SC4808B-1 View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
'SC4808B-1' PDF : 28 Pages View PDF
SC4808B-1
POWER MANAGEMENT
Electrical Characteristics (Cont.)
Unless specified: VCC = 12V; CL = 100pF; TA = -40°C to 105°C
Parameter
Test Conditions
Min
Typ
Max
Unit
VCC Under Voltage Lockout
Start Threshold
4.0
4.40
4.5
V
Hysteresis
100
140
180
mV
Line Under Voltage Lockout
Start Threshold
R23 = 14kΩ, R33 = 10kΩ (see page 11) -3% VREF +3%
V
Hysteresis
R23 = 14kΩ, R33 = 10kΩ (see page 11)
5.6% of
VREF
mV
Soft Start
Internal Soft Start Ramp
200
µs/V
Soft Start Duration
Rcs = 1kΩ
(See formula in the application
information section on page 18)
12
µs
Soft Start Delay
140
µs
Oscillator
Oscillator Frequency
Oscillator Ramp
Rosc = 11kΩ, Cosc = 200pF
450
500
550
KHz
VREF/2
V
+0.25
RC pin to GND capacitance
22
pF
Oscillator Frequency Range
50
1000
KHz
Sync/CLOCK
Clock SYNC Threshold
1.0
V
Sync Frequency Range
Bandgap
Fosc*1.3 KHz
Reference Voltage
2.970 3.125 3.280
V
Reference Current
5
mA
Overall
Startup Current
VCC < start threshold
150
µA
Operating Supply Current
FB = 0V, CS = 0V
7
mA
VCC Zener Shunt Voltage
IDD = 10mA
16
V
2006 Semtech Corp.
3
www.semtech.com
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