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LTC3728LCUH#TR

Description
Switching Regulators LTC3728L and LX - Dual, 550kHz, 2-Phase Synchronous Regulators
CategoryPower/power management    The power supply circuit   
File Size444KB,38 Pages
ManufacturerADI
Websitehttps://www.analog.com
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LTC3728LCUH#TR Overview

Switching Regulators LTC3728L and LX - Dual, 550kHz, 2-Phase Synchronous Regulators

LTC3728LCUH#TR Parametric

Parameter NameAttribute value
Is it Rohs certified?incompatible
MakerADI
package instructionHVQCCN,
Reach Compliance Codenot_compliant
ECCN codeEAR99
Other featuresALSO OPERATES IN ADJUSTABLE MODE FROM 4.8 V TO 5.2 V
Analog Integrated Circuits - Other TypesDUAL SWITCHING CONTROLLER
control modeCURRENT-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage30 V
Minimum input voltage3.6 V
Nominal input voltage15 V
JESD-30 codeS-PQCC-N32
JESD-609 codee0
length5 mm
Humidity sensitivity level1
Number of functions1
Number of terminals32
Maximum operating temperature85 °C
Minimum operating temperature
Maximum output current3 A
Nominal output voltage3.35 V
Package body materialPLASTIC/EPOXY
encapsulated codeHVQCCN
Package shapeSQUARE
Package formCHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
Peak Reflow Temperature (Celsius)235
Certification statusNot Qualified
Maximum seat height0.8 mm
surface mountYES
Switch configurationPHASE-SHIFT
Maximum switching frequency590 kHz
technologyCMOS
Temperature levelOTHER
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formNO LEAD
Terminal pitch0.5 mm
Terminal locationQUAD
Maximum time at peak reflow temperature20
width5 mm
FeaTures
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n
n
n
n
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n
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LTC3728L/LTC3728LX
Dual, 550kHz, 2-Phase
Synchronous Regulators
DescripTion
The LTC
®
3728L/LTC3728LX are dual high performance
step-down switching regulator controllers that drive 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.
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)
input supply range encompasses all battery chemistries.
A RUN/SS pin for each controller provides both soft-
start and optional timed, short-circuit shutdown. Current
foldback limits MOSFET 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. The LTC3728L/LTC3728LX include
a power good output pin that indicates when both outputs
are within 7.5% of their designed set point.
L,
LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode, OPTI-LOOP and PolyPhase
are registered trademarks of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
n
Dual, 180° Phased Controllers Reduce Required
Input Capacitance and Power Supply Induced Noise
OPTI-LOOP
®
Compensation Minimizes C
OUT
±1% Output Voltage Accuracy (LTC3728LC)
Power Good Output Voltage Indicator
Phase-Lockable Fixed Frequency 250kHz to 550kHz
Dual N-Channel MOSFET Synchronous Drive
Wide V
IN
Range: 4.5V to 28V Operation
Very Low Dropout Operation: 99% Duty Cycle
Adjustable Soft-Start Current Ramping
Foldback Output Current Limiting
Latched Short-Circuit Shutdown with Defeat Option
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
Notebook and Palmtop Computers
Telecom Systems
Portable Instruments
Battery-Operated Digital Devices
DC Power Distribution Systems
applicaTions
n
n
n
n
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Typical applicaTion
4.7µF
M1
L1
3.2µH
C
B1
, 0.1µF
D1
+
D3
V
IN
PGOOD INTV
CC
TG1
BOOST1
SW1
BG1
f
IN
500kHz
PLLIN
SENSE1
+
LTC3728L/
LTC3728LX
TG2
BOOST2
SW2
BG2
PGND
SENSE2
+
1000pF
SENSE1
V
OSENSE1
SENSE2
V
OSENSE2
I
TH2
C
SS2
0.1µF
C
C2
220pF
R
C2
15k
C
B2
, 0.1µF
D4
1µF
CERAMIC
M2
V
IN
5.2V TO 28V
C
IN
22µF
50V
CERAMIC
L2
3.2µH
D2
R
SENSE1
0.01Ω
V
OUT1
5V
5A
1000pF
R
SENSE2
0.01Ω
V
OUT2
3.3V
5A
+
C
OUT1
47µF
6V
SP
R2
105k
1%
R1
20k
1%
C
C1
220pF
R
C1
15k
I
TH1
C
SS1
0.1µF
RUN/SS1 SGND RUN/SS2
R3
20k
1%
R4
63.4k
1%
C
OUT
56µF
6V
SP
+
M1, M2: FDS6982S
Figure 1. High Efficiency Dual 5V/3.3V Step-Down Converter
3728 F01
3728lxff
1

