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Linear Technology Electronic Components Datasheet

LT1371 Datasheet

500kHz High Efficiency 3A Switching Regulator

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LT1371
500kHz High Efficiency
3A Switching Regulator
FEATURES
s Faster Switching with Increased Efficiency
s Uses Small Inductors: 4.7µH
s All Surface Mount Components
s Low Minimum Supply Voltage: 2.7V
s Quiescent Current: 4mA Typ
s Current Limited Power Switch: 3A
s Regulates Positive or Negative Outputs
s Shutdown Supply Current: 12µA Typ
s Easy External Synchronization
U
APPLICATIONS
s Boost Regulators
s Laptop Computer Supplies
s Multiple Output Flyback Supplies
s Inverting Supplies
DESCRIPTION
The LT®1371 is a monolithic high frequency current mode
switching regulator. It can be operated in all standard
switching configurations including boost, buck, flyback,
forward, inverting and “Cuk.” A 3A high efficiency switch
is included on the die, along with all oscillator, control and
protection circuitry.
The LT1371 typically consumes only 4mA quiescent
current and has higher efficiency than previous parts.
High frequency switching allows for very small inductors
to be used.
New design techniques increase flexibility and maintain
ease of use. Switching is easily synchronized to an exter-
nal logic level source. A logic low on the Shutdown pin
reduces supply current to 12µA. Unique error amplifier
circuitry can regulate positive or negative output voltage
while maintaining simple frequency compensation tech-
niques. Nonlinear error amplifier transconductance re-
duces output overshoot on start-up or overload recovery.
Oscillator frequency shifting protects external compo-
nents during overload conditions.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
5V to 12V Boost Converter
ON
OFF
+ C1**
22µF
25V
5V L1*
4.7µH
VIN
S/S VSW
LT1371
FB
GND VC
C2
0.047µF
R3
2k
D1
MBRS330T3
R1
53.6k
1%
VOUT†
12V
+
R2
6.19k
1%
C3
0.0047µF
LT1371 • TA01
C4**
22µF
25V
×2
*COILCRAFT DO3316P-472 (4.7µH),
DO3316P-103 (10µH) OR
SUMIDA CD104-100MC (10µH)
**AVX TPSD226M025R0200
MAX IOUT
L1 IOUT
4.7µH 0.7A
10µH 0.8A
12V Output Efficiency
100
VIN = 5V
90
80
70
60
50
0.01
0.1
OUTPUT CURRENT (A)
1
LT1371 • TA02
1


Linear Technology Electronic Components Datasheet

LT1371 Datasheet

500kHz High Efficiency 3A Switching Regulator

No Preview Available !

LT1371
ABSOLUTE AXI U RATI GS
Supply Voltage ....................................................... 30V
Switch Voltage
LT1371 ............................................................... 35V
LT1371HV .......................................................... 42V
S/S, SHDN, SYNC Pin Voltage ................................ 30V
Feedback Pin Voltage (Transient, 10ms) .............. ±10V
Feedback Pin Current ........................................... 10mA
Negative Feedback Pin Voltage
(Transient, 10ms) ............................................. ±10V
Operating Ambient Temperature Range ...... 0°C to 70°C
Operating Junction Temperature Range
Commercial .......................................... 0°C to 125°C
Industrial ......................................... – 40°C to 125°C
Short Circuit ......................................... 0°C to 150°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
PACKAGE/ORDER I FOR ATIO
FRONT VIEW
7 VIN
6 S/S
TAB 5 VSW
IS 4 GND
GND 3 NFB
2 FB
1 VC
R PACKAGE
7-LEAD PLASTIC DD
TJMAX = 125°C, θJA = 30°C/W
WITH PACKAGE SOLDERED TO 0.5 INCH2 COPPER
AREA OVER BACKSIDE GROUND PLANE OR INTERNAL
POWER PLANE. θJA CAN VARY FROM 20°C/W TO
> 40°C/W DEPENDING ON MOUNTING TECHNIQUE
ORDER PART
NUMBER
LT1371CR
LT1371HVCR
LT1371IR
LT1371HVIR
FRONT VIEW
7 VIN
6 S/S
TAB 5 VSW
IS 4 GND
GND 3 NFB
2 FB
1 VC
T7 PACKAGE
7-LEAD TO-220
TJMAX = 125°C, θJA = 50°C/W, θJC = 4°C/W
Consult factory for Military grade parts.
ORDER PART
NUMBER
LT1371CT7
LT1371HVCT7
LT1371IT7
LT1371HVIT7
TOP VIEW
VC 1
FB 2
NFB 3
GND 4
GND 5
GND 6
GND 7
SHDN 8
SYNC 9
VIN 10
20 VSW
19 NC
18 VSW
17 GND
16 GND
15 GND
14 GND
13 NC
12 NC
11 GND
SW PACKAGE
20-LEAD PLASTIC SO WIDE
TJMAX = 125°C, θJA = 50°C/W
θJA WILL VARY FROM APPROXIMATELY 40°C/W WITH
0.75 INCH2 OF 1 OZ COPPER TO 50°C/W WITH 0.33 INCH2
OF 1 OZ COPPER ON A DOUBLE-SIDED BOARD
ORDER PART
NUMBER
LT1371CSW
LT1371HVCSW
LT1371ISW
LT1371HVISW
ELECTRICAL CHARACTERISTICS
VIN = 5V, VC = 0.6V, VFB = VREF, VSW, S/S, SHDN, SYNC and NFB pins open, unless otherwise noted.
SYMBOL PARAMETER
VREF Reference Voltage
IFB Feedback Input Current
Reference Voltage Line Regulation
CONDITIONS
Measured at Feedback Pin
VC = 0.8V
VFB = VREF
2.7V VIN 25V, VC = 0.8V
MIN
1.230
q 1.225
q
q
TYP
1.245
1.245
250
0.01
MAX
1.260
1.265
550
900
0.03
UNITS
V
V
nA
nA
%/ V
2


Part Number LT1371
Description 500kHz High Efficiency 3A Switching Regulator
Maker Linear Technology
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LT1371 Datasheet PDF






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