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Linear Technology Electronic Components Datasheet

LT1370 Datasheet

500kHz High Efficiency 6A Switching Regulator

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LT1370
500kHz High Efficiency
6A 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: 4.5mA Typ
s Current Limited Power Switch: 6A
s Regulates Positive or Negative Outputs
s Shutdown Supply Current: 12µA Typ
s Easy External Synchronization
s Switch Resistance: 0.065Typ
U
APPLICATIONS
s Boost Regulators
s Laptop Computer Supplies
s Multiple Output Flyback Supplies
s Inverting Supplies
DESCRIPTION
The LT®1370 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 6A high efficiency switch
is included on the die, along with all oscillator, control and
protection circuitry.
The LT1370 typically consumes only 4.5mA 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
reduces output overshoot on start-up or overload recov-
ery. Oscillator frequency shifting protects external com-
ponents during overload conditions.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
ON
OFF
+ C1**
22µF
25V
5V to 12V Boost Converter
5V
L1*
D1
MBRD835L
VOUT†
12V
VIN
S/S VSW
LT1370
FB
GND VC
C2
0.047µF
R3
2k
R1
53.6k
1%
+
R2
6.19k
1%
C3
0.0047µF
C4**
22µF
25V
×2
*COILTRONICS
UP2-4R7 (4.7µH)
UP4-100 (10µH)
**AVX TPSD226M025R0200
MAX IOUT
L1 IOUT
4.7µH 1.8A
10µH 2A
LT1370 • TA01
12V Output Efficiency
92
VIN = 5V
L = 10µH
90
88
86
84
82
80
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
LOAD CURRENT (A)
LT1370 • TA02
1


Linear Technology Electronic Components Datasheet

LT1370 Datasheet

500kHz High Efficiency 6A Switching Regulator

No Preview Available !

LT1370
ABSOLUTE AXI U RATI GS
Supply Voltage ....................................................... 30V
Switch Voltage
LT1370 ............................................................... 35V
LT1370HV .......................................................... 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
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 NFB
TAB 5 VSW
IS 4 GND
GND 3 S/S
2 FB
1 VC
R PACKAGE
7-LEAD PLASTIC DD
TJMAX = 125°C, θJA = 30°C/W, θJC = 4°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
Consult factory for Military grade parts.
ORDER PART
NUMBER
LT1370CR
LT1370HVCR
LT1370IR
LT1370HVIR
FRONT VIEW
7 VIN
6 NFB
TAB 5 VSW
IS 4 GND
GND 3 S/S
2 FB
1 VC
T7 PACKAGE
7-LEAD TO-220
TJMAX = 125°C, θJA = 50°C/W, θJC = 4°C/W
ORDER PART
NUMBER
LT1370CT7
LT1370HVCT7
LT1370IT7
LT1370HVIT7
ELECTRICAL CHARACTERISTICS
VIN = 5V, VC = 0.6V, VFB = VREF, VSW, S/S and NFB pins open, TA = 25°C unless otherwise noted.
SYMBOL PARAMETER
VREF Reference Voltage
IFB Feedback Input Current
Reference Voltage Line Regulation
VNFR Negative Feedback Reference Voltage
INFB Negative Feedback Input Current
Negative Feedback Reference Voltage
Line Regulation
gm Error Amplifier Transconductance
Error Amplifier Source Current
Error Amplifier Sink Current
CONDITIONS
Measured at Feedback Pin
VC = 0.8V
VFB = VREF
2.7V VIN 25V, VC = 0.8V
Measured at Negative Feedback Pin
Feedback Pin Open, VC = 0.8V
VNFB = VNFR
2.7V VIN 25V, VC = 0.8V
MIN
1.230
q 1.225
q
q
– 2.525
q – 2.560
q – 45
q
IC = ±25µA
VFB = VREF – 150mV, VC = 1.5V
VFB = VREF + 150mV, VC = 1.5V
1100
q 700
q 120
q
TYP
1.245
1.245
250
0.01
– 2.48
– 2.48
– 30
0.01
1500
200
1400
MAX
1.260
1.265
550
900
0.03
– 2.435
– 2.400
– 15
0.05
UNITS
V
V
nA
nA
%/ V
V
V
µA
%/V
1900 µmho
2300 µmho
350 µA
2400 µA
2


Part Number LT1370
Description 500kHz High Efficiency 6A Switching Regulator
Maker Linear Technology
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LT1370 Datasheet PDF





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