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NCP5030
Buck-Boost Converter
to Drive a Single LED from 1
Li-Ion or 3 Alkaline
Batteries
The NCP5030 is a fixed frequency PWM buck ? boost converter
optimized for constant current applications such as driving
http://onsemi.com
high ? powered white LED. The buck ? boost is implemented in an
H ? bridge topology and has an adaptive architecture where it operates
in one of three modes: boost, buck ? boost, or buck depending on the
input and output voltage condition. This device has been designed
with high ? efficiency for use in portable applications and is capable
of driving in DC up to 900 mA into a high power LED for flashlight /
torch applications. To protect the device cycle ? by ? cycle current
1
12
WDFN12 3x4
MT SUFFIX
CASE 506AY
1
MARKING
DIAGRAM
5030
AYWW G
G
limiting and a thermal shutdown circuit have been incorporated as
well as output over ? voltage protection. The 700 kHz switching
frequency allows the use of a low value 4.7 m H and ceramic
capacitors. The NCP5030 is housed in a low profile space efficient
3x4 mm thermally enhanced WDFN.
Features
? Efficiency: 87% at 500 mA and 3.3 V V IN
? Internal Synchronous Rectifier, No Schottky Diodes
? Adjustable Switching Limit Current to Optimize inductor size
? 0.3 m A Shut ? down Control with “True ? Cut off”
? Input Voltage Range from 2.7 V to 5.5 V
? 200 mV Feedback Voltage
? Output Over ? voltage and Thermal Shut Down Protection
5030 = Specific Device Code
A = Assembly Location
Y = Year
WW = Work Week
G = Pb ? Free Package
(Note: Microdot may be in either location)
PIN CONNECTIONS
FB 1 12 PCA
COMP 2 11 AGND
CTRL 3 10 VIN
Typical Applications
? Portable Flashlight / Torch Lights
PVIN
4
13
9
VS
Vin
1 Cell
Li ? Ion
2.7 to 5.5
Cin
1 m F
C2
10 m F
C in
4.7 m H
L1
LX1
LX1
5
6
(Top View)
8
7
VOUT
LX2
39 k
R1
PCA
VOUT
C3
22 m F
D1
Exposed pad (Pin 13) is PGND
must be soldered to PCB GND plane
ENABLE
VS
CTRL
NCP5030
C out
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 13 of this data sheet.
L1: TDK RLF7030T ? 4R7M3R4
C1: 1 m F 6.3 V X5R
C2: 10 m F 3.6 V 0805
TDK: C2012X5R0J106MT
C3: 22 m F 6.3 V X5R
TDK: C2012X5R0J226MTJ
C4
22 pF
R2
100 k
C5
330 pF
R3
220 m
R SENSE
Figure 1. Typical Application Circuit
? Semiconductor Components Industries, LLC, 2010
January, 2010 ? Rev. 2
1
Publication Order Number:
NCP5030/D
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