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LTC3737EUF#TR

Description
Switching Regulator LTC3737 - Dual 2-Phase, No RSENSE DC/DC Controller with Output Tracking
CategoryPower/power management    The power supply circuit   
File Size268KB,24 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Parametric Compare View All

LTC3737EUF#TR Overview

Switching Regulator LTC3737 - Dual 2-Phase, No RSENSE DC/DC Controller with Output Tracking

LTC3737EUF#TR Parametric

Parameter NameAttribute value
Is it Rohs certified?incompatible
MakerADI
package instruction4 X 4 MM, PLASTIC, QFN-24
Reach Compliance Codecompliant
ECCN codeEAR99
Analog Integrated Circuits - Other TypesDUAL SWITCHING CONTROLLER
control modeCURRENT-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage9.8 V
Minimum input voltage2.75 V
Nominal input voltage4.2 V
JESD-30 codeS-PQCC-N24
JESD-609 codee0
length4 mm
Humidity sensitivity level1
Number of functions1
Number of terminals24
Maximum operating temperature70 °C
Minimum operating temperature
Maximum output current1 A
Package body materialPLASTIC/EPOXY
encapsulated codeHVQCCN
Package shapeSQUARE
Package formCHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
Peak Reflow Temperature (Celsius)235
Certification statusNot Qualified
Maximum seat height0.8 mm
surface mountYES
Switch configurationSINGLE
Maximum switching frequency825 kHz
Temperature levelCOMMERCIAL
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formNO LEAD
Terminal pitch0.5 mm
Terminal locationQUAD
Maximum time at peak reflow temperature20
width4 mm
LTC3737
Dual 2-Phase, No R
SENSE
TM
,
DC/DC Controller with
Output Tracking
FEATURES
DESCRIPTIO
Sense Resistor Optional
Out-of-Phase Controllers Reduce Required
Input Capacitance
Programmable Output Voltage Tracking
Constant Frequency Current Mode Architecture
Wide V
IN
Range: 2.75V to 9.8V
Wide V
OUT
Range: 0.6V to V
IN
0.6V
±1.5%
Reference
Low Dropout Operation: 100% Duty Cycle
True PLL for Frequency Locking or Adjustment
(Frequency Range 250kHz to 850kHz)
Selectable Burst Mode
®
or Pulse Skipping Operation
at Light Loads
Internal Soft-Start Circuitry
Selectable Maximum Peak Current Sense Threshold
Power Good Output Voltage Monitor
Output Overvoltage Protection
Micropower Shutdown: I
Q
= 9µA
Tiny 4mm
×
4mm QFN and 24-Lead SSOP Packages
The LTC
®
3737 is a 2-phase dual step-down switching
regulator controller that requires few external compo-
nents. The constant frequency current mode architecture
provides excellent AC and DC load and line regulation.
MOSFET V
DS
sensing eliminates the need for current
sense resistors and improves efficiency. Power loss and
noise due to the ESR of the input capacitance are mini-
mized by operating the two controllers out of phase.
Burst Mode operation provides high efficiency operation
at light loads. 100% duty cycle provides low dropout
operation and extends battery operating time.
Switching frequency can be programmed up to 750kHz,
allowing the use of small surface mount inductors and
capacitors. For noise sensitive applications, the LTC3737
can be externally synchronized from 250kHz to 850kHz.
Other features include a power good output voltage moni-
tor, a tracking input and internal soft-start.
The LTC3737 is available in the low profile thermally
enhanced (4mm
×
4mm) QFN package or a 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, 5731694, 5929620, 6144194,
6580258, 5994885
APPLICATIO S
One or Two Lithium-Ion Powered Devices
Notebook and Palmtop Computers, PDAs
Portable Instruments
Distributed DC Power Systems
TYPICAL APPLICATIO
187k
SW1
59k
15k
V
FB1
I
TH1
220pF
220pF
59k
118k
SENSE1
+
PV
IN1
PGATE1
M1
2.2µH
V
IN
2.75V TO
9.8V
Efficiency and Power Loss vs Load Current
100
95
90
V
OUT
= 2.5V
EFFICIENCY
1000
10000
+
D1
47µF
V
OUT1
2.5V
EFFICIENCY (%)
PGOOD
V
IN
LTC3737
SGND
PGND
TRACK
I
TH2
V
FB2
SW2
RUN/SS
PV
IN2
SENSE2
+
M2
3737 F01
10µF
×2
15k
2.2µH
Figure 1. High Efficiency, 2-Phase, 550kHz Dual Step-Down Converter
+
PGATE2
D2
47µF
V
OUT2
1.8V
U
POWER LOSS (mW)
85
80
75
70
65
60
1
V
IN
= 3.3V
100
1000
10
LOAD CURRENT (mA)
1
10000
TYPICAL POWER LOSS
(V
OUT
= 2.5V)
10
V
OUT
= 1.8V
100
3737 F01b
U
U
3737fa
1

