LTC3588EMSE-2#PBF Linear Technology, LTC3588EMSE-2#PBF Datasheet - Page 10

• Manufacturer Part Number: LTC3588EMSE-2#PBF
• Description: IC ENEGRY HARVESTING PSU 10MSOP
• Manufacturer: Linear Technology

Specifications of LTC3588EMSE-2#PBF

• Applications: Energy Harvesting
• Current - Supply: 950nA
• Voltage - Supply: 2.7 V ~ 20 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: *
• Supply Voltage Range: 14V To 20V
• Operating Temperature Range: -40°C To +125°C
• Digital Ic Case Style: MSOP
• No. Of Pins: 10
• Msl: MSL 1 - Unlimited
• Primary Input Voltage: 20V
• Rohs Compliant: Yes
• Supply Voltage Min: 14V
• Leaded Process Compatible: Yes
• No. Of Outputs: 1
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

OPERATION
LTC3588-1
The D0/D1 inputs can be switched while in regulation as
shown in Figure 3. If V
a PGOOD falling threshold above the old V
transition low until the new regulation point is reached.
When V
will remain high through the transition.
10
Figure 3. PGOOD Operation During D0/D1 Transition
OUT
5
4
3
2
1
0
is programmed to a lower voltage, PGOOD
0
C
D1=D0=0
OUT
2
= 100μF , I
4
OUT
6
LOAD
D1=D0=1
8
TIME (ms)
is programmed to a voltage with
= 100mA
10
12
PGOOD = LOGIC1
14
D1=D0=0
16
V
18
35881 F03
OUT
OUT
20
, PGOOD will
Energy Storage
Harvested energy can be stored on the input capacitor or
the output capacitor. The wide input range takes advantage
of the fact that energy storage on a capacitor is proportional
to the square of the capacitor voltage. After the output
voltage is brought into regulation any excess energy is
stored on the input capacitor and its voltage increases.
When a load exists at the output the buck can effi ciently
transfer energy stored at a high voltage to the regulated
output. While energy storage at the input utilizes the high
voltage at the input, the load current is limited to what
the buck converter can supply. If larger loads need to be
serviced the output capacitor can be sized to support a
larger current for some duration. For example, a current
burst could begin when PGOOD goes high and would
continuously deplete the output capacitor until PGOOD
went low.
35881fa