LTC1872ES6 LINER [Linear Technology], LTC1872ES6 Datasheet - Page 3

• Manufacturer Part Number: LTC1872ES6
• Description: Constant Frequency Current Mode Step-Up 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
0.7V to 1.9V. Forcing this pin below 0.35V causes the
device to be shut down. In shutdown all functions are
disabled and the NGATE pin is held low.
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
130
120
110
100
25
90
80
70
60
50
20
Maximum Current Sense Trip
Voltage vs Duty Cycle
45
U
30
65
40
W
85 105
DUTY CYCLE (%)
1872 G01
50
U
125
60
70
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
1872 G04
V
IN
–35
100
= 4.2V
–15
TEMPERATURE ( C)
5
25
SENSE
parator.
V
Pin 2.
NGATE (Pin 6): Gate Drive for the External N-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
1872 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
1872 G05
25
125
IN
.
LTC1872
45
65
85 105
1872 G03
3
125