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 2005-2013 Microchip Technology Inc. DS20001984F-page 1

MCP73831/2

Features

• Linear Charge Management Controller:

- Integrated Pass Transistor

- Integrated Current Sense

- Reverse Discharge Protection

• High Accuracy Preset Voltage Regulation: +

0.75%

• Four Voltage Regulation Options:

- 4.20V, 4.35V, 4.40V, 4.50V

• Programmable Charge Current: 15 mA to 500 mA

• Selectable Preconditioning:

- 10%, 20%, 40%, or Disable

• Selectable End-of-Charge Control:

- 5%, 7.5%, 10%, or 20%

• Charge Status Output

- Tri-State Output - MCP73831

- Open-Drain Output - MCP73832

• Automatic Power-Down

• Thermal Regulation

• Temperature Range: -40°C to +85°C

• Packaging:

- 8-Lead, 2 mm x 3 mm DFN

- 5-Lead, SOT-23

Applications

• Lithium-Ion/Lithium-Polymer Battery Chargers

• Personal Data Assistants

• Cellular Telephones

• Digital Cameras

• MP3 Players

• Bluetooth Headsets

• USB Chargers

Typical Application

Description:

The MCP73831/2 devices are highly advanced linear

charge management controllers for use in space-

limited, cost-sensitive applications. The MCP73831/2

are available in an 8-Lead, 2 mm x 3 mm DFN package

or a 5-Lead, SOT-23 package. Along with their small

physical size, the low number of external components

required make the MCP73831/2 ideally suited for

portable applications. For applications charging from a

USB port, the MCP73831/2 adhere to all the

specifications governing the USB power bus.

The MCP73831/2 employ a constant-current/constant-

voltage charge algorithm with selectable

preconditioning and charge termination. The constant

voltage regulation is fixed with four available options:

4.20V, 4.35V, 4.40V or 4.50V, to accommodate new,

emerging battery charging requirements. The constant

current value is set with one external resistor. The

MCP73831/2 devices limit 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.

Several options are available for the preconditioning

threshold, preconditioning current value, charge

termination value and automatic recharge threshold.

The preconditioning value and charge termination

value are set as a ratio or percentage of the

programmed constant current value. Preconditioning

can be disabled. Refer to Section 1.0 “Electrical

Characteristics” for available options and the

Product Identification System for standard options.

The MCP73831/2 devices are fully specified over the

ambient temperature range of -40°C to +85°C.

Package Types

STAT

PROG

BAT

Single

Li-Ion

Cell

MCP73831

500 mA Li-Ion Battery Charger

4.7 μF

470Ω

2kΩ

4.7 μF

BAT

PROG

STAT

MCP73831/2

2×3 DFN*

BAT

STAT

PROGV

* Includes Exposed Thermal Pad (EP); see Tab le 3- 1.

MCP73831/2

SOT-23-5

Miniature Single-Cell, Fully Integrated Li-Ion,

Li-Polymer Charge Management Controllers

Summary of content (30 pages)

