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LT1738

1738fa

(Note 1)

Supply Voltage (VIN) ................................................ 20V

Gate Drive Current ..................................... Internal Limit

V5 Current ................................................. Internal Limit

SHDN Pin Voltage .................................................... 20V

Feedback Pin Voltage (Trans. 10ms) ......................

±10V

Feedback Pin Current ............................................ 10mA

Negative Feedback Pin Voltage (Trans. 10ms) ........

±10V

CS Pin .......................................................................... 5V

GCL Pin ..................................................................... 16V

SS Pin .......................................................................... 3V

Operating Junction Temperature Range

(Note 3) ............................................ – 40

°C to 125°C

Storage Temperature Range ................. – 65

°C to 150°C

Lead Temperature (Soldering, 10 sec).................. 300

°C

ORDER PART

NUMBER

LT1738EG

LT1738IG

TJMAX = 150°C, θJA = 110°C/ W

ELECTRICAL CHARACTERISTICS

ABSOLUTE

AXI U

RATI GS

PACKAGE/ORDER I FOR ATIO

The q denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VC = 0.9V, VFB = VREF, RVSL, RCSL = 16.9k, RT = 16.9k and

other pins open unless otherwise noted.

TOP VIEW

G PACKAGE

20-LEAD PLASTIC SSOP

GATE

CAP

GCL

SYNC

NFB

PGND

VIN

RVSL

RCSL

SHDN

GND

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Error Amplifiers

VREF

Reference Voltage

Measured at Feedback Pin

1.235

1.250

1.265

IFB

Feedback Input Current

VFB = VREF

250

1000

FBREG

Reference Voltage Line Regulation

2.7V

≤ VIN ≤ 20V

0.012

0.03

%/V

VNFR

Negative Feedback Reference Voltage

Measured at Negative Feedback Pin

–2.56

– 2.50

–2.45

with Feedback Pin Open

INFR

Negative Feedback Input Current

VNFB = VNFR

–37

– 25

µA

NFBREG

Negative Feedback Reference Voltage Line Regulation

2.7V

≤ VIN ≤ 20V

0.009

0.03

%/V

Error Amplifier Transconductance

∆IC = ±50µA

1100

1500

2200

µmho

700

2500

µmho

IESK

Error Amp Sink Current

VFB = VREF + 150mV, VC = 0.9V

120

200

350

µA

IESRC

Error Amp Source Current

VFB = VREF – 150mV, VC = 0.9V

120

200

350

µA

VCLH

Error Amp Clamp Voltage

High Clamp, VFB = 1V

1.27

VCLL

Error Amp Clamp Voltage

Low Clamp, VFB = 1.5V

0.12

Error Amplifier Voltage Gain

180

250

V/V

FBOV

FB Overvoltage Shutdown

Outputs Drivers Disabled

1.47

ISS

Soft-Start Charge Current

VSS = 1V

9.0

µA

Consult LTC Marketing for parts specified with wider operating temperature ranges.

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