NCP1835MN24R2G [ONSEMI]
1.0 A 一节锂离子/锂聚合电池充电器;
| 型号： | NCP1835MN24R2G |
| 厂家： | 
ONSEMI |
| 描述： | 1.0 A 一节锂离子/锂聚合电池充电器 电池 电源管理电路 电源电路 |
| 文件： | 总17页 (文件大小：150K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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.
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MARKING
DIAGRAMS
Features
1
1835
4200
ALYWG
G
• 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
DFN 3x3
• Integrated End−of−Charge (EOC) Detection
• 1% Voltage Regulation
MN SUFFIX
CASE 485C
1
1835
4242
ALYWG
G
• 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
1835 = Device Code
4200 = 4.2 V
4242 = 4.242 V
• 2.8 V Output for AC Present Indication and Powering Charging
Subsystems
A
L
Y
W
G
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
• Minimum Input Voltage of 2.4 V Allows Use of Current Limited
Adapters
• Automatically Recharging if Battery Voltage Drops after Charging
Cycle is Completed
(Note: Microdot may be in either location)
• Low Profile 3x3 mm DFN Package
• Pb−Free Packages are Available
Typical Applications
• Cellular Phones
PIN CONNECTIONS
• PDAs, MP3 Players
• Stand−Alone Chargers
• Battery Operated Devices
V
1
2
3
4
5
BAT
10
9
CC
FAULT
VSNS
DFN 3x3
8
CFLG
ISEL
TIMER
V2P8
7
GND
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
1
Publication Order Number:
February, 2006 − Rev. 3
NCP1835/D
NCP1835
V
in
CFLG
EN
Microprocessor
V2P8
VSNS
BAT
FAULT
V
in
V
CC
4.7 mF
ISEL TIMER
GND
C
in
0.1 mF
4.7 mF
C
2p8
C
out
15 nF
80 k
C
T
R
ISEL
GND
Figure 1. Typical Application Circuit
PIN FUNCTION DESCRIPTION
Pin
Symbol
Description
1
V
CC
Input Supply Voltage. Provides power to the charger. This pin should be bypassed with at least a 4.7 mF ceramic
capacitor to ground.
2
3
FAULT
CFLG
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 . This high impedance mode
EOC
will be latched until a recharge cycle or a new charge cycle starts.
4
5
TIMER
GND
Connecting a timing capacitor, C
between this pin and ground to set end−of−charge timeout timer.
TIME
TIMEOUT = 14*C /1.0 nF (minute). The total charge for CC and CV mode is limited to the length of
TIME
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.
6
7
EN
Enable logic input. Connect the EN pin to LOW to disable the charger or leave it floating to enable the charger.
V2P8
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.
8
ISEL
The full charge current (I
) can be set by connecting a resistor, R
, from the ISEL pin to ground.
A and the end−of−charge threshold current
FCHG
ISEL
5
I
I
= (0.8*10 / R
) A, the pre−charge current I = (0.1*I
FCHG
ISEL
PC
FCHG)
= (0.1*I ) A. For best accuracy, a resistor with 1% tolerance is recommended.
FCHG
EOC
9
VSNS
BAT
Battery voltage sense pin. Connect this as close as possible to the battery input connection.
10
Charge current output. A minimum 4.7 mF capacitor is needed for stability when the battery is not attached.
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2
NCP1835
MAXIMUM RATINGS
Rating
Symbol
Value
7.0
Unit
V
Supply Voltage
V
CC
Status Flag Output Pins
Voltage Range for Other Pins
Current Out from BAT Pin
Thermal Characteristics
V
, V
7.0
V
FAULT CFLG
V
io
5.5
V
I
O
1.2
A
Thermal Resistance, Junction−to−Air (Note 3)
R
P
68.5
1.09
°C/W
W
q
JA
Power Dissipation, T = 25°C (Note 3)
A
D
Moisture Sensitivity (Note 4)
Operating Ambient Temperature
Storage Temperature
MSL
Level 1
−20 to 70
−55 to 125
T
A
°C
°C
T
stg
ESD
Human Body Model
Machine Model
HBM
MM
2000
200
V
V
Maximumratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit values
(not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied, damage
may occur and reliability may be affected.
