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

IC USB/AC BATT CHRGR W/PPM 20QFN

MCP73871-2CAI/ML

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

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
Features
• Integrated System Load Sharing and Battery
• Complete Linear Charge Management Controller
• Preset High Accuracy Charge Voltage Options:
• Constant Current / Constant Voltage (CC/CV)
• Maximum 1.8A Total Input Current Control
• Resistor Programmable Fast Charge Current
• Resistor Programmable Termination Set Point
• Selectable USB Input Current Control
• Automatic Recharge
• Automatic End-of-Charge Control
• Safety Timer With Timer Enable/Disable Control
• 0.1C Preconditioning for Deeply Depleted Cells
• Battery Cell Temperature Monitor
• Undervoltage Lockout (UVLO)
• Low Battery Status Indicator (LBO)
• Power-Good Status Indicator (PG)
• Charge Status and Fault Condition Indicators
• Numerous Selectable Options Available for a
• Temperature Range: -40°C to +85°C
• Packaging: 20-Lead QFN (4 mm x 4 mm)
© 2009 Microchip Technology Inc.
Stand-Alone System Load Sharing and Li-Ion / Li-Polymer
Charge Management
- Simultaneously Power the System and
- Voltage Proportional Current Control (VPCC)
- Low-Loss Power-Path Management with
- Integrated Pass Transistors
- Integrated Current Sense
- Integrated Reverse Discharge Protection
- Selectable Input Power Sources: USB Port or
- 4.10V, 4.20V, 4.35V or 4.40V
- ±0.5% Regulation Tolerance
Operation with Thermal Regulation
Control: 50 mA to 1A
- Absolute Maximum: 100 mA (L) / 500 mA (H)
Variety of Applications:
- Refer to Section 1.0 “Electrical
- Refer to the “Product Identification
Charge the Li-Ion Battery
ensures system load has priority over Li-Ion
battery charge current
Ideal Diode Operation
AC-DC Wall Adapter
Characteristics” for Selectable Options”
System” for Standard Options
Battery Charge Management Controller
Applications
• GPSs / Navigators
• PDAs and Smart Phones
• Portable Media Players and MP3 Players
• Digital Cameras
• Bluetooth Headsets
• Portable Medical Devices
• Charge Cradles / Docking Stations
• Toys
Description
The MCP73871 device is a fully integrated linear
solution for system load sharing and Li-Ion / Li-Polymer
battery charge management with ac-dc wall adapter
and USB port power sources selection. It’s also
capable of autonomous power source selection
between input or battery. Along with its small physical
size, the low number of required external components
makes
applications.
The MCP73871 device automatically obtains power for
the system load from a single-cell Li-Ion battery or an
input power source (ac-dc wall adapter or USB port).
The MCP73871 device specifically adheres to the
current drawn limits governed by the USB specification.
With an ac-dc wall adapter providing power to the
system, an external resistor sets the magnitude of 1A
maximum charge current while supports up to 1.8A
total current for system load and battery charge
current.
The MCP73871 device employs a constant current /
constant voltage (CC/CV) charge algorithm with
selectable charge termination point. The constant
voltage regulation is fixed with four available options:
4.10V, 4.20V, 4.35V, or 4.40V to accommodate new,
emerging
MCP73871 device also limits the charge current based
on die temperature during high power or high ambient
conditions. This thermal regulation optimizes the
charge cycle time while maintaining device reliability.
The MCP73871 device includes a low battery indicator,
a power-good indicator and two charge status
indicators that allows for outputs with LEDs or
communication
MCP73871 device is fully specified over the ambient
temperature range of -40°C to +85°C.
MCP73871
the
battery
device
with
charging
ideally
host
microcontrollers.
suited
requirements.
DS22090B-page 1
for
portable
The
The

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MCP73871-2CAI/ML Summary of contents

Page 1

... The MCP73871 device employs a constant current / constant voltage (CC/CV) charge algorithm with selectable charge termination point. The constant voltage regulation is fixed with four available options: 4 ...

