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LTC3772BETS8#TRPBF

Description
IC REG CTRLR BUCK TSOT23-8
Categorysemiconductor    Power management   
File Size301KB,20 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Environmental Compliance
Download Datasheet Parametric Compare View All

LTC3772BETS8#TRPBF Overview

IC REG CTRLR BUCK TSOT23-8

LTC3772BETS8#TRPBF Parametric

Parameter NameAttribute value
Output typetransistor driver
Functionstep down
Output configurationjust
Topologystep down
Number of outputs1
output stage1
Voltage - Power Supply (Vcc/Vdd)2.75 V ~ 9.8 V
Frequency - Switch200kHz ~ 550kHz
Duty cycle (maximum)1
Synchronous rectifiernone
Clock synchronizationnone
serial interface-
Control characteristicscurrent limit, enable
Operating temperature-40°C ~ 85°C(TA)
Package/casingSOT-23-8 thin, TSOT-23-8
Supplier device packagingTSOT-23-8
LTC3772B
Micropower No R
SENSE
Constant Frequency Step-Down
DC/DC Controller
FEATURES
DESCRIPTIO
No Current Sense Resistor Required
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 Pulse Skipping 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
®
3772B 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 LTC3772B automatically switches into pulse skipping
operation at light loads. It consumes only 200µA of quies-
cent current under a no-load condition.
The LTC3772B 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.
, LT, LTC and LTM are registered trademarks 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. Protected by
U.S. Patents including 5731694, 6127815.
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
GND
82.5k
V
FB
SW
V
IN
LTC3772B
PGATE
550kHz Micropower Step-Down DC/DC Converter
V
IN
2.75V TO 9.8V
10µF
Efficiency and Power Loss vs Load Current
(Figure 5 Circuit)
100
90
80
70
EFFICIENCY
1
10
EFFICIENCY (%)
3.3µH
47µF
V
OUT
2.5V
2A
60
50
40
30
POWER LOSS
0.01
V
IN
= 3.3V
V
IN
= 5V
1
10
100
1000
LOAD CURRENT (mA)
0.1
22pF
174k
3772B TA01
20
10
0
U
0.001
10000
U
U
POWER LOSS (W)
3772B TA01b
3772bfa
1

LTC3772BETS8#TRPBF Related Products

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Description IC REG CTRLR BUCK TSOT23-8 IC REG CTRLR BUCK TSOT23-8 IC REG CTRLR BUCK 8DFN IC REG CTRLR BUCK 8DFN
Output type transistor driver transistor driver transistor driver -
Function step down step down step down -
Output configuration just just just -
Topology step down step down step down -
Number of outputs 1 1 1 -
output stage 1 1 1 -
Voltage - Power Supply (Vcc/Vdd) 2.75 V ~ 9.8 V 2.75 V ~ 9.8 V 2.75 V ~ 9.8 V -
Frequency - Switch 200kHz ~ 550kHz 200kHz ~ 550kHz 200kHz ~ 550kHz -
Duty cycle (maximum) 1 1 1 -
Synchronous rectifier none none none -
Clock synchronization none none none -
Control characteristics current limit, enable current limit, enable current limit, enable -
Operating temperature -40°C ~ 85°C(TA) -40°C ~ 85°C(TA) -40°C ~ 85°C(TA) -
Package/casing SOT-23-8 thin, TSOT-23-8 SOT-23-8 thin, TSOT-23-8 8-WFDFN Exposed Pad -
Supplier device packaging TSOT-23-8 TSOT-23-8 8-DFN(3x2) -
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