Datasheet

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ELECTRICAL CHARACTERISTICS
TPS40040 , TPS40041
SLUS700D – MARCH 2006 – REVISED DECEMBER 2007
T
J
= -40 C to 85C VDD = 5 V, (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
Input Supply
VDD Input voltage range 2.25 5.5 V
IDD
sd
Shutdown EN = VDD 100 180 µ A
IDDq Quiescent FB = 0.8 V 1.0 2.0
mA
IDDs Switching current No load at HDRV/LDRV 2.0
UVLO
ON
Minimum turn-on voltage 1.95 2.05 2.15 V
UVLO
HYS
Hysteresis 80 130 200 mV
Oscillator/ Ramp Generator
f
PWM
TPS40040 PWM frequency 2.25 V < VDD < 5.5 V 250 300 350 kHz
f
PWM
TPS40040 PWM frequency VDD = 5.0 V, 0C < T
J
< 70C 270 300 330 kHz
f
PWM
TPS40041 PWM frequency 2.25 V < VDD < 5.5 V 500 600 700 kHz
f
PWM
TPS40041 PWM frequency VDD = 5.0 V, 0C < T
J
< 70C 540 600 660 kHz
V
RAMP
Ramp amplitude PP V
PEAK
– V
VALLEY
0.75 0.87 1.0 V
V
VALLEY
Ramp valley voltage 0.37 V
PWM
MAXDUTY Maximum duty cycle, TPS40040 V
FB
= 0 V, 2.25 V < VDD < 5.5 V 90 95
Maximum duty cycle, TPS40041 V
FB
= 0 V, 2.25 V < VDD < 5.5 V 88 95 %
MINDUTY Minimum duty cycle 0
MIN pulse Minimum width control range before
Minimum controllable pulse width 90 150 ns
width
(1)
jumping to zero.
Error Amplifier
VDD = 5.0 V, 0C < T
J
< 70C 593.5 600.0 606.5
V
FB
FB input voltage mV
2.25 V < VDD < 5.5 V, -40C < T
J
<
590 610
125C
I
FB
FB input bias current 50 150 nA
I
OH
= 0.5 mA, V
FB
= 0 V, VDD = 5.5
V
OH
High level output voltage 2.0 2.5 V
V
V
OL
Low level output voltage I
OL
= 0.5 mA, V
FB
= VDD 80 150 mV
I
OH
Output source current V
COMP
= 0.7 V, V
FB
= GND 1 6
mA
I
OL
Output sink current V
COMP
= 0.7 V, V
FB
= VDD 2 8
G
BW
(1)
Gain bandwidth 5 10 MHz
A
OL
Open loop gain 55 85 dB
Short Circuit Protection
Resistor COMP to GND = 2.4 k Ω , T
J
TH1
Low short circuit threshold voltage 80 105 130
= 25C
Medium short circuit threshold Default: No resistor COMP to GND,
V
TH2
145 180 215 mV
voltage T
J
= 25C
Resistor COMP to GND = 12 k Ω , T
J
V
TH3
High short circuit threshold voltage 250 310 370
= 25C
V
TH(tc)
(1)
Threshold temperature coefficient 3100 ppm
Minimum HDRV pulse time in over
t
ON(oc)
(1)
200
current
ns
t
SWOCblank
SW leading edge blanking pulse in
100
(1)
over current detection
t
HICCUP
Hiccup time between restarts 40 ms
(1) Ensured by design. Not production tested.
Copyright © 2006 – 2007, Texas Instruments Incorporated 3
Product Folder Link(s): TPS40040 TPS40041