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
is highly dependent on the PCB heatsink area. For example, R
can be 38°C/W on 1 inch
JA
q
JA
q
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:
T
* T
A
J(max)
P
D
+
R
qJA
with R
= 68.5°C/W, T
= 100°C, P = 1.09 W.
q
JA
J(max) D
4. Moisture Sensitivity Level per IPC/JEDEC standard: J−STD−020A.
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NCP1835
ELECTRICAL CHARACTERISTICS (Typical values are tested at V = 5.0 V and room temperature, maximum and minimum values
CC
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.)
Characteristic
Symbol
Min
Typ
Max
Unit
V
CC
SUPPLY
Operating Supply Range
Rising V Threshold
V
2.8
3.0
2.0
−
6.5
3.95
2.8
V
V
V
CC
V
3.4
2.4
CC
RISE
FALL
Falling V Lockout Threshold
V
CC
Quiescent V Pin Supply Current
CC
Shutdown (EN = Low)
Normal Operation (EN = High)
I
I
−
−
30
1.0
−
−
mA
mA
VCC
VCC
Battery Drain Current
I
−
−
3.0
mA
BMS
Manual Shutdown (V = 5.0 V, VSNS = 4.0 V, EN = Low)
CC
CHARGING PERFORMANCE
Regulated Output Voltage in Constant Voltage (CV) Mode
V
REG
V
4.2 V Version, I
4.242 V Version, I
= 10 mA
4.158
4.200
4.200
4.242
4.242
4.284
CHG
= 10 mA
CHG
Dropout Voltage (V
= 3.7 V, I
= 0.5 A)
−
−
2.52
78
200
2.8
100
−
300
3.08
122
1000
1.1
mV
V
BAT
CHG
Pre−Charge Threshold Voltage
Pre−Charge Current (R = 80 kW, V
V
PC
PC
= 2.0 V)
BAT
I
mA
mA
A
ISEL
Recommended Full Charge Current
Full−Charge Current in Constant Current (CC) Mode (R
I
I
300
0.9
78
FCHG
FCHG
= 80 kW, V
= 3.7 V)
1.0
100
4.03
100
ISEL
BAT
End−of−Charge Threshold (R
Recharge Voltage Threshold
= 80 kW, V
= V
)
I
122
4.155
−
mA
V
ISEL
BAT
REG
EOC
V
3.9
−
RECH
Thermal Foldback Limit (Junction Temperature) (Note 5)
T
°C
LIM
OSCILLATOR
Oscillation Period (C
= 15 nF)
T
OSC
2.4
3.0
3.6
ms
TIME
STATUS FLAGS
CFLG Pin Recommended Maximum Operating Voltage
FAULT Pin Recommended Maximum Operating Voltage
V
−
−
−
−
−
6.5
6.5
−
V
CFLG
FAULT
CFLG
V
−
V
CFLG Pin Sink Current (V
= 0.8 V)
I
5.0
5.0
mA
mA
CFLG
FAULT Pin Sink Current (V
= 0.8 V)
I
−
FAULT
FAULT
5. Guaranteed by design. Not tested in production.
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NCP1835
TYPICAL OPERATING CHARACTERISTICS
4.30
4.25
4.20
4.15
4.10
4.05
4.00
4.30
4.242 V
4.2 V
4.242 V
4.25
4.20
4.15
4.10
4.05
4.00
4.2 V
V
R
= 5 V
CC
= 80 k
ISEL
R
ISEL
= 80 k
0
0.2
0.4
0.6
0.8
1
4.5
5
5.5
6
6.5
I , CHARGE CURRENT (A)
CHG
V , INPUT VOLTAGE (V)
CC
Figure 2. Regulated Output Voltage vs. Charge
Current
Figure 3. Regulated Output Voltage (floating) vs.
Input Voltage
0.80
4.30
4.25
4.20
4.15
4.10
4.05
4.00
4.242 V
4.2 V
0.78
0.76
0.74
0.72
0.70
4.242 V
4.2 V
V
V
= 5 V
V
R
= 3.7 V
= 80 k
CC
BAT
floating
BAT
ISEL
−50
−25
0
25
50
75
100
125
4.5
5.0
5.5
, INPUT VOLTAGE (V)
CC
6.0
6.5
T , AMBIENT TEMPERATURE (°C)
A
V
Figure 4. Regulated Output Voltage vs.
