NCP5008 Datasheet, PDF (1/20 Pages) ON Semiconductor – Backlight LED Boost Driver

NCP5008, NCP5009
Backlight LED Boost Driver
The NCP5008/NCP5009 is a high efficiency boost converter
operating in current loop control mode to drive Light Emitting
Diode. The current mode regulation allows a uniform brightness of
the LEDs.
Features
• 2.7 to 6.0 V Input Voltage Range
• Output Voltage from V_bat to 15 V
• 3.0 mA Quiescent Supply Current
• Automatically LEDs Current Matching
• No External Sense Resistor
• Includes Dimming Function
• Programmable or Automatic Current Output Mode
• LOCAL or REMOTE Control Facility
• Photo Transistor Sense Feedback Input
• Inductor Based Converter brings High Efficiency
• Low Noise DC/DC Converter
• All Pins are Fully ESD Protected
Typical Applications
• LED Display Back Light Control
• High Efficiency Step Up Converter
R1
30 k
GND
U1
1 _Iref
2
PHOTO
V_bat
C1
V_bat ¹⁰
9
L1
10 mF/6.3 V
GND
Q1
NPN−PHOTO
V_bat
GND
Vcc
4
3
5
VBIAS
CS
CLK
NCP5009
D1
D2
8
L2
7
GND
6
LOCAL
D3
D4
L1
22 mH
D5 MBR0520
GND
http://onsemi.com
MARKING
DIAGRAM
10
1
Micro 10
DM SUFFIX
CASE 846B
5Tx
AYW
x = Device Number 8 or 9
A = Assembly Location
Y = Year
W = Work Week
PIN CONNECTIONS
I_ref 1
NC ₂
CS 3
VBIAS 4
CLOCK 5
10 V_bat
9 L1
8 L2 Iout
7 GND
6 LOCAL
NCP5008
I_ref 1
Photo ₂
CS 3
VBIAS 4
CLOCK 5
10 V_bat
9 L1
8 L2 Iout
7 GND
6 LOCAL
NCP5009
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 18 of this data sheet.
LED
LED
LED
LED
GND
C2
GND
2.2 mF/16 V
Figure 1. Typical Battery Powered LED Boost Driver
© Semiconductor Components Industries, LLC, 2003
1
August, 2003 − Rev. 4
Publication Order Number:
NCP5008/D