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
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MARKING
DIAGRAMS
1
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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
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
Cellular Phones
PDAs, MP3 Players
Stand−Alone Chargers
Battery Operated Devices
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)
Typical Applications
PIN CONNECTIONS
V
CC
FAULT
CFLG
TIMER
GND
1
2
3
4
5
(Top View)
DFN 3x3
10 BAT
9
8
7
6
VSNS
ISEL
V2P8
EN
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 15 of this data sheet.
©
Semiconductor Components Industries, LLC, 2009
February, 2009
−
Rev. 5
1
Publication Order Number:
NCP1835/D
NCP1835
V
in
CFLG
EN
V2P8
NCP1835
Microprocessor
FAULT
V
in
4.7
mF
C
in
V
CC
VSNS
BAT
GND
ISEL TIMER
15 nF
C
T
0.1
mF
C
2p8
4.7
mF
C
out
80 k
R
ISEL
GND
Figure 1. Typical Application Circuit
PIN FUNCTION DESCRIPTION
Pin
1
2
3
Symbol
V
CC
FAULT
CFLG
Description
Input Supply Voltage. Provides power to the charger. This pin should be bypassed with at least a 4.7
mF
ceramic
capacitor to ground.
An open−drain output indicating fault status. This pin is pulled LOW under any fault conditions. A FAULT condition
resets the counter.
An open−drain output indicating charging or end−of−charge states. The CFLG pin is pulled LOW when the
charger is charging a battery. It is forced open when the charge current drops to I
EOC
. This high impedance mode
will be latched until a recharge cycle or a new charge cycle starts.
Connecting a timing capacitor, C
TIME
between this pin and ground to set end−of−charge timeout timer.
TIMEOUT = 14*C
TIME
/1.0 nF (minute). The total charge for CC and CV mode is limited to the length of
TIMEOUT. Trickle Charge has a time limit of 1/8 of the TIMEOUT period.
Ground pin of the IC. For thermal consideration, it is recommended to solder the exposed metal pad on the
backside of the package to ground.
Enable logic input. Connect the EN pin to LOW to disable the charger or leave it floating to enable the charger.
2.8 V reference voltage output. This pin outputs a 2.8 V voltage source when an adapter is present. The
maximum loading for this pin is 2.0 mA.
The full charge current (I
FCHG
) can be set by connecting a resistor, R
ISEL
, from the ISEL pin to ground.
I
FCHG
= (0.8*10
5
/ R
ISEL
) A, the pre−charge current I
PC
= (0.1*I
FCHG)
A and the end−of−charge threshold current
I
EOC
= (0.1*I
FCHG
) A. For best accuracy, a resistor with 1% tolerance is recommended.
Battery voltage sense pin. Connect this as close as possible to the battery input connection.
Charge current output. A minimum 4.7
mF
capacitor is needed for stability when the battery is not attached.
4
TIMER
5
6
7
8
GND
EN
V2P8
ISEL
9
10
VSNS
BAT
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NCP1835
V
CC
Startup,
Control
& Clamp
V2P8
V2P8
BAT
Temp
IREF
CC
Control
CV
VREF
Recharge
Comp
ISEL
VCC
Resistor Bias Circuits
Dividers
Vbat
Resistor
Dividers
VSNS
VREF
CFLG
LOGIC
FAULT
VREF
Precharge
Comp
VREF
TIMER
Chip
Enable
Timer
Comp
VREF
EN
TIMER
GND
Figure 2. Detailed Block Diagram
MAXIMUM RATINGS
Rating
Supply Voltage
Status Flag Output Pins
Voltage Range for Other Pins
Current Out from BAT Pin
Thermal Characteristics
Thermal Resistance, Junction−to−Air (Note 3)
Power Dissipation, T
A
= 25°C (Note 3)
Moisture Sensitivity (Note 4)
Operating Ambient Temperature
Storage Temperature
ESD
Human Body Model
Machine Model
Symbol
V
CC
V
FAULT
, V
CFLG
V
io
I
O
R
qJA
P
D
MSL
T
A
T
stg
HBM
MM
Value
7.0
7.0
5.5
1.2
68.5
1.09
Level 1
−20
to 70
−55
to 125
2000
200
°C
°C
V
V
Unit
V
V
V
A
°C/W
W
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.
1. This device series contains ESD protection and is tested per the following standards:
Human Body Model (HBM) per JEDEC standard: JESD22−A114.
Machine Model (MM) per JEDEC standard: JESD22−A115.
2. Latchup Current Maximum Rating: 150 mA per JEDEC standard: JESD78.
3. Measure on 1 inch sq. of 1 oz. copper area. R
qJA
is highly dependent on the PCB heatsink area. For example, R
qJA
can be 38°C/W on 1 inch
sq. of 1 oz. copper area on 4 layer PCB that has 1 single signal layer with the additional 3 solid ground or power planes. The maximum package
power dissipation limit must not be exceeded:
PD
+
TJ(max)
*
TA
R
qJA
with R
qJA
= 68.5°C/W, T
J(max)
= 100°C, P
D
= 1.09 W.
