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LTC1772 Datasheet(PDF) 3 Page - Linear Technology

Part # LTC1772
Description  Constant Frequency Current Mode Step-Down DC/DC Controller in SOT-23
PDF  16 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1772 Datasheet(HTML) 3 Page - Linear Technology

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LTC1772
TYPICAL PERFORMANCE CHARACTERISTICS
Reference Voltage
vs Temperature
Undervoltage Lockout Trip
Voltage vs Temperature
Shutdown Threshold
vs Temperature
Maximum (VIN – SENSE–) Voltage
vs Duty Cycle
Normalized Oscillator Frequency
vs Temperature
PIN FUNCTIONS
ITH/RUN (Pin 1): This pin performs two functions. It
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.
VFB (Pin 3): Receives the feedback voltage from an exter-
nal resistive divider across the output.
SENSE– (Pin 4): The Negative Input to the Current Com-
parator.
VIN (Pin 5): Supply Pin. Must be closely decoupled to GND
Pin 2.
PGATE (Pin 6): Gate Drive for the External P-Channel
MOSFET. This pin swings from 0V to VIN.
TEMPERATURE (
°C)
–55
775
780
790
795
800
825
810
–15
25
45
125
1772 G01
785
815
820
805
–35
5
65
85 105
VIN = 4.2V
TEMPERATURE (
°C)
–55
–10
–8
–4
–2
0
10
4
–15
25
45
125
1772 G02
–6
6
8
2
–35
5
65
85 105
VIN = 4.2V
TEMPERATURE (
°C)
–55
1.84
1.88
1.96
2.00
2.04
2.24
2.12
–15
25
45
125
1772 G03
1.92
2.16
2.20
2.08
–35
5
65
85 105
VIN = 4.2V
VIN FALLING
DUTY CYCLE (%)
20
30
100
1772 G04
40
50
60
70
80
90
130
120
110
100
90
80
70
60
50
VIN = 4.2V
TA = 25°C
TEMPERATURE (
°C)
–55
200
240
320
360
400
600
480
–15
25
45
125
1772 G05
280
520
560
440
–35
5
65
85 105
VIN = 4.2V



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