Page 2

... Low Hi Low DS22090B-page 2 MCP73871 20-Lead QFN OUT BAT VPCC BAT EP SEL 3 13 PROG1 21 4 PROG3 MCP73871 Typical Application OUT 2 VPCC 14, 15 BAT 6 PG THERM 5 7 STAT2 8 STAT1 PROG1 R 13 LBO 3 SEL 4 12 PROG3 PROG2 10, 11 System Load 4.7 µF 4.7 µF NTC 10 kΩ ...

Page 3

... CHARGE CONTROL, HTVT TIMER, STAT2 AND + STATUS LOGIC TE LTVT + © 2009 Microchip Technology Inc. V REF - V /2 REF - V - REF PRECONDITION + V - REF - V REF V - REF V - REF V REF - - MCP73871 OUT 0.2Ω Ideal Diode, Synchronous Switch V BAT PROG1 PROG3 SEL PROG2 V BAT_SENSE 50 µA THERM DS22090B-page 3 ...

Page 4

... MCP73871 NOTES: DS22090B-page 4 © 2009 Microchip Technology Inc. ...

Page 5

... BAT BAT PSRR — -47 — — -40 — 100 110 REG 900 1000 1100 100 REG 400 450 500 MCP73871 + 0. -40°C to +85°C. A Units Conditions 6 V µA Charging µA Charge Complete µA Standby µA Shutdown (V < 100 BAT V < STOP ...

Page 6

... MCP73871 DC CHARACTERISTICS (CONTINUED) Electrical Specifications: Unless otherwise indicated, all limits apply for V Typical values are at +25° (typical) + 1.0V] IN REG Parameters Input Current Limit Control (ICLC) USB-Port Supply Current Limit AC-DC Adapter Current Limit Voltage Proportional Charge Control (VPCC - Input Voltage Regulation) ...

Page 7

... THERM V 1.20 1.24 1. — -40 — T1HYS V 0.23 0.25 0. — 40 — T2HYS T — 150 — — 10 — SDHYS MCP73871 = -40°C to +85°C. A Units Conditions kΩ kΩ µ PROG2 DD Note 1 V Note 1 V µ µ µ SEL DD µA 2 kΩ < R < 50 kΩ ...

Page 8

... MCP73871 AC CHARACTERISTICS Electrical Specifications: Unless otherwise indicated, all limits apply for V Typical values are at +25° REG Parameters UVLO Start Delay Current Regulation Transition Time Out of Precondition Current Rise Time Out of Precondition Precondition Comparator Filter Time Termination Comparator Filter Time Charge Comparator Filter Time ...

Page 9

... A DISCHARGE 35 5. 30.0 Temperature = +25°C 25.0 20.0 15.0 10.0 5.0 0.0 3.0 ) vs. FIGURE 2-6: OUT (I DISCHARGE (V ). BAT MCP73871 = +25°C, Constant-voltage mode. A Temperature = +25° 5.2V DD Charge Current (mA) Charge Current (I ) vs. OUT ). BAT = 4.2V BAT = Floating Temperature (°C) Output Leakage Current ) vs. Ambient Temperature (T ) ...

Page 10

... MCP73871 Note: Unless otherwise indicated 35 Floating DD 30.0 Temperature = +25°C 25.0 20.0 15.0 10.0 5.0 0.0 3.0 3.2 3.4 3.6 3.8 Battery Voltage (V) FIGURE 2-7: Output Leakage Current (I ) vs. Battery Voltage (V DISCHARGE 1190 kΩ 1160 PROG 1130 Temperature = +25°C 1100 1070 1040 ...

Page 11

... Supply Voltage (V 52.0 V 51.5 DD 51.0 50.5 50.0 49.5 49.0 48.5 48.0 47.5 47.0 125 150 -45 ) vs. FIGURE 2-18: OUT vs. Ambient Temperature (T MCP73871 = +25°C, Constant-voltage mode 5. kΩ 100 125 150 Ambient Temperature (°C) Charge Current (I ) vs. OUT ). J 4.8 5.0 5.2 5.4 5.6 5 ...

