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 I
2
C 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
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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.
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
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
I
2
C 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
Smart Phone
Handheld Devices
Tablets
PDAs
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 30 of this data sheet.
Applications
©
Semiconductor Components Industries, LLC, 2013
March, 2013
−
Rev. 6
1
Publication Order Number:
NCP1851/D
NCP1851, NCP1851A
IN
NCP1851
CAP
CBOOT
SENSP
SENSN
WEAK
FET
BAT
NTC
SW
L
X
2.2
mH
R
SNS
68 mW
C
BOOT
10 nF
C
OUT
10
mF
SYSTEM
C
IN
1
mF
C
CAP
4.7
mF
VBUS
D+
D−
GND
C
CORE
2.2
mF
C
TRS
0.1
mF
CORE
Q
BAT
(*)
+
TRANS
USB PHY
ILIM1
ILIM2
OTG
AGND
PGND
FLAG
SCL
SDA
SPM
*Optional Battery FET.
Figure 1. Typical Application Circuit
PIN CONNECTIONS
1
2
3
4
5
A
IN
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
A1
A2
A3
A4
A5
B1
B2
B3
Name
IN
IN
SPM
SDA
SCL
CAP
CAP
OTG
Type
POWER
POWER
DIGITAL INPUT
DIGITAL
BIDIRECTIONAL
DIGITAL INPUT
POWER
POWER
DIGITAL INPUT
Description
Battery Charger Input. These two pins must be decoupled by at least 1
mF
capacitor and
connected together.
System Power Monitor input.
I
2
C data line
I
2
C clock line
CAP pin is the intermediate power supply input for all internal circuitry. Bypass with at
least 4.7
mF
capacitor. Must be tied together.
Enables OTG boost mode.
OTG = 0, the boost is powered OFF
OTG = 1 turns boost converter ON
Automatic charge current / Input current limiter level selection (can be defeated by I
2
C).
Charging state active low. This is an open drain pin that can either drive a status LED or
connect to interrupt pin of the system.
Connection from power MOSFET to the Inductor.
These pins must be connected together.
Analog ground / reference. This pin should be connected to the ground plane and must
be connected together.
Input current limiter level selection (can be defeated by I
2
C).
Input for the battery NTC (10 KW / B = 3900) or (4.7 KW / B = 3900) If not used, this pin
must be tied to GND to configure the NCP1851 and warn that NTC is not used.
Power ground. These pins should be connected to the ground plane and must be connec-
ted together.
Current sense input. This pin is the positive current sense input. It should be connected to
the R
SENSE
resistor positive terminal.
Current sense input. This pin is the negative current sense input. It should be connected
to the R
SENSE
resistor negative terminal. This pin is also voltage sense input of the
voltage regulation loop when the FET is present and open.
Battery FET driver output. When not used, this pin must be directly tied to ground.
Floating Bootstrap connection. A 10 nF capacitor must be connected between CBOOT
and SW.
Output supply to USB transceiver. This pin can source a maximum of 50 mA to the ex-
ternal USB PHY or any other IC that needs +5 V USB. This pin is Overvoltage protected
and will never be higher than 5.5 V. This pin should be bypassed by a 100 nF ceramic
capacitor.
5 V reference voltage of the IC. This pin should be bypassed by a 2.2
mF
capacitor. No
load must be connected to this pin.
Weak battery charging current source input.
Battery connection
B4
B5
C1
C2
C3
C4
C5
D1
D2
D3
D4
ILIM2
FLAG
SW
SW
AGND
ILIM1
NTC
PGND
PGND
SENSP
SENSN
DIGITAL INPUT
OPEN DRAIN
OUTPUT
ANALOG OUTPUT
ANALOG OUTPUT
ANALOG GROUND
DIGITAL INPUT
ANALOG INPUT
POWER GND
POWER GND
ANALOG INPUT
ANALOG INPUT
D5
E1
E2
FET
CBOOT
TRANS
ANALOG OUTPUT
ANALOG IN/OUT
ANALOG OUTPUT
E3
E4
E5
CORE
WEAK
BAT
ANALOG OUTPUT
ANALOG OUTPUT
ANALOG INPUT
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NCP1851, NCP1851A
Table 2. MAXIMUM RATINGS
Rating
IN (Note 1)
CAP (Note 1)
Power balls: SW (Note 1)
CBOOT (Note 1)
Sense/Control balls: SENSP, SENSN, VBAT, FET, TRANS, CORE, NTC,
FLAG and WEAK. (Note 1)
Digital Input: SCL, SDA, SPM, OTG, ILIM1 and ILIM2 (Note 1)
Input Voltage
Input Current
Storage Temperature Range
Maximum Junction Temperature (Note 2)
Moisture Sensitivity (Note 3)
Symbol
V
IN
V
CAP
V
SW
V
CBOOT
V
CTRL
Value
−0.3
to +28
−0.3
to +28
−0.3
to +24
−0.3
to V
SW
+7.0
−0.3
to +7.0
Unit
V
V
V
V
V
V
DG
I
DG
T
STG
T
J
MSL
−0.3
to +7.0 V
20
−65
to +150
−40
to +TSD
Level 1
V
mA
°C
°C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
Table 3. OPERATING CONDITIONS
Symbol
V
IN
V
DG
T
A
I
SINK
C
IN
C
CAP
C
CORE
C
OUT
L
X
R
SNS
R
qJA
T
J
1.