Temperature
Figure 5. ISEL Voltage vs. Input Voltage
3.00
V
R
floating
= 80 k
= 0
BAT
ISEL
2.95
2.90
2.85
2.80
2.75
2.70
I
V2P8
4.242 V
4.2 V
4.5
5.0
5.5
, INPUT VOLTAGE (V)
6.0
6.5
V
CC
Figure 6. V2P8 Voltage vs. Input Voltage
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NCP1835
TYPICAL OPERATING CHARACTERISTICS
3.0
2.5
2.0
1.5
1.0
0.5
0.0
120
110
100
90
V
R
= 3.7 V
= 80 k
BAT
V
R
= 2.0 V
= 80 k
BAT
ISEL
ISEL
80
4.5
3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3
5.5
5.0
5.5
6.0
6.5
V , INPUT VOLTAGE (V)
CC
V , INPUT VOLTAGE (V)
CC
Figure 7. V2P8 Voltage vs. Input Voltage
Figure 8. Trickle Charge Current vs. Input Voltage
120
110
100
90
1200
1100
1000
80
900
800
V
V
= 5 V
CC
70
V
R
= 3.7 V
= 80 k
BAT
= 2.0 V
BAT
ISEL
60
−50
−25
0
25
50
75
100
125
4.5
5.0
5.5
6.0
6.5
T , AMBIENT TEMPERATURE (°C)
A
V , INPUT VOLTAGE (V)
CC
Figure 9. Trickle Charge Current vs. Temperature
Figure 10. Full Charge Current vs. Input Voltage
4.10
4.05
4.00
3.95
3.90
1000
800
600
400
200
0
4.242 V
4.2 V
V
CC
= 5 V
R
= 80 k
ISEL
4.5
5.0
5.5
6.0
6.5
2.5
3.0
V
3.5
4.0
4.5
V
, INPUT VOLTAGE (V)
, BATTERY VOLTAGE (V)
CC
BAT
Figure 12. Charge Current vs. Battery Voltage
Figure 11. Recharge Voltage vs. Input Voltage
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NCP1835
DETAILED OPERATING DESCRIPTION
Overview
recognizes the battery as severely discharged. In this state,
the NCP1835 pre−conditions (trickle charges) the battery
Rechargeable Li−Ion/Polymer batteries are normally
charged with a constant current (CC) until the terminal
voltage reaches a fixed voltage threshold, at which point a
constant voltage (CV) is applied and the current drawn by
the battery decays. The charging rate is determined by the
specific rating of the battery. For example, if the battery is
rated at 800 mA−hours, then the recommended maximum
charge rate is 800 mA. For a severely discharged cell, it
takes approximately 2.5−3.5 hours to recharge the battery
at the maximum rate. So, when one charges at less than the
maximum charge rate, the recharge time increases. Also,
the battery should not be continuously charged or the
battery could age faster than necessary. Because of this,
Li−Ion charging systems need to stop charging within a
prescribed time limit regardless of the charge rate.
by charging it at 10% of the full charge rate (I ). This slow
PC
charge prevents the battery from being damaged from high
fast charge currents when it is in a deeply discharged state.
The battery voltage should be trickle charged up to 2.8 V
before 1/8 of the preset end−of−charge time is expired. If
it cannot reach this voltage, than the battery is possibly
shorted or damaged. Therefore, the NCP1835 stops
charging and the pre−charge timeout signal asserts the
FAULT flag.
Once the cell voltage crosses the pre−charge threshold,
the device will transition to normal (full−rate) charging at
100% of the programmed full rate charge current (I
).
FCHG
As the NCP1835 charges the battery, the cell voltage rises
until it reaches the V threshold, (4.2 or 4.242 V). At the
REG
The NCP1835 is a fully integrated, stand−alone 1−cell
Li−Ion charger which performs the primary battery
charging functions and includes a timer which will
terminate charging if the battery has not completed
charging within a prescribed time period. The charging rate
is user programmable up to 1.0 A and the end−of−charge
timer is also programmable. The NCP1835 has a thermal
foldback loop which reduces the charge rate if the junction
temperature is exceeded. The device also includes several
outputs which can be used to drive LED indicators or
interface to a microprocessor to provide status information.
