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MCP73831

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

• Selectable Preconditioning

• Selectable End-of-Charge Control

• Charge Status Output

• Automatic Power-Down

• Thermal Regulation

• Temperature Range: -40°C to +85°C

• Packaging:

- 8-Lead, 2 mm x 3 mm DFN

- 5-Lead, SOT23

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 is a highly advanced linear charge

management controller for use in space-limited, cost

sensitive applications. The MCP73831 is available in

an 8-Lead, 2 mm x 3 mm DFN package or a 5-Lead,

SOT23 package. Along with its small physical size, the

low number of external components required makes

the MCP73831 ideally suited for portable applications.

For applications charging from a USB port, the

MCP73831 adheres to all the specifications governing

the USB power bus.

The MCP73831 employs a constant-current/constant-

voltage charge algorithm with selectable precondition-

ing and charge termination. The constant voltage regu-

lation is fixed with four available options: 4.20V, 4.35V,

4.40V, or 4.50V, to accommodate new, emerging bat-

tery charging requirements. The constant current value

is set with one external resistor. The MCP73831 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.

Several options are available for the preconditioning

threshold, preconditioning current value, charge termi-

nation value, and automatic recharge threshold. The

preconditioning value and charge termination value are

set as a ratio, or percentage, of the programmed con-

stant 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 is 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

SOT23-5

BAT

PROG

STAT

8-Lead DFN

BAT

PROG

STAT

(2 mm x 3 mm)

Miniature Single Cell, Fully Integrated Li-Ion,

Li-Polymer Charge Management Controller

Summary of content (24 pages)

