Performance Summary - Linear Technology DC2048A Manual

DEMO MANUAL DC2048A

performance summary

SYMBOL PARAMETER
V Input Voltage Range
IN
V Battery Voltage Range
BAT
V 1.8V Output Voltage Range
OUT
V 2.5V Output Voltage Range
OUT
V 2.8V Output Voltage Range
OUT
V 3.0V Output Voltage Range
OUT
V 3.3V Output Voltage Range
OUT
V 3.6V Output Voltage Range
OUT
V 4.5V Output Voltage Range
OUT
V 5.0V Output Voltage Range
OUT
LDO 1.2V LDO Voltage Range
LDO 1.5V LDO Voltage Range
LDO 1.8V LDO Voltage Range
LDO 2.0V LDO Voltage Range
LDO 2.5V LDO Voltage Range
LDO 3.0V LDO Voltage Range
LDO 3.3V LDO Voltage Range
LDO LD0_IN LDO Voltage Range
operating principle
Refer to the block diagram within the LTC3330 data sheet
for its operating principle.
The LTC3330 combines a buck switching regulator and
a buck-boost switching regulator to produce an energy
harvesting solution with battery backup. The converters are
controlled by a prioritizer that selects which converter to
use based on the availability of a battery and/or harvestable
energy. If harvested energy is available, the buck regula-
tor is active and the buck-boost is off. With an optional
LDO and supercapacitor balancer and an array of different
configurations, the LTC3330 suits many applications.
The synchronous buck converter is an ultralow quiescent
current power supply tailored to energy harvesting applica-
tions. It is designed to interface directly to a piezoelectric
or alternative A/C energy source, rectify and store the har-
vested energy on an external capacitor while maintaining a
regulated output voltage. It can also bleed off any excess
input power via an internal protective shunt regulator.
2
Specifications are at T = 25°C
A
CONDITIONS
OUT0 = 0, OUT1 = 0, OUT2 = 0
OUT0 = 1, OUT1 = 0, OUT2 = 0
OUT0 = 0, OUT1 = 1, OUT2 = 0
OUT0 = 1, OUT1 = 1, OUT2 = 0
OUT0 = 0, OUT1 = 0, OUT2 = 1
OUT0 = 1, OUT1 = 0, OUT2 = 1
OUT0 = 0, OUT1 = 1, OUT2 = 1
OUT0 = 1, OUT1 = 1, OUT2 = 1
LDO0 = 0, LDO1 = 0, LDO2 = 0
LDO0 = 1, LDO1 = 0, LDO2 = 0
LDO0 = 0, LDO1 = 1, LDO2 = 0
LDO0 = 1, LDO1 = 1, LDO2 = 0
LDO0 = 0, LDO1 = 0, LDO2 = 1
LDO0 = 1, LDO1 = 0 ,LDO2 = 1
LDO0 = 0, LDO1 = 1, LDO2 = 1
LDO0 = 1, LDO1 = 1, LDO2 = 1
An internal full-wave bridge rectifier accessible via AC1
and AC2 inputs, rectifies AC sources such as those from
a piezoelectric element. The rectified output is stored on
a capacitor at the V
reservoir for the buck converter. The bridge rectifier has
a total drop of about 800mV at typical piezo-generated
currents, but is capable of carrying up to 50mA.
When the voltage on V
threshold the buck converter is enabled and charge is
transferred from the input capacitor to the output capaci-
tor. When the input capacitor voltage is depleted below
the UVLO falling threshold the buck converter is disabled.
These thresholds can be set according to Table 4 of the
data sheet which offers UVLO rising thresholds from 4V
to 18V with large or small hysteresis windows.
Two internal rails, CAP and V
are used to drive the high side PMOS and low side NMOS
of the buck converter, respectively. Additionally the V
MIN MAX
3.0 18.0
1.8 5.5
1.728 1.872
2.425 2.575
2.716 2.884
2.910 3.090
3.200 3.400
3.492 3.708
4.365 4.635
4.850 5.150
1.176 1.224
1.470 1.530
1.764 1.836
1.960 2.040
2.450 2.550
2.940 3.060
3.234 3.366
LDO_IN
pin and can be used as an energy
IN
rises above the UVLO rising
IN
, are generated from V
IN2
UNITS
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
and
IN
IN2
dc2048afb