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LTC3727AEG-1#TRPBF

Description
DC/DC Cntrlr Single-OUT Step Down 430kHz Automotive 28-Pin SSOP T/R
File Size333KB,32 Pages
ManufacturerADI
Websitehttps://www.analog.com
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LTC3727AEG-1#TRPBF Overview

DC/DC Cntrlr Single-OUT Step Down 430kHz Automotive 28-Pin SSOP T/R

LTC3727AEG-1#TRPBF Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesCompliant
ECCN (US)EAR99
Part StatusActive
Number of Outputs1
TopologyStep Down
Output Voltage (V)0.8 to 14
Maximum Output Current (A)3
Maximum Switching Frequency (kHz)430
Minimum Input Voltage (V)4
Maximum Input Voltage (V)36
Operating Supply Voltage (V)4 to 36
Maximum Supply Current (mA)0.67
Typical Quiescent Current (mA)0.67
Minimum Switching Frequency (kHz)350
Typical Switching Frequency (kHz)380
Synchronous RectifierYes
Synchronous ClockYes
Control MethodPWM
ProgrammabilityYes
Minimum Operating Temperature (°C)-40
Maximum Operating Temperature (°C)85
Supplier Temperature GradeExtended
PackagingTape and Reel
Pin Count28
Standard Package NameSOP
Supplier PackageSSOP
MountingSurface Mount
Package Height2(Max) - 0.05(Min)
Package Length10.5(Max)
Package Width5.6(Max)
PCB changed28
Lead ShapeGull-wing
FEATURES
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
LTC3727A-1
High Efficiency, 2-Phase
Synchronous Step-Down
Switching Regulators
DESCRIPTION
The LTC
®
3727A-1 is a high performance dual step-down
switching regulator controller that drives all N-channel
synchronous power MOSFET stages. A constant 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.
The LTC3727A-1 is an improved version of the LTC3727
family of parts. It has smaller output ripple while in the
drop-out condition and shorter minimum on-time.
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. Current
foldback limits MOSFET heat dissipation during short-circuit
conditions. Output overvoltage protection circuitry protects
the controller until V
OUT
returns to normal.
, LTC and LT 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.
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
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
APPLICATIONS
n
n
n
Telecom Systems
Automotive Systems
Battery-Operated Digital Devices
TYPICAL APPLICATION
+
4.7μF
M1
8μH
0.1μF
M2
V
IN
PGOOD INTV
CC
TG1
TG2
BOOST1
SW1
BG1
PLLIN
SENSE1
+
0.015Ω
V
OUT1
5V
5A
1000pF
SENSE1
V
OSENSE1
105k
1%
I
TH1
20k
1%
220pF
15k
SENSE2
V
OSENSE2
I
TH2
220pF
15k
20k
1%
280k
1%
LTC3727A-1
BOOST2
SW2
BG2
PGND
SENSE2
+
1000pF
M4
1μF
CERAMIC
M3
0.1μF
22μF
50V
CERAMIC
V
IN
18V TO 28V
15μH
0.015Ω
V
OUT2
12V
4A
+
47μF
6V
SP
M1, M2, M3, M4: FDS6680A
RUN/SS1 SGND RUN/SS2
0.1μF
0.1μF
+
56μF
15V
SP
3727 F01
Figure 1. High Efficiency Dual 12V/5V Step-Down Converter
3727a1fa
1

LTC3727AEG-1#TRPBF Related Products

LTC3727AEG-1#TRPBF LTC3727AEG-1#PBF LTC3727AIG-1#PBF LTC3727AIG-1#TRPBF
Description DC/DC Cntrlr Single-OUT Step Down 430kHz Automotive 28-Pin SSOP T/R DC/DC Cntrlr Single-OUT Step Down 430kHz Automotive 28-Pin SSOP Tube DC/DC Cntrlr Single-OUT Step Down 430kHz Automotive 28-Pin SSOP Tube DC/DC Cntrlr Single-OUT Step Down 430kHz Automotive 28-Pin SSOP 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
Number of Outputs 1 1 1 1
Topology Step Down Step Down Step Down Step Down
Output Voltage (V) 0.8 to 14 0.8 to 14 0.8 to 14 0.8 to 14
Maximum Output Current (A) 3 3 3 3
Maximum Switching Frequency (kHz) 430 430 430 430
Minimum Input Voltage (V) 4 4 4 4
Maximum Input Voltage (V) 36 36 36 36
Operating Supply Voltage (V) 4 to 36 4 to 36 4 to 36 4 to 36
Maximum Supply Current (mA) 0.67 0.67 0.67 0.67
Typical Quiescent Current (mA) 0.67 0.67 0.67 0.67
Minimum Switching Frequency (kHz) 350 350 350 350
Typical Switching Frequency (kHz) 380 380 380 380
Synchronous Rectifier Yes Yes Yes Yes
Synchronous Clock Yes Yes Yes Yes
Control Method PWM PWM PWM PWM
Programmability Yes Yes Yes Yes
Minimum Operating Temperature (°C) -40 -40 -40 -40
Maximum Operating Temperature (°C) 85 85 85 85
Supplier Temperature Grade Extended Extended Extended Industrial
Pin Count 28 28 28 28
Standard Package Name SOP SOP SOP SOP
Supplier Package SSOP SSOP SSOP SSOP
Mounting Surface Mount Surface Mount Surface Mount Surface Mount
Package Height 2(Max) - 0.05(Min) 2(Max) - 0.05(Min) 2(Max) - 0.05(Min) 2(Max) - 0.05(Min)
Package Length 10.5(Max) 10.5(Max) 10.5(Max) 10.5(Max)
Package Width 5.6(Max) 5.6(Max) 5.6(Max) 5.6(Max)
PCB changed 28 28 28 28
Lead Shape Gull-wing Gull-wing Gull-wing Gull-wing
Packaging Tape and Reel Tube Tube -
HTS - 8542.39.00.01 8542.39.00.01 8542.39.00.01
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