PAGE 1
MCP73831 Miniature Single Cell, Fully Integrated Li-Ion, Li-Polymer Charge Management Controller 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 Functional Block Diagram VDD 6 μA DIRECTION CONTROL VBAT 6 μA PROG G=0.001 0.5 μA + REFERENCE GENERATOR CA 43.6 kΩ VREF(1.22V) 361 kΩ 89 kΩ 3.9 kΩ + - PRECONDITION 182.3 kΩ 111 kΩ + 7 kΩ 15 kΩ STAT TERMINATION + CHARGE + - VA 190 kΩ 111 kΩ 0.5 μA VBAT + - SHDN + DIRECTION CONTROL - 477 kΩ VSS 255 kΩ DS21984A-page 2 100 kΩ + - UVLO © 2005 Microchip Technology Inc.
PAGE 3
MCP73831 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† VDDN .......................................................
PAGE 4
MCP73831 DC CHARACTERISTICS (CONTINUED) Electrical Specifications: Unless otherwise indicated, all limits apply for VDD= [VREG(typ.) + 0.3V] to 6V, TA = -40°C to +85°C. Typical values are at +25°C, VDD = [VREG (typ.) + 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 PROG = 2.0 kΩ to 10 kΩ 15 20 25 % 30 40 50 % PROG = 2.
PAGE 5
MCP73831 AC CHARACTERISTICS Electrical Specifications: Unless otherwise indicated, all limits apply for VDD = [VREG (typ.) + 0.3V] to 12V, TA = -40°C to +85°C. Typical values are at +25°C, VDD = [VREG (typ.) + 1.0V] Parameters Sym. Min. Typ. Max. Units tSTART — — 5 ms VDD Low-to-High tDELAY — — 1 ms VBAT < VPTH to VBAT > VPTH Current Rise Time Out of Preconditioning tRISE — — 1 ms IOUT Rising to 90% of IREG Termination Comparator Filter tTERM 0.4 1.3 3.
PAGE 6
MCP73831 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.
PAGE 7
MCP73831 TYPICAL PERFORMANCE CURVES (CONTINUED) NOTE: Unless otherwise indicated, VDD = [VREG(typ.) + 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 -10 512 Attenuation (dB) Charge Current (mA) 510 508 506 504 155 145 135 125 115 95 105 85 VAC = 100 mVp-p IOUT = 10 mA P, X7R Ceramic COUT = 4.7 F -20 -30 -40 -50 502 -60 0.
PAGE 8
MCP73831 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 0.0 0 200 180 160 140 Time (s) FIGURE 2-17: Complete Charge Cycle (180 mAh Li-Ion Battery). 6.0 600 0.30 0.02 5.0 500 0.25 0.00 0.20 -0.02 4.0 400 0.15 -0.04 3.0 300 0.10 -0.06 0.05 -0.08 Time (µs) FIGURE 2-15: DS21984A-page 8 Load Transient Response. 200 MCP73831-2AC/IOT VDD = 5.2V 1.
PAGE 9
MCP73831 3.0 PIN DESCRIPTION The descriptions of the pins are listed in Table 3-1. TABLE 3-1: PIN FUNCTION TABLES Pin No. Symbol DFN SOT23-5 1 4 2 3 3.
PAGE 10
MCP73831 4.0 DEVICE OVERVIEW The MCP73831 is a highly advanced linear charge management controller. Figure 4-1 depicts the operational flow algorithm from charge initiation to completion and automatic recharge. The UVLO circuit is always active. At any time the input supply is below the UVLO threshold or within 50 mV of the voltage at the VBAT pin, the MCP73831 is placed in a Shutdown mode.
PAGE 11
MCP73831 Constant-Voltage Mode When the voltage at the VBAT pin reaches the regulation voltage, VREG, constant voltage regulation begins. The regulation voltage is factory set to 4.2V, 4.35V, 4.40V, or 4.50V with a tolerance of ±0.75%. Thermal Regulation The MCP73831 limits the charge current based on the die temperature. The thermal regulation optimizes the charge cycle time while maintaining device reliability. Figure 4-2 depicts the thermal regulation for the MCP73831.
PAGE 12
MCP73831 5.0 DETAILED DESCRIPTION 5.2 5.1 Analog Circuitry 5.2.1 5.1.1 BATTERY MANAGEMENT INPUT SUPPLY (VDD) The VDD input is the input supply to the MCP73831. The MCP73831 automatically enters 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 13
MCP73831 6.0 APPLICATIONS constant current followed by constant voltage. Figure 6-1 depicts a typical stand-alone application circuit, while Figures 6-2 and 6-3 depict the accompanying charge profile. The MCP73831 is designed to operate in conjunction with a host microcontroller or in a stand-alone application.
PAGE 14
MCP73831 PowerDissipation = ( V DDMAX –V PTHMIN )×I REGMAX Where: VDDMAX = the maximum input voltage IREGMAX = the maximum fast charge current VPTHMIN = the minimum transition threshold voltage Power dissipation with a 5V, ±10% input voltage source is: PowerDissipation = ( 5.5V – 2.7V ) × 550mA = 1.54W This power dissipation with the battery charger in the SOT23-5 package will cause thermal regulation to be entered as depicted in Figure 6-3.
PAGE 15
MCP73831 7.0 PACKAGING INFORMATION 7.
PAGE 16
MCP73831 8-Lead Plastic Dual-Flat, No-Lead Package (MC) 2x3x0.9 mm Body (DFN) – Saw Singulated b D p n L K E2 E EXPOSED METAL PAD (NOTE 2) PIN 1 ID INDEX AREA (NOTE 1) 2 DETAIL ALTERNATE CONTACT CONFIGURATION TOP VIEW A1 Units n MILLIMETERS* INCHES MIN Number of Pins BOTTOM VIEW EXPOSED TIE BAR (NOTE 3) A A3 Dimension Limits 1 D2 NOM MAX MIN MAX NOM 8 8 Pitch e Overall Height A .031 .035 .039 0.80 0.90 1.00 Standoff A1 .000 .001 .002 0.00 0.02 0.
PAGE 17
MCP73831 5-Lead Plastic Small Outline Transistor (OT) (SOT-23) E E1 p B p1 n D 1 α c A φ L β A1 INCHES* Units Dimension Limits MIN MILLIMETERS NOM MAX Pitch n p .038 Outside lead pitch (basic) p1 .075 Number of Pins Overall Height A2 MIN NOM 5 MAX 5 0.95 1.90 A .035 .046 .057 0.90 1.18 1.45 Molded Package Thickness A2 .035 .043 .051 0.90 1.10 1.30 Standoff A1 .000 .003 .006 0.00 0.08 0.15 Overall Width E .102 .110 .118 2.60 2.80 3.
PAGE 19
MCP73831 APPENDIX A: REVISION HISTORY Revision A (November 2005) • Original Release of this Document. © 2005 Microchip Technology Inc.
PAGE 21
MCP73831 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: MCP73831T: Regulation Voltage: Code VREG 2 3 4 5 4.20V 4.35V 4.40V 4.50V Options: * Single-Cell Charge Controller (Tape and Reel) d) a) b) = = = = Code AC AD AT DC c) d) IPREG/IREG VPTH/VREG ITERM/IREG VRTH/VREG 10 10 10 100 66.5 66.
PAGE 23
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 24
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