LTC2920-2CMS8#TR Linear Technology, LTC2920-2CMS8#TR Datasheet - Page 12

• Manufacturer Part Number: LTC2920-2CMS8#TR
• Description: IC SNGL/DUAL PWR SUP CTRLR 8MSOP
• Manufacturer: Linear Technology

Specifications of LTC2920-2CMS8#TR

• Applications: Single/Dual Power Supply Controller
• Voltage - Supply: 2.3 V ~ 6 V
• Current - Supply: 230µA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Voltage - Input: -

LTC2920-1/LTC2920-2
APPLICATIO S I FOR ATIO
PREVENTING POTENTIAL POWER SUPPLY
OVERVOLTAGES
Care must be taken when selecting the power source for
the LTC2920. If V
the power supply being margined is on, undesired I
current can flow into the I
cause the margined power supply to create an overvoltage
condition causing serious damage to power supply and its
load. The best solution is to connect the LTC2920 to a
power source that is guaranteed to be on when the power
supply being margined is on. Often this is the input or
output voltage of the power supply being margined. See
the design guidelines below for the best solution for your
application. Be sure to follow all other LTC2920 design
specifications.
At a minimum, the voltage at the V
must be maintained above 0.2V below the highest voltage
present at the I
current below 5μA. The voltage at the I
normally the voltage at the feedback node of the power
supply. See the power supply manufacturer’s data sheet
for this voltage.
PREVENTING I
Connecting V
Supply Being Margined
Connecting the LTC2920-1 V
choice and should be used when conditions permit. It
requires no external components and provides the best
protection from power supply overvoltage.
If the power supply being margined has a V
is within the LTC2920’s V
V
If the power supply being margined has a V
is within the LTC2920’s V
V
the power supply voltage is within the LTC2920’s V
specification when the power supply is being margined!
12
CC
CC
pin to the power supplies V
pin to the power supplies V
CC
M1
M
to the Power Supply V
FAULT CURRENT IN THE LTC2920-1
CC
and I
U
on the LTC2920 is not powered, and
M2
CC
CC
M
U
pins. This will keep the I
range, connect the LTC2920-1
range, connect the LTC2920-1
pin of the LTC2920. This can
CC
OUT
to V
IN
(Figure 13).
(Figure 14). Make sure
CC
W
IN
pin of the LTC2920
or V
M1
IN
OUT
and I
or V
OUT
IN
voltage that
voltage that
OUT
is the best
M2
U
M
M
pins is
of the
fault
fault
CC
Connecting V
Supply Being Margined
If it is not practical to power the LTC2920-1 from the V
or V
V
ure 15). This solution works with power supply feedback
voltages of less than 1.5V and I
sure to account for the diode drop across all temperatures
to ensure the LTC2920-1 V
are met.
CC
OUT
pin of the LTC2920-1 using a Schottky diode (Fig-
2.3V TO 6V
V
V
IN
of the power supply being margined, connect the
IN
V
Figure 14. Connecting LTC2920-1 to V
IN
Figure 13. Connecting LTC2920-1 to V
CC
Figure 15. Diode Connected V
V
V
IN
IN
to Power Sources Other than the
V
V
FB
V
FB
CC
O
O
V
FB
V
<1.5V
V
O
OUT
OUT
V
OUT
V
CC
OUT
and V
2.3V TO 6V
MARGIN
I
LTC2920-1
I
M
LTC2920-1
M
V
GND
GND
POWER
V
I
V
LTC2920-1
M
CC
CC
MARGIN
GND
V
BAT54C
SCHOTTKY DIODE
CC
currents >30μA. Be
CC
specifications
OUT
2920-1/2 F15
2920-1/2 F14
IN
0.1μF
0.1μF
2920-1/2 F13
0.1μF
292012fa
IN