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LTC3728LEGN-1

Description
Switching Regulator LTC3728L-1 - Dual, 550kHz, 2-Phase Synchronous Regulator
Categorysemiconductor    Power management IC    Voltage regulator and the voltage controller    Switching voltage stabilizer   
File Size471KB,32 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Download user manual Parametric Compare View All

LTC3728LEGN-1 Overview

Switching Regulator LTC3728L-1 - Dual, 550kHz, 2-Phase Synchronous Regulator

LTC3728LEGN-1 Parametric

Parameter NameAttribute value
MakerADI
Product Categoryswitching regulator
RoHSN
Installation styleSMD/SMT
Package/boxSSOP-28
Output current25 A
Number of outputs2 Output
Maximum input voltage28 V
Minimum input voltage4.5 V
seriesLTC3728L-1
Working power current0.45 mA
FEATURES
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LTC3728L-1
Dual, 550kHz, 2-Phase
Synchronous Regulator
DESCRIPTION
The LTC
®
3728L-1 is a dual high performance 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 LTC3728L-1
is identical to the LTC3728L except that the LTC3728L-1
lacks the over current latchoff feature.
OPTI-LOOP compensation allows the transient response to
be optimized over a wide range of output capacitance and
ESR values. The precision 0.8V reference and power good
output indicator are compatible with future microproces-
sor generations, and a wide 4.5V to 28V (30V maximum/
35V for LTC3728LI-1) input supply range encompasses
all battery chemistries.
A RUN/SS pin for each controller provides soft-start.
Current foldback limits MOSFET dissipation during short-
circuit conditions. The FCB mode pin can select among
Burst Mode operation, constant frequency mode and
continuous inductor current mode or regulate a secondary
winding. The LTC3728L-1 includes a power good output
pin that indicates when both outputs are within 7.5% of
their designed set point.
L,
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 5929620, 6177787, 6144199, 5471178, 5994885, 6100678.
Dual, 180° Phased Controllers Reduce Required
Input Capacitance and Power Supply Induced Noise
OPTI-LOOP
®
Compensation Minimizes C
OUT
±1.5% Output Voltage Accuracy
Power Good Output Voltage Indicator
Phase-Lockable Fixed Frequency 250kHz to 550kHz
Over Current Latchoff Disabled
Wide V
IN
Range: 4.5V to 28V (35V for LTC3728LI-1)
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
5V and 3.3V Standby Regulators
3 Selectable Operating Modes: Constant Frequency,
Burst Mode
®
Operation and PWM
5mm
×
5mm QFN and 28-Lead Narrow SSOP
Packages
APPLICATIONS
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Notebook and Palmtop Computers
Telecom Systems
Portable Instruments
Battery-Operated Digital Devices
DC Power Distribution Systems
TYPICAL APPLICATION
+
4.7μF
M1
L1
3.2μH
D3
V
IN
PGOOD INTV
CC
TG1
TG2
C
B1
, 0.1μF
BOOST1
SW1
BG1
f
IN
500kHz
PLLIN
SENSE1
+
R
SENSE1
0.01Ω
V
OUT1
5V
5A
1000pF
SENSE1
V
OSENSE1
I
TH1
C
SS1
0.1μF
SENSE2
V
OSENSE2
I
TH2
C
SS2
0.1μF
LTC3728L-1
BOOST2
SW2
BG2
PGND
SENSE2
+
1000pF
D4
1μF
CERAMIC
M2
V
IN
5.2V TO 28V
C
IN
22μF
50V
CERAMIC
L2
3.2μH
C
B2
, 0.1μF
R
SENSE2
0.01Ω
V
OUT2
3.3V
5A
+
R2
105k
C
OUT1
1%
47μF
6V
SP
M1, M2: FDS6982S
R1
20k
1%
C
C1
220pF
R
C1
15k
RUN/SS1 SGND RUN/SS2
C
C2
220pF
R
C2
15k
R3
20k
1%
R4
63.4k
1%
C
OUT
56μF
6V
SP
+
3728l1 F01
Figure 1. High Efficiency Dual 5V/3.3V Step-Down Converter
3728l1fc
1

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Description Switching Regulator LTC3728L-1 - Dual, 550kHz, 2-Phase Synchronous Regulator Switching Voltage Regulators 550kHz, dual, 2 Phase Contoller Fixed Resistor, Wire Wound, 2W, 123ohm, 0.1% +/-Tol, -20,20ppm/Cel, Switching Voltage Regulators 550kHz, dual, 2 Phase Contoller Switching Voltage Regulators 550kHz, dual, 2 Phase Controller Switching Regulator LTC3728L-1 - Dual, 550kHz, 2-Phase Synchronous Regulator Switching Regulator 550kHz, dual, 2 Phase Controller
Product Category switching regulator Switching Voltage Regulators - Switching Voltage Regulators - switching regulator -
RoHS N Details - Details - N -
Maximum input voltage 28 V - - - 28 V 28 V 28 V
Minimum input voltage 4.5 V - - - 4.5 V 4.5 V 4.5 V
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