Linear Battery Charger DC1123 User Manual

DC1 1 2 3  
Q U ICK S TA R T G U IDE  
LTC3 5 6 2  
L in e a r U S B B a tte ry Ch a rg e r w ith Du a l B u c k R e g u la to rs  
DESCRIPTION  
Demonstration circuit 1123 is a Linear USB Battery  
Charger w ith Dual Buck Regulators featuring the  
LTC3562. The LTC3562 is a quad high efficiency mono-  
lithic synchronous step-dow n regulator w ith an I2C inter-  
face. Tw o regulators are externally adjustable and can  
have their feedback voltages programmed betw een  
425mV and 800mV in 25mV (Type A). The other tw o  
regulators are fixed output regulators w hose output volt-  
ages can be programmed betw een 600mV and 3.775V in  
25mV steps (Type B). All four regulators operate inde-  
pendently and can be put into pulse skip, LDO, Burst  
M ode operation or forced Burst M ode operation through  
I2C control. The Type A regulators have separate RUN  
pins that can be enabled if I2C control is unavailable.  
At low output load conditions, the regulators can be  
sw itched into LDO, Burst M ode operation or forced Burst  
M ode operation, extending battery life in portable sys-  
tems. The quiescent current drops to under 100µA w ith  
all regulators in LDO mode and under 0.1µA w hen all  
regulators are shut dow n  
Sw itching frequency is internally set to 2.25M Hz, allow -  
ing the use of small surface mount inductors and capaci-  
tors. All regulators are internally compensated.  
The LTC3562 is offered in a low profile 3mm  
QFN package.  
4
3mm  
Design files for this circuit board are available. Call  
the LTC factory.  
The 2.85V to 5.5V input range makes the LTC-3562 ide-  
ally suited for single Li-ion battery pow ered applications.  
L
, LTC, LTM , LT, Burst M ode, are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective ow ners.  
TABLE 1. Typical Specifications (25°C)  
2.85V to 5.5V (Subject to dropout)  
0.96V to 1.82V, 600mA (M ax)  
1.20V to 3.775V, 600mA (M ax)  
0.80V to 1.51V, 400mA (M ax)  
0.60V to 3.775V, 400mA (M ax)  
Input Voltage Range: V  
P600A  
CC  
P600B  
P400A  
P400B  
OPERA TING PRINCIPLES  
The LTC3562 is a highly integrated pow er management  
IC that contains four I2C controllable, monolithic, high  
efficiency step-dow n regulators. Tw o regulators pro-  
vide up to 600ma of output current and the other tw o  
regulators produce up to 400ma. All four regulators  
are 2.25M Hz, constant-frequency, current mode  
sw itching regulators that can be independently con-  
trolled through I2C. All regulators are internally com-  
pensated eliminating the need for external compensa-  
tion components.  
The LTC3562 offers tw o different types of adjustable  
step-dow n regulators. The tw o Type A regulators  
(R600A, R400A) can have the feedback voltage ad-  
justed from 425mv to 800mv in 25mv increments. The  
tw o Type B regulators (R600B, R400B) can have the  
1
 
DC1123 QUICK START GUIDE  
17. Set Load1 and Load2 to 450mA. Set Load3 and  
Load4 to 300mA. Adjust PS1 over the operating range  
and observe line regulation.  
input damping netw ork w ill likely not be required.  
Please note that the in-circuit capacitance of the  
specified 10uF, 0805 ceramic capacitor for C1 and C2  
is less than 5uF each w ith VIN greater than 4.25 Volts.  
For good transient response and stability the output  
capacitor each buck regulator should retain at least  
4uF of capacitance over the operating temperature  
and voltage range.  
A PPLICA TION INFORM A TION  
This demo circuit is designed to demonstrate the full  
capability of the LTC3562 I2C Quad Synchronous  
Step-Dow n DC-DC Regulator. Not all components are  
required in all applications. The critical circuit com-  
ponents are on the top of the board near the IC and  
listed in the Required Circuit Components section of  
the Bill of M aterials, in Figure 5.  
The output inductors for the OUT600A and OUT600B  
are the recommended values of 3.3uH w hile the  
OUT400A and OUT400B are 4.7uH.  
Resistors R4 and R6 are to adjust the output voltage  
seen on the OUT600A output w hile R3 and R4 w ill set  
the voltage on the OUT400A output.  
The input capacitor netw ork of C1 and R1 is used to  
dampen source lead inductances that commonly oc-  
cur in laboratory setups w ith tw isted leads and a  
bench pow er supply. W hen using a USB cable this  
3
 
