LTC1628C datasheet(2/32 Pages) LINER

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LTC1628/LTC1628-PG

ORDER PART

NUMBER

LTC1628CG

LTC1628IG

LTC1628CG-PG

LTC1628IG-PG

(Note 1)

Input Supply Voltage (VIN).........................36V to –0.3V

Top Side Driver Voltages

(BOOST1, BOOST2) ...................................42V to – 0.3V

Switch Voltage (SW1, SW2) .........................36V to – 5V

INTVCC, EXTVCC, RUN/SS1, RUN/SS2, (BOOST1-SW1),

(BOOST2-SW2), PGOOD .............................7V to – 0.3V

SENSE1+, SENSE2 +, SENSE1–,

SENSE2 – Voltages ........................ (1.1)INTVCC to –0.3V

FREQSET, STBYMD, FCB,

FLTCPL Voltage ................................... INTVCC to –0.3V

ITH1, ITH2, VOSENSE1, VOSENSE2 Voltages ...2.7V to –0.3V

Peak Output Current <10

µs (TG1, TG2, BG1, BG2) ... 3A

INTVCC Peak Output Current ................................ 50mA

Operating Temperature Range

LTC1628C/LTC1628C-PG ........................ 0

°C to 85°C

LTC1628I/LTC1628I-PG ..................... – 40

°C to 85°C

Junction Temperature (Note 2) ............................. 125

°C

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

°C to 150°C

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

°C

TJMAX = 125°C, θJA = 95°C/W

Consult factory for Military grade parts.

The q denotes the specifications which apply over the full operating

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Main Control Loops

VOSENSE1, 2

Regulated Feedback Voltage

(Note 3); ITH1, 2 Voltage = 1.2V

0.792

0.800

0.808

IVOSENSE1, 2

Feedback Current

(Note 3)

– 5

– 50

VREFLNREG

Reference Voltage Line Regulation

VIN = 3.6V to 30V (Note 3)

0.002

0.02

%/V

VLOADREG

Output Voltage Load Regulation

(Note 3)

Measured in Servo Loop;

∆ITH Voltage = 1.2V to 0.7V

0.1

0.5

Measured in Servo Loop;

∆ITH Voltage = 1.2V to 2.0V

– 0.1

– 0.5

gm1, 2

Transconductance Amplifier gm

ITH1, 2 = 1.2V; Sink/Source 5uA; (Note 3)

1.3

mmho

gmGBW1, 2

Transconductance Amplifier GBW

ITH1, 2 = 1.2V; (Note 3)

MHz

Input DC Supply Current

(Note 4)

Normal Mode

VIN = 15V; EXTVCC Tied to VOUT1; VOUT1 = 5V

350

µA

Standby

VRUN/SS1, 2 = 0V, VSTBYMD > 2V

125

µA

Shutdown

VRUN/SS1, 2 = 0V, VSTBYMD = Open;

µA

VFCB

Forced Continuous Threshold

0.76

0.800

0.84

IFCB

Forced Continuous Pin Current

VFCB = 0.85V

– 0.30

– 0.18

– 0.1

µA

VBINHIBIT

Burst Inhibit (Constant Frequency)

Measured at FCB pin

4.3

4.8

Threshold

UVLO

Undervoltage Lockout

VIN Ramping Down

3.5

VOVL

Feedback Overvoltage Lockout

Measured at VOSENSE1, 2

0.84

0.86

0.88

ISENSE

Sense Pins Total Source Current

(Each Channel); VSENSE1–, 2– = VSENSE1+, 2+ = 0V

– 85

– 60

µA

VSTBYMD MS

Master Shutdown Threshold

VSTBYMD Ramping Down

0.4

0.6

temperature range, otherwise specifications are at TA = 25°C. VIN = 15V, VRUN/SS1, 2 = 5V unless otherwise noted.

TOP VIEW

G PACKAGE

28-LEAD PLASTIC SSOP

RUN/SS1

SENSE1+

SENSE1–

VOSENSE1

FREQSET

STBYMD

FCB

ITH1

SGND

3.3VOUT

ITH2

VOSENSE2

SENSE2–

SENSE2+

FLTCPL

TG1

SW1

BOOST1

VIN

BG1

EXTVCC

INTVCC

PGND

BG2

BOOST2

SW2

TG2

RUN/SS2

*PGOOD ON THE LTC1628-PG

ABSOLUTE

AXI U

RATI GS

PACKAGE/ORDER I FOR ATIO

ELECTRICAL CHARACTERISTICS

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