Linear Technology DC1229B Manuel utilisateur

dc1229bf

DEMO MANUAL DC1229B

Description

LT3650EDD-4.2/LT3650EDD-4.1

2A Monolithic Li-Ion

Battery Chargers

DC1229B is a 2A monolithic Li-Ion battery charger featur-

ing the LT

3650EDD-4.2/LT3650EDD-4.1. The LT3650 is a

complete mid-power Li-Ionbattery charger that canoperate

over a wide input voltage range. The circuit provides CC/CV

charging with a maximum charge current externally pro-

grammable up to 2A. A precondition feature trickle charges

a low-voltage battery and bad battery detection provides L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. All other trademarks are the property of their respective owners.

perForMAnce sUMMArY

operAting principles

a signal if the battery doesn’t respond to preconditioning.

The LT3650EDD is available in a 12-lead (3mm × 3mm)

DFN surface mount package with an exposed pad.

Design files for this circuit board are available at

http://www.linear.com/demo

(TA= 25°C)

PARAMETER CONDITIONS VALUE

Input Voltage Range 7.5V to 32V

VOUT 3.7V to 4.24V

Output Float Voltage Constant Voltage Mode 4.2V/4.1V

Output Current Limit ILIM RRNG = 20kΩ 2A

LT3650 is a complete monolithic mid-power Li-Ion battery

charger, addressing high input voltage applications with

solutions that require a minimum of external components.

The IC uses a 1MHz constant frequency, average-current

mode step-down architecture. Internal reverse voltage

protection allows direct connection to the input supply

without a blocking diode for single-cell applications

(LT3650-4.2/LT3650-4.1).

NOTE: A blocking diode on the input supply connection

is recommended to prevent the input from ringing below

ground with a battery on the output.

The LT3650 incorporates a 2A switch that is driven by a

bootstrapped supply to maximize efficiency during charg-

ing cycles. Wide inputrange allows operation to full charge

from 5V ±5% (single cell) to 36V. A precision-threshold

shutdown pin allows incorporation of UVLO functionality

using a simple resistor-divider. The IC can also be put into

a low-current shutdown mode, in which the input supply

bias is reduced to only 15µA.

The LT3650 incorporates several degrees of chargecurrent

control freedom. The overall maximum charge current is

set using an external inductor current sense resistor. A

maximum charge currentprogramming pin allowsdynamic

manipulation of the battery charge current. The LT3650

also incorporates a system input-supply current limit

control feature that servos the battery charge current to

accommodate overall system load requirements.

The LT3650 automatically enters a battery precondition

mode if the sensed battery voltage is very low. In this mode,

the charging current is reduced to 15% of the programmed

maximum, as set by the inductor sense resistor, RSENSE.

Once the battery voltage climbs above an internally set

threshold of 2.9V/cell, the IC automatically increases

maximum charging current to the full programmed value.

dc1229bf

DEMO MANUAL DC1229B

operAting principles

TheLT3650canuseacharge-currentbased‘C/10’termina-

tion scheme, which ends a charge cycle when the battery

charge current falls to 1/10th the programmed maximum

charge current. TheLT3650 also contains aninternal charge

cycle controltimer, for timer-basedtermination. When using

the internal timer, the IC combines C/10 detection with a

programmable time constraint, during which the charging

cycle can continue beyond the C/10 level to “top-off” a

battery. The charge cycle terminates when a specific time

elapses, typically 3 hours. When the timer-based scheme

is used, the IC also supports ‘bad-battery’ detection, which

triggers a system fault if a battery stays in precondition

mode for more than 1/8th of the total charge cycle time.

Once charging is terminated and the LT3650 is not actively

charging, the IC automatically entersa low-current standby

mode where supply bias currents are reduced to < 100µA.

If the battery voltage drops 2.5% from the full-charge float

voltage, the LT3650 engages an automatic charge cycle

restart. The IC also automatically restarts a new charge

cycle after a bad battery fault once the failed battery is

removed and replaced with another battery.

The LT3650 contains provisions for a battery temperature

monitoring circuit. This feature monitors battery tem-

perature during the charging cycle using a thermistor,

and suspends charging and signals a fault condition if

the battery temperature moves outside a safe charging

range of 0°C to 50°C.

The LT3650 contains two digital open-collector outputs,

which provide charger status and signal fault conditions.

These binary-coded pins signal battery charging, standby

or shutdown modes, battery temperature faults, and bad

battery faults.

qUick stArt proceDUre

DC1229 is easy to set up to evaluate the performance of

the LT3650EDD-4.2/LT3650EDD-4.1.

