LT1765/LT1765-1.8/LT1765-2.5/
LT1765-3.3/LT1765-5
APPLICATIONS INFORMATION
D2
CMDSH-3
C2
0.18μF
L1A*
BOOST
OUTPUT
INPUT
12V
V
V
IN
SW
FB
5V AT 1.5A
LT1765-5
SHDN
SYNC GND
4.7μF
6.3V
CERAMIC
V
C
C3
2.2μF
25V
R
3.3k
C
D1
C
C
CERAMIC
4700pF
GND
C4
4.7mF
6.3V
4.7μF
16V
CERAMIC
L1B*
CERAMIC
OUTPUT
†
–5V AT 1.1A
* L1 IS A SINGLE CORE WITH TWO WINDINGS
COILTRONICS CTX5-1A
D3
1765 F11a
†
IF LOAD CAN GO TO ZERO, AN OPTIONAL
PRELOAD OF 1k TO 5k MAY BE USED TO
IMPROVE LOAD REGULATION
D1, D3: B220A
Figure 11a. Dual Output Converter
1200
1000
800
600
400
200
0
10
100
1000
10000
5V LOAD CURRENT (mA)
1765 F11b
Figure 11b. Dual Output Converter (Output Currents)
1765fd
16
Linear [ Linear ]
