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| 型號： | LM2640 |
| 文件頁數(shù)： | 6/18頁 |
| 文件大小： | 504K |
| 代理商： | LM2640 |
Electrical Characteristics
(Continued)
Typicals and limits appearing in regular type apply for T
= 25C. Limits appearing in
boldface
type apply over the entire junc-
tion temperature range for operation, 0 to +125C. Unless otherwise specified under the Parameter or Conditions columns, V
IN
= 10V, and V
SD
= V
ON/OFF1
= V
ON/OFF2
= 5V. (Note 2), (Note 6) and (Note 7)
Symbol
Parameter
Conditions
V
OUT
Undervoltage Shutdown
Latch Threshold
Typical
70
Limit
Units
%
%(min)
%(max)
%
%(min)
%(max)
V
V(min)
V(max)
60
80
V
OUT
Overvoltage Shutdown
Latch Threshold
150
135
165
Secondary Feedback
Threshold Voltage
(2NDFB/FPWM)
2.5
2.4
2.6
(2NDFB/FPWM) Pin
Pull-Up Current
V
SD
= 2.4V
V
ON/OFF1
= 0V
V
ON/OFF2
= 2.4V
V
SD
= 2.4V
V
ON/OFF1
= 0V
V
ON/OFF2
= 2.4V
40
80
μA(max)
(2NDFB/FPWM) Pin
Input Leakage Current
±
0.1
μA
Gate Drive
V
BOOT
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
CBOOT1 and CBOOT2 Source
1 μA Each
4.5
V
4.3
V(min)
0.35
A
0.35
A
V
CBOOT1
= V
CBOOT2
= 5V, V
SW1
=
V
SW2
= 0V
V
CBOOT1
= V
CBOOT2
= 5V, V
SW1
=
V
SW2
= 0V
V
LIN
= 5V
6
4
8
V
LIN
= 5V
4
Oscillator
F
OSC
Oscillator Frequency
200
kHz
170
230
160
230
kHz(min)
kHz(max)
kHz(min)
kHz(max)
ns
ns(max)
kHz(min)
40C
≤
T
J
≤
+125C
200
Minimum OFF-Time
V
FB1
= 1V, Measured at HDRV1
250
350
400
Maximum Frequency of
Synchronization
Minimum Width of
Synchronization Pulses
SYNC Pulses are Low-Going
200
ns(min)
Error Amplifier
I
FB1
, I
FB2
Feedback Input Bias Current
V
FB1
= V
FB2
= 1.4V
100
nA
250
nA(max)
V
FB1
= V
FB2
= 1.4V
40C
≤
T
J
≤
+125C
100
360
nA(max)
L
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