LTC3588IDD-1#PBF [Linear]
LTC3588-1 - Nanopower Energy Harvesting Power Supply; Package: DFN; Pins: 10; Temperature Range: -40°C to 85°C;
| 型号： | LTC3588IDD-1#PBF |
| 厂家： | 
Linear |
| 描述： | LTC3588-1 - Nanopower Energy Harvesting Power Supply; Package: DFN; Pins: 10; Temperature Range: -40°C to 85°C 开关 光电二极管 输出元件 |
| 文件： | 总20页 (文件大小：495K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LTC3588-1
Nanopower Energy
Harvesting Power Supply
FEATURES
DESCRIPTION
The LTC®3588-1 integrates a low-loss full-wave bridge
rectifier with a high efficiency buck converter to form a
complete energy harvesting solution optimized for high
output impedance energy sources such as piezoelectric,
solar, or magnetic transducers. An ultralow quiescent
current undervoltage lockout (UVLO) mode with a wide
hysteresiswindowallowschargetoaccumulateonaninput
capacitor until the buck converter can efficiently transfer a
portion of the stored charge to the output. In regulation,
theLTC3588-1entersasleepstateinwhichbothinputand
outputquiescentcurrentsareminimal.Thebuckconverter
turns on and off as needed to maintain regulation.
n
950nA Input Quiescent Current (Output in
Regulation – No Load)
n
450nA Input Quiescent Current in UVLO
n
2.7V to 20V Input Operating Range
n
Integrated Low-Loss Full-Wave Bridge Rectifier
n
Up to 100mA of Output Current
n
Selectable Output Voltages of 1.8V, 2.5V, 3.3V, 3.6V
n
High Efficiency Integrated Hysteretic Buck DC/DC
n
Input Protective Shunt – Up to 25mA Pull-Down at
V ≥ 20V
IN
n
Wide Input Undervoltage Lockout (UVLO) Range
n
Available in 10-Lead MSE and 3mm × 3mm DFN
Packages
Four output voltages, 1.8V, 2.5V, 3.3V and 3.6V, are pin
selectablewithupto100mAofcontinuousoutputcurrent;
however, the output capacitor may be sized to service a
higher output current burst. An input protective shunt set
at 20V enables greater energy storage for a given amount
of input capacitance.
APPLICATIONS
n
Piezoelectric Energy Harvesting
n
Electro-Mechanical Energy Harvesting
n
Wireless HVAC Sensors
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
n
Mobile Asset Tracking
n
Tire Pressure Sensors
n
Battery Replacement for Industrial Sensors
n
Remote Light Switches
n
Standalone Nanopower Buck Regulator
TYPICAL APPLICATION
100mA Piezoelectric Energy Harvesting Power Supply
LTC3588-1 3.3V Regulator Start-Up Profile
22
C
= 22µF, C
= 47µF
OUT
STORAGE
20
18
16
14
12
10
8
NO LOAD, I = 2µA
VIN
MIDE V21BL
PZ1
PZ2
SW
10µH
V
IN
V
V
OUT
IN
LTC3588-1
1µF
6V
47µF
6V
V
OUT
CAP
PGOOD
D0, D1
C
STORAGE
2
OUTPUT
VOLTAGE
SELECT
V
25V
6
IN2
GND
V
OUT
4.7µF
6V
4
35881 TA01
2
PGOOD = LOGIC 1
0
0
200
400 600
TIME (s)
35881 TA01b
35881fc
1
For more information www.linear.com/LTC3588-1
LTC3588-1
(Note 1)
ABSOLUTE MAXIMUM RATINGS
V
V
....................–0.3V to Lesser of (V + 0.3V) or 6V
IN
OUT IN2
PGOOD.............. –0.3V to Lesser of (V
Low Impedance Source ....................... –0.3V to 18V*
Current Fed, I = 0A ...................................... 25mA
+ 0.3V) or 6V
OUT
†
I
, I ............................................................. 50mA
...................................................................... 350mA
SW
PZ1 PZ2
I
PZ1, PZ2...........................................................0V to V
IN
SW
D0, D1..............–0.3V to [Lesser of (V + 0.3V) or 6V]
Operating Junction Temperature Range
IN2
IN
IN
CAP......................[Higher of –0.3V or (V – 6V)] to V
(Notes 2, 3)................................................–40 to 125°C
Storage Temperature Range ......................–65 to 150°C
Lead Temperature (Soldering, 10 sec)
IN
V
................... –0.3V to [Lesser of (V + 0.3V) or 6V]
IN2
* V has an internal 20V clamp
IN
†
MSE Only..........................................................300°C
For t < 1ms and Duty Cycle < 1%,
Absolute Maximum Continuous Current = 5mA
PIN CONFIGURATION
TOP VIEW
TOP VIEW
PZ1
PZ2
CAP
1
2
3
4
5
10 PGOOD
PZ1
PZ2
CAP
IN
SW
1
2
3
4
5
10 PGOOD
9
8
7
6
D0
D1
9
8
7
6
D0
D1
11
11
GND
GND
V
V
V
IN2
OUT
V
V
V
IN
IN2
SW
OUT
MSE PACKAGE
10-LEAD PLASTIC eMSOP
DD PACKAGE
T
= 125°C, θ = 45°C/W, θ = 10°C/W
JA JC
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
JMAX
10-LEAD (3mm × 3mm) PLASTIC DFN
T
= 125°C, θ = 43°C/W, θ = 7.5°C/W
JA JC
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
JMAX
ORDER INFORMATION
LEAD FREE FINISH
LTC3588EDD-1#PBF
LTC3588IDD-1#PBF
LTC3588EMSE-1#PBF
LTC3588IMSE-1#PBF
TAPE AND REEL
PART MARKING*
LFKY
PACKAGE DESCRIPTION
10-Lead (3mm × 3mm) Plastic DFN
TEMPERATURE RANGE
–40°C to 125°C
LTC3588EDD-1#TRPBF
LTC3588IDD-1#TRPBF
LFKY
10-Lead (3mm × 3mm) Plastic DFN
10-Lead Plastic eMSOP
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
LTC3588EMSE-1#TRPBF LTFKX
LTC3588IMSE-1#TRPBF LTFKX
10-Lead Plastic eMSOP
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping
container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
This product is only offered in trays. For more information go to: http://www.linear.com/packaging/
35881fc
2
For more information www.linear.com/LTC3588-1
LTC3588-1
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are for TA = 25°C. (Note 2) VIN = 5.5V unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
l
V
IN
Input Voltage Range
Low Impedance Source on V
18.0
V
IN
I
V
Quiescent Current
UVLO
Buck Enabled, Sleeping
Buck Enabled, Sleeping
Buck Enabled, Not Sleeping
VIN
IN
V
V
V
= 2.5V, Not PGOOD
= 4.5V
450
950
1.7
700
1500
2.5
nA
nA
µA
µA
IN
IN
IN
= 18V
I
= 0A (Note 4)
150
250
SW
V
UVLO
V
Undervoltage Lockout Threshold
V
Rising
IN
IN
l
l
l
l
1.8V Output Selected; D1 = 0, D0 = 0
2.5V Output Selected; D1 = 0, D0 = 1
3.3V Output Selected; D1 = 1, D0 = 0
3.6V Output Selected; D1 = 1, D0 = 1
3.77
3.77
4.73
4.73
4.04
4.04
5.05
5.05
4.30
4.30
5.37
5.37
V
V
V
V
V
IN
Falling
l
l
l
l
1.8V Output Selected; D1 = 0, D0 = 0
2.5V Output Selected; D1 = 0, D0 = 1
3.3V Output Selected; D1 = 1, D0 = 0
3.6V Output Selected; D1 = 1, D0 = 1
2.66
2.66
3.42
3.75
2.87
2.87
3.67
4.02
3.08
3.08
3.91
4.28
V
V
V
V
V
V
Shunt Regulator Voltage
I
= 1mA
19.0
25
20.0
21.0
V
mA
mV
SHUNT
IN
VIN
I
Maximum Protective Shunt Current
1ms Duration
= 10µA
SHUNT
Internal Bridge Rectifier Loss
(|V – V | – V )
I
350
400
450
20
BRIDGE
PZ1
PZ2
IN
Internal Bridge Rectifier Reverse
Leakage Current
V
= 18V
nA
V
REVERSE
REVERSE
Internal Bridge Rectifier Reverse
Breakdown Voltage
I
= 1µA
V
30
SHUNT
V
Regulated Output Voltage
1.8V Output Selected
Sleep Threshold
Wake-Up Threshold
2.5V Output Selected
Sleep Threshold
Wake-Up Threshold
3.3V Output Selected
Sleep Threshold
OUT
l
l
1.812
1.788
1.890
2.575
3.399
3.708
V
V
1.710
2.425
3.201
l
l
2.512
2.488
V
V
l
l
3.312
3.288
V
V
Wake-Up Threshold
3.6V Output Selected
Sleep Threshold
l
l
3.612
3.588
V
V
Wake-Up Threshold
3.492
83
PGOOD Falling Threshold
Output Quiescent Current
Buck Peak Switch Current
Available Buck Output Current
Buck PMOS Switch On-Resistance
Buck NMOS Switch On-Resistance
Max Buck Duty Cycle
As a Percentage of the Selected V
92
89
%
nA
mA
mA
Ω
OUT
I
I
I
V
OUT
= 3.6V
150
350
VOUT
PEAK
BUCK
200
100
260
R
1.1
1.3
P
N
R
Ω
l
l
l
100
1.2
%
V
V
D0/D1 Input High Voltage
D0/D1 Input Low Voltage
D0/D1 Input High Current
D0/D1 Input Low Current
V
IH(D0, D1)
IL(D0, D1)
IH(D0, D1)
IL(D0, D1)
0.4
10
10
V
I
I
nA
nA
35881fc
3
For more information www.linear.com/LTC3588-1
LTC3588-1
ELECTRICAL CHARACTERISTICS
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
junction temperature range. Note that the maximum ambient temperature
consistent with these specifications is determined by specific operating
conditions in conjunction with board layout, the rated package thermal
impedance and other environmental factors.
Note 2: The LTC3588-1 is tested under pulsed load conditions such
Note 3: The junction temperature (T , in °C) is calculated from the ambient
temperature (T , in °C) and power dissipation (P , in Watts) according
A D
J
that T ≈ T . The LTC3588E-1 is guaranteed to meet specifications
J
A
from 0°C to 85°C junction temperature. Specifications over the –40°C
to 125°C operating junction temperature range are assured by design,
characterization, and correlation with statistical process controls.
The LTC3588I-1 is guaranteed over the full –40°C to 125°C operating
to the formula: T = T + (P • θ ), where θ (in °C/W) is the package
thermal impedance.
Note 4: Dynamic supply current is higher due to gate charge being
delivered at the switching frequency.
J
A
D
JA
JA
TYPICAL PERFORMANCE CHARACTERISTICS
IVIN in UVLO vs VIN
IVIN in Sleep vs VIN
UVLO Rising vs Temperature
2400
2200
2000
1800
1600
1400
1200
1000
800
1000
900
800
700
600
500
400
300
200
100
0
5.2
5.0
4.8
4.6
4.4
4.2
4.0
3.8
D1 = D0 = 0
D1 = D0 = 1
D1 = D0 = 1
85°C
85°C
25°C
25°C
–40°C
–40°C
D1 = D0 = 0
600
400
2
4
6
8
10 12 14 16 18
(V)
0
1
2
3
4
5
6
–55 –35 –15
5
25 45 65 85 105 125
V
V
(V)
TEMPERATURE (°C)
IN
IN
35881 G02
35881 G01
35881 G03
Total Bridge Rectifier Drop
vs Bridge Current
UVLO Falling vs Temperature
VSHUNT vs Temperature
4.2
4.0
3.8
3.6
3.4
3.2
3.0
2.8
21.0
20.8
20.6
20.4
20.2
20.0
19.8
19.6
19.4
19.2
19.0
1800
1600
1400
1200
1000
800
600
400
200
0
|V
– V | – V
PZ2
PZ1
IN
D1 = D0 = 1
–40°C
D1 = 1, D0 = 0
I
= 25mA
SHUNT
85°C
25°C
I
= 1mA
SHUNT
D1 = D0 = 0
–55 –35 –15
5
25 45 65 85 105 125
–55 –35 –15
5
25 45 65 85 105 125
1µ
10µ
100µ
1m
10m
TEMPERATURE (°C)
TEMPERATURE (°C)
BRIDGE CURRENT (A)
35881 G04
35881 G05
35881 G06
35881fc
4
For more information www.linear.com/LTC3588-1
LTC3588-1
TYPICAL PERFORMANCE CHARACTERISTICS
Bridge Leakage vs Temperature
Bridge Frequency Response
1.8V Output vs Temperature
20
18
16
14
12
10
8