2.
3.
4.
Parameter
Operational Power Supply
Digital input voltage level
Ambient Temperature Range
FLAG sink current
Decoupling input capacitor
Decoupling Switcher capacitor
Decoupling core supply capacitor
Decoupling system capacitor
Switcher Inductor
Current sense resistor
Thermal Resistance Junction to Air
Junction Temperature Range
(Notes 2 and 4)
−40
1
4.7
2.2
10
2.2
68
60
25
+125
Conditions
Min
3
0
−40
25
Typ
Max
V
INOV
5.5
+85
10
Unit
V
V
°C
mA
mF
mF
mF
mF
mH
mW
°C/W
°C
According to JEDEC standard JESD22−A108.
A thermal shutdown protection avoids irreversible damage on the device due to power dissipation. See Electrical Characteristics.
Moisture Sensitivity Level (MSL): 1 per IPC/JEDEC standard: J−STD−020.
The R
qJA
is dependent on the PCB heat dissipation. Board used to drive this data was a 2s2p JEDEC PCB standard.
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4
NCP1851, NCP1851A
Table 4. ELECTRICAL CHARACTERISTICS
Min & Max Limits apply for T
A
between
−40°C
to +85°C and T
J
up to + 125°C for V
IN
between 3.6 V to 7 V (Unless otherwise noted).
Typical values are referenced to T
A
= + 25°C and V
IN
= 5 V (Unless otherwise noted).
Symbol
INPUT VOLTAGE
V
INDET
V
BUSUV
V
BUSOV
V
INOV
Valid input detection threshold
V
IN
rising
V
IN
falling
USB under voltage detection
V
IN
falling
Hysteresis
USB over voltage detection
V
IN
rising
Hysteresis
Valid input high threshold
V
IN
rising
Hysteresis
INPUT CURRENT LIMITING
I
INLIM
Input current limit
V
IN
= 5 V
I
INLIM
set to 100 mA
I
INLIM
set to 500 mA
I
INLIM
set to 900 mA
I
INLIM
set to 1500 mA
INPUT SUPPLY CURRENT
I
Q_SW
I
OFF
CHARGER DETECTION
V
CHGDET
Charger detection threshold
voltage
V
IN
– V
SENSN
, V
IN
rising
V
IN
– V
SENSN
, V
IN
falling
Battery leakage, V
BAT
= 4.2 V V
IN
= 0 V,
SDA = SCL = 0 V
Charger active state, Measured between
IN and CAP,V
IN
= 5 V
Programmable by I
2
C
Default value
Voltage regulation accuracy
Constant voltage mode, T
A
= 25°C
−0.5
−1
I2C Programmable granularity
BATTERY VOLTAGE THRESHOLD
V
SAFE
V
PRE
V
FET
Safe charge threshold voltage
Conditioning charge threshold
voltage
End of weak charge threshold
voltage
V
BAT
rising
V
BAT
rising
V
BAT
rising
Voltage range
Default value
Accuracy
I2C Programmable
granularity
V
RECHG
Recharge threshold voltage
Relative to V
CHG
setting register
−2
100
97
2.1
2.75
3.1
3.4
2
%
mV
%
2.15
2.8
2.2
2.85
3.6
V
V
V
25
−
40
20
100
30
150
50
mV
mV
VBUS supply current
No load, Charger active state
Charger not active, NTC disable
15
500
mA
mA
70
425
800
1.4
85
460
850
1.45
100
500
900
1.5
mA
mA
mA
A
3.55
2.95
4.3
50
5.55
25
7.1
200
3.6
3.0
4.4
100
5.65
75
7.2
300
3.65
3.05
4.5
150
5.75
125
7.3
400
V
V
V
mV
V
mV
V
mV
Parameter
Conditions
Min
Typ
Max
Unit
REVERVE BLOCKING CURRENT
I
LEAK
R
RBFET
V
BAT
leakage current
Input RBFET On resistance (Q1)
5
100
200
mA
mW
BATTERY AND SYSTEM VOLTAGE REGULATION
V
CHG
Output voltage range
3.3
3.6
0.5
1
4.5
V
V
%
%
mV
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