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Linear Technology Electronic Components Datasheet

LT1376 Datasheet

1.5A/ 500kHz Step-Down Switching Regulators

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LT1375/LT1376
1.5A, 500kHz Step-Down
Switching Regulators
FEATURES
s Constant 500kHz Switching Frequency
s Easily Synchronizable
s Uses All Surface Mount Components
s Inductor Size Reduced to 5µH
s Saturating Switch Design: 0.4
s Effective Supply Current: 2.5mA
s Shutdown Current: 20µA
s Cycle-by-Cycle Current Limiting
U
APPLICATIO S
s Portable Computers
s Battery-Powered Systems
s Battery Charger
s Distributed Power
DESCRIPTIO
The LT®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
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 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.
TYPICAL APPLICATIO
5V Buck Converter
INPUT
6VTO 25V C3* +
10µF TO
50µF
DEFAULT
= ON
BOOST
VIN VSW
LT1376-5 BIAS
SHDN
GND
FB
VC
CC
3.3nF
D2
1N914
C2
0.1µF
L1**
5µH
OUTPUT**
5V, 1.25A
D2
1N5818
+ C1
100µF, 10V
SOLID
TANTALUM
* RIPPLE CURRENT IOUT/2
** INCREASE L1 TO 10µH FOR LOAD CURRENTS ABOVE 0.6A AND TO 20µH ABOVE 1A
FOR INPUT VOLTAGE BELOW 7.5V, SOME RESTRICTIONS MAY APPLY.
SEE APPLICATIONS INFORMATION.
1375/76 TA01
Efficiency vs Load Current
100
VOUT = 5V
VIN = 10V
90 L = 10µH
80
70
60
50
0
0.25 0.50 0.75 1.00
LOAD CURRENT (A)
1.25
1375/76 TA02
1


Linear Technology Electronic Components Datasheet

LT1376 Datasheet

1.5A/ 500kHz Step-Down Switching Regulators

No Preview Available !

LT1375/LT1376
ABSOLUTE MAXIMUM RATINGS (Note 1)
Input Voltage
LT1375/LT1376 .................................................. 25V
LT1375HV/LT1376HV ........................................ 30V
BOOST Pin Voltage
LT1375/LT1376 .................................................. 35V
LT1375HV/LT1376HV ........................................ 40V
SHDN Pin Voltage ..................................................... 7V
BIAS Pin Voltage ...................................................... 7V
FB Pin Voltage (Adjustable Part) ............................ 3.5V
FB Pin Current (Adjustable Part) ............................ 1mA
Sense Voltage (Fixed 5V Part) .................................. 7V
SYNC Pin Voltage ..................................................... 7V
Operating Ambient Temperature Range
LT1375C/LT1376C ................................. 0°C to 70°C
LT1375I/LT1376I ............................... – 40°C to 85°C
Operating Junction Temperature Range
LT1375C/LT1376C ............................... 0°C to 125° C
LT1375I/LT1376I ............................. – 40°C to 125°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
PACKAGE/ORDER INFORMATION
TOP VIEW
BOOST 1
VIN 2
VSW 3
SHDN 4
8 VC
7 FB/SENSE
6 GND
5 SYNC
N8 PACKAGE
S8 PACKAGE
8-LEAD PDIP 8-LEAD PLASTIC SO
θJA = 100°C/ W (N8)
θJA = 120°C/ W TO 150°C/W DEPENDING ON
PC BOARD LAYOUT (S8)
ORDER PART NUMBER
LT1375CN8
LT1375CN8-5
LT1375CS8
LT1375CS8-5
LT1375HVCS8
LT1375IN8
LT1375IN8-5
LT1375IS8
LT1375IS8-5
LT1375HVIS8
S8 PART MARKING
1375
13755
1375HV
1375I
1375I5
375HVI
Consult factory for Military grade parts.
TOP VIEW
BOOST 1
VIN 2
VSW 3
BIAS 4
8 VC
7 FB/SENSE
6 GND
5 SHDN
N8 PACKAGE
S8 PACKAGE
8-LEAD PDIP 8-LEAD PLASTIC SO
θJA = 100°C/ W (N8)
θJA = 120°C/ W TO 150°C/W DEPENDING ON
PC BOARD LAYOUT (S8)
ORDER PART NUMBER
LT1376CN8
LT1376CN8-5
LT1376CS8
LT1376CS8-5
LT1376HVCS8
LT1376IN8
LT1376IN8-5
LT1376IS8
LT1376IS8-5
LT1376HVIS8
S8 PART MARKING
1376
13765
1376HV
1376I
1376I5
376HVI
GND 1
NC 2
BOOST 3
VIN 4
VSW 5
BIAS 6
NC 7
GND 8
TOP VIEW
16 GND
15 NC
14 VC
13 FB/SENSE
12 GND
11 SHDN
10 NC
9 GND
S PACKAGE
16-LEAD PLASTIC NARROW SO
θJA = 50°C/ W WITH FUSED CORNER PINS
CONNECTED TO GROUND PLANE OR LARGE
LANDS
ORDER PART NUMBER
LT1376CS
LT1376IS
LT1376HVCS
LT1376HVIS
2


Part Number LT1376
Description 1.5A/ 500kHz Step-Down Switching Regulators
Maker Linear Technology
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LT1376 Datasheet PDF






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