sip12202 Vishay, sip12202 Datasheet - Page 5

• Manufacturer Part Number: sip12202
• Description: Synchronous Step Down Controller
• Manufacturer: Vishay

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 0.6 V and V
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:
where VFB = 0.6 V
Document Number: 73542
S-52332–Rev. B, 07-Nov-05
R
1
=
R
VOUT
2
(
V
V
R2
R1
OUT
FB
−
1
)
FB
0.6 V
IN
and can be
New Product
TYPICAL CHARACTERISTICS
0.615
0.605
0.595
0.585
600
550
500
450
400
100
95
90
85
80
75
70
65
60
55
50
-45
-45
0
Vout = 3.3 V
OSCILLATOR FREQUENCY Vs TEMPERATURE
FEEDBACK THRESHOLD Vs TEMPERATURE
-10
-10
2
EFFICIENCY vs LOAD CURRENT
LOAD CURRENT (A)
TEMPERATURE (°C)
TEMPERATURE (°C)
25
4
25
Vishay Siliconix
60
6
60
Vin = 2.7 V to 5.0 V
Vout = 2.5 V
Vin = 5.0 V
Vin = 2.7 V
SiP12202
Vin = 5.0 V
www.vishay.com
95
95
8
130
10
130
5