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LTC1622CMS8

Description
1 A SWITCHING CONTROLLER, 625 kHz SWITCHING FREQ-MAX, PDSO8
CategoryPower/power management    The power supply circuit   
File Size186KB,16 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Related ProductsFound1parts with similar functions to LTC1622CMS8
Download Datasheet Parametric Compare View All

LTC1622CMS8 Overview

1 A SWITCHING CONTROLLER, 625 kHz SWITCHING FREQ-MAX, PDSO8

LTC1622CMS8 Parametric

Parameter NameAttribute value
Brand NameLinear Technology
Is it Rohs certified?incompatible
MakerLinear ( ADI )
Parts packaging codeMSOP
package instructionTSSOP, TSSOP8,.19
Contacts8
Manufacturer packaging codeMS8
Reach Compliance Codenot_compliant
ECCN codeEAR99
Analog Integrated Circuits - Other TypesSWITCHING CONTROLLER
control modeCURRENT-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage10 V
Minimum input voltage2 V
Nominal input voltage4.2 V
JESD-30 codeS-PDSO-G8
JESD-609 codee0
length3 mm
Humidity sensitivity level1
Number of functions1
Number of terminals8
Maximum operating temperature70 °C
Minimum operating temperature
Maximum output current1 A
Package body materialPLASTIC/EPOXY
encapsulated codeTSSOP
Encapsulate equivalent codeTSSOP8,.19
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 configurationSINGLE
Maximum switching frequency625 kHz
technologyCMOS
Temperature levelCOMMERCIAL
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formGULL WING
Terminal pitch0.65 mm
Terminal locationDUAL
Maximum time at peak reflow temperature20
width3 mm
Base Number Matches1
LTC1622
Low Input Voltage
Current Mode Step-Down
DC/DC Controller
FEATURES
s
s
s
s
s
s
s
s
s
DESCRIPTIO
s
s
s
s
High Efficiency
Constant Frequency 550kHz Operation
V
IN
Range: 2V to 10V
Multiampere Output Currents
OPTI-LOOP
TM
Compensation Minimizes C
OUT
Selectable, Burst Mode Operation
Low Dropout Operation: 100% Duty Cycle
Synchronizable up to 750kHz
Current Mode Operation for Excellent Line and Load
Transient Response
Low Quiescent Current: 350µA
Shutdown Mode Draws Only 15µA Supply Current
±1.9%
Reference Accuracy
Available in 8-Lead MSOP
APPLICATIO S
s
s
s
s
s
s
s
1- or 2-Cell Li-Ion Powered Applications
Cellular Telephones
Wireless Modems
Portable Computers
Distributed 3.3V, 2.5V or 1.8V Power Systems
Scanners
Battery-Powered Equipment
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode and OPTI-LOOP are a trademarks of Linear Technology Corporation.
The LTC
®
1622 is a constant frequency current mode step-
down DC/DC controller providing excellent AC and DC load
and line regulation. The device incorporates an accurate
undervoltage feature that shuts the LTC1622 down when
the input voltage falls below 2V.
The LTC1622 boasts a
±1.9%
output voltage accuracy and
consumes only 350µA of quiescent current. For applica-
tions where efficiency is a prime consideration and the
load current varies from light to heavy, the LTC1622 can
be configured for Burst Mode
TM
operation. Burst Mode
operation enhances low current efficiency and extends
battery run time. Burst Mode operation is inhibited during
synchronization or when the SYNC/MODE pin is pulled low
to reduce noise and possible RF interference.
High constant operating frequency of 550kHz allows the
use of a small inductor. The device can also be synchro-
nized up to 750kHz for special applications. The high
frequency operation and the available 8-lead MSOP pack-
age create a high performance solution in an extremely
small amount of PCB area.
To further maximize the life of the battery source, the
P-channel MOSFET is turned on continuously in dropout
(100% duty cycle). In shutdown, the device draws a mere
15µA.
TYPICAL APPLICATIO
8
2
R1
10k
C3
220pF
4
470pF
V
IN
I
TH
SENSE
1
V
IN
2.5V TO 8.5V
R2
0.03Ω
Si3443DV L1
4.7µH
D1
IR10BQ015
R3
159k
R4
75k
L1: MURATA LQN6C-4R7
R2: DALE WSL-1206 0-03Ω
C1
10µF
10V
Efficiency vs Load Current with
Burst Mode Operation Enabled
100
V
IN
= 4.2V
90
EFFICIENCY (%)
V
IN
= 3.3V
7
PDRV
LTC1622
5
SYNC/MODE
6
80
V
IN
= 6V
70
60
50
V
OUT
= 2.5V
R
SENSE
= 0.03Ω
1
100
1000
10
LOAD CURRENT (mA)
5000
1622 F01b
V
OUT
2.5V
1.5A
RUN/SS
GND
V
FB
3
+
C2
47µF
6V
C1: TAIYO YUDEN CERAMIC EMK325BJ106MNT
C2: SANYO POSCAP 6TPA47M
D1: INTERNATIONAL RECTIFIER IR10BQ015
1622 F01a
40
Figure 1. High Efficiency Step-Down Converter
U
V
IN
= 8.4V
U
U
1

