LT1370 Linear Technology, LT1370 Datasheet - Page 5

• Manufacturer Part Number: LT1370
• Description: 500kHz High Efficiency 6A Switching Regulator
• Manufacturer: Linear Technology

TYPICAL PERFORMANCE CHARACTERISTICS
V
sation, current limiting and soft start. It is the output of the
error amplifier and the input of the current comparator.
Loop frequency compensation can be performed with an
RC network connected from the V
Applications Information.
FB: The Feedback pin is used for positive output voltage
sensing and oscillator frequency shifting. It is the invert-
ing input to the error amplifier. The noninverting input of
this amplifier is internally tied to a 1.245V reference.
NFB: The Negative Feedback pin is used for negative
output voltage sensing. It is connected to the inverting
input of the negative feedback amplifier through a 100k
source resistor.
PIN
C
2.2
2.0
1.8
1.6
1.4
1.2
1.0
: The Compensation pin is used for frequency compen-
U
–50
V
Clamp Voltage vs Temperature
C
FUNCTIONS
–25
Pin Threshold and High
U
0
TEMPERATURE ( C)
25
50
U
V
V
C
C
75
HIGH CLAMP
THRESHOLD
100 125 150
W
LT1370 • G10
U
C
pin to ground. See
800
700
600
500
400
300
200
100
0
–50
Feedback Input Current
vs Temperature
V
–25
FB
=V
REF
0
TEMPERATURE ( C)
25
50
S/S: Shutdown and Synchronization Pin. The S/S pin is
logic level compatible. Shutdown is active low and the
shutdown threshold is typically 1.3V. For normal opera-
tion, pull the S/S pin high, tie it to V
synchronize switching, drive the S/S pin between 600kHz
and 800kHz. See Applications Information.
V
10 F or More. The regulator goes into undervoltage lock-
out when V
stops switching and pulls the V
V
and has large currents flowing through it. Keep the traces
to the switching components as short as possible to
minimize radiation and voltage spikes.
GND: Tie all ground pins to a good quality ground plane.
See Applications Information.
IN
SW
75
: Bypass Input Supply Pin with a Low ESR Capacitor,
: The Switch pin is the collector of the power switch
100
LT1370 • G11
125
IN
150
drops below 2.5V. Undervoltage lockout
–20
–50
–10
–30
–40
0
–50
Negative Feedback Input Current
vs Temperature
V
–25
NFB
C
=V
0
pin low.
NFR
IN
TEMPERATURE ( C)
or leave it floating. To
25
50
75
LT1370
100 125 150
LT1370 • G12
5