Datasheet

ManualsBrandsMICROCHIP TECHNOLOGY ManualsPMICsPMIC - battery management Charge management Li-Ion, Li-Po SOT 23 5 Surface-mount

MCP73811/2

Features

• Complete Linear Charge Management Controller

- Integrated Pass Transistor

- Integrated Current Sense

- Integrated Reverse Discharge Protection

• Constant Current / Constant Voltage Operation

with Thermal Regulation

• High Accuracy Preset Voltage Regulation: +

• Voltage Regulation: 4.20V

• Selectable Charge Current:

- MCP73811: 85 mA / 450 mA

• Programmable Charge Current:

- MCP73812: 50 mA - 500 mA

• Minimum External Components Required:

- MCP73811: 2 Ceramic Capacitors

- MCP73812: 2 Ceramic Capacitors and

1 Resistor

• No Preconditioning

• External End-of-Charge Control

• Automatic Power-Down when Input Power

Removed

• Active High Charge Enable

• Temperature Range:

- -40°C to +85°C

• Packaging:

- 5-Lead SOT-23

Applications

• Low-Cost Lithium-Ion/Lithium-Polymer Battery

Chargers

• Rechargeable Toys

• Electronic Cigarettes

• Bluetooth Headsets

• USB Chargers

Description

The MCP73811/2 devices are linear charge manage-

ment controllers that are designed for use in space

limited and cost sensitive applications. The

MCP73811/2 provide specific charge algorithms for

single cell Li-Ion or Li-Polymer battery to achieve

optimal capacity in the shortest charging time possible.

Along with its small physical size, the low number of

external components required make the MCP73811/2

ideally suited for portable applications. For applications

charging from a USB port, the MCP73811 adheres to

all the specifications governing the USB power bus.

The MCP73811/2 employ a constant current/constant

voltage charge algorithm. The constant voltage regula-

tion is fixed at 4.20V, with a tight regulation tolerance of

1%. For the MCP73811, the constant current value is

selected as 85 mA (low power USB port) or 450 mA

(high power USB port) with a digital input signal on the

PROG input. For the MCP73812, the constant current

value is set with one external resistor. The

MCP73811/2 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.

The MCP73811/2 are fully specified over the ambient

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

MCP73811/2 are available in a 5-Lead, SOT-23

package.

Package Types

BAT

5-Pin SOT-23

PROG

Simple, Miniature Single-Cell, Fully Integrate d

Li-Ion / Li-Polymer Charge Management Controllers

Summary of content (22 pages)

