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参数资料
| 型号： | MCP73838T-G8I/UN |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10 |
| 封装： | PLASTIC, MO-187BA, MSOP-10 |
| 文件页数： | 5/30页 |
| 文件大小： | 816K |
| 代理商： | MCP73838T-G8I/UN |
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2007 Microchip Technology Inc.
DS22071A-page 13
MCP73837/8
3.0
PIN DESCRIPTION
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1:
PIN FUNCTION TABLES
3.1
AC-Adapter Supply Input (VAC)
A supply voltage of VREG + 0.3V to 6V from ac-dc wall-
adapter is recommended. When both the AC-Adapter
and the USB-Port supply voltages are present at same
time, the AC-Adapter dominates the regulated charge
current with the maximum value of 1A. Bypass to VSS
with a minimum of 4.7 F is recommended.
3.2
USB-Port Supply Input (VUSB)
A supply voltage of VREG + 0.3V to 6V from USB-Port is
recommended. When no supply voltage from VAC pin is
available, the Li-Ion battery is charged directly from
USB-Port. Bypass to VSS with a minimum of 1 F is
recommended.
3.3
Charge Status Output 1 (STAT1)
STAT1 is an open-drain logic output for connection to a
LED for charge status indication. Alternatively, a pull-up
resistor can be applied for interfacing to a host micro-
controller.
3.4
Charge Status Output 2 (STAT2)
STAT2 is an open-drain logic output for connection to a
LED for charge status indication. Alternatively, a pull-up
resistor can be applied for interfacing to a host
microcontroller.
3.5
Battery Management 0V Reference
(VSS)
Connect to negative terminal of battery and input
supply.
3.6
Battery Charge Control Output
(VBAT)
Connect to the positive terminal of Li-Ion / Li-Polymer
batteries. Bypass to VSS with a minimum of 1 F to
ensure loop stability when the battery is disconnected.
3.7
AC-Adapter Current Regulation
Set (PROG1)
The AC-Adapter constant charge current is set by
placing a resistor from PROG1 to VSS. PROG1 is the
set point of precondition and termination when the AC-
Adapter is present.
PROG1 also functions as device charge control
enable. The MCP73837/8 is shut down when an
impedance value greater than 70 k
Ω is applied to
PROG1. When PROG1 is floating, the MCP73837/8
enters stand-by mode.
Pin Number
Symbol
I/O
Function
MSOP-10
DFN-10
11
VAC
I
AC-Adapter Supply Input
22
VUSB
I
USB-Port Supply Input
3
STAT1
O
Charge Status Output 1 (Open-Drain)
4
STAT2
O
Charge Status Output 2 (Open-Drain)
55
VSS
—
Battery Management 0V Reference
6
PROG1
I/O
Current Regulation Setting With AC-Adapter; Device Charge
Control Enable; Precondition Set Point for AC control
7
PROG2
I
Current Regulation Setting With USB-Port; Precondition Set Point
for USB control.
88
PG
O
Available on MCP73837: Power-Good Status Output (Open-Drain)
88
TE
I
Available on MCP73838: Timer Enable; Enables Safety Timer
(Active Low)
9
THERM
I/O
Thermistor Monitoring Input and Bias current; System Test (LDO)
Mode Input
10
VBAT
I/O
Battery Positive Input and Output Connection
—EP
VSS
—
EP (Exposed Thermal Pad); There is an internal electrical
connection between the exposed thermal pad and VSS. The EP
must be connected to the same potential as the VSS pin on the
Printed Circuit Board (PCB).
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