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
1.85
1.80
1.75
1.70
1.65
1.60
4V APPLIED TO PZ1/PZ2 INPUT
P-P
MEASURED IN UVLO
V
= 18V, LEAKAGE AT PZ1 OR PZ2
IN
SLEEP THRESHOLD
WAKE-UP THRESHOLD
6
PGOOD FALLING
4
2
0
–55
–10
35
80
125
170
10 100 1k 10k 100k 1M 10M 100M
–55 –35 –15
5
25 45 65 85 105 125
TEMPERATURE (°C)
FREQUENCY (Hz)
TEMPERATURE (°C)
35881 G07
35881 G08
35881 G09
3.6V Output vs Temperature
2.5V Output vs Temperature
SLEEP THRESHOLD
3.3V Output vs Temperature
3.35
3.30
3.25
3.20
3.15
3.10
3.05
3.00
3.65
3.60
3.55
3.50
3.45
3.40
3.35
3.30
3.25
2.55
2.50
2.45
2.40
2.35
2.30
2.25
SLEEP THRESHOLD
SLEEP THRESHOLD
WAKE-UP THRESHOLD
WAKE-UP THRESHOLD
WAKE-UP THRESHOLD
PGOOD FALLING
PGOOD FALLING
PGOOD FALLING
–55 –35 –15
5
25 45 65 85 105 125
–55 –35 –15
5
25 45 65 85 105 125
–55 –35 –15
5
25 45 65 85 105 125
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
35881 G11
35881 G12
35881 G10
VOUT Load Regulation
VOUT Line Regulation
IVOUT vs Temperature
120
110
100
90
2.56
2.54
2.52
2.50
2.48
2.46
2.44
2.56
2.54
2.52
2.50
2.48
2.46
2.44
L = 10µH, I
= 100mA, D1 = 0, D0 = 1
V
= 5V, L = 10µH, D1 = 0, D0 = 1
LOAD
IN
V
V
= 3.6V
OUT
= 3.3V
OUT
80
70
V
V
= 2.5V
= 1.8V
OUT
60
50
OUT
40
30
20
–55 –35 –15
5
25 45 65 85 105 125
1µ
10µ
100µ
1m
10m
100m
4
6
8
10
V
12
(V)
14
16
18
TEMPERATURE (°C)
LOAD CURRENT (A)
IN
35881 G15
35881 G13
35881 G14
35881fc
5
For more information www.linear.com/LTC3588-1
LTC3588-1
TYPICAL PERFORMANCE CHARACTERISTICS
RDS(ON) of PMOS/NMOS
vs Temperature
IPEAK vs Temperature
Operating Waveforms
2.0
1.8
1.6
1.4
1.2
1.0
0.8
300
290
280
270
260
250
240
230
220
210
200
OUTPUT
VOLTAGE
50mV/DIV
AC-COUPLED
NMOS
PMOS
SWITCH
VOLTAGE
2V/DIV
0V
INDUCTOR
CURRENT
200mA/DIV
0mA
35881 G18
–55 –35 –15
5
25 45 65 85 105 125
–55 –35 –15
5
25 45 65 85 105 125
5µs/DIV
V
= 5V, V
= 3.3V
TEMPERATURE (°C)
TEMPERATURE (°C)
IN
OUT
35881 G17
35881 G16
I
= 1mA
LOAD
L = 10µH, C
= 47µF
OUT
Efficiency vs VIN for
ILOAD = 100mA, L = 10µH
Efficiency vs VIN for
VOUT = 3.3V, L = 10µH
Efficiency vs ILOAD, L = 10µH
95
85
75
65
55
45
35
100
90
80
70
60
50
40
100
90
80
70
60
50
40
30
20
10
0
V
= 5V
IN
I
I
I
I
I
= 100mA
= 100µA
= 50µA
= 30µA
= 10µA
LOAD
LOAD
LOAD
LOAD
LOAD
V
= 3.6V
= 3.3V
= 2.5V
= 1.8V
V
V
V
V
= 3.6V
= 3.3V
= 2.5V
= 1.8V
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
V
V
V
4
6
8
10
12
(V)
14
16
18
2
4
6
8
10 12 14 16 18
(V)
1µ
10µ
100µ
LOAD CURRENT (A)
1m
10m
100m
V
V
IN
IN
35881 G21
35881 G20
35881 G19
Efficiency vs VIN for
ILOAD = 100mA, L = 100µH
Efficiency vs VIN for
VOUT = 3.3V, L = 100µH
Efficiency vs ILOAD, L = 100µH
95
85
75
65
55
45
35
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
V
= 5V
IN
I
I
I
I
I
= 100mA
= 100µA
= 50µA
= 30µA
= 10µA
LOAD
LOAD
LOAD
LOAD
LOAD
V
V
V
V
= 3.6V
= 3.3V
= 2.5V
= 1.8V
V
V
V
V
= 3.6V
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
= 3.3V
= 2.5V
= 1.8V
4
6
8
10
12
(V)
14
16
18
1µ
10µ
100µ
LOAD CURRENT (A)
1m
10m
100m
2
4
6
8
10 12 14 16 18
(V)
V
V
IN
IN
35881 G24
35881 G22
35881 G23
35881fc
6
For more information www.linear.com/LTC3588-1
LTC3588-1
PIN FUNCTIONS
PZ1 (Pin 1): Input connection for piezoelectric element or
other AC source (used in conjunction with PZ2).
V
(Pin 7): Internal low voltage rail to serve as gate drive
IN2
for buck NMOS switch. Also serves as a logic high rail for
output voltage select bits D0 and D1. A 4.7µF capacitor
PZ2 (Pin 2): Input connection for piezoelectric element or
other AC source (used in conjunction with PZ1).
should be connected from V to GND. This pin is not
IN2
intended for use as an external system rail.
CAP (Pin 3): Internal rail referenced to V to serve as gate
IN
D1 (Pin 8): Output Voltage Select Bit. D1 should be tied
drive for buck PMOS switch. A 1µF capacitor should be
high to V or low to GND to select desired V
(see
IN2
OUT
connected between CAP and V . This pin is not intended
IN
Table 1).
for use as an external system rail.
D0 (Pin 9): Output Voltage Select Bit. D0 should be tied
V
(Pin 4): Rectified Input Voltage. A capacitor on this
IN
high to V or low to GND to select desired V
(see
IN2
OUT
pin serves as an energy reservoir and input supply for the
Table 1).
buck regulator. The V voltage is internally clamped to a
maximum of 20V (typical).
IN
PGOOD (Pin 10): Power good output is logic high when
is above 92% of the target value. The logic high is
V
OUT
SW (Pin 5): Switch Pin for the Buck Switching Regulator.
referenced to the V
rail.
OUT
A 10µH or larger inductor should be connected from SW
to V
.
GND (Exposed Pad Pin 11): Ground. The Exposed Pad
should be connected to a continuous ground plane on the
second layer of the printed circuit board by several vias
directly under the LTC3588-1.
OUT
V
(Pin 6): Sense pin used to monitor the output volt-
OUT
age and adjust it through internal feedback.
