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LTC1875 Datasheet

  • LTC1875

  • 15mA Quiescent Current 1.5A Monolithic Synchronous Step-Down...

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LTC1875
15碌A(chǔ) Quiescent Current
1.5A Monolithic Synchronous
Step-Down Regulator
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 15碌A(chǔ) with No Load
550kHz Constant Frequency Operation
2.65V to 6V Input Voltage Range
V
OUT
from 0.8V to V
IN
, I
OUT
to 1.5A
True PLL Frequency Locking from 350kHz to 750kHz
Power Good Output Voltage Monitor
Low Dropout Operation: 100% Duty Cycle
Burst Mode
廬
or Pulse Skipping Operation
Current Mode Operation for Excellent Line and Load
Transient Response
Shutdown Mode Draws < 1碌A(chǔ) Supply Current
鹵2%
Output Voltage Accuracy
Overcurrent and Overtemperature Protected
Available in 16-Lead SSOP Package
The LTC
廬
1875 is a high efficiency 1.5A monolithic syn-
chronous buck regulator using a constant frequency,
current mode architecture. Operating supply current is
only 15碌A(chǔ) with no load and drops to < 1碌A(chǔ) in shutdown.
The input supply voltage range of 2.65V to 6V makes the
LTC1875 ideally suited for single Li-Ion battery-powered
applications. 100% duty cycle provides low dropout op-
eration, 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 LTC1875 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 switch increases efficiency and
eliminates the need for an external Schottky diode. Low
output voltages are easily supported with a 0.8V feedback
reference voltage. The LTC1875 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
Portable Computers
Portable Instruments
Wireless Modems
TYPICAL APPLICATIO
V
IN
2.65V TO 6V
C
IN
22碌F
High Efficiency Step-Down Converter
Efficiency vs Output Load Current
100
SV
IN
RUN/SS
PV
IN
EFFICIENCY (%)
SYNC/MODE SWP
LTC1875
PGOOD
SWN
150k
I
TH
47pF
220pF
SGND
PGND
88.7k
V
FB
28.0k
1875 TA01
95
90
L1
6.8碌H
85
80
75
70
65
60
55
0.1
V
OUT
*
3.3V
+
C
OUT
47碌F
C
IN
: TAIYO YUDEN CERAMIC JMK325BJ226MM
C
OUT
: SANYO POSCAP 6TPA47M
L1: TOKO 646CY-6R8M
*V
OUT
CONNECTED TO V
IN
(MINUS SWITCH AND L1 VOLTAGE DROP) FOR 2.65V < V
IN
< 3.3V
U
V
IN
= 3.6V
V
IN
= 4.2V
V
IN
= 6V
Burst Mode OPERATION
V
OUT
= 3.3V
L = 6.8碌H
1
10
100
OUPUT CURRENT (mA)
1000
1875 TA01a
U
U
1875f
1

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