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NCP5425 Datasheet(PDF) 4 Page - ON Semiconductor

Part # NCP5425
Description  Dual Synchronous Buck Controller
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP5425 Datasheet(HTML) 4 Page - ON Semiconductor

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NCP5425
http://onsemi.com
4
ELECTRICAL CHARACTERISTICS (0
°C < TJ < 125°C; ROSC = 30.9 k, CCOMP1,2 = 0.1 µF, 4.75 V < VCC < 13.2 V; 10.8 V
< BST < 20 V, CGATE(H)1,2 = CGATE(L)1,2 = 1.0 nF; unless otherwise specified.)
Characteristic
Test Condition
Min
Typ
Max
Unit
Error Amplifier
VFB1 Input Bias Current
VFB1 = 0 V
0.1
1.0
mA
VFB2, VREF2 Input Bias Current
VFB2, VREF2 = 0.8 V
0.1
1.0
mA
Input Voltage Range
0.3
1.9
V
COMP1(2) Source Current
COMP1(2) = 1.2 V to 2.5 V; VFB1(2) = 0.6 V
15
30
60
mA
COMP1(2) Sink Current
COMP1(2) = 1.2 V; VFB1(2) = 1.0 V
15
30
60
mA
Reference Voltage
COMP1 = VFB1
0.792
0.800
0.808
V
COMP1 Max Voltage
COMP2 Max Voltage, Mode Floating
COMP2 Max Voltage, Mode = 0
VFB1(2) = 0.6 V
VFB1(2) = 0.6 V
VFB1(2) = 0.6 V
3.0
2.0
3.1
2.0
2.1
2.1
V
COMP1(2) Min Voltage
VFB1(2) = 1.2 V
0.10
0.20
V
Open Loop Gain
95
dB
Unity Gain Bandwidth
40
kHz
PSRR @ 1.0 kHz
70
dB
Transconductance
32
mmho
Output Impedance
2.5
M
GATE(H) and GATE(L)
High Voltage (AC)
VCC − GATE(L)1,2
BST − GATE(H)1,2 (Note 2)
0
0.5
V
Low Voltage (AC)
GATE(L)1,2 or GATE(H)1,2 (Note 2)
0
0.5
V
Rise Time
1.0 V < GATE(L)1,2 < VCC − 1.0 V
1.0 V < GATE(H)1,2 < BST − 1.0 V
25
80
ns
Fall Time
VCC − 1.0 > GATE(L)1,2 > 1.0 V
BST − 1.0 > GATE(H)1,2 > 1.0 V
25
80
ns
GATE(H) to GATE(L) Delay
GATE(H)1,2 < 2.0 V
GATE(L)1,2 > 2.0 V
20
40
80
ns
GATE(L) to GATE(H) Delay
GATE(L)1,2 < 2.0 V
GATE(H)1,2 > 2.0 V
20
40
80
ns
GATE(H)1(2) and GATE(L)1(2) Pull−Down
Resistance to GND (Note 2)
50
125
280
k
PWM Comparator
Propagation Delay
COMP1(2) = 1.0 V
VFB1(2) = 0 to 1.2 V
Note 2
200
300
ns
PWM Comparator Offset
VFB1(2) = 0 V; Increase COMP1(2) until
GATE(H)1(2) starts switching
0.20
0.30
0.45
V
Artificial Ramp
Duty Cycle = 50%
55
95
150
mV
Minimum Pulse Width
(Note 2)
80
130
ns
2. Guaranteed by design, not 100% tested in production.


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