BLOCK DIAGRAM
4
V
IN
20V
INTERNAL RAIL
GENERATION
3
5
7
CAP
SW
1
2
PZ1
PZ2
V
IN2
BUCK
CONTROL
UVLO
GND
11
SLEEP
BANDGAP
REFERENCE
V
6
OUT
8, 9
D1, D0
2
PGOOD
COMPARATOR
10
PGOOD
35881 BD
35881fc
7
For more information www.linear.com/LTC3588-1
LTC3588-1
OPERATION
The LTC3588-1 is an ultralow quiescent current power
supply designed specifically for energy harvesting and/or
lowcurrentstep-downapplications.Thepartisdesignedto
interfacedirectlytoapiezoelectricoralternativeA/Cpower
source, rectify a voltage waveform and store harvested
energyonanexternalcapacitor,bleedoffanyexcesspower
via an internal shunt regulator, and maintain a regulated
output voltage by means of a nanopower high efficiency
synchronous buck regulator.
Internal Rail Generation
Twointernalrails,CAPandV ,aregeneratedfromV and
IN2
IN
are used to drive the high side PMOS and low side NMOS
of the buck converter, respectively. Additionally the V
IN2
rail serves as logic high for output voltage select bits D0
and D1. The V rail is regulated at 4.8V above GND while
IN2
the CAP rail is regulated at 4.8V below V . These are not
IN
intended to be used as external rails. Bypass capacitors
are connected to the CAP and V pins to serve as energy
IN2
reservoirsfordrivingthebuckswitches.WhenV isbelow
IN
Internal Bridge Rectifier
4.8V, V is equal to V and CAP is held at GND. Figure 1
IN2
IN
The LTC3588-1 has an internal full-wave bridge rectifier
accessible via the differential PZ1 and PZ2 inputs that
rectifies AC inputs such as those from a piezoelectric
element. The rectified output is stored on a capacitor at
shows the ideal V , V and CAP relationship.
IN IN2
18
16
14
the V pin and can be used as an energy reservoir for the
IN
V
IN
buck converter. The low-loss bridge rectifier has a total
dropofabout400mVwithtypicalpiezogeneratedcurrents
(~10µA). The bridge is capable of carrying up to 50mA.
One side of the bridge can be operated as a single-ended
DC input. PZ1 and PZ2 should never be shorted together
when the bridge is in use.
12
10
8
6
V
IN2
4
CAP
2
0
0
5
10
(V)
15
Undervoltage Lockout (UVLO)
V
IN
35881 F01
When the voltage on V rises above the UVLO rising
IN
Figure 1. Ideal VIN, VIN2 and CAP Relationship
threshold the buck converter is enabled and charge is
transferred from the input capacitor to the output capaci-
tor. A wide (~1V) UVLO hysteresis window is employed
with a lower threshold approximately 300mV above the
selected regulated output voltage to prevent short cycling
during buck power-up. When the input capacitor voltage
is depleted below the UVLO falling threshold the buck
converter is disabled. Extremely low quiescent current
(450nA typical) in UVLO allows energy to accumulate on
the input capacitor in situations where energy must be
harvested from low power sources.
Buck Operation
The buck regulator uses a hysteretic voltage algorithm to
controltheoutputthroughinternalfeedbackfromtheV
OUT
sense pin. The buck converter charges an output capaci-
tor through an inductor to a value slightly higher than the
regulationpoint.Itdoesthisbyrampingtheinductorcurrent
up to 260mA through an internal PMOS switch and then
rampingitdownto0mAthroughaninternalNMOSswitch.
Thisefficientlydeliversenergytotheoutputcapacitor. The
ramprateisdeterminedbyV ,V ,andtheinductorvalue.
IN OUT
If the input voltage falls below the UVLO falling threshold
35881fc
8
For more information www.linear.com/LTC3588-1
LTC3588-1
OPERATION
Table 1. Output Voltage Selection
before the output voltage reaches regulation, the buck
converter will shut off and will not be turned on until the
input voltage again rises above the UVLO rising threshold.
During this time the output voltage will be loaded by less
than 100nA. When the buck brings the output voltage into
regulation the converter enters a low quiescent current
sleep state that monitors the output voltage with a sleep
comparator. During this operating mode load current is
provided by the buck output capacitor. When the output
voltage falls below the regulation point the buck regulator
wakes up and the cycle repeats. This hysteretic method
of providing a regulated output reduces losses associated
with FET switching and maintains an output at light loads.
The buck delivers a minimum of 100mA of average load
current when it is switching.
D1
0
D0
0
V
V
QUIESCENT CURRENT (I
)
OUT
OUT
VOUT
1.8V
2.5V
3.3V
3.6V
44nA
62nA
81nA
89nA
0
1
1
0
1
1
The internal feedback network draws a small amount of
current from V as listed in Table 1.
OUT
Power Good Comparator
Apowergoodcomparatorproducesalogichighreferenced
to V
on the PGOOD pin the first time the converter
OUT
reaches the sleep threshold of the programmed V
,
OUT
signaling that the output is in regulation. The PGOOD pin
will remain high until V falls to 92% of the desired
OUT
When the sleep comparator signals that the output has
reached the sleep threshold the buck converter may be
in the middle of a cycle with current still flowing through
the inductor. Normally both synchronous switches would
turn off and the current in the inductor would freewheel
to zero through the NMOS body diode. The LTC3588-1
keeps the NMOS switch on during this time to prevent the
conduction loss that would occur in the diode if the NMOS
were off. If the PMOS is on when the sleep comparator
trips the NMOS will turn on immediately in order to ramp
down the current. If the NMOS is on it will be kept on until
the current reaches zero.
regulation voltage. Several sleep cycles may occur during
thistime.Additionally,ifPGOODishighandV fallsbelow
IN
the UVLO falling threshold, PGOOD will remain high until
V
falls to 92% of the desired regulation point. This
OUT
allows output energy to be used even if the input is lost.
Figure 2 shows the behavior for V
= 3.6V and no load.
OUT
At t = 75s V becomes high impedance and is discharged
IN
by the quiescent current of the LTC3588-1 and through
servicing V
which is discharged by its own leakage
OUT
current.V crossesUVLOfallingbutPGOODremainshigh
IN
untilV decreasesto92%ofthedesiredregulationpoint.
OUT
The PGOOD pin is designed to drive a microprocessor or
other chip I/O and is not intended to drive higher current
loads such as an LED.
Though the quiescent current when the buck is switching
is much greater than the sleep quiescent current, it is still
a small percentage of the average inductor current which
results in high efficiency over most load conditions. The
buck operates only when sufficient energy has been ac-
cumulated in the input capacitor and the length of time the
converter needs to transfer energy to the output is much
less than the time it takes to accumulate energy. Thus, the
buck operating quiescent current is averaged over a long
period of time so that the total average quiescent current
is low. This feature accommodates sources that harvest
small amounts of ambient energy.
6
C
= C
= 100µF
VOUT
VIN
5
4
3
2
1
0
V
IN
V
= UVLO FALLING
IN
V
OUT
PGOOD
200
Four selectable voltages are available by tying the output
0
100
300
. Table 1 shows the
select bits, D0 and D1, to GND or V
IN2
TIME (s)
35881 F02
fourD0/D1codesandtheircorrespondingoutputvoltages.