Use a blocking diode on the input supply connection, and

short twisted pair leads for the power connections. With

all loads and power supplies off, refer to Figure 1 for the

proper measurement and equipment setup.

Follow the procedure below:

1. Jumper and Power Supply Setting:

JP1 = 1 PS1 = OFF

JP2 = 1 PS2 = OFF

JP3 = C/10

2. Turn on PS2 and slowly increase the voltage until VBAT

is 2.7V while monitoring the current into the BAT pin.

If the current is less than 5mA, turn on PS1. Increase

PS1 until VIN is 5V while monitoring the input current.

If the current is less than 5mA, increase PS1 until VIN

is 12V.

3. Verifythat the batterycharging current, IBAT, is between

200mA and 300mA. The CHRG LED should be on and

the FAULT LED should be off.

4. Increase PS2 until VBAT is 3.6V. Verify the input cur-

rent, IIN, is between 700mA and 850mA, the battery

current, IBAT, is between 1.875A and 2.225A and that

the CHRG LED is on.

5. Increase PS2 until VBAT is 4.25V. Verify the battery

charging current, IBAT, is less than 5mA and that the

CHRG LED is off.

6. Decrease PS2 until VBAT is 3.9V. Verify the battery

current, IBAT, is between 1.875A and 2.225A and that

the CHRG LED is on.

7. Decrease PS2 until VBAT is 3.6V. Connect a 10k resistor

from the RNG/SS pin to ground. Verify the charging

current, IBAT, is between 850mA and 1.0A. Verify the

voltage, VRNG, on the RNG/SS turret is between 450mV

and 550mV and the voltage VNTC on the NTC turret is

between 1.8V and 1.9V. Remove the 10k resistor from

the RNG/SS pin to ground.

8. Set JP1 to SHDN. Verify the charging current, IBAT, is

less than 5mA and that the FAULT LED and the CHRG

LED are off.

dc1229bf

DEMO MANUAL DC1229B

qUick stArt proceDUre

Figure 1. Proper Measurement Equipment Setup

9. Set JP1 to RUN. Connect a jumper from the NTC pin to

ground. Verify the charging current, IBAT, is less than

5mA and that the FAULT LED and the CHRG LED are on.

10. Remove the jumper from NTC to ground. Verify the

charging current, IBAT, is between 1.875A and 2.225A

and that the FAULT LED is off and the CHRG LED is on.

11. Turn on LOAD1 and set to 1A. Verify the voltage,

VSYSTEM, on the system load turret is approximately

equal to VIN.

12. Turn off PS1, PS2 and LOAD1.

Note: Put a blocking diode between the input supply and the VIN terminal.

Kelvin connect the voltage meters directly to the board terminals as shown

on the diagram. Use twisted pair input and output leads.

dc1229bf

DEMO MANUAL DC1229B

pArts list

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C1 Capacitor, X7R, 1µF, 50V, 10%, 0805 Murata, GRM21BR71H105KA12B

2 2 C3, C6 Capacitor, X7R, 4.7µF, 50V, 10%, 1210 Murata, GRM32R71H475KA091B

3 1 C4 Capacitor, X7R, 10µF, 10V, 10%, 0805 Murata, GRM21BR71A106KE19B

4 2 C5, C8 Capacitor, Chip, X5R, 0.1µF, ±10%, 10V, 0402 AVX, 0402ZD104KAT2A

5 1 C7 Capacitor, X5R, 0.68µF, 10V, 10%, 0402 Murata, GRM155R61A684KE15D

6 1 C9 Capacitor, X5R, 100µF, 6.3V, 20%, 1206 Murata, GRM31CR60J107ME19L

7 1 D1 SMD, Schottky Barrier Rectifier Central Semi, CMSH3-40MA

8 1 D2 SMD, Schottky Diode, SOT-23F Central Semi, CMPSH1-4

9 1 L1 Power Inductor 6.8µH 20% 4.5A Vishay, IHLP2525CZER6R8M011

10 1 R4 Resistor, Chip, 0.05Ω, 1/2W, 1%, 1206 IRC, LRC-LR1206-01-R050-F

11 1 R5 Resistor, Chip, 100k, 1/16W, 1%, 0402 Vishay, CRCW0402100KFKED

12 1 R7 Resistor, Chip, 1M, 1/16W, 1%, 0402 Vishay, CRCW04021M00FKED

13 1 R8 Resistor, Chip, 0.1Ω, 1/2W, 1%, 1206 IRC, LRC-LR1206-01-R100-F

14 1 U1 (Option A)

U1 (Option B)