The adapter providing power to the charger can be a
standard fixed output voltage such as a 5.0 V wall adapter
or it can be a simple current limited adapter.
maximum charge rate, it normally takes about 1 hour to
reach this point from a fully discharged state, and the
battery will be approximately 70−80% recharged. At this
point, the charge transitions to constant voltage mode
where the IC forces the battery to remain at a constant
voltage, V . During this constant voltage state, the
REG
current required to maintain V
steadily decreases as the
REG
battery approaches full charge. Charge current eventually
falls to a very low value as the battery approaches a fully
charged condition.
The NCP1835 monitors the current into the battery until
it drops to 10% of the full charge rate. This is the
End−of−Charge (EOC) threshold. Normally it takes
1.5−2.5 hours to reach this point. Once the NCP1835
reaches end−of−charge it opens the CFLG pin and enters
the EOC state. The IC continues to charge the battery until
it reaches TIMEOUT. At that point, the NCP1835 stops
charging. If the system does not reach EOC during the
TIMEOUT period, the NCP1835 views this as a system
fault and asserts the FAULT flag. If the battery voltage
drops below the recharge threshold (which can occur if the
battery is loaded), the IC reinitializes the charging
sequence and begins a new charge cycle. The recharge
The NCP1835 comes in two versions with output voltage
regulation thresholds of 4.2 or 4.242 V depending on the
requirements of the specific battery pack being used. The
user determines the charge current by selecting the resistor
R
and determines the length of the end−of−charge
ISEL
timeout timer by selecting the capacitor, C
.
TIME
Charging Operation
Figure 13 outlines the charging algorithm of the
NCP1835 and Figure 14 graphically illustrates this. When
the charger is powered up and the input voltage rises above
the power−on, rising threshold (nominally 3.4 V), the
charger initiates the charging cycle.
voltage threshold, V , is nominally 4.03 V.
RECH
In the inhibit state, the NCP1835 continues to monitor
the battery voltage, but does not charge the battery. Again,
if the battery voltage drops below the recharge threshold
the IC reinitializes the charging sequence and begins a new
charge cycle.
The NCP1835 first determines the cell voltage. If it is
less than the pre−charge threshold (2.8 V), the IC
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NCP1835
Charging Flow Chart
Power Up
V
CC
> V ?
POR
N
Y
POR
Initialization
Reset Counter
CC
CV
Charge
Charge
Trickle
Charge
V
SNS
≥ V ?
REG
I
ch
< I
EOC
?
Y
Y
V
SNS
> V ?
PC
Y
N
N
N
N
TIMEOUT?
Y
TIMEOUT?
Y
N
N
1/8 TIMEOUT?
Y
Constant
Current
Charge
Constant
Voltage
Charge
Trickle
Charge
EOC Indication;
Set CFLG High
Keep FAULT High
Charger Inhibited
Reset Counter
Set FAULT Low
Latch Up Charger
Y
V
SNS
< V
?
RECH
V
SNS
<
N
N
V
RECH
?
N
Y
EN Toggled?
Y
End−of−Charge
or FAULT
TIMEOUT?
N
Y
Start Recharge
Inhibit
Figure 13. Charging Flow Chart
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NCP1835
Trickle
Charge Charge
CC
CV
Charge
End of
Charge Inhibit
Recharging
Vin
V
RISE
Time
V
REG
V
REG
VBAT
V
RECH
V
PC
Time
I
I
CHG
CHG
Icharge
I
I
EOC
PC
Time
Time
CFLG
FAULT
Time
Time
2.8 V
V2P8
0
Figure 14. Typical Charging Diagram
Table 1. Charge Status
Condition
CFLG
Low
FAULT
High
Trickle, Constant Current and Constant Voltage Charge
End−of−Charge or Shutdown Mode
High
High
High
Timeout Fault, V
< 0.35 V or V
> 1.4 V
Low
ISEL
ISEL
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NCP1835
Charge Status Indicator (CFLG)
Enable/Disable (EN)
Pulling the EN pin to GND disables the NCP1835. In
shutdown mode, the internal reference, oscillator, and
control circuits are all turned off. This reduces the battery
drain current to less than 3.0 mA and the input supply
current to 30 mA. Floating the EN pin enables the charger.
CFLG is an open−drain output that indicates battery
charging or End−of−Charge (EOC) status. It is pulled low
when charging in constant current mode and constant
voltage mode. It will be forced to a high impedance state
when the charge current drops to I
. When the charger
EOC
is in shutdown mode, CFLG will also stay in the high
impedance state.