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Description Switching Regulators LTC3728L and LX - Dual, 550kHz, 2-Phase Synchronous Regulators Switching Voltage Regulators 550kHz, dual, 2 Phase Controller Switching Voltage Regulators LTC3728L and LX - Dual, 550kHz, 2-Phase Synchronous Regulators Switching Voltage Regulators 550kHz, dual, 2 Phase Controller Switching Voltage Regulators 550kHz, dual, 2Phase Controller Switching Voltage Regulators 550kHz, dual, 2 Phase Controller Switching Regulator 550kHz, dual, 2 Phase Controller Switching Regulators LTC3728L and LX - Dual, 550kHz, 2-Phase Synchronous Regulators Switching Regulator 550kHz, Dual, 2 Phase Controller in QFN Package Switching Regulators LTC3728L and LX - Dual, 550kHz, 2-Phase Synchronous Regulators
Is it Rohs certified? incompatible conform to incompatible conform to conform to - conform to incompatible - incompatible
Maker ADI ADI ADI ADI ADI - ADI ADI ADI ADI
package instruction HVQCCN, HVQCCN, SSOP, HVQCCN, SSOP, - SSOP, SSOP, - HVQCCN,
Reach Compliance Code not_compliant compliant not_compliant compliant compliant - compliant not_compliant - not_compliant
Other features ALSO OPERATES IN ADJUSTABLE MODE FROM 4.8 V TO 5.2 V ALSO OPERATES IN ADJUSTABLE MODE FROM 4.8 V TO 5.2 V ALSO OPERATES IN ADJUSTABLE MODE FROM 4.8 V TO 5.2 V ALSO OPERATES IN ADJUSTABLE MODE FROM 4.8 V TO 5.2 V ALSO OPERATES IN ADJUSTABLE MODE FROM 4.8 V TO 5.2 V - ALSO OPERATES IN ADJUSTABLE MODE FROM 4.8 V TO 5.2 V ALSO OPERATES IN ADJUSTABLE MODE FROM 4.8 V TO 5.2 V - ALSO OPERATES IN ADJUSTABLE MODE FROM 4.8 V TO 5.2 V
Analog Integrated Circuits - Other Types DUAL SWITCHING CONTROLLER DUAL SWITCHING CONTROLLER DUAL SWITCHING CONTROLLER DUAL SWITCHING CONTROLLER DUAL SWITCHING CONTROLLER - DUAL SWITCHING CONTROLLER DUAL SWITCHING CONTROLLER - DUAL SWITCHING CONTROLLER
control mode CURRENT-MODE CURRENT-MODE CURRENT-MODE CURRENT-MODE CURRENT-MODE - CURRENT-MODE CURRENT-MODE - CURRENT-MODE
Control Technology PULSE WIDTH MODULATION PULSE WIDTH MODULATION PULSE WIDTH MODULATION PULSE WIDTH MODULATION PULSE WIDTH MODULATION - PULSE WIDTH MODULATION PULSE WIDTH MODULATION - PULSE WIDTH MODULATION
Maximum input voltage 30 V 30 V 30 V 30 V 30 V - 30 V 30 V 30 V 30 V
Minimum input voltage 3.6 V 3.6 V 3.6 V 3.6 V 3.6 V - 3.6 V 3.6 V 4 V 3.6 V
Nominal input voltage 15 V 15 V 15 V 15 V 15 V - 15 V 15 V - 15 V
