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LTC1771I

Description
1 A SWITCHING CONTROLLER, PDSO8
Categorysemiconductor    Analog mixed-signal IC   
File Size210KB,16 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet Parametric Compare View All

LTC1771I Overview

1 A SWITCHING CONTROLLER, PDSO8

LTC1771I Parametric

Parameter NameAttribute value
Rated input voltage10 V
Number of functions1
Number of terminals8
Minimum operating temperature-40 Cel
Maximum operating temperature85 Cel
Processing package description0.150 INCH, PLASTIC, SOP-8
each_compliYes
stateActive
Analog IC other typesSWITCHING CONTROLLER
control modeCURRENT-MODE
Control TechnologyCONSTANT OFF TIME
Minimum input voltage2.8 V
Maximum input voltage20 V
jesd_30_codeR-PDSO-G8
jesd_609_codee0
moisture_sensitivity_level1
Maximum output current1 A
Packaging MaterialsPLASTIC/EPOXY
ckage_codeSOP
ckage_equivalence_codeSOP8,.25
packaging shapeRECTANGULAR
Package SizeSMALL OUTLINE
eak_reflow_temperature__cel_235
qualification_statusCOMMERCIAL
seated_height_max1.75 mm
sub_categorySwitching Regulator or Controllers
surface mountYES
Switch configurationSINGLE
CraftsmanshipCMOS
Temperature levelINDUSTRIAL
terminal coatingTIN LEAD
Terminal formGULL WING
Terminal spacing1.27 mm
Terminal locationDUAL
ime_peak_reflow_temperature_max__s_20
length4.9 mm
width3.9 mm
dditional_featureALSO OPERATES IN ADJUSTABLE MODE FROM 1.23V TO 18V
Final Electrical Specifications
LTC1771
Low Quiescent Current
High Efficiency Step-Down
DC/DC Controller
FEATURES
s
s
s
s
s
s
s
s
s
DESCRIPTIO
February 2000
s
s
s
s
Very Low Standby Current: 10µA
Available in Space-Saving 8-Lead MSOP Package
High Output Currents
Wide V
IN
Range: 2.8V to 20V Operation
V
OUT
Range: 1.23V to 18V
High Efficiency: Over 93% Possible
±2%
Output Accuracy
Very Low Dropout Operation: 100% Duty Cycle
Current Mode Operation for Excellent Line and
Load Transient Response
Defeatable Burst Mode
TM
Operation
Short-Circuit Protected
Optional Programmable Soft-Start
Micropower Shutdown: I
Q
= 2µA
The LTC
®
1771 is a high efficiency current mode step-
down DC/DC controller that draws as little as 10µA DC
supply current to regulate the output at no load while
maintaining high efficiency for loads up to several amps.
The LTC1771 drives an external P-channel power MOSFET
using a current mode, constant off-time architecture. An
external sense resistor is used to program the operating
current level. Current mode control provides short-circuit
protection, excellent transient response and controlled
start-up behavior. Burst Mode operation enables the
LTC1771 to maintain high efficiency down to extremely
low currents. Shutdown mode further reduces the supply
current to a mere 2µA. For low noise applications, Burst
Mode operation can be easily disabled with the MODE pin.
Wide input supply range of 2.8V to 18V (20V maximum)
and 100% duty cycle operation for low dropout make the
LTC1771 ideal for a wide variety of battery-powered appli-
cations where maximizing battery life is important.
The LTC1771’s availability in both 8-lead MSOP and SO
packages provides for a minimum area solution.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
APPLICATIO S
s
s
s
s
s
s
Cellular Telephones and Wireless Modems
1- to 4-Cell Lithium-Ion-Powered Applications
Portable Instruments
Battery-Powered Equipment
Battery Chargers
Scanners
TYPICAL APPLICATIO
V
IN
4.5V TO 18V
R
SENSE
0.05Ω
V
IN
RUN/SS
C
SS
0.01µF
R
C
10k
C
C
22OpF
SENSE
PGATE
M1
Si6447DQ
10µF
25V
CER
100
V
IN
= 5V
90
EFFICIENCY (%)
I
TH
LTC1771
V
FB
MODE
GND
V
IN
R2
1.64M
1%
L1
15µH
UPS5817
80
70
60
50
40
0.1
V
OUT
= 3.3V
R
SENSE
= 0.05Ω
1
+
C
OUT
150µF
6.3V
V
OUT
3.3V
2A
R1
1M
1%
5pF
1771 F01
Figure 1. High Efficiency Step-Down Converter
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
U
U
U
LTC1771 Efficiency
V
IN
= 10V
V
IN
= 15V
10
100
1000
LOAD CURRENT (mA)
10000
1771 F01b
1

LTC1771I Related Products

LTC1771I LTC1771EMS8 LTC1771E
Description 1 A SWITCHING CONTROLLER, PDSO8 1 A SWITCHING CONTROLLER, PDSO8 1 A SWITCHING CONTROLLER, PDSO8
Number of functions 1 1 1
Number of terminals 8 8 8
Minimum operating temperature -40 Cel - -40 Cel
Maximum operating temperature 85 Cel 70 °C 85 Cel
control mode CURRENT-MODE CURRENT-MODE CURRENT-MODE
Control Technology CONSTANT OFF TIME CONSTANT OFF TIME CONSTANT OFF TIME
Minimum input voltage 2.8 V 2.8 V 2.8 V
Maximum input voltage 20 V 20 V 20 V
Maximum output current 1 A 1 A 1 A
surface mount YES YES YES
Switch configuration SINGLE SINGLE SINGLE
Temperature level INDUSTRIAL COMMERCIAL INDUSTRIAL
Terminal form GULL WING GULL WING GULL WING
Terminal location DUAL DUAL DUAL
length 4.9 mm 3 mm 4.9 mm
width 3.9 mm 3 mm 3.9 mm
Rated input voltage 10 V - 10 V
Processing package description 0.150 INCH, PLASTIC, SOP-8 - 0.150 INCH, PLASTIC, SOP-8
each_compli Yes - Yes
state Active - Active
Analog IC other types SWITCHING CONTROLLER - SWITCHING CONTROLLER
jesd_30_code R-PDSO-G8 - R-PDSO-G8
jesd_609_code e0 - e0
moisture_sensitivity_level 1 - 1
Packaging Materials PLASTIC/EPOXY - PLASTIC/EPOXY
ckage_code SOP - SOP
ckage_equivalence_code SOP8,.25 - SOP8,.25
packaging shape RECTANGULAR - RECTANGULAR
Package Size SMALL OUTLINE - SMALL OUTLINE
eak_reflow_temperature__cel_ 235 - 235
qualification_status COMMERCIAL - COMMERCIAL
seated_height_max 1.75 mm - 1.75 mm
sub_category Switching Regulator or Controllers - Switching Regulator or Controllers
Craftsmanship CMOS - CMOS
terminal coating TIN LEAD - TIN LEAD
Terminal spacing 1.27 mm - 1.27 mm
ime_peak_reflow_temperature_max__s_ 20 - 20
dditional_feature ALSO OPERATES IN ADJUSTABLE MODE FROM 1.23V TO 18V - ALSO OPERATES IN ADJUSTABLE MODE FROM 1.23V TO 18V
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