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LM3743 Datenblatt(PDF) 4 Page - Texas Instruments

Teilenummer LM3743
Bauteilbeschribung  High-Performance Synchronous Buck Controller with Comprehensive Fault Protection Features
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Hersteller  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

LM3743 Datenblatt(HTML) 4 Page - Texas Instruments

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LM3743
SNVS427E – SEPTEMBER 2006 – REVISED APRIL 2013
www.ti.com
Electrical Characteristics (continued)
VCC = 3.3V, COMP/EN floating unless otherwise indicated in the conditions column. Limits in standard type are for TJ = 25°C
only; limits in boldface type apply over the junction temperature (TJ) range of -40°C to +125°C. Minimum and Maximum limits
are specified through test, design, or statistical correlation. Typical values represent the most likely parametric norm at TJ =
25°C, and are provided for reference purposes only.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
RHG-UP
High Side MOSFET Driver Pull-up ON
VBOOT-VSW = 3.3V, IHGATE = 350mA
1.6
resistance
(sourcing)
RHG-DN
High Side MOSFET Driver Pull-down ON
VBOOT-VSW = 3.3V, IHGATE = 350mA
1
resistance
(sinking)
RLG-UP
Low Side MOSFET Driver Pull-up ON
VCC = 3.3V, ILGATE = 350mA (sourcing)
1.6
resistance
RLG-DN
Low Side MOSFET Driver Pull-down ON
VCC = 3.3V, ILGATE = 350mA (sinking)
1
resistance
OSCILLATOR
fSW
Oscillator Frequency
3.0V
≤ VCC ≤ 5.5V, LM3743-300
255
300
345
kHz
3.0V
≤ VCC ≤ 5.5V, LM3743-1000
850
1000
1150
DMAX
Max Duty Cycle
fSW = 300 kHz, LM3743-300
85
91
%
fSW = 1 MHz, LM3743-1000
69
76
VRAMP
PWM Ramp Amplitude
1.0
V
LOGIC INPUTS AND OUTPUTS
VCOMP/EN-HI COMP/EN pin logic high trip-point
0.65
0.9
V
VCOMP/EN-LO COMP/EN pin logic low trip-point
0.1
0.45
V
HICCUP MODE
NLSCYCLES
Low-side sensing cycles before hiccup mode
15
Cycles
NLSRESET
Low-side sensing cycles reset without
32
Cycles
activating current limit
VUVP
Under Voltage Protection comparator
400
mV
threshold
tGLICH-UVP
Under Voltage Protection fault time before
7
µs
hiccup mode
tHICCUP
Hiccup timeout
5.5
ms
tSS
Soft-start time coming out of hiccup mode
3.6
ms
THERMAL RESISTANCE
θJA
Junction to Ambient Thermal Resistance
235
°C/W
4
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Product Folder Links: LM3743


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