NB671, 24V, HIGH CURRENT SYNCHRONOUS STEP-DOWN CONVERTER
ELECTRICAL CHARACTERISTICS
VIN = 12V, TJ = 25°C, unless otherwise noted.
Parameters
Symbol Condition
Min
Typ
Max
Units
Supply Current
Supply Current (Shutdown)
Supply Current (Quiescent)
MOSFET
IIN
IIN
VEN = 0V
0
1
μA
μA
VEN = 2V, VFB = 0.65V
100
160
200
High-side Switch On Resistance
Low-side Switch On Resistance
Switch Leakage
HSRDS-ON
LSRDS-ON
SWLKG
30
15
0
mΩ
mΩ
μA
VEN = 0V, VSW = 0V
1
Current Limit
Low-side Valley Current Limit
ILIMIT
8
8.5
9.5
A
Switching frequency and minimum off timer
Switching frequency
Minimum Off Time(6)
FS
400
250
500
300
600
350
kHz
ns
TOFF
Over-voltage and Under-voltage Protection
OVP Threshold
OVP Delay
VOVP
TOVPDEL
VUVP
125% 130% 135%
2.5
VREF
μs
UVP Threshold
UVP Delay
55%
60%
12
65%
VREF
μs
TUVPDEL
Reference And Soft Start
Reference Voltage
Feedback Current
Soft Start Time
VREF
IFB
598
1.5
604
10
610
50
mV
nA
VFB = 0.604V
TSS
1.7
1.95
ms
Enable And UVLO
Enable Input Low Voltage
Enable Hysteresis
VILEN
1.15
1.25
100
5
1.35
V
VEN-HYS
mV
VEN = 2V
EN = 0V
Enable Input Current
IEN
μA
V
0
VCC Under Voltage Lockout
Threshold Rising
VCCVth
4.6
4.85
V
VCC Under Voltage Lockout
Threshold Hysteresis
VCCHYS
480
mV
NB671 Rev. 1.0
1/14/2013
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