Microchip LX7180A Bruksanvisning
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June 2015 Rev. 1.2 www.microsemi.com1
© 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 Stepdown Regulator
Operational Input Supply Voltage Range:
3.0 V5.5 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 Rperation
Input Under Voltage and Over Voltage Protection
Enable and Power Good Function
I2C Serial Interface at 3.4 Mbps
S- Internal oftstart
C--yclebyCycle 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), bidirectional 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
Produktspecifikationer
| Varumärke: | Microchip |
| Kategori: | Inte kategoriserad |
| Modell: | LX7180A |
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