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LTC3836EGN

Description
Switching Voltage Regulators LTC3836 - Dual 2-Phase, No RSENSE Low VIN Synchronous Controller
CategoryPower/power management    The power supply circuit   
File Size481KB,30 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Download user manual Parametric Compare View All

LTC3836EGN Overview

Switching Voltage Regulators LTC3836 - Dual 2-Phase, No RSENSE Low VIN Synchronous Controller

LTC3836EGN Parametric

Parameter NameAttribute value
Is it Rohs certified?incompatible
MakerADI
package instruction0.150 INCH, PLASTIC, SSOP-28
Reach Compliance Codenot_compliant
ECCN codeEAR99
Analog Integrated Circuits - Other TypesDUAL SWITCHING CONTROLLER
control modeCURRENT-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage4.5 V
Minimum input voltage2.75 V
Nominal input voltage3.3 V
JESD-30 codeR-PDSO-G28
JESD-609 codee0
length9.893 mm
Humidity sensitivity level1
Number of functions1
Number of terminals28
Maximum operating temperature85 °C
Minimum operating temperature
Package body materialPLASTIC/EPOXY
encapsulated codeSSOP
Package shapeRECTANGULAR
Package formSMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius)235
Certification statusNot Qualified
Maximum seat height1.75 mm
surface mountYES
Switch configurationPHASE-SHIFT
Maximum switching frequency825 kHz
Temperature levelCOMMERCIAL EXTENDED
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formGULL WING
Terminal pitch0.635 mm
Terminal locationDUAL
Maximum time at peak reflow temperature20
width3.899 mm
LTC3836
Dual 2-Phase,
No R
SENSE
TM
Low V
IN
Synchronous Controller
FEATURES
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
DESCRIPTION
The LTC
®
3836 is a 2-phase dual output synchronous
step-down switching regulator controller with tracking
that drives external N-channel power MOSFETs using few
external components. The constant-frequency current
mode architecture with MOSFET V
DS
sensing eliminates
the need for sense resistors and improves efficiency.
The power loss and noise due to the ESR of the input
capacitance are minimized by operating the two control-
lers out-of-phase. Pulse-skipping operation provides high
efficiency at light loads. The 97% duty cycle capability
provides low dropout operation, extending operating time
in battery-powered systems.
The operating frequency is selectable from 300kHz to
750kHz, allowing the use of small surface mount induc-
tors and capacitors. For noise sensitive applications, the
LTC3836 operating frequency can be externally synchro-
nized from 250kHz to 850kHz.
The LTC3836 features an internal 1ms soft-start that can
be extended with an external capacitor. A tracking input al-
lows the second output to track the first during start-up.
The LTC3836 is available in the tiny thermally enhanced
(4mm
×
5mm) QFN and 28-lead narrow SSOP packages.
No Current Sense Resistors Required
Out-of-Phase Controllers Reduce Required Input
Capacitance
All N-Channel Synchronous Drive
V
IN
Range: 2.75V to 4.5V
Constant-Frequency Current Mode Operation
0.6V
±1.5%
Voltage Reference
Low Dropout Operation: 97% Duty Cycle
True PLL for Frequency Locking or Adjustment
Selectable Pulse-Skipping/Continuous Operation
Tracking Function
Internal Soft-Start Circuitry
Power Good Output Voltage Monitor
Output Overvoltage Protection
Micropower Shutdown: I
Q
= 6.5μA
Tiny Low Profile (4mm
×
5mm) QFN and Narrow
SSOP Packages
APPLICATIONS
n
n
n
General Purpose 3.3V to 1.X Supplies
Single Lithium-Ion Powered Devices
Distributed DC Power Systems
L,
LT, LTC, LTM, Linear Technology, Burst Mode, OPTI-LOOP and the Linear logo are
registered trademarks and No R
SENSE
is a trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Protected by U.S. Patents including
5481178, 5929620, 6144194, 6304066, 6498466, 6580258, 6611131.
TYPICAL APPLICATION
High Efficiency, 2-Phase, Dual Synchronous DC/DC Step-Down Converter
V
IN
BOOST1 BOOST2
SENSE1
+
SENSE2
+
TG1
0.47μH
SW1
LTC3836
BG1
V
OUT1
1.8V AT
15A
118k
820pF
100μF
×
2
59k
15k
V
FB1
I
TH1
SGND
BG2
PGND
V
FB2
I
TH2
59k
820pF
59k
15k
V
OUT2
1.2V AT
15A
100μF
×
2
3836 TA01
Efficiency/Power Loss vs Load Current
100
90
80
EFFICIENCY (%)
70
60
50
40
30
20
10
0
10
CIRCUIT OF FIGURE 15
100
1000
10000
LOAD CURRENT (mA)
1
100000
3836 TA01b
22μF
×
3
V
IN
3.3V
3.3V-1.8V
EFFICIENCY
3.3V-1.2V
EFFICIENCY
10000
1000
POWER LOSS (mW)
TG2
SW2
0.47μH
100
3.3V-1.2V
POWER LOSS
3.3V-1.8V
POWER LOSS
10
3836fb
1