DC1123 QUICK START GUIDE  
Figure 1. Proper M easurem ent Equipm ent Setup  
Figure 2. M easuring Input or Output Ripple  
4
 
DC1123 QUICK START GUIDE  
Figure 3.  
Figure 3. Graphical User Interface  
5
 
DC1123 QUICK START GUIDE  
Figure 4. Circuit Schem atic  
6
 
DC1123 QUICK START GUIDE  
Item Qty  
Reference - Des  
Part Description  
Manufacturer, Part #  
REQUIRED CIRCUIT COMPONENTS:  
CAP, CHIP X5R, 10uF, 10V, 0805  
1
2
3
4
5
6
7
8
9
1
4
2
2
2
1
1
1
1
2
C2  
C4,C7,C8,C9  
C5,C6  
L2,L4  
L1,L3  
R3  
Murata, GRM21BR61A106KE19  
TDK, C1608X5R0J106M  
Murata, GRM1557U1H100JZ01D  
TOKO, 1098AS-3R3M  
CAP, CHIP,X5R, 10uF, 6.3V, 0603  
CAP, CHIP, COG, 10pF, 50v, 0402  
INDUCTOR, 3.3uH, 0.120 Ohms, 1.0A  
INDUCTOR, 4.7uH, 0.155 Ohms, 0.88A  
RES, 0402, 475K OHMS, 1%, 1/16w  
RES, 0402, 634K OHMS, 1%, 1/16w  
RES, 0402, 536K OHMS, 1%, 1/16w  
RES, 0402, 499K OHMS, 1%, 1/16w  
TOKO, 1098AS-4R7M  
VISHAY, CRCW0402475KFKED  
VISHAY, CRCW402634KFKED  
VISHAY, CRCW402536KFKED  
VISHAY, CRCW0402499KFKED  
VISHAY, CRCW04023M30JNED  
R4  
R5  
R6  
10  
R12,R13  
RES, 0402, 3.3M OHMS, 5%, 1/16w  
I2C QUAD SYNCHRONOUS STEP-DOWN  
DC/DC REGULATOR  
11  
1
U1  
LINEAR TECH, LTC3562EUD  
ADDITIONAL DEMO BOARD CIRCUIT COMPONENTS:  
1
2
3
4
5
6
7
2
1
1
1
4
1
1
C10,C11  
CAP, CHIP, X5R, 0.1uF, 10V  
CAP, CHIP,X5R, 10uF, 10V  
RES, 0402, 0.0 Ohms, 1/16w  
RES, 0402, 100K Ohms, 5%, 1/16w  
RES, 0402, 5.1K OHMS, 5%, 1/16w  
RES, 0402, 1 OHM, 5%, 1/16w  
SERIAL EEPROM  
TDK, C1005X5R1A104K  
C1  
R7  
R2  
TDK, C2012X5R0J106M  
VISHAY, CRCW04020000Z0ED  
VISHAY, CRCW0402100KJNED  
VISHAY, CRCW04025K1JNED  
VISHAY, CRCW04021R00JNED  
MICROCHIP, 24LC025-I/ST  
R8,R9,R10,R11  
R1  
U2  
HARDWARE FOR DEMO BOARD ONLY:  
HEADER,3 PINS, 2mm  
1
2
3
4
2
2
1
1
JP1,JP2  
JP1,JP2  
J1  
SAMTEC, TMM-103-02-L-S  
SAMTEC, 2SN-BK-G  
TYCO, 1734035-2  
MOLEX/WALDEN, 87831-1420  
SHUNT, 2mm  
CONN, USB MINI-B  
HEADER, 2X7 PIN, 0.079CC  
J2  
E1,E5,E6,E7,E8,  
E9,E15,E16,E17,  
E18  
5
10  
TURRET, 0.09 DIA  
MILL-MAX, 2501-2  
E2,E3,E4,E10,E11,  
E12,E13,E14  
6
7
8
4
TURRET, 0.061 DIA  
MILL-MAX, 2308-2  
STAND-OFF, NYLON 0.25" tall (SNAP ON)  
KEYSTONE, 8831 (SNAP ON)  
Figure 5. Bill of M aterials  
7
 

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