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LTC1627IS8#TR

Description
Conv DC-DC 2.65V to 8.5V Synchronous Step Down Single-Out 0.8V to 8.5V 0.5A 8-Pin SOIC N T/R
File Size226KB,16 Pages
ManufacturerADI
Websitehttps://www.analog.com
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LTC1627IS8#TR Overview

Conv DC-DC 2.65V to 8.5V Synchronous Step Down Single-Out 0.8V to 8.5V 0.5A 8-Pin SOIC N T/R

LTC1627IS8#TR Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesNot Compliant
ECCN (US)EAR99
Part StatusUnconfirmed
SVHCYes
SVHC Exceeds ThresholdYes
TypeSynchronous Step Down
Output TypeAdjustable
Switching Frequency (kHz)385
Switching RegulatorYes
Number of Outputs1
Output Voltage (V)0.8 to 8.5
Maximum Output Current (A)0.5
Minimum Input Voltage (V)2.65
Maximum Input Voltage (V)8.5
Operating Supply Voltage (V)2.65 to 8.5
Typical Quiescent Current (uA)200
Line Regulation0.01%/V
Load Regulation0.8%
Efficiency (%)96
Minimum Operating Temperature (°C)-40
Maximum Operating Temperature (°C)85
Supplier Temperature GradeIndustrial
PackagingTape and Reel
Pin Count8
Standard Package NameSOP
Supplier PackageSOIC N
MountingSurface Mount
Package Height1.5(Max)
Package Length5(Max)
Package Width3.99(Max)
PCB changed8
Lead ShapeGull-wing
LTC1627
Monolithic Synchronous
Step-Down Switching Regulator
FEATURES
s
s
s
s
s
s
s
s
s
s
s
DESCRIPTIO
s
s
s
s
High Efficiency: Up to 96%
Constant Frequency 350kHz Operation
2.65V to 8.5V V
IN
Range
V
OUT
from 0.8V to V
IN
, I
OUT
to 500mA
No Schottky Diode Required
Synchronizable Up to 525kHz
Selectable Burst Mode
TM
Operation
Low Dropout Operation: 100% Duty Cycle
Precision 2.5V Undervoltage Lockout
Secondary Winding Regulation
Current Mode Operation for Excellent Line and
Load Transient Response
Low Quiescent Current: 200µA
Shutdown Mode Draws Only 15µA Supply Current
±1.5%
Reference Accuracy
Available in 8-Lead SO Package
The LTC
®
1627 is a monolithic current mode synchronous
buck regulator using a fixed frequency architecture. The
operating supply range is from 8.5V down to 2.65V, making
it suitable for one or two 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-operated
systems.
The operating frequency is internally set at 350kHz, allowing
the use of small surface mount inductors. For switching noise
sensitive applications it can be externally synchronized up to
525kHz. The SYNC/FCB control pin guarantees regulation of
secondary windings regardless of load on the main output by
forcing continuous operation. Burst Mode operation is inhib-
ited during synchronization or when the SYNC/FCB pin is
pulled low to reduce noise and RF interference. Soft-start is
provided by an external capacitor.
Optional bootstrapping enhances the internal switch drive for
single lithium-ion cell applications. The internal synchronous
switch increases efficiency and eliminates the need for an
external Schottky diode, saving components and board
space. The LTC1627 comes in an 8-lead SO package.
, 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
s
Cellular Telephones
Portable Instruments
Wireless Modems
RF Communications
Distributed Power Systems
Scanners
Single and Dual Cell Lithium
TYPICAL APPLICATIO
1
47pF
C
SS
0.1µF
2
3
4
I
TH
SYNC/FCB
8
7
6
5
RUN/SS
V
DR
LTC1627
V
FB
GND
V
IN
SW
100
V
OUT
= 3.3V
95
V
IN
= 6V
EFFICIENCY (%)
90
85
80
75
70
V
IN
= 8.4V
V
IN
= 3.6V
L1 15µH
C
OUT
100µF
6.3V
+
V
OUT
3.3V
249k
+
V
IN
2.8V*
TO 8.5V
C
IN
22µF
16V
*V
OUT
CONNECTED TO V
IN
FOR 2.8V < V
IN
< 3.3V
80.6k
1627 F01a
1
Figure 1a. High Efficiency Step-Down Converter
Figure 1b. Efficiency vs Output Load Current
U
10
100
OUTPUT CURRENT (mA)
1000
1627 F01b
U
U
1

