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LM2737 Fiches technique(PDF) 4 Page - Texas Instruments

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No de pièce LM2737
Description  LM2727/LM2737 N-Channel FET Synchronous Buck Regulator Controller for Low Output
Download  31 Pages
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

LM2737 Fiches technique(HTML) 4 Page - Texas Instruments

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LM2727, LM2737
SNVS205D – AUGUST 2002 – REVISED MARCH 2013
www.ti.com
Electrical Characteristics (continued)
VCC = 5V unless otherwise indicated. Typicals and limits appearing in plain type apply for TA=TJ=+25°C. Limits appearing in
boldface type apply over full Operating Temperature Range. Datasheet min/max specification limits are ensured by design,
test, or statistical analysis.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
ERROR AMPLIFIER
GBW
Error Amplifier Unity Gain
5
MHz
Bandwidth
G
Error Amplifier DC Gain
60
dB
SR
Error Amplifier Slew Rate
6
V/µA
IFB
FB Pin Bias Current
FB = 0.55V
0
15
100
nA
FB = 0.65V
0
30
155
IEAO
EAO Pin Current Sourcing and
VEAO = 2.5, FB = 0.55V
2.8
mA
Sinking
VEAO = 2.5, FB = 0.65V
0.8
VEA
Error Amplifier Maximum Swing
Minimum
1.2
V
Maximum
3.2
GATE DRIVE
IQ-BOOT
BOOT Pin Quiescent Current
BOOTV = 12V, EN = 0
0°C to +125°C
95
160
µA
-40°C to +125°C
95
215
RDS1
Top FET Driver Pull-Up ON
BOOT-SW = 5V@350mA
3
resistance
RDS2
Top FET Driver Pull-Down ON
BOOT-SW = 5V@350mA
2
resistance
RDS3
Bottom FET Driver Pull-Up ON
BOOT-SW = 5V@350mA
3
resistance
RDS4
Bottom FET Driver Pull-Down ON
BOOT-SW = 5V@350mA
2
resistance
OSCILLATOR
RFADJ = 590kΩ
50
RFADJ = 88.7kΩ
300
RFADJ = 42.2kΩ, 0°C to +125°C
500
600
700
fOSC
PWM Frequency
kHz
RFADJ = 42.2kΩ, -40°C to +125°C
490
600
700
RFADJ = 17.4kΩ
1400
RFADJ = 11.3kΩ
2000
D
Max Duty Cycle
fPWM = 300kHz
90
%
fPWM = 600kHz
88
LOGIC INPUTS AND OUTPUTS
VSD-IH
SD Pin Logic High Trip Point
2.6
3.5
V
VSD-IL
SD Pin Logic Low Trip Point
0°C to +125°C
1.3
1.6
V
-40°C to +125°C
1.25
1.6
VPWGD-TH-LO
PWGD Pin Trip Points
FB Voltage Going Down
0°C to +125°C
0.413
0.430
0.446
V
-40°C to +125°C
0.410
0.430
0.446
VPWGD-TH-HI
PWGD Pin Trip Points
FB Voltage Going Up
0°C to +125°C
0.691
0.710
0.734
V
-40°C to +125°C
0.688
0.710
0.734
VPWGD-HYS
PWGD Hysteresis (LM2737 only)
FB Voltage Going Down FB Voltage
35
mV
Going Up
110
4
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Product Folder Links: LM2727 LM2737


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