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MCP73833/4

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:

- 4.2V, 4.35V, 4.4V, or 4.5V, +

0.75%

• Programmable Charge Current: 1A Maximum

• Preconditioning of Deeply Depleted Cells

- Selectable Current Ratio

- Selectable Voltage Threshold

• Automatic End-of-Charge Control

- Selectable Current Threshold

- Selectable Safety Time Period

• Automatic Recharge

- Selectable Voltage Threshold

• Two Charge Status Outputs

• Cell Temperature Monitor

• Low-Dropout Linear Regulator Mode

• Automatic Power-Down when Input Power

Removed

• Under Voltage Lockout

• Numerous Selectable Options Available for a

Variety of Applications:

- Refer to Section 1.0 “Electrical

Characteristics” for Selectable Options

- Refer to the Product Identification System for

Standard Options

• Available Packages:

- DFN-10 (3 mm x 3 mm)

- MSOP-10

Applications

• Lithium-Ion / Lithium-Polymer Battery Chargers

• Personal Data Assistants

• Cellular Telephones

• Digital Cameras

• MP3 Players

• Bluetooth Headsets

• USB Chargers

Description

The MCP73833/4 is a highly advanced linear charge

management controller for use in space-limited, cost

sensitive applications. The MCP73833/4 is available in

a 10-Lead, 3 mm x 3 mm DFN package or a 10-Lead,

MSOP package. Along with its small physical size, the

low number of external components required makes

the MCP73833/4 ideally suited for portable

applications. For applications charging from a USB

port, the MCP73833/4 can adhere to all the

specifications governing the USB power bus.

The MCP73833/4 employs a constant current/constant

voltage charge algorithm with selectable precondition-

ing and charge termination. The constant voltage

regulation is fixed with four available options: 4.20V,

4.35V, 4.40V, or 4.50V, to accomodate new, emerging

battery charging requirements. The constant current

value is set with one external resistor. The MCP73833/

4 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

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 set

to 100%. Refer to Section 1.0 “Electrical

Characteristics” for available options and the

“Product Indentification System” for standard

options.

The MCP73833/4 is fully specified over the ambient

temperature range of -40°C to +85°C.

Package Types

DFN-10

MSOP-10

STAT1

STAT2

BAT

THERM

(TE)

PROG

BAT

110

STAT1

STAT2

BAT

THERM

(TE)

BAT

PROG

Stand-Alone Linear Li-Ion / Li-Polymer Charge

Management Controller

Summary of content (32 pages)

