Instrukcja obsługi Microchip MCP73826

Microchip nieskategoryzowany MCP73826

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 2002-2013 Microchip Technology Inc. DS21705B-page 1

MCP73826

Features

• Linear Charge Management Controller for Single

Lithium-Ion Cells

• High Accuracy Preset Voltage Regulation:

+1% (max)

• Two Preset Voltage Regulation Options:

- 4.1V - MCP73826-4.1

- 4.2V - MCP73826-4.2

• Programmable Charge Current

• Automatic Cell Preconditioning of Deeply

Depleted Cells, Minimizing Heat Dissipation Dur-

ing Initial Charge Cycle

• Automatic Power-Down when Input Power

Removed

• Temperature Range: -20°C to +85°C

• Packaging: 6-Pin SOT-23A

Applications

• Single Cell Lithium-Ion Battery Chargers

• Personal Data Assistants

• Cellular Telephones

• Hand Held Instruments

• Cradle Chargers

• Digital Cameras

Typical Application Circuit

Description

The MCP73826 is a linear charge management con-

troller for use in space-limited, cost sensitive applica-

tions. The MCP73826 combines high accuracy

constant voltage, controlled current regulation, and cell

preconditioning in a space saving 6-pin SOT-23A pack-

age. The MCP73826 provides a stand-alone charge

management solution.

The MCP73826 charges the battery in three phases:

preconditioning, controlled current, and constant volt-

age. If the battery voltage is below the internal low-volt-

age threshold, the battery is preconditioned with a

foldback current. The preconditioning phase protects

the lithium-ion cell and minimizes heat dissipation.

Following the preconditioning phase, the MCP73826

enters the controlled current phase. The MCP73826

allows for design flexibility with a programmable charge

current set by an external sense resistor. The charge

current is ramped up, based on the cell voltage, from

the foldback current to the peak charge current estab-

lished by the sense resistor. This phase is maintained

until the battery reaches the charge-regulation voltage.

Then, the MCP73826 enters the final phase, constant

voltage. The accuracy of the voltage regulation is better

than ±1% over the entire operating temperature range

and supply voltage range. The MCP73826-4.1 is preset

to a regulation voltage of 4.1V, while the MCP73826-

4.2 is preset to 4.2V.

The MCP73826 operates with an input voltage range

from 4.5V to 5.5V. The MCP73826 is fully specified

over the ambient temperature range of -20°C to +85°C.

Package Type

GND

DRV

SNS

BAT

SHDN

1 2

10 µF

100 k



100 m



Single

Lithium-Ion

Cell

NDS8434

MA2Q705

500 mA Lithium-Ion Battery Charger

10 µF

MCP73826

6-Pin SOT-23A

GND

VDRV

VSNS

VIN

VBAT

SHDN 1

MCP73826

Single Cell Lithium-Ion Charge Management Controller

MCP73826

DS21705B-page 2  2002-2013 Microchip Technology Inc.

Functional Block Diagram

VOLTAGE CONTROL

AMPLIFIER

SHUTDOWN,

REFERENCE

GENERATOR

VREF (1.2V)

–

VREF

VIN

CHARGE CURRENT

CONTROL AMPLIFIER

–

VREF

SHDN

VBAT

GND

VDRV

–

CHARGE

CURRENT

AMPLIFIER

VIN

VSNS

1.1 k

12 k

500 k

75 k

352.5 k

(NOTE 1)

CHARGE CURRENT

FOLDBACK AMPLIFIER

–

37.5 k

112.5 k

VIN

0.3V CLAMP

NOTE 1: Value = 340.5K for MCP73826-4.1

Value = 352.5K for MCP73826-4.2

 2002-2013 Microchip Technology Inc. DS21705B-page 3

MCP73826

1.0 ELECTRICAL

CHARACTERISTICS

1.1 Maximum Ratings*

VIN ................................................................................... -0.3V to 6.0V

All inputs and outputs w.r.t. GND ................-0.3 to (VIN+0.3)V

Current at VDRV.......................................................... +/-1 mA

Maximum Junction Temperature, TJ.............................. 150°C

Storage temperature .....................................-65°C to +150°C

ESD protection on all pins4 kV

*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 peri-

ods may affect device reliability.

PIN FUNCTION TABLE

DC CHARACTERISTICS: MCP73826-4.1, MCP73826-4.2

TEMPERATURE SPECIFICATIONS

Pin Name Description

1 SHDN Logic Shutdown

2 GND Battery Management

0V Reference

3VBAT Cell Voltage Monitor Input

4 VDRV Drive Output

5 VIN Battery Management

Input Supply

6 VSNS Charge Current Sense Input

Unless otherwise specified, all limits apply for V IN = [VREG(typ)+1V], RSENSE = 500 mTA = -20°C to +85°C.

Typical values are at +25°C. Refer to Figure 1-1 for test circuit.

Parameter Sym Min Typ Max Units Conditions

Supply Voltage VIN 4.5 5.5 V—

Supply Current IIN —

—

0.5

260

560

µA Shutdown, VSHDN = 0V

Constant Voltage Mode

Voltage Regulation (Constant Voltage Mode)

Regulated Output Voltage VREG 4.059

4.158

4.1

4.2

4.141

4.242

MCP73826-4.1 only

MCP73826-4.2 only

Line Regulation VBAT -10 — 10 mV VIN = 4.5V to 5.5V,

IOUT = 75 mA

Load Regulation VBAT -1 +0.2 1 mV IOUT = 10 mA to 75 mA

Output Reverse Leakage Current I LK — 8 — µA VIN=Floating, VBAT=VREG

External MOSFET Gate Drive

Gate Drive Current IDRV —

0.08

—

Sink, CV Mode

Source, CV Mode

Gate Drive Minimum Voltage VDRV — 1.6 — V

Current Regulation (Controlled Current Mode)

Current Sense Gain ACS — 100 — dB (VSNS-VDRV) / VBAT

Current Limit Threshold VCS 40 53 75 mV (VIN-VSNS) at IOUT

Foldback Current Scale Factor K — 0.43 — A/A

Shutdown Input - SHDN

Input High Voltage Level VIH 40 — — %VIN

Input Low Voltage Level VIL — — 25 %VIN

Input Leakage Current I LK — — 1 µA VSHDN

= 0V to 5.5V

Unless otherwise specified, all limits apply for V IN = 4.5V-5.5V

Parameters Sym Min Typ Max Units Conditions

Temperature Ranges

Specified Temperature Range TA-20 — +85 °C

Operating Temperature Range TA-40 — +125 °C

Storage Temperature Range TA-65 — +150 °C

Thermal Package Resistances

Thermal Resistance, 6-Pin SOT-23A JA — 230 — °C/W 4-Layer JC51-7 Standard

Board, Natural Convection

Specyfikacje produktu

Marka:	Microchip
Kategoria:	nieskategoryzowany
Model:	MCP73826

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