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Linear Technology Electronic Components Datasheet

LTC3335 Datasheet

Nanopower Buck-Boost DC/DC

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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
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 LTC3335 is available in 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
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
For more information www.linear.com/LTC3335
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
3335f
1


Linear Technology Electronic Components Datasheet

LTC3335 Datasheet

Nanopower Buck-Boost DC/DC

No Preview Available !

LTC3335
Absolute Maximum Ratings
(Note 1)
BAT, PBAT, VOUT, PVOUT Voltage................... –0.3V to 6V
EN, OUT[2:0],
IPK[2:0] Voltage ......–0.3V to [Lesser of (BAT + 0.3V) or 6V]
DVCC, SDA, SCL Voltage............................... –0.3V to 6V
PGOOD,
IRQ Voltage......–0.3V to [Lesser of (DVCC + 0.3V) or 6V]
SW1, SW2 Current............................................... 350mA
Operating Junction Temperature Range
(Notes 2, 3)............................................. –40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
Pin Configuration
TOP VIEW
SDA
DVCC
OUT2
OUT1
OUT0
GNDD
1
2
3
4
5
6
20 19 18 17
21
PGND
7 8 9 10
16 EN
15 IPK2
14 IPK1
13 IPK0
12 VOUT
11 PVOUT
UDC PACKAGE
20-LEAD (3mm × 4mm) PLASTIC QFN
TJMAX = 125°C, θJA = 52°C/W
EXPOSED PAD (PIN 21) IS PGND, MUST BE SOLDERED TO PCB
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3335EUDC#PBF
LTC3335EUDC#TRPBF LGTR
20-Lead (3mm × 4mm) Plastic QFN
LTC3335IUDC#PBF
LTC3335IUDC#TRPBF LGTR
20-Lead (3mm × 4mm) Plastic QFN
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on nonstandard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
3335f
2 For more information www.linear.com/LTC3335


Part Number LTC3335
Description Nanopower Buck-Boost DC/DC
Maker Linear Technology
Total Page 28 Pages
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