Figure 2. PGOOD Operation During Transition to UVLO
35881fc
9
For more information www.linear.com/LTC3588-1
LTC3588-1
OPERATION
The D0/D1 inputs can be switched while in regulation as
Energy Storage
showninFigure3. IfV
isprogrammedtoavoltagewith
OUT
Harvested energy can be stored on the input capacitor
or the output capacitor. The wide input range takes ad-
vantage 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
efficiently transfer energy stored at a high voltage to the
regulatedoutput. Whileenergystorageattheinpututilizes
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.
aPGOODfallingthresholdabovetheoldV , PGOODwill
OUT
transition low until the new regulation point is reached.
When V
is programmed to a lower voltage, PGOOD
OUT
will remain high through the transition.
5
C
= 100µF, I
= 100mA
LOAD
OUT
D1=D0=0
D1=D0=1
D1=D0=0
4
3
2
1
0
V
OUT
PGOOD = LOGIC1
0
2
4
6
8
10 12 14 16 18 20
TIME (ms)
35881 F03
Figure 3. PGOOD Operation During D0/D1 Transition
35881fc
10
For more information www.linear.com/LTC3588-1
LTC3588-1
APPLICATIONS INFORMATION
Introduction
The LTC3588-1 is well-suited to a piezoelectric energy
harvesting application. The 20V input protective shunt
can accommodate a variety of piezoelectric elements. The
low quiescent current of the LTC3588-1 enables efficient
energy accumulation from piezoelectric elements which
can have short-circuit currents on the order of tens of
microamps. Piezoelectric elements can be obtained from
manufacturers listed in Table 2.
The LTC3588-1 harvests ambient vibrational energy
through a piezoelectric element in its primary application.
Common piezoelectric elements are PZT (lead zirconate
titanate) ceramics, PVDF (polyvinylidene fluoride) poly-
mers,orothercomposites.Ceramicpiezoelectricelements
exhibit a piezoelectric effect when the crystal structure
of the ceramic is compressed and internal dipole move-
ment produces a voltage. Polymer elements comprised
of long-chain molecules produce a voltage when flexed
as molecules repel each other. Ceramics are often used
under direct pressure while a polymer can be flexed more
readily. A wide range of piezoelectric elements are avail-
able and produce a variety of open-circuit voltages and
short-circuit currents. Typically the open-circuit voltage
and short-circuit currents increase with available vibra-
tional energy as shown in Figure 4. Piezoelectric elements
can be placed in series or in parallel to achieve desired
open-circuit voltages.
Table 2. Piezoelectric Element Manufacturers
Advanced Cerametrics
Piezo Systems
www.advancedcerametrics.com
www.piezo.com
Measurement Specialties
PI (Physik Instrumente)
MIDE Technology Corporation
Morgan Technical Ceramics
www.meas-spec.com
www.pi-usa.us
www.mide.com
www.morganelectroceramics.com
The LTC3588-1 will gather energy and convert it to a use-
able output voltage to power microprocessors, wireless
sensors, and wireless transmission components. Such a
wireless sensor application may require much more peak
powerthanapiezoelectricelementcanproduce.However,
the LTC3588-1 accumulates energy over a long period of
time to enable efficient use for short power bursts. For
continuous operation, these bursts must occur with a low
dutycyclesuchthatthetotaloutputenergyduringtheburst
doesnotexceedtheaveragesourcepowerintegratedover
an energy accumulation cycle. For piezoelectric inputs the
time between cycles could be minutes, hours, or longer
depending on the selected capacitor values and the nature
of the vibration source.
12
9
INCREASING
VIBRATION ENERGY
6
3
0
0
10
20
30
PIEZO CURRENT (µA)
35881 F04
Figure 4. Typical Piezoelectric Load Lines
for Piezo Systems T220-A4-503X
35881fc
11
For more information www.linear.com/LTC3588-1
LTC3588-1
APPLICATIONS INFORMATION
MIDE V21BL
OUTPUT
VOLTAGE
PZ1
PZ2
20mV/DIV
V
PGOOD
T
EN
IN
X
AC-COUPLED
1µF
6V
MICROPROCESSOR
10µH
3.3V
LTC3588-1
CAP
SW
OUT
10µF
25V
CORE
GND
LOAD
CURRENT
25mA/DIV
V
V
IN2
D1
D0
47µF
6V
4.7µF
6V
GND
5mA
35881 F05a
35881 F05b
250µs/DIV
= 47µF
V
= 5V
IN
L = 10µH, C
OUT
LOAD STEP BETWEEN 5mA and 55mA
Figure 5. 3.3V Piezoelectric Energy Harvester Powering a Microprocessor
with a Wireless Transmitter and 50mA Load Step Response
PGOOD Signal
The PGOOD signal can be used to enable a sleeping
should be stored on the input so that the buck does not
reach the UVLO falling threshold which would halt energy
transfer to the output. In general:
microprocessor or other circuitry when V
reaches
OUT
1
2
regulation, as shown in Figure 5. Typically V will be
2
IN
P
LOADtLOAD = ηCIN
V
2 − VU
(
)
IN
VLOFALLING
somewhere between the UVLO thresholds at this time
and a load could only be supported by the output capaci-
tor. Alternatively, waiting a period of time after PGOOD
goes high would let the input capacitor accumulate more
energy allowing load current to be maintained longer as
the buck efficiently transfers that energy to the output.
While active, a microprocessor may draw a small load
when operating sensors, and then draw a large load to
transmit data. Figure 5 shows the LTC3588-1 responding
smoothly to such a load step.
VUVLOFALLING ≤ V ≤ V
IN
SHUNT
The above equation can be used to size the input capaci-
tor to meet the power requirements of the output for the
desired duration. Here η is the average efficiency of the
buck converter over the input range and V is the input
IN
voltage when the buck begins to switch. This equation
mayoverestimatetheinputcapacitornecessarysinceload
current can deplete the output capacitor all the way to the
lower PGOOD threshold. It also assumes that the input
source charging has a negligible effect during this time.
Input and Output Capacitor Selection
The input and output capacitors should be selected based
on the energy needs and load requirements of the ap-
The duration for which the regulator sleeps depends on
the load current and the size of the output capacitor. The
sleep time decreases as the load current increases and/or
astheoutputcapacitordecreases.TheDCsleephysteresis
window is 12mV around the programmed output volt-
age. Ideally this means that the sleep time is determined
by the following equation:
plication. In every case the V capacitor should be rated
IN
to withstand the highest voltage ever present at V .
