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LM3100 PDF даташит
| Спецификация LM3100 изготовлена «National Semiconductor» и имеет функцию, называемую «Voltage Regulator». |
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Детали детали
| Номер произв | LM3100 |
| Описание | Voltage Regulator |
| Производители | National Semiconductor |
| логотип |  |
15 Pages
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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
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20174702
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Connection Diagram
Ordering Information
Order Number
LM3100MH
LM3100MHX
Package Type
Exposed Pad
TSSOP-20
20174703
20-lead Plastic
eTSSOP (MXA20A)
NSC Package Drawing
MXA0020
Supplied As
73 units per Anti-Static Tube
2500 Units on Tape and Reel
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Pin Descriptions
Pin
1,9,10,12,19,20
2, 3
Name
N/C
SW
4, 5 VIN
6 BST
7 GND
8 SS
11 TST
13 FB
14 EN
15 RON
16 VCC
17, 18
DAP
PGND
EP
Description
No Connection
Switching Node
Input supply voltage
Connection for bootstrap capacitor
Analog Ground
Soft-start
Test mode enable pin
Feedback
Enable pin
On-time Control
Start-up regulator Output
Power Ground
Exposed Pad
Application Information
These pins must be left unconnected.
Internally connected to the buck switch source.
Connect to output inductor.
Supply pin to the device. Nominal input range is
4.5V to 36V.
Connect a 0.033µF capacitor from SW pin to this
pin. An internal diode charges the capacitor during
the high-side switch off-time.
Ground for all internal circuitry other than the
synchronous switches.
An internal 8µA current source charges an external
capacitor to provide the soft- start function.
Force the device into test mode. Must be connected
to ground for normal operation.
Internally connected to the regulation and
over-voltage comparators. The regulation setting is
0.8V at this pin. Connect to feedback divider.
Connect a voltage higher than 1.26V to enable the
regulator.
An external resistor from VIN to this pin sets the
high-side switch on-time.
Nominally regulated to 6V. Connect a capacitor of
not less than 680nF between VCC and GND for
stable operation.
Synchronous rectifier MOSFET source connection.
Tie to power ground plane.
Thermal connection pad, connect to GND.
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