LM2648 National Semiconductor, LM2648 Datasheet - Page 4

• Manufacturer Part Number: LM2648
• Description: Synchronous Step-Down 3-Channel Switching Regulator Controller
• Manufacturer: National Semiconductor

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System
∆V
∆V
V
V
I
VLIN5
Current Limit
V
V
V
Soft Start
I
I
I
I
I
VIN
ss1/2_SC
ss3_SC
ss1/2_SK
ss3_SK
SC_TD12-3
FB1
FB3
Clos1, 2, 3
CLx1, 2, 3
RILIM
Absolute Maximum Ratings
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Electrical Characteristics
Unless otherwise specified, V
type apply over the full operating junction temperature range. Specifications appearing in plain type are measured using low
duty cycle pulse testing with T
Voltages from the indicated pins to SGND/PGND:
VIN, ILIMx, KS3a, KS3b
SWx, RSNSx
FB1, FB2, FB3x, VDDx,ON/UVLO
COMPx, FAULT_DELAY, SSx
CBOOT1 to SW1, CBOOT2 to SW2,
CBOOT3x to SW3x
LDRV1, LDRV2, LDRV3x
HDRV1 to SW1, HDRV2 to SW2,
HDRV3x to SW3x
OUT
OUT
Symbol
, V
/V
/V
FB2
OUT
OUT
Load Regulation
Line Regulation
Feedback Voltage
Feedback Voltage
Input Supply Current
VLIN5 Output Voltage
Current Limit
Comparator Offset
(V
Current Limit Sink
Current
ILIM Reference Voltage
Soft-Start Source
Current
Soft-Start Source
Current
Soft-Start Sink Current
Soft-Start Sink Current
Delay Timer Source
Current
ILIMX
-V
Parameter
RSNSX
IN
)
A
= 12V, SGND = PGND = 0V, VLIN5 = VDD1 = VDD2 = VDD3x. Limits appearing in boldface
= 25˚C (Note 5), (Note 6). Min/Max limits are guaranteed by design, test, or statistical analysis.
−0.3V to (VLIN5 +
VIN = 12V, V
V
5.5V ≤ VIN ≤ 18V, V
5.5V ≤ VIN ≤ 18V
5.5V ≤ VIN ≤ 18V
V
5.5V ≤ VIN ≤ 18V
Standby
1.5V
Shutdown (Note 7)
V
IVLIN5 = 0 to 50mA,
7V ≤ VIN ≤ 18V
R
V
V
V
V
V
−0.3V to (VIN +
comp3
ON/UVLO
ON/UVLO
ss
ss
ss1/2, 3
ss1/2, 3
TD
ILIM
−0.3V to 20V
= 1V
= 1V
(Note 1)
(VDD+0.3)V
= 1.5V
−0.3V to 7V
−0.3V to 7V
<
= 1.238/20µA
= 0.5V to 1.5V
V
−0.3V to
= 1V, ON/UVLO = 1.6V
= 1V, ON/UVLO = 1.6V
ON/UVLO
>
= 0V
−0.3V
0.3)V
0.3)V
2.25V (not switching)
Conditions
comp1, 2
<
4
compx
1.7V
= 1V to 3V,
Operating Ratings
HDRV1 to CBOOT1, HDRV2 to
CBOOT2, HDRV3x to CBOOT3x
Power Dissipation (T
(Note 2)
Ambient Storage Temperature
Range
Soldering Dwell Time, Temperature
(Note 3)
ESD Rating (Note 4)
VIN (VIN and VLIN5 separate)
VIN (VIN tied to VLIN5)
Junction Temperature
=1.25V
Infrared
Vapor Phase
1.218
1.220
4.65
18.2
Min
0.5
0.5
6.2
2
2
A
= 25˚C),
1.239
1.241
1.238
(Note 1)
1.66
2.05
2.05
Typ
.04
.04
5.0
4.9
5.0
9.8
45
20
0
1.260
1.262
−65˚C to +150˚C
±
10-20sec, 240˚C
Max
5.35
21.8
13.2
120
2.2
3.8
3.8
7.0
9
9
0˚C to +125˚C
75sec, 219˚C
4.5V to 5.5V
5.5V to 18V
1.3W
Units
0.3V
mA
mV
2kV
µA
µA
µA
µA
µA
µA
µA
%
%
V
V
V
V