Thermal Foldback
An internal thermal foldback loop reduces the
programmed charge current proportionally if the die
temperature rises above the preset thermal limit (nominally
100°C). This feature provides the charger protection from
over heating or thermal damage. Figure 15 shows the full
charge current reduction due to die temperature increase
across the thermal foldback limit. For a charger with a
1.0 A constant charge current, the charge current starts
decreasing when the die temperature hits 100°C and is
reduced to zero when the die temperature rises to 110°C.
Fault Indicator (FAULT)
FAULT is an open−drain output that indicates that a
charge fault has occurred. It has two states: low or high
impedance. In a normal charge cycle, it stays in a high
impedance state. At fault conditions, it will be pulled low
and terminate the charge cycle. A timeout fault occurs
when the full charge or pre−charge timeouts are violated,
or if the voltage on ISEL is greater than 1.4 V or lower than
0.35 V. There are two ways to get the charger out of a fault
condition and back to a normal charge cycle. One can either
toggle the EN pin from GND to a floating state or reset the
input power supply.
I
FCHG
X−100 mA/C
Adapter Present Indicator (V2P8)
V2P8 is an input power supply presence indicator. When
the input voltage, V , is above the power on threshold
CC
(V
, nominally 3.4 V) and is also 100 mV above the
RISE
battery voltage, it provides a 2.8 V reference voltage that
can source up to 2.0 mA. This voltage can also be used to
power a microprocessor I/O.
100°C
T , JUNCTION TEMPERATURE
J
Figure 15. Full Charge Current vs. Junction
Temperature
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NCP1835
APPLICATION INFORMATION
0.18
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.
0.16
0.14
0.12
0.10
0.08
0.06
0.04
0.02
0.00
RISEL Resistor Selection for Programming Charge
Current
A single resistor, R
between the ISEL pin and
ISEL,
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.
80
100
120
140
(kW)
160
180
200
R
ISEL
Figure 17. Pre−Charge Current (IPCHG) vs.
Current Select Resistor (RISEL
)
Therefore, the full charge current (I ) is:
FCHG
0.8
ISEL
I
+ 100,000
(A)
(eq. 1)
FCHG
CTIME Selection for Programming Charge Time
R
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
I
and I
are 10% of the value programmed above
resistor.
PC
EOC
with the R
ISEL
The following table and curves show the selection of the
resistance value for desired currents.
capacitor between TIMER pin and ground, C , sets the
TIME
end−of−charge time, TIMEOUT, and the pre−charge
timeout. This capacitor is required for proper device
operation.
Table 2. Charge Current vs. RISEL
I
(mA)
I
/ I
(mA)
R
ISEL
(kW)
FCHG
PC EOC
The internal oscillator charges C
to 1.2 V and then
TIME
300
30
50
267
discharges it to 0.6 V with 6 mA current in one period.
Therefore, the period of the oscillator is:
500
600
700
800
900
1000
160
133.3
114.3
100
60
C
dV
c
C
TIME
T
OSC
+ 2
+ 0.2 106 C
TIME
(sec)
(eq. 2)
I
70
80
A 22−binary counter counts every oscillator period until
it reaches the maximum number corresponding to
end−of−charge time, TIMEOUT.
90
88.9
80
100
C
1 nF
TIME
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
TIMEOUT + 222 T
+ 14
(minute)
OSC
(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.
80
100
120
140
160
180
200
R
ISEL
(kW)
Figure 16. Full−Charge Current (IFCHG) vs.
Current Select Resistor (RISEL
)
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11
NCP1835
The following Table 3 shows the desired TIMEOUT vs.
sizes. The C is required for proper device
the linear charger powered with a standard constant voltage
adapter. The power dissipation in the linear charger is:
C
TIME
TIME
operation.
P
dis
+ (V
CC
* V
BAT)
I
CHG
(eq. 4)
Table 3. TIMEOUT vs. CTIME Size
The maximum power dissipation P1 happens at the
beginning of a full current charge, since this is the point that
the power supply and the battery voltage have the largest
difference. As the battery voltage rises during charging, the
power dissipation drops. After entering the constant
voltage mode, the power dissipation drops further due to
the decreasing charge current. The maximum power that
the linear charger can dissipate is dependent on the thermal
resistance of the device. In case the device can not handle
the maximum power P1, the thermal foldback loop reduces
the charge current which limits the power dissipation to the
sustained level P2. Figure 18 shows this.
