LM2648 National Semiconductor, LM2648 Datasheet - Page 6

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

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I
R
R
Oscillator
F
Don_max1, 2
Don_max3
T
SS
Error Amplifier
I
I
I
GBW1, 2
G1, G2
SR1, 2
V
V
I
I
I
gm3
GI
sk_LDRV
FB1, 2
comp1, 2_SC
comp1, 2_SK
FB3
COMP3_SC
COMP3_SK
Electrical Characteristics
osc
on_min
CLAMPH1, 2
CLAMPL1, 2
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
HDRV
LDRV
SNS3
OT_delta
Symbol
LDRVx Sink Current
HDRVx Source
On-Resistance
HDRVx Sink
On-Resistance
LDRVx Source
On-Resistance
LDRVx Sink
On-Resistance
Oscillator Frequency
Ch. 1, 2 Maximum
On-Duty Cycle
Ch. 3a, 3b Maximum
On-Duty Cycle
Ch.3 Minimum On-Time
HDRVx Delta On Time
Ch. 1, 2 Feedback Input
Bias Current
COMP Output Source
Current
COMP Output Sink
Current
Unity Gain Bandwidth
Error amplifier DC Gain
Slew Rate
Error Amp High Clamp
Error Amp Low Clamp
Ch 3 Feedback Input
Bias Current
COMP Output Source
Current
COMP Output Sink
Current
Transconductance
Ch.3 Current Sense
Amplifier Gain
Parameter
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.
LDRVX = 2.5V
V
V
V
V
HDRV1 and HDRV2
HDRV1 and 2 ; HDRV3a and b
V
V
V
V
V
V
V
(Continued)
CBOOTx
SWx
VDDx
FB1
FB1, 2_
COMP1, 2
COMP1, 2
FB3
comp3
comp3
comp3
= V
= 1.5V
= 0V
= 5V
= 1.5V
= 0.5V
= 1.25V
= 1V
FB2
= 5V,
= 2.6V
= 1.2V
Conditions
= 1V, Measured at pins
6
Min
260
0.5
.21
4.2
91
91
27
27
Typ
300
166
115
111
650
1.1
3.1
1.5
3.1
1.1
1.1
0.4
8.5
4.5
3.1
5.4
93
94
43
80
74
1
±
Max
340
150
150
6.8
200
Units
µmho
MHz
V/µs
kHz
mA
mA
nA
dB
nA
µA
µA
ns
ns
%
%
Ω
Ω
Ω
Ω
A
V
V