2A Monolithic Li-Ion Battery Charger Linear Technology, LT3650EDD-4.2

Linear Technology, LT3650EDD-4.1

Optional Demo Circuit Components

1 1 C2 Capacitor, SMT, 22µF, 50V, 20% Sanyo, 50CE22BS

2 2 C10, C11 Capacitor, Chip, X7R, 0.022µF, ±10%, 16V, 0402 AVX, 0402YC223KAT2A

3 0 R6 (Opt) Resistor, Chip, 0402 User Defined

4 1 D3 LED, Red Panasonic, LNJ208R8ARA

5 1 D4 LED, Green Lite-On, LTST-C190KGKT

6 1 R1 Resistor, Chip, 0 ,1/16W, 0805 Vishay, CRCW08050000Z0EA

7 2 R2, R3 Resistor, Chip, 5.1K,1/4W, 1%, 1206 Vishay, CRCW12065K10FKEA

8 0 C12 (Opt) Capacitor, Chip, X7R, 0.01µF, ±10%, 50V, 0603 AVX, 06035C103KAT2A

Hardware

1 8 E1-E8 Testpoint, Turret, .095" Mill-Max, 2501-2-00-80-00-00-07-0

2 1 J1 Header, 3 Pins Hirose Electric, DF3A-3P-2DSA

3 3 JP1, JP2, JP3 2MM Single Row Header, 3 Pin Samtec, TMM-103-02-L-S

4 3 JP1, JP2, JP3 Shunt Samtec, 2SN-BK-G

5 4 Stand-Off, Nylon 0.375" Tall (Snap-On) Keystone, 8832 (Snap On)

dc1229bf

DEMO MANUAL DC1229B

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-

tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.

scheMAtic DiAgrAM

D D

C C

B B

A A

VIN

7.5V - 32V

TIMER

C/10

Unless noted:

Resistors: Ohms

0402

1/16W

Capacitors:

0402

10%

10V

VFLOAT *

(OPT)

VERSION TABLE

JP2

Assembly Version

UVLO

VFLOAT *

DC1229B - A

DC1229B - B

4.2V

LT3650EDD - 4.2

1JP1

LT3650EDD - 4.1 4.1V

RUN

SHDN

DC1229B - A/B

Wednesday, April 01, 2009

J.Drew 1/19/09

2A Monolithic Li-Ion Battery Charger

LT3650EDD - 4.2 / LT3650EDD - 4.1

SIZE

SCALE:

CAGE CODE DWG NO REV

SHEET OF

FILENAME:

TITLE

CONTRACT NO.

APPROVALS DATE

DRAWN

CHECKED

APPROVED

ENGINEER

DESIGNER

TECHNOLOGY

1630 McCarthy Blvd.

Milpitas, CA 95035

Phone: (408)432-1900

Fax: (408)434-0507

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

CUSTOMER NOTICE

GND

10uF

16V

0805

10%

4.7uF

50V

1210

100K

CMPSH1-4

1 3

1uF

50V

0805

FAULT

RED

JP1

RNG / SS

(OPT)

C12

0.01uF

0603

50V

GND

4.7uF

50V

1210

GND R2

5.1K

1206

SYSTEM LOAD

0.1

1206

1/2W

JP3

CMSH3-40MA

2 1

DF3-3P-2DSA

(OPT)

BAT

GND

NTC

5.1K

1206

LT3650EDD

CLP

SHDN

BOOST

FAULT

RNG/SS

CHRG

BAT

NTC

VIN

TIMER

SENSE

GND

0.1uF

L1 6.8uH

IHLP-2525CZ-01

1 2

22uF

50V

20%

NTC

1.0Meg

C10

0.022uF

16V

0.05

1206

1/4W

R1 0

0805

BAT

100uF

6.3V

1206

20%

CHRG

GRN

C11

0.022uF

16V

JP2

0.1uF

0.68uF

dc1229bf

DEMO MANUAL DC1229B

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 ●FAX: (408) 434-0507 ●www.linear.com

 LINEAR TECHNOLOGY CORPORATION 2011

LT 0711 • PRINTED IN USA

DEMONSTRATION BOARD IMPORTANT NOTICE

Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:

This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT

OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete

in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety

measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union

directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.

If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date

of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU

OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS

FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR

ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.

The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims

arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all

appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or

agency certified (FCC, UL, CE, etc.).

No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance,

customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.

LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.

Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and

observe good laboratory practice standards. Common sense is encouraged.

This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC applica-

tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

Mouser Electronics

Authorized Distributor

Click to View Pricing, Inventory, Delivery & Lifecycle Information:

Analog Devices Inc.:

DC1229B-A

Ce manuel convient aux modèles suivants

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