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LM3150 PDF даташит

Спецификация LM3150 изготовлена ​​​​«National Semiconductor» и имеет функцию, называемую «SIMPLE SWITCHER CONTROLLER».

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Номер произв LM3150
Описание SIMPLE SWITCHER CONTROLLER
Производители National Semiconductor
логотип National Semiconductor логотип 

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LM3150 Даташит, Описание, Даташиты
www.DataSheet.co.kr
October 17, 2008
LM3150
SIMPLE SWITCHER® CONTROLLER, 42V Synchronous
Step-Down
General Description
The LM3150 SIMPLE SWITCHER® Controller is an easy to
use and simplified step down power controller capable of pro-
viding up to 12A of output current in a typical application.
Operating with an input voltage range of 6V-42V, the LM3150
features an adjustable output voltage down to 0.6V. The
switching frequency is adjustable up to 1 MHz and the syn-
chronous architecture provides for highly efficient designs.
The LM3150 controller employs a Constant On-Time (COT)
architecture with a proprietary Emulated Ripple Mode (ERM)
control that allows for the use of low ESR output capacitors,
which reduces overall solution size and output voltage ripple.
The Constant On-Time (COT) regulation architecture allows
for fast transient response and requires no loop compensa-
tion, which reduces external component count and reduces
design complexity.
Fault protection features such as thermal shutdown, under-
voltage lockout, over-voltage protection, short-circuit protec-
tion, current limit, and output voltage pre-bias startup allow for
a reliable and robust solution.
The LM3150 SIMPLE SWITCHER® concept provides for an
easy to use complete design using a minimum number of ex-
ternal components and National’s WEBENCH® online design
tool. WEBENCH® provides design support for every step of
the design process and includes features such as external
component calculation with a new MOSFET selector, electri-
cal simulation, thermal simulation, and Build-It boards for
prototyping.
Features
PowerWise® step-down controller
6V to 42V Wide input voltage range
Adjustable output voltage down to 0.6V
Programmable switching frequency up to 1 MHz
No loop compensation required
Fully WEBENCH® enabled
Low external component count
Constant On-Time control
Ultra-fast transient response
Stable with low ESR capacitors
Output voltage pre-bias startup
Valley current limit
Programmable soft-start
Typical Applications
Telecom
Networking Equipment
Routers
Security Surveillance
Power Modules
Typical Application
SIMPLE SWITCHER® is a registered trademark of National Semiconductor Corporation
© 2008 National Semiconductor Corporation 300531
30053101
www.national.com
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LM3150 Даташит, Описание, Даташиты
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Connection Diagram
Ordering Information
Order Number
LM3150MH
LM3150MHE
LM3150MHX
Package Type
eTSSOP-14
eTSSOP-14
30053102
NSC Package Drawing
MXA14A
Supplied As
94 Units per Anti-Static Tube
250 Units in Tape and Reel
2500 Units in Tape and Reel
Pin Descriptions
Pin Name Description
Function
1
VCC
Supply Voltage for FET
Drivers
Nominally regulated to 5.95V. Connect a 1.0 µF to 2.2 µF decoupling capacitor from
this pin to ground.
2
VIN Input Supply Voltage
Supply pin to the device. Nominal input range is 6V to 42V.
3 EN Enable
To enable the IC apply a logic high signal to this pin greater than 1.26V typical or
leave floating. To disable the part, ground the EN pin.
4 FB Feedback
Internally connected to the regulation, over-voltage, and short-circuit comparators.
The regulation setting is 0.6V at this pin. Connect to feedback resistor divider between
the output and ground to set the output voltage.
5,9 SGND Signal Ground
Ground for all internal bias and reference circuitry. Should be connected to PGND at
