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LM2743MTC Fiches technique(PDF) 5 Page - Texas Instruments

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No de pièce LM2743MTC
Description  LM2743 Low Voltage N-Channel MOSFET Synchronous Buck Regulator Controller
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

LM2743MTC Fiches technique(HTML) 5 Page - Texas Instruments

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LM2743
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SNVS276H – APRIL 2004 – REVISED OCTOBER 2015
6.5 Electrical Characteristics
Typical limits are for TJ = 25°C only, represent the most likely parametric norm at TJ = 25°C, and are provided for reference
purposes only; minimum and maximum limits apply over the junction temperature range of –40°C to 125°C. Unless otherwise
specified, VCC = 3.3 V. Data sheet minimum and maximum specification limits are specified by design, test, or statistical
analysis. (See
(1))
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
VFB
FB Pin Voltage
VCC = 3 V to 6 V
0.588
0.6
0.612
V
UVLO Thresholds
Rising
2.76
VON
V
Falling
2.42
VCC = 3.3 V, VSD = 3.3 V
1
1.5
2.1
Fsw = 600 kHz
Operating VCC Current
mA
IQ_VCC
VCC = 5V, VSD = 3.3 V
1
1.7
2.1
Fsw = 600 kHz
Shutdown VCC Current
VCC = 3.3 V, VSD = 0 V
110
185
µA
tPWGD1
PWGD Pin Response Time
VFB Rising
6
µs
tPWGD2
PWGD Pin Response Time
VFB Falling
6
µs
ISS-ON
SS Pin Source Current
VSS = 0 V
7
10
14
µA
SS Pin Sink Current During Over
VSS = 2.5 V
ISS-OC
90
µA
Current
ISEN-TH
ISEN Pin Source Current Trip Point
25
40
55
µA
ERROR AMPLIFIER
Error Amplifier Unity Gain
GBW
9
MHz
Bandwidth
G
Error Amplifier DC Gain
106
dB
SR
Error Amplifier Slew Rate
3.2
V/µs
EAO Pin Current Sourcing and
VEAO = 1.5, FB = 0.55 V
2.6
IEAO
mA
Sinking Capability
VEAO = 1.5, FB = 0.65 V
9.2
Error Amplifier Output Voltage
Minimum
1
V
VEA
Maximum
2
V
GATE DRIVE
IQ-BOOT
BOOT Pin Quiescent Current
VBOOT = 12 V, VSD = 0
18
90
µA
High-Side MOSFET Driver Pull-Up
RHG_UP
VBOOT = 5 V at 350 mA Sourcing
3
ON resistance
High-Side MOSFET Driver Pull-
RHG_DN
HG = 5 V at 350 mA Sourcing
2
Down ON resistance
Low-Side MOSFET Driver Pull-Up
RLG_UP
VBOOT = 5 V at 350 mA Sourcing
3
ON resistance
Low-Side MOSFET Driver Pull-
RLG_DN
LG = 5 V at 350 mA Sourcing
2
Down ON resistance
OSCILLATOR
RFADJ = 702.1 kΩ
50
RFADJ = 98.74 kΩ
300
fSW
PWM Frequency
kHz
RFADJ = 45.74 kΩ
475
600
725
RFADJ = 24.91 kΩ
1000
Max High-Side Duty Cycle
fSW = 300 kHz
80%
D
fSW = 600 kHz
76%
fSW = 1 MHz
73%
LOGIC INPUTS AND OUTPUTS
Standby High Trip Point
VFB = 0.575 V, VBOOT = 3.3 V, VSD
V STBY-IH
1.1
V
Rising
Standby Low Trip Point
VFB = 0.575 V, VBOOT = 3.3 V, VSD
V STBY-IL
0.232
V
Falling
V SD-IH
SD Pin Logic High Trip Point
VSD Rising
1.3
V
(1)
The power MOSFETs can run on a separate 1-V to 16-V rail (Input voltage, VIN). Practical lower limit of VIN depends on selection of the
external MOSFET.
Copyright © 2004–2015, Texas Instruments Incorporated
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