IN
For 100mA or smaller loads, storing energy at the input
takes advantage of the high voltage input since the buck
can deliver 100mA average load current efficiently to the
output. The input capacitor should then be sized to store
enough energy to provide output power for the length of
time required. This may involve using a large capacitor,
24mV
t
SLEEP =COUT
ILOAD
lettingV chargetoahighvoltage,orboth.Enoughenergy
IN
35881fc
12
For more information www.linear.com/LTC3588-1
LTC3588-1
APPLICATIONS INFORMATION
This is true for output capacitors on the order of 100µF
or larger, but as the output capacitor decreases towards
10µF delays in the internal sleep comparator along with
DCR should be evaluated. Table 3 lists several inductors
that work well with the LTC3588-1.
Table 3. Recommended Inductors for LTC3588-1
MAX MAX
the load current may result in the V
voltage slewing
OUT
past the 12mV thresholds. This will lengthen the sleep
time and increase V ripple. A capacitor less than 10µF
INDUCTOR
TYPE
L
I
DCR
(Ω)
SIZE in mm
MANU-
FACTURER
DC
(µH) (mA)
(L × W × H)
OUT
is not recommended as V
ripple could increase to an
CDRH2D18/LDNP 10
430 0.180
3 × 3 × 2
Sumida
Toko
OUT
undesirable level.
107AS-100M
10
10
650 0.145 2.8 × 3 × 1.8
350 0.301 2.8 × 3 × 1.5
1000 0.130 3.2 × 2.5 × 1.0
490 0.611 2.0 × 1.9 × 1.0
500 0.250 7.0 × 7.0 × 4.5
EPL3015-103ML
MLP3225s100L
XLP2010-163ML
SLF7045T
Coilcraft
TDK
Iftransientloadcurrentsabove100mAarerequiredthena
larger capacitor can be used at the output. This capacitor
willbecontinuouslydischargedduringaloadconditionand
10
10
Coilcraft
TDK
100
the capacitor can be sized for an acceptable drop in V
:
OUT
tLOAD
VOUT+ – VOUT
V
IN2
and CAP Capacitors
COUT = (ILOAD – IBUCK
)
–
A 1μF capacitor should be connected between V and
IN
CAP and a 4.7µF capacitor should be connected between
IN2
+
Here V
is the value of V
when PGOOD goes high
OUT
OUT
V
and GND. These capacitors hold up the internal rails
–
and V
is the desired lower limit of V . I
is the
OUT
OUT BUCK
during buck switching and compensate the internal rail
generation circuits. In applications where the input source
is limited to less than 6V, the CAP pin can be tied to GND
average current being delivered from the buck converter,
typically I /2.
PEAK
and the V pin can be tied to V as shown in Figure 6.
A standard surface mount ceramic capacitor can be used
for C , though some applications may be better suited
to a low leakage aluminum electrolytic capacitor or a
supercapacitor. These capacitors can be obtained from
manufacturers such as Vishay, Illinois Capacitor, AVX,
or CAP-XX.
IN2
IN
An optional 5.6V Zener diode can be connected to V to
IN
OUT
clamp V in this scenario. The leakage of the Zener diode
IN
below its Zener voltage should be considered as it may be
comparable to the quiescent current of the LTC3588-1.
This circuit does not require the capacitors on V and
IN2
CAP, saving components and allowing a lower voltage
rating for the single V capacitor.
Inductor
IN
The buck is optimized to work with an inductor in the
range of 10µH to 22µH, although inductor values outside
this range may yield benefits in some applications. For
typical applications, a value of 10µH is recommended. A
larger inductor will benefit high voltage applications by
increasing the on-time of the PMOS switch and improv-
ing efficiency by reducing gate charge loss. Choose an
inductor with a DC current rating greater than 350mA. The
DCR of the inductor can have an impact on efficiency as
it is a source of loss. Trade-offs between price, size, and
MIDE V21BL
PZ1
PZ2
PGOOD
V
V
PGOOD
IN
IN2
10µH
LTC3588-1
V
OUT
10µF
6V
CAP
D1
SW
OUT
1.8V
5.6V
(OPTIONAL)
V
10µF
6V
D0
GND
35881 F06
Figure 6. Smallest Solution Size 1.8V Low Voltage Input
Piezoelectric Power Supply
35881fc
13
For more information www.linear.com/LTC3588-1
LTC3588-1
APPLICATIONS INFORMATION
Additional Applications with Piezo Inputs
A piezo powered LTC3588-1 can also be used in concert
with a battery connected to V to supplement the system
IN
The versatile LTC3588-1 can be used in a variety of con-
figurations.Figure7showsasinglepiezosourcepowering
two LTC3588-1s simultaneously, providing capability for
multiple rail systems. This setup features automatic sup-
ply sequencing as the LTC3588-1 with the lower voltage
output(i.e.lowerUVLOrisingthreshold)willcomeupfirst.
if ambient vibrational energy ceases as shown in Figure 8.
A blocking diode placed in series with the battery to
V
prevents reverse current in the battery if the piezo
IN
source charges V past the battery voltage. A 9V battery
IN
is shown, but any stack of batteries of a given chemistry
can be used as long as the battery stack voltage does not
exceed 18V. In this setup the presence of the piezo energy
harvester can greatly increase the life of the battery. If the
piezo source is removed the LTC3588-1 can serve as a
standalone nanopower buck converter. In this case the
bridge is unused and the blocking diode is unnecessary.
AsthepiezoprovidesinputpowerbothV railswillinitially
IN
come up together, but when one output starts drawing
power, only its corresponding V will fall as the bridges
IN
of each LTC3588-1 provide isolation. Input piezo energy
will then be directed to this lower voltage capacitor until
bothV railsareagainequal.Thisconfigurationisexpand-
IN
able to any number of LTC3588-1s powered by a single
piezo as long as the piezo can support the sum total of
the quiescent currents from each LTC3588-1.
MIDE V25W
PZ1
PZ2
PZ1
PZ2
PGOOD1
10µH
PGOOD2
10µH
PGOOD
V
V
PGOOD
IN
IN
1µF
6V
1µF
6V
LTC3588-1
LTC3588-1
3.6V
1.8V
SW
CAP
CAP
SW
OUT
10µF
25V
10µF
25V
V
OUT
V
V
IN2
V
IN2
D1
10µF
6V
10µF
6V
D1
D0
4.7µF
6V
4.7µF
6V
D0
GND
GND
35881 F07
Figure 7. Dual Rail Power Supply with Single Piezo and
Automatic Supply Sequencing
PIEZO SYSTEMS T220-A4-503X
IR05H40CSPTR
PZ1
PZ2
PGOOD
10µH
V
PGOOD
IN
1µF
6V
LTC3588-1
V
OUT
CAP
SW
OUT
3.3V
100µF
16V
V
V
IN2
9V
BATTERY
47µF
6V
D1
D0
4.7µF
6V
GND
35881 F08
Figure 8. Piezo Energy Harvester with Battery Backup
35881fc
14
For more information www.linear.com/LTC3588-1
LTC3588-1
APPLICATIONS INFORMATION
DANGER! HIGH VOLTAGE!
