LTC1779 LINER [Linear Technology], LTC1779 Datasheet - Page 12

• Manufacturer Part Number: LTC1779
• Description: 250mA Current Mode Step-Down DC/DC Converter in ThinSOT
• Manufacturer: LINER [Linear Technology]

LTC1779
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PART NUMBER
LT
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LT1676/LT1776
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LTC1877
LTC1878
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LTC3401
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No R
12
TYPICAL APPLICATIONS
®
1375/LT1376
SENSE
is a trademark of Linear Technology Corporation.
20k
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] FAX: [phone]
100pF
Single Li-Ion to 1.8V/250mA Step-Down Converter
DESCRIPTION
1.5A, 500kHz Step-Down Switching Regulators
600mA Step-Down Switching Regulator
High Efficiency SO-8 N-Channel Switching Regulator Controller
No R
Low Voltage, Monolithic Synchronous Step-Down Regulator
Wide Input Range Step-Down Switching Regulators
Single, High Efficiency, Low Noise Synchronous Switching Controller High Efficiency 5V to 3.3V Conversion at up to 15A
1.5A, 1.4MHz Step-Down DC/DC Converter
Ultralow Supply Current Step-Down DC/DC Controller
Constant Frequency Current Mode Step-Down DC/DC Controller
95% Efficient Synchronous Step-Down Controller
High Efficiency Monolithic Step-Down Regulator
High Efficiency Monolithic Step-Down Regulator
1.2MHz Synchronous Step-Up DC/DC Converter in ThinSOT
Single Cell, High Current (1A), Micropower, Synchronous 3MHz
Step-Up DC/DC Converter
Single Cell, High Current (2A), Micropower, Synchronous 3MHz
Step-Up DC/DC Converter
1.4MHz High Efficiency, Monolithic Synchronous Step-Down
Regulator
C1: TAIYO YUDEN CERAMIC EMK325BJ106MNT
C2: SANYO POSCAP 6TPA47M
D1: IR10BQ015
L1: COILTRONICS UP1B100
1
2
3
SENSE
LTC1779 Minimal Component Count,
I
GND
V
TH
FB
/RUN
LTC1779
TM
Synchronous Step-Down Regulator
SENSE
SW
V
IN
–
6
5
4
U
www.linear.com
D1
10 H
L1
+
C1
10 F
16V
C2
47 F
6V
1779 TA01a
100k
80.6k
V
2.7V
TO 4.2V
V
1.8V
250mA
IN
OUT
COMMENTS
High Frequency, Small Inductor, High Efficiency
1.4MHz, 4V to 25V Input, ThinSOT Package
8-Pin N-Channel Drive, 3.5V V
High Efficiency, No Sense Resistor
Low Supply Voltage Range: 2.65V to 8V, I
60V Input, 700mA Internal Switches
Higher Current, 8-Lead MSOP Package
10 A I
2.8V V
V
2.65V V
550kHz, MS8, V
I
550kHz, MS8, V
I
92% Efficiency, V
V
Oscillator from 100kHz to 3MHz
V
Oscillator from 100kHz to 3MHz
Up to 95% Efficiency, 100% Duty Cycle, I
V
OUT
OUT
IN
IN
IN
IN
= 2.5V to 9.8V, I
= 0.5V to 5V, Up to 97% Efficiency Synchronizable
= 0.7V to 5V, Up to 95% Efficiency Synchronizable
= 2.65V to 6V
to 600mA at V
to 600mA at V
Q
, 93% Efficiency, 1.23V V
IN
100
IN
95
90
85
80
75
70
65
60
55
50
0.1
20V
8.5V, 0.8V V
IN
IN
V
IN
Efficiency vs Load Current
IN
Up to 10V, I
Up to 6V, I
IN
IN
OUT
= 0.5V to 6V, V
= 3.6V
= 5V
= 3.3V
1
LOAD CURRENT (mA)
Up to 2A, ThinSOT Package
V
LINEAR TECHNOLOGY CORPORATION 2000
IN
OUT
Q
V
= 2.7V
Q
1779f LT/TP 0701 2K • PRINTED IN USA
IN
= 10 A,
10
IN
= 10 A,
= 4.2V
OUT
V
OUT
IN
36V
, Current Mode, 550kHz
= 2.6V to 5V
18V,
V
R
Q
100
OUT
OUT
SENSE
= 10 A,
= 0.5A
= 1.8V
1779 TA01b
= 0
1k