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LT1375C Datasheet

  • LT1375C

  • Linear Technology [1.5A, 500kHz Step-Down Switching Regulat...

  • LINER

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LT1375/LT1376
1.5A, 500kHz Step-Down
Switching Regulators
FEATURES
s
s
s
s
s
s
s
s
Constant 500kHz Switching Frequency
Easily Synchronizable
Uses All Surface Mount Components
Inductor Size Reduced to 5
碌
H
Saturating Switch Design: 0.4鈩?/div>
Effective Supply Current: 2.5mA
Shutdown Current: 20碌A(chǔ)
Cycle-by-Cycle Current Limiting
is current mode for fast transient response and good loop
stability. Both fixed output voltage and adjustable parts are
available.
A special high speed bipolar process and new design
techniques achieve high efficiency at high switching fre-
quency. Efficiency is maintained over a wide output cur-
rent range by using the output to bias the circuitry and by
utilizing a supply boost capacitor to saturate the power
switch. A shutdown signal will reduce supply current to
20碌A(chǔ) on both parts. The LT1375 can be externally syn-
chronized from 550kHz to 1MHz with logic level inputs.
The LT1375/LT1376 fit into standard 8-pin PDIP and SO
packages, as well as a fused lead 16-pin SO with much
lower thermal resistance. Full cycle-by-cycle short-cir-
cuit protection and thermal shutdown are provided.
Standard surface mount external parts are used, includ-
ing the inductor and capacitors.
For low input voltage applications with 3.3V output, see
LT1507. This is a functionally identical part that can
operate with input voltages between 4.5V and 12V.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s
s
s
s
Portable Computers
Battery-Powered Systems
Battery Charger
Distributed Power
DESCRIPTIO
The LT
廬
1375/LT1376 are 500kHz monolithic buck mode
switching regulators. A 1.5A switch is included on the die
along with all the necessary oscillator, control and logic
circuitry. High switching frequency allows a considerable
reduction in the size of external components. The topology
TYPICAL APPLICATIO
5V Buck Converter
D2
1N914
C2
0.1碌F
V
SW
LT1376-5 BIAS
DEFAULT
= ON
SHDN
GND
FB
V
C
C
C
3.3nF
D2
1N5818
L1**
5碌H
6V
鈥?/div>
TO 25V
C3*
10碌F TO
50碌F
+
V
IN
EFFICIENCY (%)
INPUT
BOOST
* RIPPLE CURRENT
鈮?/div>
I
OUT
/2
** INCREASE L1 TO 10碌H FOR LOAD CURRENTS ABOVE 0.6A AND TO 20碌H ABOVE 1A
鈥?/div>
FOR INPUT VOLTAGE BELOW 7.5V, SOME RESTRICTIONS MAY APPLY.
SEE APPLICATIONS INFORMATION.
U
U
U
Efficiency vs Load Current
100
V
OUT
= 5V
V
IN
= 10V
L = 10碌H
90
OUTPUT**
5V, 1.25A
80
+
C1
100碌F, 10V
SOLID
TANTALUM
70
60
50
0
1375/76 TA01
0.25
0.75
1.00
0.50
LOAD CURRENT (A)
1.25
1375/76 TA02
1

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