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LTC1771ES8#PBF

Description
DC/DC Cntrlr Single-OUT Step Down 8-Pin SOIC N Tube
File Size229KB,16 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Parametric View All

LTC1771ES8#PBF Overview

DC/DC Cntrlr Single-OUT Step Down 8-Pin SOIC N Tube

LTC1771ES8#PBF Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesCompliant
ECCN (US)EAR99
Part StatusActive
HTS8542.39.00.01
Number of Outputs1
TopologyStep Down
Maximum Output Current (A)5
Minimum Input Voltage (V)2.8
Maximum Input Voltage (V)20
Operating Supply Voltage (V)2.8 to 20
Maximum Supply Current (mA)0.235
Typical Quiescent Current (mA)0.01
Synchronous RectifierNo
Synchronous ClockNo
ProgrammabilityYes
Minimum Operating Temperature (°C)-40
Maximum Operating Temperature (°C)85
Supplier Temperature GradeExtended
PackagingTube
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
LTC1771
10µA Quiescent Current
High Efficiency Step-Down
DC/DC Controller
FEATURES
s
s
s
s
s
s
s
s
s
DESCRIPTIO
s
s
s
s
Very Low Standby Current: 10µA
Available in Space-Saving 8-Lead MSOP Package
Output Currents: Up to 5A
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
+
22µF
25V
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%
C
FF
5pF
1771 F01
Figure 1. High Efficiency Step-Down Converter
U
LTC1771 Efficiency
V
IN
= 10V
V
IN
= 15V
10
100
1000
LOAD CURRENT (mA)
10000
1771 F01b
U
U
1
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