|
|
PDF LTC3335 Data sheet ( Hoja de datos )
| Número de pieza | LTC3335 | |
| Descripción | Nanopower Buck-Boost DC/DC | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de LTC3335 (archivo pdf) en la parte inferior de esta página. Total 28 Páginas | ||
|
No Preview Available !
Features
n 680nA Input Quiescent Current (Output in
Regulation at No Load)
n 1.8V to 5.5V Input Operating Range
n Selectable Output Voltages of 1.8V, 2.5V, 2.8V,
3V, 3.3V, 3.6V, 4.5V, 5V
n Integrated Coulomb Counter Measures
Accumulated Battery Discharge
n ±5% Battery Discharge Measurement Accuracy
n Programmable Peak Input Current of 5mA, 10mA,
15mA, 25mA, 50mA, 100mA, 150mA, 250mA
n Up to 50mA of Output Current
n Up to 90% Efficiency
n Programmable Coulomb Counter Prescaler for Wide
Range of Battery Sizes
n Programmable Discharge Alarm Threshold
n I2C Interface
n Low Profile (0.75mm) 20-Lead (3mm × 4mm) QFN
Package
Applications
n Long Lifetime Primary Cell Battery Applications
n Wireless Sensors
n Remote Monitors
n Dust Networks® SmartMesh® Applications
Electrical Specifications Subject to Change
LTC3335
Nanopower Buck-Boost
DC/DC with Integrated
Coulomb Counter
Description
The LTC®3335 is a high efficiency, low quiescent current
(680nA) buck-boost DC/DC converter with an integrated
precision coulomb counter which monitors accumulated
battery discharge in long life battery powered applications.
The buck-boost can operate down to 1.8V on its input and
provides eight pin selectable output voltages with up to
50mA of output current.
The coulomb counter stores the accumulated battery dis-
charge in an internal register accessible via an I2C interface.
The LTC3335 features a programmable discharge alarm
threshold. When the threshold is reached, an interrupt is
generated at the IRQ pin.
To accommodate a wide range of battery types and sizes,
the peak input current can be selected from as low as 5mA
to as high as 250mA and the full-scale coulomb counter
has a programmable range of 32,768:1.
The LTC3335is availablein a 3mm × 4mm QFN-20 package.
L, LT, LTC, LTM, Linear Technology, the Linear logo, SmartMesh and Dust Networks are
registered trademarks of Linear Technology Corporation. All other trademarks are the property
of their respective owners.
Typical Application
2.2mH TO 47µH
PRIMARY CELL +
1.8V TO 5.5V
IPEAK = 5mA TO 250mA
10µF
10k
I2C
10k
3
3
SW1 SW2
BAT
PBAT
EN
VOUT
PVOUT
DVCC
LTC3335
SCL
SDA IRQ
IPK[2:0]
PGOOD
OUT[2:0]
GND
3335 TA01
1.8V TO 5V
47µF
Efficiency vs Load for 100mA
IPEAK Setting
100
90
80
70
60
50
40
30
20 BAT = 3.6V
10
L = 150µH
DCR = 0.3Ω
0
0.001 0.01
0.1 1
ILOAD (mA)
VOUT = 1.8V
VOUT = 2.5V
VOUT = 3.3V
VOUT = 5V
10 100
3335 TA01a
3335p
LINEARFoTr mEoCre iHnfoNrmOatiLonOwwGwY.lineCar.cOomN/LTFC3I3D35ENTIAL
1
1 page  
LTC3335
Electrical Characteristics The l denotes the specifications which apply over the full operating junction
temperature range, otherwise specifications are at TA = 25°C (Note 2). BAT = PBAT = 3.6V, GNDA = GNDD = PGND = 0V, VOUT = PVOUT.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Digital Input Low Voltage
Digital Output High Voltage
Digital Output Low Voltage
For Pins EN, IPK[2:0], OUT[2:0]
For Pins SDA, SCL
For Pins PGOOD, IRQ; 1µA Out of Pin
For Pins PGOOD, IRQ; 1µA Into Pin
For Pin SDA; 3mA Into Pin
l
l DVCC – 0.5
l
0.5 V
30 %DVCC
V
0.5 V
0.4 V
Input High Current
For Pins EN, IPK[2:0], OUT[2:0], SDA, SCL
0 10
nA
Input Low Current
For Pins EN, IPK[2:0], OUT[2:0], SDA, SCL
I2C Timing Characteristics (See Figure 1)
I2C address
0 10
1100100
[R/W]
nA
Clock Operating Frequency
Bus Free Time Between
STOP/START
fSCL
tBUF
400 kHz
1.3 µs
Repeated START Set-Up Time
Hold Time (Repeated) START
Condition
tSU,STA
tHD,STA
600 ns
600 ns
Set-Up Time for STOP Condition
Data Set-Up Time Input
Data Hold Time Input
Data Hold Time Output
Clock Data Fall Time
Clock Data Rise Time
Clock LOW Period
Clock HIGH Period
Spike Suppression Time
tSU,STO
tSU,DAT
tHD,DATI
tHD,DATO
tf
tr
tLOW
tHIGH
tSP
600 ns
100 ns
0 µs
0 0.9 µs
20 300 ns
20 300 ns
1.3 µs
0.6 µs
50 ns
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.
Note 2: The LTC3335 is tested under pulsed load conditions such that TJ ≈
TA. The LTC3335E is guaranteed to meet specifications from 0°C to 85°C.
