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LTC3827IG-1#PBF

Description
Switching Voltage Regulators Dual, 2-Phase Step-Down Controller
CategoryPower/power management    The power supply circuit   
File Size442KB,32 Pages
ManufacturerADI
Websitehttps://www.analog.com
Environmental Compliance
Download Datasheet Parametric Compare View All

LTC3827IG-1#PBF Overview

Switching Voltage Regulators Dual, 2-Phase Step-Down Controller

LTC3827IG-1#PBF Parametric

Parameter NameAttribute value
Brand NameAnalog Devices Inc
Is it lead-free?Contains lead
Is it Rohs certified?conform to
package instructionSSOP,
Contacts28
Manufacturer packaging code05-08-1640 (G28)
Reach Compliance Codecompliant
Other featuresALSO OPERATES IN ADJUSTABLE MODE FROM 0.8 TO 10V
Analog Integrated Circuits - Other TypesDUAL SWITCHING CONTROLLER
control modeCURRENT-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage36 V
Minimum input voltage4 V
Nominal input voltage12 V
JESD-30 codeR-PDSO-G28
JESD-609 codee3
length10.2 mm
Humidity sensitivity level1
Number of functions1
Number of terminals28
Maximum operating temperature85 °C
Minimum operating temperature-40 °C
Maximum output current3 A
Nominal output voltage5.25 V
Package body materialPLASTIC/EPOXY
encapsulated codeSSOP
Package shapeRECTANGULAR
Package formSMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius)260
Certification statusNot Qualified
Maximum seat height2 mm
surface mountYES
Switch configurationPHASE-SHIFT
Maximum switching frequency650 kHz
technologyCMOS
Temperature levelINDUSTRIAL
Terminal surfaceMATTE TIN
Terminal formGULL WING
Terminal pitch0.65 mm
Terminal locationDUAL
Maximum time at peak reflow temperature30
width5.3 mm
Base Number Matches1
FEATURES
n
n
n
LTC3827-1
Low I
Q
, Dual, 2-Phase
Synchronous Step-Down Controller
DESCRIPTION
The LTC
®
3827-1 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 a phase-lockable fre-
quency of up to 650kHz. Power loss and noise due to the
ESR of the input capacitor ESR are minimized by operating
the two controller output stages out of phase.
The 80μA no-load quiescent current extends operating
life in battery-powered systems. OPTI-LOOP compensa-
tion allows the transient response to be optimized over
a wide range of output capacitance and ESR values. The
LTC3827-1 features a precision 0.8V reference and a power
good output indicator. A wide 4V to 36V input supply range
encompasses all battery chemistries.
Independent TRACK/SS pins for each controller ramp the
output voltage during start-up. Current foldback limits
MOSFET heat dissipation during short-circuit conditions.
The PLLIN/MODE pin selects among Burst Mode opera-
tion, pulse-skipping mode, or continuous inductor cur-
rent mode at light loads. For a leadless package version
(5mm × 5mm QFN) with additional features, see the
LTC3827 data sheet.
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, 5929620, 6177787, 6144194, 5408150,
6580258, 6304066, 5705919.
n
n
n
n
n
n
n
n
n
n
n
n
n
n
Wide Output Voltage Range: 0.8V ≤ V
OUT
≤ 10V
Low Operating I
Q
: 80μA (One Channel On)
Out-of-Phase Controllers Reduce Required Input
Capacitance and Power Supply Induced Noise
OPTI-LOOP
®
Compensation Minimizes C
OUT
±1% Output Voltage Accuracy
Wide V
IN
Range: 4V to 36V Operation
Phase-Lockable Fixed Frequency 140kHz to 650kHz
Selectable Continuous, Pulse-Skipping or
Low Ripple
Burst Mode
®
Operation at Light Loads
Dual N-Channel MOSFET Synchronous Drive
Very Low Dropout Operation: 99% Duty Cycle
Adjustable Output Voltage Soft-Start or Tracking
Output Current Foldback Limiting
Power Good Output Voltage Monitor
Output Overvoltage Protection
Low Shutdown I
Q
: 8μA
Internal LDO Powers Gate Drive from V
IN
or V
OUT
Small 28-Lead SSOP Package
APPLICATIONS
n
n
n
Automotive Systems
Battery-Operated Digital Devices
Distributed DC Power Systems
TYPICAL APPLICATION
High Efficiency Dual 8.5V/3.3V Step-Down Converter
+
4.7μF
V
IN
TG1
3.3μH
0.1μF
BOOST1
SW1
BG1
LTC3827-1
SENSE1
+
0.015Ω
V
OUT1
3.3V
5A
SENSE1
V
FB1
62.5k
150μF
220pF
20k
15k
I
TH1
SENSE2
V
FB2
I
TH2
220pF
15k
20k
192.5k
INTV
CC
TG2
BOOST2
SW2
BG2
PGND
SENSE2
+
0.015Ω
V
OUT2
8.5V
3.5A
150μF
0.1μF
EFFICIENCY (%)
7.2μH
V
IN
4V TO 36V
1μF
22μF
50V
100
90
80
70
60
50
40
30
20
10
0
0.001 0.01
0.1
0.1
1
10 100 1000 10000
LOAD CURRENT (mA)
38271 TA01b
Efficiency and Power Loss
vs Load Current
100000
EFFICIENCY
V
IN
= 12V; V
OUT
= 3.3V
10000
POWER LOSS (mW)
1000
100
POWER LOSS
10
1
TRACK/SS1 SGND TRACK/SS2
0.1μF
0.1μF
FIGURE 13 CIRCUIT
38271 TA01
38271fe
1

LTC3827IG-1#PBF Related Products

LTC3827IG-1#PBF LTC3827IG-1#TRPBF
Description Switching Voltage Regulators Dual, 2-Phase Step-Down Controller Switching Voltage Regulators Dual, 2-Phase Step-Down Controller
Brand Name Analog Devices Inc Analog Devices Inc
Is it lead-free? Contains lead Contains lead
Is it Rohs certified? conform to conform to
package instruction SSOP, SSOP,
Contacts 28 28
Manufacturer packaging code 05-08-1640 (G28) 05-08-1640 (G28)
Reach Compliance Code compliant compliant
Other features ALSO OPERATES IN ADJUSTABLE MODE FROM 0.8 TO 10V ALSO OPERATES IN ADJUSTABLE MODE FROM 0.8 TO 10V
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 36 V 36 V
Minimum input voltage 4 V 4 V
Nominal input voltage 12 V 12 V
JESD-30 code R-PDSO-G28 R-PDSO-G28
JESD-609 code e3 e3
length 10.2 mm 10.2 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
Nominal output voltage 5.25 V 5.25 V
Package body material PLASTIC/EPOXY PLASTIC/EPOXY
encapsulated code SSOP SSOP
Package shape RECTANGULAR RECTANGULAR
Package form SMALL OUTLINE, SHRINK PITCH SMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius) 260 260
Certification status Not Qualified Not Qualified
Maximum seat height 2 mm 2 mm
surface mount YES YES
Switch configuration PHASE-SHIFT PHASE-SHIFT
Maximum switching frequency 650 kHz 650 kHz
technology CMOS CMOS
Temperature level INDUSTRIAL INDUSTRIAL
Terminal surface MATTE TIN Matte Tin (Sn)
Terminal form GULL WING GULL WING
Terminal pitch 0.65 mm 0.65 mm
Terminal location DUAL DUAL
Maximum time at peak reflow temperature 30 30
width 5.3 mm 5.3 mm
Base Number Matches 1 1
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