4. Moisture Sensitivity Level per IPC/JEDEC standard: J−STD−020A.
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3
NCP1835
ELECTRICAL CHARACTERISTICS
(Typical values are tested at V
CC
= 5.0 V and room temperature, maximum and minimum values
Characteristic
V
CC
SUPPLY
Operating Supply Range
Rising V
CC
Threshold
Falling V
CC
Lockout Threshold
Quiescent V
CC
Pin Supply Current
Shutdown (EN = Low)
Normal Operation (EN = High)
Battery Drain Current
Manual Shutdown (V
CC
= 5.0 V, VSNS = 4.0 V, EN = Low)
CHARGING PERFORMANCE
Regulated Output Voltage in Constant Voltage (CV) Mode
4.2 V Version, I
CHG
= 10 mA
4.242 V Version, I
CHG
= 10 mA
Dropout Voltage (V
BAT
= 3.7 V, I
CHG
= 0.5 A)
Pre−Charge Threshold Voltage
Pre−Charge Current (R
ISEL
= 80 kW, V
BAT
= 2.0 V)
Recommended Full Charge Current
Full−Charge Current in Constant Current (CC) Mode (R
ISEL
= 80 kW, V
BAT
= 3.7 V)
End−of−Charge Threshold (R
ISEL
= 80 kW, V
BAT
= V
REG
)
Recharge Voltage Threshold
Thermal Foldback Limit (Junction Temperature) (Note 5)
OSCILLATOR
Oscillation Period (C
TIME
= 15 nF)
STATUS FLAGS
CFLG Pin Recommended Maximum Operating Voltage
FAULT Pin Recommended Maximum Operating Voltage
CFLG Pin Sink Current (V
CFLG
= 0.8 V)
FAULT Pin Sink Current (V
FAULT
= 0.8 V)
EN PIN
EN Pin High Level Threshold (Note 6)
EN Pin Low Level Threshold (Note 6)
5. Guaranteed by design. Not tested in production.
6. Not tested in production, but guaranteed by design and characterization at +25°C.
V
ENH
V
ENL
0.95
0.73
−
−
1.15
0.88
V
V
V
CFLG
V
FAULT
I
CFLG
I
FAULT
−
−
5.0
5.0
−
−
−
−
6.5
6.5
−
−
V
V
mA
mA
T
OSC
2.4
3.0
3.6
ms
V
REG
V
4.158
4.200
−
2.52
78
300
0.9
78
3.9
−
4.200
4.242
200
2.8
100
−
1.0
100
4.03
100
4.242
4.284
300
3.08
122
1000
1.1
122
4.155
−
mV
V
mA
mA
A
mA
V
°C
V
CC
V
RISE
V
FALL
I
VCC
I
VCC
I
BMS
2.8
3.0
2.0
−
−
−
−
3.4
2.4
30
1.0
−
6.5
3.95
2.8
−
−
3.0
V
V
V
mA
mA
mA
Symbol
Min
Typ
Max
Unit
are guaranteed over 0°C to 70°C with a supply voltage in the range of 4.3 V to 6.5 V, unless otherwise noted.)
−
V
PC
I
PC
I
FCHG
I
FCHG
I
EOC
V
RECH
T
LIM
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4
NCP1835
TYPICAL OPERATING CHARACTERISTICS
V
REG
, REGULATED OUTPUT VOLTAGE (V)
V
REG
, REGULATED OUTPUT VOLTAGE (V)
4.30
4.25
4.20
4.15
4.10
4.05
4.00
V
CC
= 5 V
R
ISEL
= 80 k
0
0.2
0.4
0.6
0.8
1
4.2 V
4.242 V
4.30
4.25
4.20
4.15
4.10
4.05
R
ISEL
= 80 k
4.00
4.5
5
5.5
V
CC
, INPUT VOLTAGE (V)
6
6.5
4.2 V
4.242 V
I
CHG
, CHARGE CURRENT (A)
Figure 3. Regulated Output Voltage vs. Charge
Current
V
REG
, REGULATED OUTPUT VOLTAGE (V)
4.30
V
ISEL
, ISEL VOLTAGE (V)
4.25
4.20
4.15
4.10
4.05
4.00
−50
V
CC
= 5 V
V
BAT
floating
−25
0
25
50
75
100
125
4.2 V
4.242 V
Figure 4. Regulated Output Voltage (floating) vs.
Input Voltage
0.80
0.78
0.76
0.74
0.72
0.70
4.5
4.242 V
4.2 V
V
BAT
= 3.7 V
R
ISEL
= 80 k
5.0
5.5
6.0
6.5
T
A
, AMBIENT TEMPERATURE (°C)
V
CC
, INPUT VOLTAGE (V)
Figure 5. Regulated Output Voltage vs.
Temperature
3.00
2.95
2.90
2.85
2.80
2.75
2.70
4.5
4.2 V
V
BAT
floating
R
ISEL
= 80 k
I
V2P8
= 0
Figure 6. ISEL Voltage vs. Input Voltage
V
2P8
, V2P8 VOLTAGE (V)
4.242 V
5.0
5.5
6.0
6.5
V
CC
, INPUT VOLTAGE (V)
Figure 7. V2P8 Voltage vs. Input Voltage
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