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LTC1775CGN#TRPBF

Description
Switching Regulator NoRsense Current Mode DC/DC
CategoryPower/power management    The power supply circuit   
File Size293KB,24 Pages
ManufacturerADI
Websitehttps://www.analog.com
Environmental Compliance
Download Datasheet Parametric Compare View All

LTC1775CGN#TRPBF Overview

Switching Regulator NoRsense Current Mode DC/DC

LTC1775CGN#TRPBF Parametric

Parameter NameAttribute value
Brand NameAnalog Devices Inc
Is it lead-free?Contains lead
Is it Rohs certified?conform to
MakerADI
package instructionSSOP,
Contacts16
Manufacturer packaging code05-08-1641 (GN16)
Reach Compliance Codecompliant
Analog Integrated Circuits - Other TypesSWITCHING CONTROLLER
control modeCURRENT-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage36 V
Minimum input voltage4 V
Nominal input voltage15 V
JESD-30 codeR-PDSO-G16
JESD-609 codee3
length4.9 mm
Humidity sensitivity level1
Number of functions1
Number of terminals16
Maximum operating temperature70 °C
Minimum operating temperature
Maximum output current2 A
Package body materialPLASTIC/EPOXY
encapsulated codeSSOP
Package shapeRECTANGULAR
Package formSMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius)250
Certification statusNot Qualified
Maximum seat height1.75 mm
surface mountYES
Switch configurationPUSH-PULL
Maximum switching frequency165 kHz
technologyCMOS
Temperature levelCOMMERCIAL
Terminal surfaceMatte Tin (Sn)
Terminal formGULL WING
Terminal pitch0.635 mm
Terminal locationDUAL
Maximum time at peak reflow temperatureNOT SPECIFIED
width3.9116 mm
LTC1775
High Power
No R
SENSE
TM
Current Mode
Synchronous Step-Down
Switching Regulator
FEATURES
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
DESCRIPTIO
Highest Efficiency Current Mode Controller
No Sense Resistor Required
300mV Maximum Current Sense Voltage
Stable High Current Operation
Dual N-Channel MOSFET Synchronous Drive
Wide V
IN
Range: 4V to 36V
Wide V
OUT
Range: 1.19V to V
IN
±1%
1.19V Reference
Programmable Fixed Frequency with Injection Lock
Very Low Drop Out Operation: 99% Duty Cycle
Forced Continuous Mode Control Pin
Optional Programmable Soft Start
Pin Selectable Output Voltage
Foldback Current Limit
Output Overvoltage Protection
Logic Controlled Micropower Shutdown: I
Q
< 30µA
Available in 16-Lead Narrow SSOP and SO Packages
The LTC
®
1775 is a synchronous step-down switching
regulator controller that drives external N-channel power
MOSFETs using few external components. Current mode
control with MOSFET V
DS
sensing eliminates the need for
a sense resistor and improves efficiency. Largely similar
to the LTC1625, the LTC1775 has twice the maximum
sense voltage for high current applications. The frequency
of a nominal 150kHz internal oscillator can be synchro-
nized to an external clock over a 1.5:1 frequency range.
Burst Mode
TM
operation at low load currents reduces
switching losses and low dropout operation extends oper-
ating time in battery-powered systems. A forced continu-
ous mode control pin can assist secondary winding
regulation by disabling Burst Mode operation when the
main output is lightly loaded.
Fault protection is provided by foldback current limiting
and an output overvoltage comparator. An external ca-
pacitor attached to the RUN/SS pin provides soft start
capability for supply sequencing. A wide supply range
allows operation from 4V (4.3V for LTC1775I) to 36V at the
input and 1.19V to V
IN
at the output.
, LTC and LT are registered trademarks of Linear Technology Corporation.
No R
SENSE
and Burst Mode are trademarks of Linear Technology Corporation.
APPLICATIO S
s
s
s
s
Notebook Computers
Automotive Electronics
Battery Chargers
Distributed Power Systems
TYPICAL APPLICATION
LTC1775
SYNC
C
SS
0.1µF
RUN/SS
V
PROG
R
C
10k
C
C
2.2nF
I
TH
SGND
V
IN
TK
TG
SW
BOOST
INTV
CC
BG
C
B
0.33µF
D
B
CMDSH-3
D1
MBRS340
M2
SUD50N03-10
M1
SUD50N03-10
L1
6µH
+
EFFICIENCY (%)
C
IN
22µF
30V
×
4
V
IN
5V TO
28V
+
V
OUT
3.3V
C
OUT
10A
680µF
6.3V
+
V
OSENSE
PGND
C
VCC
4.7µF
1775 F01
Figure 1. High Efficiency Step-Down Converter
U
Efficiency vs Load Current
100
95
90
85
80
75
70
0.01
V
IN
= 10V
f = 150kHz
FCB = INTV
CC
V
OUT
= 5V
V
OUT
= 3.3V
0.1
1
LOAD CURRENT (A)
10
1775 F01b
U
U
1

