MCP73831-2.pdf

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, 4.50V

• 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

The MCP73831/2 devices are highly advanced linear

charge management controllers for use in space-lim-

ited, 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 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 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 temper-

ature 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 “Prod-

uct Identification System” for standard options.

The MCP73831/2 devices are fully specified over the

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

Applications

• Lithium-Ion/Lithium-Polymer Battery Chargers

• Personal Data Assistants

• Cellular Telephones

• Digital Cameras

• MP3 Players

• Bluetooth Headsets

• USB Chargers

Package Types

Typical Application

MCP73831/2

2×3 DFN*

MCP73831/2

SOT-23-5

500 mA Li-Ion Battery Charger

V IN

V DD

5 STAT

PROG

STAT

PROG

V DD

V BAT

Single

Li-Ion

Cell

V DD

V SS

4.7 μ F

V DD

V BAT

PROG

V BAT

470 Ω

2k Ω

* Includes Exposed Thermal Pad (EP); see Ta b l e 3 - 1 .

STAT

V SS

MCP73831

DS21984E-page 1

MCP73831/2

Functional Block Diagram

V DD

6mA

DIRECTION

CONTROL

V BAT

6mA

G=0.001

PROG

0.5 mA

MCP73831

ONLY

REFERENCE

GENERATOR

V REF (1.22V)

43.6 k Ω

361 k Ω

3.9 k Ω

V DD

89 k Ω

PRECONDITION

182.3 k Ω

111 k Ω

15 k Ω

STAT

TERMINATION

7k Ω

CHARGE

190 k Ω

111 k Ω

SHDN

0.5 mA

DIRECTION

CONTROL

V BAT

477 k Ω

UVLO

255 k Ω

100 k Ω

V SS

DS21984E-page 2

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†

V DD ...................................................................................7.0V

All Inputs and Outputs w.r.t. V SS ............... -0.3 to (V DD +0.3)V

Maximum Junction Temperature, T J ............ Internally Limited

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

ESD protection on all pins:

Human Body Model (1.5 k Ω in Series with 100 pF) .......≥ 4kV

Machine Model (200 pF, No Series Resistance) .............400V

DC CHARACTERISTICS

Electrical Specifications: Unless otherwise indicated, all limits apply for V DD = [V REG (typical) + 0.3V] to 6V, T A = -40°C to +85°C.

Typical values are at +25°C, V DD = [V REG (typical) + 1.0V]

Parameters

Sym.

Min.

Typ.

Max.

Units

Conditions

Supply Input

Supply Voltage

V DD

3.75

—

Supply Current

I SS

—

510

1500

µA Charging

—

200

µA Charge Complete,

No Battery

—

µA PROG Floating

—

µA V DD < (V BAT - 50 mV)

—

0.1

µA V DD < V STOP

UVLO Start Threshold

V START

3.3

3.45

3.6

V DD Low-to-High

UVLO Stop Threshold

V STOP

3.2

3.38

3.5

V DD High-to-Low

UVLO Hysteresis

V HYS

—

Voltage Regulation (Constant-Voltage Mode)

Regulated Output Voltage

V REG

4.168

4.20

4.232

MCP7383X-2

4.317

4.35

4.383

MCP7383X-3

4.367

4.40

4.433

MCP7383X-4

4.466

4.50

4.534

MCP7383X-5

V DD = [V REG (typical)+1V]

I OUT = 10 mA

T A = -5°C to +55°C

Line Regulation

|(Δ V BAT /

V BAT )/ Δ V DD |

—

0.09

0.30

%/V V DD = [V REG (typical)+1V] to

6V, I OUT = 10 mA

Load Regulation |Δ V BAT /V BAT |

—

0.05

0.30

I OUT = 10 mA to 50 mA

V DD = [V REG (typical)+1V]

Supply Ripple Attenuation

PSRR

—

—-

dB I OUT =10 mA, 10Hz to 1 kHz

—

dB I OUT =10 mA, 10Hz to 10 kHz

—

dB I OUT =10 mA, 10Hz to 1 MHz

Current Regulation (Fast Charge Constant-Current Mode)

Fast Charge Current

Regulation

I REG

100

110

mA PROG = 10 k Ω

450

505

550

mA PROG = 2.0 k Ω, Note 1

12.5

14.5

16.5

mA PROG = 67 k Ω

T A = -5°C to +55°C

Note 1: Not production tested. Ensured by design.

DS21984E-page 3

MCP73831/2

DC CHARACTERISTICS (CONTINUED)

Electrical Specifications: Unless otherwise indicated, all limits apply for V DD = [V REG (typical) + 0.3V] to 6V, T A = -40°C to +85°C.

Typical values are at +25°C, V DD = [V REG (typical) + 1.0V]

Parameters

Sym.

Min.

Typ.

Max.

