LM2642MTC/NOPB National Semiconductor, LM2642MTC/NOPB Datasheet - Page 6
Manufacturer Part Number
IC CTRLR SW SYNC STPDN 28TSSOP
Specifications of LM2642MTC/NOPB
Embedded systems, Console/Set-Top boxes
Current - Supply
Voltage - Supply
4.5 V ~ 30 V
-40°C ~ 125°C
Package / Case
Dc To Dc Converter Type
Synchronous Step Down Controller
Number Of Outputs
4.5 to 30V
1.3 to 30V
Operating Temperature Classification
Operating Temperature (min)
Operating Temperature (max)
Primary Input Voltage
No. Of Outputs
No. Of Pins
Operating Temperature Range
-40Â°C To +125Â°C
MSL 3 - 168 Hours
For Use With
LM2642REVD EVAL - BOARD EVALUATION LM2642
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Voltage References and Linear Voltage Regulators
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
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
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.
, and θ
Feedback Input Bias
COMP Output Source
COMP Output Sink
Current Sense Amplifier
PGOOD Low Sink
PGOOD High Leakage
respectively. A θ
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
= 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
0˚C to 125˚C
-40˚C to 125˚C
0˚C to 125˚C
-40˚C to 125˚C
ON/SS1, ON/SS2 transition
from low to high
= 1.5V, V
= 1.5V and
= 25˚C (Note 6), (Note 7). Min/Max limits are guaranteed
, where T
= 25˚C. Typicals are not guaranteed.
is the maximum junction temperature, T
= 25˚C. All hot and cold limits