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PDF NCP1851A Data sheet ( Hoja de datos )
| Número de pieza | NCP1851A | |
| Descripción | Fully Integrated Li-Ion Switching Battery Charger | |
| Fabricantes | ON Semiconductor | |
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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
http://onsemi.com
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
1 page  
NCP1851, NCP1851A
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 3.6 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
3.55 3.6 3.65 V
2.95 3.0 3.05 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
7.1 7.2 7.3 V
200 300 400 mV
INPUT CURRENT LIMITING
IINLIM
Input current limit
INPUT SUPPLY CURRENT
VIN = 5 V
IINLIM set to 100 mA
IINLIM set to 500 mA
IINLIM set to 900 mA
IINLIM set to 1500 mA
70 85 100 mA
425 460 500 mA
800 850 900 mA
1.4 1.45 1.5
A
IQ_SW
VBUS supply current
IOFF
CHARGER DETECTION
No load, Charger active state
Charger not active, NTC disable
15 mA
500 mA
VCHGDET
Charger detection threshold
voltage
REVERVE BLOCKING CURRENT
VIN – VSENSN, VIN rising
VIN – VSENSN, VIN falling
40 100 150 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
− 100 200 mW
3.3 4.5 V
3.6 V
Voltage regulation accuracy
Constant voltage mode, TA = 25°C
−0.5
−1
0.5 %
1%
I2C Programmable granularity
25 mV
BATTERY VOLTAGE THRESHOLD
VSAFE
VPRE
Safe charge threshold voltage
Conditioning charge threshold
voltage
VBAT rising
VBAT rising
2.1 2.15 2.2
V
2.75 2.8 2.85 V
VFET
End of weak charge threshold
voltage
VBAT rising
Voltage range
Default value
3.1 3.6 V
3.4
Accuracy
−2
2%
I2C Programmable
granularity
100 mV
VRECHG
Recharge threshold voltage
Relative to VCHG setting register
97 %
http://onsemi.com
5
5 Page 
NCP1851, NCP1851A
TYPICAL CHARACTERISTICS
Figure 6. VBUS Insertion
Figure 7. Charger Mode Efficiency
Figure 8. Automatic Charge Current
Figure 9. Dynamic Power Path
Figure 10. Boost Mode: Power−up
Figure 11. Over Voltage Protection
http://onsemi.com
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet NCP1851A.PDF ] | |
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