LM5050MK-1/NOPB National Semiconductor, LM5050MK-1/NOPB Datasheet

Single Act OR-ing/ideal Cntrl

LM5050MK-1/NOPB

Manufacturer Part Number
LM5050MK-1/NOPB
Description
Single Act OR-ing/ideal Cntrl
Manufacturer
National Semiconductor
Datasheet

Specifications of LM5050MK-1/NOPB

Digital Ic Case Style
TSOT
No. Of Pins
6
Peak Reflow Compatible (260 C)
Yes
Leaded Process Compatible
Yes
Rohs Compliant
Yes
Ic Function
Control IC
Supply Voltage Range
5V To 75V
Operating Temperature Range
-40°C To +125°C

Available stocks

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Manufacturer
Quantity
Price
Part Number:
LM5050MK-1/NOPB
Manufacturer:
TI
Quantity:
2 000
Part Number:
LM5050MK-1/NOPB
Manufacturer:
TI/德州仪器
Quantity:
20 000
Part Number:
LM5050MK-1/NOPB
0
© 2011 National Semiconductor Corporation
High Side OR-ing FET Controller
General Description
The LM5050-1 High Side OR-ing FET Controller operates in
conjunction with an external MOSFET as an ideal diode rec-
tifier when connected in series with a power source. This
ORing controller allows MOSFETs to replace diode rectifiers
in power distribution networks thus reducing both power loss
and voltage drops.
The LM5050-1 controller provides charge pump gate drive for
an external N-Channel MOSFET and a fast response com-
parator to turn off the FET when current flows in the reverse
direction. The LM5050-1 can connect power supplies ranging
from +5V to +75V and can withstand transients up to +100V.
Typical Application Circuits
FIGURE 2. Typical Redundant Supply Configuration
301048
FIGURE 1. Full Application
LM5050-1
Features
Applications
Wide Operating Input Voltage range, V
+100 Volt transient capability
Charge pump gate driver for external N-Channel MOSFET
Fast 50ns response to current reversal
2A peak gate turn-off current
Minimum V
Package: TSOT-6 (Thin SOT23-6)
Active OR-ing of Redundant (N+1) Power Supplies
DS
clamp for faster turn-off
30104833
30104804
IN
: 5V to 75V
www.national.com
May 3, 2011

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LM5050MK-1/NOPB Summary of contents

Page 1

... FET when current flows in the reverse direction. The LM5050-1 can connect power supplies ranging from +5V to +75V and can withstand transients up to +100V. Typical Application Circuits FIGURE 2. Typical Redundant Supply Configuration © 2011 National Semiconductor Corporation LM5050-1 Features ■ Wide Operating Input Voltage range, V ■ ...

Page 2

... LM5050MKX-1 Pin Descriptions Pin # www.national.com Top View 30104806 LM5050MK-1 TSOT-6 Package NS Package Number MK06A Package Type TSOT-6 TSOT-6 Name The main supply pin for all internal biasing and an auxiliary supply for the internal gate drive charge pump. Typically connected to VS either separate supply can also be used ...

Page 3

Absolute Maximum Ratings IN, OUT Pins to Ground (Note 4) GATE Pin to Ground (Note 4) VS Pin to Ground OFF Pin to Ground Storage Temperature Range Electrical Characteristics operating junction temperature (T ) range of -40°C to +125°C. Minimum ...

Page 4

Symbol Parameter Gate Capacitance Discharge Time at t Forward to Reverse Transition GATE(REV) See Figure 3 Gate Capacitance DischargeTime at t OFF pin Low to High Transition GATE(OFF) See Figure 4 I Gate Pin Sink Current GATE(OFF) Reverse V Threshold ...

Page 5

FIGURE 3. Gate Off Timing for Forward to Reverse Transition FIGURE 4. Gate Off Timing for OFF pin Low to High Transition 5 30104825 30104826 www.national.com ...

Page 6

Typical Performance Characteristics Unless otherwise stated 12V OUT OUT www.national.com = 12V 0.0V, and T = 25°C IN OFF J 30104834 ...

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GATE OUT Forward C Charge Time GATE GATE 26 Vin Vout 24 Vgate ...

Page 8

OFF Pin Thresholds vs Temperature C Charge and Discharge vs OFF Pin GATE OFF Pin, Off to On Transition www.national.com OFF Pin Pull-Down vs Temperature 30104827 OFF Pin Off Transition 30104815 GATE Pin vs (R 30104817 8 30104828 ...

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Block Diagram 9 30104822 www.national.com ...

Page 10

Applications Information FUNCTIONAL DESCRIPTION Systems that require high availability often use multiple, par- allel-connected redundant power supplies to improve reliabil- ity. Schottky OR-ing diodes are typically used to connect these redundant power supplies to a common point at the load. ...

Page 11

The OFF pin has an internal pull-down of 5 µA (typical). If the OFF function is not required the pin may be left open or con- nected to ground. FIGURE 7. SHORT CIRCUIT FAILURE OF AN INPUT SUPPLY An abrupt ...

Page 12

R increases as the junction temperature increases DISS D DS(ON) Operating with a maximum ambient temperature (T 35°C, a load current of 10A, and an R desiring to keep ...

Page 13

FIGURE 11. Typical Application with Input and Output Transient Protection FIGURE 12. +48V Application with Reverse Input Voltage (V = -48V) Protection IN 13 30104843 30104844 www.national.com ...

Page 14

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted 6-Lead TSOT Package NS Package Number MK06A 14 ...

Page 15

Notes 15 www.national.com ...

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