DANGEROUS AND LETHAL POTENTIALS ARE PRESENT IN OFFLINE CIRCUITS!
150k
150k
BEFORE PROCEEDING ANY FURTHER, THE READER IS WARNED THAT
CAUTION MUST BE USED IN THE CONSTRUCTION, TESTING AND USE OF
OFFLINE CIRCUITS. EXTREME CAUTION MUST BE USED IN WORKING WITH
AND MAKING CONNECTIONS TO THESE CIRCUITS. REPEAT: OFFLINE
CIRCUITS CONTAIN DANGEROUS, AC LINE-CONNECTED HIGH VOLTAGE
POTENTIALS. USE CAUTION. ALL TESTING PERFORMED ON AN OFFLINE
CIRCUIT MUST BE DONE WITH AN ISOLATION TRANSFORMER CONNECTED
BETWEEN THE OFFLINE CIRCUIT’S INPUT AND THE AC LINE. USERS AND
CONSTRUCTORS OF OFFLINE CIRCUITS MUST OBSERVE THIS PRECAUTION
WHEN CONNECTING TEST EQUIPMENT TO THE CIRCUIT TO AVOID ELECTRIC
SHOCK. REPEAT: AN ISOLATION TRANSFORMER MUST BE CONNECTED
BETWEEN THE CIRCUIT INPUT AND THE AC LINE IF ANY TEST EQUIPMENT IS
TO BE CONNECTED.
120VAC
60Hz
150k
150k
PZ1
PZ2
PGOOD
10µH
V
PGOOD
IN
1µF
6V
LTC3588-1
V
OUT
CAP
SW
OUT
3.6V
10µF
25V
V
V
IN2
100µF
6V
D1
D0
4.7µF
6V
GND
35881 F09
Figure 9. AC Line Powered 3.6V Buck Regulator with
Large Output Capacitor to Support Heavy Loads
PANELS ARE PLACED 6"
COPPER PANEL
(12" × 24")
COPPER PANEL
(12" × 24")
FROM 2' × 4' FLUORESCENT
LIGHT FIXTURES
PZ1
PZ2
PGOOD
10µH
V
PGOOD
IN
1µF
6V
LTC3588-1
3.3V
CAP
SW
OUT
10µF
25V
V
V
IN2
10µF
6V
D1
D0
4.7µF
6V
GND
35881 F10
Figure 10. Electric Field Energy Harvester
Alternate Power Sources
harvest energy from the electric field around the light. The
frequency of the emission will be 120Hz for magnetic bal-
lastsbutcouldbehigherifthelightuseselectronicballast.
The LTC3588-1 bridge rectifier can handle a wide range
of input frequencies.
The LTC3588-1 is not limited to use with piezoelectric ele-
mentsbutcanaccommodateawidevarietyofinputsources
dependingonthetypeofambientenergyavailable.Figure9
shows the LTC3588-1 internal bridge rectifier connected
to the AC line in series with four 150k current limiting
resistors. This is a high voltage application and minimum
spacing between the line, neutral, and any high voltage
components should be maintained per the applicable UL
specification. For general off-line applications refer to UL
regulation 1012.
The LTC3588-1 can also be configured for use with DC
sources such as a solar panel or thermal couple as shown
in Figures 11 and 12 by connecting them to one of the
PZ1/PZ2 inputs. Connecting the two sources in this way
prevents reverse current from flowing in each element.
Current limiting resistors should be used to protect the
PZ1 or PZ2 pins. This can be combined with a battery
Figure 10 shows an application where copper panels are
placednearastandardfluorescentroomlighttocapacitively
backup connected to V with a blocking diode.
IN
35881fc
15
For more information www.linear.com/LTC3588-1
LTC3588-1
APPLICATIONS INFORMATION
300Ω
PZ1
PZ2
IR05H4OCSPTR
V
PGOOD
PGOOD
10µH
IN
1µF
6V
LTC3588-1
+
–
5V TO 16V
SOLAR PANEL
V
OUT
2.5V
CAP
SW
OUT
100µF
25V
9V
BATTERY
V
V
IN2
+
3F
2.7V
D0
D1
4.7µF
6V
10µF
6V
GND
NESS SUPER CAPACITOR
ESHSR-0003CO-002R7
35881 F11
Figure 11. 5V to 16V Solar-Powered 2.5V Supply with Supercapacitor for
Increased Output Energy Storage and Battery Backup
R , 5.2Ω 100Ω
S
PZ1
PZ2
PG-1 THERMAL
GENERATOR
P/N G1-1.0-127-1.27
(TELLUREX)
∆T = 100°C
V
PGOOD
PGOOD
10µH
IN
1µF
6V
LTC3588-1
V
OUT
CAP
SW
OUT
5.4V
1µF
16V
2.5V
V
V
IN2
47µF
6V
D0
D1
4.7µF
6V
GND
35881 F12
Figure 12. Thermoelectric Energy Harvester
PZ2
PGOOD
LTC3588-1
PZ1
V
IN
1µF
6V
22µH
3.3V
V
SW
OUT
CAP
IN
10µF
25V
1µF
6V
PGOOD
V
V
47µF
6V
IN2
LTC3388-3
*
CAP
D1
D0
22µH
2.2µF
10V
4.7µF
6V
SW
OUT
V
IN2
GND
V
EN
D1
D0
47µF
6V
4.7µF
6V
STBY
GND
–3.3V
33881 TA03
* EXPOSED PAD MUST BE ELECTRICALLY ISOLATED FROM
SYSTEM GROUND AND CONNECTED TO THE –3.3V RAIL.
Figure 13. Piezoelectric Energy Harvester with 3.3V Outputs
35881fc
16
For more information www.linear.com/LTC3588-1
LTC3588-1
PACKAGE DESCRIPTION
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
DD Package
10-Lead Plastic DFN (3mm × 3mm)
(Reference LTC DWG # 05-08-1699 Rev C)
0.70 ±0.05
3.55 ±0.05
2.15 ±0.05 (2 SIDES)
1.65 ±0.05
PACKAGE
OUTLINE
0.25 ± 0.05
0.50
BSC
2.38 ±0.05
(2 SIDES)
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
R = 0.125
0.40 ± 0.10
TYP
6
10
3.00 ±0.10
(4 SIDES)
1.65 ± 0.10
(2 SIDES)
PIN 1 NOTCH
R = 0.20 OR
PIN 1
TOP MARK
(SEE NOTE 6)
0.35 × 45°
CHAMFER
(DD) DFN REV C 0310
5
1
0.25 ± 0.05
0.50 BSC
0.75 ±0.05
0.200 REF
2.38 ±0.10
(2 SIDES)
0.00 – 0.05
BOTTOM VIEW—EXPOSED PAD
NOTE:
1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-2).
