LM2642
Absolute Maximum Ratings
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Voltages from the indicated pins to SGND/PGND:
VIN, ILIM1, ILIM2, KS1, KS2
SW1, SW2, RSNS1, RSNS2
FB1, FB2, VDD1, VDD2
PGOOD, COMP1, COMP2, UV
Delay
ON/SS1, ON/SS2 (Note 2)
CBOOT1 to SW1, CBOOT2 to SW2
LDRV1, LDRV2
HDRV1 to SW1, HDRV2 to SW2
HDRV1 to CBOOT1, HDRV2 to
CBOOT2
−0.3V to 32V
−0.3 to (V
IN
+
0.3)V
−0.3V to 6V
−0.3V to (VLIN5
+0.3)V
−0.3V to (VLIN5
+0.6)V
−0.3V to 7V
−0.3V to
(VDD+0.3)V
−0.3V
+0.3V
Power Dissipation (T
A
= 25˚C),
Ambient Storage Temperature
Range
Soldering Dwell Time, Temperature
Wave
Infrared
Vapor Phase
ESD Rating (Note 5)
1.1W
−65˚C to +150˚C
4 sec, 260˚C
10sec, 240˚C
75sec, 219˚C
2kV
Operating Ratings
VIN (VLIN5 tied to VIN)
VIN (VIN and VLIN5 separate)
Junction Temperature
4.5V to 5.5V
5.5V to 30V
−40˚C to +125˚C
Electrical Characteristics
Unless otherwise specified, V
IN
= 15V, GND = PGND = 0V, VLIN5 = VDD1 = VDD2. Limits appearing in
boldface
type apply
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
A
= 25˚C (Note 6), (Note 7). Min/Max limits are guaranteed
by design, test, or statistical analysis.
Symbol
System
∆V
OUT
/V
OUT
∆V
OUT
/V
OUT
V
FB1_FI2
Load Regulation
Line Regulation
Feedback Voltage
VIN = 15V, V
compx
= 0.5V to 1.5V
5.5V
≤
VIN
≤
30V, V
compx
=1.25V
5.5V
≤
VIN
≤
30V
0˚C to 125˚C
-40˚C to 125˚C
I
VIN
Input Supply Current
V
ON_SSx
>
2V
5.5V
≤
VIN
≤
30V
Shutdown (Note 8)
V
ON_SS1
= V
ON_SS2
= 0V
VLIN5
VLIN5 Output Voltage
IVLIN5 = 0 to 25mA,
5.5V
≤
VIN
≤
30V
-40˚C to 125˚C
V
CLos
Current Limit
Comparator Offset
(VILIMX −VRSNSX)
Current Limit Sink
Current
Soft-Start Source
Current
Soft-Start Sink Current
Soft-Start On Threshold
Soft-Start Timeout
Threshold
UV_DELAY Source
Current
UV-DELAY = 2V
9
-40˚C to 125˚C
V
ON_ss1
= V
ON_ss2
= 1.5V (on)
V
ON_ss1
= V
ON_ss2
= 2V
8.67
0.5
2
0.7
2
5.2
1.12
3.3
2
5
9
4.70
4.68
1.215
1.217
1.212
1.0
2.0
37
5
110
5.30
5.30
0.04
0.04
1.238
1.260
1.259
1.261
mA
µA
V
%
%
Parameter
Conditions
Min
Typ
Max
Units
V
±
2
10
±
7.0
11
11
5.0
10
1.4
mV
I
CL
I
ss_SC1
,
I
ss_SC2
I
ss_SK1
,
I
ss_SK2
V
ON_SS1
,
V
ON_SS2
V
SSTO
I
sc_uvdelay
µA
µA
µA
V
V
µA
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