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LM3075 PDF даташит

Спецификация LM3075 изготовлена ​​​​«National Semiconductor» и имеет функцию, называемую «Synchronous Current Mode Buck Controller».

Детали детали

Номер произв LM3075
Описание Synchronous Current Mode Buck Controller
Производители National Semiconductor
логотип National Semiconductor логотип 

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LM3075 Даташит, Описание, Даташиты
September 2005
LM3075
High Efficiency, Synchronous Current Mode Buck
Controller
General Description
The LM3075 is a current mode control, synchronous buck
controller IC. Use of synchronous rectification and pulse-
skipping operation at light load achieves high efficiency over
a wide load range. Fixed frequency operation can be ob-
tained by disabling the pulse-skipping mode. Current mode
control assures excellent line and load regulation and a wide
loop bandwidth for fast response to load transients.
www.DataSChuereretn4Ut .mcoomde control can be achieved by either sensing
across the high side NFET or a sense resistor. The switching
frequency can be selected as either 200 kHz or 300 kHz
from an internal clock.
The LM3075 is available with an adjustable output in a
TSSOP-20 package.
Features
n Input voltage range of 4.5V-36V
n Current Mode Control
n Skip mode operation available
n Cycle by cycle current limit
n 1.24V ±2% Reference
Applications
n Automotive Power Supplies
n Distributed Power Systems
Typical Application Circuit
© 2005 National Semiconductor Corporation DS201623
20162301
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LM3075 Даташит, Описание, Даташиты
Connection Diagram
TOP VIEW
20162302
20-Lead TSSOP (MTC)
Ordering Information
Order Number
LM3075MTC
www.DataSheet4U.coLmM3075MTCX
Package Type
TSSOP-20
TSSOP-20
Pin Descriptions
LM3075 Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Name
VLIN5
VIN
EXT
FS
EN
FB
FPWM
COMP
SS
AGND
PGND
LDRV
VDD
CBOOT
HDRV
SW
CSL
CSH
ILIM
PGOOD
NSC Package Drawing
MTC-20
MTC-20
Supplied As
73 Units per Anti-Static Tube
2500 Units on Tape and Reel
Function
5V linear regulator output
Input voltage supply
External power connection for VLIN5
Frequency select
Enable pin
Feedback pin
Forced PWM selection
Compensation pin
Output enable / soft-start pin
Analog ground
Power ground
Low side gate drive
Low side gate drive supply
Bootstrap capacitor connection
High side gate drive
Switch node
Current sense low
Current sense high
Current limit threshold adjustment
Power good flag
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LM3075 Даташит, Описание, Даташиты
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 GND:
VIN, ILIM, CSH
−0.3V to 38V
SW, CSL
PGOOD, FB, VDD, EXT, EN
−0.3 to (VIN + 0.3V)
−0.3V to +7V
COMP, SS, FPWM, FS
−0.3V to (VLIN5
+0.3)V
CBOOT
-0.3V to +43V
CBOOT to SW
−0.3V to 7V
LDRV
−0.3V to (VDD+0.3V)
HDRV to SW
HDRV to CBOOT
Storage Temperature Range
Junction Temperature
Lead Temperature (Soldering, 10
sec)
ESD Rating (Note 2)
−0.3V
+0.3V
−65˚C to +150˚C
150˚C
260˚C
1.5kV
Operating Ratings(Note 1)
Junction Temperature
VIN to GND
EXT
−40˚C to +125˚C
4.5V to 36V
6V Max
Electrical Characteristics Limits in standard type are for TJ = 25˚C only, and limits in boldface type apply
over the junction temperature TJ range of -40˚C to +125˚C. Minimum and Maximum limits are guaranteed through test, de-
www.sDiganta, oShr esetatt4isUt.iccaolmcorrelation. Typical values represent the most likely parametric norm at TJ = 25˚C, and are provided for ref-
erence purposes only. Unless otherwise specified VIN = 12V.
Symbol
VFB
Parameter
Feedback pin voltage
Load Regulation
Conditions
VIN = 4.5V to 36V
VCOMP = 0.5V to 1.5V
Min
1.213
Typ
1.238
0.04
Max
1.259
Unit
V
%
Line Regulation
VIN = 4.5V to 36V
0.04
%
IQ
ISD
VLIN5
VUVLO
VUVLO_HYS
VCL_OS
IILIM
ISS_SRC
ISS_SNK
VSS_TO
VOVP
VOVP_HYS
POWERGOOD
VPWR_GOOD
VPWR_BAD
TPGOOD
IOL
IOH
GATE DRIVE
Operating Quiescent current VIN = 4.5V to 36V
Shutdown Quiescent current VEN = 0V
VLIN5 Output Voltage
IVLIN5 = 0 to 25mA
VIN = 5.5V to 36V
VLIN5 Under Voltage
Lockout
VLIN5 Under Voltage
Lockout Hysteresis
Current Limit Comparator
Offset
(VILIM – VCSL)
ILIM sink current
Soft-Start Pin Source
Current
VSS = 1.2V
Soft-Start Pin Sink Current VSS = 2V
Soft-Start Timeout
Threshold
Over Voltage Protection
Rising Threshold
With respect to VFB
Over Voltage Protection
Hysteresis
With respect to VFB
PGOOD Rising Threshold
PGOOD Falling Threshold
PGOOD delay
PGOOD Low Sink Current
PGOOD High Leakage
Current
PGOOD pin de-asserting
VPGOOD = 0.4V
VPGOOD = 5V
1.0 2 mA
60 100 µA
V
4.7 5 5.3
3.7 3.9 4.1
V
0.2 V
±0.2
mV
8.3 10 11.3 µA
1 2 3 µA
4 µA
2V
105 111 117
%
2.8 %
92.5
87
0.6
95.5
90.5
10
1
5
98.5
95
200
%
%
µs
mA
nA
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