LTC1644IGN datasheet(2/24 Pages) LINER

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LTC1644

1644f

Supply Voltages

12VIN ................................................................ 13.2V

VEEIN .................................................................. –14V

Input Voltages (Pins 5, 9) .......................– 0.3V to 13.5V

Output Voltages (Pins 6, 7, 10) ..............– 0.3V to 13.5V

Analog Voltages and Currents

Pins 3, 11 to 14, 16 to 18 ...................– 0.3V to 13.5V

Pins 4, 15 ............................. – 0.3V to (12VIN + 0.3V)

VEEOUT ...................................................– 14V to 0.3V

12VOUT ...............................................– 0.3V to 13.2V

Operating Temperature Range

LTC1644C ............................................... 0

°C to 70°C

LTC1644I ............................................ – 40

°C to 85°C

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

°C to 150°C

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

°C

ORDER PART

NUMBER

TJMAX = 140°C, θJA = 135°C/W

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

LTC1644CGN

LTC1644IGN

ABSOLUTE

AXI U

RATI GS

PACKAGE/ORDER I FOR ATIO

(Note 1)

ELECTRICAL CHARACTERISTICS

The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.

V12VIN = 12V, VEEIN = –12V, V3VIN = 3.3V, V5VIN = 5V unless otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

IDD

V12VIN Supply Current

OFF/ON = 0V

VLKO

Undervoltage Lockout

12VIN, Ramping Down

6.00

8.30

10.80

3VIN, 5VIN, Ramping Down

2.25

2.48

2.75

VFB

Foldback Current Limit Voltage

VFB = (V5VIN – V5VSENSE), V5VOUT = 0V, TIMER = 0V

812

VFB = (V5VIN – V5VSENSE), V5VOUT = 3V, TIMER = 0V

VFB = (V3VIN – V3VSENSE), V3VOUT = 0V, TIMER = 0V

812

VFB = (V3VIN – V3VSENSE), V3VOUT = 2V, TIMER = 0V

VCB

Circuit Breaker Trip Voltage

VCB = (V5VIN – V5VSENSE), TIMER = FLOAT

VCB = (V3VIN – V3VSENSE), TIMER = FLOAT

tOC

Overcurrent Fault Response Time

(V5VIN – V5VSENSE) = 100mV, TIMER = FLOAT

µs

(V3VIN – V3VSENSE) = 100mV, TIMER = FLOAT

µs

tSC

Short-Circuit Response Time

(V5VIN – V5VSENSE) = 200mV, TIMER = FLOAT

0.1

1.0

µs

(V3VIN – V3VSENSE) = 200mV, TIMER = FLOAT

0.1

1.0

µs

ICP

GATE Pin Output Current

OFF/ON = 0V, VGATE = 0V, TIMER = 0V

– 20

– 65

–100

µA

VGATE = 5V, OFF/ON = 4V

100

225

300

µA

OFF/ON = 0V, VGATE = 2V, TIMER = FLOAT, FAULT = 0V

310

∆VGATE

External Gate Voltage

∆VGATE = (V12VIN – VGATE), IGATE = –1µA

200

VDROP

Internal Switch Voltage Drop

VDROP = (V12VIN – V12VOUT), I = 500mA

200

600

VDROP = (VEEOUT – VEEIN), IEE = 100mA

110

250

ICL

Current Foldback

12VIN = 12V, 12VOUT = 0V, TIMER = 0V

– 50

–360

– 600

12VIN = 12V, 12VOUT = 10V, TIMER = 0V

– 525

– 840

– 1500

VEEIN = –12V, VEEOUT = 0V, TIMER = 0V

100

300

VEEIN = –12V, VEEOUT = –10V, TIMER = 0V

200

320

650

TTS

Thermal Shutdown Temperature

130

°C

TOP VIEW

GN PACKAGE

20-LEAD PLASTIC SSOP

12VIN

VEEIN

5VOUT

TIMER

OFF/ON

FAULT

PWRGD

GND

RESETIN

RESETOUT

12VOUT

VEEOUT

3VOUT

3VIN

3VSENSE

GATE

5VSENSE

5VIN

PRECHARGE

DRIVE

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