PAGE 1
MCP73831/2 Miniature Single-Cell, Fully Integrated Li-Ion, Li-Polymer Charge Management Controllers Features Description: • Linear Charge Management Controller: - Integrated Pass Transistor - Integrated Current Sense - Reverse Discharge Protection • High Accuracy Preset Voltage Regulation: + 0.75% • Four Voltage Regulation Options: - 4.20V, 4.35V, 4.40V, 4.
PAGE 2
MCP73831/2 Functional Block Diagram VDD 6 µA DIRECTION CONTROL VBAT G=0.001 6 µA PROG 0.5 µA + - REFERENCE GENERATOR CA MCP73831 ONLY 43.6 kΩ VREF(1.22V) 361 kΩ 89 kΩ VDD 3.9 kΩ + - PRECONDITION 182.3 kΩ 111 kΩ 7 kΩ 190 kΩ + TERMINATION + CHARGE 15 kΩ STAT + - VA 111 kΩ + - 0.5 µA VBAT 477 kΩ VSS 255 kΩ DS20001984F-page 2 100 kΩ SHDN + - DIRECTION CONTROL + - UVLO  2005-2013 Microchip Technology Inc.
PAGE 3
MCP73831/2 1.0 ELECTRICAL CHARACTERISTICS † Notice: Stresses above those listed under “Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operational listings of this specification is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability. Absolute Maximum Ratings† VDD.......................................................
PAGE 4
MCP73831/2 DC CHARACTERISTICS (CONTINUED) Electrical Specifications: Unless otherwise indicated, all limits apply for VDD= [VREG(typical) + 0.3V] to 6V, TA = -40°C to +85°C. Typical values are at +25°C, VDD = [VREG (typical) + 1.0V] Parameters Sym. Min. Typ. Max. Units Conditions Preconditioning Current Regulation (Trickle Charge Constant-Current Mode) Precondition Current Ratio IPREG / IREG 7.5 10 12.5 % PROG = 2.0 kΩ to 10 kΩ 15 20 25 % PROG = 2.0 kΩ to 10 kΩ 30 40 50 % PROG = 2.
PAGE 5
MCP73831/2 DC CHARACTERISTICS (CONTINUED) Electrical Specifications: Unless otherwise indicated, all limits apply for VDD= [VREG(typical) + 0.3V] to 6V, TA = -40°C to +85°C. Typical values are at +25°C, VDD = [VREG (typical) + 1.0V] Parameters Sym. Min. Typ. Max. VPDEXIT — VDD<(VBAT +150 mV) VDD<(VBAT +200 mV) Die Temperature TSD — 150 — °C Die Temperature Hysteresis TSDHYS — 10 — °C Automatic Power Down Exit Threshold Units Conditions 3.
PAGE 6
MCP73831/2 NOTES: DS20001984F-page 6  2005-2013 Microchip Technology Inc.
PAGE 7
MCP73831/2 2.0 TYPICAL PERFORMANCE CURVES Note: The graphs and tables provided following this note are a statistical summary based on a limited number of samples and are provided for informational purposes only. The performance characteristics listed herein are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified operating range (e.g., outside specified power supply range) and therefore outside the warranted range. 4.210 MCP73831-2 4.205 IOUT = 10 mA 4.
PAGE 8
MCP73831/2 TYPICAL PERFORMANCE CURVES (CONTINUED) Note: Unless otherwise indicated, VDD = [VREG(typical) + 1V], IOUT = 10 mA and TA= +25°C, Constant-Voltage mode. 525 RPROG = 10 kΩ 103 Charge Current (mA) 102 101 100 99 98 97 RPROG = 2 kΩ 450 375 300 225 150 75 0 -10 Attenuation (dB) 512 510 508 506 504 80 70 60 50 40 30 20 0 10 -10 -20 -30 0.1 FIGURE 2-8: Charge Current (IOUT) vs. Ambient Temperature (TA).
PAGE 9
MCP73831/2 TYPICAL PERFORMANCE CURVES (CONTINUED) 1.40 0.10 0.05 1.20 0.05 10 0.00 1.00 0.00 8 -0.05 0.80 -0.05 6 -0.10 0.60 -0.10 4 -0.15 0.40 -0.15 2 -0.20 0.20 -0.20 0 200 180 160 -0.08 -0.10 COUT = 4.7 µF, X7R Ceramic 200 180 160 140 120 100 80 60 40 20 -0.12 0 -0.05 Time (µs) FIGURE 2-15: Load Transient Response.  2005-2013 Microchip Technology Inc. 200 180 160 140 120 80 300 2.0 200 MCP73831-2AC/IOT VDD = 5.2V RPROG = 2 kΩ 1.0 100 0.
PAGE 10
MCP73831/2 NOTES: DS20001984F-page 10  2005-2013 Microchip Technology Inc.
PAGE 11
MCP73831/2 3.0 PIN DESCRIPTION The descriptions of the pins are listed in Table 3-1. TABLE 3-1: PIN FUNCTION TABLES Pin No. DFN 3.
PAGE 12
MCP73831/2 NOTES: DS20001984F-page 12  2005-2013 Microchip Technology Inc.
PAGE 13
MCP73831/2 4.0 DEVICE OVERVIEW The MCP73831/2 are highly advanced linear charge management controllers. Figure 4-1 depicts the operational flow algorithm from charge initiation to completion and automatic recharge. The UVLO circuit is always active. Whenever the input supply is below the UVLO threshold or within +50 mV of the voltage at the VBAT pin, the MCP73831/2 are placed in Shutdown mode.
