MCP73871-2CAI/ML Microchip Technology, MCP73871-2CAI/ML Datasheet - Page 15

• Manufacturer Part Number: MCP73871-2CAI/ML
• Description: IC USB/AC BATT CHRGR W/PPM 20QFN
• Manufacturer: Microchip Technology

Specifications of MCP73871-2CAI/ML

• Battery Type: Lithium-Ion (Li-Ion), Lithium-Polymer (Li-Pol)
• Function: Charge Management
• Voltage - Supply: 4.4 V ~ 6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 20-VFQFN Exposed Pad
• Input Voltage: 6V
• Battery Charge Voltage: 4.5V
• Charge Current Max: 1A
• Battery Ic Case Style: QFN
• No. Of Pins: 20
• No. Of Series Cells: 1
• Product: Charge Management
• Output Voltage: 4.2 V
• Output Current: 50 mA to 1000 mA
• Operating Supply Voltage: 4.5 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
• For Use With: MCP73871DM-VPCC - DEMO BOARD FOR MCP73871MCP73871EV - EVALUATION BOARD FOR MCP73871
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

3.0
The descriptions of the pins are listed in
TABLE 3-1:
3.1
A supply voltage of V
recommended. Bypass to V
4.7 µF.
3.2
The MCP73871 device powers the system via output
terminals while independently charging the battery.
This feature reduces the charge and discharge cycles
on the battery, allows for proper charge termination and
the system to run with an absent or defective battery
pack. Also, this feature gives the system priority on
input power, allowing the system to power-up with
deeply depleted battery packs. Bypass to V
minimum of 4.7 µF is recommended.
© 2009 Microchip Technology Inc.
Legend: I = Input, O = Output, I/O = Input/Output
10, 11, EP
Number
Note:
14, 15
18, 19
1, 20
Pin
12
13
16
17
2
3
4
5
6
7
8
9
PIN DESCRIPTION
Power Supply Input (IN)
System Output Terminal (OUT)
The input pins should always tie to either High or Low, and never allow floating to ensure operation properly.
V
BAT_SENSE
Symbol
THERM
PROG2
STAT1 /
PROG3
PROG1
STAT2
VPCC
OUT
V
LBO
SEL
V
PG
CE
TE
PIN FUNCTION TABLES
IN
BAT
SS
REG
I/O
I/O
I/O
I/O
I/O
I/O
—
O
O
O
O
SS
I
I
I
I
I
I
+ 0.3V to 6V is
with a minimum of
System Output Terminal
Voltage proportional charge control
Input type selection (Low for USB port, High for ac-dc adapter)
USB port input current limit selection when SEL = Low.
(Low = 100 mA, High = 500 mA)
Thermistor monitoring input and bias current
Power-Good Status Output (Open-Drain)
Charge Status Output 2 (Open-Drain)
Charge Status Output 1 (Open-Drain). Low battery output indicator when
V
Timer Enable; Enables Safety Timer when active Low
Battery Management 0V Reference. EP (Exposed Thermal Pad); There is an
internal electrical connection between the exposed thermal pad and V
must be connected to the same potential as the V
Board (PCB)
Termination set point for both ac-dc adapter and USB port
Fast charge current regulation setting with SEL = High. Preconditioning set point
for both USB port and ac-dc adapter.
Battery Positive Input and Output connection
Battery Voltage Sense
Device Charge Enable; Enabled when CE = High
Power Supply Input.
BAT
Table
> V
IN
SS
3-1.
with a
3.3
If the voltage on the IN pin drops to a preset value,
determined by the threshold established at the VPCC
input, due to a limited amount of input current or input
source impedance, the battery charging current is
reduced. Further demand from the system is supported
by the battery, if possible. To active this feature, simply
supply 1.23V or greater to VPCC pin. This feature can
be disabled by connecting the VPCC pin to IN.
For example, a system is designed with a 5.5V rated
DC power supply with ±0.5V tolerance. The worst
condition of 5V is selected, which is used to calculate
the VPCC supply voltage with divider.
Function
Voltage Proportional Charge
Control (VPCC)
SS
pin on the Printed Circuit
MCP73871
DS22090B-page 15
SS
. The EP