Linear Technology Demo Circuit 1402A Quick Start Manual

DESCRIPTION
WARNING!
Do not look directly at operating LED.
This circuit produces light that can damage eyes.
Demo Circuit 1402 is a Highly Integrated 6-Channel
Portable PMIC with a push button controller, two LDOs,
three buck converters, a Li-Ion battery charger, a Power-
Path controller, and high voltage buck controller interface
featuring the LTC3577 and LTC3577-1.
The LTC3577 is a PowerPath™ manager with automatic
load prioritization, battery charger, Bat-Track™ control-
ler, push button controlled power up sequence and reset,
and a 10 LED string controller with gradation and PWM
control. The three buck regulators and the LED Boost
controller have adjustable slew rates for EMI reduction.
PERFORMANCE SUMMARY
PARAMETER
Input Supply Range (V )
BUS
Absolute Wall Input Threshold (V
DV Operating Voltage
CC
DV UVLO (V
CC DVCC,UVLO)
V Regulated Output Voltage (V
BAT
Constant Current Mode Charge Current (I
V UVLO
OUT
V
OUT1
V
OUT2
V
OUT3
LDO1
LDO2
Full-Scale LED Current
Specifications are at T A = 25°C
CONDITIONS
NOTE: The input current limit is reduced when VBUS falls
below 4.45V (TYP).
) V Rising
W WALL
V Falling
WALL
) LTC3577
FLOAT
LTC3577-1
) R = 2KΩ, Input current limit = 1A
CHRG PROG
V Falling
OUT
V Rising
OUT
0 to 500mA
0 to 500mA
0 to 800mA
0 to 150mA
0 to 150mA
Demo Circuit 1402A
QUICK START GUIDE
LTC3577 and LTC3577-1 LTC3577 AND LTC3577-1
Highly Integrated 6-Channel
The LTC3577 has a high temperature battery voltage re-
duction feature that reduces the battery voltage under
high temperature conditions to improve safety and reli-
ability.
The high voltage (HV) buck interface is designed to con-
nect to and control an external HV buck regulator demo
board via the Bat-Track control circuitry. Some of these
demo boards are the DC1394A, DC1395A, and DC1325A,
featuring the LT3480, LT3505, and the LT3563 HV bucks
respectively.
Refer to the LTC3577 datasheet for more details on the
electrical and timing specifications.
Design files for this circuit board are available. Call
the LTC factory.
, LTC, LTM, LT are registered trademarks of Linear Technology Corporation. PowerPath
and Bat-Track are trademarks of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
Portable PMIC
MIN TYP MAX
4.35 5.5
4.3 4.45
3.1 3.2
1.6 5.5
1
4.179 4.200 4.221
4.079 4.100 4.121
465 500 535
2.5 2.7
2.8 2.9
3.3
1.8
1.2
1.5
2.5
20
UNITS
V
V
V
V
V
V
V
mA
V
V
V
V
V
V
V
mA
1