DC512B - ANALOG DEVICES

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT DC512B

4A SMART BATTERY CHARGER

LTC4100

DESCRIPTION

Demonstration circuit DC512B is a single battery switch-

ing step-down charge controller featuring the LTC4100.

The recommended input power is 15 to 20V at 3.5A. A

two-position jumper allows choice of protected output

voltage range suitable for 3- and 4-Cell Li-ion batteries.

Removal of the jumper allows full output voltage range.

The maximum charge current is 4A.

The demo board is initially configured for 12.6V at 3A

for popular 3-cell Li-ion battery packs. LTC4100 will au-

tomatically charge a Smart Battery to termination as

soon as input power is applied with a battery connected

prior to power up. A VOUT pin automatically provides

power to the system load from the wall adapter or bat-

tery. Status LEDs are provided for CHG, ACP,

SMBALERT

and SMBus activity.

The optional DC1223A-B SMBUS to USB adapter and

associated software to control, monitor, and data log the

system for demonstration purposes only. This software

is not required to charge a battery with the DC512B.

Contact your LT representative for ordering a

DC1223A-B.

Design files for this circuit board are available at

http://www.linear.com/demo

Performance Summary

= 25°C

PARAMETER CONDITIONS / NOTES VALUE

Input Voltage Range VIN > VBAT to charge. Limited by input capacitor ratings. 15 – 25V

ACP Trip voltage V

DCDIV

Rising 14.6V ± 3%

Input Current Limit 3.5A ± 7%

Battery Voltage Limit 3CELL (R

VILIM

= 10kΩ ± 1%) 13.104VBAT, Typ.

4CELL (R

VILIM

= 33kΩ ± 1%) 17.408VBAT, Typ.

VILIM

OPEN 28.006, Typ.

Programmable Float Voltage Accuracy ± 0.8%

Minimum Voltage Step All VLIM Settings 16mV

# of Voltage Steps 11-Bit range 2048 steps

Battery Current Sense Voltage Limit 3A (R

ILIM

= 33kΩ ± 1%) 82.3mV, Max

4A (R

ILIM

OPEN) 107.3mV, Max

Programmable Charge Current Accuracy ±5%, 3% is typical

Minimum Current Step 3A & 4A Settings 4mA

# of Current Steps 10-Bit range 1024 Steps

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT DC512B

4A SMART BATTERY CHARGER

QUICK START PROCEDURE

Demonstration circuit 512B is easy to set up to

evaluate the performance of the LTC4100. Refer to

Figure 1 for proper measurement equipment setup

and follow the procedure below.

Set the jumpers according to the voltage and cur-

rent specifications of the pack under evaluation.

With all power off, connect input power supply,

and meters as shown in Figure 1.

3. Preset the system load to 0A and the input sup-

ply to 0V, 0A current limit.

4. Turn on the supply, setting the current limit to

3.5A.

5. Adjust the input voltage to the desired value, up

to 25V.

6. Connect the battery to begin charging.

Plug in

the battery. An industry standard 5-pin Smart Bat-

tery connector is provided as well as generic sol-

dering test points for hardwire connections.

Optional

1. For different ILIM & VLIM settings, adjust JP1

& JP3 as necessary.

2. To disable charging through hardware, connect

CHGEN to GND.

To probe the SMBus communication or connect to

an external host, connect leads to SDA, SCL, and

GND.

4. To use an external logic supply, disable the on-

board 5V linear regulator by setting JP2 to OFF.

Note: Not supplying an alternative VLOGIC will

disable the LEDs as well as SMBus communica-

tions, which prevents charging. It is always rec-

ommended to supply a VLOGIC at all times.

Use DC1223A-B USB-to-SMBus demoboard to

control and configure the provided DC512B evalu-

ation software.

Please refer to the LTC4100 datasheet for additional information.

