NCP1835MN24T2G ON Semiconductor, NCP1835MN24T2G Datasheet - Page 12

• Manufacturer Part Number: NCP1835MN24T2G
• Description: IC BATT CHRGR LIION 4.242V 10DFN
• Manufacturer: ON Semiconductor
• Type: Battery Chargerr

Specifications of NCP1835MN24T2G

• Function: Charge Management
• Battery Type: Lithium-Ion (Li-Ion)
• Voltage - Supply: 2.8 V ~ 6.5 V
• Operating Temperature: -20°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 10-VFDFN Exposed Pad
• Output Current: 1A
• Output Voltage: 4.2V
• Operating Supply Voltage (min): 2.8V
• Operating Supply Voltage (max): 6.5V
• Operating Temp Range: -20C to 70C
• Package Type: DFN
• Mounting: Surface Mount
• Pin Count: 10
• Operating Temperature Classification: Commercial
• Product: Charge Management
• Operating Supply Voltage: 2.8 V to 6.5 V
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: - 20 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: NCP1835MN24T2G; NCP1835MN24T2GOSTR

C
operation.
Table 3. TIMEOUT vs. C
Thermal Considerations
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.
Charging with Constant Voltage Adapters or Current
Limited Adapters
regulated adapters: a traditional constant voltage type or a
current limited type. Figure 19 illustrates the operation of
I
charge
V
TIME
The following Table 3 shows the desired TIMEOUT vs.
The NCP1835 is housed in a thermally enhanced
The NCP1835 can be powered from two types of
P
BAT
Figure 19. Typical Charge Curves with a Constant
V
dis
in
0
Charge
Trickle
sizes. The C
I
V
PC
C
PC
P1
P2
TIME
0.47
5.6
8.2
10
15
33
56
1
Charge
(nF)
I
FCHG
CC
Voltage Adapter
TIME
TIME
is required for proper device
Charge
Size
V
CV
REG
TIMEOUT (minute)
140
210
462
784
115
6.6
14
78
Inhibit
http://onsemi.com
Time
Time
Time
Time
12
I
charge
V
the linear charger powered with a standard constant voltage
adapter. The power dissipation in the linear charger is:
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 19 shows this.
thermal performance than the above example. A current
limited adapter operates as a constant voltage adapter
before the charge current reaches the current limit. I
must be less than the programmed full charge current
I
source the current limit I
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.
adapter occurs at the beginning of the constant voltage
mode, which is shown at point P3 in Figure 20. If P3 is
higher than P2, the maximum power dissipation that the
charger can handle, then the thermal foldback function will
be activated.
P
FCHG
BAT
V
dis
Figure 20. Typical Charge Curves with a Current
The maximum power dissipation P1 happens at the
Using the adapter’s current limit can provide better
The worst case power dissipation with a current limited
in
0
Charge
Trickle
. Once the current limit is reached, the adapter will
I
PC
V
PC
P dis + (V CC * V BAT)
I
FCHG
Charge
CC
I
Limited Adapter
LIM
P3
LIM
Charge
V
CV
while its output voltage will
REG
I CHG
Inhibit
Time
Time
Time
Time
(eq. 4)
LIM