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부품번호 LM3100 기능
기능 Voltage Regulator
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LM3100 데이터시트, 핀배열, 회로
www.DataSheet4U.com
February 2006
LM3100
SIMPLE SWITCHER® Synchronous 1MHz 1.5A
Step-Down Voltage Regulator
General Description
The LM3100 Synchronously Rectified Buck Converter fea-
tures all functions needed to implement a highly efficient,
cost effective buck regulator capable of supplying 1.5A to
loads with voltages as low as 0.8V. Dual 40V N-Channel
synchronous MOSFET switches allow for low external com-
ponent thus reducing complexity and minimizing board
space. The LM3100 is designed to work exceptionally well
with ceramic and other very low ESR output capacitors. The
Constant ON-Time (COT) regulation scheme requires no
loop compensation, results in fast load transient response,
and simplifies circuit implementation. Through the use of a
unique design the regulator does not rely on output capacitor
ESR for stability, as do most other COT regulators. The
operating frequency remains nearly constant with line and
load variations due to the inverse relationship between the
input voltage and the on-time. The oprating frequency can
be externally programmed up to 1MHz. Protection features
include VCC under-voltage lockout, thermal shutdown and
gate drive under-voltage lockout. The part is available in a
thermally enhanced eTSSOP-20 package
Features
n Input voltage range 4.5V - 36V
n 1.5A output current
n 0.8V, ±1.5% reference
n Integrated 40V, dual N-Channel buck synchronous
switches
n Low component count and small solution size
n No loop compensation required
n Ultra-fast transient response
n Stable with ceramic and other low ESR capacitors
n Programmable switching frequency up to 1MHz
n Max. duty cycle limited during start-up
n Valley current limit
n Precision Internal Reference for adjustable output
voltage down to 0.8V
n Thermal shutdown
n Thermally enhanced eTSSOP-20 package
Typical Applications
n 5VDC, 12VDC, 24VDC, 12VAC, and 24VAC systems
n Embedded Systems
n Industrial Controls
n Automotive Telematics and Body Electronics
n Point of Load Regulators
n Storage Systems
n Broadband Infrastructure
n Direct Conversion from 2/3/4 Cell Lithium Batteries
Systems
Typical Application
SIMPLE SWITCHER® is a registered trademark of National Semiconductor Corporation
© 2006 National Semiconductor Corporation DS201747
DataSheet4 U .com
20174702
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LM3100 pdf, 반도체, 판매, 대치품
www.DataSheet4U.com
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
VIN, RON to GND
SW to GND
SW to GND (Transient)
VIN to SW
BST to SW
All Other Inputs to GND
-0.3V to 40V
-0.3V to 40V
-2V (< 100ns)
-0.3V to 40V
-0.3V to 7V
-0.3V to 7V
ESD Rating (Note 2)
Human Body Model
Storage Temperature Range
Junction Temperature (TJ)
±2kV
-65˚C to +150˚C
150˚C
Operating Ratings (Note 1)
Supply Voltage Range (VIN)
Junction Temperature Range (TJ)
Thermal Resistance (θJC) (Note 3)
4.5V to 36V
−40˚C to + 125˚C
6.5˚C/W
Electrical Charateristics Specifications with standard type are for TJ = 25˚C only; limits in boldface type ap-
ply over the full Operating Junction Temperature (TJ) range. Minimum and Maximum limits are guaranteed through test, de-
sign, or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25˚C, and are provided for ref-
erence purposes only. Unless otherwise stated the following conditions apply: VIN = 18V, VOUT = 3.3V.
Symbol
Parameter
Conditions
Start-Up Regulator, VCC
VCC VCC output voltage
VIN - VCC
VIN - VCC dropout voltage
IVCCL
VCC-UVLO
VCC current limit (Note 4)
VCC under-voltage lockout threshold
(UVLO)
CCC = 680nF, no load
ICC = 2mA
ICC = 20mA
VCC = 0V
VIN increasing
VCC-UVLO-HYS VCC UVLO hysteresis
tVCC-UVLO-D
VCC UVLO filter delay
IIN IIN operating current
IIN-SD
IIN operating current, Device shutdown
Switching Characteristics
VIN decreasing
No switching, VFB = 1V
VEN = 0V
RDS-UP-ON
RDS- DN-ON
VG-UVLO
Soft-start
Main MOSFET Rds(on)
Syn. MOSFET Rds(on)
Gate drive voltage UVLO
VBST - VSW increasing
ISS
Current Limit
SS pin source current
VSS = 0.5V
ICL
ON/OFF Timer
Syn. MOSFET current limit threshold
tON
tON-MIN
tOFF
Enable Input
ON timer pulse width
ON timer minimum pulse width
OFF timer pulse width
VIN = 10V, RON = 100 k
VIN = 30V, RON = 100 k
VEN EN Pin input threshold
VEN-HYS
Enable threshold hysteresis
Regulation and Over-Voltage Comparator
VEN rising
VEN falling
VFB In-regulation feedback voltage
VFB-OV
Feedback over-voltage threshold
IFB
Thermal Shutdown
VSS 0.8V
TJ = −40˚C to + 125˚C
VSS 0.8V
TJ = 0˚C to + 125˚C
TSD Thermal shutdown temperature TJ rising
Min
5.0
40
3.6
6
1.236
0.784
0.788
0.894
Typ
6.0
50
350
65
3.75
130
3
0.7
17
0.18
0.11
3.3
8
1.9
1.38
0.47
200
260
1.26
90
0.8
0.920
5
165
Max Units
7.2
140
570
3.85
V
mV
mA
V
mV
µs
1 mA
30 µA
0.35
0.2
4
V
9.8 µA
A
µs
ns
ns
1.285
V
mV
0.816
V
0.812
0.940
100
V
nA
˚C
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LM3100 전자부품, 판매, 대치품
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Typical Performance Characteristics All curves taken at VIN = 18V with configuration in typical
application circuit for VOUT = 3.3V shown in this datasheet. TA = 25˚C, unless otherwise specified. (Continued)
RDS(ON) vs Temperature
Efficiency vs Load Current
(VOUT = 3.3V)
20174724
VOUT Regulation vs Load Current
(VOUT = 3.3V)
20174725
Efficiency vs Load Current
(VOUT = 0.8V)
20174726
VOUT Regulation vs Load Current
(VOUT = 0.8V)
Power Up
(VOUT = 3.3V, 1.5A Loaded)
20174727
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20174728
7
20174729
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