LT1375 Linear Technology, LT1375 Datasheet
LT1375
Manufacturer Part Number
LT1375
Description
1.5A/ 500kHz Step-Down Switching Regulators
Manufacturer
Linear Technology
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FEATURES
DESCRIPTIO
APPLICATIO S
The LT
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
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TYPICAL APPLICATIO
6V
** INCREASE L1 TO 10µH FOR LOAD CURRENTS ABOVE 0.6A AND TO 20µH ABOVE 1A
* RIPPLE CURRENT ≥ I
†
†
Constant 500kHz Switching Frequency
Uses All Surface Mount Components
Inductor Size Reduced to 5
Easily Synchronizable
Saturating Switch Design: 0.4Ω
Effective Supply Current: 2.5mA
Shutdown Current: 20µA
Cycle-by-Cycle Current Limiting
Portable Computers
Battery-Powered Systems
Battery Charger
Distributed Power
TO 25V
FOR INPUT VOLTAGE BELOW 7.5V, SOME RESTRICTIONS MAY APPLY.
SEE APPLICATIONS INFORMATION.
INPUT
10µF TO
®
1375/LT1376 are 500kHz monolithic buck mode
50µF
C3*
+
DEFAULT
OUT
= ON
U
U
/2
5V Buck Converter
V
SHDN
IN
GND
LT1376-5
BOOST
µ
H
U
V
C
BIAS
V
C
3.3nF
SW
FB
C
C2
0.1µF
D2
1N5818
1N914
5µH
L1**
D2
+
C1
100µF, 10V
SOLID
TANTALUM
OUTPUT**
5V, 1.25A
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
20µA on both parts. The LT1375 can be externally syn-
chronized from 580kHz to 900kHz 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.
All other trademarks are the property of their respective owners.
1375/76 TA01
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
1.5A, 500kHz Step-Down
Switching Regulators
100
90
80
70
60
50
0
V
V
L = 10µH
OUT
IN
Efficiency vs Load Current
= 10V
0.25
= 5V
LOAD CURRENT (A)
LT1375/LT1376
0.50
0.75
1.00
1375/76 TA02
1.25
13756fd
1
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