a single point.
6 SS Soft-Start
An internal 7.7 µA current source charges an external capacitor to provide the soft-
start function.
7 RON On-time Control
An external resistor from VIN to this pin sets the high-side switch on-time.
8 ILIM Current Limit
10 SW Switch Node
Monitors current through the low-side switch and triggers current limit operation if the
inductor valley current exceeds a user defined value that is set by RLIM and the Sense
current, ILIM-TH, sourced out of this pin during operation.
Switch pin of controller and high-gate driver lower supply rail. A boost capacitor is
also connected between this pin and BST pin
11
HG High-Side Gate Drive
Gate drive signal to the high-side NMOS switch. The high-side gate driver voltage is
supplied by the differential voltage between the BST pin and SW pin.
12
BST
Connection for Bootstrap
Capacitor
High-gate driver upper supply rail. Connect a 0.33 µF-0.47 µF capacitor from SW pin
to this pin. An internal diode charges the capacitor during the high-side switch off-
time. Do not connect to an external supply rail.
Gate drive signal to the low-side NMOS switch. The low-side gate driver voltage is
13
LG Low-Side Gate Drive
supplied by VCC.
14 PGND Power Ground
Synchronous rectifier MOSFET source connection. Tie to power ground plane.
Should be tied to SGND at a single point.
EP EP Exposed Pad
Exposed die attach pad should be connected directly to SGND. Also used to help
dissipate heat out of the IC.
www.national.com
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LM3150 Даташит, Описание, Даташиты
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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
BST to SW
BST to GND
-0.3V to 47V
-3V to 47V
-0.3V to 7V
-0.3V to 52V
All Other Inputs to GND
ESD Rating (Note 2)
Storage Temperature Range
-0.3V to 7V
2 kV
-65°C to +150°C
Operating Ratings (Note 1)
VIN
Junction Temperature Range (TJ)
EN
6V to 42V
−40°C to + 125°C
0V to 5V
Electrical Characteristics Limits in standard type are for TJ = 25°C only; 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, design, or statistical
correlation. Typical values represent the most likely parametric norm at TJ = 25°C, and are provided for reference purposes only.
Unless otherwise stated the following conditions apply: VIN = 18V.
Symbol
Parameter
Conditions
Min Typ Max Units
Start-Up Regulator, VCC
VCC
VIN - VCC
IVCCL
VCCUVLO
VIN - VCC Dropout Voltage
VCC Current Limit (Note 3)
VCC Under-Voltage Lockout Threshold
(UVLO)
CVCC = 1 µF, 0 mA to 40 mA
IVCC = 2 mA, VIN = 5.5V
IVCC = 30 mA, VIN = 5.5V
VCC = 0V
VCC Increasing
5.65
65
4.75
5.95
40
330
100
5.1
6.25 V
mV
mA
5.40 V
VCCUVLO-HYS
tCC-UVLO-D
IIN
IIN-SD
VCC UVLO Hysteresis
VCC UVLO Filter Delay
Input Operating Current
Input Operating Current, Device
Shutdown
VCC Decreasing
No Switching, VFB = 1V
VEN = 0V
475 mV
3 µs
3.5 5 mA
32 55 µA
GATE Drive
IQ-BST
RDS-HG-Pull-Up
RDS-HG-Pull-Down
RDS-LG-Pull-Up
RDS-LG-Pull-Down
Soft-Start
Boost Pin Leakage
HG Drive Pull–Up On-Resistance
HG Drive Pull–Down On-Resistance
LG Drive Pull–Up On-Resistance
LG Drive Pull–Down On-Resistance
VBST – VSW = 6V
IHG Source = 200 mA
IHG Sink = 200 mA
ILG Source = 200 mA
ILG Sink = 200 mA
2 nA
5
3.4
3.4
2
ISS
ISS-DIS
Current Limit
SS Pin Source Current
SS Pin Discharge Current
VSS = 0V
5.9 7.7 9.5 µA
200 µA
ILIM-TH
ON/OFF Timer
Current Limit Sense Pin Source Current
75 85 95 µA
tON ON Timer Pulse Width
tON-MIN
tOFF
Enable Input
ON Timer Minimum Pulse Width
OFF Timer Minimum Pulse Width
VIN = 10V, RON = 100 kΩ,
VFB = 0.6V
VIN = 18V, RON = 100 kΩ,
VFB = 0.6V
VIN = 42V, RON = 100 kΩ,
VFB = 0.6V
(Note 4)
1.02
0.62 µs
0.36
200 ns
370 525 ns
VEN
VEN-HYS
EN Pin Input Threshold Trip Point
EN Pin Threshold Hysteresis
VEN Rising
VEN Falling
1.14 1.20 1.26 V
120 mV
3 www.national.com
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