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LT3477
TYPICAL PERFORMANCE CHARACTERISTICS
Current Sense Voltage
vs Temperature
Current Sense Voltage vs I ADJ
104
103
102
101
120
100
80
V CM = 10V
100
V CM = 10V
60
99
98
97
V CM = 42V
40
20
96
–50 –25
0
25
50
75
100
125
0
0
100 200 300 400 500 600 700 800
TEMPERATURE (°C)
3477 G14
PIN FUNCTIONS (QFN/TSSOP)
NC (Pins 1, 2, 20/Pins 18, 19, 20): No Connect Pin. Okay
to connect to ground or V IN , or to ?oat.
V IN (Pin 3/Pin 1): Input Supply. Must be locally bypassed.
Powers the internal control circuitry.
R T (Pin 4/Pin 2): Timing Resistor Pin. Adjusts the switch-
ing frequency. Connect a 17.2k resistor between R T and
GND for a 1MHz switching frequency. Do not leave this pin
open. See Table 4 for additional R T values and switching
frequencies.
SHDN (Pin 5/Pin 3): Shutdown. Tie to 2V or greater to
enable the device. Tie below 0.3V to turn off the device.
SS (Pin 6/Pin 4): Soft-Start. Place a soft-start capacitor
here. Leave ?oating if not in use.
V C (Pin 7/Pin 5): Compensation Pin for Error Ampli?er.
Connect a series RC from this pin to GND. Typical values
are 1k Ω and 4.7nF.
FBN (Pin 8/Pin 6): The Inverting Input to the Error Ampli-
?er. Connect resistive divider tap here for positive output
voltage.
I ADJ VOLTAGE (mV)
2477 G13
FBP (Pin 9/Pin 7): The Noninverting Input to the Error
Ampli?er. Connect resistive divider tap here for negative
output voltage.
V REF (Pin 10/Pin 8): Bandgap Voltage Reference. Inter-
nally set to 1.235V. Connect this pin to FBP if generat-
ing a positive output or to an external resistor divider if
generating a negative voltage. This pin can provide up
to 100μA of current and can be locally bypassed with a
100pF capacitor.
I ADJ2 (Pin 11/Pin 9): Second Current Sense Adjustment.
Setting I ADJ2 to be less than 625mV leads to adjustment of
the sensed voltage of the second current sense ampli?er
linearly. If I ADJ2 is tied to higher than 650mV, the default
current sense voltage is 100mV. If current sense ampli?er 2
is not used, always tie I ADJ2 to higher than 650mV.
I ADJ1 (Pin 12/Pin 10): First Current Sense Adjustment.
Setting I ADJ1 to be less than 625mV leads to adjustment
of the sensed voltage of the ?rst current sense ampli?er
linearly. If I ADJ1 is tied to higher than 650mV, the default
current sense voltage is 100mV. If current sense ampli?er 1
is not used, always tie I ADJ1 to higher than 650mV.
3477fc
5
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