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NCP1587 Datasheet(PDF) 4 Page - ON Semiconductor

Part # NCP1587
Description  Low Voltage Synchronous Buck Controller
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP1587 Datasheet(HTML) 4 Page - ON Semiconductor

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NCP1587, NCP1587A
http://onsemi.com
4
ELECTRICAL CHARACTERISTICS (0_C < TA < 70_C; 4.5 V < VCC < 13.2 V, 4.5 V < [BST−PHASE] < 13.2 V, 4.5 V < BST < 30 V,
0 V < PHASE < 21 V, CTG = CBG = 1.0 nF, for min/max values unless otherwise noted.)
Characteristic
Conditions
Min
Typ
Max
Unit
Input Voltage Range
4.5
13.2
V
Boost Voltage Range
4.5
26.5
V
Supply Current
Quiescent Supply Current
VFB = 1.0 V, No Switching, VCC = 13.2 V
1.0
8.0
mA
Boost Quiescent Current
VFB = 1.0 V, No Switching, VCC = 13.2 V
0.1
1.0
mA
Under Voltage Lockout
UVLO Threshold
VCC Rising Edge
3.8
4.2
V
UVLO Hysteresis
350
mV
Switching Regulator
VFB Feedback Voltage,
Control Loop in Regulation
TA = 0 to 70°C
792
800
808
mV
Oscillator Frequency
NCP1587
NCP1587A
TA = 0 to 70°C
250
180
275
200
300
220
kHz
Ramp−Amplitude Voltage
0.8
1.1
1.4
V
Minimum Duty Cycle
0
%
Maximum Duty Cycle
70
75
80
%
Error Amplifier (GM)
Transconductance
3.0
4.4
mmho
Open Loop DC Gain
55
70
DB
Output Source Current
Output Sink Current
VFB < 0.8 V
VFB > 0.8 V
80
80
120
120
mA
Input Bias Current
0.1
1.0
mA
Soft−Start
SS Source Current
VFB < 0.8 V
8.49
11
13.3
mA
Switch Over Threshold
VFB = 0.8 V
100
% of Vref
Gate Drivers
Upper Gate Source
VCC = 12 V, VTG = VBG = 2.0 V
1.0
A
Upper Gate Sink
1.0
A
Lower Gate Source
1.0
A
Lower Gate Sink
2.0
A
TG Falling to BG Rising Delay
VCC = 12 V, TG < 2.0 V, BG > 2.0 V
40
90
ns
BG Falling to TG Rising Delay
VCC = 12 V, BG < 2.0 V, TG > 2.0 V
35
90
ns
Enable Threshold
0.3
0.4
0.5
V
Over−Current Protection
OCSET Current Source
Sourced from BG pin, before SS
9.89
10
11.1
mA
OC Switch−Over Threshold
700
mV
Fixed OC Threshold
−375
mV


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