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LTC3728LZEUH

Description
Dual Switching Controller, Current-mode, 3A, 590kHz Switching Freq-Max, PQCC28
CategoryPower/power management    The power supply circuit   
File Size468KB,32 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Download user manual Parametric Compare View All

LTC3728LZEUH Overview

Dual Switching Controller, Current-mode, 3A, 590kHz Switching Freq-Max, PQCC28

LTC3728LZEUH Parametric

Parameter NameAttribute value
Is it Rohs certified?incompatible
Objectid4002735842
package instruction5 X 5 MM, PLASTIC, MO-220WHHD, QFN-28
Reach Compliance Codenot_compliant
ECCN codeEAR99
Analog Integrated Circuits - Other TypesDUAL SWITCHING CONTROLLER
control modeCURRENT-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage28 V
Minimum input voltage4.5 V
Nominal input voltage15 V
JESD-30 codeR-PQCC-N28
JESD-609 codee0
length5 mm
Humidity sensitivity level1
Number of functions1
Number of terminals28
Maximum operating temperature85 °C
Minimum operating temperature-40 °C
Maximum output current3 A
Package body materialPLASTIC/EPOXY
encapsulated codeHVQCCN
Package shapeRECTANGULAR
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 configurationPUSH-PULL
Maximum switching frequency590 kHz
Temperature levelINDUSTRIAL
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formNO LEAD
Terminal pitch0.5 mm
Terminal locationQUAD
Maximum time at peak reflow temperature20
width5 mm
FEATURES
LTC3728LZ
Dual, 550kHz, 2-Phase
Synchronous Regulators
DESCRIPTION
The LTC
®
3728LZ 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.
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 microprocessor
generations, and a wide 4.5V to 28V (30V maximum) input
supply range encompasses all battery chemistries.
The FBC mode pin can select among Burst Mode operation,
constant frequency mode and continous current mode.
Part
Number
LTC3728L
LTC3728LX
LTC3728LZ
V
REF
Accuracy
Overtemperature
±1% (C grade)
±1.5%
±1.5%
Current Limit Latch-Off
with Defeat Option
Yes
Foldback Only
Yes
Yes
3.3V LDO
Available
Yes
Yes
Yes
No
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
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 Regulator
3 Selectable Operating Modes: Constant Frequency,
Burst Mode
®
Operation and PWM
Available in 32 pin 5mm
×
5mm QFN Package
APPLICATIONS
LTC3728L-1 ±1.5%
Notebook and Palmtop Computers
Telecom Systems
Portable Instruments
Battery-Operated Digital Devices
DC Power Distribution Systems
, LT, LTC, LTM, 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.
TYPICAL APPLICATION
+
4.7µF
M1
L1
3.2µH
D3
V
IN
PGOOD INTV
CC
TG1
C
B1
, 0.1µF
BOOST1
SW1
BG1
f
IN
500kHz
PLLIN
SENSE1
+
R
SENSE1
0.01Ω
V
OUT1
5V
5A
1000pF
SENSE1
V
OSENSE1
C
C1
220pF
R
C1
15k
I
TH1
C
SS1
0.1µF
SENSE2
V
OSENSE2
I
TH2
C
SS2
0.1µF
C
C2
220pF
R
C2
15k
R4
63.4k
1%
C
OUT
56µF
6V
SP
LTC3728LZ
TG2
BOOST2
SW2
BG2
PGND
SENSE2
+
1000pF
R
SENSE2
0.01Ω
C
B2
, 0.1µF
L2
3.2µH
D4
1µF
M2
C
IN
22µF
50V
V
IN
5.2V TO 28V
+
R2
105k
C
OUT1
1%
47µF
6V
SP
M1, M2: FDS6982S
R1
20k
1%
RUN/SS1 SGND RUN/SS2
V
OUT2
3.3V
5A
R3
20k
1%
+
3728LZ F01
Figure 1. High Efficiency Dual 5V/3.3V Step-Down Converter
3728lzf
1

LTC3728LZEUH Related Products

LTC3728LZEUH LTC3728LZEUH#PBF
Description Dual Switching Controller, Current-mode, 3A, 590kHz Switching Freq-Max, PQCC28 LTC3728LZEUH#PBF
Is it Rohs certified? incompatible conform to
Objectid 4002735842 4002729869
package instruction 5 X 5 MM, PLASTIC, MO-220WHHD, QFN-28 HVQCCN,
Reach Compliance Code not_compliant compliant
Analog Integrated Circuits - Other Types DUAL SWITCHING CONTROLLER DUAL SWITCHING CONTROLLER
control mode CURRENT-MODE CURRENT-MODE
Control Technology PULSE WIDTH MODULATION PULSE WIDTH MODULATION
Maximum input voltage 28 V 28 V
Minimum input voltage 4.5 V 4.5 V
Nominal input voltage 15 V 15 V
JESD-30 code R-PQCC-N28 R-PQCC-N28
JESD-609 code e0 e3
length 5 mm 5 mm
Humidity sensitivity level 1 1
Number of functions 1 1
Number of terminals 28 28
Maximum operating temperature 85 °C 85 °C
Minimum operating temperature -40 °C -40 °C
Maximum output current 3 A 3 A
Package body material PLASTIC/EPOXY PLASTIC/EPOXY
encapsulated code HVQCCN HVQCCN
Package shape RECTANGULAR RECTANGULAR
Package form CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
Peak Reflow Temperature (Celsius) 235 260
Certification status Not Qualified Not Qualified
Maximum seat height 0.8 mm 0.8 mm
surface mount YES YES
Switch configuration PUSH-PULL PUSH-PULL
Maximum switching frequency 590 kHz 590 kHz
Temperature level INDUSTRIAL INDUSTRIAL
Terminal surface Tin/Lead (Sn/Pb) MATTE TIN
Terminal form NO LEAD NO LEAD
Terminal pitch 0.5 mm 0.5 mm
Terminal location QUAD QUAD
Maximum time at peak reflow temperature 20 30
width 5 mm 5 mm
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