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PDF NCP1855 Data sheet ( Hoja de datos )
| Número de pieza | NCP1855 | |
| Descripción | Fully Integrated Li-Ion Switching Battery Charger | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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NCP1855
9 V / 2.5 A, 12 V / 2 A, Fully
Integrated Li-Ion Switching
Battery Charger with Power
Path Management and USB
On-The-Go Support
The NCP1855 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 supervisibon. An optional battery FET can be placed
between the system and the battery in order to isolate and supply the
system. The NCP1855 junction temperature is 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 NCP1855 also provides USB OTG support by boosting the
battery voltage as well as providing overvoltage protected power
supply for USB transceiver.
Features
• 2.5 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
• 1000 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
• 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
Typical Applications
• Smart Phone
• Handheld Devices
• Tablets
• PDAs
www.onsemi.com
MARKING
DIAGRAM
25 BUMP
FLIP−CHIP
CASE 499BN
1855
AYWW
G
1855 = Specific Device Code
A = Assembly Location
Y = Year
WW = Work Week
G = Pb−Free Package
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 25 of this data sheet.
© Semiconductor Components Industries, LLC, 2016
January, 2016 − Rev. 0
1
Publication Order Number:
NCP1855/D
1 page  
NCP1855
Table 4. ELECTRICAL CHARACTERISTICS
Min & Max Limits apply for TA between −40°C to +85°C and TJ up to +125°C for VIN between 3.9 V to 7 V (Unless otherwise noted).
Typical values are referenced to TA = + 25°C and VIN = 5 V (Unless otherwise noted).
Symbol
Parameter
Conditions
Min Typ Max Unit
INPUT VOLTAGE
VINDET
Valid input detection threshold
VBUSUV
USB under voltage detection
VIN rising
VIN falling
VIN falling
Hysteresis
3.8 3.85 3.9
V
3.55 3.6 3.65 V
4.3 4.4 4.5 V
50 100 150 mV
VBUSOV
USB over voltage detection
VIN rising
Hysteresis
5.55 5.65 5.75 V
25 75 125 mV
VINOV
Valid input high threshold
VIN rising
Hysteresis
15.5 15.75 16
V
125 375 600 mV
INPUT CURRENT LIMITING
IINLIM
Input current limit
VIN = 5 V
Maximum Current range
Default value
100 2000 mA
70 85 100 mA
Accuracy
from 500 mA to 2000 mA
I2C Programmable granularity
(From 500 mA to 2000 mA)
−15
100
0%
mA
INPUT SUPPLY CURRENT
IQ_SW
VBUS supply current
IOFF
CHARGER DETECTION
No load, Charger active state
Charger not active
15 mA
500 mA
VCHGDET
Charger detection threshold
voltage
REVERSE BLOCKING CURRENT
VIN – VSENSN, VIN rising
VIN – VSENSN, VIN falling
50 110 180 mV
20 30 50 mV
ILEAK
VBAT leakage current
Battery leakage, VBAT = 4.2 V, VIN = 0 V,
SDA = SCL = 0 V
5 mA
RRBFET Input RBFET On resistance (Q1)
Charger active state, Measured between
IN and CAP, VIN = 5 V
BATTERY AND SYSTEM VOLTAGE REGULATION
VCHG
Output voltage range
Programmable by I2C
Default value
− 45 75 mW
3.3 4.5 V
3.6 V
Voltage regulation accuracy
I2C Programmable granularity
Constant voltage mode, TA = 25°C
−0.5
−1
25
0.5 %
1%
mV
BATTERY VOLTAGE THRESHOLD
VSAFE
VPRE
Safe charge threshold voltage
Conditioning charge threshold
voltage
VBAT rising
VBAT rising
2.1 2.15 2.2
2.75 2.8 2.85
V
V
VFET
End of weak charge threshold
voltage
VBAT rising
Voltage range
Default value
3.1 3.6 V
3.4
Accuracy
I2C Programmable granularity
−2
100
2%
mV
VRECHG
Recharge threshold voltage
Relative to VCHG setting register
97 %
www.onsemi.com
5
5 Page 
NCP1855
CHARGE MODE OPERATION
Overview
The NCP1855 is a fully programmable single cell
Lithium−ion switching battery charger optimized for
charging from a USB compliant input supply. The device
integrates a synchronous PWM controller; power
MOSFETs, and monitoring the entire charge cycle 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 in case of
weak battery. The NCP1855 junction temperature and
battery temperature are monitored during charge cycle and
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 NCP1855 is fully programmable through I2C
interface (see Registers Map section for more details). All
registers can be programmed by the system controller at any
time during the charge process. The charge current (ICHG),
charge voltage (VCHG), and input current (IINLIM) are
controlled by a dynamic voltage and current scaling for
disturbance reduction. Is typically 10 ms for each step.
NCP1855 also provides USB OTG support by boosting
the battery voltage as well as an over voltage protected
power supply for USB transceiver.
Charge Profile
In case of application without QFET, the NCP1855
provides 4 main charging phases as described below.
Unexpected behaviour or limitations that can modify the
charge sequence are described further (see Charging Process
section).
IBAT
ICHG
VBAT
VCHG
VRECHG
IPRE
IEOC
ISAFE
VPRE
VSAFE
Safe
Pre
Charge Charge
Constant
Current
Constant
Voltage
End of
Charge
Figure 6. Typical Charging Profile of NCP1855
Safe Charge:
With a disconnected battery or completely empty battery,
the charge process is in safe charge state, the charge current
is set to ISAFE in order to charge up the system’s capacitors
or the battery. When the battery voltage reaches VSAFE
threshold, the battery enters in pre−conditioning.
Pre Conditioning (pre−charge):
In preconditioning (pre charge state), the DC−DC
convertor is enabled and an IPRE current is delivered to the
battery. This current is much lower than the full charge
current. The battery stays in preconditioning until the VBAT
voltage is lower than VPRE threshold.
Constant Current (full charge):
In the constant current phase (full charge state), the
DC−DC convertor is enabled and an ICHG current is
delivered to the load. As battery voltage could be sufficient,
the system may be awake and sink an amount of current. In
this case the charger output load is composed of the battery
and the system. Thus ICHG current delivered by the
NCP1855 is shared between the battery and the system:
ICHG = ISYS + IBAT.
www.onsemi.com
11
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| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet NCP1855.PDF ] | |
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