Microchip LX7220 Manual
Microchip
Ikke kategoriseret
LX7220
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2022 Microchip Technology Inc. and its subsidiaries DS20006704A-page 1
LX7220
Features
• Constant Frequency Hysteretic Control
• Extremely Fast Line/Load Transient Response
• I2C for Output Adjustment (3.4 Mbps)
• 1.2 MHz Switching Frequency
• Extremely Low-RDSON MOSFETs
• Input Voltage Rail 2.7V to 5.5V
• Greater than 6A Output Current
• Default Power Save Mode for Light-Load
Efficiency
• UVLO, OVP, OCP
• -40°C to +85°C Ambient Temperature
• Available in VQFN 2 mm x 3 mm 14-Lead
Package
• RoHS Compliant
Applications
• High Performance HDD
• Solid-State Drive
• Data Center Applications
• Raid/Host Bus Adaptors
• Optical Transceivers
General Description
LX7220 is a digitally-controlled step-down regulator IC
with an integrated 22 mΩ high-side P-channel
MOSFET and a 13 mΩ low-side N-channel MOSFET. It
features Microchip proprietary constant frequency
hysteretic control engine for near-instantaneous
correction to line/load transients. It does not require
high-ESR output capacitors and incorporates
energy-saving PSM (Power Save or Pulse Skip Mode)
at light loads, to extend battery life in mobile
applications.
LX7220 has an I2C serial interface port for output
voltage margining and monitoring if required (it can
also operate in default mode). In addition, it includes
robust fault monitoring functions.
LX7220 will operate from 2.7V to 5.5V and is available
in 0.95V or 0.9V output voltages (no voltage divider is
necessary). The output voltage can also be adjusted
with an input voltage of 5V and external voltage divider
up to 3.3V.
Package Types
VIN VIN
GN D
6 7
SDA 2
GN D 3
SW 4
PG 1
VIN 5
12 VOU T
11 AGND
10 EN
9 SW
8 VIN
AVIN
14
SCL
13
VINVIN
GN D
67
SDA2
GN D
3
SW4
PG1
VIN5
12VOUT
11AGND
10
EN
9SW
8VIN
AVIN
14
SCL
13
LX7220
Top View
14-Lead, VQFN, 2 mm x 3 mm
LX7220
Bottom View
14-Lead, VQFN, 2 mm x 3 mm
2.7V to 5.5V, 6A Constant Frequency Hysteretic
Synchronous Buck Regulator with I2C
LX7220
DS20006704A-page 2
2022 Microchip Technology Inc. and its subsidiaries
Functional Block Diagram
Typical Application Circuit
D3, D4, E3, E4
PGOOD
D1, D2, E1
VIN
SW
AGND
VOUT
SDA
AVIN
OCP
PWM
Logic
Hysteretic engine and
pulse skipping
Bandgap
Reference
Drivers
Switches
Vbias
EN
SCL
GND
A4
B4
B2, B3, C1–C4
A1
A2
A3
B1
E2
I2C Control
and
Registers
Soft
Start
Driver
10
Ω
1
μF
X5R
AVIN
2 x 22
μ
F
100 k
Ω
PGOOD
SCL
SDA
Power Good
VIN
EN
Enable GND
AGND
0.47
μH
4 x 22
μF
X5R
VOUT
SW Vo = 0.95V/6A
VIN = 3V – 5.5V
Connect SDA and SCL to
GND or VIN if unused
5, 6, 7, 8
4, 9
12
11
3, PAD
10
2
13
1
14
LX7220
Proprietary
Hysteretic
Control
I
2
C
Control
Produkt Specifikationer
| Mærke: | Microchip |
| Kategori: | Ikke kategoriseret |
| Model: | LX7220 |
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