Units

Conditions

Preconditioning Current Regulation (Trickle Charge Constant-Current Mode)

Precondition Current

Ratio

I PREG / I REG

7.5

12.5

PROG = 2.0 k Ω to 10 k Ω

—

100

—

No Preconditioning

T A = -5°C to +55°C

Precondition Voltage

Threshold Ratio

V PTH / V REG

66.5

V BAT Low-to-High

71.5

V BAT Low-to-High

Precondition Hysteresis

V PHYS

—

110

—

mV V BAT High-to-Low

Charge Termination

Current Ratio

I TERM / I REG

3.75

6.25

PROG = 2.0 k Ω to 10 k Ω

5.6

7.5

9.4

PROG = 2.0 k Ω to 10 k Ω

8.5

11.5

PROG = 2.0 k Ω to 10 k Ω

T A = -5°C to +55°C

Automatic Recharge

Recharge Voltage

Threshold Ratio

V RTH / V REG

91.5

94.0

96.5

V BAT High-to-Low

96.5

V BAT High-to-Low

Pass Transistor ON-Resistance

ON-Resistance

R DSON

—

350

—

m Ω V DD = 3.75V, T J = 105°C

Battery Discharge Current

Output Reverse Leakage

Current

I DISCHARGE

—

0.15

µA PROG Floating

—

0.25

µA V DD Floating

—

0.15

µA V DD < V STOP

—

-5.5

-15

µA Charge Complete

Status Indicator – STAT

Sink Current

I SINK

—

Low Output Voltage

V OL

—

0.4

I SINK = 4 mA

Source Current

I SOURCE

—

High Output Voltage

V OH

—

V DD -0.4

V DD - 1

I SOURCE = 4 mA (MCP73831)

Input Leakage Current

I LK

—

0.03

µA High-Impedance

PROG Input

Charge Impedance

Range

R PROG

—

k Ω

Minimum Shutdown

Impedance

R PROG

—

200

k Ω

Automatic Power Down

Entry Threshold

V PDENTER

V DD <(V BAT

+20 mV)

V DD <(V BAT

+50 mV)

—

3.5V ≤ V BAT ≤ V REG

V DD Falling

Automatic Power Down

Exit Threshold

V PDEXIT

—

V DD <(V BAT

+150 mV)

V DD <(V BAT

+200 mV)

3.5V ≤ V BAT ≤ V REG

V DD Rising

Thermal Shutdown

Die Temperature

T SD

—

150

— ° C

Die Temperature

Hysteresis

T SDHYS

—

— ° C

Note 1: Not production tested. Ensured by design.

DS21984E-page 4

MCP73831/2

AC CHARACTERISTICS

Electrical Specifications: Unless otherwise indicated, all limits apply for V DD = [V REG (typical) + 0.3V] to 12V,

T A = -40°C to +85°C. Typical values are at +25°C, V DD = [V REG (typical) + 1.0V]

Parameters

Sym.

Min.

Typ.

Max.

Units

Conditions

UVLO Start Delay

t START

—— 5

V DD Low-to-High

Constant-Current Regulation

Transition Time Out of

Preconditioning

t DELAY

—— 1

V BAT < V PTH to V BAT > V PTH

Current Rise Time Out of

Preconditioning

t RISE

—— 1

I OUT Rising to 90% of I REG

Termination Comparator

Filter

t TERM

0.4

1.3

3.2

Average I OUT Falling

Charge Comparator Filter

t CHARGE

0.4

1.3

3.2

Average V BAT

Status Indicator

Status Output turn-off

t OFF

——200

µ sI SINK = 1 mA to 0 mA

Status Output turn-on

t ON

——200

µ sI SINK = 0 mA to 1 mA

TEMPERATURE SPECIFICATIONS

Electrical Specifications: Unless otherwise indicated, all limits apply for V DD = [V REG (typical) + 0.3V] to 12V.

Typical values are at +25°C, V DD = [V REG (typical) + 1.0V]

Parameters

Sym.

Min.

Typ.

Max.

Units

Conditions

Temperature Ranges

Specified Temperature Range

T A

-40

—

+85

°C

Operating Temperature Range

T J

-40

—

+125

°C

Storage Temperature Range

T A

-65

—

+150

°C

Thermal Package Resistances

5-Lead, SOT-23 θ JA — 230 — °C/W 4-Layer JC51-7 Standard

Board, Natural Convection

(Note 2)

8-Lead, 2 mm x 3 mm, DFN θ JA — 76 — °C/W 4-Layer JC51-7 Standard

Board, Natural Convection

(Note 1)

Note 1: This represents the minimum copper condition on the PCB (Printed Circuit Board).

2: With large copper area on the PCB, the SOT-23-5 thermal resistance ( θ JA ) can reach a typical value of

130°C/W or better.

DS21984E-page 5

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