SC4620 Просмотр технического описания (PDF) - Semtech Corporation

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SC4620

Low Input Voltage, High Effciency, 2.5A Integrated FET Synchronous Step down DC/DC Regulator

Semtech Corporation 

SC4620

POWER MANAGEMENT

Electrical Characteristics (Cont.)

Unless otherwise specified, VIN= VCC=SYNC/EN=3.3V, ROSC=51.1KΩ, RISET=27.4KΩ, TA = -40°C to 85°C.

Parameter

Symbol

Conditions

Thermal Shutdown

Thermal Shutdown Trip Point

Thermal Shutdown Hysteresis

Synchronization, Enable Input

TOTP

TOTP_HYS

Temperature Rising

SYNC/EN Threshold

Frequency Range, SYNC

Oscillator

VENL

VENH

FSYNC

Logic Low

Logic High

20% Higher than FOSC

Osciilator Frequency Range

Osciilator Frequency Accuracy

Ramp Peak to Valley(1)

Ramp Peak Voltage(1)

Ramp Valley Voltage(1)

Soft Start, Current Limit

FOSC

VPV

VP

VV

ROSC= 51.1KΩ

ROSC=51.1KΩ, TA=TJ=25°C

Soft-Start Charge Current

ISET Bias Voltage

Over Current Trip

Output UVLO

Hiccup period(1)

Error Amplifier

Error Amplifier Open Loop

Voltage Gain (1)

Error Amplifier Unity Gain Bandwidth(1)

ISS

VISET

IIST

VOUV

TOCHP

RISET = 27.4KΩ

RISIT = 57.6KΩ

VFB drop

Output Voltage Slew Rate, COMP(1)

Source Output Current, COMP

FB = 0.4V

Sink Output Current, COMP

FB = 0.6V

Output Voltage High, COMP

FB = 0.4V, ICOMP = -1mA

 2008 Semtech Corp.



Min

Typ

Max Units

160

°C

10

°C

0.8

V

2.0

V

200

2000 kHz

200

2000 kHz

415

500

585 kHz

435

500

565 kHz

1.0

V

1.25

V

0.25

V

4

µA

0.45

0.55

0.61

V

1.9

2.55

3.1

A

0.3

V

131072

clks

100

dB

10

MHz

4

V/µs

20

mA

25

mA

2.5

V

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