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Description Switching Voltage Regulators LTC3836 - Dual 2-Phase, No RSENSE Low VIN Synchronous Controller Switching Voltage Regulators LTC3836 - Dual 2-Phase, No RSENSE Low VIN Synchronous Controller Switching Voltage Regulators LTC3836 - Dual 2-Phase, No RSENSE Low VIN Synchronous Controller
Is it Rohs certified? incompatible incompatible incompatible
Maker ADI ADI ADI
package instruction 0.150 INCH, PLASTIC, SSOP-28 HVQCCN, 0.150 INCH, PLASTIC, SSOP-28
Reach Compliance Code not_compliant compliant not_compliant
ECCN code EAR99 EAR99 EAR99
Analog Integrated Circuits - Other Types DUAL SWITCHING CONTROLLER DUAL SWITCHING CONTROLLER DUAL SWITCHING CONTROLLER
control mode CURRENT-MODE CURRENT-MODE CURRENT-MODE
Control Technology PULSE WIDTH MODULATION PULSE WIDTH MODULATION PULSE WIDTH MODULATION
Maximum input voltage 4.5 V 4.5 V 4.5 V
Minimum input voltage 2.75 V 2.75 V 2.75 V
Nominal input voltage 3.3 V 3.3 V 3.3 V
JESD-30 code R-PDSO-G28 R-PQCC-N28 R-PDSO-G28
JESD-609 code e0 e0 e0
length 9.893 mm 5 mm 9.893 mm
Humidity sensitivity level 1 1 1
Number of functions 1 1 1
Number of terminals 28 28 28
Maximum operating temperature 85 °C 85 °C 85 °C
Package body material PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY
encapsulated code SSOP HVQCCN SSOP
Package shape RECTANGULAR RECTANGULAR RECTANGULAR
Package form SMALL OUTLINE, SHRINK PITCH CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE SMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius) 235 235 235
Certification status Not Qualified Not Qualified Not Qualified
Maximum seat height 1.75 mm 0.8 mm 1.75 mm
surface mount YES YES YES
Switch configuration PHASE-SHIFT PHASE-SHIFT PHASE-SHIFT
Maximum switching frequency 825 kHz 825 kHz 825 kHz
Temperature level COMMERCIAL EXTENDED COMMERCIAL EXTENDED COMMERCIAL EXTENDED
Terminal surface Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb)
Terminal form GULL WING NO LEAD GULL WING
Terminal pitch 0.635 mm 0.5 mm 0.635 mm
Terminal location DUAL QUAD DUAL
Maximum time at peak reflow temperature 20 20 20
width 3.899 mm 4 mm 3.899 mm
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