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LTC3727EG#PBF

Description
IC REG CTRLR BUCK 28SSOP
CategoryPower/power management    The power supply circuit   
File Size347KB,32 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Environmental Compliance
Download Datasheet Parametric View All

LTC3727EG#PBF Overview

IC REG CTRLR BUCK 28SSOP

LTC3727EG#PBF Parametric

Parameter NameAttribute value
Brand NameLinear Technology
Is it Rohs certified?conform to
MakerLinear ( ADI )
Parts packaging codeSSOP
package instructionSSOP, SSOP28,.3
Contacts28
Manufacturer packaging codeG
Reach Compliance Codecompliant
ECCN codeEAR99
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-G28
JESD-609 codee3
length10.2 mm
Humidity sensitivity level1
Number of functions1
Number of terminals28
Maximum operating temperature85 °C
Minimum operating temperature
Maximum output current3 A
Package body materialPLASTIC/EPOXY
encapsulated codeSSOP
Encapsulate equivalent codeSSOP28,.3
Package shapeRECTANGULAR
Package formSMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius)260
Certification statusNot Qualified
Maximum seat height2 mm
surface mountYES
Switch configurationPHASE-SHIFT
Maximum switching frequency580 kHz
technologyCMOS
Temperature levelCOMMERCIAL EXTENDED
Terminal surfaceMatte Tin (Sn)
Terminal formGULL WING
Terminal pitch0.65 mm
Terminal locationDUAL
Maximum time at peak reflow temperature30
width5.3 mm
LTC3727/LTC3727-1
High Efficiency, 2-Phase
Synchronous Step-Down Switching Regulators
FEATURES
DESCRIPTIO
Wide Output Voltage Range: 0.8V
V
OUT
14V
Out-of-Phase Controllers Reduce Required Input
Capacitance and Power Supply Induced Noise
OPTI-LOOP
®
Compensation Minimizes C
OUT
±1%
Output Voltage Accuracy
Power Good Output Voltage Monitor
Phase-Lockable Fixed Frequency 250kHz to 550kHz
Latched Short-Circuit Shutdown (LTC3727 Only)
Dual N-Channel MOSFET Synchronous Drive
Wide V
IN
Range: 4V to 36V Operation
Very Low Dropout Operation: 99% Duty Cycle
Adjustable Soft-Start Current Ramping
Foldback Output Current Limiting
Output Overvoltage Protection
Low Shutdown I
Q
: 20μA
Selectable Constant Frequency or Burst Mode
®
Operation
Small 28-Lead SSOP Package
LTC3727-1 Also Available in the 5mm
×
5mm QFN
Package
The LTC
®
3727/LTC3727-1 are high performance dual
step-down switching regulator controllers that drive all
N-channel synchronous power MOSFET stages. A con-
stant frequency current mode architecture allows phase-
lockable frequency of up to 550kHz. Power loss and noise
due to the ESR of the input capacitors are minimized by
operating the two controller output stages out of phase.
OPTI-LOOP compensation allows the transient response
to be optimized over a wide range of output capacitance and
ESR values. There is a precision 0.8V reference and a power
good output indicator. A wide 4V to 30V (36V maximum)
input supply range encompasses all battery chemistries.
A RUN/SS pin for each controller provides soft-start, and
on the LTC3727GN, optional timed, short-circuit shut-
down. Current foldback limits MOSFET heat dissipation
during short-circuit conditions when overcurrent latchoff
is disabled. Output overvoltage protection circuitry latches
on the bottom MOSFET until V
OUT
returns to normal. The
FCB mode pin can select among Burst Mode, constant
frequency mode and continuous inductor current mode or
regulate a secondary winding.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Burst
Mode and OPTI-LOOP are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Protected by U.S. Patents, including
5481178, 5929620, 6177787, 6144194, 6100678, 5408150, 6580258, 6304066, 5705919.
APPLICATIO S
Telecom Systems
Automotive Systems
Battery-Operated Digital Devices
TYPICAL APPLICATIO
+
4.7μF
M1
8μH
0.1μF
M2
TG1
V
IN
PGOOD INTV
CC
TG2
BOOST2
SW2
LTC3727/
LTC3727-1
BG2
PGND
+
1μF
CERAMIC
M3
0.1μF
BOOST1
SW1
BG1
PLLIN
SENSE1
SENSE2
+
1000pF
0.015Ω
V
OUT2
12V
4A
0.015Ω
V
OUT1
5V
5A
1000pF
SENSE1
105k
1%
SENSE2
V
OSENSE1
I
TH1
20k
1%
220pF
15k
V
OSENSE2
I
TH2
220pF
15k
20k
1%
280k
1%
+
47μF
6V
SP
M1, M2, M3, M4: FDS6680A
RUN/SS1 SGND RUN/SS2
0.1μF
0.1μF
Figure 1. High Efficiency Dual 12V/5V Step-Down Converter
3727fc
U
U
U
22μF
50V
CERAMIC
V
IN
18V TO 28V
15μH
M4
+
56μF
15V
SP
3727 F01
1
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