LP8720 Datasheet, PDF (1/26 Pages) National Semiconductor (TI) – One Step-Down DC/DC and Five Linear Regulators with I2C Compatible Interface

LP8720
www.ti.com
SNVS575B – JULY 2008 – REVISED MAY 2013
LP8720 One Step-Down DC-DC and Five Linear Regulators with I²C-Compatible Interface
Check for Samples: LP8720
FEATURES
1
•2 5 Low Noise LDO’s for up to 300 mA
• One High-Efficiency Synchronous Magnetic
Buck Regulator, I_OUT 400 mA
– High Efficiency PFM Mode @Low I_OUT
– Auto Mode PFM/PWM Switch
– Low Inductance 2.2 µH @ 2 MHz Clock
– Dynamic Voltage Scale Control
• I²C-Compatible Interface for the Controlling of
Internal Registers
• 20-Bump 2.5 x 2.0 mm DSBGA Package
KEY SPECIFICATIONS
• Programmable V_OUT from 0.8V to 2.3V on DC-
DC
• Automatic Soft Start on DC-DC
• 200 mV Typ Dropout Voltage at 300 mA on
LDO’s
• 2% (Typ) Output Voltage Accuracy on LDO’s
APPLICATIONS
• Cellular Handsets
• Portable Hand-Held Products
DESCRIPTION
The LP8720 is a multi-function, programmable Power
Management Unit, optimized for sub block power
requirement solutions. This device integrates one
highly efficient 400 mA step-down DC-DC converter
with Dynamic Voltage Scale (DVS), five low-noise low
dropout (LDO) voltage regulators, and a 400 KHz I²C-
compatible interface to allow a host controller access
to the internal control registers of the LP8720.
Additionally, the LP8720 features programmable
power-on sequencing.
LDO regulators provide high PSRR and low noise
ideally suited for supplying power to both analog and
digital loads. The package will be the smallest 2.5
mm x 2.0 mm 20-bump DSBGA package.
Typical Application Diagram
VBATT
2.2 µF
2.2 µF
2.2 µF
0.8V...2.3V
@400mA
VBATT
VINB
10 µF
FB
SW
10 µF
2.2 µH
GNDB
VSI
1.5k 1.5k 10k
IRQ_N
SDA
SCL
VBATT
DVS
EN
DEFSEL
VBATT
IDSEL
Buck
LP8720
Voltage
Reference
Thermal
Shutdown
Serial Interface
and
Control
LDO1
D-type
LDO2
A-type
LDO3
A-type
LDO4
LO-type
LDO5
D-type
LDO1
1.2V-3.3V
@300 mA
1 µF
VDD
LDO2
1 µF
1.2V-3.3V
@300 mA
LDO3
1 µF
1.2V-3.3V
@300 mA
LDO4
1 µF
0.8V-2.85V
@300 mA
LDO5
1 µF
1.2V-3.3V
@300 mA
GND
1
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2008–2013, Texas Instruments Incorporated