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CAT32
Typical Application Circuit
VIN
2.7 V
to
4.2 V
C1
4.7 m F
6
L 1 6.8 m H
1
D1
C1: Taiyo Yuden JMK212BJ475
C2: Taiyo Yuden EMK212BJ105
D1: Zetez ZHCS400
L1: Sumida CLQ4D106R8
(Panasonic ELJEA6R8)
VIN
SW
TSOT ? 23 Pin Numbers
PWM
DIMMING
CONTROL
5
CAT32
SHDN
RSET
4
R SET
1.50 k W
LED
GND
2
3
15 mA
C2
1 m F
Figure 1. Li ? Ion Driver for Four High ? Brightness White LEDs
Table 1. PIN DESCRIPTION
Pin Number
Pin Number
SOT23
1
2
3
4
5
6
?
TDFN
8
5
6
4
3
2
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 m F capacitor mounted close to the pin is recommended.
Power Ground
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2
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