CHECK THE LTC WEBSITE DATA SHEET FOR CURRENT STATUS OF VARIATION ASSIGNMENT
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE
TOP AND BOTTOM OF PACKAGE
35881fc
17
For more information www.linear.com/LTC3588-1
LTC3588-1
PACKAGE DESCRIPTION
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
MSE Package
10-Lead Plastic MSOP, Exposed Die Pad
(Reference LTC DWG # 05-08-1664 Rev I)
BOTTOM VIEW OF
EXPOSED PAD OPTION
1.88
(.074)
1.88 ±0.102
(.074 ±.004)
0.889 ±0.127
(.035 ±.005)
1
0.29
REF
1.68
(.066)
0.05 REF
5.10
(.201)
MIN
1.68 ±0.102
3.20 – 3.45
DETAIL “B”
(.066 ±.004) (.126 – .136)
CORNER TAIL IS PART OF
THE LEADFRAME FEATURE.
FOR REFERENCE ONLY
DETAIL “B”
10
NO MEASUREMENT PURPOSE
0.50
(.0197)
BSC
0.305 ± 0.038
(.0120 ±.0015)
TYP
3.00 ±0.102
(.118 ±.004)
(NOTE 3)
0.497 ±0.076
(.0196 ±.003)
10 9
8
7 6
RECOMMENDED SOLDER PAD LAYOUT
REF
3.00 ±0.102
(.118 ±.004)
(NOTE 4)
4.90 ±0.152
(.193 ±.006)
DETAIL “A”
0.254
(.010)
0° – 6° TYP
1
2
3
4 5
GAUGE PLANE
0.53 ±0.152
(.021 ±.006)
0.86
(.034)
REF
1.10
(.043)
MAX
DETAIL “A”
0.18
(.007)
SEATING
PLANE
0.17 – 0.27
(.007 – .011)
TYP
0.1016 ±0.0508
(.004 ±.002)
0.50
(.0197)
BSC
MSOP (MSE) 0213 REV I
NOTE:
1. DIMENSIONS IN MILLIMETER/(INCH)
2. DRAWING NOT TO SCALE
3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
6. EXPOSED PAD DIMENSION DOES INCLUDE MOLD FLASH. MOLD FLASH ON E-PAD
SHALL NOT EXCEED 0.254mm (.010") PER SIDE.
35881fc
18
For more information www.linear.com/LTC3588-1
LTC3588-1
REVISION HISTORY
REV
DATE
DESCRIPTION
PAGE NUMBER
A
9/10
Updated/added part number on the Piezoelectric Transducer on the front and back page applications, and Figures 5,
6 and 7
1, 12, 13,
14, 20
Updated Temperature Range in Order Information
2
3
Changed T = 25°C to T = 25°C and I
to I
in Electrical Characteristics
J
A
LOAD
BUCK
Updated Notes 2, 3 and 4
4
Updated G21 in Typical Performance Characteristics
Added Figure 13
6
16
20
1
Updated Related Parts
B
C
7/14
8/15
Clarified title and Description
Clarified x-axis label on Figure 1
Clarified Figure 8
8
14
20
13
Clarified Related Parts list
Modified C
Equation
OUT
35881fc
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-
19
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
LTC3588-1
TYPICAL APPLICATION
Peak-to-Peak Output Ripple vs COUT1
Piezoelectric 3.3V Power Supply with LDO
Post Regulator for Reduced Output Ripple
120
100
80
60
40
20
0
C
= 1µF
OUT2
ADVANCED CERAMETRICS PFCB-W14
V
V
(LTC3588-1)
OUT1
OUT2
PZ1
PZ2
V
PGOOD
SHDN
LT3009-3.3
IN
V
1µF
6V
OUT1
10µH
V
3.6V
OUT2
LTC3588-1
CAP
SW
OUT
3.3V
IN
OUT
47µF
25V
20mA
V
V
IN2
GND
(LT3009-3.3)
100
D1
D0
C
10µF
6V
C
OUT2
4.7µF
6V
OUT1
1µF
GND
6V
10
C
(µF)
OUT1
35881 TA02a
35881 TA02b
RELATED PARTS
PART NUMBER DESCRIPTION
COMMENTS
LT1389
LTC1540
LT3009
Nanopower Precision Shunt Voltage Reference
Nanopower Comparator with Reference
800nA Operating Current, 1.25V/2.5V/4.096V
0.3µA I , Drives 0.01µF, Adjustable Hysteresis, 2V to 11V Input Range
Q
3µA I , 20mA Low Dropout Linear Regulator
Low 3µA I , 1.6V to 20V Range, 20mA Output Current
Q
Q
LTC3388-1/
LTC3388-3
20V High Efficiency Nanopower Step-Down Regulator
860nA I in Sleep, 2.7V to 20V Input, V : 1.2V to 5.0V, Enable and
Q
OUT
Standby Pins
LTC3588-2
Nanopower Energy Harvesting Power Supply
<1µA I in Regulation, UVLO Rising = 16V, UVLO Falling = 14V,
Q
OUT
V
= 3.45V, 4.1V, 4.5V 5.0V
LT3652
LT3970
LT3971
LT3991
LTC3631
LTC3642
LTC3330
Power Tracking 2A Battery Charger for Solar Power
MPPT for Solar, 4.95V to 32V, Up to 2A Charge Current
40V, 350mA Step-Down Regulator with 2.5µA I
Integrated Boost and Catch Diodes, 4.2V to 40V Operating Range
4.3V to 38V Operating Range, Low Ripple Burst Mode® Operation
4.3V to 55V Operating Range, Low Ripple Burst Mode Operation
4.5V to 45V Operating Range, Overvoltage Lockout Up to 60V
4.5V to 45V Operating Range, Overvoltage Lockout Up to 60V
Q
38V, 1.2A, 2MHz Step-Down Regulator with 2.8µA I
Q
55V, 1.2A 2MHz Step-Down Regulator with 2.8µA I
Q
45V, 100mA, Synchronous Step-Down Regulator with 12µA I
Q
45V, 50mA, Synchronous Step-Down Regulator with 12µA I
Q
Nanopower Buck-Boost DC/DC with Energy Harvesting Battery V : 2.7V to 20V, BAT: 1.8V to 5.5V, 750nA I , 5mm × 5mm
Life Extender
IN
Q
QFN-32 Package
LTC3331
Nanopower Buck-Boost DC/DC with Energy Harvesting Battery V : 2.7V to 20V, BAT: Up to 4.2V, Shunt Charger, Low Battery
IN
Charger
Disconnect, 950nA I , 5mm × 5mm QFN-32 Package
Q
35881fc
LT 0815 REV C • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
20
●
●
(408)432-1900 FAX: (408) 434-0507 www.linear.com/LTC3588-1
LINEAR TECHNOLOGY CORPORATION 2010
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