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LTC3736EUF-2#PBF

Description
DC/DC Cntrlr Dual-OUT Step Down 850kHz 24-Pin QFN EP Tube
File Size348KB,28 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Parametric Compare View All

LTC3736EUF-2#PBF Overview

DC/DC Cntrlr Dual-OUT Step Down 850kHz 24-Pin QFN EP Tube

LTC3736EUF-2#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)0.6 to 9.8
Maximum Switching Frequency (kHz)850
Minimum Input Voltage (V)2.75
Maximum Input Voltage (V)9.8
Operating Supply Voltage (V)2.75 to 9.8
Maximum Supply Current (mA)0.75
Minimum Switching Frequency (kHz)250
Minimum Operating Temperature (°C)-40
Maximum Operating Temperature (°C)85
Supplier Temperature GradeExtended
PackagingTube
Pin Count24
Standard Package NameQFN
Supplier PackageQFN EP
MountingSurface Mount
Package Height0.75(Max)
Package Length4
Package Width4
PCB changed24
Lead ShapeNo Lead
FEATURES
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LTC3736-2
Dual 2-Phase, No R
SENSE
,
Synchronous Controller
with Output Tracking
DESCRIPTION
TM
No Current Sense Resistors Required
Out-of-Phase Controllers Reduce Required
Input Capacitance
Tracking Function
Wide V
IN
Range: 2.75V to 9.8V
0.6V ±1% Voltage Reference
High Current Limit
Constant-Frequency Current Mode Operation
Low Dropout Operation: 100% Duty Cycle
True PLL for Frequency Locking or Adjustment
Selectable Pulse-Skipping/Forced Continuous
Operation
Auxiliary Winding Regulation
Internal Soft-Start Circuitry
Power Good Output Voltage Monitor
Output Overvoltage Protection
Micropower Shutdown: I
Q
= 9μA
Tiny Low Profile (4mm
×
4mm) QFN and Narrow
SSOP Packages
The LTC
®
3736-2 is a 2-phase dual synchronous step-down
switching regulator controller with tracking that drives
external complementary power MOSFETs using few ex-
ternal components. The constant-frequency current mode
architecture with MOSFET V
DS
sensing eliminates the need
for sense resistors and improves efficiency. Power loss and
noise due to the ESR of the input capacitance are minimized
by operating the two controllers out-of-phase.
Pulse-skipping operation provides high efficiency at light
loads. 100% duty cycle capability provides low dropout
operation, extending operating time in battery-powered
systems.
The switching frequency can be programmed up to 750kHz,
allowing the use of small surface mount inductors and
capacitors. For noise sensitive applications, the LTC3736-2
switching frequency can be externally synchronized from
250kHz to 850kHz. An internal soft-start, which can be
lengthened externally, smoothly ramps the output voltage
during start-up.
The LTC3736-2 is available in the tiny thermally enhanced
(4mm
×
4mm) QFN and 24-lead narrow SSOP packages.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
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, 6580258, 6304066, 6611131, 6498466.
APPLICATIONS
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One or Two Lithium-Ion Powered Devices
Notebook and Palmtop Computers, PDAs
Portable Instruments
Distributed DC Power Systems
TYPICAL APPLICATION
High Efficiency, 2-Phase, Dual Synchronous DC/DC Step-Down Converter
V
IN
2.75V TO 9.8V
V
IN
SENSE1
+
TG1
2.2μH
SW1
BG1
V
OUT1
2.5V
187k
PGND
V
FB1
220pF
59k
15k
I
TH1
SGND
SW2
LTC3736-2
BG2
PGND
V
FB2
I
TH2
220pF
15k
59k
37362 TA01a
Efficiency and Power Loss
vs Load Current (Figure 15 Circuit)
100
95
90
V
OUT
= 2.5V
10
SENSE2
+
10μF
2
TG2
2.2μH
EFFICIENCY (%)
85
80
75
70
65
60
55
EFFICIENCY
1
POWER LOSS (W)
0.1
POWER LOSS
118k
V
OUT2
1.8V
47μF
0.01
47μF
50
1
10
100
1000
LOAD CURRENT (mA)
0.001
10000
37362 TA01b
37362fb
1

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Description DC/DC Cntrlr Dual-OUT Step Down 850kHz 24-Pin QFN EP Tube DC/DC Cntrlr Dual-OUT Step Down 850kHz 24-Pin SSOP N Tube DC/DC Cntrlr Dual-OUT Step Down 850kHz 24-Pin SSOP N T/R DC/DC Cntrlr Dual-OUT Step Down 850kHz 24-Pin SSOP N DC/DC Cntrlr Dual-OUT Step Down 850kHz 24-Pin QFN EP T/R DC/DC Cntrlr Dual-OUT Step Down 850kHz 24-Pin QFN EP
EU restricts the use of certain hazardous substances Compliant Compliant Compliant Not Compliant Compliant Not Compliant
ECCN (US) EAR99 EAR99 EAR99 EAR99 EAR99 EAR99
Part Status Active Active Active Unconfirmed Active Unconfirmed
HTS 8542.39.00.01 8542.39.00.01 8542.39.00.01 8542.39.00.01 8542.39.00.01 8542.39.00.01
Number of Outputs 2 2 2 2 2 2
Topology Step Down Step Down Step Down Step Down Step Down Step Down
Output Voltage (V) 0.6 to 9.8 0.6 to 9.8 0.6 to 9.8 0.6 to 9.8 0.6 to 9.8 0.6 to 9.8
Maximum Switching Frequency (kHz) 850 850 850 850 850 850
Minimum Input Voltage (V) 2.75 2.75 2.75 2.75 2.75 2.75
Maximum Input Voltage (V) 9.8 9.8 9.8 9.8 9.8 9.8
Operating Supply Voltage (V) 2.75 to 9.8 2.75 to 9.8 2.75 to 9.8 2.75 to 9.8 2.75 to 9.8 2.75 to 9.8
Maximum Supply Current (mA) 0.75 0.75 0.75 0.75 0.75 0.75
Minimum Switching Frequency (kHz) 250 250 250 250 250 250
Minimum Operating Temperature (°C) -40 -40 -40 -40 -40 -40
Maximum Operating Temperature (°C) 85 85 85 85 85 85
Supplier Temperature Grade Extended Extended Extended Extended Extended Extended
Pin Count 24 24 24 24 24 24
Standard Package Name QFN SOP SOP SOP QFN QFN
Supplier Package QFN EP SSOP N SSOP N SSOP N QFN EP QFN EP
Mounting Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount
Package Height 0.75(Max) 1.5(Max) 1.5(Max) 1.5(Max) 0.75(Max) 0.75(Max)
Package Length 4 8.74(Max) 8.74(Max) 8.74(Max) 4 4
Package Width 4 3.99(Max) 3.99(Max) 3.99(Max) 4 4
PCB changed 24 24 24 24 24 24
Lead Shape No Lead Gull-wing Gull-wing Gull-wing No Lead No Lead
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