XRP7662 Datasheet, PDF (3/19 Pages) Exar Corporation – 12A 300KHz Synchronous Step Down Regulator

XRP7 66 2
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1 2 A 3 0 0 KHz Sy n ch r on ou s St ep Dow n Reg u lat or
Parameter
VCC Linear Regulator
VCC output Voltage
Min.
4.7
4.51
Typ.
5.0
4.73
Max.
5.3
Dropout Voltage
250
500
750
Control Loop
Ramp Amplitude
0.80
1.00
1.20
RAMP Offset
1.7
2.0
2.3
Ramp offset Temperature
Coefficient
-2
GH Minimum Pulse Width
50
180
Maximum Controllable Duty
Ratio
92
97
Maximum Duty Ratio
100
Oscillator Frequency
255
300
345
Soft - s tart, Short Circuit, Current Limit and Thermal Protection
SS Charge Current
- 16
- 10
-4
SS Discharge Current
1.0
2.0
3.0
Short Circuit Threshold Voltage
0.2
0.25
0.3
Hiccup Timeo ut
170
220
270
Overcurrent Threshold Voltage
54
60
66
ISP, ISN Common Mode Range
0
3.6
Thermal Shutdown Temperature
135
145
155
Thermal Hysteresis
10
Output Power Stage
High Side Switch RDSON
Synchronous Low Side Switch
RDSON
Maximum Output Current
21
25
9
15
12
Units
Conditions
V
mV
V
V
mV/°C
ns
%
%
KHz
µA
mA
V
ms
mV
V
°C
°C
m:
m:
A
‡ V_IN =6 to 2 2V, I _LOAD=0mA to 30mA
‡ V_IN =5V, I _LOAD=20mA
‡
VIN - VOUT=Dropout voltage when V CC
regulated drops by 2%, IV CC=30mA
‡
‡
‡
‡
‡ Valid for 20 cycles
‡
‡
‡ Fault Present, SS=0.2V
‡
‡ V_FB=0.5V
Measured ISP - ISN
Guaranteed by design
Thermal r ecovery on decreasin g
temperature
VGS=4.5V, I DRAIN =5A, T A=25°C
VGS=4.5V, I DRAIN =5A, T A=25°C
‡
© 2012 Exar Corporation
3/ 19
Rev. 2. 2.0