XR76121 Datasheet, PDF (4/18 Pages) Exar Corporation – PowerBloxTM 20A Synchronous Step-Down COT Regulators

XR76121
Electrical Characteristics (Continued)
Specifications are for operating junction temperature of T_J = 25°C only; limits applying over the full operating junction
temperature range are denoted by a •. Typical values represent the most likely parametric norm at T_J = 25°C, and are
provided for reference purposes only. Unless otherwise indicated, V_IN = 12V, SW = AGND = PGND = 0V, C_VCC = 4.7uF.
Symbol
Parameter
Conditions
• Min
Typ
Max
Units
Mode Control (FCCM)
FCCM mode logic high threshold
FCCM rising
•
2.4
V
FCCM mode logic low threshold
FCCM falling
•
0.4
V
Input leakage current
100
nA
Open Feedback/OVP Detect (VSNS)
OVP trip high threshold
VSNS rising. Specified as % of V_REF •
115
120
125
%
OVP trip low threshold
OVP comparator delay
VSNS falling. Specified as % of V_REF •
115
%
VSNS rising
•
0.5
1
3.5
µs
Delay to turn off power stage from an
overvoltage event
VSNS rising
•
Protection: OCP, OTP, Short-Circuit
3.5
µs
Hiccup timeout
110
ms
I_LIM/R_DS
I_LIM current temperature coefficient
I_LIM comparator offset
14.5
16.2
18.0
µA/mΩ
0.4
%/°C
-4.7
0
4.7
mV
I_LIM comparator offset
Current limit blanking
•
-8.0
0
8.0
mV
100
ns
Thermal shutdown threshold
Rising temperature
138
°C
Thermal hysteresis
15
°C
Feedback pin short-circuit threshold
Percent of V_REF, short circuit is active.
After PGOOD asserts high.
•
50
60
70
%
Output Power Stage
High-side MOSFET R_DS(ON)
Low-side MOSFET R_DS(ON)
I_DS = 2A
I_DS = 2A
7.7
10
mΩ
3.1
3.5
mΩ
Maximum output current
•
20
A
REV1A
4/18