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LTC3828EUH#PBF

Description
DC/DC Cntrlr Dual-OUT Step Down 590kHz Automotive 32-Pin QFN EP Tube
File Size381KB,32 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Parametric Compare View All

LTC3828EUH#PBF Overview

DC/DC Cntrlr Dual-OUT Step Down 590kHz Automotive 32-Pin QFN EP Tube

LTC3828EUH#PBF Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesCompliant
ECCN (US)EAR99
Part StatusActive
HTS8542.39.00.01
Number of Outputs2
TopologyStep Down
Output Voltage (V)0.8 to 7
Maximum Switching Frequency (kHz)590
Minimum Input Voltage (V)4.5
Maximum Input Voltage (V)28
Operating Supply Voltage (V)4.5 to 28
Maximum Supply Current (mA)3
Minimum Switching Frequency (kHz)480
Typical Switching Frequency (kHz)550
Synchronous RectifierYes
Synchronous ClockYes
Control MethodPWM
ProgrammabilityNo
Minimum Operating Temperature (°C)-40
Maximum Operating Temperature (°C)85
Supplier Temperature GradeExtended
PackagingTube
Pin Count32
Standard Package NameQFN
Supplier PackageQFN EP
MountingSurface Mount
Package Height0.75(Max)
Package Length5
Package Width5
PCB changed32
Lead ShapeNo Lead
FEATURES
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
LTC3828
Dual, 2-Phase Step-Down
Controller with Tracking
DESCRIPTION
The LTC
®
3828 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 for a phase-lockable
frequency of up to 550kHz. The TRCKSS pin provides both
soft-start and tracking functions. Multiple LTC3828s can
be daisy-chained in applications requiring more than two
voltages to be tracked.
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 a wide 4.5V to
28V (30V maximum) input supply range, encompassing
all battery chemistries.
The RUN pins control their respective channels indepen-
dently. The FCB/PLLIN pin selects among Burst Mode
®
operation, skip-cycle mode and continuous current mode.
Current foldback limits MOSFET dissipation during short-
circuit conditions. Reverse current and current foldback
functions are disabled during soft-start.
L,
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, 5705919, 5929620, 6144194, 6177787,
6304066, 6580258
Dual, 180° Phased Controllers Reduce Required
Input Capacitance and Power Supply Induced Noise
Tracking for Both Outputs
Constant Frequency Current Mode Control
Wide V
IN
Range: 4.5V to 28V Operation
Power Good Output Voltage Indicator
Adjustable Soft-Start Current Ramping
Foldback Output Current Limiting–
Disabled at Start-Up
No Reverse Current During Soft-Start Interval
Clock Output for 3-, 4-, 6-Phase Operation
Dual N-Channel MOSFET Synchronous Drive
±1% Output Voltage Accuracy
Phase-Lockable Fixed Frequency 260kHz to 550kHz
OPTI-LOOP
®
Compensation Minimizes C
OUT
Very Low Dropout Operation: 99% Duty Cycle
Output Overvoltage Protection
Small 28-Lead SSOP and 5mm
×
5mm QFN
Packages
APPLICATIONS
n
n
n
Telecom Infrastructure
ASIC Power Supply
Industry Equipment
TYPICAL APPLICATION
High Efficiency Dual 2.5V/3.3V Step-Down Converter with Tracking
+
4.7μF
V
IN
PGOOD INTV
CC
TG1
0.1μF
3.2μH
BOOST1
SW1
BG1
500kHz
LTC3828
TG2
BOOST2
SW2
BG2
PGND
SENSE2
+
1000pF
SENSE1
V
OSENSE1
63.4k 1%
63.4k 1%
20k
1%
20k
1%
TRCKSS2
I
TH1
220pF
15k
RUN1
SGND
SENSE2
V
OSENSE2
TRCKSS1
I
TH2
RUN2
220pF
15k
0.1μF
TRCKSS1
42.5k
1%
20k
1%
0.01Ω
2.5V
5A
0.1μF
3.2μH
1μF
CERAMIC
4.5V TO 28V
22μF
50V
CERAMIC
FCB/PLLIN
SENSE1
+
0.01Ω
3.3V
5A
1000pF
+
47μF
4V
SP
+
56μF
4V
SP
3828 TA01
3828fc
1

LTC3828EUH#PBF Related Products

LTC3828EUH#PBF LTC3828EG#PBF LTC3828EG#TRPBF LTC3828EUH#TRPBF
Description DC/DC Cntrlr Dual-OUT Step Down 590kHz Automotive 32-Pin QFN EP Tube DC/DC Cntrlr Dual-OUT Step Down 590kHz Automotive 28-Pin SSOP Tube DC/DC Cntrlr Dual-OUT Step Down 590kHz Automotive 28-Pin SSOP T/R DC/DC Cntrlr Dual-OUT Step Down 590kHz Automotive 32-Pin QFN EP 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
HTS 8542.39.00.01 8542.39.00.01 8542.39.00.01 8542.39.00.01
Number of Outputs 2 2 2 2
Topology Step Down Step Down Step Down Step Down
Output Voltage (V) 0.8 to 7 0.8 to 7 0.8 to 7 0.8 to 7
Maximum Switching Frequency (kHz) 590 590 590 590
Minimum Input Voltage (V) 4.5 4.5 4.5 4.5
Maximum Input Voltage (V) 28 28 28 28
Operating Supply Voltage (V) 4.5 to 28 4.5 to 28 4.5 to 28 4.5 to 28
Maximum Supply Current (mA) 3 3 3 3
Minimum Switching Frequency (kHz) 480 480 480 480
Typical Switching Frequency (kHz) 550 550 550 550
Synchronous Rectifier Yes Yes Yes Yes
Synchronous Clock Yes Yes Yes Yes
Control Method PWM PWM PWM PWM
Programmability No No No No
Minimum Operating Temperature (°C) -40 -40 -40 -40
Maximum Operating Temperature (°C) 85 85 85 85
Supplier Temperature Grade Extended Extended Extended Extended
Packaging Tube Tube Tape and Reel Tape and Reel
Pin Count 32 28 28 32
Standard Package Name QFN SOP SOP QFN
Supplier Package QFN EP SSOP SSOP QFN EP
Mounting Surface Mount Surface Mount Surface Mount Surface Mount
Package Height 0.75(Max) 2(Max) - 0.05(Min) 2(Max) - 0.05(Min) 0.75(Max)
Package Length 5 10.5(Max) 10.5(Max) 5
Package Width 5 5.6(Max) 5.6(Max) 5
PCB changed 32 28 28 32
Lead Shape No Lead Gull-wing Gull-wing No Lead
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