Linear LTC3562 - Manual
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Table of Contents:
- Page 2 – Q U ICK STA RT PROCEDU RE
- Page 3 – Set Load1 and Load2 to 450mA. Set Load3 and; A PPL ICA TION INF ORM A TION; C Q uad S ynchronous
- Page 4 – Proper M easurem ent Equipm ent Setup; M easuring Input or O utput R ipple
- Page 5 – G raphical U ser Interface
- Page 6 – Circuit Schem atic
- Page 7 – REQUIRED CIRCUIT COMPONENTS:; C QUAD SYNCHRONOUS STEP-DOWN; ADDITIONAL DEMO BOARD CIRCUIT COMPONENTS:; SERIAL EEPROM; HARDWARE FOR DEMO BOARD ONLY:; Bill of M aterials
DC1123 QUICK START GUIDE
1
DESCRIPTION
Demonstration circuit 1123 is a Linear U S B Battery
C harger w ith Dual B uck R egulators featuring the
LTC 3562. The LTC3562 is a quad high efficiency mono-
lithic synchronous step-dow n regulator w ith an I
2
C 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 , B urst
M ode operation or forced B urst M ode operation through
I
2
C control. The Type A regulators have separate R U N
pins that can be enabled if I
2
C control is unavailable.
The 2.85V to 5.5V input range makes the LTC -3562 ide-
ally suited for single Li-ion battery pow ered applications.
A t low output load conditions, the regulators can be
sw itched into LDO , B urst M ode operation or forced B urst
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
S w itching frequency is internally set to 2.25M H z, allow -
ing the use of small surface mount inductors and capaci-
tors. A ll regulators are internally compensated.
The LTC3562 is offered in a low profile 3mm
3mm
Q FN package.
Design files for this circuit board are available. Call
the LTC factory.
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)
Input Voltage R ange: V
CC
2.85V to 5.5V (Subject to dropout)
P600A
0.96V to 1.82V, 600mA (M ax)
P600B
1.20V to 3.775V, 600mA (M ax)
P400A
0.80V to 1.51V, 400mA (M ax)
P400B
0.60V to 3.775V, 400mA (M ax)
OPERA TING PRINCIPL ES
The LTC 3562 is a highly integrated pow er management
IC that contains four I
2
C 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 H z, constant-frequency, current mode
sw itching regulators that can be independently con-
trolled through I
2
C. A ll regulators are internally com-
pensated eliminating the need for external compensa-
tion components.
The LTC 3562 offers tw o different types of adjustable
step-dow n regulators. The tw o Type A regulators
(R 600A, R 400A ) can have the feedback voltage ad-
justed from 425mv to 800mv in 25mv increments. The
tw o Type B regulators (R 600B, R 400B ) can have the
DC1 1 2 3
Q U ICK S T A R T G U IDE
L T C3 5 6 2
L in e a r U S B B a t t e ry Ch a rg e r w it h Du a l B u c k R e g u la t o rs
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Summary
DC1123 QUICK START GUIDE 2 output voltages adjusted through I 2 C control from 600mv to 3.775V in 25mv increments. Q U ICK STA RT PROCEDU RE U sing short tw isted pair leads for any pow er connec-tions and w ith all loads and pow er supplies off, refer to Figure 1 for the proper measurement and equi...
DC1123 QUICK START GUIDE 3 17. Set Load1 and Load2 to 450mA. Set Load3 and Load4 to 300mA. A djust P S 1 over the operating range and observe line regulation. A PPL ICA TION INF ORM A TION This demo circuit is designed to demonstrate the full capability of the LTC 3562 I 2 C Q uad S ynchronous S tep...
DC1123 QUICK START GUIDE 4 Figure 1. Proper M easurem ent Equipm ent Setup V IN G N D Figure 2. M easuring Input or O utput R ipple
