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LTC1879

Description
1.2A Synchronous Step-Down Regulator with 15mA Quiescent Current
File Size253KB,20 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LTC1879 Overview

1.2A Synchronous Step-Down Regulator with 15mA Quiescent Current

LTC1879
1.2A Synchronous
Step-Down Regulator with
15µA Quiescent Current
FEATURES
s
s
s
s
s
s
s
s
s
s
DESCRIPTIO
s
s
s
s
High Efficiency: Up to 95%
Low Quiescent Current: Only 15µA with No Load
550kHz Constant Frequency Operation
2.65V to 10V Input Voltage Range
V
OUT
from 0.8V to V
IN
, I
OUT
to 1.2A
True PLL Frequency Locking from 350kHz to 750kHz
Power Good Output Voltage Monitor
Low Dropout Operation: 100% Duty Cycle
Burst Mode
®
or Pulse Skipping Operation
Current Mode Operation for Excellent Line and Load
Transient Response
Shutdown Mode Draws < 1µA Supply Current
±2%
Output Voltage Accuracy
Overcurrent and Overtemperature Protected
Available in 16-Lead SSOP Package
The LTC
®
1879 is a high efficiency monolithic synchro-
nous buck regulator using a constant frequency, current
mode architecture. Operating supply current is only 15µA
with no load and drops to < 1µA in shutdown. The input
supply voltage range of 2.65V to 10V makes the LTC1879
ideally suited for both single and dual Li-Ion battery-pow-
ered applications. 100% duty cycle provides low dropout
operation, extending battery life in portable systems.
The switching frequency is internally set to 550kHz, allow-
ing the use of small surface mount inductors and capaci-
tors. For noise sensitive applications, the LTC1879 can be
externally synchronized from 350kHz to 750kHz. Burst
Mode operation is inhibited during synchronization or
when the SYNC/MODE pin is pulled low.
The internal synchronous rectifier switch increases effi-
ciency and eliminates the need for an external Schottky
diode. Low output voltages are easily supported with a
0.8V feedback reference voltage. The LTC1879 is available
in a 16-lead SSOP package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
APPLICATIO S
s
s
s
Cellular Telephones
Portable Computers
Wireless Modems
TYPICAL APPLICATIO
V
IN
2.65V TO 10V
C
IN
10µF
2
15
High Efficiency Step-Down Converter
13
SV
IN
RUN/SS
PV
IN
8, 9
5, 12
L1
6.2µH
Efficiency vs Output Load Current
100
90
80
V
IN
= 3.6V
EFFICIENCY (%)
SYNC/MODE
SWP
LTC1879
14
6, 11
PGOOD
SWN
150k
47pF
220pF
SGND
1
4
I
TH
PGND
V
FB
7, 10
3
70
V
IN
= 10V
60
50
40
Burst Mode OPERATION
V
OUT
= 3.1V
L = 6.2µH
1
10
100
OUPUT CURRENT (mA)
1000
1879 TA01b
V
OUT
*
3.1V
C
OUT
47µF
28.0k
80.6k
30
0.1
1879 TA01a
C
IN
: TAIYO YUDEN CERAMIC LMK325BJ106MN
C
OUT
: TDK CERAMIC C4532X5ROJ476M
L1: TOKO A921CY6R2M
*V
OUT
CONNECTED TO V
IN
(MINUS SWITCH AND L1 VOLTAGE DROP) FOR 2.65V < V
IN
< 3.1V
U
V
IN
= 7.2V
1879f
U
U
1

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