PAGE 1
MCP73811/2 Simple, Miniature Single-Cell, Fully Integrated Li-Ion / Li-Polymer Charge Management Controllers Features Description • Complete Linear Charge Management Controller - Integrated Pass Transistor - Integrated Current Sense - Integrated Reverse Discharge Protection • Constant Current / Constant Voltage Operation with Thermal Regulation • High Accuracy Preset Voltage Regulation: + 1% • Voltage Regulation: 4.
PAGE 2
MCP73811/2 Typical Applications 450 mA Li-Ion Battery Charger VIN 1 µF 4 5 1 VBAT 3 1 µF VDD 500 mA Li-Ion Battery Charger 4 V DD VIN 1 µF + Single Li-Ion - Cell PROG PROG VSS 2 CE VBAT 3 1 µF 1 CE MCP73811 + Single Li-Ion - Cell 5 VSS 2 2 kΩ MCP73812 Functional Block Diagram Direction Control VDD VBAT 6µA G=0.001 MCP73812 MCP73811 + CA - 2.7 kΩ PROG 12 kΩ 388.7 kΩ + Reference Generator VA 111 kΩ Direction Control VREF (1.21V) 157.
PAGE 3
MCP73811/2 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† VDDN .....................................................
PAGE 4
MCP73811/2 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 Charge Enable (CE), PROG Input - MCP73811 Input High Voltage Level VIH 2 — — V Input Low Voltage Level VIL — — 0.8 V Input Leakage Current ILK — 0.
PAGE 5
MCP73811/2 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 4.
PAGE 6
MCP73811/2 Typical Performance Curves (Continued) Note: Unless otherwise indicated, VDD = [VREG(typ.) + 1V], IOUT = 10 mA and TA= +25°C, Constant-voltage mode. 516 PROG = High VDD = 5V 470 Charge Current (mA) 460 450 440 430 420 410 RPROG = 2 kΩ 514 512 510 508 506 504 502 500 4.50 400 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 4.75 5.00 5.50 5.75 6.00 FIGURE 2-10: Charge Current (IOUT) vs. Supply Voltage (VDD) - MCP73812.
PAGE 7
MCP73811/2 Typical Performance Curves (Continued) Note: Unless otherwise indicated, VDD = [VREG(typ.) + 1V], IOUT = 10 mA and TA= +25°C, Constant-voltage mode. 0 RPROG = 10 kΩ -10 90 75 60 45 30 15 -30 -40 -50 -60 0.01 155 145 135 0.1 -0.05 6 -0.10 4 -0.15 2 0 -50 80 0.10 12 0.05 10 0.00 8 -0.05 6 -0.10 4 -0.15 2 0 © 2007 Microchip Technology Inc. 100 -0.25 -0.30 Time (µs) Frequency (kHz) FIGURE 2-15: Power Supply Ripple Rejection (PSRR).
PAGE 8
MCP73811/2 Typical Performance Curves (Continued) Time (µs) 1.40 0.10 1.20 0.05 1.00 0.00 0.80 -0.05 0.60 -0.10 0.40 -0.15 -0.20 COUT = 4.7 µF, X7R Ceramic 0.00 0 Time (Minutes) Load Transient Response. 0.20 0.0 FIGURE 2-21: Typical Charge Profile (950 mAh) Li-Ion Battery. Output Ripple (V) Output Current (A) FIGURE 2-19: 100 0 200 180 160 140 120 80 100 60 40 0 -0.12 20 -0.05 200 180 -0.10 300 1.0 165 COUT = 4.7 µF, X7R Ceramic 0.00 2.0 150 -0.08 135 -0.
PAGE 9
MCP73811/2 3.0 PIN DESCRIPTION The descriptions of the pins are listed in Table 3-1. TABLE 3-1: Pin Number SOT-23-5 1 3.1 PIN FUNCTION TABLES Symbol Function CE Active High Charge Enable 2 VSS Battery Management 0V Reference 3 VBAT Battery Charge Control Output 4 VDD Battery Management Input Supply 5 PROG Current Regulation Set and Charge Control Enable Charge Enable Input (CE) 3.4 Battery Management Input Supply (VDD) A logic High enables battery charging.
PAGE 10
MCP73811/2 4.0 DEVICE OVERVIEW The MCP73811/2 are simple, but fully integrated linear charge management controllers. Figure 4-1 depicts the operational flow algorithm. 4.3 PRECONDITIONING The MCP73811/2 does not support preconditioning of deeply depleted cells. 4.4 SHUTDOWN MODE* VDD < VPD Constant Current MODE - Fast Charge During the constant current mode, the selected (MCP73811) or programmed (MCP73812) charge current is supplied to the battery or load.
PAGE 11
MCP73811/2 4.8 Thermal Regulation 4.9 The MCP73811/2 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 MCP73811/2. . Charge Current (mA) 525 Thermal Shutdown The MCP73811/2 suspends charge if the die temperature exceeds 150°C. Charging will resume when the die temperature has cooled by approximately 10°C.
PAGE 12
MCP73811/2 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 MCP73811/2. The MCP73811/2 automatically enters a Power-down mode if the voltage on the VDD input falls to within +50 mV of the battery voltage. This feature prevents draining the battery pack when the VDD supply is not present. 5.1.
PAGE 13
MCP73811/2 6.0 APPLICATIONS charge algorithm for Lithium-Ion and Lithium-Polymer cells Constant-current followed by Constant-voltage. Figure 6-1 depicts a typical stand-alone application circuit, while Figures 6-2 depict the accompanying charge profile. The MCP73811/2 is designed to operate in conjunction with a host microcontroller or in stand-alone applications.
PAGE 14
MCP73811/2 6.1.1.2 Thermal Considerations 6.1.1.4 Reverse-Blocking Protection 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. In this case, the power dissipation is: The MCP73811/2 provides protection from a faulted or shorted input.
PAGE 15
MCP73811/2 7.0 PACKAGE INFORMATION 7.1 Package Marking Information 5-Pin SOT-23 Example: Standard * XXNN Part Number MCP73811T-420I/OT MCP73812T-420I/OT 1 KSNN Code KSNN KWNN 1 * Custom output voltages available upon request. Contact your local Microchip sales office for more information. Legend: XX...
PAGE 16
MCP73811/2 5-Lead Plastic Small Outline Transistor (OT) [SOT-23] Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging b N E E1 3 2 1 e e1 D A2 A c φ A1 L L1 Units Dimension Limits Number of Pins MILLIMETERS MIN NOM MAX N 5 Lead Pitch e 0.95 BSC Outside Lead Pitch e1 Overall Height A 0.90 – Molded Package Thickness A2 0.89 – 1.30 Standoff A1 0.00 – 0.15 Overall Width E 2.20 – 3.
PAGE 17
MCP73811/2 APPENDIX A: REVISION HISTORY Revision B (September 2007) The following is the list of modifications: 1. 2. 3. 4. 5. 6. 7. Modified “No End-of-Charge Control” bullet to read “External End-of-Charge Control”. Deleted No Undervoltage Lockout (UVLO) bullet Replaced Figure 2-21 with new plot and changed figure caption. Deleted Figure 2-22. Replaced Figure 6-2 with new plot and changed figure caption. Deleted Figure 6-3. Updated revision history.
PAGE 19
MCP73811/2 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. — XXX Device Device: Voltage Options *: X /XX Voltage Temperature Package Options MCP73811T: Li-Ion Charger w/Selectable Charge Current, Tape and Reel MCP73812T: Li-Ion Charger w/Selectable Charge Current, Tape and Reel Examples: a) MCP73811T-420I/OT: 4.2V Charger SOT-23-5 pkg. a) MCP73812T-420I/OT: 4.2V Charger SOT-23-5 pkg. 420 = 4.
PAGE 21
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 22
WORLDWIDE SALES AND SERVICE AMERICAS ASIA/PACIFIC ASIA/PACIFIC EUROPE Corporate Office 2355 West Chandler Blvd. Chandler, AZ 85224-6199 Tel: 480-792-7200 Fax: 480-792-7277 Technical Support: http://support.microchip.com Web Address: www.microchip.