LM3743_15 Datasheet, PDF (3/38 Pages) Texas Instruments – High-Performance Synchronous Buck Controller with Comprehensive Fault Protection Features

LM3743
www.ti.com
SNVS427E – SEPTEMBER 2006 – REVISED APRIL 2013
Absolute Maximum Ratings⁽¹⁾⁽²⁾
V_CC
SW to GND
Boot to GND
Boot to SW
SS/TRACK, ILIM, COMP/EN,FB to GND
Junction Temperature
Storage Temperature
Soldering Information
ESD Rating⁽³⁾
Lead Temperature (soldering, 10sec)
Infrared or Convention (20sec)
-0.3V to 6V
-0.3V to 6V
-0.3V to 12V
-0.3V to 6V
-0.3V to V_CC
150°C
−65°C to 150°C
260°C
235°C
+ / – 2 kV
(1) Absolute maximum ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for
which the device operates correctly. Operating Ratings do not imply specified performance limits.
(2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability and
specifications.
(3) ESD using the human body model which is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin. Test method is per
JESD22–A114.
Operating Ratings
Supply Voltage Range, V_CC(1)
Junction Temperature Range (T_J)
3.0V to 5.5V
−40°C to +125°C
(1) Practical lower limit of V_CC depends on selection of the external MOSFET. See the MOSFET GATE DRIVE section under Application
Information for further details.
Electrical Characteristics
V_CC = 3.3V, COMP/EN floating unless otherwise indicated in the conditions column. Limits in standard type are for T_J = 25°C
only; limits in boldface type apply over the junction temperature (T_J) 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 T_J =
25°C, and are provided for reference purposes only.
Symbol
Parameter
Conditions
Min
Typ Max Units
SYSTEM PARAMETERS
V_FB
V_UVLO
FB pin voltage in regulation
UVLO thresholds
3.0V ≤ V_CC ≤ 5.5V
Input voltage rising
Input voltage falling
0.786 0.8 0.814 V
2.84 3.0
V
2.45 2.66
I_VCC
Operating V_CC current
Operating V_CC current
Shutdown V_CC current
I_SS/TRACK SS/TRACK pin source current
I_ILIM
ILIM pin source current
V_ILIM
Current Limit Trip Level
I_COMP/EN COMP/EN pin pull-up current
V_HS-CLIM High-side current limit threshold
ERROR AMPLIFER
f_SW = 300 kHz, LM3743-300
f_SW = 1 MHz, LM3743-1000
COMP/EN = 0V
1.5
2.5
mA
1.8
3.0
mA
6
50
µA
V_SS/TRACK = 0V
V_ILIM = 0V
8
10.2 12.5 µA
42.5
50
57.5
µA
–25
0
25
mV
V_COMP/EN = 0V
4
µA
Measured at V_CC pin with respect to SW
500
mV
GBW Error Amplifier Unity Gain Bandwidth
30
MHz
G
Error Amplifier DC Gain
90
dB
SR
Error Amplifier Slew Rate
I_FB
FB pin Bias Current
I_EAO
EAO pin sourcing/sinking current capability
GATE DRIVE
C_COMPENSATION = 2.2 nF, I_EAO = 1 mA
V_COMP/EN = 1.5, V_FB = 0.75V
V_COMP/EN = 1.5, V_FB = 0.85V
0.5
V/µs
10
200
nA
1.7
mA
-1
I_SHDN-BOOT BOOT Pin Shutdown Current
V_BOOT-V_SW = 3.3V, V_COMP/EN = 0V
25
50
µA
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