SC4510 Ver la hoja de datos (PDF) - Semtech Corporation

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SC4510

High Performance Synchronous Buck Controller With Reference Tracking

Semtech Corporation 

POWER MANAGEMENT

Electrical Characteristics (Cont.)

Unless specified: TA = TJ = -40°C to +85°C, AVCC/PVCC = 12V, Fosc = 300 kHz, SS/EN = 5V

Parameter

Symbol

Test Conditions

Min

Error Amplifier

Input Bias Current

Input Offset Voltage

Transconductance Gain

GM

Output Source Mode

Output Sink Mode

Unity Gain Bandwidth (1)

Output Sink/Source Current

Buffered Reference

VCOMP = 2.5V

Internal reference

Line regulation

VREF

-40C to +85C

0.49

5V < AVCC < 15V

External reference input range

VREFIN

0.3

Tracking accuracy

VREFOUT

With respect to VREFIN

(Greater of the two)

Reference output current

IREFOUT

Oscillator and Synchronisation

Frequency range

Fosc

0.1

Frequency setting

Fosc

ROSC = 221K

270

Sync input High voltage

1.5

Sync input Low voltage

Duty Cycle

Maximum Duty Cycle

Fosc = 1 MHz

Fosc = 300 kHz

Minimum Duty Cycle

Fosc = 100 kHz

Minimum pulse width

Fosc = 0.1 to 1 MHz

Current Limit

Current limit sense threshold

VCSLIM

Output source mode

60

Output sink mode

-85

Delay to Output (1)

tCSDLY

10 mV Overdrive

SC4510

Typ

Max

Unit

0.4

0.7

µA

2.5

mV

275

µΩ−1

375

3

MHz

15

µA

0.5

0.51

V

0.02

%/V

3.0

V

+ 0.5

%

+10.0

mV

5

mA

1

MHz

300

330

KHz

V

0.5

V

70

%

90

%

5

%

250

nS

75

90

mV

-110

-130

mV

50

nS

© 2004 Semtech Corp.

3

www.semtech.com

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