LTC1626_15 Datasheet, PDF (12/12 Pages) Linear Technology – Low Voltage, High Efficiency Step-Down DC/DC Converter

LTC1626
TYPICAL APPLICATIONS
Single Li-Ion to 3.3V Buck-Boost Converter
L1B
L1A
3
2
TOP VIEW
4
1
L1B
L1A
(V_IN = 2.5V TO 4.2V)
SINGLE ₊
Li-ION
CELL
PWR V_IN
LBI
LBO
V_IN
SW
MANUFACTURER
COILTRONICS
DALE
V_IN (V)
2.5
3.0
3.5
PART NO.
CTX33-4
LPT4545-330LA
I_OUT (mA)
200
350
500*
SHUTDOWN
1k
C_T
3900pF
75pF
SHDN
PGND
LTC1626
I_TH
C_T
SENSE^–
V_FB
SGND
SENSE⁺
4.0
500*
4.2
500*
*DESIGN LIMIT
* IRC 1206-R100F
† _{AVX TPSE107M016R0100}
†† _{AVX TPSD107M010R0065}
+
0.1µF
C_IN†
100µF
16V
100µF^†
16V
+
4
L1B
33µH
3
1000pF
R_SENSE*
0.1Ω
L1A
33µH
D1 ¹
2
MBRS130LT1
100pF
V_OUT
3.3V
15k ₊
1%
9.09k
1%
C_{OUT†â€} 
100µF
10V
1626 TA05
V_IN
5V
PWR V_IN
LBI
LBO
V_IN
SW
SHUTDOWN
1k
3900pF
C_T
270pF
SHDN
PGND
LTC1626
I_TH
SENSE⁺
SENSE ^–
C_T
V_FB
SGND
* COILCRAFT DO3316-473
** IRC 1206-R100F
† _{AVX TPSD107K010}
†† _{AVX TPSE227K010}
5V to 3.3V Converter
+
0.1µF
C_IN†
100µF
10V
L1*
47µH
R_SENSE**
0.1Ω
D1
MBRS130LT1
1000pF
100pF
V_OUT
3.3V
0.5A
+
15k
1%
C_{OUT†â€} 
220µF
10V
9.09k
1%
1626 TA04
RELATED PARTS
PART NUMBER
LTC1174/LTC1174-3.3
LTC1174-5
LTC1265
LT1375/LT1376
LTC1435
LTC1436/LTC1436-PLL
LTC1438/LTC1439
LTC1474/LTC1475
DESCRIPTION
High Efficiency Step-Down and Inverting DC/DC Converters
COMMENTS
Monolithic Switching Regulators, Burst Mode Operation
1.2A, High Efficiency Step-Down DC/DC Converter
Constant Off-Time Monolithic, Burst Mode Operation
1.5A, 500kHz Step-Down Switching Regulators
High Frequency, Small Inductor, High Efficiency
High Efficiency, Low Noise, Synchronous Step-Down Converter 16-Pin Narrow SO and SSOP
High Efficiency, Low Noise, Synchronous Step-Down Converters 24-Pin Narrow and 28-Pin SSOP
Dual, Low Noise, Synchronous Step-Down Converters
Multiple Output Capability
Low Quiescent Current Step-Down DC/DC Converters
Monolithic, I_Q = 10µA, 8-Pin MSOP
12 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417^q [phone]
FAX: [phone]^q TELEX: 499-3977 ^q www.linear-tech.com
1626f LT/TP 0398 4K • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 1997