LM2642MTC/NOPB

Manufacturer Part NumberLM2642MTC/NOPB
DescriptionIC CTRLR SW SYNC STPDN 28TSSOP
ManufacturerNational Semiconductor
LM2642MTC/NOPB datasheet
 


Specifications of LM2642MTC/NOPB

ApplicationsEmbedded systems, Console/Set-Top boxesCurrent - Supply1mA
Voltage - Supply4.5 V ~ 30 VOperating Temperature-40°C ~ 125°C
Mounting TypeSurface MountPackage / Case28-TSSOP
Dc To Dc Converter TypeSynchronous Step Down ControllerNumber Of Outputs2
Pin Count28Input Voltage4.5 to 30V
Output Voltage1.3 to 30VOutput Current20A
Package TypeTSSOPMountingSurface Mount
Operating Temperature ClassificationAutomotiveOperating Temperature (min)-40C
Operating Temperature (max)125CPrimary Input Voltage30V
No. Of Outputs1No. Of Pins28
Operating Temperature Range-40°C To +125°CMslMSL 3 - 168 Hours
Control ModeCurrentRohs CompliantYes
For Use WithLM2642REVD EVAL - BOARD EVALUATION LM2642Lead Free Status / RoHS StatusLead free / RoHS Compliant
Other names*LM2642MTC
*LM2642MTC/NOPB
LM2642MTC
  
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Electrical Characteristics
Unless otherwise specified, V
= 15V, GND = PGND = 0V, VLIN5 = VDD1 = VDD2. Limits appearing in boldface type apply
IN
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.
Symbol
Parameter
I
, I
Feedback Input Bias
FB1
FB2
Current
I
,
COMP Output Source
comp1_SC
I
Current
comp2_SC
I
,
COMP Output Sink
comp1_SK
I
Current
comp2_SK
gm1, gm2
Transconductance
GI
,
Current Sense Amplifier
SNS1
GI
(1&2) Gain
SNS2
Voltage References and Linear Voltage Regulators
UVLO
VLIN5 Under-voltage
Lockout
Threshold Rising
Logic Outputs
I
PGOOD Low Sink
OL
Current
I
PGOOD High Leakage
OH
Current
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
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
JA
, and θ
respectively. A θ
for T
, T
of 90.6˚C/W represents the worst-case condition of no heat sinking of the 28-pin TSSOP. A thermal shutdown will occur
JMAX
A
JA
JA
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.
www.national.com
(Continued)
= 25˚C (Note 6), (Note 7). Min/Max limits are guaranteed
A
Conditions
V
= 1.5V, V
= 1.5V
FB1_FIX
FB2_FIX
V
= V
= 1V,
FB1_FIX
FB2_FIX
V
= V
= 1V
COMP1
COMP2
0˚C to 125˚C
-40˚C to 125˚C
V
= V
= 1.5V and
FB1_FIX
FB2_FIX
V
= V
= 0.5V
COMP1
COMP2
0˚C to 125˚C
-40˚C to 125˚C
V
= 1.25V
COMPx
ON/SS1, ON/SS2 transition
from low to high
V
= 0.4V
PGOOD
V
= 5V
PGOOD
= (T
- T
)/θ
, where T
DMAX
JMAX
A
JA
A
6
Min
Typ
Max
±
65
200
18
113
32
6
18
108
32
6
650
4.2
5.2
7.5
3.6
4.0
4.4
0.60
0.95
5
200
is the maximum junction temperature, T
JMAX
A
= 25˚C. Typicals are not guaranteed.
= T
= 25˚C. All hot and cold limits
A
J
Units
nA
µA
µA
µmho
V
mA
nA
is the