Preliminary Datasheet
LP78084
Total Power solution of Portable Applications
800mA Charge +800mA Buck DC/DC+300mA LDO
General Description
The LP78084 is a complete constant-current/
constant-voltage linear battery charger for a single-cell
4.2V lithium-ion battery with a 800mA step-down converter,
and a 300mA low dropout (LDO) linear regulator. The
input voltage range is 3.75V to 5.5V for the battery
charger and 2.6V to 5.5V for the step-down converter and
linear regulator, making it ideal for applications operating
with single-cell lithium-ion/polymer batteries.
The battery charger offers an integrated pass device, reverse
blocking protection, high accuracy current and voltage
regulation, charge status, and charge termination. The
charging current is programmable via external resistor
from 15mA to 800mA. In addition to these standard
features, the device offers current limit, thermal
protection, and soft-start.
The step-down converter is a highly integrated converter
operating at a 1.5MHz switching frequency, minimizing the
size of external components while keeping switching losses
low. It has independent input and enable pins. The output
voltage ranges from 0.6V to the input voltage.
The LP78084 linear regulator is designed for fast
transient response and good power supply ripple rejection.
Designed for 300mA of load current, it includes
short-circuit protection and thermal shutdown.
The LP78084 is available in a 16-lead 3mm*4mm TDFN
package and is rated over the -40°C to 85°C temperature
range.
Features
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Battery Charger:
Input Voltage Range : 3.75 V to 5.5V
Constant-Current/Constant-Voltage Operation
with Thermal Feedback to Maximize Charge
Rate Without Risk of Overheating
Internal 4.5 Hour Safety Timer for Termination
Charge Current Programmable Up to 800mA
with 5% Accuracy
C/10 Charge Current Detection Output
5 uA Supply Current in Shutdown Mode
Synchronous Buck Converter:
Input Voltage Range: 2.6V to 5.5V
Output Voltage Range: 0.6V to VIN
800mA Output Current
Up to 90% Efficiency
3 6 u A Quiescent Current
1.5MHz Switching Frequency
120 uS Start-Up Time
Linear Regulator:
300mA Output Current
Low Dropout: 150mV at 300mA
Fast Line and Load Transient Response
High Accuracy: ± 1.5%
8 4 u A Quiescent Current
Short-Circuit, Over-Temperature, and Current
Limit Protection
3 m m × 4 m m TDFN-16 Package
RoHS Compliant and 100% Lead (Pb)-Free
Order Information
LP78084 -
□ □ □ □ □
F: Pb-Free
Package Type
QV: TDFN-16
LDO Output Voltage
33: 3.3V
30: 3.0V
28: 2.8V
18: 1.8V
Typical Application Circuit
AC/USB
11
6
LP78084
AC/USB
EN_BAT
STAT
VINB
ENB
VinA
GND
GND
GND
GND
ENA
OUTA
Iset
5
7
BATT
LX
FB
8
15
1
R1
R2
VOUTA
VOUTB
VA
ENB
ENA
9
16
3
4
13
BATT
Applications
Portable Media Players/MP3 players
Cellular and Smart mobile phone
PDA/DSC
Marking Information
Please see website.
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Bluetooth Applications
LP78084 – 02 Ver. 1.1 Datasheet
Nov.-2007
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POWER [ LOWPOWER SEMICONDUCTOR INC ]
