LTC1772 Linear Technology, LTC1772 Datasheet - Page 3

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LTC1772

Manufacturer Part Number
LTC1772
Description
Constant Frequency Current Mode Step-Down DC/DC Controller in SOT-23
Manufacturer
Linear Technology
Datasheet

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TYPICAL PERFORMANCE CHARACTERISTICS
PIN
I
serves as the error amplifier compensation point as well as
the run control input. The current comparator threshold
increases with this control voltage. Nominal voltage range
for this pin is 0.7V to 1.9V. Forcing this pin below 0.35V
causes the device to be shut down. In shutdown all
functions are disabled and the PGATE pin is held high.
GND (Pin 2): Ground Pin.
TH
825
820
815
810
805
800
795
790
785
780
775
/RUN (Pin 1): This pin performs two functions. It
U
–55
Reference Voltage
vs Temperature
V
IN
FUNCTIONS
–35
= 4.2V
–15
U
TEMPERATURE ( C)
5
130
120
110
100
25
90
80
70
60
50
20
Maximum (V
vs Duty Cycle
45
U
30
65
40
W
85 105
DUTY CYCLE (%)
1772 G01
50
IN
U
– SENSE
125
60
70
) Voltage
80
–10
V
T
–2
–4
–6
–8
10
IN
A
8
6
4
2
0
= 25 C
–55
= 4.2V
90
Normalized Oscillator Frequency
vs Temperature
1772 G04
V
IN
–35
100
= 4.2V
–15
TEMPERATURE ( C)
5
25
V
nal resistive divider across the output.
SENSE
parator.
V
Pin 2.
PGATE (Pin 6): Gate Drive for the External P-Channel
MOSFET. This pin swings from 0V to V
45
FB
IN
(Pin 5): Supply Pin. Must be closely decoupled to GND
(Pin 3): Receives the feedback voltage from an exter-
65
600
560
520
480
440
400
360
320
280
240
200
85 105
(Pin 4): The Negative Input to the Current Com-
–55
Shutdown Threshold
vs Temperature
V
1772 G02
IN
–35
= 4.2V
125
–15
TEMPERATURE ( C)
5
2.24
2.20
2.16
2.12
2.08
2.04
2.00
1.96
1.92
1.88
1.84
25
–55
Undervoltage Lockout Trip
Voltage vs Temperature
45
V
V
IN
IN
–35
= 4.2V
FALLING
65
–15
85 105
TEMPERATURE ( C)
5
1772 G05
25
125
IN
.
45
LTC1772
65
85 105
1772 G03
3
125

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