XRP6141 Datasheet, PDF (3/14 Pages) Exar Corporation – 35A Synchronous Step Down COT Controller

XRP6141
35A Synchronous Step Down COT Controller
Parameter
Min. Typ. Max. Units
Conditions
Programmable Constant On-Time
On-Time 1
1855 2182 2509 ns ^• RON = 141.2kΩ, VIN=22V
f corresponding to On-Time 1
217
250 294 kHz
VIN=22V, VOUT=12V
Minimum Programmable
On-Time
109
ns
RON = 7.059kΩ, VIN=22V
On-Time 2
170
200 230 ns • RON = 7.059kΩ, VIN=12V
f corresponding to On-Time 2
1618 1375 1196 kHz
VOUT=3.3V
f corresponding to On-Time 2
490
417 362 kHz
VOUT=1.0V
On-Time 3
391
460 529 ns • RON = 16.235kΩ, VIN=12V
Minimum Off-Time
250 350 ns •
Diode Emulation Mode
Zero crossing threshold
-4
-1
mV
DC value measured during test
SoftStart
SS Charge current
-14
-10 -6
µA •
SS Discharge current
1
mA • Fault present
VCC Linear Regulator (VCC should be tied to VIN, for 4.5V≤VIN≤5.5V)
VCC Output Voltage
4.8
5.0 5.2
V
• VIN=6V to 22V, Iload=0 to 30mA
4.51
4.7
• VIN=5V, Iload=0 to 20mA
Dropout Voltage
200
300 490 mV • IVCC=30mA
Power Good Output
Power Good Threshold
-10
-7.5 -5
%
Power Good Hysteresis
2
4
%
Power Good Sink Current
1
mA
Protection: OCP, OTP, Short-circuit
Hiccup timeout
110
ms
ILIM pin source current
45
50
55
µA
ILIM current temperature coeff.
0.4
%/°C
OCP comparator offset
-8
0
+8 mV •
Current limit blanking
100
ns
GL rising>1V
Thermal shutdown threshold¹
150
°C
Rising temperature
Thermal Hysteresis¹
15
°C
VSCTH Feedback pin short-circuit
threshold
50
60
70
%
•
Percent of VREF, short circuit is active
After PGOOD is up
Output Gate drivers
GH Pull-Down Resistance
GH Pull-up Resistance
GL Pull-Down Resistance
GL Pull-up Resistance
GH and GL pull-down Resistance
GH and GL rise time
GH and GL fall time
GL to GH non-overlap time
GH to GL non-overlap time
Note 1: Guaranteed by design
1.35 2.0
Ω
1.8 2.8
Ω
1.35 1.9
Ω
1.7 2.7
Ω
50 --- kΩ
35
50
ns
30
40
ns
20
30
60
ns
15
20
40
ns
IGH=200mA
IGH=200mA
IGL=200mA
IGL=200mA
10% to 90%
90% to 10%
Measured GL falling edge =1V to
GH rising edge =1V, BST=VCC, SW=0V
Measured GH falling edge =1V to
GL rising edge =1V
© 2015 Exar Corporation
3/14
Rev. 2.0.0