Page 12

... MCP73871 Note: Unless otherwise indicated OUT -10 -20 -30 -40 -50 -60 0.01 0 Frequency (kHz) FIGURE 2-19: Power Supply Ripple Rejection (PSRR 100 mA 8.5 OUT 8 7.5 7 6.5 6 5.5 5 4.5 -0.0008 -0.0006 -0.0004 -0.0002 0 Time (s) FIGURE 2-20: Line Transient Response 100 mA. OUT 500 mA 8.5 OUT 8 7 ...

Page 13

... PROG1 0 kΩ PROG3 0.6 0.4 0 Time (Minute) Complete Charge Cycle 2 1.8 1.6 1.4 Preconditioning Threshold Voltage 1.2 1 Fast Charge (Constant Current) 0.8 MCP73871 0 5. kΩ PROG1 kΩ 0.2 PROG3 0 0.2 0.4 0.6 0.8 1 Time (Minute) Typical Charge Profile in DS22090B-page 13 ...

Page 14

... MCP73871 NOTES: DS22090B-page 14 © 2009 Microchip Technology Inc. ...

Page 15

... SS 4.7 µF. 3.2 System Output Terminal (OUT) 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 ...

Page 16

... Power-Good (PG) The power-good (PG open-drain logic output for input power supply indication. The PG output is low whenever the input to the MCP73871 device is above the UVLO threshold and greater than the battery voltage. The PG output can be used as an indication to the user via an illuminated LED or to the system via a ...

Page 17

... Charge Enable (CE) With the CE input Low, the Li-Ion battery charger feature of the MCP73871 will be disabled. The charger feature is enabled when CE is active High. Allowing the CE pin to float during the charge cycle may cause system instability. The CE input is compatible with 1.8V logic. Refer to Section 6.0 “ ...

Page 18

... MCP73871 NOTES: DS22090B-page 18 © 2009 Microchip Technology Inc. ...

Page 19

... DEVICE OVERVIEW The MCP73871 device is a simple, but fully integrated linear charge management controllers with system load sharing feature. Figure 4-1 operational flow algorithm. TEMPERATURE FAULT No Charge Current STAT1 = LOW STAT2 = LOW PG = LOW Timer Suspended FIGURE 4-1: MCP73871 Device Flow Chart. ...

Page 20

... The preconditioning threshold is factory set. Refer to Section 1.0 “Electrical Characteristics” threshold options. In this mode, the MCP73871 device supplies 10% of the fast charge current (established with the value of the resistor connected to the PROG1 pin) to the battery. When the voltage at the V preconditioning threshold, the MCP73871 device enters the constant current (fast charge) mode ...

Page 21

... PROG I = milliampere (mA) REG The charge current is latched off and the MCP73871 device enters a charge complete mode. The recommended PROG3 resistor values are between 5 kΩ and 100 kΩ. 4.8 Automatic Recharge The MCP73871 device continuously monitors the voltage at the V pin in the charge complete mode ...

Page 22

... MCP73871 4.12 Voltage Proportional Charge Control (VPCC) 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, then the battery charging current is reduced. The VPCC control tries to reach a ...

Page 23

... USB specification. The host microcontroller has the option selecting either a 100 mA ( 500 mA (H) current limit based on the PROG2 input. With the SEL input High, the MCP73871 device limits the input current to 1.8A. The pins. An internal programmed charge current is established using a ...

Page 24

... However, there is a diode path back to the input, and as such, the output should only be pulled up to the input. The PG output is low whenever the input to the MCP73871 device is above the UVLO threshold and greater than the battery voltage. The PG output can be used as an indication to the system that an input source other than the battery is supplying power ...

Page 25

... APPLICATIONS The MCP73871 device is designed to operate in conjunction with a host microcontroller stand-alone applications. The MCP73871 device provides the preferred charge algorithm for Lithium-Ion 5V AC-DC Adapter or USB Port 18 µF 470Ω 470Ω 470Ω 330 kΩ Hi 110 kΩ Low Hi Low Hi Low ...

