Datasheet

LTC1772B
16
1772bfa
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
●
FAX: [phone]
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www.linear.com
© LINEAR TECHNOLOGY CORPORATION 1999
LT 0508 REV A • PRINTED IN USA
RELATED PARTS
TYPICAL APPLICATION
PART NUMBER DESCRIPTION COMMENTS
LT1375/LT1376 1.5A, 500kHz Step-Down Switching Regulators High Frequency, Small Inductor, High Effi ciency
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 Effi ciency 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% Effi ciency, 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 Step-Down 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 Effi ciency, Low Noise Synchronous Switching
Controller
High Effi ciency 5V to 3.3V Conversion at up to 15A
LTC1771 Ultra-Low Supply Current Step-Down DC/DC Controller 10μA Supply Current, 93% Effi ciency, 1.23V ≤ V
OUT
≤ 18V;
2.8V ≤ V
IN
≤ 20V
LTC1772 Constant Frequency Current Mode Step-Down
DC/DC Controller in SOT-23
With Burst Mode Operation for Higher Effi ciency at Light Load
Current
LTC1773 95% Effi cient Synchronous Step-Down Controller 2.65V ≤ V
IN
≤ 8.5V; 0.8V ≤ V
OUT
≤ V
IN
; Current Mode; 550kHz
LTC1872 SOT-23 Step-Up Controller 2.5V ≤ V
IN
≤ 9.8V; 550kHz; 90% Effi ciency
No R
SENSE
is a trademark of Linear Technology Corporation.
LTC1772B 3.3V to 5V/1A Boost Regulator
I
TH
/RUN
LTC1772B
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