LM2642MTC/NOPB National Semiconductor, LM2642MTC/NOPB Datasheet - Page 6

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LM2642MTC/NOPB

Manufacturer Part Number
LM2642MTC/NOPB
Description
IC CTRLR SW SYNC STPDN 28TSSOP
Manufacturer
National Semiconductor
Datasheet

Specifications of LM2642MTC/NOPB

Applications
Embedded systems, Console/Set-Top boxes
Current - Supply
1mA
Voltage - Supply
4.5 V ~ 30 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
28-TSSOP
Dc To Dc Converter Type
Synchronous Step Down Controller
Number Of Outputs
2
Pin Count
28
Input Voltage
4.5 to 30V
Output Voltage
1.3 to 30V
Output Current
20A
Package Type
TSSOP
Mounting
Surface Mount
Operating Temperature Classification
Automotive
Operating Temperature (min)
-40C
Operating Temperature (max)
125C
Primary Input Voltage
30V
No. Of Outputs
1
No. Of Pins
28
Operating Temperature Range
-40°C To +125°C
Msl
MSL 3 - 168 Hours
Control Mode
Current
Rohs Compliant
Yes
For Use With
LM2642REVD EVAL - BOARD EVALUATION LM2642
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
*LM2642MTC
*LM2642MTC/NOPB
LM2642MTC
www.national.com
I
I
I
I
I
gm1, gm2
GI
GI
Voltage References and Linear Voltage Regulators
UVLO
Logic Outputs
I
I
FB1
comp1_SC
comp2_SC
comp1_SK
comp2_SK
OL
OH
Electrical Characteristics
Unless otherwise specified, V
over the specified operating junction temperature range, (-20˚C to +125˚C, if not otherwise specified). Specifications appearing
in plain type are measured using low duty cycle pulse testing with T
by design, test, or statistical analysis.
Note 1: Absolute maximum ratings indicate limits beyond which damage to the device may occur. Operating Range indicates conditions for which the device is
intended to be functional, but does not guarantee specfic performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics.
The guaranteed specifications apply only for the test conditions. Some performance characteristics may degrade when the device is not operated under the listed
test conditions.
Note 2: ON/SS1 and ON/SS2 are internally pulled up to one diode drop above VLIN5. Do not apply an external pull-up voltage to these pins. It may cause damage
to the IC.
Note 3: The maximum allowable power dissipation is calculated by using P
ambient temperature and θ
for T
if the temperature exceeds the maximum junction temperature of the device.
Note 4: For detailed information on soldering plastic small-outline packages, refer to the Packaging Databook available from National Semiconductor Corporation.
Note 5: For testing purposes, ESD was applied using the human-body model, a 100pF capacitor discharged through a 1.5kΩ resistor.
Note 6: A typical is the center of characterization data measured with low duty cycle pulse tsting at T
Note 7: All limits are guaranteed. All electrical characteristics having room-temperature limits are tested during production with T
are guaranteed by correlating the electrical characteristics to process and temperature variations and applying statistical process control.
Note 8: Both switching controllers are off. The linear regulator VLIN5 remains on.
Note 9: The output voltage at the VLIN5 pin may be as high as 5.9V in shutdown mode (ON/SS1 = ON/SS2 = 0V).
Note 10: When SS1 and SS2 pins are charged above this voltage and either of the output voltages at Vout1 or Vout2 is still below the regulation limit, the under
voltage protection feature is initialized.
SNS1
SNS2
Symbol
, I
JMAX
FB2
,
,
,
, T
A
, and θ
Feedback Input Bias
Current
COMP Output Source
Current
COMP Output Sink
Current
Transconductance
Current Sense Amplifier
(1&2) Gain
VLIN5 Under-voltage
Lockout
Threshold Rising
PGOOD Low Sink
Current
PGOOD High Leakage
Current
JA
respectively. A θ
Parameter
JA
is the junction-to-ambient thermal resistance of the specified package. The 1.1W rating results from using 125˚C, 25˚C, and 90.6˚C/W
IN
JA
= 15V, GND = PGND = 0V, VLIN5 = VDD1 = VDD2. Limits appearing in boldface type apply
of 90.6˚C/W represents the worst-case condition of no heat sinking of the 28-pin TSSOP. A thermal shutdown will occur
V
V
V
0˚C to 125˚C
-40˚C to 125˚C
V
V
0˚C to 125˚C
-40˚C to 125˚C
V
ON/SS1, ON/SS2 transition
from low to high
V
V
FB1_FIX
FB1_FIX
COMP1
FB1_FIX
COMP1
COMPx
PGOOD
PGOOD
(Continued)
= V
= V
= 1.25V
= 0.4V
= 5V
= 1.5V, V
= V
= V
COMP2
COMP2
FB2_FIX
FB2_FIX
Conditions
DMAX
FB2_FIX
= 1V
= 0.5V
= 1V,
= 1.5V and
6
= (T
JMAX
= 1.5V
A
= 25˚C (Note 6), (Note 7). Min/Max limits are guaranteed
- T
A
)/θ
JA
, where T
A
= 25˚C. Typicals are not guaranteed.
JMAX
0.60
Min
4.2
3.6
18
32
18
32
6
6
is the maximum junction temperature, T
0.95
Typ
113
108
650
5.2
4.0
65
A
5
= T
J
= 25˚C. All hot and cold limits
±
Max
200
7.5
4.4
200
A
Units
µmho
mA
is the
nA
µA
µA
nA
V

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