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Linear Technology Electronic Components Datasheet

LT1373 Datasheet

250kHz Low Supply Current High Efficiency 1.5A Switching Regulator

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FEATURES
s 1mA IQ at 250kHz
s Uses Small Inductors: 15µH
s All Surface Mount Components
s Only 0.6 Square Inch of Board Space
s Low Minimum Supply Voltage: 2.7V
s Constant Frequency Current Mode
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
APPLICATIO S
s Boost Regulators
s CCFL Backlight Driver
s Laptop Computer Supplies
s Multiple Output Flyback Supplies
s Inverting Supplies
LT1373
250kHz Low Supply Current
High Efficiency
1.5A Switching Regulator
DESCRIPTIO
The LT®1373 is a low supply current high frequency
current mode switching regulator. It can be operated in all
standard switching configurations including boost, buck,
flyback, forward, inverting and “Cuk.” A 1.5A high effi-
ciency switch is included on the die, along with all oscilla-
tor, control and protection circuitry. All functions of the
LT1373 are integrated into 8-pin SO/PDIP packages.
Compared to the 500kHz LT1372, which draws 4mA of
quiescent current, the LT1373 switches at 250kHz, typi-
cally consumes only 1mA and has higher efficiency. High
frequency switching allows for small inductors to be used.
All surface mount components consume less than 0.6
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 APPLICATIO
5V-to-12V Boost Converter
5V L1*
22µH
D1
MBRS120T3
OFF ON 4 S/S
5
VIN VSW 8
+ C1**
22µF
LT1373
2
FB
GND
6, 7
VC
1
C2
0.01µF
R3
5k
R1
215k
1%
+
R2
24.9k
1%
VOUT
12V
C4**
22µF
MAX IOUT
L1 IOUT
15µH 0.3A
22µH 0.35A
*SUMIDA CD75-220KC (22µH) OR
COILCRAFT D03316-153 (15µH)
**AVX TPSD226M025R0200
LT1373 • TA01
12V Output Efficiency
100
VIN = 5V
f = 250kHz
90
80
70
60
50
1
10 100 1000
OUTPUT CURRENT (mA)
LT1373 • TA02
1


Linear Technology Electronic Components Datasheet

LT1373 Datasheet

250kHz Low Supply Current High Efficiency 1.5A Switching Regulator

No Preview Available !

LT1373
ABSOLUTE AXI U RATI GS
(Note 1)
Supply Voltage ....................................................... 30V
Switch Voltage
LT1373 ............................................................... 35V
LT1373HV .......................................................... 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
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
ORDER PART
NUMBER
VC 1
FB 2
NFB 3
S/S 4
8 VSW
7 GND
6 GND S
5 VIN
N8 PACKAGE
S8 PACKAGE
8-LEAD PDIP 8-LEAD PLASTIC SO
TJMAX = 125°C, θJA = 100°C/ W (N8)
TJMAX = 125°C, θJA = 120°C/ W (S8)
LT1373CN8 LT1373IN8
LT1373HVCN8 LT1373HVIN8
LT1373CS8 LT1373IS8
LT1373HVCS8 LT1373HVIS8
S8 PART MARKING
1373 1373H
1373I 1373HI
Consult factory for Military grade parts.
*Units shipped prior to Date Code 9552 are rated at 100°C maximum
operating temperature.
ELECTRICAL CHARACTERISTICS
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
VIN = 5V, VC = 0.6V, VFB = VREF, VSW, S/S and NFB pins open, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
VREF Reference Voltage
IFB Feedback Input Current
Measured at Feedback Pin
VC = 0.8V
VFB = VREF
1.230
q 1.225
q
1.245
1.245
50
1.260
1.265
150
275
Reference Voltage Line Regulation
VNFB Negative Feedback Reference Voltage
INFB Negative Feedback Input Current
Negative Feedback Reference Voltage
Line Regulation
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
q
– 2.51
q – 2.55
q – 12
q
0.01
– 2.45
– 2.45
–7
0.01
0.03
– 2.39
– 2.35
–2
0.05
gm Error Amplifier Transconductance
IC = ±5µA
250 375 500
q 150
600
Error Amplifier Source Current
Error Amplifier Sink Current
Error Amplifier Clamp Voltage
AV Error Amplifier Voltage Gain
VC Pin Threshold
f Switching Frequency
Maximum Switch Duty Cycle
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
0°C TJ 125°C
– 40°C TJ 0°C (I Grade)
q 25 50 90
q 850 1500
1.70 1.95 2.30
0.25 0.40 0.52
250
0.8 1 1.25
225 250 275
q 210 250 290
200 290
q 90
95
Switch Current Limit Blanking Time
340 500
UNITS
V
V
nA
nA
%/V
V
V
µA
%/V
µmho
µmho
µA
µA
V
V
V/ V
V
kHz
kHz
kHz
%
ns
2


Part Number LT1373
Description 250kHz Low Supply Current High Efficiency 1.5A Switching Regulator
Maker Linear Technology
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LT1373 Datasheet PDF






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