Regulator. LTC3626 Datasheet

LTC3626 Regulator. Datasheet pdf. Equivalent


Part Number

LTC3626

Description

2.5A Synchronous Monolithic Step-Down Regulator

Manufacture

Linear Technology

Total Page 28 Pages
Datasheet
Download LTC3626 Datasheet


LTC3626
LTC3626
20V, 2.5A Synchronous
Monolithic Step-Down Regulator with
Current and Temperature Monitoring
FEATURES
DESCRIPTION
n 3.6V to 20V Input Voltage Range
n Wide Output Voltage Range of 0.6V to 97% VIN
Optimized for 0.6V to 6V
n Low RDS(ON) Integrated Switches Provide Up to 95%
Efficiency
n Up to 2.5A of Output Current
n Average Input and Output Current Monitoring
n Programmable Average Input/Output Current Limit
n Die Temperature Monitor and Programmable Limit
n Adjustable Switching Frequency: 500kHz to 3MHz
n External Frequency Synchronization
n Current Mode Operation for Excellent Line and Load
Transient Response
n 0.6V Reference with 1% Accuracy Over Temperature
n User Selectable Burst Mode® or Forced Continuous
Operation
n Short-Circuit Protected
n Output Voltage Tracking Capability
n Power Good Status Output
n Available in Small, Thermally Enhanced, 20-Lead
(3mm × 4mm) QFN Package
APPLICATIONS
n Distributed Power Systems
n Battery-Powered Instruments
n Point-of-Load Power Supply
The LTC®3626 is a high efficiency, monolithic synchronous
buck regulator using a phase-lockable controlled on-time,
current mode architecture capable of supplying up to 2.5A
of output current. The operating supply voltage range is
3.6V to 20V, making it suitable for a wide range of power
supply applications.
The operating frequency is programmable from 500kHz to
3MHz with an external resistor allowing the use of small
surface mount inductors. For applications sensitive to
switching noise, the LTC3626 can be externally synchro-
nized over the same frequency range. An internal phase-
locked loop aligns the on-time of the top power MOSFET to
the internal or external clock. This unique controlled on-time
architecture is ideal for high step-down ratio applications
that demand high switching frequencies and fast transient
response. An internal phase lock loop servos the on-time
of the internal one-shot timer to match the frequency of
the internal clock or an applied external clock.
The LTC3626 offers two operational modes: Burst
Mode and forced continuous mode to allow the user
to optimize output voltage ripple, noise and light load
efficiency for a given application.
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered and Hot
Swap is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners. Protected by U.S. Patents, including 5481178, 5847554, 6580258,
6304066, 6476589, 6774611, 5994885.
TYPICAL APPLICATION
VIN
3.6V TO 20V
47µF
PVIN
SVIN
RUN BOOST
LTC3626
PGOOD
2.2µF
INTVCC
TRACK/SS
ITH
SW
MODE/SYNC
TSET
VON
IMONIN
TMON
FB
RT
IMONOUT
1µF 5.1k SGND PGND
0.1µF
2.2µH
324k
115k
22pF
25.5k
3626 TA01
VOUT
3.3V
47µF 2.5A
Efficiency vs Load Current
100
90
VOUT = 3.3V
80 10
70
60 1
50
40 0.1
30
20
10
0
1
Burst Mode
OPERATION
0.01
VIN = 12V
VIN = 5V 0.001
10 100 1000 10000
LOAD CURRENT (mA)
3626 TA01b
3626f
1
http://www.Datasheet4U.com

LTC3626
LTC3626
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PVIN ........................................................... –0.3V to 22V
SVIN ........................................................... –0.3V to 22V
BOOST .................................................... –0.3V to 25.6V
BOOST-SW................................................ –0.3V to 3.6V
INTVCC ...................................................... –0.3V to 3.6V
ITH, RT, FB.................................–0.3V to INTVCC + 0.3V
MODE/SYNC ..............................–0.3V to INTVCC + 0.3V
TRACK/SS, IMONIN, IMONOUT ...–0.3V to INTVCC + 0.3V
TSET, TMON ..............................–0.3V to INTVCC + 0.3V
SW, RUN.......................................... –0.3V to VIN + 0.3V
PGOOD....................................................... –0.3V to 22V
VON ............................................................ –0.3V to 18V
SW Source Current (DC, Note 2)..............................2.5A
Operating Junction Temperature Range
(Notes 3, 4) ........................................... –40°C to 125°C
Storage Temperature Range .................. –65°C to 150°C
PIN CONFIGURATION
TOP VIEW
BOOST 1
INTVCC 2
VON 3
TSET 4
TMON 5
SGND 6
20 19 18 17
21
PGND
16 PVIN
15 PVIN
14 SVIN
13 RUN
12 RT
11 ITH
7 8 9 10
UDC PACKAGE
20-LEAD (3mm × 4mm) PLASTIC QFN
TJMAX = 125°C, θJA = 47°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
TEMPERATURE RANGE
LTC3626EUDC#PBF
LTC3626EUDC#TRPBF LGCC
20-Lead (3mm × 4mm) Plastic QFN
–40°C to 125°C
LTC3626IUDC#PBF
LTC3626IUDC#TRPBF LGCC
20-Lead (3mm × 4mm) Plastic QFN
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping
container.Consult LTC Marketing for information on non-standard 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/
3626f
2


Features EFF ICIENCY (%) LTC3626 20V, 2.5A Synchro nous Monolithic Step-Down Regulator wit h Current and Temperature Monitoring F EATURES DESCRIPTION n 3.6V to 20V Inp ut Voltage Range n Wide Output Voltage Range of 0.6V to 97% VIN Optimized for 0.6V to 6V n Low RDS(ON) Integrated Swi tches Provide Up to 95% Efficiency n Up to 2.5A of Output Current n Average In put and Output Current Monitoring n Pro grammable Average Input/Output Current Limit n Die Temperature Monitor and Pro grammable Limit n Adjustable Switching Frequency: 500kHz to 3MHz n External Fr equency Synchronization n Current Mode Operation for Excellent Line and Load T ransient Response n 0.6V Reference with 1% Accuracy Over Temperature n User Se lectable Burst Mode® or Forced Continu ous Operation n Short-Circuit Protected n Output Voltage Tracking Capability n Power Good Status Output n Available i n Small, Thermally Enhanced, 20-Lead (3 mm × 4mm) QFN Package APPLICATIONS n Distributed Power Systems n.
Keywords LTC3626, datasheet, pdf, Linear Technology, 2.5A, Synchronous, Monolithic, Step-Down, Regulator, TC3626, C3626, 3626, LTC362, LTC36, LTC3, Equivalent, stock, pinout, distributor, price, schematic, inventory, databook, Electronic, Components, Parameters, parts, cross reference, chip, Semiconductor, circuit, Electric, manual, substitute




@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)