PAGE 1
MCP73833/4 Stand-Alone Linear Li-Ion / Li-Polymer Charge Management Controller 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: - 4.2V, 4.35V, 4.4V, or 4.5V, + 0.
PAGE 2
MCP73833/4 Typical Application 1A Li-Ion Battery Charger 1,2 V DD VIN VBAT 9,10 1 µF 1 µF 3 470Ω 4 470Ω 470Ω STAT1 THERM STAT2 7 PG PROG VSS + Single - Li-Ion Cell 8 6 5 1 kΩ T 10 kΩ MCP73833 Functional Block Diagram VDD Direction Control 10 µA VBAT 6 µA CURRENT + LIMIT - G=0.001 1 kΩ G=0.001 PROG Reference Generator + - 111 kΩ VREF (1.21V) 310 kΩ 72.7 kΩ CA 10 kΩ + - PRECONDITION 470.6 kΩ 6 µA + - 6 kΩ + - 48 kΩ TERMINATIO N CHARG E + - 157.
PAGE 3
MCP73833/4 1.0 ELECTRICAL CHARACTERISTICS Absolute Maximum Ratings VDD........................................................................ 7.0V All Inputs and Outputs w.r.t. VSS .....-0.3 to (VDD+0.3)V *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.
PAGE 4
MCP73833/4 DC CHARACTERISTICS (CONTINUED) Electrical Specifications: Unless otherwise specified, 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 Precondition Voltage Threshold Ratio IPREG / IREG VPTH / VREG 7.5 10 12.5 % PROG = 1.
PAGE 5
MCP73833/4 DC CHARACTERISTICS (CONTINUED) Electrical Specifications: Unless otherwise specified, 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 VPD — VBAT + 50 mV — V 2.3V < VBAT < VREG VDD Falling VPDEXIT — VBAT + 150 mV — V 2.3V < VBAT < VREG VDD Rising Input High Voltage Level VIH 2.0 — — V Input Low Voltage Level VIL — — 0.
PAGE 7
MCP73833/4 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 1000 MCP73833 4.
PAGE 8
MCP73833/4 TYPICAL PERFORMANCE CURVES (Continued) 49.0 48.5 Junction Temperature (°C) 0 RPROG = 1 k: -10 1000 Attenuation (dB) Charge Current (mA) 80 70 60 50 FIGURE 2-10: Thermistor Bias Current (ITHRERM) vs. Ambient Temperature (TA). 800 600 400 200 -20 VAC = 100 mVp-p IOUT = 10 mA COUT = 4.7 µF, X7R Ceramic -30 -40 -50 -60 -70 0.01 155 145 135 125 115 105 95 85 75 65 55 45 35 25 0 0.1 Junction Temperature (°C) 0 51.5 -10 Attenuation (dB) 51.0 50.5 50.0 49.5 49.0 48.
PAGE 9
MCP73833/4 TYPICAL PERFORMANCE CURVES (Continued) 0.10 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 -0.25 -0.30 2 -0.20 IOUT = 100 mA COUT = 4.7 µF, X7R Ceramic -0.25 1.0 0.25 0.00 0.20 -0.02 0.15 -0.04 0.10 -0.06 0.05 -0.08 COUT = 4.7 µF, X7R Ceramic -0.10 200 180 160 140 120 100 80 60 40 20 -0.12 0 -0.05 Time (µs) Load Transient Response. © 2009 Microchip Technology Inc. 200 180 160 140 120 5.0 200 4.
PAGE 11
MCP73833/4 3.0 PIN DESCRIPTIONS Descriptions of the pins are listed in Table 3-1. TABLE 3-1: PIN FUNCTION TABLE Pin No. Symbol Function DFN-10 MSOP-10 1 1 VDD 2 2 VDD 3 3 STAT1 Charge Status Output 4 4 STAT2 Charge Status Output 5 5 VSS 6 6 PROG Current Regulation Set and Charge Control Enable 7 7 PG, TE MCP73833: Power Good output, MCP73834: Timer Enable input 8 8 THERM Thermistor input 9 9 VBAT 10 10 VBAT 11 — EP 3.
PAGE 13
MCP73833/4 4.0 FUNCTIONAL DESCRIPTION The MCP73833/4 is a highly advanced linear charge management controller. Refer to the functional block diagram and Figure 4-1 that depicts the operational flow algorithm from charge initiation to completion and automatic recharge.
PAGE 14
MCP73833/4 4.1 Under Voltage Lockout (UVLO) An internal under voltage lockout (UVLO) circuit monitors the input voltage and keeps the charger in shutdown mode until the input supply rises above the UVLO threshold. The UVLO circuitry has a built-in hysteresis of 100 mV. In the event a battery is present when the input power is applied, the input supply must rise +150 mV above the battery voltage before the MCP73833/4 becomes operational.
PAGE 15
MCP73833/4 4.7 Automatic Recharge 4.9 The MCP73833/4 continuously monitors the voltage at the VBAT pin in the charge complete mode. If the voltage drops below the recharge threshold, another charge cycle begins and current is once again supplied to the battery or load. The recharge threshold is factory set. Refer to Section 1.0 “Electrical Characteristics” for recharge threshold options. 4.8 Thermal Shutdown The MCP73833/4 suspends charge if the die temperature exceeds +150°C.
PAGE 17
MCP73833/4 5.0 DETAILED DESCRIPTION 5.1 Analog Circuitry 5.1.1 BATTERY MANAGEMENT INPUT SUPPLY (VDD) The VDD input is the input supply to the MCP73833/4. The MCP73833/4 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 18
MCP73833/4 5.2.2 POWER GOOD (PG) OPTION The power good (PG) option is a pseudo open-drain output. The PG output can sink current, but not source current. However, there is a diode path back to the input, and as such, the PG output should only be pulled up to the input. The PG output is low whenever the input to the MCP73833 is above the UVLO threshold and greater than the battery voltage. If the supply voltage is above the UVLO, but below VREG(Typical)+0.
PAGE 19
MCP73833/4 6.0 APPLICATIONS The MCP73833/4 is designed to operate in conjunction with a host microcontroller or in stand-alone applications. The MCP73833/4 provides the preferred 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 and 6-3 depict the accompanying charge profile. Li-Ion Battery Charger 1,2 CIN LED LED 3 RLED 4 RLED 7 RLED STAT1 THERM STAT2 2.00 4.0 1.
PAGE 20
MCP73833/4 6.1.1.2 Thermal Considerations 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 21
MCP73833/4 6.2 PCB Layout Issues For optimum voltage regulation, place the battery pack as close as possible to the device’s VBAT and VSS pins, recommended to minimize voltage drops along the high current-carrying PCB traces. If the PCB layout is used as a heatsink, adding many vias in the heatsink pad can help conduct more heat to the backplane of the PCB, thus reducing the maximum junction temperature. Figures 6-4 and 6-5 depict a typical layout with PCB heatsinking.
PAGE 23
MCP73833/4 7.0 PACKAGING INFORMATION 7.1 Package Marking Information 10-Lead DFN (3x3) Example: Part Number * XXXX YYWW NNN Marking Code Part Number * MCP73833-AMI/MF AAAA MCP73833-BZI/MF AAAB MCP73833-FCI/MF AAAC MCP73834-FCI/MF MCP73833-GPI/MF AAAD MCP73834-GPI/MF MCP73833-NVI/MF AAAF MCP73834-NVI/MF MCP73833-6SI/MF AAAH MCP73834-6SI/MF MCP73833-CNI/MF AAAK MCP73834-CNI/MF * Consult Factory for Alternative Device Options.
PAGE 24
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PAGE 25
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PAGE 27
MCP73833/4 APPENDIX A: REVISION HISTORY Revision B (May 2009) The following is the list of modifications: 1. 2. 3. 4. Added the MCP73833-6SI/MF and MCP73834-6SI/MF10-lead DFN packages. Updated DFN pinout. Updated Package Outline Drawings. Updated Appendix A Revision History. Revision A (September 2006) • Original Release of this Document. © 2009 Microchip Technology Inc.
PAGE 29
MCP73833/4 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. Device XX Examples: * * XX X/ Output Temp.
PAGE 31
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 32
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