Datasheet

LM2742
SNVS266C –MARCH 2004–REVISED MARCH 2013 www.ti.com
ELECTRICAL CHARACTERISTICS
V
CC
= 5V 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
CC
= 4.5V, 0°C to +125°C 0.591 0.6 0.609
V
CC
= 5V, 0°C to +125°C 0.591 0.6 0.609
V
CC
= 5.5V, 0°C to +125°C 0.591 0.6 0.609
V
FB_ADJ
FB Pin Voltage V
V
CC
= 4.5V, −40°C to +125°C 0.589 0.6 0.609
V
CC
= 5V, −40°C to +125°C 0.589 0.6 0.609
V
CC
= 5.5V, −40°C to +125°C 0.589 0.6 0.609
V
ON
UVLO Thresholds Rising 4.2
V
Falling 3.6
SD = 5V, FB = 0.55V
1 1.5 2
Fsw = 600kHz
Operating V
CC
Current mA
I
Q-V5
SD = 5V, FB = 0.65V
0.8 1.7 2.2
Fsw = 600kHz
Shutdown V
CC
Current SD = 0V 0.15 0.4 0.7 mA
t
PWGD1
PWGD Pin Response Time FB Voltage Going Up 6 µs
t
PWGD2
PWGD Pin Response Time FB Voltage Going Down 6 µs
I
SD
SD Pin Internal Pull-up Current 20 µA
I
SS-ON
SS Pin Source Current SS Voltage = 2.5V
0°C to +125°C 8 11 15 µA
-40°C to +125°C 5 11 15
I
SS-OC
SS Pin Sink Current During Over SS Voltage = 2.5V
95 µA
Current
I
SEN
Pin Source Current Trip Point 0°C to +125°C 35 50 65
I
SEN-TH
µA
-40°C to +125°C 28 50 65
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
I
FB
FB Pin Bias Current FB = 0.55V 0 15 100
nA
FB = 0.65V 0 30 155
I
EAO
EAO Pin Current Sourcing and V
EAO
= 2.5, FB = 0.55V 2.8
mA
Sinking V
EAO
= 2.5, FB = 0.65V 0.8
V
EA
Error Amplifier Maximum Swing Minimum 1.2
V
Maximum 3.2
GATE DRIVE
I
Q-BOOT
BOOT Pin Quiescent Current BOOT = 12V, EN = 0
0°C to +125°C 95 160 µA
-40°C to +125°C 95 215
R
DS1
Top FET Driver Pull-Up ON
BOOT-SW = 5V at 350mA 3 Ω
resistance
R
DS2
Top FET Driver Pull-Down ON
BOOT-SW = 5V at 350mA 2 Ω
resistance
R
DS3
Bottom FET Driver Pull-Up ON
BOOT-SW = 5V at 350mA 3 Ω
resistance
R
DS4
Bottom FET Driver Pull-Down ON
BOOT-SW = 5V at 350mA 2 Ω
resistance
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