LP28300 データシートの表示（PDF） - Unspecified
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LP28300 Datasheet PDF : 10 Pages
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Preliminary Datasheet
LP28300
Functional Pin Description
Package Type
Pin Configurations
TDFN- 10
VIN 1
TS 2
EN 3
STAT 4
BATT 5
LP28300
11
PGND
10 GND
9 SW
8 NC
7 VIN
6 SNS
Pin Description
PIN
VIN
TS
EN
STAT
BATT
SNS
NC
SW
GND
PGND
PIN
Number
1,7
2
3
4
5
6
8
9
10
11
DESCRIPTION
Positive Supply Voltage Input. This pin connects to the power devices inside the chip. VIN ranges from
4V to 5.5V for normal operation. Operation down to the under-voltage lockout threshold is allowed
with current limited wall adapters. Decouple with a 10µF or larger surface mounted ceramic capacitor.
NTC (Negative Temperature Coefficient) Thermistor Input. With an external 10kΩ NTC thermistor to
ground, this pin senses the temperature of the battery pack and stops the charger when the temperature
is out of range. To disable the temperature qualification function, ground the NTC pin.
Enable Input Pin. Pulling the EN pin high places the LP28300 into a low power state where the BAT
drain current drops to less than 3µA and the supply current is reduced to less than 50µA. For normal
operation, pull the pin low.
Open-Drain Charge Status Output. When the battery is charging, the STAT pin is pulled low by an
internal N-channel MOSFET. When the charge cycle is completed, When the LP28300 detects an
under voltage lockout condition, STAT is forced high impedance.
Battery Charger Output Terminal. Connect a 22µF ceramic chip capacitor between BAT and PGND to
keep the ripple voltage small.
Internal Sense Resistor. Connect to external inductor.
Current Amplifier Sense Input. A sense resistor, RSENSE, must be connected between the SENSE and
BAT pins. The maximum charge current is equal to 100mV/RSENSE.
No connector.
Switch Node Connection. This pin connects to the drains of the internal main and synchronous power
MOSFET switches. Connect to external inductor.
Ground.
Power Ground Pad.
LP28300 – 01 Version 1.1 Datasheet
Sep.-2010
www.lowpowersemi.com
Page 2 of 10
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