LM3100MH/NOPB National Semiconductor, LM3100MH/NOPB Datasheet

IC REG SIMPLE SW 1.5A 20-TSSOP

LM3100MH/NOPB

Manufacturer Part Number
LM3100MH/NOPB
Description
IC REG SIMPLE SW 1.5A 20-TSSOP
Manufacturer
National Semiconductor
Series
PowerWise®, SIMPLE SWITCHER®r
Type
Step-Down (Buck)r
Datasheet

Specifications of LM3100MH/NOPB

Internal Switch(s)
Yes
Synchronous Rectifier
Yes
Number Of Outputs
1
Voltage - Output
0.8 ~ 7 V
Current - Output
1.5A
Frequency - Switching
1MHz
Voltage - Input
4.5 ~ 36 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
20-TSSOP Exposed Pad, 20-eTSSOP, 20-HTSSOP
Dc To Dc Converter Type
Step Down
Pin Count
20
Input Voltage
36V
Output Voltage
0.8 to 7V
Switching Freq
1000KHz
Output Current
1.5A
Efficiency
86%
Package Type
TSSOP EP
Output Type
Adjustable
Switching Regulator
Yes
Mounting
Surface Mount
Input Voltage (min)
4.5V
Operating Temp Range
-40C to 125C
Operating Temperature Classification
Automotive
For Use With
LM3100EVAL - BOARD EVAL LM3100
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-
Lead Free Status / Rohs Status
Compliant
Other names
*LM3100MH
*LM3100MH/NOPB
LM3100MH
© 2009 National Semiconductor Corporation
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 syn-
chronous MOSFET switches allow for low external compo-
nent thus reducing complexity and minimizing board space.
The LM3100 is designed to work exceptionally well with ce-
ramic and other very low ESR output capacitors. The Con-
stant 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 varia-
tions 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 V
der-voltage lockout, thermal shutdown and gate drive under-
voltage lockout. The part is available in a thermally enhanced
eTSSOP-20 package
Typical Application
SIMPLE SWITCHER® is a registered trademark of National Semiconductor Corporation
201747
CC
un-
LM3100
Features
Typical Applications
Input voltage range 4.5V - 36V
1.5A output current
0.8V, ±1.5% reference
Integrated 40V, dual N-Channel buck synchronous
switches
Low component count and small solution size
No loop compensation required
Ultra-fast transient response
Stable with ceramic and other low ESR capacitors
Programmable switching frequency up to 1MHz
Max. duty cycle limited during start-up
Valley current limit
Precision Internal Reference for adjustable output voltage
down to 0.8V
Thermal shutdown
Thermally enhanced eTSSOP-20 package
5VDC, 12VDC, 24VDC, 12VAC, and 24VAC systems
Embedded Systems
Industrial Controls
Automotive Telematics and Body Electronics
Point of Load Regulators
Storage Systems
Broadband Infrastructure
Direct Conversion from 2/3/4 Cell Lithium Batteries
Systems
20174702
December 1, 2009
www.national.com

Related parts for LM3100MH/NOPB

LM3100MH/NOPB Summary of contents

Page 1

... Protection features include V der-voltage lockout, thermal shutdown and gate drive under- voltage lockout. The part is available in a thermally enhanced eTSSOP-20 package Typical Application SIMPLE SWITCHER® registered trademark of National Semiconductor Corporation © 2009 National Semiconductor Corporation LM3100 Features ■ ...

Page 2

Connection Diagram Ordering Information Order Number Package Type LM3100MH Exposed Pad TSSOP-20 LM3100MHX www.national.com 20174703 20-lead Plastic eTSSOP (MXA20A) NSC Package Drawing MXA0020 73 units per Anti-Static Tube 2500 Units on Tape and Reel 2 Supplied As ...

Page 3

Pin Descriptions Pin Name 1,9,10,12,19,20 N VIN 6 BST Connection for bootstrap capacitor 7 GND TST RON 16 VCC 17, 18 PGND DAP EP Description Application Information ...

Page 4

... Absolute Maximum Ratings 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 Electrical Characteristics over the full Operating Junction Temperature (T statistical correlation ...

Page 5

Symbol Parameter Thermal Shutdown T Thermal shutdown temperature SD T Thermal shutdown temperature SD-HYS hysteresis Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the device ...

Page 6

Typical Performance Characteristics All curves taken 18V with configuration in typical application circuit for V IN unless otherwise specified. Quiescent Current www.national.com 20174718 IN 20174720 6 = 3.3V ...

Page 7

Switching Frequency 20174722 R vs Temperature DS(ON) 20174724 V Regulation vs Load Current OUT (V = 3.3V) OUT 20174726 V vs Temperature FB Efficiency vs Load Current (V = 3.3V) OUT Efficiency vs Load Current ...

Page 8

V Regulation vs Load Current OUT (V = 0.8V) OUT Enable Transient (V = 3.3V, 1.5A Loaded) OUT Continuous Mode Operation (V = 3.3V, 1.5A Loaded) OUT www.national.com (V 20174728 (V 20174730 Discontinuous Mode Operation (V OUT 20174732 8 Power ...

Page 9

CCM to DCM Transition (V = 3.3V, 0.15A - 1.5A Load) OUT 20174734 Load Transient (V = 3.3V, 0.15A - 1.5A Load, Current slew-rate: 2.5A/µs) OUT 9 20174735 www.national.com ...

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Simplified Functional Block Diagram www.national.com 10 20174701 ...

Page 11

Functional Description The LM3100 Step Down Switching Regulator features all functions needed to implement a cost effective, efficient buck power converter capable of supplying 1. load. This voltage regulator contains Dual 40V N-Channel buck syn- chronous switches and ...

Page 12

For all cases, this voltage must be limited not to exceed 7V. FIGURE 1. Shutdown Implementation www.national.com Current Limit Current limit detection occurs during the off-time by monitor- ing the re-circulating current through the low-side syn- chronous ...

Page 13

N-Channel Buck Switch and Driver The LM3100 integrates an N-Channel buck (high-side) switch and associated floating high voltage gate driver. The gate drive circuit works in conjunction with an external bootstrap capacitor and an internal high voltage diode ...

Page 14

Inductor Selector for V : The capacitor on the V output provides not only noise C VCC CC filtering and stability, but also prevents false triggering of the V UVLO at the buck switch on/off transitions. For this rea- CC ...

Page 15

Typical Application Schematic for V OUT Typical Application Schematic for V OUT 15 20174716 = 3.3V 20174717 = 0.8V www.national.com ...

Page 16

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted 20-Lead Plastic eTSSOP Package NS Package Number MXA20A 16 ...

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Notes 17 www.national.com ...

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