LTC1775CGN#TRPBF Related Products

LTC1775CGN#TRPBF LTC1775IS#TR LTC1775IGN#TR LTC1775CGN#TR
Description Switching Regulator NoRsense Current Mode DC/DC Switching Voltage Regulators LTC1775 - High Power No RSENSE Current Mode Synchronous Step-Down Switching Regulator Switching Regulator LTC1775 - High Power No RSENSE Current Mode Synchronous Step-Down Switching Regulator Switching Regulator LTC1775 - High Power No RSENSE Current Mode Synchronous Step-Down Switching Regulator
Is it Rohs certified? conform to incompatible incompatible incompatible
Maker ADI ADI ADI ADI
package instruction SSOP, SOP, SSOP, SSOP,
Reach Compliance Code compliant not_compliant not_compliant not_compliant
Analog Integrated Circuits - Other Types SWITCHING CONTROLLER SWITCHING CONTROLLER SWITCHING CONTROLLER SWITCHING CONTROLLER
control mode CURRENT-MODE CURRENT-MODE CURRENT-MODE CURRENT-MODE
Control Technology PULSE WIDTH MODULATION PULSE WIDTH MODULATION PULSE WIDTH MODULATION PULSE WIDTH MODULATION
Maximum input voltage 36 V 36 V 36 V 36 V
Minimum input voltage 4 V 4 V 4 V 4 V
Nominal input voltage 15 V 15 V 15 V 15 V
JESD-30 code R-PDSO-G16 R-PDSO-G16 R-PDSO-G16 R-PDSO-G16
JESD-609 code e3 e0 e0 e0
length 4.9 mm 9.9 mm 4.9 mm 4.9 mm
Humidity sensitivity level 1 1 1 1
Number of functions 1 1 1 1
Number of terminals 16 16 16 16
Maximum operating temperature 70 °C 85 °C 85 °C 70 °C
Maximum output current 2 A 2 A 2 A 2 A
Package body material PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY
encapsulated code SSOP SOP SSOP SSOP
Package shape RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR
Package form SMALL OUTLINE, SHRINK PITCH SMALL OUTLINE SMALL OUTLINE, SHRINK PITCH SMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius) 250 255 235 235
Certification status Not Qualified Not Qualified Not Qualified Not Qualified
Maximum seat height 1.75 mm 1.75 mm 1.75 mm 1.75 mm
surface mount YES YES YES YES
Switch configuration PUSH-PULL PUSH-PULL PUSH-PULL PUSH-PULL
Maximum switching frequency 165 kHz 165 kHz 165 kHz 165 kHz
technology CMOS CMOS CMOS CMOS
Temperature level COMMERCIAL INDUSTRIAL INDUSTRIAL COMMERCIAL
Terminal surface Matte Tin (Sn) Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb)
Terminal form GULL WING GULL WING GULL WING GULL WING
Terminal pitch 0.635 mm 1.27 mm 0.635 mm 0.635 mm
Terminal location DUAL DUAL DUAL DUAL
Maximum time at peak reflow temperature NOT SPECIFIED 40 20 20
width 3.9116 mm 3.9 mm 3.9116 mm 3.9116 mm
ECCN code - EAR99 EAR99 EAR99
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