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NCP1597B
ELECTRICAL CHARACTERISTICS
(V in = 4.0 V ? 5.5 V, V out = 1.2 V, T J = +25 ° C for typical value; ? 40 ° C < T A < 85 ° C for min/max values unless noted otherwise)
Parameter
V in Input Voltage Range
V CC UVLO Threshold
Symbol
V in
Test Conditions
Min
4.0
3.2
Typ
3.5
Max
5.5
3.8
Unit
V
V
UVLO Hysteresis
335
mV
V CC Quiescent Current
V CCP Quiescent Current
V in Shutdown Supply Current (Note 2)
I inVCC
I inVCCP
I QSHDN
V in = 5 V,V FB = 1.5 V, (No Switching)
V in = 5 V,V FB = 1.5 V, (No Switching)
EN = 0 V
1.7
25
1.8
2.0
3.0
mA
m A
m A
FEEDBACK VOLTAGE
Reference Voltage
Feedback Input Bias Current
Feedback Voltage Line Regulation
V FB
I FB
V FB = 0.8 V
V in = 4.0 V to 5.5 V
0.788
0.800
10
0.06
0.812
100
V
n A
%/V
PWM
Maximum Duty Cycle (regulating)
Minimum Controllable ON Time (Note 2)
82
85
50
%
ns
PULSE ? BY ? PULSE CURRENT LIMIT
Pulse ? by ? Pulse Current Limit (Regulation)
Pulse ? by ? Pulse Current Limit (Soft ? Start)
I LIM
I LIMSS
2.7
4.0
3.9
5.3
4.3
6.1
A
A
OSCILLATOR
Oscillator Frequency
F SW
0.87
1.0
1.13
MHz
MOSFET
High Side MOSFET ON Resistance
High Side MOSFET Leakage (Note 2)
Low Side MOSFET ON Resistance
Low Side MOSFET Leakage (Note 2)
R DS(on)
HS
R DS(on)
LS
I DS = 100 mA, V GS = 5 V
V EN = 0 V, V SW = 0 V
I DS = 100 mA, V GS = 5 V
V EN = 0 V, V SW = 5 V
140
90
200
10
125
10
m W
m A
m W
m A
ENABLE
EN HI Threshold
EN LO Threshold
EN Hysteresis
ENHI
ENLO
1.4
200
0.4
V
V
mV
EN Pullup Current
1.4
3.0
m A
SOFT ? START
Soft ? Start Ramp Time
Hiccup Timer
t SS
F SW = 1 MHz
1.0
2.0
ms
ms
THERMAL SHUTDOWN
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
2. Guaranteed by design. Not production tested.
http://onsemi.com
4
185
30
° C
° C
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