LTC1265-3.3_15 Datasheet, PDF (14/16 Pages) Linear Technology – 1.2A, High Efficiency Step-Down DC/DC Converter

LTC1265/LTC1265-3.3/LTC1265-5
TYPICAL APPLICATIO S
5V Buck-Boost Converter
V_IN (V)
3.5
4.0
5.0
6.0
7.0
7.5
I_OUT(MAX) (mA)
240
275
365
490
610
665
L1B
L1A
32
TOP VIEW
4 1^•
L1B
L1A
V_IN
3.5V TO 7.5V
75pF
3300pF
1k
*SANYO ^{OS-CON CAPACITOR}
**IRC ^{LRC2010-01-R162-J}
†L1A, L2A SELECTION
MANUFACTURER PART NO.
COILTRONICS
DALE
CTX33-4
LPT4545-330LA
2
1, 13
V_IN
4
LB_IN
PWR V_IN
14
SW
LTC1265
3
12
LB_OUT
PGND
5
C_T
11
SGND
+
0.1µF
10
SHDN SHDN
6
I_THR
7 _{SENSE –}
9
V_FB
SENSE^{+ 8}
0.01µF
C_IN*
100µF
16V
33µF
10V*
4
• _L1B††
33µH
3
R_SENSE**
0.162Ω
L1A^††
33µH
1
2
1N5818
V_OUT
5V
75k
+ _COUT*
100µF
10V
100pF ^25k
LTC1265 F09
9V to 12V and – 12V Outputs
V_IN (V)
4.0
5.0
6.0
7.0
8.0
9.0
10.0
11.0
12.0
I_OUT(MAX) (mA)
40
60
80
100
115
130
150
165
180
V_IN
4V TO 12V
75pF
L1B
L1A
32
TOP VIEW
4 1^•
L1B
L1A
3300pF
1k
*AVX TPSE686K020
**AVX TPSE336K025
†_{IRC LRC2010-01-R162-J}
††_{L1A,L2A SELECTION}
MANUFACTURER
COILTRONICS
DALE
PART NO.
CTX50-4
LPT4545-500LA
MBRS130LT3
2
V_IN
4
LB_IN
1, 13
PWR V_IN
14
SW
+
0.1µF
1N914
C_IN*
68µF
20V
33µF**
25V
LTC1265
3
12
LB_OUT
PGND
5
C_T
11
SGND
10
SHDN SHDN
SI19430DY
4
•
3
L1B^††
50µH
6
I_THR
9
V_FB
7 _{SENSE – SENSE+} 8
0.01µF
R_SENSE*
0.162Ω
L1A^††
50µH
1
2
MBRS130LT3
100pF
C_OUT*
68µF
20V
V_OUT
–12V
V_OUT
12V
301k
+ C_OUT*
68µF
20V
34k
LTC1265 TA05
14