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CAT32 Datasheet

CMOS White LED Driver

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CAT32 pdf
CAT32
CMOS White LED Driver
Description
The CAT32 is a DC/DC step up converter that delivers a regulated
output current. Operation at a constant switching frequency of
1.2 MHz allows the device to be used with very small value external
inductor and ceramic capacitors.
The CAT32 is targeted to drive multiple white light−emitting diodes
(LEDs) connected in series and provides the necessary regulated current
to control the brightness and the color purity. An external resistor RSET
controls the output current level. LED currents of up to 40 mA can be
supported over a wide range of input supply voltages from 2 V to 7 V,
making the device ideal for battery−powered applications.
A high voltage output stage allows up to 4 White LEDs to be driven
in series. Series drive provides inherent current matching.
LED dimming can be done by using a DC voltage, a logic signal, or
a pulse width modulation (PWM) signal. The shutdown input pin
allows the device to be placed in power−down mode with “near zero”
quiescent current.
In addition to overcurrent limiting protection, the device also
includes detection circuitry to ensure protection against open−circuit
load fault conditions.
The device is available in a low profile (1 mm max height) 6−lead
TSOT−23 package.
Features
Low Quiescent Ground Current (0.5 mA Typical)
Power Efficiency Over 80%
Compatible Pinout with LT1932
Adjustable Output Current (up to 40 mA)
High Frequency 1.2 MHz Operation
Input Voltage Operation down to 2.0 V
Low Resistance (0.5 W) High Voltage Power Switch
Drives up to 4 White LEDs in Series
Shutdown Current Less than 1 mA
Load Fault Protection Against Open−circuits
Low Value External Components
Low Profile (1 mm) TSOT−23 6−lead Package
These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
Applications
Color LCD and Keypad Backlighting
Cellular Phones
Handheld Terminals
Digital Cameras
PDAs/Games
Portable MP3 Players
http://onsemi.com
1
TSOT−23
TD SUFFIX
CASE 419AF
PIN CONNECTIONS
1
SW
VIN
GND
SHDN
LED RSET
TSOT−23
1 mm Maximum Height
qJA = 250°C/W (free air)
(Top View)
MARKING DIAGRAMS
VFYM
VF = CAT32TDI−GT3
Y = Production Year (Last Digit)
M = Production Month (1−9, A, B, C)
ORDERING INFORMATION
Device
Package
Shipping
CAT32TDI−GT3
TSOT−23
(Pb−Free)
3,000/
Tape & Reel
© Semiconductor Components Industries, LLC, 2014
April, 2014 − Rev. 5
1
Publication Order Number:
CAT32/D


  ON Semiconductor Electronic Components Datasheet  

CAT32 Datasheet

CMOS White LED Driver

No Preview Available !

CAT32 pdf
CAT32
Typical Application Circuit
VIN
2.7 V
to
4.2 V
C1
4.7 mF
L1 6.8 mH
D1
61
VIN SW
PWM
DIMMING
CONTROL
TSOT−23 Pin Numbers
CAT32
5
SHDN
3
LED
RSET
4
RSET
1.50 kW
GND
2
15 mA
C1: Taiyo Yuden JMK212BJ475
C2: Taiyo Yuden EMK212BJ105
D1: Zetez ZHCS400
L1: Sumida CLQ4D106R8
(Panasonic ELJEA6R8)
C2
1 mF
Figure 1. Li−Ion Driver for Four High−Brightness White LEDs
Table 1. PIN DESCRIPTION
Pin Number
SOT23
Pin Number
TDFN
18
25
36
44
53
62
−1
Name
SW
GND
LED
RSET
SHDN
VIN
Power
Ground
Function
Switch pin. This is the drain of the internal power switch. For minimum EMI, min-
imize the trace area connected to this pin.
Ground pin. Connect pin 2 to ground.
LED (cathode) connection pin.
RESET pin. A resistor connected from pin 4 to ground sets the LED current. This
pin is also used to dim the LEDs.
Shutdown pin.
Input supply pin. This pin should be bypassed with a capacitor to ground. A
4.7 mF capacitor mounted close to the pin is recommended.
Power Ground
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2


Part Number CAT32
Description CMOS White LED Driver
Maker ON Semiconductor
Total Page 11 Pages
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