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参数资料
| 型号： | TC3827-4.1VUART |
| 元件分类： | 电源管理 |
| 英文描述： | POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封装： | MSOP-8 |
| 文件页数： | 3/9页 |
| 文件大小： | 122K |
| 代理商： | TC3827-4.1VUART |
3
Lithium-Ion Battery Charger
TC3827
TC3827-4 9/28/00
Pin No.
8-Pin MSOP
Symbol
Type
Description
1
SHDN
Signal Input
Shutdown Input
2
GND
Power
System Ground
3
MODE
Signal Output
Charge Mode Indicator
4IMON
Voltage Output
Buffered Copy of Current Sense Resistor Drop
5VOUT
Voltage Input
Charger DC Output Voltage Sense
6VDRV
Signal Output
Gate Drive to External MOSFET
7VSNS
Signal Input
Current Sense Voltage Input
8VIN
Power
Charger DC Input Voltage
PIN DESCRIPTION
FUNCTIONAL DESCRIPTION
The TC3827 controller only requires a P-channel power
MOSFET and two small capacitors to perform as an inex-
pensive Li-Ion battery charger. The TC3827 controller drives
an external PMOS to provide a regulated output current to
charge the battery. Initially, current limited charging occurs
until a pre-specified battery voltage is measured at the VOUT
pin. It then switches to constant-voltage mode. During
constant-voltage mode the TC3827 works like a linear
regulator, holding the output voltage within the specified
accuracy. The charger output is sensed at the VOUT pin. The
charging current follows the foldback characteristic as shown
in Figure 2. The sense resistor sets the maximum charging
current, IMAX. The voltage drop across the current sense
resistor is sensed at the VSNS input. An amplified copy of this
sense voltage is provided as output on the current monitor
pin (IMON). When the battery is deeply discharged to a
minimum voltage level, or if the battery is shorted, the
current sense circuit folds back the charge current to limit the
power dissipation of the PMOS. Both the VIN and VOUT pins
I/O DESCRIPTION
SHDN: When SHDN is low, VDRV is pulled high to VIN and the charge is interrupted.
GND:
Connect to the battery’s negative terminal. See Layout Guidelines for information on system grounding.
VOUT:
Battery positive terminal and charger regulated output voltage.This pin is connected to the external PMOS drain
and directly to the load for optimal regulation. VOUT pin draws typically 1A from the battery when VIN power
is removed. Requires a Bypass capacitor.
MODE: Charge Status Indicator. Mode is an open-drain, N-channel MOSFET capable of sinking
20mA for an LED status indication of charger in current limited mode. LED is off in current-voltage mode.
VDRV:
Gate drive output for the external PMOS pass device.
IMON :
Battery Charge current profile. This output is an amplified copy of the voltage drop across the current sense resistor.
It can be used as input to an A/D converter to provide the controller with information about the charge current
profile.
VIN:
Charger power supply input (+6V absolute max.). Bypass to GND with a capacitor.
VSNS:
Battery charge current sense voltage feedback. This voltage is developed across a small value precision resistor
that is in series with the battery.
of the IC need a suitable bypass capacitor. The TC3827 also
has a logic-level shutdown input, SHDN, which may be
connected to the input voltage to enable the IC. Pulling it
“low” or to ground will disable the PMOS drive (VDRV pulled
up to VIN voltage). Also, a charger mode pin (MODE) is
provided to drive an optional LED for a visual indication of
current limited mode operation. LED will be turned off in
constant voltage mode operation.
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