XR76121ELMTR-F Datasheet, PDF (3/19 Pages) Exar Corporation – PowerBlox 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
Reference Voltage
V_REF
Reference voltage
DC load regulation
DC line regulation
Programmable Constant On-Time
On-time 1
f corresponding to on-time 1
On-time 2
f corresponding to on-time 2
On-time 3
Minimum off-time
Diode Emulation Mode
Zero crossing threshold
Soft-Start
I_{SS_CHARGE} Charge current
I_{SS_DISCHARGE} Discharge current
V_CC Linear Regulator
V_CC
Output voltage
Power Good Output
Power good threshold
Power good hysteresis
Power good
Power good, unpowered
Power good assertion delay,
FB rising
Power good de-assertion delay,
FB falling
V_IN = 5V - 22V, V_CC regulating
0.597
0.600
0.603
V
V_IN = 4.5V - 5.5V, V_CC tied to V_IN
0.596
0.600
0.604
V
V_IN = 5V - 22V, V_CC regulating
V_IN = 4.5V - 5.5V, V_CC tied to V_IN
• 0.594
0.600
0.606
V
CCM operation, closed loop,
applies to any C_OUT
±0.1
%
±0.1
%
R_ON = 5.90kΩ, V_IN = 12V
V_OUT = 1.0V
R_ON = 16.2kΩ, V_IN = 12V
V_OUT = 3.3V
R_ON = 3.01kΩ, V_IN = 12V
•
170
200
230
ns
360
415
490
kHz
•
425
500
575
ns
478
550
647
kHz
•
90
110
135
ns
•
250
350
ns
DC value measured during test
-2
mV
Fault present
•
-14
-10
-6
µA
•
1
3
mA
V_IN = 6V to 22V, I_LOAD = 0 to 30mA
•
4.8
5.0
5.2
V_IN = 5V, R_ON = 16.2kΩ,
f_SW = 678kHz
•
4.6
4.8
V
Minimum I_SINK = 1mA
I_SINK = 1mA
-10
-7.5
-5
%
1
4
%
0.2
V
0.5
V
2
ms
65
µs
REV1A
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