Specifications over the –40°C to 125°C operating junction temperature
range are assured by design, characterization, and correlation with statistical
process controls. The LTC3335I is guaranteed over the –40°C to 125°C
operating 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 3: TJ is calculated from the ambient TA and power dissipation PD
according to the following formula: TJ = TA + (PD • θJA).
Note 4: Dynamic supply current is higher due to gate charge being
delivered at the switching frequency.
Note 5: The PGOOD Falling Threshold is specified as a percentage of the
average of the measured sleep and wake-up thresholds for each selected
output. The PGOOD rising threshold is equal to the sleep threshold. See
Regulated Output Voltage specification.
Note 6: For the 100mA IPEAK setting, the value given in the table is
measured in a closed-loop set-up with a 100µH inductor, a 3.6V BAT
voltage, and the LTC3335 switching. For the other seven IPEAK settings,
the values given in the table are calculated from an open-loop DC
measurement of IPEAK (LTC3335 not switching), the propagation delay of
the IPEAK comparator, and the recommended inductor value for each IPEAK
setting.
Note 7: IZERO measurements are performed when the LTC3335 is not
switching. The values seen in operation will be slightly lower due to the
propagation delay of the comparators
Note 8: The equivalent charge of an LSB in the accumulated charge
register C depends on the IPEAK setting and the internal pre-scaling
factor M. See Choosing Coulomb Counter Prescaler M section for more
information. 1mA • hr = 3.6A • s = 3.6C.
Note 9: The values given in the table are for applications using the
recommended inductor value for each IPEAK setting.
Note10: The specified accuracy of qLSB in percent is better than that of the
corresponding IPEAK because the full-scale ON time of the AC(ON) time
measurement is internally adjusted to compensate for errors in the actual
IPEAK value. The Total Charge Error specified includes any inaccuracy in
qLSB.
LINEARFoTr mEoCre iHnfoNrmOatiLonOwwGwY.lineCar.cOomN/LTFC3I3D35ENTIAL
3335p
5
5 Page 
LTC3335
Typical Performance Characteristics
PGND = 0V, VOUT = PVOUT = 3.3V, 100mA IPEAK setting, unless otherwise noted.
TA = 25°C, BAT = PBAT = 3.6V, GNDA = GNDD =
Total Unadjusted Coulomb
Counter Error During Continuous
Switching (250mA IPEAK Setting)
5
4
VOUT = 1.8V
VOUT = 3.3V
3 VOUT = 5V
2
1
0
–1
–2
–3
–4
–5
–6
1.8 2.3 2.8 3.3 3.8 4.3 4.8 5.3
BAT (V)
Total Unadjusted Coulomb
Counter Error During Continuous
Switching (150mA IPEAK Setting)
5
4
VOUT = 1.8V
VOUT = 3.3V
3 VOUT = 5V
2
1
0
–1
–2
–3
–4
–5
1.8 2.3 2.8 3.3 3.8 4.3 4.8 5.3
BAT (V)
Total Unadjusted Coulomb
Counter Error During Continuous
Switching (100mA IPEAK Setting)
5
4
VOUT = 1.8V
VOUT = 3.3V
3 VOUT = 5V
2
1
0
–1
–2
–3
–4
–5
1.8 2.3 2.8 3.3 3.8 4.3 4.8 5.3
BAT (V)
3335 G37
Total Unadjusted Coulomb
Counter Error During Continuous
Switching (50mA IPEAK Setting)
4
VOUT = 1.8V
VOUT = 3.3V
2 VOUT = 5V
0
3335 G38
Total Unadjusted Coulomb
Counter Error During Continuous
Switching (25mA IPEAK Setting)
5
VOUT = 1.8V
VOUT = 3.3V
VOUT = 5V
0
3335 G39
Total Unadjusted Coulomb
Counter Error During Continuous
Switching (15mA IPEAK Setting)
5
VOUT = 1.8V
0
VOUT = 3.3V
VOUT = 5V
–5
–2 –5 –10
–4
–15
–6 –10
–8 –20
–10
1.8 2.3 2.8 3.3 3.8 4.3 4.8 5.3
BAT (V)
–15
1.8
3335 G40
Total Unadjusted Coulomb
Counter Error During Continuous
Switching (10mA IPEAK Setting)
5
VOUT = 1.8V
0
VOUT = 3.3V
VOUT = 5V
–5
–10
–15
–20
–25
–30
1.8 2.3 2.8 3.3 3.8 4.3 4.8 5.3
BAT (V)
3335 G43
2.8 3.8
BAT (V)
–25
4.8 1.8 2.3 2.8 3.3 3.8 4.3
BAT (V)
3335 G41
Total Unadjusted Coulomb
Counter Error During Continuous
Switching(5mA IPEAK Setting)
5
0
VOUT = 1.8V
VOUT = 3.3V
–5 VOUT = 5V
–10
–15
–20
–25
–30
–35
–40
–45
1.8 2.3 2.8 3.3 3.8 4.3 4.8 5.3
BAT (V)
3335 G44
4.8 5.3
3335 G42
3335p
LINEARFoTr mEoCre iHnfoNrmOatiLonOwwGwY.lineCar.cOomN/LTFC3I3D35ENTIAL
11
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet LTC3335.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| LTC3330 | Energy Harvesting DC/DC | Linear Technology |
| LTC3335 | Nanopower Buck-Boost DC/DC | Linear Technology |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |