LTC1624 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC1624' PDF : 28 Pages View PDF
LTC1624
TYPICAL PERFORMANCE CHARACTERISTICS
VITH vs Output Current
2.4
IITH vs VITH
200
150
1.2
0.8
0
0
ACTIVE
MODE
SHUTDOWN
IOUT
(a)
IOUT(MAX)
1624 G01
Frequency vs Feedback Voltage
250
200
50
ACTIVE
MODE
SHUTDOWN
3
00
0.8 1.2
VITH (V)
(b)
2.4
1624 G02
Operating Frequency vs
Temperature
250
VOUT IN REGULATION
200
150
150
100
100
50
0
0
0.25 0.50 0.75 1.00 1.25
FEEDBACK VOLTAGE
1624 G03
50
VFB = 0V
0
–40 –15
10 35 60 85
TEMPERATURE (°C)
110 135
1448 G12
ITH/RUN Pin Source Current vs
Temperature
300
5
250
4
200
ITH/RUN = 1V
3
150
ITH/RUN = 0V
2
100
1
50
0
–40 –15
10 35 60 85
TEMPERATURE (°C)
0
110 135
1624 G14
Maximum Current Sense
Threshold vs Temperature
170
168
166
164
162
160
158
156
154
152
150
–40 –15
10 35 60 85
TEMPERATURE (°C)
110 135
1448 G13
PIN FUNCTIONS
SENSE – (Pin 1): Connects to the (–) input for the current
comparator. Built-in offsets between the SENSE – and VIN
pins in conjunction with RSENSE set the current trip thresh-
olds. Do not pull this pin more than 15V below VIN or more
than 0.3V below ground.
ITH/RUN (Pin 2): Combination of Error Amplifier Compen-
sation Point and Run Control Inputs. The current com-
parator threshold increases with this control voltage.
Nominal voltage range for this pin is 1.19V to 2.4V. Forcing
this pin below 0.8V causes the device to be shut down. In
shutdown all functions are disabled and TG pin is held low.
VFB (Pin 3): Receives the feedback voltage from an exter-
nal resistive divider across the output.
GND (Pin 4): Ground. Connect to the (–) terminal of COUT,
the Schottky diode and the (–) terminal of CIN.
SW (Pin 5): Switch Node Connection to Inductor. In step-
down applications the voltage swing at this pin is from a
Schottky diode (external) voltage drop below ground to
VIN.
4
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