6
LT3150
3150f
SHDN2 Low Clamp Voltage
vs Temperature
SHDN2 Hysteresis vs Temperature
SHDN2 High Clamp Voltage
vs Temperature
TYPICAL PERFOR A CE CHARACTERISTICS
W
TEMPERATURE (癈)
75
0.15
0.20
0.25
125
3150 G19
0.10
0.05
0
25
25
75
50
150
0
50
100
175
TEMPERATURE (癈)
1.5
1.7
1.9
2.1
1.6
1.8
2.0
25
25
75
125
3150 G20
175
50
75
0
50
100
150
TEMPERATURE (癈)
75
110
130
150
125
3150 G21
90
70
100
120
140
80
60
50
25
25
75
50
150
0
50
100
175
U
U
PI FU CTIO S
SW (Pin 1): Boost Converter Switch Pin. Connect induc-
tor/diode here. Minimize trace area at this pin to keep EMI
down.
SWGND (Pin 2): Switch Ground. Tie directly to the local
ground plane and the GNDs at Pins 6 and 15.
V
IN1
 (Pin 3): Boost Converter Input Supply Pin. Must be
locally bypassed.
SHDN2 (Pin 4): This is a multifunction shutdown pin that
provides GATE drive latchoff capability. A 15礎 current
source, that turns on when current limit is activated,
charges a capacitor placed in series with SHDN2 to GND
and performs a current limit time-out function. The pin is
also the input to a comparator referenced to V
REF
 (1.21V).
When the pin pulls above V
REF
, the comparator latches the
gate drive to the external MOSFET off. The comparator
typically has 100mV of hysteresis and the SHDN2 pin can
be pulled low to reset the latchoff function. This pin
provides overvoltage protection or thermal shutdown
protection when driven from various resistor divider
schemes.
TEMPERATURE (癈)
75
15
13
11
125
3150 G18
17
19
16
14
12
18
20
10
25
25
75
50
150
0
50
100
175
SHDN2 Source Current
vs Temperature
Linear Regulator Controller
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