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LTC3355IUF#PBF

Description
Conv DC-DC 3V to 20V Synchronous Step Down Single-Out 2.7V to 5V 1A 20-Pin QFN EP Tube
File Size362KB,20 Pages
ManufacturerADI
Websitehttps://www.analog.com
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LTC3355IUF#PBF Overview

Conv DC-DC 3V to 20V Synchronous Step Down Single-Out 2.7V to 5V 1A 20-Pin QFN EP Tube

LTC3355IUF#PBF Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesCompliant
ECCN (US)EAR99
Part StatusActive
HTS8542.39.00.01
TypeSynchronous Step Down
Output TypeAdjustable
Switching Frequency (kHz)1250
Switching RegulatorYes
Number of Outputs1
Output Voltage (V)2.7 to 5
Maximum Output Current (A)1
Minimum Input Voltage (V)3
Maximum Input Voltage (V)20
Typical Quiescent Current (uA)120
Minimum Operating Temperature (°C)-40
Maximum Operating Temperature (°C)125
Supplier Temperature GradeIndustrial
PackagingTube
Pin Count20
Standard Package NameQFN
Supplier PackageQFN EP
MountingSurface Mount
Package Height0.75(Max)
Package Length4
Package Width4
PCB changed20
Lead ShapeNo Lead
LTC3355
20V 1A Buck DC/DC with
Integrated SCAP Charger
and Backup Regulator
FEATURES
n
n
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DESCRIPTION
The
LTC
®
3355
is a complete input power interrupt ride-
through DC/DC system. The part charges a supercapacitor
while delivering load current to V
OUT
, and uses energy from
the supercapacitor to provide continuous V
OUT
backup
power when V
IN
power is lost. The LTC3355 contains a
nonsynchronous constant frequency current mode mono-
lithic 1A buck switching regulator to provide a 2.7V to 5V
regulated output voltage from an input supply of up to 20V.
A 1A programmable CC/CV linear charger charges the
supercapacitor from V
OUT
. When the V
IN
supply drops
below the PFI threshold, the devices’s constant frequency
nonsynchronous current mode 5A boost switching
regulator delivers power from the supercapacitor to V
OUT
.
A thermal regulation loop maximizes charge current while
limiting the die temperature to 110°C. The IC has boost,
charger and V
IN
programmable current limits. The LTC3355
is available in a 20-lead 4mm
×
4mm QFN surface mount
package.
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
n
n
n
n
n
n
n
n
V
IN
Voltage Range: 3V to 20V
V
OUT
Voltage Range: 2.7V to 5V
1A Current Mode Buck Main Regulator
5A Boost Backup Regulator Powered from Single
Supercapacitor
Boost Regulator Operates Down to 0.5V for
Maximum Utilization of Supercapacitor Energy
Programmable Supercapacitor Charge Current to
1A with Overvoltage Protection
Charger Supports Single Cell CC/CV Battery Charging
Programmable V
IN
Current Limit
Programmable Boost Current Limit
V
IN
Power Fail Indicator
V
CAP
Power Good Indicator
V
OUT
Power On Reset Output
Compact 20-Lead 4mm
×
4mm QFN Package
APPLICATIONS
n
n
Ride-Through “Dying Gasp” Supplies
Power Meters/Industrial Alarms/Solid State Drives
TYPICAL APPLICATION
Supercapacitor Charger and Ride-Through Power Supply
V
IN
12V
0.091
10µF
10µF
1µF
5
V
IN
SW1
6.8µH
7
V
OUT
4V
47µF 1A (MAX)
VOLTAGE (V)
Backup Operation
14
12
10
8
6
4
2
0
332k
0
5
V
CAP
V
OUT
V
IN
CAPACITOR = 3F
I
VOUT
= 0.125A
6
V
INM5
V
INS
4
1
PFI
PFO
BUCK V
OUT
1A
15
4.7pF
402k
100k
2.49M
200k
10
PFOB
13
RSTB
9
CPGOOD
8
EN_CHG
3
MODE
INTV
CC
18
1µF
I
CHG
12
60.4k
BOOST
FB
2
V
CAP
SW2
LTC3355
14
16
17
3.3µH
665k
2.4V
SCAP
1F TO 50F
CFB
11
I
BSTPK
20
200k
V
CBST
19
154k
220pF
3355 TA01a
10
TIME (SECONDS)
15
20
3355 TA01b
3355fb
For more information
www.linear.com/LTC3355
1

LTC3355IUF#PBF Related Products

LTC3355IUF#PBF LTC3355EUF#PBF LTC3355EUF#TRPBF LTC3355IUF#TRPBF
Description Conv DC-DC 3V to 20V Synchronous Step Down Single-Out 2.7V to 5V 1A 20-Pin QFN EP Tube Conv DC-DC 3V to 20V Synchronous Step Down Single-Out 2.7V to 5V 1A 20-Pin QFN EP Tube Conv DC-DC 3V to 20V Synchronous Step Down Single-Out 2.7V to 5V 1A 20-Pin QFN EP T/R Conv DC-DC 3V to 20V Synchronous Step Down Single-Out 2.7V to 5V 1A 20-Pin QFN EP T/R
EU restricts the use of certain hazardous substances Compliant Compliant Compliant Compliant
ECCN (US) EAR99 EAR99 EAR99 EAR99
Part Status Active Active Active Active
Type Synchronous Step Down Synchronous Step Down Synchronous Step Down Synchronous Step Down
Output Type Adjustable Adjustable Adjustable Adjustable
Switching Frequency (kHz) 1250 1250 1250 1250
Switching Regulator Yes Yes Yes Yes
Number of Outputs 1 1 1 1
Output Voltage (V) 2.7 to 5 2.7 to 5 2.7 to 5 2.7 to 5
Maximum Output Current (A) 1 1 1 1
Minimum Input Voltage (V) 3 3 3 3
Maximum Input Voltage (V) 20 20 20 20
Typical Quiescent Current (uA) 120 120 120 120
Minimum Operating Temperature (°C) -40 -40 -40 -40
Maximum Operating Temperature (°C) 125 125 125 125
Supplier Temperature Grade Industrial Extended Extended Industrial
Packaging Tube Tube Tape and Reel Tape and Reel
Pin Count 20 20 20 20
Standard Package Name QFN QFN QFN QFN
Supplier Package QFN EP QFN EP QFN EP QFN EP
Mounting Surface Mount Surface Mount Surface Mount Surface Mount
Package Height 0.75(Max) 0.75(Max) 0.75(Max) 0.75(Max)
Package Length 4 4 4 4
Package Width 4 4 4 4
PCB changed 20 20 20 20
Lead Shape No Lead No Lead No Lead No Lead
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