SC483 View Datasheet(PDF) - Semtech Corporation

Part Name

Description

Manufacturer

SC483

Dual Synchronous Buck Pseudo Fixed Frequency Power Supply Controller

Semtech Corporation 

SC483

POWER MANAGEMENT

Electrical Characteristics (Cont.)

Test Conditions: VBAT = 15V, EN/PSV1=EN/PSV2 = 5V, VCCA1 = VDDP1 = VCCA2 = VDDP2 = 5V, VOUT1 = VOUT2 =1.25V, RTON1 = RTON2 = 1MΩ

Parameter

Conditions

25°C

-40°C to 125°C Units

Min Typ Max Min Max

Controller

Error Comparator Threshold

(FB turn-on threshold)(1)

VCCA = 4.5V to 5.5V

Output Voltage Range

On-Time, VBAT = 2.5V

Minimum Off Time

RTON = 1MΩ

RTON = 500kΩ

VOUT1, VOUT2 Input Resistance

VOUT1, VOUT2 Shutdown

Discharge Resistance

EN/PSV1, EN/PSV2 = GND

FB1, FB2 Input Bias Current

Over-Current Sensing

0.500

1761

936

400

500

22

-1% +1% V

0.5 VCCA V

1497 2025 ns

796 1076

550 ns

kΩ

Ω

-1.0 +1.0 µA

ILIM Source Current

Current Comparator Offset

PSAVE

DL high

PGND - ILIM

10

9

11

µA

-10

10 mV

Zero-Crossing Threshold

(PGND - LX), EN/PSV = 5V

5

mV

Fault Protection

Current Limit (Positive) (2)

Current Limit (Negative)

(PGND - LX), RILIM = 5kΩ

(PGND - LX), RILIM = 10kΩ

(PGND - LX), RILIM = 20kΩ

(PGND - LX)

Output Under-Voltage Fault

With respect to internal ref.

Output Over-Voltage Fault - OUT1 With respect to internal ref.

Output Over-Voltage Fault - OUT2 With respect to internal ref.

Over-Voltage Fault Delay

FB forced above OV Threshold

PGD Low Output Voltage

Sink 1mA

PGD Leakage Current

FB in regulation, PGD = 5V

PGD UV Threshold

With respect to internal ref.

50

100

200

-125

-30

+16

+16

5

-10

35

65 mV

80

120 mV

170 230 mV

-160 -90 mV

-40

-25

%

+12 +20

%

+12 +20

%

µs

0.4

V

1

µA

-12

-8

%

 2005 Semtech Corp.

3

www.semtech.com

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