LTC1704B Ver la hoja de datos (PDF) - Linear Technology

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LTC1704B

550kHz Synchronous Switching Regulator Controller Plus Linear Regulator Controller

Linear Technology 

LTC1704/LTC1704B

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)

SYMBOL PARAMETER

Switcher Switching Characteristics

fOSC

Oscillator Frequency

DCMAX

Maximum Duty Cycle

tNOV

Driver Nonoverlap

tr, tf

Driver Rise/Fall Time

Linear Regulator Controller

VREGFB

Feedback Voltage

IREGFB

dVREGFB

IREGDR

REGFB Input Current

Feedback Voltage Line Regulation

Feedback Voltage Load Regulation

Driver Output Current

VDROPOUT Driver Dropout Voltage

VREGILM

IREGILMINT

VPGOOD

PGOOD

IPGOOD

REGILM Threshold

REGILM Internal Pull-Up Current

Negative REGFB Power Good Threshold

Positive REGFB Power Good Threshold

VPGOOD Sink Current

VOLPG

tPGOOD

VPGOOD Output Low Voltage

VPGOOD Falling Edge Delay

VPGOOD Rising Edge Delay

CONDITIONS

MIN TYP MAX UNITS

Test Circuit

Test Circuit (Note 8)

Test Circuit (Note 8)

q 460

550

650

kHz

q 87

90

93

%

q 10

25

120

ns

q

15

100

ns

Test Circuit, RREGILM = 680k

0.784 0.800 0.816

V

q 0.780 0.800 0.820

V

q

±1

µA

Test Circuit, VCC = 4.5V to 5.5V

q

±0.05 ±0.2

%/V

Test Circuit, IREGDR = 0mA to 30mA

q –0.2 –0.05

%

Test Circuit

q 30

mA

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

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

20

mA

6

mA

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

q

dVREGFB = –1% (Note 9)

0.65

1.1

V

Test Circuit, RREGILM = 680k

0.8

V

VREGILM = 0V

– 1.9

µA

q –15

–10

–6

%

q6

10

15

%

Power Good

Power Bad

IPGOOD = 1mA

(Note 8)

(Note 8)

q

q 10

10

µA

mA

q

0.03

0.1

V

q 0.5

1

4

µs

q 10

20

40

µs

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.

1704bfa

3

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