Linear Technology DC1362A-A Quick setup guide

dc1362aabfa

DEMO MANUAL DC1362A-A/-B

DESCRIPTION

LT3651EUHE-4.2/-4.1

4A High Voltage Li-Ion

Battery Charger

Demonstrationcircuit1362A-A/1362A-Bisa4Ahighvoltage

Li-Ion battery charger featuring the LT

3651EUHE-4.2/

LT3651EUHE-4.1. The LT3651 is a complete, high power

Li-Ion battery charger that can operate over a wide input

voltage range. The charger is aconstant-current, constant-

voltage type with a maximum charge current of 4A that can

be externally set. A precondition feature trickle charges a

low voltage battery and bad battery detection provides a

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

signalifthe batterydoesn’t respondtopreconditioning. The

LT3651EUHE is available in a 36-lead (5mm × 6mm) QFN

surface mount package with two exposed thermal pads.

Design files for this circuit board are available at

http://www.linear.com/demo

Input Voltage Range 6.5V to 32V

VOUT 2.9V to 4.24V (–A)/2.7V to 4.14V (–B)

Output Float Voltage (Constant Voltage Mode) 4.2V (–A)/4.1V (–B)

Output Current Limit ILIM 4A

Specifications are at TA= 25°C

OPERATING PRINCIPLE

LT3651 is a complete Li-Ion battery charger, addressing

wide input voltage (6.5V to 32V) and high charge current

(up to 4A). High charging efficiency, as shown in Figure 1,

is produced with a constant frequency, average current

mode synchronous step-down switcher architecture.

The charger includes the necessary circuitry to allow for

programming and control of constant-current, constant-

voltage (CC/CV) charging with both current only and

timer termination. High charging efficiency is achieved

by using a bootstrapped supply for low switch drop on

the high side driver and a MOSFET for the low side (syn-

chronous) switch.

Maximum charge current is set with an external sense

resistor in series with the inductor and is adjusted through

the RNG/SS pin. The total system input current is moni-

tored with an input sense resistor and is used to maintain

constantinputcurrentby regulating batterycharge current.

It is adjusted through the ILIM pin.

If the battery voltage is low, charge current automatically

reduces to 15% of the programmed current to provide

safe battery preconditioning. Once the battery voltage

climbs above the battery precondition threshold, the IC

automatically increases the maximum charging current

to the full programmed value.

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dc1362aabfa

DEMO MANUAL DC1362A-A/-B

OPERATING PRINCIPLE

Charge termination can occur when charge current de-

creases to one-tenth of the programmed maximum charge

current (C/10 termination). Alternately, termination can

be timer based through the use of an internal program-

mable charge cycle control timer. When using the timer

termination, charging continues beyond the C/10 level

to top off a battery. Charging typically terminates three

hours after initiation. When the timer-based scheme is

used, bad battery detection is also supported. A system

fault is triggered if a battery stays in precondition mode

for more than one-eighth of the total charge cycle time.

Once charging is terminated and the LT3651 is not ac-

tively charging, the IC automatically enters a low current

standby mode in which supply bias currents are reduced

to <85µA. If the battery voltage drops below 2.5% from the

full charge float voltage, the LT3651 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.

After charging is complete, the input bias current lines

connected to the battery are reduced to minimize battery

discharge.

The LT3651 contains provisions for a battery temperature

monitoring circuit. Battery temperature is monitored by

using an NTC thermistor located with the battery. If the Figure 1. Efficiency and Power Loss vs VIN

Demonstration circuit 1362A-A/1362A-B is easy to set

up to evaluate the performance of the LT3651EUHE-4.2/

LT3651EUHE-4.1.

Using short twisted pair leads for any power connections,

with all loads and power supplies off, refer to Figure 2 for

the proper measurement and equipment setup.

Follow the procedure below:

1. Jumper and power supply setting:

JP1 = RUN PS1 = OFF

JP2 = C/10 PS2 = OFF

battery temperature moves outside the safe charging range

of 0°C to 40°C the charging cycle suspends and signals

a fault condition.

The LT3651 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.

A precision undervoltage lockout is possible by using a

resistor divider on the shutdown pin (SHDN). The input

supply current is 17µA when the IC is in shutdown.

QUICK START PROCEDURE

2. TurnonPS2 and slowlyincreasethe voltage to2.7Vwhile

monitoring the current into the BAT pin. If the current

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

PS1 to 4V while monitoring the input current. If the

current is less than 5mA, increase PS1 to 12V.

3. Verify that the battery charging current, IBAT is between

400mA and 600mA. The CHRG LED and ACPR LED

should be on and the FAULT LED should be off.

VIN (V)

EFFICIENCY (%)

POWER LOSS (W)

15 25

DC1362ab F01

3.2

3.6

4.0

4.4

2.8

2.4

2.0

10 20 30 32

VBAT = 3.9

EFF

PLOSS

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dc1362aabfa

DEMO MANUAL DC1362A-A/-B

QUICK START PROCEDURE

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

rent IIN is between 1.4A and 1.7A, the battery current

IBAT is between 3.75A and 4.45A and that the CHRG

LED and ACPR LED are on.

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

charging current IBAT is less than 5mA and that the

CHRG LED and ACPR LED are off.

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

rent IBAT is between 3.75A and 4.45A that the CHRG

LED and ACPR LED are 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 1.7A and 2.0A. Verify the volt-

age VNTC on the NTC turret is between 1.6V and 1.9V

and the voltage VRNG on the RNG/SS turret is between

450mV and 700mV. 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, CHRG LED and

ACPR LED are off.

