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LTC3772EDDB

Description
Micropower No RSENSE Constant Frequency Step-Down DC/DC Controller
CategoryPower/power management    The power supply circuit   
File Size250KB,20 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet Parametric Compare View All

LTC3772EDDB Overview

Micropower No RSENSE Constant Frequency Step-Down DC/DC Controller

LTC3772EDDB Parametric

Parameter NameAttribute value
Brand NameLinear Technology
Is it Rohs certified?incompatible
MakerLinear ( ADI )
Parts packaging codeDFN
package instructionHVSSON, SOLCC8,.08,20
Contacts8
Manufacturer packaging codeDDB
Reach Compliance Code_compli
ECCN codeEAR99
Analog Integrated Circuits - Other TypesSWITCHING CONTROLLER
control modeCURRENT-MODE
Maximum input voltage9.8 V
Minimum input voltage2.75 V
Nominal input voltage4.2 V
JESD-30 codeR-PDSO-N8
JESD-609 codee0
length3 mm
Humidity sensitivity level1
Number of functions1
Number of terminals8
Maximum operating temperature70 °C
Minimum operating temperature
Maximum output current1 A
Package body materialPLASTIC/EPOXY
encapsulated codeHVSSON
Encapsulate equivalent codeSOLCC8,.08,20
Package shapeRECTANGULAR
Package formSMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius)235
Certification statusNot Qualified
Maximum seat height0.8 mm
surface mountYES
Switch configurationSINGLE
Maximum switching frequency650 kHz
technologyCMOS
Temperature levelCOMMERCIAL
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formNO LEAD
Terminal pitch0.5 mm
Terminal locationDUAL
Maximum time at peak reflow temperature20
width2 mm
LTC3772
Micropower No R
SENSE
Constant Frequency Step-Down
DC/DC Controller
FEATURES
DESCRIPTIO
No Current Sense Resistor Required
40µA No-Load Quiescent Current
High Output Currents Easily Achieved
Internal Soft-Start Ramps V
OUT
Wide V
IN
Range: 2.75V to 9.8V
Low Dropout: 100% Duty Cycle
Constant Frequency 550kHz Operation
Low Ripple Burst Mode
®
Operation at Light Load
Output Voltage as Low as 0.8V
±1.5%
Voltage Reference Accuracy
Current Mode Operation for Excellent Line and Load
Transient Response
Only 8µA Supply Current in Shutdown
Low Profile 8-Lead SOT-23 (1mm) and
(3mm
×
2mm) DFN (0.75mm) Packages
The LTC
®
3772 is a constant frequency current mode
step-down DC/DC controller in a low profile 8-lead SOT-23
(ThinSOT
TM
) and a 3mm
×
2mm DFN package. The No
R
SENSE
TM
architecture eliminates the need for a current
sense resistor, improving efficiency and saving board
space.
The LTC3772 automatically switches into Burst Mode
operation at light loads to increase efficiency at low output
current. It consumes only 40µA of quiescent current
under a no-load condition.
The LTC3772 incorporates an undervoltage lockout fea-
ture that shuts down the device when the input voltage
falls below 2V. To maximize the runtime from a battery
source, the external P-channel MOSFET is turned on
continuously in dropout (100% duty cycle). High switch-
ing frequency of 550kHz allows the use of a small inductor
and capacitors. An internal soft-start smoothly ramps the
output voltage from zero to its regulation point.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
ThinSOT and No R
SENSE
are trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
APPLICATIO S
1- or 2-Cell Li-Ion Battery-Powered Applications
Wireless Devices
Portable Computers
Distributed Power Systems
TYPICAL APPLICATIO
680pF
20k
I
TH
/RUN
LTC3772
GND
82.5k
V
FB
SW
PGATE
V
IN
550kHz Micropower Step-Down DC/DC Converter
V
IN
2.75V TO 9.8V
10µF
Efficiency and Power Loss vs Load Current
100
V
IN
= 3.3V
90
V
IN
= 5V
EFFICIENCY (%)
80
70
60
0.01
50
40
1
FIGURE 5 CIRCUIT
100
1000
10
LOAD CURRENT (mA)
0.1
V
IN
= 5V
V
IN
= 3.3V
3.3µH
47µF
V
OUT
2.5V
2A
22pF
174k
3772 TA01
U
10
1
POWER LOSS (W)
U
U
0.001
10000
3772 TA01b
3772f
1

LTC3772EDDB Related Products

LTC3772EDDB LTC3772 LTC3772ETS8
Description Micropower No RSENSE Constant Frequency Step-Down DC/DC Controller Micropower No RSENSE Constant Frequency Step-Down DC/DC Controller Micropower No RSENSE Constant Frequency Step-Down DC/DC Controller
Brand Name Linear Technology - Linear Technology
Is it Rohs certified? incompatible - incompatible
Maker Linear ( ADI ) - Linear ( ADI )
Parts packaging code DFN - SOT
package instruction HVSSON, SOLCC8,.08,20 - VSSOP, TSSOP8,.1
Contacts 8 - 8
Manufacturer packaging code DDB - TS8
Reach Compliance Code _compli - _compli
ECCN code EAR99 - EAR99
Analog Integrated Circuits - Other Types SWITCHING CONTROLLER - SWITCHING CONTROLLER
control mode CURRENT-MODE - CURRENT-MODE
Maximum input voltage 9.8 V - 9.8 V
Minimum input voltage 2.75 V - 2.75 V
Nominal input voltage 4.2 V - 4.2 V
JESD-30 code R-PDSO-N8 - R-PDSO-G8
JESD-609 code e0 - e0
length 3 mm - 2.9 mm
Humidity sensitivity level 1 - 1
Number of functions 1 - 1
Number of terminals 8 - 8
Maximum operating temperature 70 °C - 70 °C
Maximum output current 1 A - 1 A
Package body material PLASTIC/EPOXY - PLASTIC/EPOXY
encapsulated code HVSSON - VSSOP
Encapsulate equivalent code SOLCC8,.08,20 - TSSOP8,.1
Package shape RECTANGULAR - RECTANGULAR
Package form SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE, SHRINK PITCH - SMALL OUTLINE, VERY THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius) 235 - 235
Certification status Not Qualified - Not Qualified
Maximum seat height 0.8 mm - 1 mm
surface mount YES - YES
Switch configuration SINGLE - SINGLE
Maximum switching frequency 650 kHz - 650 kHz
technology CMOS - CMOS
Temperature level COMMERCIAL - COMMERCIAL
Terminal surface Tin/Lead (Sn/Pb) - Tin/Lead (Sn/Pb)
Terminal form NO LEAD - GULL WING
Terminal pitch 0.5 mm - 0.65 mm
Terminal location DUAL - DUAL
Maximum time at peak reflow temperature 20 - 20
width 2 mm - 1.625 mm
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