LTC2920-2 Linear Technology, LTC2920-2 Datasheet - Page 4

• Manufacturer Part Number: LTC2920-2
• Description: Single/Dual Power Supply Margining Controller
• Manufacturer: Linear Technology

PI FU CTIO S
LTC2920-1/LTC2920-2
V
are powered from this pin. V
low noise power supply voltage between 2.3V and 6V and
should be bypassed with at least a 0.1μF capacitor to the
GND pin in close proximity to the LTC2920. Current
sourced out of the I
that V
controlled power supply turns on or damage to the load
may result. See Preventing Potential Power Supply Over-
voltages in the Applications Information section for power
sequencing considerations. In certain applications, it may
be necessary to further isolate V
series with its power source. See V
Applications Information section.
GND (Pin 2/Pin 6): Ground. All internal circuits are re-
turned to the GND pin. Connect this ground pin to the
ground of the power supply(s) being margined. Current
sunk into the I
through this pin.
R
used to set the margining current which is sourced out of
or sunk into the I
either V
value between 6k and 200k. Connecting R
sets the current at the I
Connecting R
a multiplier of 30. If R
appear at the R
through R
4
1V) will appear at the R
CC
S1
U
(Pin 1/Pin 8): Power Supply Input. All internal circuits
(Pin 4/Pin 4): I
CC
CC
must come up no later than the time the
SET
or ground with an external resistor R
U
SET
M
will be ≈1V/R
S1
pins of the LTC2920 is returned to ground
M1
to V
pin. If R
pin. The R
M
M1
CC
U
SET
pins comes from the V
sets the current at the I
Current Set Input. The R
S1
is connected to ground, ≈1V will
SET
M1
pin. In either case, the current
SET
(S5 Package/MS8 Package)
CC
is connected to V
S1
pin with a multiplier of 1.
.
should be connected to a
CC
pin must be connected to
CC
by adding a resistor in
Power Filtering in the
SET
CC
CC
M1
to ground
SET
pin. Note
, ≈(V
S1
pin with
with a
pin is
CC
–
I
connected to the power supply feedback pin or voltage
adjust pin. (See the Applications Information section for
further details.) Current is either sourced out of or sunk
into this pin. The direction of the current is controlled by
the IN1 pin. The amount of current flowing into or out of
the I
IN1 (Pin 5/Pin 3): I
pin which controls the I
V
below V
pin is left floating, or held between 1.1V and 1.4V, the I
pin is a high impedance output. Internally, the IN1 pin is
connected to a 1.2V voltage source by an internal ~10k
resistor. The LTC2920 has an internal RC circuit to sup-
press noise entering from this pin.
LTC2920-2 Only
R
I
I
margin current output for the LTC2920. See I
IN2 (NA/Pin 2): I
current at the I
M1
M2
M2
IH
S2
, current is sunk into the I
. See R
(NA/Pin 7): I
(Pin 3/Pin 5): I
(NA/Pin 1): I
M1
pin is controlled by the R
IL
, current is sourced from the I
S1
.
M2
M2
M2
M1
M2
pin. See IN1.
M1
Current Output. This pin is the second
Current Set Input. Sets the current for
Control Pin. This pin is a 3-level input
Control Pin. This pin controls the
Current Output. This pin should be
M1
pin. If the IN1 pin is pulled above
M1
pin. If the IN1 pin is pulled
www.DataSheet4U.com
S1
pin.
M1
pin. If the IN1
M1
.
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M1