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LTC3772ETS8#PBF

Description
DC/DC Cntrlr Single-OUT Step Down 650kHz 8-Pin TSOT-23 T/R
File Size215KB,20 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Parametric Compare View All

LTC3772ETS8#PBF Overview

DC/DC Cntrlr Single-OUT Step Down 650kHz 8-Pin TSOT-23 T/R

LTC3772ETS8#PBF Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesCompliant
ECCN (US)0
Part StatusUnconfirmed
HTS8542.39.00.01
Number of Outputs1
TopologyStep Down
Output Voltage (V)0.8 to 9.8
Maximum Switching Frequency (kHz)650
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)0.375
Minimum Operating Temperature (°C)-40
Maximum Operating Temperature (°C)85
Supplier Temperature GradeExtended
PackagingTape and Reel
Pin Count8
Standard Package NameSOT-23
Supplier PackageTSOT-23
MountingSurface Mount
Package Height0.9(Max)
Package Length2.9
Package Width1.75(Max)
PCB changed8
Lead ShapeGull-wing
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

LTC3772ETS8#PBF Related Products

LTC3772ETS8#PBF LTC3772EDDB#PBF LTC3772EDDB#TRMPBF LTC3772EDDB#TRPBF LTC3772ETS8#TRMPBF
Description DC/DC Cntrlr Single-OUT Step Down 650kHz 8-Pin TSOT-23 T/R DC/DC Cntrlr Single-OUT Step Down 650kHz 8-Pin DFN EP T/R DC/DC Cntrlr Single-OUT Step Down 650kHz 8-Pin DFN EP T/R DC/DC Cntrlr Single-OUT Step Down 650kHz 8-Pin DFN EP T/R DC/DC Cntrlr Single-OUT Step Down 650kHz 8-Pin TSOT-23 T/R
EU restricts the use of certain hazardous substances Compliant Compliant Compliant Compliant Compliant
ECCN (US) - EAR99 EAR99 EAR99 EAR99
Part Status Unconfirmed Unconfirmed Active Active Active
Number of Outputs 1 1 1 1 1
Topology Step Down Step Down Step Down Step Down Step Down
Output Voltage (V) 0.8 to 9.8 0.8 to 9.8 0.8 to 9.8 0.8 to 9.8 0.8 to 9.8
Maximum Switching Frequency (kHz) 650 650 650 650 650
Minimum Input Voltage (V) 2.75 2.75 2.75 2.75 2.75
Maximum Input Voltage (V) 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
Maximum Supply Current (mA) 0.375 0.375 0.375 0.375 0.375
Minimum Operating Temperature (°C) -40 -40 -40 -40 -40
Maximum Operating Temperature (°C) 85 85 85 85 85
Supplier Temperature Grade Extended Extended Extended Extended Extended
Packaging Tape and Reel Tape and Reel Tape and Reel Tape and Reel Tape and Reel
Pin Count 8 8 8 8 8
Standard Package Name SOT-23 DFN DFN DFN SOT-23
Supplier Package TSOT-23 DFN EP DFN EP DFN EP TSOT-23
Mounting Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount
Package Height 0.9(Max) 0.75(Max) 0.75(Max) 0.75(Max) 0.9(Max)
Package Length 2.9 3 3 3 2.9
Package Width 1.75(Max) 2 2 2 1.75(Max)
PCB changed 8 8 8 8 8
Lead Shape Gull-wing No Lead No Lead No Lead Gull-wing
HTS 8542.39.00.01 - 8542.39.00.01 - 8542.39.00.01
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