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Description
Demonstration Circuit DC2151A is a nanopower buck-
boost DC/DC with energy harvesting battery charger
featuring the
LTC
3331. The LTC3331 integrates a high
®
voltage energy harvesting power supply plus a DC/DC
converter powered by a rechargeable cell battery to create
a single output supply for alternative energy applications.
The energy harvesting power supply, consisting of an
integrated low-loss full-wave bridge with a high voltage
buck converter, harvests energy from piezoelectric, solar
or magnetic sources. The rechargeable cell input powers a
buck-boost converter capable of operating down to 1.8V
at its input. Either DC/DC converter can deliver energy to
a single output. The buck operates when harvested energy
is available, reducing the quiescent current drawn on the
battery to essentially zero. The buck-boost takes over
when harvested energy goes away.
BoarD photo
Figure 1. DC2151A Demoboard
DEMO MANUAL DC2151A
Nanopower Buck-Boost DC/DC with
Energy Harvesting Battery Charger
A 10mA shunt allows simple battery charging with harvest
energy while a low battery disconnect function protects the
battery from deep discharge. A supercapacitor balancer
is also integrated, allowing for increased output storage.
Voltage and current settings for input and output as well
as the battery float voltage are programmable via pin-
strapped logic inputs.
The LTC3331EUH is available in a 5mm × 5mm 32-lead
QFN surface mount package with exposed pad.
L, L, LTC, LTM, LT, Burst Mode, OPTI-LOOP , Over-The-Top and PolyPhase are registered
trademarks of Linear Technology Corporation. Adaptive Power, C-Load, DirectSense, Easy Drive,
FilterCAD, Hot Swap, LinearView, µModule, Micropower SwitcherCAD, Multimode Dimming, No
Latency Δ∑, No Latency Delta-Sigma, No RSENSE, Operational Filter, PanelProtect, PowerPath,
PowerSOT, SmartStart, SoftSpan, Stage Shedding, SwitcherCAD, ThinSOT, UltraFast and VLDO
are trademarks of Linear Technology Corporation. Other product names may be trademarks of
the companies that manufacture the products.
100
Buck Efficiency vs I
LOAD
90
80
70
60
50
40
30
20
10
V
= 6V, L = 22µH, DCR = 0.19
IN
0
1µ
10µ
100µ
I
LOAD
Figure 2. Typical Efficiency of DC2151A
LTC3331EUH
V
= 1.8V
OUT
V
= 2.5V
OUT
V
= 3.3V
OUT
V
= 5V
OUT
1m
10m
100m
(A)
3331 G34
dc2151af
1
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Table of Contents
Related Manuals for Linear Technology DC2151A
Summary of Contents for Linear Technology DC2151A
- Page 1 PowerSOT, SmartStart, SoftSpan, Stage Shedding, SwitcherCAD, ThinSOT, UltraFast and VLDO battery to essentially zero. The buck-boost takes over are trademarks of Linear Technology Corporation. Other product names may be trademarks of when harvested energy goes away. the companies that manufacture the products.
-
Page 2: Performance Summary
DEMO MANUAL DC2151A performance summary Specifications are at T = 25°C SYMBOL PARAMETER CONDITIONS UNITS Input Voltage Range 18.0 1.8V Output Voltage Range OUT0=0, OUT1=0, OUT2=0 1.728 1.872 2.5V Output Voltage Range OUT0=1, OUT1=0, OUT2=0 2.425 2.575 2.8V Output Voltage Range OUT0=0, OUT1=1, OUT2=0 2.716... - Page 3 DEMO MANUAL DC2151A operating principle The buck regulator uses a hysteretic voltage algorithm OUTPUT VOLTAGE to control the output through internal feedback from the 50mV/DIV sense pin. The buck converter charges an output AC-COUPLED capacitor through an inductor to a value slightly higher...
