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LTC3736EGN

Description
DC/DC Cntrlr Dual-OUT Step Down 850kHz 24-Pin SSOP N
File Size405KB,28 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Download user manual Parametric Compare View All

LTC3736EGN Overview

DC/DC Cntrlr Dual-OUT Step Down 850kHz 24-Pin SSOP N

LTC3736EGN Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesNot Compliant
ECCN (US)EAR99
Part StatusUnconfirmed
HTS8542.39.00.01
SVHCYes
SVHC Exceeds ThresholdYes
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)0.425
Minimum Switching Frequency (kHz)250
Control MethodPWM
Minimum Operating Temperature (°C)-40
Maximum Operating Temperature (°C)85
Supplier Temperature GradeExtended
Pin Count24
Standard Package NameSOP
Supplier PackageSSOP N
MountingSurface Mount
Package Height1.5(Max)
Package Length8.74(Max)
Package Width3.99(Max)
PCB changed24
Lead ShapeGull-wing
LTC3736
Dual 2-Phase, No R
SENSE
TM
,
Synchronous Controller
with Output Tracking
FEATURES
DESCRIPTIO
No Current Sense Resistors Required
Out-of-Phase Controllers Reduce Required
Input Capacitance
Tracking Function
Wide V
IN
Range: 2.75V to 9.8V
Constant Frequency Current Mode Operation
0.6V
±1.5%
Voltage Reference
Low Dropout Operation: 100% Duty Cycle
True PLL for Frequency Locking or Adjustment
Selectable Burst Mode
®
/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 is a 2-phase dual synchronous step-down
switching regulator controller with tracking that drives
external complementary power MOSFETs using few exter-
nal 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.
Burst Mode 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 ca-
pacitors. For noise sensitive applications, the LTC3736
switching frequency can be externally synchronized from
250kHz to 850kHz. Burst Mode operation is inhibited dur-
ing synchronization or when the SYNC/FCB pin is pulled low
in order to reduce noise and RF interference. Automatic soft-
start is internally controlled.
The LTC3736 is available in the tiny thermally enhanced
(4mm
×
4mm) QFN package or 24-lead SSOP narrow
package.
, LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode
is a registered trademark 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.
APPLICATIO S
One or Two Lithium-Ion Powered Devices
Notebook and Palmtop Computers, PDAs
Portable Instruments
Distributed DC Power Systems
TYPICAL APPLICATIO
High Efficiency, 2-Phase, Dual Synchronous DC/DC Step-Down Converter
V
IN
2.75V TO 9.8V
V
IN
SENSE1
+
SENSE2
+
TG1
2.2µH
SW1
LTC3736
BG1
V
OUT1
2.5V
187k
PGND
V
FB1
220pF
59k
15k
I
TH1
SGND
BG2
PGND
V
FB2
I
TH2
220pF
15k
59k
3736 TA01a
10µF
×2
EFFICIENCY (%)
TG2
SW2
2.2µH
118k
V
OUT2
1.8V
47µF
47µF
U
Efficiency vs Load Current
100
95
90
85
80
75
70
65
60
55
50
1
FIGURE 16 CIRCUIT
V
OUT
= 2.5V
100
1000
10
LOAD CURRENT (mA)
10000
3736 TA01b
U
U
V
IN
= 3.3V
V
IN
= 4.2V
V
IN
= 5V
3736fa
1

LTC3736EGN Related Products

LTC3736EGN LTC3736EGN#PBF LTC3736EGN#TR LTC3736EGN#TRPBF LTC3736EUF#PBF LTC3736EUF#TR LTC3736EUF#TRPBF
Description DC/DC Cntrlr Dual-OUT Step Down 850kHz 24-Pin SSOP N 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 T/R DC/DC Cntrlr Dual-OUT Step Down 850kHz 24-Pin QFN EP Tube 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 T/R
EU restricts the use of certain hazardous substances Not Compliant Compliant Not Compliant Compliant Compliant Not Compliant Compliant
ECCN (US) EAR99 EAR99 EAR99 EAR99 EAR99 EAR99 EAR99
Part Status Unconfirmed Active Unconfirmed Active Active Unconfirmed Active
Number of Outputs 2 2 2 2 2 2 2
Topology Step Down 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 0.6 to 9.8
Maximum Switching Frequency (kHz) 850 850 850 850 850 850 850
Minimum Input Voltage (V) 2.75 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 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 2.75 to 9.8
Maximum Supply Current (mA) 0.425 0.425 0.425 0.425 0.425 0.425 0.425
Minimum Switching Frequency (kHz) 250 250 250 250 250 250 250
Control Method PWM PWM PWM PWM PWM PWM PWM
Minimum Operating Temperature (°C) -40 -40 -40 -40 -40 -40 -40
Maximum Operating Temperature (°C) 85 85 85 85 85 85 85
Supplier Temperature Grade Extended Extended Extended Extended Extended Extended Extended
Pin Count 24 24 24 24 24 24 24
Standard Package Name SOP SOP SOP SOP QFN QFN QFN
Supplier Package SSOP N SSOP N SSOP N SSOP N QFN EP QFN EP QFN EP
Mounting Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount
Package Height 1.5(Max) 1.5(Max) 1.5(Max) 1.5(Max) 0.75(Max) 0.75(Max) 0.75(Max)
Package Length 8.74(Max) 8.74(Max) 8.74(Max) 8.74(Max) 4 4 4
Package Width 3.99(Max) 3.99(Max) 3.99(Max) 3.99(Max) 4 4 4
PCB changed 24 24 24 24 24 24 24
Lead Shape Gull-wing Gull-wing Gull-wing Gull-wing No Lead No Lead No Lead
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
Packaging - Tube Tape and Reel Tape and Reel Tube Tape and Reel Tape and Reel
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