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT DC512B

4A SMART BATTERY CHARGER

Figure 1. Proper Measurement Equipment Setup

VIN

−

SMART

BATTERY

−

VOUT

OPTIONAL DC1223A-B SMBUS

TO USB ADAPTER

PROVIDES DATA LOGGING AND

BATTERY CONTROL

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT DC512B

4A SMART BATTERY CHARGER

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURE / PART #

Required Circuit Components

1 1 C2 Capacitor, Y5V, 0.1μF, 80%, 25V 0603 AVX, 06033G104ZAT2A

2 4 C3, C4, C9, C10 Capacitor, X5R, 10μF, 20%, 25V 0603 AVX, 18123D106MAT2A

3 1 C5 Capacitor, X7R, 0.01μF, 20%, 25V 0603 AVX, 06033C103KAT2A

4 1 C6 Capacitor, X7R, 0.1μF, 10%, 10V 0603 AVX, 0603ZC104MAT2A

5 1 C7 Capacitor, X7R, 0.12μF, 10%, 10V 0603 AVX, 0603ZC124MAT2A

6 2 C8, C14 Capacitor, X7R, 0.1μF, 10%, 16V 0805 AVX, 0805YC104KAT2A

7 1 C16 Capacitor, X7R, 1500pF, 10%, 100V 0603 AVX, 06031C152KAT2A

8 1 D1 Diode Schottky, 1A, 40V POWERMITE Diodes Inc., MMSZ5248BS-7-F

9 1 L1 Inductor, 10μH, High Current, WE-HCL 1050 Wurth Electronik, 7443251000

10 1 Q1 MOSFET, Dual P-Channel, SO-8 Vishay, Si4925DDY-T1-GE3

11 1 Q2 MOSFET, Single P-Channel, SO-8 Vishay, Si4431CDY-T1-GE3

12 7 Q3-Q9 MOSFET, N-Channel, 60V, 115mA, SOT23-3 Diodes Inc./Zetex, 2N7002TA

13 1 Q11 MOSFET, Single N-Channel, SSOT-6 Fairchild, FDC655BN

14 1 R1 Resistor, 5.1K, 1/16W, 5% 0603 Vishay, CRCW06035K10JNEA

15 1 R2 Resistor, 0.028Ω, 1/2W, 1% 1206 Vishay, WSL1206R0280FEA

16 2 R4, R5 Resistor, 15K, 1/16W, 5% 0603 Vishay, CRCW04023K00JNED

17 1 R7 Resistor, 0.025Ω, 1/2W, 1% 1206 Vishay, WSL1206R0250FEA

18 1 R8 Resistor, 100Ω, 1/16W, 5% 0603 Vishay, CRCW0603100RJNEA

19 1 R10 Resistor, 1.13k, 1/16W, 1% 0603 Vishay, CRCW06031K13FKEA

20 1 R12 Resistor, 6.04k, 1/16W, 1% 0603 Vishay, CRCW06036K04FKEA

21 1 R14 Resistor, 54.9k, 1/16W, 1% 0603 Vishay, CRCW060354K9FKEA

22 1 R16 Resistor, 100K, 1/16W, 1% 0603 Vishay, CRCW0603100KFKEA

23 1 R17 Resistor, 13.7k, 1/16W, 1% 0603 Vishay, CRCW060313K7FKEA

24 1 R20 Resistor, 1.21k, 1/16W, 1% 0603 Vishay, CRCW06031K21FKEA

25 1 U1 I.C. Smart Battery Charger SSOP-24 Linear Technology LTC4100EG#PBF

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT DC512B

4A SMART BATTERY CHARGER

PARTS LIST

Additional Demo Board Circuit Components

1 1 C1 Capacitor, ELECT., 10μF, 10% 35V Sun Electronics, 35CE10AX

2 1 C11 Capacitor, Y5V, 1μF, 80%, 25V 1206 AVX, 12063G105ZAT2A

3 1 C12 Capacitor, X7R, 0.1μF, 20%, 16V 0603 AVX, 0603YC104KAT2A

4 1 C13 Capacitor, TANT, 10μF, 20%, 16V 3828 AVX, TAJB106M016RNJ

5 1 C15 Capacitor, X7R, 0.068μF, 10%, 16V 0603 AVX, 0603YC683KAT2A

6 1 D2 Diode, Zener, 18V SOD-323 Diode Inc., MMSZ5248BS-7

7 1 D3 LED, Orange Rohm, SML-010DTT86L

8 3 D4, D5, D6 LED, Green Rohm, SML-010FTT86L

9 1 D7 LED, Red Rohm, SML-010VTT86L

10 1 D8 Diode, Dual Schottky, 75V, 350mW, SOT23-3 Diodes Inc., BAV70-7-F

11 2 R9, R11 Resistor, 10Ω, 1/16W, 5% 0603 Vishay, CRCW060310R0JNEA

12 1 R13 Resistor, 10k, 1/16W, 5% 0603 Vishay, CRCW060310K0FKEA

13 0 R15 OPT.

14 6 R18, R21-R25 Resistor, 300Ω, 1/16W, 5%, 0603 Vishay, CRCW0603300RJNEA

15 1 R19, R26 Resistor, 33.2k, 1/16W, 1% 0603 Vishay, CRCW060333K2FKEA

16 1 U2 I.C. Linear Regulator SO-8 Linear Technology LT1129CS8-5#PBF

Hardware/Components (For Demo Board Only)

1 3 JP1-JP3 Header, 3 Pin, single row, 0.079"CC Sullins, NRPN031PAEN

2 1 J1 Connector., Power Jack 2.1mm CUI Inc., PJ-002A

3 1 J2 Header, Right Angle TE Connectivity, 5787441-1

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

5 9 TP1-TP10, TP12-TP14 Turret, Test Pin, .061" Mill-Max, 2308-2-00-80-00-00-07-0

6 4 MH1-MH4 Standoff, Snap-on Nylon KEYSTONE, 8831

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT DC512B

4A SMART BATTERY CHARGER