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Page 4: Quick Start Procedure
Follow the procedure below: increase PS1 voltage to 2.0V while monitoring the input current. If the current remains less than 5mA, 1. Before connecting PS1 to the DC2151A, PS1 must have increase PS1 to 19V. Verify voltage on V is within... - Page 5 DEMO MANUAL DC2151A Quick start proceDure 13. Reconnect PS1 to V turret. Set PS1 to 14V. Set JP8 16. Set the current limit of PS1 to 300mA as described to 1. Set PS2 to 3.8V. Set LOAD1 to 5mA. Remove Terminals.
- Page 6 Remove the battery from the BH1 holder on the bottom input current of 300µA. side of the DC2151A. On the DC2151A, set JP1 to 1, JP2 to 0, JP3 to 1, JP4 to 0, JP5 to1, JP6 to 0, JP7 to 0, JP8, JP9 and JP10 to 0, JP11 to RUN.
- Page 7 DEMO MANUAL DC2151A connection to a Dust mote (Dc9003a-B) compares well with the input power that is charging C during the sleep cycle between VIN_UVLO_FALLING and VIN_UVLO_RISING thresholds at an acceleration force of VAC_OC 1G , shown in Figure 8 below.
- Page 8 DEMO MANUAL DC2151A connection to a Dust mote (Dc9003a-B) PIEZO MIDE V25W 100µH 1µF 22µF 6.3V 22µH LTC3331 2.5V 4.7µF 6.3V 180mF 100µF SCAP 2.7V 6.3V PGVOUT 180mF EH_ON 2.7V HZ202F BAT_IN 2µF IPK2 6.3V IPK1 CHARGE IPK0 OUT2 BAT_OUT OUT1 22µF...
- Page 9 DEMO MANUAL DC2151A connection to a Dust mote (Dc9003a-B) PIEZO MIDE V25W 100µH 1µF 22µF 6.3V 22µH LTC3331 2.5V 4.7µF PULSE 6.3V 180mF 100µF 15mA SCAP 2.7V 6.3V 10ms PGVOUT 180mF EH_ON 2.7V HZ202F BAT_IN 2µF IPK2 Li-ION 6.3V BATTERY...
- Page 10 DEMO MANUAL DC2151A connection to a Dust mote (Dc9003a-B) Figure 1 3 shows the LTC3331 with an output supercapacitor, a Dust Mote attached, a battery installed and EH_ON 5.00V/DIV connected to OUT2. In this configuration, when EH_ON EH_ON is low, V will be set to 2.5V and when EH_ON is high,...
- Page 11 DEMO MANUAL DC2151A connection to a Dust mote (Dc9003a-B) low, causing the targeted V to again be 2.5V. Given that the output capacitor is very large and the average 5.00V/DIV load is less than the input power supplied by the MIDE EH_ON 5.00V/DIV...
- Page 12 DEMO MANUAL DC2151A connection to a Dust mote (Dc9003a-B) MIDE V25W 22µH = 3.6V FOR EH_ON = 1 1µF 22µF = 2.5V FOR EH_ON = 0 6.3V 22µH LTC3331 4.7µF 100µF SCAP 6.3V 6.3V UVLO RISING = 12V* UVLO FALLING = 11V...
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Page 13: Parts List
DEMO MANUAL DC2151A parts list ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components BAT1 CR2032 COIN LI-ION BATTERY POWERSTREAM, Lir2032 BTH1 BATTERY HOLDER COIN CELL 2032 SMD MPD INC, BU2032SM-HD-G SUPERCAP, 90mF, 5.5V, 20mm x 15mm CAP-XX, HZ202F-1 CAP, CHIP, X5R, 150µF, 20%, 6.3V, 1210 SAMSUNG, CL32A157MQVNNNE CAP, CHIP, X5R, 1µF, 10%, 6.3V, 0402... -
Page 14: Schematic Diagram
DEMO MANUAL DC2151A schematic Diagram dc2151af... - Page 15 Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
- Page 16 Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods.
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