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LM3153 PDF даташит

Спецификация LM3153 изготовлена ​​​​«National Semiconductor» и имеет функцию, называемую «(LM3151 - LM3153) SIMPLE SWITCHER CONTROLLER».

Детали детали

Номер произв LM3153
Описание (LM3151 - LM3153) SIMPLE SWITCHER CONTROLLER
Производители National Semiconductor
логотип National Semiconductor логотип 

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LM3153 Даташит, Описание, Даташиты
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LM3151/LM3152/LM3153
August 26, 2009
SIMPLE SWITCHER® CONTROLLER, High Input Voltage
Synchronous Step-Down
General Description
The LM3151/2/3 SIMPLE SWITCHER® Controller is an easy
to use and simplified step down power controller capable of
providing up to 12A of output current in a typical application.
Operating with an input voltage range from 6V-42V, the
LM3151/2/3 features a fixed output voltage of 3.3V, and fea-
tures switching frequencies of 250 kHz, 500 kHz, and 750
kHz. The synchronous architecture provides for highly effi-
cient designs. The LM3151/2/3 controller employs a Constant
On-Time (COT) architecture with a proprietary Emulated Rip-
ple 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) regula-
tion architecture allows for fast transient response and re-
quires no loop compensation, which reduces external com-
ponent 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 LM3151/2/3 SIMPLE SWITCHER® concept provides for
an easy to use complete design using a minimum number of
external components and National’s WEBENCH® online de-
sign 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
Fixed output voltage of 3.3V
Fixed switching frequencies of 250 kHz/500 kHz/750 kHz
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
© 2009 National Semiconductor Corporation 300532
30053201
www.national.com
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LM3153 Даташит, Описание, Даташиты
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Connection Diagram
Ordering Information
Order Number Package Type
LM3151MH-3.3
LM3151MHE-3.3
LM3151MHX-3.3
eTSSOP-14
LM3152MH-3.3
LM3152MHE-3.3
LM3152MHX-3.3
eTSSOP-14
LM3153MH-3.3
LM3153MHE-3.3
LM3153MHX-3.3
eTSSOP-14
eTSSOP-14
30053202
NSC Package
Drawing
MXA14A
MXA14A
MXA14A
Input
Voltage
Range
6V - 42V
6V - 33V
8V - 18V
Output
Voltage
3.3V
3.3V
3.3V
Switching
Frequency
250KHz
500KHz
750KHz
Supplied As
94 Units per Anti-Static
Tube
250 Units in Tape and
Reel
2500 Units in Tape and
Reel
94 Units per Anti-Static
Tube
250 Units in Tape and
Reel
2500 Units in Tape and
Reel
94 Units per Anti-Static
Tube
250 Units in Tape and
Reel
2500 Units in Tape and
Reel
www.national.com
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Pin Descriptions
Pin Name
Description Function
1
VCC
Supply Voltage for Nominally regulated to 5.95V. Connect a 1 µF to 2.2 µF decoupling capacitor from this
FET Drivers pin to ground.
2
VIN
Input Supply Voltage
Supply pin to the device. Nominal input range is 6V to 42V. See ordering information
for Vin limitations.
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 resistor divider network which sets the fixed output voltage.
This pin also senses the output voltage faults such a over-voltage and short circuit
conditions.
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.
7,8
N/C
Not Connected
Internally not electrically connected. These pins may be left unconnected or connected
to ground.
10 SW
Switch Node
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 Gate drive signal to the high-side NMOS switch. The high-side gate driver voltage is
Drive
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.
13
LG
Low-Side Gate Drive
Gate drive signal to the low-side NMOS switch. The low-side gate driver voltage is
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.
3 www.national.com
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