LTC3330_15 Datasheet, PDF (12/32 Pages) Linear Technology – Nanopower Buck-Boost DC/DC with Energy Harvesting Battery Life Extender

LTC3330
TYPICAL PERFORMANCE CHARACTERISTICS ^TA ^{= 25°C, unless otherwise noted.}
R_DS(ON) of LDO PMOS vs
Temperature
12
11
LDO_IN = 1.8V
10
9
8
7
LDO_IN = 2.5V
6
LDO_IN = 3.3V
5
4
3
–50 –25
LDO_IN = 5V
0 25 50 75
TEMPERATURE (°C)
100 125
3330 G54
I_SCAP vs SCAP
250
200
150
100
50
125°C
85°C
25°C
–40°C
0
2 2.5 3 3.5 4 4.5 5 5.5
SCAP (V)
3330 G55
Supercapacitor Balancer Source/
Sink Current
50
40
SCAP = 5V
30
20
10
SCAP = 2.5V
0
–10
–20
0
10 20 30 40 50 60 70 80 90 100
V_BAL/V_SCAP (%)
3330 G56
PIN FUNCTIONS
BAL (Pin 1): Supercapacitor Balance Point. The common
node of a stack of two supercapacitors is connected to
BAL. A source/sink balancing current of up to 10mA is
available. Tie BAL along with SCAP to GND to disable the
balancer and its associated quiescent current.
SCAP (Pin 2): Supply and Input for Supercapacitor
Balancer. Tie the top of a 2-capacitor stack to SCAP and
the middle of the stack to BAL to activate balancing. Tie
SCAP along with BAL to GND to disable the balancer and
its associated quiescent current.
V_IN2 (Pin 3): Internal Low Voltage Rail to Serve as Gate
Drive for Buck NMOS Switch. Connect a 4.7µF (or larger)
capacitor from V_IN2 to GND. This pin is not intended for
use as an external system rail.
UV3, UV2, UV1, UV0 (Pins 4, 5, 6, 7): UVLO Select Bits
for the Buck Switching Regulator. Tie high to V_IN2 or low to
GND to select the desired UVLO rising and falling thresholds
(see Table 4). The UVLO falling threshold must be greater
than the selected V_OUT regulation level. Do not float.
AC1 (Pin 8): Input Connection for Piezoelectric Element,
Other AC Source, or current limited DC source (used in
conjunction with AC2 for differential AC inputs).
V_IN (Pin 10): Rectified Input Voltage. A capacitor on this
pin serves as an energy reservoir and input supply for the
buck regulator. The V_IN voltage is internally clamped to a
maximum of 20V (typical).
CAP (Pin 11): Internal Rail Referenced to V_IN to Serve
as Gate Drive for Buck PMOS Switch. Connect a 1μF (or
larger) capacitor between CAP and V_IN. This pin is not
intended for use as an external system rail.
SW (Pin 12): Switch Node for the Buck Switching Regula-
tor. Connect a 22µH or greater external inductor between
this node and V_OUT.
V_OUT (Pin 13): Regulated Output Voltage Derived from the
Buck or Buck-Boost Switching Regulator.
SWB (Pin 14): Switch Node for the Buck-Boost Switching
Regulator. Connect an external inductor (value in Table 3)
between this node and SWA.
SWA (Pin 15): Switch Node for the Buck-Boost Switching
Regulator. Connect an external inductor (value in Table 3)
between this node and SWB.
BAT (Pin 16): Battery Input. BAT serves as the input to
the buck-boost switching regulator.
AC2 (Pin 9): Input Connection for Piezoelectric Element,
Other AC Source, or current limited DC source (used in
conjunction with AC1 for differential AC inputs).
3330fb
12
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