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LTC1773EMS

Description
Synchronous Step-Down DC/DC Controller
CategoryPower/power management    The power supply circuit   
File Size269KB,20 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet Parametric Compare View All

LTC1773EMS Overview

Synchronous Step-Down DC/DC Controller

LTC1773EMS Parametric

Parameter NameAttribute value
Brand NameLinear Technology
Is it Rohs certified?incompatible
MakerLinear ( ADI )
Parts packaging codeMSOP
package instructionPLASTIC, MSOP-10
Contacts10
Manufacturer packaging codeMS
Reach Compliance Code_compli
ECCN codeEAR99
Is SamacsysN
Analog Integrated Circuits - Other TypesSWITCHING CONTROLLER
control modeCURRENT-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage8.5 V
Minimum input voltage2.65 V
Nominal input voltage5 V
JESD-30 codeS-PDSO-G10
JESD-609 codee0
length3 mm
Humidity sensitivity level1
Number of functions1
Number of terminals10
Maximum operating temperature70 °C
Minimum operating temperature
Package body materialPLASTIC/EPOXY
encapsulated codeTSSOP
Encapsulate equivalent codeTSSOP10,.19,20
Package shapeSQUARE
Package formSMALL OUTLINE, THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius)235
Certification statusNot Qualified
Maximum seat height1.1 mm
surface mountYES
Switch configurationBUCK
Maximum switching frequency600 kHz
technologyCMOS
Temperature levelCOMMERCIAL
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formGULL WING
Terminal pitch0.5 mm
Terminal locationDUAL
Maximum time at peak reflow temperature20
width3 mm
Base Number Matches1
LTC1773
Synchronous Step-Down
DC/DC Controller
FEATURES
DESCRIPTIO
High Efficiency: Up to 95%
Constant Frequency 550kHz Operation
V
IN
from 2.65V to 8.5V
V
OUT
from 0.8V to V
IN
OPTI-LOOP
®
Compensation Minimizes C
OUT
Synchronizable up to 750kHz
Selectable Burst Mode Operation
Low Quiescent Current: 80µA
µ
Low Dropout Operation: 100% Duty Cycle
Secondary Winding Regulation
Soft-Start
Current Mode Operation for Excellent Line and
Load Transient Response
Low Shutdown I
Q
= 10µA
±1.5%
Reference Accuracy
Precision 2.5V Undervoltage Lockout
Available in 10-Lead MSOP
The LTC
®
1773 is a current mode synchronous buck regu-
lator controller that drives external complementary power
MOSFETs using a fixed frequency architecture. The oper-
ating supply range is from 2.65V to 8.5V, making it
suitable for 1- or 2-cell lithium-ion battery powered appli-
cations. Burst Mode
®
operation provides high efficiency at
low load currents. 100% duty cycle provides low dropout
operation which extends operating time in battery-oper-
ated systems.
The operating frequency is internally set at 550kHz, allow-
ing the use of small surface mount inductors. For switch-
ing-noise sensitive applications, it can be synchronized up
to 750kHz. Peak current limit is user programmable with
an external high side sense resistor. A SYNC/FCB control
pin guarantees regulation of secondary windings regard-
less of load on the main output by forcing continuous
operation. Burst Mode operation is inhibited during syn-
chronization or when the SYNC/FCB pin is pulled low to
reduce noise and RF interference. Soft-start is provided by
an external capacitor.
Synchronous rectification increases efficiency and elimi-
nates the need for a Schottky diode, saving components
and board space. The LTC1773 comes in a 10-lead MSOP
package.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
OPTI-LOOP and Burst Mode are registered trademarks of Linear Technology Corporation.
Protected by U.S. Patents, including 5481178, 6580258, 6304066, 6127815.
APPLICATIO S
Cellular Telephones
RF PA Supplies
Portable Instruments
Wireless MODEMS
Distributed Power Systems
Notebook and Palm Top Computers, PDAs
Single and Dual Cell Lithium-Ion Powered Devices
TYPICAL APPLICATIO
SYNC/FCB
V
IN
2.65V TO 8.5V
100
+
V
IN
R
SENSE
0.025Ω
L1
3µH
C
IN
68µF
EFFICIENCY (%)
95
90
85
80
75
70
65
60
55
RUN/SS SENSE
0.1µF
47pF
220pF
30k
V
FB
I
TH
LTC1773
SW
GND
BG
Si9801DY
80.6k
169k
1773 F01
TG
V
OUT
2.5V
+
C
OUT
180µF
1
Figure 1. Step-Down Converter
U
High Efficiency
V
IN
= 3.3V
V
IN
= 5V
V
IN
= 8V
L = SUMIDA CDRH6D28-3R0
100
1000
10
OUTPUT CURRENT (mA)
5000
1773 F1b
U
U
1773fb
1

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