NCP5021 Datasheet, PDF (1/17 Pages) ON Semiconductor – High Voltage White LED Driver with Ambient Light Sensing

NCP5021
High Voltage White LED
Driver with Ambient Light
Sensing
The NCP5021 product is a single output boost LED driver capable
of driving up to 8 LEDs in series for portable backlight applications.
The built−in DC/DC converter is based on a high efficient PWM
boost structure with 32 V output voltage span. It provides a peak 90%
efficiency together with a 1% I−LED current tolerance.
Features
• 2.7 to 5.5 V Input Voltage Range
• 90% Peak efficiency with 4.7 mH / 150 mW Inductor
• Gradual Dimming Built−in (Automatic Fade In/Fade Out Effect)
• Integrated Ambient Light Sensing Automatically Adjusts the LCD
Backlight Contrast
• Built−in Zero Current Load Leakage under Idle Mode
• Support the Full I2C Protocol with Address Extension
• Tight 1% I−LED Tolerance
• Ultra Thin 0.5 mm QFN16 Package
• This is a Pb−Free Device
Typical Applications
• Cellular Phone, Smartphone
• Portable Media Player (PMP)
• Global Positioning System (GPS)
+Vbat
L1
NSR0240M2T5G
GND ^C1
4.7mH
D8
D1
4.7mF/6.3V ¹⁵ _Vbat
Lx ¹³
D2
SCL
SDA
1 _SCL
2 _SDA
Vos ^{16 R3}
470R
D3
GND
SFH5711 U3
Log
4
C3
100nF
R3
3 _I2CADR
4 _VSB
U1
R4 ^{22k GND}
NCP5021
C2
D4
GND
D5
220k
5 _AMBS
D6
12
C4
2.2mH
R1
7 _IREF
NC 12
NC 11
D7
12k _{R2 6 IPK}
NC 10
D8
GND
22k
GND GND FB ⁹
8 14
GND
Figure 1. Typical Large Display LED Driver
http://onsemi.com
1
UQFN16
MU SUFFIX
CASE 523AF
MARKING DIAGRAM
5021
ALYWG
G
5021
A
L
Y
W
G
= Specific Device Code
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
(Note: Microdot may be in either location)
PIN CONNECTIONS
SCL
NC
SDA
NC
I2CADR
NC
VSB
FB
(Top View)
NC = Not Connected
ORDERING INFORMATION
Device
Package
Shipping^†
NCP5021MUTXG UQFN16 3000 / Tape & Reel
(Pb−Free)
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
© Semiconductor Components Industries, LLC, 2009
1
May, 2009 − Rev. 0
Publication Order Number:
NCP5021/D