LM2640MTC-ADJ National Semiconductor, LM2640MTC-ADJ Datasheet - Page 6

• Manufacturer Part Number: LM2640MTC-ADJ
• Description: Dual Adjustable Step-Down Switching Power Supply Controller
• Manufacturer: National Semiconductor

www.national.com
System
Gate Drive
V
Oscillator
F
Error Amplifier
I
FB1
Typicals and limits appearing in regular type apply for T
tion temperature range for operation, 0 to +125˚C. Unless otherwise specified under the Parameter or Conditions columns, V
= 10V, and V
OSC
BOOT
Electrical Characteristics
, I
Symbol
FB2
SD
= V
V
Shutdown Latch Threshold
V
Latch Threshold
Secondary Feedback
Threshold Voltage
(2NDFB/FPWM)
(2NDFB/FPWM) Pin
Pull-Up Current
(2NDFB/FPWM) Pin
Input Leakage Current
Bootstrap Voltage (Voltage
from CBOOT1 to SW1 and
from CBOOT2 to SW2)
HDRV1 and HDRV2 Sink
and Source Current
LDRV1 and LDRV2 Sink and
Source Current
HDRV1 and HDRV2
High-Side On-Resistance
HDRV1 and HDRV2
Low-Side On-Resistance
LDRV1 and LDRV2
High-Side On-Resistance
LDRV1 and LDRV2 Low-Side
On-Resistance
Oscillator Frequency
Minimum OFF-Time
Maximum Frequency of
Synchronization
Minimum Width of
Synchronization Pulses
Feedback Input Bias Current
OUT
OUT
ON/OFF1
Undervoltage
Overvoltage Shutdown
Parameter
= V
ON/OFF2
= 5V. (Note 2), (Note 6) and (Note 7)
(Continued)
V
V
V
V
V
V
CBOOT1 and CBOOT2 Source
1 µA Each
V
= V
V
= V
V
V
−40˚C
V
SYNC Pulses are Low-Going
V
V
−40˚C
SD
ON/OFF1
ON/OFF2
SD
ON/OFF1
ON/OFF2
CBOOT1
CBOOT1
LIN
LIN
FB1
FB1
FB1
SW2
SW2
= 2.4V
= 2.4V
= 5V
= 5V
= 1V, Measured at HDRV1
= V
= V
J
= 25˚C. Limits appearing in boldface type apply over the entire junc-
= 0V
= 0V
T
T
FB2
FB2
= V
= V
= 0V
= 2.4V
= 0V
= 2.4V
J
J
Conditions
CBOOT2
CBOOT2
= 1.4V
= 1.4V
6
+125˚C
+125˚C
= 5V, V
= 5V, V
SW1
SW1
Typical
±
0.35
0.35
150
200
200
250
100
100
2.5
4.5
70
40
0.1
6
4
8
4
Limit
135
165
170
230
160
230
350
400
200
250
360
2.4
2.6
4.3
60
80
80
kHz(max)
kHz(max)
kHz(min)
kHz(min)
kHz(min)
µA(max)
nA(max)
nA(max)
ns(max)
%(max)
%(max)
V(max)
ns(min)
%(min)
%(min)
V(min)
V(min)
Units
kHz
µA
nA
ns
%
%
V
V
A
A
IN