Datasheet

LM2727, LM2737
SNVS205D –AUGUST 2002–REVISED MARCH 2013 www.ti.com
Electrical Characteristics (continued)
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 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
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 BOOTV = 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@350mA 3 Ω
resistance
R
DS2
Top FET Driver Pull-Down ON
BOOT-SW = 5V@350mA 2 Ω
resistance
R
DS3
Bottom FET Driver Pull-Up ON
BOOT-SW = 5V@350mA 3 Ω
resistance
R
DS4
Bottom FET Driver Pull-Down ON
BOOT-SW = 5V@350mA 2 Ω
resistance
OSCILLATOR
R
FADJ
= 590kΩ 50
R
FADJ
= 88.7kΩ 300
R
FADJ
= 42.2kΩ, 0°C to +125°C 500 600 700
f
OSC
PWM Frequency kHz
R
FADJ
= 42.2kΩ, -40°C to +125°C 490 600 700
R
FADJ
= 17.4kΩ 1400
R
FADJ
= 11.3kΩ 2000
D Max Duty Cycle f
PWM
= 300kHz 90 %
f
PWM
= 600kHz 88
LOGIC INPUTS AND OUTPUTS
V
SD-IH
SD Pin Logic High Trip Point 2.6 3.5 V
V
SD-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
V
PWGD-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
V
PWGD-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
V
PWGD-HYS
PWGD Hysteresis (LM2737 only) FB Voltage Going Down FB Voltage 35
mV
Going Up 110
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