LTC1772BES6 LINER [Linear Technology], LTC1772BES6 Datasheet - Page 3

• Manufacturer Part Number: LTC1772BES6
• Description: Constant Frequency Current Mode Step-Down DC/DC Controller in SOT-23
• Manufacturer: LINER [Linear Technology]

TYPICAL PERFORMANCE CHARACTERISTICS
PIN
I
serves as the error amplifier compensation point as well as
the run control input. Nominal voltage range for this pin is
0.85V 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.
V
nal resistive divider across the output.
TH
FB
825
820
815
810
805
800
795
790
785
780
775
/RUN (Pin 1): This pin performs two functions. It
U
(Pin 3): Receives the feedback voltage from an exter-
–55
Reference Voltage
vs Temperature
V
IN
FUNCTIONS
–35
= 4.2V
–15
U
TEMPERATURE ( C)
5
120
110
100
25
90
80
70
60
50
40
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
SENSE
parator.
V
Pin 2.
PGATE (Pin 6): Gate Drive for the External P-Channel
MOSFET. This pin swings from 0V to V
45
IN
(Pin 5): Supply Pin. Must be closely decoupled to GND
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
IN
–35
FALLING
65
–15
85 105
TEMPERATURE ( C)
5
1772 G05
25
125
LTC1772B
IN
.
45
65
85 105
1772 G03
3
125