Datasheet
LM2745, LM2748
www.ti.com
SNOSAL2E –APRIL 2005–REVISED APRIL 2013
Absolute Maximum Ratings
(1)(2)
V
CC
-0.3 to 7V
BOOT Voltage -0.3 to 18V
I
SEN
-0.3 to 14V
FREQ/SYNC Voltage -0.5 to V
CC
+ 0.3V
All other pins -0.3 to V
CC
+ 0.3V
Junction Temperature 150°C
Storage Temperature −65°C to 150°C
Soldering Information Lead Temperature (soldering, 10sec) 260°C
Infrared or Convection (20sec) 235°C
ESD Rating
(3)
2kV
(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 100pF capacitor discharged through a 1.5 kΩ resistor into each pin.
Operating Ratings
Supply Voltage Range, V
CC
(1)
3V to 6V
BOOT Voltage Range 1V to 17V
Junction Temperature Range (T
J
) −40°C to +125°C
Thermal Resistance (θ
JA
) 155°C/W
(1) The power MOSFETs can run on a separate 1V to 14V rail (Input voltage, V
IN
). Practical lower limit of V
IN
depends on selection of the
external MOSFET. See the MOSFET GATE DRIVERS section under Application Information for further details.
Electrical Characteristics
V
CC
= 3.3V unless otherwise indicated. Typicals and limits appearing in plain type apply for T
A
= T
J
= 25°C. Limits appearing in
boldface type apply over full Operating Temperature Range. Datasheet min/max specification limits are specified by design,
test, or statistical analysis.
Symbol Parameter Conditions Min Typ Max Units
V
FB
FB Pin Voltage V
CC
= 3V to 6V 0.591 0.6 0.609 V
V
ON
UVLO Thresholds V
CC
Rising 2.79
V
V
CC
Falling 2.42
V
CC
= 3.3V, V
SD
= 3.3V LM2745 1.1 1.7 2.3
f
SW
= 600 kHz
LM2748 1.0 1.5 2.1
Operating V
CC
Current mA
I
Q_VCC
V
CC
= 5V, V
SD
= 3.3V LM2745 1.3 2 2.6
f
SW
= 600 kHz
LM2748 1.0 1.8 2.6
Shutdown V
CC
Current V
CC
= 3.3V, V
SD
= 0V 1 3 µA
t
PWGD1
PWGD Pin Response Time V
FB
Rising 10 µs
t
PWGD2
PWGD Pin Response Time V
FB
Falling 10 µs
I
SS-ON
SS Pin Source Current V
SS
= 0V 7 10 14 µA
I
SS-OC
SS Pin Sink Current During Over V
SS
= 2.0V
90 µA
Current
I
SEN-TH
I
SEN
Pin Source Current Trip Point 25 40 55 µA
I
FB
FB Pin Current Sourcing 20 nA
ERROR AMPLIFIER
GBW Error Amplifier Unity Gain Bandwidth 9 MHz
G Error Amplifier DC Gain 118 dB
SR Error Amplifier Slew Rate 2 V/µs
I
EAO
EAO Pin Current Sourcing and 14
mA
Sinking Capability 16
Copyright © 2005–2013, Texas Instruments Incorporated Submit Documentation Feedback 3
Product Folder Links: LM2745 LM2748