LTC1704B datasheet(3/28 Pages) LINER

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LTC1704/LTC1704B

1704bfa

ELECTRICAL CHARACTERISTICS

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

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

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

of a device may be impaired.

Note 2: The LTC1704E is guaranteed to meet performance specifications

from 0

°C to 70°C. Specifications over the –40°C to 85°C operating

temperature range are assured by design, characterization and correlation

with statistical process controls.

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

the external MOSFETs to ensure proper operation.

Note 5: 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 6: Supply current in shutdown is dominated by external MOSFET

leakage and may be significantly higher than the quiescent current drawn

by the LTC1704, especially at elevated temperature.

Note 7: Guaranteed by design, not subject to test.

Note 8: Rise and fall times are measured using 10% and 90% levels. Delay

and nonoverlap times are measured using 50% levels.

Note 9: Dropout voltage is the minimum VCC to VREGDR voltage differential

required to maintain regulation at the specified driver output current.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Switcher Switching Characteristics

fOSC

Oscillator Frequency

Test Circuit

460

550

650

kHz

DCMAX

Maximum Duty Cycle

tNOV

Driver Nonoverlap

Test Circuit (Note 8)

120

tr, tf

Driver Rise/Fall Time

Test Circuit (Note 8)

100

Linear Regulator Controller

VREGFB

Feedback Voltage

Test Circuit, RREGILM = 680k

0.784

0.800

0.816

0.780

0.800

0.820

IREGFB

REGFB Input Current

±1

µA

dVREGFB

Feedback Voltage Line Regulation

Test Circuit, VCC = 4.5V to 5.5V

±0.05

±0.2

%/V

Feedback Voltage Load Regulation

Test Circuit, IREGDR = 0mA to 30mA

–0.2

–0.05

IREGDR

Driver Output Current

Test Circuit

RREGILM = 680k, VREGFB = 0.76V, VREGDR = 3.3V

RREGILM = 680k, VREGFB = 0V, VREGDR = 1V

VDROPOUT

Driver Dropout Voltage

Test Circuit, IREGDR = 30mA, VREGDR = 3.3V,

0.65

1.1

dVREGFB = –1% (Note 9)

VREGILM

REGILM Threshold

Test Circuit, RREGILM = 680k

0.8

IREGILMINT

REGILM Internal Pull-Up Current

VREGILM = 0V

–1.9

µA

VPGOOD

Negative REGFB Power Good Threshold

–15

–10

–6

Positive REGFB Power Good Threshold

610

PGOOD

IPGOOD

VPGOOD Sink Current

Power Good

µA

Power Bad

VOLPG

VPGOOD Output Low Voltage

IPGOOD = 1mA

0.03

0.1

tPGOOD

VPGOOD Falling Edge Delay

(Note 8)

0.5

µs

VPGOOD Rising Edge Delay

(Note 8)

µs

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