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Is it Rohs certified? incompatible incompatible incompatible conform to incompatible
Maker ADI ADI ADI ADI ADI
package instruction 4 X 4 MM, PLASTIC, QFN-24 0.150 INCH, PLASTIC, SSOP-24 HVQCCN, SSOP, 0.150 INCH, PLASTIC, SSOP-24
Reach Compliance Code compliant not_compliant not_compliant compliant not_compliant
ECCN code EAR99 EAR99 EAR99 - EAR99
Analog Integrated Circuits - Other Types DUAL SWITCHING CONTROLLER DUAL SWITCHING CONTROLLER - DUAL SWITCHING CONTROLLER DUAL SWITCHING CONTROLLER
control mode CURRENT-MODE CURRENT-MODE - CURRENT-MODE CURRENT-MODE
Control Technology PULSE WIDTH MODULATION PULSE WIDTH MODULATION - PULSE WIDTH MODULATION PULSE WIDTH MODULATION
Maximum input voltage 9.8 V 9.8 V - 9.8 V 9.8 V
Minimum input voltage 2.75 V 2.75 V - 2.75 V 2.75 V
Nominal input voltage 4.2 V 4.2 V - 4.2 V 4.2 V
JESD-30 code S-PQCC-N24 R-PDSO-G24 - R-PDSO-G24 R-PDSO-G24
JESD-609 code e0 e0 - e3 e0
length 4 mm 8.649 mm - 8.649 mm 8.649 mm
Humidity sensitivity level 1 1 - 1 1
Number of functions 1 1 - 1 1
Number of terminals 24 24 - 24 24
Maximum operating temperature 70 °C 70 °C - 70 °C 70 °C
Maximum output current 1 A 1 A - 1 A 1 A
Package body material PLASTIC/EPOXY PLASTIC/EPOXY - PLASTIC/EPOXY PLASTIC/EPOXY
encapsulated code HVQCCN SSOP - SSOP SSOP
Package shape SQUARE RECTANGULAR - RECTANGULAR RECTANGULAR
Package form CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE SMALL OUTLINE, SHRINK PITCH - SMALL OUTLINE, SHRINK PITCH SMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius) 235 235 - 260 235
Certification status Not Qualified Not Qualified - Not Qualified Not Qualified
Maximum seat height 0.8 mm 1.75 mm - 1.75 mm 1.75 mm
surface mount YES YES - YES YES
Switch configuration SINGLE SINGLE - SINGLE SINGLE
Maximum switching frequency 825 kHz 825 kHz - 825 kHz 825 kHz
Temperature level COMMERCIAL COMMERCIAL - COMMERCIAL COMMERCIAL
Terminal surface Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) - Matte Tin (Sn) Tin/Lead (Sn/Pb)
Terminal form NO LEAD GULL WING - GULL WING GULL WING
Terminal pitch 0.5 mm 0.635 mm - 0.635 mm 0.635 mm
Terminal location QUAD DUAL - DUAL DUAL
Maximum time at peak reflow temperature 20 20 - 30 20
width 4 mm 3.899 mm - 3.899 mm 3.899 mm
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