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, CHRG LED and ACPR

LED are on.

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

charging current IBAT is between 3.75A and 4.45A

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

ACPR LED are on.

11. TurnonLOAD1 andsetto 1A.Verifythe voltageVSYSTEM

on the system voltage turret is approximately equal

to VIN.

12. Turn off PS1, PS2 and LOAD1.

Figure 2. Proper Measurement Equipment Setup

NOTE: ALL CONNECTIONS FROM EQUIPMENT SHOULD BE KELVIN CONNECTED DIRECTLY TO THE BOARD PINS WHICH

THEY ARE CONNECTED TO ON THIS DIAGRAM AND ANY INPUT, OR OUTPUT, LEADS SHOULD BE TWISTED PAIR.

DC1362ab F02

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dc1362aabfa

DEMO MANUAL DC1362A-A/-B

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C1 CAP, X7R, 1µF, 50V, 10%, 0805 MURATA, GRM21BR71H105KA12L

2 4 C3, C6, C11, C12 CAP, X7S, 10µF, 50V, 20%, 1210 TDK, C3225X7S1H106M

3 1 C4 CAP, X7R, 10µF, 10V, 10%, 0805 MURATA, GRM21BR71A106KE51L

4 3 C5, C7, C13 CAP, X5R, 0.68µF, 10V, 10%, 0402 MURATA, GRM155R61A684KE15D

5 1 C8 CAP, X5R, 100µF, 6.3V, 20%, 1210 TAIYO YUDEN, LMK325BJ107MM-T

6 1 D2 SMD, SCHOTTKY DIODE, SOT-23 CENTRAL SEMI, CMPSH1-4 TR

7 1 D6 DIODE, ZENER, 10V SOD-123 CENTRAL SEMI, CMHZ4697

8 1 L1 POWER INDUCTOR 3.3µH 20% 8.0A, 9mΩ 7mm × 7mm WURTH, 744314330

9 1 Q1 MOSFET, PCHANNEL, 40V, 25mΩ 1212-8 VISHAY, Si7611DN

10 1 R1 RES, CHIP, 0.015Ω, 1/2W, 1%, 1206 IRC, LRC-LR1206LF-01-R015-F

11 1 R4 RES, CHIP, 0.024Ω, 1/2W, 1%, 1206 IRC, LRC-LR1206LF-01-R024-F

12 2 R5, R12 RES, CHIP, 10k, 1/16W, 1%, 0402 VISHAY, CRCW040210K0FKED

13 1 R7 RES, CHIP, 44.2k, 1/16W, 1%, 0402 VISHAY, CRCW040244K2FKED

14 1 R8 RES, CHIP, 0.05Ω, 1/2W, 1%, 1206 IRC, LRC-LR1206LF-01-R050-F

15 1 R9 RES, CHIP, 147k, 1/16W, 1%, 0402 VISHAY, CRCW0402147KFKED

16 1 R13 RES, CHIP, 100k, 1/16W, 1%, 0402 VISHAY, CRCW0402100KFKED

17 1 U1 (-A VERSION)

U1 (-B VERSION)

4A HIGH VOLTAGE Li-ION BATTERY CHARGER LINEAR TECHNOLOGY, LT3651EUHE-4.2

LINEAR TECHNOLOGY, LT3651EUHE-4.1

Optional Electrical Components

1 1 C2 CAP, SMT, 22µF, 50V 20% SUNCON, 50CE22BS

2 2 C9, C10 CAP, CHIP, X7R, 0.022µF, ±10%, 16V, 0402 AVX, 0402YC223KAT2A

3 0 D1 SMD, SCHOTTKY, 5A, 40V DIODES INC, PDS540-13

4 1 D3 LED, RED PANASONIC, LNJ208R8ARA

5 2 D4, D5 LED, GREEN LITE-ON, LTST-C190KGKT

6 0 J1 HEADER, 3 PINS HIROSE ELECTRIC, DF3A-3P-2DSA

7 3 R2, R3, R10 RES, CHIP, 5.1k,1/4W, 5%, 1206 VISHAY, CRCW12065K10JNED

8 0 R6, R11 RES, CHIP, 20k, 1/16W, 1%, 0402 VISHAY, CRCW040220K0FKED

Hardware for Demo Circuit

1 8 E1 TO E8 TESTPOINT, TURRET 0.095" MILL-MAX, 2501-2-00-80-00-00-07-0

2 2 JP1, JP2 2MM SINGLE ROW HEADER 3 PIN SAMTEC, TMM-103-02-L-S

3 2 JP1, JP2 SHUNT SAMTEC, 2SN-BK-G

4 4 MH1 TO MH4 STAND-OFF, NYLON 0.375" TALL (SNAP ON) KEYSTONE, 8832 (SNAP ON)

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dc1362aabfa

DEMO MANUAL DC1362A-A/-B

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

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dc1362aabfa

DEMO MANUAL DC1362A-A/-B

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

 LINEAR TECHNOLOGY CORPORATION 2012

LT 0213 REV A • PRINTED IN USA

DEMONSTRATION BOARD IMPORTANT NOTICE

Linear Technology Corporation (LT C ) 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 LT C 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 LT C 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. LT C assumes no liability for applications assistance,

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

LT C 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 LT C applica-

tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

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