JESD-30 code S-PQCC-N32 S-PQCC-N32 R-PDSO-G28 S-PQCC-N32 R-PDSO-G28 - R-PDSO-G28 R-PDSO-G28 - S-PQCC-N32
JESD-609 code e0 e3 e0 e3 e3 - e3 e0 - e0
length 5 mm 5 mm 9.893 mm 5 mm 9.893 mm - 9.893 mm 9.893 mm - 5 mm
Humidity sensitivity level 1 1 1 1 1 - 1 1 - 1
Number of functions 1 1 1 1 1 - 1 1 - 1
Number of terminals 32 32 28 32 28 - 28 28 - 32
Maximum operating temperature 85 °C 85 °C 85 °C 85 °C 85 °C - 85 °C 85 °C - 85 °C
Maximum output current 3 A 3 A 3 A 3 A 3 A - 3 A 3 A - 3 A
Nominal output voltage 3.35 V 3.35 V 3.35 V 3.35 V 3.35 V - 3.35 V 3.35 V - 3.35 V
Package body material PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY - PLASTIC/EPOXY PLASTIC/EPOXY - PLASTIC/EPOXY
encapsulated code HVQCCN HVQCCN SSOP HVQCCN SSOP - SSOP SSOP - HVQCCN
Package shape SQUARE SQUARE RECTANGULAR SQUARE RECTANGULAR - RECTANGULAR RECTANGULAR - SQUARE
Package form CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE SMALL OUTLINE, SHRINK PITCH CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE SMALL OUTLINE, SHRINK PITCH - SMALL OUTLINE, SHRINK PITCH SMALL OUTLINE, SHRINK PITCH - CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
Peak Reflow Temperature (Celsius) 235 260 235 260 260 - 260 235 - 235
Certification status Not Qualified Not Qualified Not Qualified Not Qualified Not Qualified - Not Qualified Not Qualified - Not Qualified
Maximum seat height 0.8 mm 0.8 mm 1.75 mm 0.8 mm 1.75 mm - 1.75 mm 1.75 mm - 0.8 mm
surface mount YES YES YES YES YES - YES YES - YES
Switch configuration PHASE-SHIFT PHASE-SHIFT PHASE-SHIFT PHASE-SHIFT PHASE-SHIFT - PHASE-SHIFT PHASE-SHIFT - PHASE-SHIFT
Maximum switching frequency 590 kHz 590 kHz 590 kHz 590 kHz 590 kHz - 590 kHz 590 kHz - 590 kHz
technology CMOS CMOS CMOS CMOS CMOS - CMOS CMOS - CMOS
Temperature level OTHER INDUSTRIAL OTHER INDUSTRIAL INDUSTRIAL - OTHER INDUSTRIAL - INDUSTRIAL
Terminal surface Tin/Lead (Sn/Pb) Matte Tin (Sn) Tin/Lead (Sn/Pb) Matte Tin (Sn) Matte Tin (Sn) - Matte Tin (Sn) Tin/Lead (Sn/Pb) - Tin/Lead (Sn/Pb)
Terminal form NO LEAD NO LEAD GULL WING NO LEAD GULL WING - GULL WING GULL WING - NO LEAD
Terminal pitch 0.5 mm 0.5 mm 0.635 mm 0.5 mm 0.635 mm - 0.635 mm 0.635 mm - 0.5 mm
Terminal location QUAD QUAD DUAL QUAD DUAL - DUAL DUAL - QUAD
Maximum time at peak reflow temperature 20 30 20 30 30 - 30 20 - 20
width 5 mm 5 mm 3.9 mm 5 mm 3.9 mm - 3.9 mm 3.9 mm - 5 mm
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