Datasheet
12
LTC1772
1772fb
LT/LT 0605 500 REV B • PRINTED IN USA
RELATED PARTS
© LINEAR TECHNOLOGY CORPORATION 1999
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
PART NUMBER DESCRIPTION COMMENTS
LTC1147 Series High Efficiency Step-Down Switching Regulator Controllers 100% Duty Cycle, 3.5V ≤ V
IN
≤ 16V
LT1375/LT1376 1.5A, 500kHz Step-Down Switching Regulators High Frequency, Small Inductor, High Efficiency
LTC1622 Low Input Voltage Current Mode Step-Down DC/DC Controller V
IN
2V to 10V, I
OUT
Up to 4.5A, Synchronizable to
750kHz Optional Burst Mode Operation, 8-Lead MSOP
LTC1624 High Efficiency SO-8 N-Channel Switching Regulator Controller N-Channel Drive, 3.5V ≤ V
IN
≤ 36V
LTC1625 No R
SENSE
TM
Synchronous Step-Down Regulator 97% Efficiency, No Sense Resistor
LTC1627 Low Voltage, Monolithic Synchronous Step-Down Regulator Low Supply Voltage Range: 2.65V to 8V, I
OUT
= 0.5A
LTC1649 3.3V Input Synchronous Controller No Need for 5V Supply, Uses Standard Logic Gate
MOSFETs; I
OUT
up to 15A
LTC1702 550kHz, 2 Phase, Dual Synchronous Controller Two Channels; Minimum C
IN
and C
OUT
, I
OUT
up to 15A
LTC1735 Single, High Efficiency, Low Noise Synchronous Switching Controller High Efficiency 5V to 3.3V Conversion at up to 15A
LTC1771 Ultra-Low Supply Current Step-Down DC/DC Controller 10µA Supply Current, 93% Efficiency,
1.23V ≤ V
OUT
≤ 18V; 2.8V ≤ V
IN
≤ 20V
LTC1872 SOT-23 Step-Up Controller 2.5V ≤ V
IN
≤ 9.8V; 550kHz; 90% Efficiency
No R
SENSE
is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIONS
U
LTC1772 3.3V to 5V/1A Boost Regulator
I
TH
/RUN
LTC1772
R4
10k
R1
0.033Ω
R2
422k
R3
80.6k
L1
4.7µH
M1
D1
C3
220pF
U1: FAIRCHILD NC7SZ04
GND
V
FB
6
3
42
5
5
4
1772 TA03
1
2
3
PGATE
V
IN
SENSE
–
C1
47µF
16V
× 2
V
OUT
5V
1A
V
IN
3.3V
C2
100µF
10V
× 2
+
U1
C1: AVXTPSE476M016R0047
C2: AVXTPSE107M010R0100
D1: IR10BQ015
L1: MURATA LQN6C-4R7
M1: Si9804
R1: DALE 0.25W
ALSO SEE LTC1872
FOR THIS APPLICATION
LTC1772 5V/0.5A Flyback Regulator
I
TH
/RUN
LTC1772
R4
10k
R1
0.033Ω
10µH10µH
R2
52.3k
R3
10k
M1
D1
T1
C3
220pF
C1: AVXTPSE476M016R0047
C2: AVXTPSE107M010R0100
D1: IR10BQ015
M1: Si9803
R1: DALE 0.25W
T1: COILTRONICS CTX10-4
GND
V
FB
6
5
4
•
•
1772 TA04
1
2
3
PGATE
V
IN
SENSE
–
V
IN
2.5V
TO 9.8V
V
OUT
5V
0.5A
C2
100µF
10V
×2
C2
47µF
16V
×2
C5
150pF
CERAMIC
R6
100Ω
+
C4
100pF
CERAMIC
R5
22Ω