C
TIME
(nF)
TIMEOUT (minute)
0.47
6.6
14
1
5.6
8.2
10
15
33
56
78
115
140
210
462
784
Using the adapter’s current limit can provide better
thermal performance than the above example. A current
limited adapter operates as a constant voltage adapter
Thermal Considerations
The NCP1835 is housed in a thermally enhanced
3x3 mm DFN package. In order to deliver the maximum
power dissipation under all conditions, it is very important
that the user solders exposed metal pad under the package
to the ground copper area and then connect this area to a
ground plane through thermal vias. This can greatly reduce
the thermal impedance of the device and further enhance
its power dissipation capability and thus its output current
capability.
before the charge current reaches the current limit. I
LIM
must be less than the programmed full charge current
. Once the current limit is reached, the adapter will
I
FCHG
source the current limit I
while its output voltage will
LIM
drop to follow the battery voltage. If the application uses
the adapter to power its systems while the battery is being
charged, this drooping voltage can be an issue.
The worst case power dissipation with a current limited
adapter occurs at the beginning of the constant voltage
mode, which is shown at point P3 in Figure 19. If P3 is
higher than P2, the maximum power dissipation that the
charger can handle, then the thermal foldback function will
be activated.
Charging with Constant Voltage Adapters or Current
Limited Adapters
The NCP1835 can be powered from two types of
regulated adapters: a traditional constant voltage type or a
current limited type. Figure 18 illustrates the operation of
Trickle
Charge
CC
Charge
CV
Charge
Trickle
Charge
CC
Charge
CV
Charge
Inhibit
Inhibit
V
in
V
in
Time
Time
Time
Time
V
REG
V
REG
V
BAT
V
BAT
V
PC
V
PC
I
I
charge
I
charge
I
FCHG
FCHG
I
LIM
I
PC
I
PC
Time
Time
Time
Time
P
P
dis
dis
P1
P2
P3
0
0
Figure 18. Typical Charge Curves with a Constant
Voltage Adapter
Figure 19. Typical Charge Curves with a Current
Limited Adapter
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12
NCP1835
PCB Layout Recommendations
The recommended footprint for the 3x3 mm DFN
package is included on the Package Dimension page. It is
critical that the exposed metal pad is properly soldered to
the ground copper area and then connected to a ground
plane through thermal vias. The maximum recommended
thermal via diameter is 12 mils (0.305 mm). Limited by the
size of the pad, six thermal vias should allow for proper
thermal regulation without sacrificing too much copper
area within the pad. The copper pad is the primary heatsink
and should be connected to as much top layer metal as
possible to minimize the thermal impedance. Figure 20
illustrates graphically the recommended connection for the
exposed pad with vias.
GND
Figure 20. Recommended Footprint
The following is a NCP1835 Demo Board Schematic, Layout, and suggested Bill of Materials.
V
(T1)
BAT
NCP1835
V
(T8)
VCC
BAT
VSNS
ISEL
V2P8
EN
CC
FAULT
CFLG
TIMER
R4
D1
R5
D2
VSNS
(T7)
TIMER
(T10)
V2P8
(T4)
C5
R9
R1
+
−
Li−Ion
Battery
GND
FAULT
(T5)
D3
R2
C1
C2
VCC
C3
C4
R8
R3
JP1
CFLG
(T6)
GND
(T2)
JP2
GND
(T9)
Figure 21. Demo Board Schematic
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13
NCP1835
Figure 22. Silkscreen Layer
Figure 23. Top Layer
Figure 24. Bottom Layer
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14
NCP1835
Table 4. Bill of Materials
Item
1
Qty.
