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参数资料
型号： LM2645MTD/NOPB
厂商： NATIONAL SEMICONDUCTOR CORP
元件分类： 稳压器
英文描述： SWITCHING CONTROLLER, 335 kHz SWITCHING FREQ-MAX, PDSO48
封装： TSSOP-48
文件页数： 19/20页
文件大小： 911K
代理商： LM2645MTD/NOPB
Absolute Maximum Ratings (Note 1)
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,
LDODRV
0.3V to 31V
SW1, SW2, RSNS1, RSNS2
0.3 to (V
IN +
0.3)V
VO1, VO2, FB1_FIX, FB2_FIX,
VDD1, VDD2, EXT
0.3V to 6V
SD, ON1, SS1, ON2, SS2, LDOFB,
F
SEL, UV_DELAY, PGOOD1, OUT3,
PGOOD2, COMP1, COMP2,
FPWM/2NDFB
0.3V to (VLIN5
+0.3)V
CBOOT
1 to SW1, CBOOT2 to SW2
0.3V to 7V
LDRV1, LDRV2
0.3V to
(VDD+0.3)V
HDRV1 to SW1, HDRV2 to SW2
0.3V
HDRV1 to CBOOT1, HDRV2 to
CBOOT2
+0.3V
Power Dissipation (T
A = 25C,
(Note 2)
1.56W
Junction Temperature (T
J)
(Note 2)
+150C
Ambient Storage Temperature
Range
65C to +150C
Soldering Dwell Time, Temperature
(Note 3)
Wave
Infrared
Vapor Phase
4 sec, 260C
10sec, 240C
75sec, 219C
ESD Rating (Note 4)
2kV
Operating Ratings(Note 1)
VIN (VIN and VLIN5 separate)
5.5V to 30V
VIN (VLIN5 tied to VIN)
4.5V to 5.5V
Junction Temperature
0C to +125C
EXT
5.5V max.
Electrical Characteristics
Unless otherwise specified, V
IN = 15V, SGND = PGND = 0V, VLIN5 = VDD1 = VDD2. Limits appearing in boldface type apply
over the entire operating junction temperature range, 0C to +125C. Specifications appearing in plain type are measured using
low duty cycle pulse testing with T
A = 25C (Note 5), (Note 6). Min/Max limits are guaranteed by design, test, or statistical
analysis.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
SYSTEM
V
OUT/VOUT
Load Regulation
V
IN =15V, Vcompx = 0.5V to 1.5V
0.04
%
V
OUT/VOUT
Line Regulation
5.5V
≤ V
IN
≤ 30V, V
compx =1.25V
0.04
%
V
FBX_FIX
Feedback Voltage in
Adjustable Mode
5.5V
≤ VIN ≤ 30V
1.217
1.238
1.259
V
OUT
V
OUTx accuracy at fixed
output mode
5.5V
≤ V
IN
≤ 30V, V
OUT1 = 5V, VOUT2
= 3.3V
2.4
+2.4
%
I
VIN
Input Supply Current
ON1 = ON2 = 5V and
5.5V
≤ V
IN
≤ 30V
1.5
2.8
mA
ON1 = ON2 = 5V and
4.5V
≤ V
IN = VLIN5
≤ 5.5V
1.3
2.8
mA
Standby (Note 7)
ON1 = ON2 = 0V, V
SD =5V
50
120
A
Shutdown V
SD =0V
5
30
A
VLIN5
VLIN5 Output
Voltage(Note 8)
IVLIN5=0to 25mA, EXT = 0V,
5.5V
≤ VIN ≤ 30V, SD = 5V
4.65
5
5.35
V
CLos
Current Limit
Comparator Offset
(VILIMX VRSNSX)
VKS1VILIM1 = VKS2-VILIM2
=140mV
±2mV
I
CL
Current Limit Sink
Current
8
10
12
A
I
ss_SC
Soft-Start Source
Current
V
ss1 =Vss2 =1V
0.5
2
3.5
A
I
ss_SK
Soft-Start Sink Current
V
ss1 =Vss2 =1V
24
A
V
ssto
Soft-Start Timeout
Threshold
(Note 9)
2V
LM2645
www.national.com
8
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