Page 26

... External Capacitors from the The MCP73871 device is stable with or without a battery load. In order to maintain good AC stability in the Constant Voltage mode, a minimum capacitance of 4.7 µF is recommended to bypass the V This capacitance provides compensation when there is no battery load. In addition, the battery and interconnections appear inductive at high frequencies ...

Page 27

... Due to the safety concerns when using Lithium-Ion batteries dissipation of linear solutions, the system load when design with the MCP73871 device is recommended to be less than 1A or the maximum discharge rate of the selected Lithium-Ion cell. Whichever is smaller is recommended. The idea diode between V and OUT is designed to BAT drive a maximum current ...

Page 28

... MCP73871 NOTES: DS22090B-page 28 © 2009 Microchip Technology Inc. ...

Page 29

... Package Marking Information 20-Lead QFN Part Number * XXXXX XXXXXX MCP73871-1AAI/ML XXXXXX YWWNNN MCP73871-1CAI/ML MCP73871-1CCI/ML MCP73871-2AAI/ML MCP73871-2CAI/ML MCP73871-2CCI/ML MCP73871-3CAI/ML MCP73871-3CCI/ML MCP73871-4CAI/ML MCP73871-4CCI/ML * Consult Factory for Alternative Device Options. Legend: XX...X Customer-specific information Y Year code (last digit of calendar year) YY Year code (last 2 digits of calendar year) WW Week code (week of January 1 is week ‘ ...

Page 30

... MCP73871 /HDG 3ODVWLF 4XDG )ODW 1R /HDG 3DFNDJH 0/ ± 1RWH 1RWHV DS22090B-page 30 PP %RG\ >4)1@ © 2009 Microchip Technology Inc. ...

Page 31

... Microchip Technology Inc. MCP73871 DS22090B-page 31 ...

Page 32

... MCP73871 NOTES: DS22090B-page 32 © 2009 Microchip Technology Inc. ...

Page 33

... Revision B (May 2009) The following is the list of modifications: 1. Updated the QFN-20 package drawing. 2. Updated Equation 4-1. Updated Section 4.7 “Charge Termination” 3. and Equation 4-2. 4. Updated Equation 5-1. Revision A (July 2008) • Original Release of this Document. © 2009 Microchip Technology Inc. MCP73871 DS22090B-page 33 ...

Page 34

... MCP73871 NOTES: DS22090B-page 34 © 2009 Microchip Technology Inc. ...

Page 35

... Consult Factory for Alternative Device Options. © 2009 Microchip Technology Inc. MCP73871 . Examples MCP73871-1AAI/ML: b) MCP73871-1CAI/ML: c) MCP73871-1CCI/ML: d) MCP73871-2AAI/ML: e) MCP73871-2CAI/ML: f) MCP73871-2CCI/ML: g) MCP73871-3CAI/ML: h) MCP73871-3CCI/ML Consult Factory for Alternative Device Options Safety Timer LBO Voltage Duration (Hours) Threshold (V) Disable 6 6 Disable 6 6 ...

Page 36

... MCP73871 NOTES: DS22090B-page 36 © 2009 Microchip Technology Inc. ...

Page 37

... PowerInfo, PowerMate, PowerTool, REAL ICE, rfLAB, Select Mode, Total Endurance, TSHARC, WiperLock and ZENA are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. SQTP is a service mark of Microchip Technology Incorporated in the U.S.A. All other trademarks mentioned herein are property of their respective companies. ...

Page 38

... Fax: 886-3-6578-370 Taiwan - Kaohsiung Tel: 886-7-536-4818 Fax: 886-7-536-4803 Taiwan - Taipei Tel: 886-2-2500-6610 Fax: 886-2-2508-0102 Thailand - Bangkok Tel: 66-2-694-1351 Fax: 66-2-694-1350 © 2009 Microchip Technology Inc. EUROPE Austria - Wels Tel: 43-7242-2244-39 Fax: 43-7242-2244-393 Denmark - Copenhagen Tel: 45-4450-2828 Fax: 45-4485-2829 France - Paris Tel: 33-1-69-53-63-20 ...

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