NCP1835B
Integrated Li−Ion Charger
NCP1835B is an integrated linear charger specifically designed to
charge 1−cell Li−Ion batteries with a constant current, constant
voltage (CCCV) profile.
Its low input voltage capability, adjustable charge current, ability
to maintain regulation without a battery, and its onboard thermal
foldback make it versatile enough to charge from a variety of wall
adapters. The NCP1835B can charge from a standard wall adapter or
from the USB port. It has been optimized to charge low capacity
batteries such as those found in wireless headsets and flash
memory−based MP3 players. It’s recommended charge current rate
is 30−300 mA.
http://onsemi.com
MARKING
DIAGRAM
1
1835B
ALYW
Features
1
• Integrated Voltage and Current Regulation
• No External MOSFET, Sense Resistor or Blocking Diode Required
• Charge Current Thermal Foldback
DFN 3x3
MN SUFFIX
CASE 485C
• Integrated Pre−charge Current for Conditioning a Deeply
1835B = Device Code
A
L
Y
W
= Assembly Location
= Wafer Lot
= Year
Discharged Battery
• Integrated End−of−Charge (EOC) Detection
• 1% Voltage Regulation
= Work Week
• 4.2 V Regulated Output Voltage
• Regulation Maintained without a Battery Present
• Programmable Full Charge Current
PIN CONNECTIONS
• Open−Drain Charger Status and Fault Alert Flags
V
CC
1
BAT
10
• 2.8 V Output for AC Present Indication and Powering Charging
FAULT
2
3
4
5
VSNS
9
8
7
6
Subsystems
• Minimum Input Voltage of 2.4 V Allows Use of Current Limited
Adapters
DFN 3x3
CFLG
ISEL
TIMER
V2P8
• Automatically Recharging if Battery Voltage Drops after Charging
GND
EN
Cycle is Completed
• Low Profile 3x3 mm DFN Package
• Pb−Free Package is Available
(Top View)
Typical Applications
• Wireless Headsets
• MP3 Players
ORDERING INFORMATION
†
Package
Device
Shipping
DFN−10
NCP1835BMNR2
NCP1835BMNR2G
3000 Units/Reel
3000 Units/Reel
• USB Appliances
• Battery Operated Devices
DFN−10
(Pb−Free)
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
©
Semiconductor Components Industries, LLC, 2005
1
Publication Order Number:
June, 2005 − Rev. 0
NCP1835B/D