參數(shù)資料
型號： LM2645MTDX/NOPB
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 335 kHz SWITCHING FREQ-MAX, PDSO48
封裝： TSSOP-48
文件頁數(shù)： 19/20頁
文件大?。?/td> 497K
代理商： LM2645MTDX/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,
1.56W
Junction Temperature (T
J)
+150C
Ambient Storage Temperature
Range
65C to +150C
Soldering Dwell Time, Temperature
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 ap-
ply 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 statisti-
cal 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, Vcompx =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, VOUT1 = 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
IVLIN5 = 0 to 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
2V
LM2645
www.national.com
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