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LM2677T-ADJ Fiches technique(PDF) 4 Page - Texas Instruments

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No de pièce LM2677T-ADJ
Description  LM2677 SIMPLE SWITCHER짰 High Efficiency 5A Step-Down Voltage Regulator
Download  34 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

LM2677T-ADJ Fiches technique(HTML) 4 Page - Texas Instruments

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LM2677
SNVS077I – MAY 2004 – REVISED JUNE 2012
www.ti.com
LM2677-ADJ Electrical Characteristics
Symbol
Parameter
Conditions
Typ(1)
Min(2)
Max(2)
Units
VFB
Feedback Voltage
VIN = 8V to 40V, 100mA ≤ IOUT ≤ 5A
1.186
1.234
1.21
V
VOUT Programmed for 5V
1.174
1.246
η
Efficiency
VIN = 12V, ILOAD = 5A
84
%
(1)
Typical values are determined with TA = TJ = 25°C and represent the most likely norm.
(2)
All limits are specified at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature
limits are 100% tested during production with TA = TJ = 25°C. All limits at temperature extremes are guaranteed via correlation using
standard standard Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).
All Output Voltage Versions Electrical Characteristics
Limits appearing in bold type face apply over the entire junction temperature range of operation,
−40°C to 125°C.
Specifications appearing in normal type apply for TA = TJ = 25°C. Unless otherwise specified VIN=12V for the 3.3V, 5V and
Adjustable versions and VIN=24V for the 12V version, Sync pin open circuited..
Symbol
Parameter
Conditions
Typ
Min
Max
Units
DEVICE PARAMETERS
IQ
Quiescent Current
VFEEDBACK = 8V For 3.3V, 5.0V, and ADJ Versions
VFEEDBACK = 15V For 12V Versions
4.2
6
mA
ISTBY
Standby Quiescent
ON/OFF Pin = 0V
100
50
μA
Current
150
ICL
Current Limit
6.1
8.3
7
A
5.75
8.75
IL
Output Leakage
VIN = 40V, ON/OFF Pin = 0V
200
1
μA
Current
VSWITCH = 0V
15
VSWITCH = −1V
6
mA
RDS(ON)
Switch On-
ISWITCH = 5A
0.14
0.12
Ω
Resistance
0.225
fO
Oscillator
Measured at Switch Pin
260
225
280
kHz
Frequency
D
Duty Cycle
Maximum Duty Cycle
91
%
Minimum Duty Cycle
0
%
IBIAS
Feedback Bias
VFEEDBACK = 1.3V
85
nA
Current
ADJ Version Only
VON/OFF
ON/OFF Threshold
1.4
0.8
2.0
V
Voltage
ION/OFF
ON/OFF Input
ON/OFF Input = 0V
20
45
μA
Current
FSYNC
Synchronization
VSYNC(Pin 5)=3.5V, 50% Duty Cycle
400
KHz
Frequency
VSYNC
SYNC Threshold
1.4
V
Voltage
4
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Copyright © 2004–2012, Texas Instruments Incorporated
Product Folder Links: LM2677


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