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SC418
4
Electrical Characteristics (continued)
Parameter
Conditions
Min  Typ  Max  Units
Input Supplies (continued)
VDDA + VDDP Supply Current
ENL , EN = 0V
3
7    糀
 EN = 5V, R
PSV
 = 5k&, V
FB
 > 500mV
(2)
.5
mA
EN = 5V, PSV = open (float), V
FB
 > 500mV
(2)
0.4
Operating f
SW
 = 250kHz, PSV = VDDA, no load
(2)
0
FB Comparator Threshold
Static VIN and load, 0 to +85 癈
0.496  0.500  0.504   V
Static VIN and load, -40 to +85 癈
0.495
0.505   V
Frequency Range
Continuous mode operation
000   kHz
Timing
On-Time
Forced continuous mode operation,
V
IN
 = 5V, V
OUT
 = 5V, R
TON
 = 300k&, VDDA = 5V
2385   2650   295   ns
VDDA < 4.5V
 (3)
Minimum On-Time
(2)
80
ns
Minimum Off-Time
(2)
250
ns
Ultrasonic Frequency
(2)
Minimum switching frequency, R
PSV
 = 5k&
25
kHz
Soft-Start
Soft-Start Ramp Time
(2)
V
OUT
 ramp from zero to programmed value
850
約
Analog Inputs/Outputs
VOUT Input Resistance
500
k&
Current Sense
Zero Cross Detector Threshold
LX - PGND, VDDA = 5V
-3    0    +3    mV
Power Good
Power Good Threshold
Upper limit, V
FB
 > internal 500mV reference
+20
%
Lower limit, V
FB
 < internal 500mV reference
-0
%
Start-Up Delay Time
Includes Soft-Start Ramp Time, VDDA = 5V
2
ms
Includes Soft-Start Ramp Time, VDDA = 3.3V
(2)

Fault (noise immunity) Delay Time
(2)
5
祍
Leakage
PGOOD = high impedance (open)
    礎
Power Good On Resistance
0
&
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