1
Part Description
Designators
Suppliers
ON Semiconductor
Vishay
Part Number
NCP1835
NCP1835 Integrated Li−Ion Charger (DFN−10)
Chip Resistor "1% 0 W (0603)
Chip Resistor "1% 160 kW (0603)
Chip Resistor "1% 100 kW (0603)
Chip Resistor "1% 1.0 kW (0603)
Chip Resistor "1% 432 W (0603)
Chip Capacitor 1.0 mF/16 V, "20% (0805)
Chip Capacitor 4.7 mF/10 V, "20% (3528−21)
Chip Capacitor 0.1 mF/10 V, "10% (0402)
Chip Capacitor 15 nF/16 V, "10% (0402)
Chip Capacitor 4.7 mF/25 V, "20% (0805)
SMT Chip LED Red
U1
R1
2
1
CRCW06030R00F
CRCW06031603F
CRCW06031003F
CRCW06031001F
CRCW06034320F
ECJGVB1C105M
T491B475K010AS
ECJ0EB1A104K
ECJ0EB1C153K
ECJ2FB1E475M
HSMH−C150
3
2
R2, R9
R3
Vishay
4
1
Vishay
5
2
R4, R5
R8
Vishay
6
1
Vishay
8
1
C1
Panasonic
Kemet
9
1
C2
10
11
12
13
14
15
16
1
C3
Panasonic
Panasonic
Panasonic
Agilent
1
C4
1
C5
1
D1
1
SMT Chip LED Green
D2
Agilent
HSMG−C150
1
SMT Chip LED Yellow
D4
Agilent
HSMY−C150
5
Test Pin
T1, T2, T7,
T8, T9, T10
AMP/Tyco
4−103747−0
17
2
Header Pin Pinch = 2.54 mm
JP1, JP2
AMP/Tyco
4−103747−0
ORDERING INFORMATION
Device
†
Voltage Option
4.2 V
Package
Shipping
NCP1835MN20R2
NCP1835MN20R2G
DFN−10
3000 / Tape & Reel
3000 / Tape & Reel
4.2 V
DFN−10
(Pb−Free)
NCP1835MN24T2
NCP1835MN24T2G
4.242 V
4.242 V
DFN−10
3000 / Tape & Reel
3000 / Tape & Reel
DFN−10
(Pb−Free)
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
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15
NCP1835
PACKAGE DIMENSIONS
DFN10, 3 x 3mm, 0.5mm Pitch
CASE 485C−01
ISSUE A
D
A
B
NOTES:
1. DIMENSIONING AND TOLERANCING PER
ASME Y14.5M, 1994.
EDGE OF PACKAGE
2. CONTROLLING DIMENSION: MILLIMETERS.
3. DIMENSION b APPLIES TO PLATED
TERMINAL AND IS MEASURED BETWEEN
0.25 AND 0.30 MM FROM TERMINAL.
4. COPLANARITY APPLIES TO THE EXPOSED
PAD AS WELL AS THE TERMINALS.
5. TERMINAL b MAY HAVE MOLD COMPOUND
MATERIAL ALONG SIDE EDGE. MOLD
FLASHING MAY NOT EXCEED 30 MICRONS
ONTO BOTTOM SURFACE OF TERMINAL b.
6. DETAILS A AND B SHOW OPTIONAL VIEWS
FOR END OF TERMINAL LEAD AT EDGE OF
PACKAGE.
L1
E
PIN 1
DETAIL A
Bottom View
(Optional)
REFERENCE
2X
0.15
C
TOP VIEW
MILLIMETERS
2X
0.15
C
DIM MIN
0.80
A1 0.00
MAX
1.00
0.05
A
(A3)
A3
b
D
D2 2.45
E
0.20 REF
DETAIL B
0.18
0.30
0.10
0.08
C
C
3.00 BSC
2.55
3.00 BSC
1.85
0.50 BSC
0.19 TYP
A
SEATING
PLANE
10X
E2 1.75
e
K
L
SIDE VIEW
A1
C
0.35
0.45
0.03
EXPOSED Cu
L1 0.00
D2
e
MOLD CMPD
DETAIL A
10X
L
1
5
A3
A1
DETAIL B
Side View
(Optional)
E2
10X
K
10
6
10X b
0.10
0.05
C
C
A
B
BOTTOM VIEW
NOTE 3
SOLDERING FOOTPRINT*
2.6016
1.8508
3.3048
2.1746
10X
0.5651
10X
0.5000 PITCH
0.3008
DIMENSIONS: MILLIMETERS
*For additional information on our Pb−Free strategy and soldering
details, please download the ON Semiconductor Soldering and
MountingTechniques Reference Manual, SOLDERRM/D.
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16
NCP1835
ON Semiconductor and
are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice
to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any
liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental
damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over
time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under
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or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death
may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees,
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NCP1835/D
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