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Linear Technology Electronic Components Datasheet

LT1956-5 Datasheet

High Voltage/ 1.5A/ 500kHz Step-Down Switching Regulators

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FEATURES
s Wide Input Range: 5.5V to 60V
s 1.5A Peak Switch Current
s Small 16-Pin SSOP or Thermally Enhanced
TSSOP Package
s Saturating Switch Design: 0.2
s Peak Switch Current Maintained Over
Full Duty Cycle Range
s Constant 500kHz Switching Frequency
s Effective Supply Current: 2.5mA
s Shutdown Current: 25µA
s 1.2V Feedback Reference (LT1956)
s 5V Fixed Output (LT1956-5)
s Easily Synchronizable
s Cycle-by-Cycle Current Limiting
U
APPLICATIO S
s High Voltage, Industrial and Automotive
s Portable Computers
s Battery-Powered Systems
s Battery Chargers
s Distributed Power Systems
LT1956/LT1956-5
High Voltage, 1.5A,
500kHz Step-Down
Switching Regulators
DESCRIPTIO
The LT®1956/LT1956-5 are 500kHz monolithic buck
switching regulators with an input voltage capability up to
60V. A high efficiency 1.5A, 0.2switch is included on the
die along with all the necessary oscillator, control and logic
circuitry. A current mode architecture provides fast tran-
sient response and good loop stability.
Special design techniques and a new high voltage process
achieve high efficiency over a wide input range. Efficiency
is maintained over a wide output current range by using the
output to bias the circuitry and by utilizing a supply boost
capacitor to saturate the power switch. Patented circuitry
maintains peak switch current over the full duty cycle
range*. A shutdown pin reduces supply current to 25µA and
the device can be externally synchronized from 580kHz to
700kHz with a logic level input.
The LT1956/LT1956-5 are available in fused-lead 16-pin
SSOP and thermally enhanced TSSOP packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
*U.S. PATENT NO. 6,498,466
TYPICAL APPLICATIO
5V Buck Converter
MMSD914TI
VIN
12V
(TRANSIENTS
TO 60V)
2.2µF
100V
CERAMIC
6
BOOST
42
VIN SW
LT1956-5
15
SHDN
10
BIAS
14
SYNC
12
FB
GND VC
1, 8, 9, 16 11
220pF
4.7k
0.1µF
10µH
10MQ060N
VOUT
5V
1A
22µF
6.3V
CERAMIC
4700pF
UNITED CHEMI-CON THCS50EZA225ZT
1956 TA01
Efficiency vs Load Current
100
VIN = 12V
L = 18µH
90
80
VOUT = 5V
VOUT = 3.3V
70
60
50
0 0.25 0.50 0.75 1.00 1.25
LOAD CURRENT (A)
1956 TA02
1956f
1


Linear Technology Electronic Components Datasheet

LT1956-5 Datasheet

High Voltage/ 1.5A/ 500kHz Step-Down Switching Regulators

No Preview Available !

LT1956/LT1956-5
ABSOLUTE AXI U RATI GS (Note 1)
Input Voltage (VIN) ................................................. 60V
BOOST Pin Above SW ............................................ 35V
BOOST Pin Voltage ................................................. 68V
SYNC, SENSE Voltage (LT1956-5) ........................... 7V
SHDN Voltage ........................................................... 6V
BIAS Pin Voltage .................................................... 30V
FB Pin Voltage/Current (LT1956) ................... 3.5V/2mA
Operating Junction Temperature Range
LT1956EFE/LT1956EFE-5/LT1956EGN/LT1956EGN-5
(Notes 8, 10) ..................................... – 40°C to 125°C
LT1956IFE/LT1956IFE-5/LT1956IGN/LT1956IGN-5
(Notes 8, 10) ..................................... – 40°C to 125°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
GND 1
SW 2
NC 3
VIN 4
NC 5
BOOST 6
NC 7
GND 8
16 GND
15 SHDN
14 SYNC
13 NC
12 FB/SENSE
11 VC
10 BIAS
9 GND
FE PACKAGE
16-LEAD PLASTIC TSSOP
TJMAX = 125°C, θJA = 45°C/ W, θJC (PAD) = 10°C/ W
EXPOSED BACKSIDE MUST BE SOLDERED
TO GROUND PLANE
ORDER PART
NUMBER
LT1956EFE
LT1956IFE
LT1956EFE-5
LT1956IFE-5
FE PART MARKING
1956EFE
1956IFE
1956EFE-5
1956IFE-5
Consult LTC Marketing for parts specified with wider operating temperature ranges.
GND 1
SW 2
NC 3
VIN 4
NC 5
BOOST 6
NC 7
GND 8
TOP VIEW
16 GND
15 SHDN
14 SYNC
13 NC
12 FB/SENSE
11 VC
10 BIAS
9 GND
GN PACKAGE
16-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 85°C/ W, θJC (PIN 8) = 25°C/ W
FOUR CORNER PINS SOLDERED
TO GROUND PLANE
ORDER PART
NUMBER
LT1956EGN
LT1956IGN
LT1956EGN-5
LT1956IGN-5
GN PART MARKING
1956
1956I
19565
1956I5
ELECTRICAL CHARACTERISTICS
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TJ = 25°C.
VIN = 15V, VC = 1.5V, SHDN = 1V, Boost o/c, SW o/c, unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX
Reference Voltage (LT1956)
SENSE Voltage (LT1956-5)
SENSE Pin Resistance (LT1956-5)
5.5V VIN 60V
VOL + 0.2 VC VOH – 0.2
5.5V VIN 60V
VOL + 0.2 VC VOH – 0.2
1.204 1.219 1.234
q 1.195
1.243
4.94 5 5.06
q 4.90
5.10
9.5 13.8 19
FB Input Bias Current (LT1956)
q 0.5 1.5
Error Amp Voltage Gain
(Notes 2, 9)
200 400
Error Amp gm
dl (VC) = ±10µA (Note 9)
1500 2000 3000
q 1000
3200
VC to Switch gm
EA Source Current
EA Sink Current
VC Switching Threshold
VC High Clamp
FB = 1V or VSENSE = 4.1V
FB = 1.4V or VSENSE = 5.7V
Duty Cycle = 0
SHDN = 1V
1.7
q 125 225 400
q 100 225 450
0.9
2.1
UNITS
V
V
V
V
k
µA
V/V
µMho
µMho
A/V
µA
µA
V
V
1956f
2


Part Number LT1956-5
Description High Voltage/ 1.5A/ 500kHz Step-Down Switching Regulators
Maker Linear Technology
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