Microchip LX7180A Bedienungsanleitung


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June 2015 Rev. 1.2 www.microsemi.com 1
© 2015 Microsemi Corporation
4A Step Down Regulator-
VIN
GND
10 µF
X5R
500 k
PGOOD
PVIN
EN
PG
PGND AGND
SDA
FB
SW
SW
0.47 µH
22 µF,
X5R
VOUT
GND
1, 10
8
9
2, 11
7
6
4
3, 12
LX7180A
SCL 5
10 µF
X5R
Figure 1 · Typical Application of LX7180A
Features
0- -4 A Step down Regulator
Operational Input Supply Voltage Range:
3.0 V 5.5 V (short durations to 6.5 V) -
Hysteretic Control Offers Best Transient Response
PWM Switching at a Constant 1.65 MHz
Power Save Mode (PSM) can be Selected to
Improve Light Load Efficiency.
O100% atio Duty R peration
Input Under Voltage and Over Voltage Protection
Enable and Power Good Function
I2C Serial Interface at 3.4 Mbps
S - Internal oft start
C - -ycle by Cycle Over Current Protection
Hiccup Mode Protects Against Short Circuit Faults
Seven Bit Adjustable Reference Voltage via I2 C Bus
RoHS Compliant
Applications
High Performance HDD
LCD TV
Notebook/Netbook
Server and Workstations
Video Cards
PoE Powered Devices Smart Phone
Description
The LX7180A is a 4A step-
down regulator with
integrated MOSFETs packaged in a space saving
QFN12 2 mm x 2 mm for today’s mobile devices. It uses
an ultra-
fast, constant frequency hysteretic control
method to minimize external filter components while
maintaining excellent regulation. The LX7180A reference
voltage is programmable from 0.6 V to 1.195 V through a
high speed (up to 3.4 MHz), bi directional I- 2C bus.
The LX7180 operates from 3 V to 5.5 V rails and outputs
0.6 V to 100% of the input voltage.
Cycle-by-cycle current limiting protects against over-
current conditions. Hiccup mode provides protection for
heavy over-load or short-
circuit faults. Thermal
protection shuts down the regulator under over-
temperature
conditions. Over voltage conditions will
immediately shut off the output to protect against
permanent damage. The LX7180A automatically restarts
when all fault conditions are cleared.
LX7180A
4 -A Step Down Regulator
2
Pin Configuration and Pinout
Figure 2 · Pinout Top View
Marking: x” is the 2LSB bits of the binary I2C slave Address
“1” is for the set output voltage
YWWL = Year/Week/Lot Code
RoHS / Pb-free Matte Tin Pin Finish
Ordering Information
Note: 1. I2C* Consult factory for other slave address and set output voltage options.
2. I2C“x” is the 2 LSB bits of the binary slave address (0 to 3).
3. “y” is the set output voltage (0 is 0.6 V, 2 is 0.95 V, 3 is 0.97 V, 1 is 0.9 . V)
Ambient
Temperature Type Package
Slave
Address
Set
Output
Voltage
Part Number Packaging
Type
0 °C °C to 85
RoHS
Compliant,
Pb-free
QFN 2X2 mm
12L
0
1
2
3
0.9 V LX7180A 01CLQ-
LX7180A 11CLQ -
LX7180A 21CLQ -
LX7180A 31CLQ -
LX7180A - xyCLQ*
Bulk
0
1
2
3
0.9 V LX7180A 01CLQ - - TR
LX7180A 11CLQ - - TR
LX7180A 21CLQ - - TR
LX7180A 31CLQ - - TR
LX7180A - - xyCLQ TR*
Tape and Reel
Pin Description
3
Pin Description
Pin Number
Description
1, 10
Supply Voltage. Bypass PVIN to ground plane as close as possible to the IC.
2, 11
Switch Output. Drives the external L-C filter.
3, 12
Power Ground. Connect to ground plane.
4
Analog Ground. Connect to ground plane.
5 SCL I2C Serial Clock Digital Input.
6 SDA I2C Serial Data. Digital Input/Output.
7 FB Feedback – Analog input, monitors the output voltage either directly or
through a resistor divider.
8
Enable – Digital input. Force high to enable the IC.
9 PG Power Good Open drain digital output. Pulls low to indicate a fault
condition. Requires an external pull up resistor.
Block Diagram
Figure 3 · Block Diagram of LX7180A


Produktspezifikationen

Marke: Microchip
Kategorie: Nicht kategorisiert
Modell: LX7180A

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