LTC1702IGN datasheet(3/36 Pages) LINER

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LTC1702

ELECTRICAL CHARACTERISTICS

Note 1: Absolute Maximum Ratings are those values beyond which the life

of a device may be impaired.

Note 2: PVCC and BVCC (VBOOST – VSW) must be greater than VGS(ON) of

the external MOSFETs used to ensure proper operation.

Note 3: All currents into device pins are positive; all currents out of device

pins are negative. All voltages are referenced to ground unless otherwise

specified.

Note 4: Supply current in normal operation is dominated by the current

needed to charge and discharge the external MOSFET gates. This current

will vary with supply voltage and the external MOSFETs used.

Note 5: Supply current in shutdown is dominated by external MOSFET

leakage and may be significantly higher than the quiescent current drawn

by the LTC1702, especially at elevated temperature.

Note 6: This parameter is guaranteed by correlation and is not tested

directly.

Note 7: Rise and fall times are measured using 10% and 90% levels. Delay

and nonoverlap times are measured using 50% levels.

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

VCC = 5V unless otherwise specified. (Note 3)

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Switching Characteristics

fOSC

Oscillator Frequency

Test Circuit 1, CL = 0pF

475

550

750

kHz

ΦOSC2

Converter 2 Oscillator Phase

Relative to Converter 1 (Note 6)

180

DEG

DCMIN1

Minimum Duty Cycle

VFB < VMAX

710

DCMIN2

Minimum Duty Cycle

VFB > VMAX

DCMAX

Maximum Duty Cycle

tNOV

Driver Nonoverlap

Test Circuit 1, CL = 2000pF (Note 7)

100

tr, tf

Driver Rise/Fall Time

Test Circuit 1, CL = 2000pF (Note 7)

Feedback Amplifier

AVFB

FB DC Gain

GBW

FB Gain Bandwidth

MHz

IERR

FB Sink/Source Current

±3

±10

VMIN

MIN Comparator Threshold

760

785

VMAX

MAX Comparator Threshold

815

840

Current Limit Loop

AVILIM

ILIM Gain

IIMAX

IMAX Source Current

IMAX = 0V, LTC1702C

–7

–10

–13

µA

IMAX = 0V, LTC1702I

–7

–10

–14

µA

Status Outputs

VPGOOD

PGOOD Trip Point

VFB Relative to Regulated VOUT

–10

– 5

– 2

VOLPG

PGOOD Output Low Voltage

PGOOD = 1mA

0.03

0.1

IPGOOD

PGOOD Output Leakage

±0.1

±1

µA

tPGOOD

PGOOD Delay Time

VFB < VPGOOD to PGOOD

(Note 7)

100

µs

VFAULT

FAULT Trip Point

VFB Relative to Regulated VOUT

+10

+ 15

+20

VOLF

FAULT Output Low Voltage

IFAULT = 1mA

0.03

0.1

IFAULT

FAULT Output Current

VFAULT = 0V

– 10

µA

tFAULT

FAULT Delay Time

VFB > VFAULT to FAULT

(Note 7)

µs

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