SIP12202 データシートの表示（PDF） - Vishay Semiconductors
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SIP12202 Datasheet PDF : 10 Pages
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SiP12202
Vishay Siliconix
Fault State:
The IC can only enter into Fault mode after the soft
start mode has ended and seven consecutive over cur-
rent condition cycles has occurred. Once it enters the
Fault state, with the High Side MOSFET turned off and
the Low Side MOSFET turned on, any occurring over
current condition will be ignored. The Fault State will
last for seven soft start cycles. After which the IC will
enter Soft Start mode. If the over current condition is
removed the IC will operate normally, otherwise the
over current sequence is repeated. This fault scheme
minimizes thermal stress on the external power MOS-
FET switches
Over Temperature:
When the temperature of the chip goes above 165 °C,
the chip enters into over temperature shutdown. The
High Side gate will be off and the Low Side gate will be
on. Only system monitor circuitry will be active. Once
the temperature of the chip drops below 145 °C, the
chip enters into the normal operation mode.
Power Good:
Power Good State: When the output is above 0.75
times nominal output voltage, the PC signal will be
high to indicate that the output voltage is available for
external use. The PG pin requires a pull up resistor.
Setting the Output Voltage:
An output voltage between 0.8 V and (0.9 V x VIN) 0.6
V and VIN and can be configured by connecting FB pin
to a resistive divider between the output and GND.
Select resistor R2 in the 1 kΩ to 10 kΩ range. R1 is
then given by:
( ) R1 = R2
V OUT− 1
V FB
where VFB = 0.6 V.
VOUT
TYPICAL CHARACTERISTICS
100
95 Vout = 3.3 V
90
85
Vout = 2.5 V
80
75
70
65
60
55
Vin = 5.0 V
50
0
2
4
6
8
10
LOAD CURRENT (A)
EFFICIENCY vs LOAD CURRENT
600
550
Vin = 5.0 V
500
Vin = 2.7 V
450
400
-45
-10
25
60
95
130
TEMPERATURE (°C)
OSCILLATOR FREQUENCY Vs TEMPERATURE
0.615
0.605
Vin = 2.7 V to 5.0 V
R1
FB
R2
0.595
0.585
-45
-10
25
60
95
130
TEMPERATURE (°C)
FEEDBACK THRESHOLD Vs TEMPERATURE
0.6 V
Document Number: 73542
S-52083–Rev. A, 10-Oct-05
www.vishay.com
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