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PDF NCP1835 Data sheet ( Hoja de datos )
| Número de pieza | NCP1835 | |
| Descripción | Integrated Li-Ion Charger | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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NCP1835
Integrated Li−Ion Charger
NCP1835 is an integrated linear charger specifically designed to
charge 1−cell Li−Ion batteries with a constant current, constant
voltage (CCCV) profile. It can charge at currents of up to 1.0 A.
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 NCP1835 can charge from a standard voltage−source
wall adapter as a CCCV charger, or from a current limited adapter to
limit power dissipation in the pass device.
Features
• Integrated Voltage and Current Regulation
• No External MOSFET, Sense Resistor or Blocking Diode Required
• Charge Current Thermal Foldback
• Integrated Pre−charge Current for Conditioning Deeply Discharged
Battery
• Integrated End−of−Charge (EOC) Detection
• 1% Voltage Regulation
• 4.2 V or 4.242 V Regulated Output Voltage
• Regulation Maintained without a Battery Present
• Programmable Full Charge Current 300 − 1000 mA
• Open−Drain Charger Status and Fault Alert Flags
• 2.8 V Output for AC Present Indication and Powering Charging
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Subsystems
• Minimum Input Voltage of 2.4 V Allows Use of Current Limited
Adapters
• Automatically Recharging if Battery Voltage Drops after Charging
Cycle is Completed
• Low Profile 3x3 mm DFN Package
• Pb−Free Packages are Available
Typical Applications
• Cellular Phones
• PDAs, MP3 Players
• Stand−Alone Chargers
• Battery Operated Devices
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MARKING
DIAGRAMS
1 1835
4200
ALYWG
G
DFN 3x3
MN SUFFIX
CASE 485C
1 1835
4242
ALYWG
G
1835 = Device Code
4200 = 4.2 V
4242 = 4.242 V
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = Pb−Free Package
(Note: Microdot may be in either location)
PIN CONNECTIONS
VCC 1
FAULT 2
CFLG 3
TIMER 4
GND 5
DFN 3x3
10 BAT
9 VSNS
8 ISEL
7 V2P8
6 EN
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 15 of this data sheet.
© Semiconductor Components Industries, LLC, 2006
February, 2006 − Rev. 3
1
Publication Order Number:
NCP1835/D
1 page  
NCP1835
TYPICAL OPERATING CHARACTERISTICS
4.30
4.25 4.242 V
4.30
4.242 V
4.25
4.20
4.15 4.2 V
4.20
4.2 V
4.15
4.10
4.05
VCC = 5 V
RISEL = 80 k
4.00
0
0.2 0.4 0.6 0.8
ICHG, CHARGE CURRENT (A)
1
Figure 2. Regulated Output Voltage vs. Charge
Current
4.10
4.05
RISEL = 80 k
4.00
4.5 5 5.5 6
VCC, INPUT VOLTAGE (V)
6.5
Figure 3. Regulated Output Voltage (floating) vs.
Input Voltage
4.30
4.242 V
4.25
4.20
4.2 V
4.15
4.10
4.05 VCC = 5 V
VBAT floating
4.00
−50
−25 0
25 50 75 100
TA, AMBIENT TEMPERATURE (°C)
Figure 4. Regulated Output Voltage vs.
Temperature
125
0.80
0.78
0.76 4.242 V
0.74 4.2 V
0.72 VBAT = 3.7 V
RISEL = 80 k
0.70
4.5
5.0 5.5 6.0
VCC, INPUT VOLTAGE (V)
Figure 5. ISEL Voltage vs. Input Voltage
6.5
3.00
2.95
2.90
VBAT floating
RISEL = 80 k
IV2P8 = 0
4.242 V
2.85
2.80 4.2 V
2.75
2.70
4.5
5.0 5.5 6.0
VCC, INPUT VOLTAGE (V)
Figure 6. V2P8 Voltage vs. Input Voltage
6.5
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5
5 Page 
NCP1835
APPLICATION INFORMATION
Input and Output Capacitor Selection
A 4.7 mF or higher value ceramic capacitor is
recommended for the input bypass capacitor. For the output
capacitor, when there is no battery inserted and the
NCP1835 is used as an LDO with 4.2 V or 4.242 V output
voltage, a 4.7 mF or higher value tantalum capacitor is
recommended for stability. With the battery attached, the
output capacitor can be any type with the value higher than
0.1 mF.
RISEL Resistor Selection for Programming Charge
Current
A single resistor, RISEL, between the ISEL pin and
ground programs the pre−charge current, full charge
current, and end−of−charge detection threshold. The
nominal voltage of ISEL is 0.8 V. The charge current out
of BAT pin is 100,000 times the current out of ISEL pin.
Therefore, the full charge current (IFCHG) is:
IFCHG + 100, 000
0.8
RISEL
(A)
(eq. 1)
IPC and IEOC are 10% of the value programmed above
with the RISEL resistor.
The following table and curves show the selection of the
resistance value for desired currents.
Table 2. Charge Current vs. RISEL
IFCHG (mA)
300
IPC / IEOC (mA)
30
RISEL (kW)
267
500 50 160
600 60 133.3
700 70 114.3
800 80 100
900 90 88.9
1000
100
80
1.6
1.4
1.2
1.0
0.8
0.18
0.16
0.14
0.12
0.10
0.08
0.06
0.04
0.02
0.00
80
100 120 140 160 180 200
RISEL (kW)
Figure 17. Pre−Charge Current (IPCHG) vs.
Current Select Resistor (RISEL)
CTIME Selection for Programming Charge Time
The NCP1835 offers an end−of−charge timeout timer to
prevent the battery from continuously charging which can
cause premature aging or safety issues. The timing
capacitor between TIMER pin and ground, CTIME, sets the
end−of−charge time, TIMEOUT, and the pre−charge
timeout. This capacitor is required for proper device
operation.
The internal oscillator charges CTIME to 1.2 V and then
discharges it to 0.6 V with 6 mA current in one period.
Therefore, the period of the oscillator is:
TOSC + 2
CTIME
IC
dVc + 0.2
106
CTIME (sec)
(eq. 2)
A 22−binary counter counts every oscillator period until
it reaches the maximum number corresponding to
end−of−charge time, TIMEOUT.
TIMEOUT + 222
TOSC + 14
CTIME
1 nF
(minute)
(eq. 3)
The NCP1835 will terminate charging and give a timeout
signal if the battery has not completed charging within the
TIMEOUT period. The timeout signal then forces the
FAULT pin low.
0.6
0.4
0.2
0.0
80
100 120 140 160 180 200
RISEL (kW)
Figure 16. Full−Charge Current (IFCHG) vs.
Current Select Resistor (RISEL)
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11
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| PDF Descargar | [ Datasheet NCP1835.PDF ] | |
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