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LTC1779ES6#TRMPBF

Description
Conv DC-DC 2.5V to 9.8V Step Down Single-Out 0.8V to 9.8V 0.25A 6-Pin TSOT-23 T/R
File Size174KB,12 Pages
ManufacturerADI
Websitehttps://www.analog.com
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LTC1779ES6#TRMPBF Overview

Conv DC-DC 2.5V to 9.8V Step Down Single-Out 0.8V to 9.8V 0.25A 6-Pin TSOT-23 T/R

LTC1779ES6#TRMPBF Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesCompliant
ECCN (US)EAR99
Part StatusActive
HTS8542.39.00.01
TypeStep Down
Output TypeAdjustable
Switching Frequency (kHz)650
Switching RegulatorYes
Number of Outputs1
Output Voltage (V)0.8 to 9.8
Maximum Output Current (A)0.25
Minimum Input Voltage (V)2.5
Maximum Input Voltage (V)9.8
Operating Supply Voltage (V)2.5 to 9.8
Typical Quiescent Current (uA)135
Line Regulation3mV/V
Load Regulation2.5mV/uA(Typ)
Efficiency (%)94
Minimum Operating Temperature (°C)-40
Maximum Operating Temperature (°C)85
Supplier Temperature GradeExtended
PackagingTape and Reel
Pin Count6
Standard Package NameSOT
Supplier PackageTSOT-23
MountingSurface Mount
Package Height0.9(Max)
Package Length2.9
Package Width1.75(Max)
PCB changed6
Lead ShapeGull-wing
LTC1779
250mA Current Mode
Step-Down DC/DC Converter
in ThinSOT
FEATURES
s
s
s
s
s
s
s
s
s
DESCRIPTIO
s
s
s
High Efficiency: Up to 94%
250mA Output Current
Wide V
IN
Range: 2.5V to 9.8V
550kHz Constant Frequency Operation
Burst Mode
TM
Operation at Light Load
Low Dropout: 100% Duty Cycle
0.8V Reference Allows Low Output Voltages
±2.5%
Reference Accuracy
Current Mode Operation for Excellent Line and Load
Transient Response
Low Quiescent Current: 135µA
Shutdown Mode Draws Only 8µA Supply Current
Low Profile (1mm) ThinSOT
TM
Package
The LTC
®
1779 is a constant frequency current mode step-
down DC/DC converter in a 6-lead ThinSOT package. The
part operates with a 2.5V to 9.8V input and can provide up
to 250mA of output current. Current mode control pro-
vides excellent AC and DC load and line regulation. The
device incorporates an accurate undervoltage lockout fea-
ture that shuts down the LTC1779 when the input voltage
falls below 2V.
The LTC1779 boasts a
±2.5%
output voltage accuracy and
consumes only 135µA of quiescent current. For applica-
tions where efficiency is a prime consideration, the LTC1779
is configured for Burst Mode operation, which enhances
efficiency at low output current.
To further maximize the life of a battery source, the
internal P-channel MOSFET is turned on continuously in
dropout (100% duty cycle). In shutdown, the device draws
a mere 8µA. High constant operating frequency of 550kHz
allows the use of a small external inductor.
The LTC1779 is available in a low profile (1mm) ThinSOT
package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode and ThinSOT are trademarks of Linear Technology Corporation.
APPLICATIO S
s
s
s
s
s
s
1- or 2-Cell Lithium-Ion-Powered Applications
Cellular Telephones
Wireless Modems
Portable Computers
Distributed 3.3V, 2.5V or 1.8V Power Systems
Scanners
TYPICAL APPLICATIO
C3
0.1µF
1
20k
100pF
3
V
FB
SENSE
4
I
TH
/RUN
LTC1779
GND
V
IN
SW
6
D1
R1
10Ω
L1
22µH
C1
10µF
16V
V
IN
2.5V
TO 9.8V
V
OUT
2.5V
100mA
100
90
V
IN
= 3.3V
80
EFFICIENCY (%)
+
5
2
C2
47µF
6V
169k
70
V
IN
= 9.8V
60
50
40
30
0.1
V
OUT
= 2.5V
R
SENSE
= 10Ω
1
10
100
LOAD CURRENT (mA)
1000
1779 F01b
78.7k
1779 F01a
C1: TAIYO YUDEN CERAMIC EMK325BJ106MNT
C2: SANYO POSCAP 6TPA47M
D1: IR10BQ015
L1: COILTRONICS UP1B220
Figure 1. LTC1779 High Efficiency 2.5V/100mA Step-Down Converter
U
Efficiency vs Load Current
V
IN
= 6V
U
U
1

LTC1779ES6#TRMPBF Related Products

LTC1779ES6#TRMPBF LTC1779ES6
Description Conv DC-DC 2.5V to 9.8V Step Down Single-Out 0.8V to 9.8V 0.25A 6-Pin TSOT-23 T/R Conv DC-DC 2.5V to 9.8V Step Down Single-Out 0.8V to 9.8V 0.25A 6-Pin TSOT-23
EU restricts the use of certain hazardous substances Compliant Not Compliant
ECCN (US) EAR99 EAR99
Part Status Active Unconfirmed
HTS 8542.39.00.01 8542.39.00.01
Type Step Down Step Down
Output Type Adjustable Adjustable
Switching Frequency (kHz) 650 650
Switching Regulator Yes Yes
Number of Outputs 1 1
Output Voltage (V) 0.8 to 9.8 0.8 to 9.8
Maximum Output Current (A) 0.25 0.25
Minimum Input Voltage (V) 2.5 2.5
Maximum Input Voltage (V) 9.8 9.8
Operating Supply Voltage (V) 2.5 to 9.8 2.5 to 9.8
Typical Quiescent Current (uA) 135 135
Line Regulation 3mV/V 3mV/V
Load Regulation 2.5mV/uA(Typ) 2.5mV/uA(Typ)
Efficiency (%) 94 94
Minimum Operating Temperature (°C) -40 -40
Maximum Operating Temperature (°C) 85 85
Supplier Temperature Grade Extended Extended
Pin Count 6 6
Standard Package Name SOT SOT-23
Supplier Package TSOT-23 TSOT-23
Mounting Surface Mount Surface Mount
Package Height 0.9(Max) 0.9(Max)
Package Length 2.9 2.9
Package Width 1.75(Max) 1.75(Max)
PCB changed 6 6
Lead Shape Gull-wing Gull-wing
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