Document
NCP1851, NCP1851A
Fully Integrated Li-Ion
Switching Battery Charger
with Power Path
Management and USB
On-The-Go Support
The NCP1851 is a fully programmable single cell Lithium−ion switching battery charger optimized for charging from a USB compliant input supply and AC adaptor power source. The device integrates a synchronous PWM controller, power MOSFETs, and the entire charge cycle monitoring including safety features under software supervision. An optional battery FET can be placed between the system and the battery in order to isolate and supply the system. The NCP1851 junction temperature and battery temperature are monitored during charge cycle, and both current and voltage can be modified accordingly through I2C setting. The charger activity and status are reported through a dedicated pin to the system. The input pin is protected against overvoltages.
The NCP1851 also provides USB OTG support by boosting the battery voltage as well as providing overvoltage protected power supply for USB transceiver.
Features
• 1.6 A Buck Converter with Integrated Pass Devices • Input Current Limiting to Comply to USB Standard • Automatic Charge Current for AC Adaptor Charging • High Accuracy Voltage and Current Regulation • Input Overvoltage Protection up to +28 V • Factory Mode • 500 mA Boosted Supply for USB OTG Peripherals • Reverse Leakage Protection Prevents Battery Discharge • Protected USB Transceiver Supply Switch • Dynamic Power Path with Optional Battery FET • Battery Temperature Sensing for Safe Operation (JEITA) • Silicon Temperature Supervision for Optimized Charge Cycle • Safety Timers • Flag Output for Charge Status and Interrupts • I2C Control Bus up to 3.4 MHz • Small Footprint 2.2 x 2.55 mm CSP Package • These Devices are Pb−Free and are RoHS Compliant
Applications
• Smart Phone • Handheld Devices • Tablets • PDAs
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MARKING DIAGRAM
25 BUMP FLIP−CHIP CASE 499BN
XXXX AYWW
G
XXXX = Specific Device Code A = Assembly Location Y = Year WW = Work Week G or G = Pb−Free Package
*Pb−Free indicator, “G” or microdot “ G”, may or may not be present.
ORDERING INFORMATION
See detailed ordering and shipping information in the package dimensions section on page 30 of this data sheet.
© Semiconductor Components Industries, LLC, 2013
March, 2013 − Rev. 6
1
Publication Order Number: NCP1851/D
VBUS D+ D−
GND
NCP1851, NCP1851A
CIN 1 mF CCAP 4.7 mF CCORE 2.2 mF
USB PHY
CTRS 0.1 mF
IN SW
NCP1851
CAP CORE
CBOOT SENSP SENSN WEAK
FET
TRANS
BAT NTC
ILIM1 ILIM2 OTG AGND PGND
FLAG SCL SDA
SPM
LX 2.2 mH
CBOOT 10 nF
RSNS 68 mW
COUT 10 mF
QBAT(*) +
*Optional Battery FET.
Figure 1. Typical Application Circuit
SYSTEM
PIN CONNECTIONS
1 A IN
234 5
IN
SPM
SDA
SCL
B CAP
CAP
OTG
ILIM2
FLAG
C SW
SW
AGND
ILIM1
NTC
D PGND
PGND
SENSP
SENSN
FET
E CBOOT
TRANS
CORE
WEAK
BAT
(Top View) Figure 2. Package Outline CSP
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NCP1851, NCP1851A
Table 1. PIN FUNCTION DESCRIPTION
Pin Name
Type
Descripti.