SC4517A Просмотр технического описания (PDF) - Semtech Corporation

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производитель

SC4517A

1.25MHz, 1.5A Step-Down Switching Regulator

Semtech Corporation 

SC4517A

POWER MANAGEMENT

Electrical Characteristics (Cont.)

Unless specified: VIN = 12V, VCOMP = 0.8V, VBST = VIN + 5V, EN = Tied to VIN, SYNC = 0, SW = open.

TA = TJ = -40°C to 125°C.

PARAMETER

SYMBOL

CONDITIONS

FB Input Current

IFB

Feedback Voltage

SC4517A (adj)

SC4517A (adj),

3V < VIN < 16V(1)

VOUT = VFB

SC4517A-1.8V

SC4517A-2.5V

SC4517A-3.3V

SC4517A-5V

FB Input Resistance

RFB

SC4517A-1.8V

SC4517A-2.5V

SC4517A-3.3V

SC4517A-5V

FB to VCOMP Voltage Gain(2)

FB to VCOMP

Transconductance(2)

VCOMP Pin Source Current

VCOMP Pin Sink Current

VCOMP Pin to Switch Current

Transconductance

VCOMP Pin Maximum Switching

Threshold

VCOMP Pin Threshold

Maximum Switch Duty Cycle

0.4V ≤ VCOMP ≤ 0.9V

∆ ICOMP = ± 10µA

VFB = VOUT(NOM) - 17%

VFB = VOUT(NOM) + 17%

Duty cycle = 0%

ISW = 1.5A

VCOMP = 1.2V, ISW = 400mA

Minimum Boost Voltage

Above Switch

Boost Current

ISW = 1.5A, 0°C ≤ TA ≤ 125°C and

ISW = 1.3A, TA < 0°C

ISW = 0.5A

ISW = 1.5A, 0°C ≤ TA ≤ 125°C and

ISW = 1.3A, TA < 0°C

MIN TYP MAX UNITS

-0.25 -0.50 µA

1.173 1.2 1.227

1.764 1.8 1.836

2.45 2.5 2.55

V

3.234 3.3 3.366

4.9

5

5.1

10.5 15.0 21.0 kΩ

14.7 21.0 30.0

19.0 27.5 39.0

29.0 42.0 60.0

150 350

500 850 1300 µMho

120 160

µA

110 180

µA

2.5

A/V

0.35

V

0.9

V

80

90

%

1.8 2.7

V

10

15

mA

30

45

 2006 Semtech Corp.

3

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