PAGE 14
MCP73831/2 300 225 150 75 155 145 135 125 115 95 105 85 0 Charge Termination The charge cycle is terminated when, during ConstantVoltage mode, the average charge current diminishes below a percentage of the programmed charge current (established with the value of the resistor connected to the PROG pin). A 1 ms filter time on the termination comparator ensures that transient load conditions do not result in premature charge cycle termination. The percentage or ratio of the current is factory set.
PAGE 15
MCP73831/2 5.0 DETAILED DESCRIPTION 5.2 5.1 Analog Circuitry 5.2.1 5.1.1 BATTERY MANAGEMENT INPUT SUPPLY (VDD) The VDD pin is the input supply pin for the MCP73831/ 2 devices. The MCP73831/2 automatically enter a Power-Down mode if the voltage on the VDD input falls below the UVLO voltage (VSTOP). This feature prevents draining the battery pack when the VDD supply is not present. 5.1.
PAGE 16
MCP73831/2 NOTES: DS20001984F-page 16  2005-2013 Microchip Technology Inc.
PAGE 17
MCP73831/2 6.0 APPLICATIONS followed by a constant voltage charging method. Figure 6-1 depicts a typical stand-alone application circuit, while Figure 6-2 and Figure 6-3 depict the accompanying charge profile. The MCP73831/2 are designed to operate in conjunction with a host microcontroller or in a standalone application. The MCP73831/2 provide the preferred charge algorithm for Lithium-Ion and LithiumPolymer cells.
PAGE 18
MCP73831/2 6.1.1.2 Thermal Considerations 6.1.1.5 The worst-case power dissipation in the battery charger occurs when the input voltage is at the maximum and the device has transitioned from the Preconditioning mode to the Constant-Current mode.
PAGE 19
MCP73831/2 7.0 PACKAGING INFORMATION 7.1 Package Marking Information 8-Lead DFN (2x3x0.
PAGE 20
MCP73831/2 /HDG 3ODVWLF 'XDO )ODW 1R /HDG 3DFNDJH 0& ± [ [ PP %RG\ >')1@ 1RWH 4 % & % ! % * %% 255))) & &5 " ) * ' % * $ % % " % e D b N N L K E2 E EXPOSED PAD NOTE 1 NOTE 1 2 1 2 1 D2 BOTTOM VIEW TOP VIEW A A3 A1 NOTE 2 6 % & 9 & % :!&( $ 99 , , : : :; < = % . / 0 ; > % = % " $$ .
PAGE 21
MCP73831/2 Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging  2005-2013 Microchip Technology Inc.
PAGE 22
MCP73831/2 /HDG 3ODVWLF 6PDOO 2XWOLQH 7UDQVLVWRU 27 >627 @ 1RWH 4 % & % ! % * %% 255))) & &5 " ) * ' % * $ % % " % b N E E1 3 2 1 e e1 D A2 A c φ A1 L L1 6 % & 9 & % :!&( $ 9 99 , , : : < . " % ;!% " 9 :; . / 0 " % ; > % " " * * % " $$ ; ? "% " " * ; 9 % ? "% / 0 @ = @ .
PAGE 23
MCP73831/2 Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging  2005-2013 Microchip Technology Inc.
PAGE 24
MCP73831/2 NOTES: DS20001984F-page 24  2005-2013 Microchip Technology Inc.
PAGE 25
MCP73831/2 APPENDIX A: REVISION HISTORY Revision F (June 2013) The following is the list of modifications: 1. 2. 3. 4. Updated the Functional Block Diagram. Added the Battery Detection parameter and related information in the DC Characteristics table. Added new section Section 4.2 “Battery Detection”. Minor grammatical and spelling corrections. Revision E (September 2008) The following is the list of modifications: 1. 2. 3. 4. 5. 6. 7. 8. Package Types: Changed DFN pinout diagram. Section 1.
PAGE 26
MCP73831/2 NOTES: DS20001984F-page 26  2005-2013 Microchip Technology Inc.
PAGE 27
MCP73831/2 PRODUCT IDENTIFICATION SYSTEM To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office. PART NO. X XX Examples: * /XX X a) Device VREG Options Temperature Package Range b) c) Device: MCP73831: MCP73831T: Single-Cell Charge Controller Single-Cell Charge Controller (Tape and Reel) Single-Cell Charge Controller Single-Cell Charge Controller (Tape and Reel) MCP73832 MCP73832T: Regulation Voltage: Code VREG 2 3 4 5 4.20V 4.35V 4.
PAGE 28
MCP73831/2 NOTES: DS20001984F-page 28  2005-2013 Microchip Technology Inc.
PAGE 29
Note the following details of the code protection feature on Microchip devices: • Microchip products meet the specification contained in their particular Microchip Data Sheet. • Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions. • There are dishonest and possibly illegal methods used to breach the code protection feature.
PAGE 30
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