LTC1627IS8#TR Related Products

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Description Conv DC-DC 2.65V to 8.5V Synchronous Step Down Single-Out 0.8V to 8.5V 0.5A 8-Pin SOIC N T/R Conv DC-DC 2.65V to 8.5V Synchronous Step Down Single-Out 0.8V to 8.5V 0.5A 8-Pin SOIC N Tube Conv DC-DC 2.65V to 8.5V Synchronous Step Down Single-Out 0.8V to 8.5V 0.5A 8-Pin SOIC N T/R Conv DC-DC 2.65V to 8.5V Synchronous Step Down Single-Out 0.8V to 8.5V 0.5A 8-Pin SOIC N T/R Conv DC-DC 2.65V to 8.5V Synchronous Step Down Single-Out 0.8V to 8.5V 0.5A 8-Pin SOIC N Conv DC-DC 2.65V to 8.5V Synchronous Step Down Single-Out 0.8V to 8.5V 0.5A 8-Pin SOIC N Tube Conv DC-DC 2.65V to 8.5V Synchronous Step Down Single-Out 0.8V to 8.5V 0.5A 8-Pin SOIC N T/R
EU restricts the use of certain hazardous substances Not Compliant - Not Compliant Compliant Not Compliant Compliant Compliant
ECCN (US) EAR99 - EAR99 EAR99 EAR99 EAR99 EAR99
Part Status Unconfirmed - Unconfirmed Active Unconfirmed Active Active
Type Synchronous Step Down - Synchronous Step Down Synchronous Step Down Synchronous Step Down Synchronous Step Down Synchronous Step Down
Output Type Adjustable - Adjustable Adjustable Adjustable Adjustable Adjustable
Switching Frequency (kHz) 385 - 385 385 385 385 385
Switching Regulator Yes - Yes Yes Yes Yes Yes
Number of Outputs 1 - 1 1 1 1 1
Output Voltage (V) 0.8 to 8.5 - 0.8 to 8.5 0.8 to 8.5 0.8 to 8.5 0.8 to 8.5 0.8 to 8.5
Maximum Output Current (A) 0.5 - 0.5 0.5 0.5 0.5 0.5
Minimum Input Voltage (V) 2.65 - 2.65 2.65 2.65 2.65 2.65
Maximum Input Voltage (V) 8.5 - 8.5 8.5 8.5 8.5 8.5
Operating Supply Voltage (V) 2.65 to 8.5 - 2.65 to 8.5 2.65 to 8.5 2.65 to 8.5 2.65 to 8.5 2.65 to 8.5
Typical Quiescent Current (uA) 200 - 200 200 200 200 200
Line Regulation 0.01%/V - 0.01%/V 0.01%/V 0.01%/V 0.01%/V 0.01%/V
Load Regulation 0.8% - 0.8% 0.8% 0.8% 0.8% 0.8%
Efficiency (%) 96 - 96 96 96 96 96
Maximum Operating Temperature (°C) 85 - 70 70 70 85 85
Supplier Temperature Grade Industrial - Commercial Commercial Commercial Industrial Industrial
Packaging Tape and Reel - Tape and Reel Tape and Reel - Tube Tape and Reel
Pin Count 8 - 8 8 8 8 8
Standard Package Name SOP - SOP SOP SOP SOP SOP
Supplier Package SOIC N - SOIC N SOIC N SOIC N SOIC N SOIC N
Mounting Surface Mount - Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount
Package Height 1.5(Max) - 1.5(Max) 1.5(Max) 1.5(Max) 1.5(Max) 1.5(Max)
Package Length 5(Max) - 5(Max) 5(Max) 5(Max) 5(Max) 5(Max)
Package Width 3.99(Max) - 3.99(Max) 3.99(Max) 3.99(Max) 3.99(Max) 3.99(Max)
PCB changed 8 - 8 8 8 8 8
Lead Shape Gull-wing - Gull-wing Gull-wing Gull-wing Gull-wing Gull-wing
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