LTC1622CMS8 Related Products

LTC1622CMS8 LTC1622CS8 LTC1622
Description 1 A SWITCHING CONTROLLER, 625 kHz SWITCHING FREQ-MAX, PDSO8 1 A SWITCHING CONTROLLER, 625 kHz SWITCHING FREQ-MAX, PDSO8 1 A SWITCHING CONTROLLER, 625 kHz SWITCHING FREQ-MAX, PDSO8
control mode CURRENT-MODE CURRENT-MODE PEAK CURRENT
Number of functions 1 1 1
Number of terminals 8 8 8
Maximum operating temperature 70 °C 70 °C 70 Cel
Maximum output current 1 A 1 A 1 A
surface mount YES YES Yes
Switch configuration SINGLE SINGLE SINGLE
Maximum switching frequency 625 kHz 625 kHz 625 kHz
Temperature level COMMERCIAL COMMERCIAL COMMERCIAL
Terminal form GULL WING GULL WING GULL WING
Terminal location DUAL DUAL DUAL
Brand Name Linear Technology Linear Technology -
Is it Rohs certified? incompatible incompatible -
Maker Linear ( ADI ) Linear ( ADI ) -
Parts packaging code MSOP SOIC -
package instruction TSSOP, TSSOP8,.19 SOP, SOP8,.25 -
Contacts 8 8 -
Manufacturer packaging code MS8 S8 -
Reach Compliance Code not_compliant not_compliant -
ECCN code EAR99 EAR99 -
Analog Integrated Circuits - Other Types SWITCHING CONTROLLER SWITCHING CONTROLLER -
Maximum input voltage 10 V 10 V -
Minimum input voltage 2 V 2 V -
Nominal input voltage 4.2 V 4.2 V -
JESD-30 code S-PDSO-G8 R-PDSO-G8 -
JESD-609 code e0 e0 -
length 3 mm 4.9 mm -
Humidity sensitivity level 1 1 -
Package body material PLASTIC/EPOXY PLASTIC/EPOXY -
encapsulated code TSSOP SOP -
Encapsulate equivalent code TSSOP8,.19 SOP8,.25 -
Package shape SQUARE RECTANGULAR -
Package form SMALL OUTLINE, THIN PROFILE, SHRINK PITCH SMALL OUTLINE -
Peak Reflow Temperature (Celsius) 235 235 -
Certification status Not Qualified Not Qualified -
Maximum seat height 1.1 mm 1.75 mm -
technology CMOS CMOS -
Terminal surface Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) -
Terminal pitch 0.65 mm 1.27 mm -
Maximum time at peak reflow temperature 20 20 -
width 3 mm 3.9116 mm -
Base Number Matches 1 1 -

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