saving, thermally
enhanced 16-pin 4x4mm QFN package.
Applications
Color (RGB) Lighting
Programmable Current Sinks
White LED Backlighting
White Photo Flash for Digital Still Cameras
Typical Application Circuit
V
IN
1uF
C
IN
AP3156
C2
P
C2
N
C1
P
C1
N
V
OUT
D4
D3
D1
D2
GND
SDI
SDI
2
10
V
IN
1uF
C
2
8
6
5
1uF
C
1
7
9,11
4
15
14
13
12
D6
LED
1
16
D5
LED
D4
LED
D3
LED
1uF
C
OUT
D5
D6
D2
LED
D1
LED
General Description
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