ncp3121 ON Semiconductor, ncp3121 Datasheet - Page 5

• Manufacturer Part Number: ncp3121
• Description: Dual 3.0 A, Step-down Dc/dc Switching Regulator
• Manufacturer: ON Semiconductor

ELECTRICAL CHARACTERISTICS
noted. R
RECOMMENDED OPERATING CONDITIONS
SUPPLY CURRENT
UNDERVOLTAGE LOCKOUT
SWITCHING REGULATOR
FB
OSC
TRANSCONDUCTANCE ERROR AMPLIFIER (GM)
SOFT-START
Input Voltage Range
Quiescent Supply Current
Shutdown Supply Current
UVLO Threshold
UVLO Hysteresis
Minimum Duty Cycle
Maximum Duty Cycle
High Side MOSFET R
High Side Leakage Current
High Side Switch Current Limit Set Point
Current Loop Transient Response
V
Oscillator Frequency
Standard Oscillator Frequency Range
Transconductance
DC Gain
Unity Gain Bandwidth
Output Sink Current
Output Source Current
Input Bias Current
Comp Pin Operating Voltage Range
Soft-Start Period
Soft-Start Voltage Range
Soft-Start Current Source
FB
Feedback Voltage
T
= open kW)
Characteristic
DS(on)
(-40°C < T
T
J
V
V
J
< 125°C, T
FB
FB
V
No Switching, PG open
= 25°C, T
Discharging, V
V EN = H, V
I
SW
FB
V
Charging, V
V
4.5 V < V
http://onsemi.com
T
= 1.0 V, Vcomp = 1.5 V
= 0.6 V, Vcomp = 1.5 V
T
EN
EN
V
V
J
< 0.8 V, C
J
(RT = 52.3 kW)
Comp = 0.6 V
Comp = 2.6 V
= 0.5 A, T
IN
IN
= -40 to 125°C,
= -40 to 125°C
Conditions
V
T
= 0V, V
= 0 V, PG open
T
T
NCP3121
FB
Falling Edge
J
Rising Edge
(Note 3)
(Note 4)
(Note 4)
(Note 4)
(Note 4)
(Note 4)
J
J
= 25°C,
= 25°C
J
= 25°C
J
= 0.8 V
= 25°C for typical values, V
= -40 to 125°C
IN
5
FB
SW
SS
< 13.2V
S
J
SS
= 1.0 V
= 0.1 mF
= 25°C
= 1 V
= 0V
= 1 V
0.788
0.784
0.15
Min
180
170
635
200
4.5
3.9
3.5
0.9
0.6
6.5
6.5
90
50
80
80
AVIN
0
=12 V, V
0.20
4.15
8.75
8.75
Typ
250
100
200
200
750
100
100
100
5.0
4.3
4.1
0.8
1.0
4.0
55
10
VIN
-
=12 V, unless otherwise
0.812
0.816
Max
13.2
0.25
V
100
220
230
865
750
500
7.0
4.5
4.8
1.1
2.6
10
60
11
11
0
FB
nsec
MHz
Unit
kHz
kHz
kHz
kHz
mW
mA
ms
dB
nA
ms
mA
mA
mA
mA
mA
mA
%
%
V
V
V
A
V
V
V