MCP73838T-NVI/MF Microchip Technology, MCP73838T-NVI/MF Datasheet - Page 18

IC LIION CHRGR USB/AC-IN 10DFN

MCP73838T-NVI/MF

Manufacturer Part Number
MCP73838T-NVI/MF
Description
IC LIION CHRGR USB/AC-IN 10DFN
Manufacturer
Microchip Technology
Datasheet

Specifications of MCP73838T-NVI/MF

Battery Type
Lithium-Ion (Li-Ion), Lithium-Polymer (Li-Pol)
Operating Temperature
-40°C ~ 85°C
Function
Charge Management
Voltage - Supply
4.5 V ~ 6 V
Mounting Type
Surface Mount
Package / Case
10-DFN
Input Voltage
6V
Battery Charge Voltage
4.5V
Charge Current Max
1000mA
Battery Ic Case Style
DFN
No. Of Pins
10
No. Of Series Cells
1
Product
Charge Management
Output Voltage
4.2 V, 4.35 V, 4.4 V, 4.5 V
Output Current
1200 mA
Operating Supply Voltage
3.75 V to 6 V
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Mounting Style
SMD/SMT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
MCP73838T-NVI/MF
Manufacturer:
Microchip Technology
Quantity:
135
MCP73837/8
5.0
5.1
5.1.1
The V
The MCP73837/8 can be supplied by either AC-
Adapter (V
source selection. The MCP73837/8 automatically
enters a Power-down mode if the voltage on the V
input falls to within +100 mV of the battery voltage or
below the UVLO voltage (V
draining the battery pack when both the V
supplies are not present.
5.1.2
For the MCP73837/8, the charge current regulation
can be scaled by placing a programming resistor
(R
resistor and the charge current are calculated using
the following equation:
EQUATION 5-1:
The
termination current are ratiometric to the fast charge
current based on the selected device options.
5.1.3
The battery charge control output is the drain terminal
of an internal P-channel MOSFET. The MCP73837/8
provides constant current and voltage regulation to the
battery pack by controlling this MOSFET in the linear
region. The battery charge control output should be
connected to the positive terminal of the battery pack.
5.1.4
The MCP73837/8 continuously monitors battery
temperature during a charge cycle by measuring the
voltage between the THERM and the V
internal 50 µA current source provides the bias for the
most common 10 kΩ negative-temperature coefficient
(NTC) or positive-temperature coefficient (PTC)
thermistors. The current source is controlled, avoiding
measurement sensitivity to fluctuations in the supply
voltage (V
DS22071A-page 18
Where:
PROG
R
DD
PROG
preconditioning
I
) from the PROG input to V
REG
DETAILED DESCRIPTION
Analog Circuitry
input is the input supply to the MCP73837/8.
DD
AC
BATTERY MANAGEMENT INPUT
SUPPLY (V
AC-ADAPTER CURRENT
REGULATION SET (PROG1)
BATTERY CHARGE CONTROL
OUTPUT (V
TEMPERATURE QUALIFICATION
(THERM)
). The MCP73837/8 compares the voltage
) or USB-Port (V
=
=
I
REG
kilo-ohms (kΩ)
milli-ampere (mA)
DD
current
=
BAT
STOP
)
---------------- -
R
1000V
)
PROG
USB
). This feature prevents
and
) with autonomous
SS
. The program
the
AC
SS
and V
pins. An
charge
USB
DD
at the THERM pin to factory set thresholds of 1.20V
and 0.25V, typically. Once a voltage outside the
thresholds is detected during a charge cycle, the
MCP73837/8 immediately suspends the charge cycle.
The MCP73837/8 suspends charge by turning off the
pass transistor and holding the timer value. The charge
cycle resumes when the voltage at the THERM pin
returns to the normal range.
If temperature monitoring is not required, place a
standard 10 kΩ resistor from THERM to V
5.1.5
The MCP73837/8 can be placed in a system test mode.
In this mode, the MCP73837/8 operates as a low drop-
out linear regulator (LDO). The output voltage is
regulated to the factory set voltage regulation option.
The available output current is limited to the pro-
grammed fast charge current. For stability, the V
output must be bypassed to V
capacitance of 1 µF for output currents up to 250 mA.
A minimum capacitance of 4.7 µF is required for output
currents above 250 mA.
The system test mode is entered by driving the THERM
input greater than (V
connected to the output. In this mode, the MCP73837/
8 can be used to power the system without a battery
being present.
5.2
5.2.1
The charge status outputs have two different states:
Low (L), and High Impedance (Hi-Z). The charge status
outputs can be used to illuminate LEDs. Optionally, the
charge status outputs can be used as an interface to a
host microcontroller.
the status outputs during a charge cycle.
Note 1: I
2: A pull-down current source on the
3: During system test mode, the PROG
4: System test mode shall be exited by
Digital Circuitry
SYSTEM TEST (LDO) MODE
STATUS INDICATORS AND POWER
GOOD (PG) OPTION
stand-by, and system test modes.
THERM input is active only in stand-by
and system test modes.
input sets the available output current
limit.
releasing the THERM input or cycling
input power.
THERM
Table 5-1
is disabled during shutdown,
DD
© 2007 Microchip Technology Inc.
- 100 mV) with no battery
summarizes the state of
SS
with a minimum
SS
.
BAT

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