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Linear Technology Electronic Components Datasheet

LT1372 Datasheet

500kHz and 1MHz High Efficiency 1.5A Switching Regulators

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LT1372/LT1377
500kHz and 1MHz
High Efficiency
1.5A Switching Regulators
FEATURES
s Faster Switching with Increased Efficiency
s Uses Small Inductors: 4.7µH
s All Surface Mount Components
s Only 0.5 Square Inch of Board Space
s Low Minimum Supply Voltage: 2.7V
s Quiescent Current: 4mA Typ
s Current Limited Power Switch: 1.5A
s Regulates Positive or Negative Outputs
s Shutdown Supply Current: 12µA Typ
s Easy External Synchronization
s 8-Pin SO or PDIP Packages
U
APPLICATIONS
s Boost Regulators
s CCFL Backlight Driver
s Laptop Computer Supplies
s Multiple Output Flyback Supplies
s Inverting Supplies
DESCRIPTION
The LT®1372/LT1377 are monolithic high frequency
switching regulators. They can be operated in all standard
switching configurations including boost, buck, flyback,
forward, inverting and “Cuk.” A 1.5A high efficiency switch
is included on the die, along with all oscillator, control and
protection circuitry. All functions of the LT1372/LT1377
are integrated into 8-pin SO/PDIP packages.
The LT1372/LT1377 typically consumes only 4mA quies-
cent current and has higher efficiency than previous parts.
High frequency switching allows for very small inductors
to be used. All surface mount components consume less
than 0.5 square inch of board space.
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
5V L1*
4.7µH
D1
MBRS120T3
OFF ON 4 S/S
5
VIN VSW 8
+ C1**
22µF
LT1372/LT1377
2
FB
GND
6, 7
VC
1
C2
0.047µF
R3
2k
R1
53.6k
1%
+
R2
6.19k
1%
C3
0.0047µF
VOUT
12V
C4**
22µF
*COILCRAFT DO1608-472 (4.7µH) OR
COILCRAFT DT3316-103 (10µH) OR
SUMIDA CD43-4R7 (4.7µH) OR
SUMIDA CD73-100KC (10µH) OR
**AVX TPSD226M025R0200
MAX IOUT
L1 IOUT
4.7µH 0.25A
10µH 0.35A
LT1372 • TA01
12V Output Efficiency
100
VIN = 5V
90
80
70
60
50
0.01
0.1
OUTPUT CURRENT (A)
1
LT1372 • TA02
1


Linear Technology Electronic Components Datasheet

LT1372 Datasheet

500kHz and 1MHz High Efficiency 1.5A Switching Regulators

No Preview Available !

LT1372/LT1377
ABSOLUTE AXI U RATI GS
Supply Voltage ....................................................... 30V
Switch Voltage
LT1372/LT1377 .................................................. 35V
LT1372HV .......................................................... 42V
S/S Pin Voltage ....................................................... 30V
Feedback Pin Voltage (Transient, 10ms) .............. ±10V
Feedback Pin Current ........................................... 10mA
Negative Feedback Pin Voltage
(Transient, 10ms) ............................................. ±10V
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
ORDER PART NUMBER
TOP VIEW
VC 1
FB 2
NFB 3
S/S 4
8 VSW
7 GND
6 GND S
5 VIN
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
LT1372CN8 LT1372HVIN8
LT1372HVCN8 LT1372IS8
LT1372CS8 LT1372HVIS8
LT1372HVCS8 LT1377CS8
LT1372IN8 LT1377IS8
S8 PART MARKING
TJMAX = 125°C, θJA = 100°C/ W (N8)
TJMAX = 125°C, θJA = 120°C/ W (S8)
1372 1372H 1377
1372I 1372HI 1377I
Consult factory for Military grade parts.
*Units shipped prior to Date Code 9552 are rated at 100°C maximum
operating temperature.
ELECTRICAL CHARACTERISTICS
VIN = 5V, VC = 0.6V, VFB = VREF, VSW, S/S and NFB pins open, unless otherwise noted.
SYMBOL PARAMETER
VREF Reference Voltage
IFB Feedback Input Current
CONDITIONS
Measured at Feedback Pin
VC = 0.8V
VFB = VREF
Reference Voltage Line Regulation
VNFB Negative Feedback Reference Voltage
INFB Negative Feedback Input Current
Negative Feedback Reference Voltage
Line Regulation
gm Error Amplifier Transconductance
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
IC = ±25µA
Error Amplifier Source Current
Error Amplifier Sink Current
Error Amplifier Clamp Voltage
AV Error Amplifier Voltage Gain
VC Pin Threshold
f Switching Frequency
VFB = VREF – 150mV, VC = 1.5V
VFB = VREF + 150mV, VC = 1.5V
High Clamp, VFB = 1V
Low Clamp, VFB = 1.5V
Duty Cycle = 0%
2.7V VIN 25V
LT1372
0°C TJ 125°C
– 40°C TJ < 0°C (I Grade)
LT1377
0°C TJ 125°C
– 40°C TJ < 0°C (I Grade)
MIN
1.230
q 1.225
q
q
– 2.540
q – 2.570
q – 45
q
1100
q 700
q 120
q
1.70
0.25
0.8
450
q 430
400
0.90
q 0.86
0.80
TYP
1.245
1.245
250
0.01
– 2.490
– 2.490
– 30
0.01
1500
200
1400
1.95
0.40
500
1
500
500
1
1
MAX
1.260
1.265
550
900
0.03
– 2.440
– 2.410
– 15
0.05
UNITS
V
V
nA
nA
%/ V
V
V
µA
%/V
1900 µmho
2300 µmho
350 µA
2400 µA
2.30 V
0.52 V
V/ V
1.25 V
550 kHz
580 kHz
580 kHz
1.10 MHz
1.16 MHz
1.16 MHz
2


Part Number LT1372
Description 500kHz and 1MHz High Efficiency 1.5A Switching Regulators
Maker Linear Technology
PDF Download

LT1372 Datasheet PDF





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