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LTC3772BETS8#TRM

Description
Switching Voltage Regulators LTC3772B - Micropower No RSENSE Constant Frequency Step-Down DC/DC Controller
Categorysemiconductor    Power management   
File Size301KB,20 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Parametric Compare View All

LTC3772BETS8#TRM Overview

Switching Voltage Regulators LTC3772B - Micropower No RSENSE Constant Frequency Step-Down DC/DC Controller

LTC3772BETS8#TRM Parametric

Parameter NameAttribute value
Product AttributeAttribute Value
ManufacturerADI
Product CategorySwitching Voltage Regulators
RoHSNo -; RoHS Version Available
Mounting StyleSMD/SMT
Package / CaseSOT-8
Output Current5 A
Number of Outputs1 Output
Input Voltage MAX9.8 V
Input Voltage MIN2.75 V
Operating Supply Current0.2 mA
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

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Description Switching Voltage Regulators LTC3772B - Micropower No RSENSE Constant Frequency Step-Down DC/DC Controller Switching Voltage Regulators LTC3772B - Micropower No RSENSE Constant Frequency Step-Down DC/DC Controller Fixed Resistor, Metal Foil, 0.3W, 21ohm, 87V, 0.25% +/-Tol, -.2,.2ppm/Cel, 1206, Switching Voltage Regulators LTC3772B - Micropower No RSENSE Constant Frequency Step-Down DC/DC Controller Switching Voltage Regulators No Rsense Step-Down Controller Switching Regulator LTC3772B - Micropower No RSENSE Constant Frequency Step-Down DC/DC Controller Switching Regulator LTC3772B - Micropower No RSENSE Constant Frequency Step-Down DC/DC Controller
Product Attribute Attribute Value Attribute Value - Attribute Value Attribute Value - -
Manufacturer ADI ADI - ADI ADI - -
Product Category Switching Voltage Regulators Switching Voltage Regulators - Switching Voltage Regulators Switching Voltage Regulators switching regulator switching regulator
RoHS No -; RoHS Version Available Details - Details Details N N
Mounting Style SMD/SMT SMD/SMT - SMD/SMT SMD/SMT - -
Package / Case SOT-8 DFN-8 - SOT-8 DFN-8 - -
Output Current 5 A 5 A - 5 A 5 A - -
Number of Outputs 1 Output 1 Output - 1 Output 1 Output - -
Input Voltage MAX 9.8 V 9.8 V - 9.8 V 9.8 V - -
Input Voltage MIN 2.75 V 2.75 V - 2.75 V 2.75 V - -
Operating Supply Current 0.2 mA 0.2 mA - 0.2 mA 0.2 mA - -
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