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LTC1148L Datasheet

  • LTC1148L

  • Linear Technology [High Efficiency Synchronous Step-Down Sw...

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LTC1148
LTC1148-3.3/LTC1148-5
High Efficiency Synchronous
Step-Down Switching Regulators
FEATURES
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
s
s
Ultrahigh Efficiency: Over 95% Possible
Current-Mode Operation for Excellent Line and Load
Transient Response
High Efficiency Maintained Over Three Decades of
Output Current
Low 160碌A Standby Current at Light Loads
Logic Controlled Micropower Shutdown: I
Q
< 20碌A
Wide V
IN
Range: 3.5V* to 20V
Short-Circuit Protection
Very Low Dropout Operation: 100% Duty Cycle
Synchronous FET Switching for High Efficiency
Adaptive Nonoverlap Gate Drives
Output Can Be Externally Held High in Shutdown
Available in 14-Pin Narrow SO Package
The LTC
廬
1148 series is a family of synchronous step-
down switching regulator controllers featuring automatic
Burst Mode
TM
operation to maintain high efficiencies at
low output currents. These devices drive external comple-
mentary power MOSFETs at switching frequencies up to
250kHz using a constant off-time current-mode architec-
ture providing constant ripple current in the inductor.
The operating current level is user-programmable via an
external current sense resistor. Wide input supply range
allows operation from 3.5V* to 18V (20V maximum).
Constant off-time architecture provides low dropout regu-
lation limited by only the R
DS(ON)
of the external MOSFET
and resistance of the inductor and current sense resistor.
The LTC1148 series combines synchronous switching for
maximum efficiency at high currents with an automatic low
current operating mode, called Burst Mode operation, which
reduces switching losses. Standby power is reduced to only
2mW at V
IN
= 10V (at I
OUT
= 0). Load currents in Burst Mode
operation are typically 0mA to 300mA.
For operation up to 48V input, see the LTC1149 and
LTC1159 data sheets and Application Note 54.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
* LTC1148L and LTC1148L-3.3 only.
APPLICATI
s
s
s
s
s
s
S
Notebook and Palmtop Computers
Portable Instruments
Battery-Operated Digital Devices
Cellular Telephones
DC Power Distribution Systems
GPS Systems
TYPICAL APPLICATI
+
1碌F
V
IN
P-DRIVE
LTC1148HV-5
SHUTDOWN
SENSE
+
I
TH
SENSE
鈥?/div>
C
T
N-DRIVE
PGND
SGND
V
IN
(5.2V TO 18V)
+
P-CHANNEL
Si4431DY
L*
62碌H
C
IN
100碌F
95
V
OUT
5V/2A
0V = NORMAL
>1.5V = SHUTDOWN
EFFICIENCY (%)
R
SENSE
**
0.05鈩?/div>
1000pF
N-CHANNEL
Si4412DY
D1
MBRS140T3
R
C
1k
C
C
3300pF
+
C
T
470pF
C
OUT
390碌F
LT1148 鈥?TA01
*COILTRONICS CTX62-2-MP
**KRL SL-1-C1-0R050J
Figure 1. High Efficiency Step-Down Converter
U
LTC1148-5 Efficiency
100
V
IN
= 6V
V
IN
= 10V
90
85
80
0.02
0.2
LOAD CURRENT (A)
2
LTC1148 鈥?TA01
UO
UO
1

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