Datasheet

12
LTC1779
1779f LT/TP 0701 2K • PRINTED IN USA
RELATED PARTS
PART NUMBER DESCRIPTION COMMENTS
LT
®
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LT1616 600mA Step-Down Switching Regulator 1.4MHz, 4V to 25V Input, ThinSOT Package
LTC1624 High Efficiency SO-8 N-Channel Switching Regulator Controller 8-Pin N-Channel Drive, 3.5V ≤ V
IN
≤ 36V
LTC1625 No R
SENSE
TM
Synchronous Step-Down Regulator High Efficiency, No Sense Resistor
LTC1627 Low Voltage, Monolithic Synchronous Step-Down Regulator Low Supply Voltage Range: 2.65V to 8V, I
OUT
= 0.5A
LT1676/LT1776 Wide Input Range Step-Down Switching Regulators 60V Input, 700mA Internal Switches
LTC1735 Single, High Efficiency, Low Noise Synchronous Switching Controller High Efficiency 5V to 3.3V Conversion at up to 15A
LT1767 1.5A, 1.4MHz Step-Down DC/DC Converter Higher Current, 8-Lead MSOP Package
LTC1771 Ultralow Supply Current Step-Down DC/DC Controller 10µA I
Q
, 93% Efficiency, 1.23V ≤ V
OUT
≤ 18V,
2.8V ≤ V
IN
≤ 20V
LTC1772 Constant Frequency Current Mode Step-Down DC/DC Controller V
IN
= 2.5V to 9.8V, I
OUT
Up to 2A, ThinSOT Package
LTC1773 95% Efficient Synchronous Step-Down Controller 2.65V ≤ V
IN
≤ 8.5V, 0.8V ≤ V
OUT
≤ V
IN
, Current Mode, 550kHz
LTC1877 High Efficiency Monolithic Step-Down Regulator 550kHz, MS8, V
IN
Up to 10V, I
Q
= 10µA,
I
OUT
to 600mA at V
IN
= 5V
LTC1878 High Efficiency Monolithic Step-Down Regulator 550kHz, MS8, V
IN
Up to 6V, I
Q
= 10µA,
I
OUT
to 600mA at V
IN
= 3.3V
LTC3400 1.2MHz Synchronous Step-Up DC/DC Converter in ThinSOT 92% Efficiency, V
IN
= 0.5V to 6V, V
OUT
= 2.6V to 5V
LTC3401 Single Cell, High Current (1A), Micropower, Synchronous 3MHz V
IN
= 0.5V to 5V, Up to 97% Efficiency Synchronizable
Step-Up DC/DC Converter Oscillator from 100kHz to 3MHz
LTC3402 Single Cell, High Current (2A), Micropower, Synchronous 3MHz V
IN
= 0.7V to 5V, Up to 95% Efficiency Synchronizable
Step-Up DC/DC Converter Oscillator from 100kHz to 3MHz
LTC3404 1.4MHz High Efficiency, Monolithic Synchronous Step-Down Up to 95% Efficiency, 100% Duty Cycle, I
Q
= 10µA,
Regulator V
IN
= 2.65V to 6V
No R
SENSE
is a trademark of Linear Technology Corporation.
 LINEAR TECHNOLOGY CORPORATION 2000
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
●
FAX: [phone]
●
www.linear.com
TYPICAL APPLICATIONS
U
LTC1779 Minimal Component Count,
Single Li-Ion to 1.8V/250mA Step-Down Converter
Efficiency vs Load Current
I
TH
/RUN
LTC1779
20k
100k
80.6k
L1
10µH
D1
100pF
GND
V
FB
6
5
4
1779 TA01a
1
2
3
SW
V
IN
SENSE
–
C1
10µF
16V
V
IN
2.7V
TO 4.2V
V
OUT
1.8V
250mA
C2
47µF
6V
+
C1: TAIYO YUDEN CERAMIC EMK325BJ106MNT
C2: SANYO POSCAP 6TPA47M
D1: IR10BQ015
L1: COILTRONICS UP1B100
LOAD CURRENT (mA)
65
EFFICIENCY (%)
95
100
60
55
90
75
85
80
70
0.1 10 100 1k
1779 TA01b
50
1
V
IN
= 2.7V
V
OUT
= 1.8V
R
SENSE
= 0Ω
V
IN
= 4.2V
V
IN
= 3.6V