LTC3770EUH#TR Linear Technology, LTC3770EUH#TR Datasheet - Page 7

• Manufacturer Part Number: LTC3770EUH#TR
• Manufacturer: Linear Technology

Specifications of LTC3770EUH#TR

• Lead Free Status / RoHS Status: Not Compliant

TYPICAL PERFORMANCE CHARACTERISTICS
PIN FUNCTIONS
V
voltage at this pin is ten times the nominal sense voltage
at maximum output current and can be set from 0.5V to
2V by a resistive divider from INTV
voltage defaults to 50mV when this pin is tied to ground,
200mV when tied to INTV
between 0.5V to ground or 2V to INTV
V
connects the error amplifi er input to an external resistive
divider from V
I
Amplifi er Compensation Point. The current comparator
threshold increases with this control voltage. The voltage
ranges from 0V to 2.4V with 0.75V corresponding to zero
sense voltage (zero current).
SGND (Pin 4/Pin 7): Signal Ground. All small-signal
components and compensation components should
connect to this ground, which in turn connects to PGND
at one point.
MARGIN1 (Pin 5/Pin 8): The MSB Logic Input for the
Margining Function. Together with the MARGIN0 pin
determines whether the IC is in margin high, margin low,
or no margin state. This pin has a 50k internal pull-down
resistor.
TH
RNG
FB
(Pin 3/Pin 6): Current Control Threshold and Error
(Pin 2/Pin 5): Error Amplifi er Feedback Input. This pin
(Pin 1/Pin 4): Sense Voltage Range Input. The
OUT
160
140
120
100
80
60
40
20
0
.
0
Current Limit Foldback
V
RNG
0.1
= 1V
(UH Package/G Package)
CC
0.2
. Do not set this voltage
V
FB
0.3
CC
(V)
. The nominal sense
0.4
CC
.
0.5
3770 G21
0.6
MARGIN0 (Pin 6/Pin 9): The LSB Logic Input for the
Margining Function. Together with the MARGIN1 pin
determines whether the IC is in margin high, margin low,
or no margin state. This pin has a 50k internal pull-down
resistor.
I
from this pin to ground to set the one-shot timer current
and thereby set the switching frequency.
V
The voltage at this pin must be greater than 0.5V and
less than 1V.
V
Output. The maximum current sinking limit is 50μA at
this pin. Do not put a fi lter capacitor larger than 100pF
on this pin.
MPGM (Pin 10/Pin 13): Programmable Margining Input.
A resistor from this pin to ground sets the margining
current. This current, together with the resistor between
the V
voltage offset.
TRACK/SS (Pin 11/Pin 14): Output Voltage Tracking and
Soft-Start Input. When the IC is confi gured to be the
master of two outputs, a capacitor to ground at this pin
ON
REFIN
REFOUT
(Pin 7/Pin 10): On-Time Current Input. Tie a resistor
140
120
100
80
60
40
20
REFOUT
0
0
(Pin 8/Pin 11): Error Amplifi er Reference Input.
Ion Current vs V
R
ON
(Pin 9/Pin 12): Buffered Internal 0.6V Reference
= 82k
5
and V
10
INPUT VOLTAGE (V)
REFIN
15
IN
20
pins, determines the margining
25
30
3770 G22
35
LTC3770
3770fc
7