LTC1430A Просмотр технического описания (PDF) - Linear Technology

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производитель

LTC1430A

High Power Step-Down Switching Regulator Controller

Linear Technology 

LTC1430A

ELECTRICAL CHARACTERISTICS

VCC = 5V, TA = 25°C (Note 2) unless otherwise noted.

SYMBOL

VIH

VIL

IIN

gmV

gmI

AV

IMAX

ISS

tr, ts

tNOV

DCMAX

PARAMETER

SHDN Input High Voltage

SHDN Input Low Voltage

SHDN Input Current

Error Amplifier Transconductance

ILIM Amplifier Transconductance

Error Amplifier Open-Loop Gain

IMAX Sink Current

Soft Start Source Current

Driver Rise/Fall Time

Driver Non-Overlap Time

Maximum Duty Cycle

CONDITIONS

(Note 4)

(Note 5)

VI(MAX) = VCC

VSS = 0V

Figure 3, PVCC1 = PVCC2 = 5V

Figure 3, PVCC1 = PVCC2 = 5V

Figure 3, VCOMP = VCC,

VFB = 1.265V

LTC1430AC

MIN TYP MAX

q 2.4

q

0.8

q

±0.1 ±1

q 350 650 1100

2400

q 40 48

q 8 12 16

q – 8 – 12 – 16

80 250

25 130 250

q 90 93.5

LTC1430AI

MIN TYP MAX

2.4

0.8

±0.1 ±1

300 650 1200

2400

40 48

8 12 17

–8 – 12 – 17

80 250

25 130 250

89 93.5

UNITS

V

V

µA

µmho

µmho

dB

µA

µA

ns

ns

%

The q denotes specifications which apply over the full operating

temperature range.

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

of a device may be impaired.

Note 2: 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 3: Supply current in normal operation is dominated by the current

needed to charge and discharge the external FET gates. This will vary with

the LTC1430A operating frequency, operating voltage and the external

FETs used.

Note 4: The ILIM amplifier can sink but cannot source current. Under

normal (not current limited) operation, the ILIM output current will be zero.

Note 5: The open-loop DC gain and transconductance from the FB pin

(SENSE + and SENSE – floating) to COMP pin will be AV and gmV

respectively.

3

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