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參數(shù)資料
| 型號： | TC3827 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | Lithium-Ion Battery Charger |
| 中文描述： | 鋰離子電池充電器 |
| 文件頁數(shù)： | 3/10頁 |
| 文件大小： | 143K |
| 代理商： | TC3827 |
3
Lithium-Ion Battery Charger
TC3827
TC3827-2 12/12/00
2001 Microchip Technology Inc. DS21558A
Pin No.
8-Pin MSOP
1
2
3
4
5
6
7
8
Symbol
SHDN
GND
MODE
I
MON
V
OUT
V
DRV
V
SNS
V
IN
Type
Signal Input
Power
Signal Output
Voltage Output
Voltage Input
Signal Output
Signal Input
Power
Description
Shutdown Input
System Ground
Charge Mode Indicator
Buffered Copy of Current Sense Resistor Drop
Charger DC Output Voltage Sense
Gate Drive to External MOSFET
Current Sense Voltage Input
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 V
OUT
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 V
OUT
pin. The
charging current follows the foldback characteristic as shown
in Figure 2. The sense resistor sets the maximum charging
current, I
MAX
. The voltage drop across the current sense
resistor is sensed at the V
SNS
input. An amplified copy of this
sense voltage is provided as output on the current monitor
pin (I
MON
). 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 V
IN
and V
OUT
pins
I/O DESCRIPTION
SHDN:
When SHDN is low, V
DRV
is pulled high to V
IN
and the charge is interrupted.
GND:
Connect to the battery’s negative terminal. See Layout Guidelines for information on system grounding.
V
OUT
:
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. V
OUT
pin draws typically 1
μ
A from the battery when V
IN
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.
V
DRV
:
Gate drive output for the external PMOS pass device.
I
MON
:
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.
V
IN
:
Charger power supply input (+6V absolute max.). Bypass to GND with a capacitor.
V
SNS
:
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
“l(fā)ow” or to ground will disable the PMOS drive (V
DRV
pulled
up to V
IN
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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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| TC3827-4.1VUA | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Lithium-Ion Battery Charger |
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