Datasheet
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ELECTRICAL CHARACTERISTICS
TPS40075
SLUS676A – MAY 2006 – REVISED SEPTEMBER 2007
T
A
= – 40 ° C to 85 ° C, V
IN
= 12 V
dc
, R
T
= 90.9 k Ω , I
KFF
= 300 µA, f
SW
= 500 kHz, all parameters at zero power dissipation
(unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
INPUT SUPPLY
V
DD
Input voltage range, VIN 4.5 28 V
OPERATING CURRENT
I
DD
Quiescent current Output drivers not switching 2.5 3.5 mA
LVBP
V
LVBP
Output voltage T
A
= T
J
= 25 ° C 3.9 4.2 4.5 V
OSCILLATOR/RAMP GENERATOR
f
OSC
Accuracy 450 500 550 kHz
V
RT
RT voltage 2.23 2.40 2.58 V
t
ON(min)
Minimum output pulse time
(1)
C
HDRV
= 0 nF 150 ns
V
IH
High-level input voltage, SYNC 2 5
V
V
IL
Low-level input voltage, SYNC 0.8
I
SYNC
Input current, SYNC 5 10 µA
V
FB
= 0 V, 100 kHz ≤ f
SW
≤ 500 kHz 84% 95%
Maximum duty cycle
V
FB
= 0 V, f
SW
= 1 MHz 76% 93%
V
KFF
Feed-forward voltage 0.35 0.40 0.45 V
I
KFF
Feed-forward current operating range
(1)
20 1100 µA
SOFT START
I
SS
Charge current 9.5 12 14.5 µA
t
DSCH
Discharge time C
SS
= 3.9 nF 25 75
µs
C
SS
= 3.9 nF, V
SS
rising from 0.7 V to 1.6
t
SS
Soft-start time 210 290 500
V
V
SSSD
Shutdown threshold, V
SS
falling 225 275 325
V
SSEN
Enable threshold, V
SS
rising 310 410 mV
V
SSSDHYS
Shutdown threshold hysteresis 35 130
DBP
V
DD
> 10 V 7 8 9
V
DBP
Output voltage V
V
VDD
= 4.5 V, I
OUT
= 25 mA 4.0 4.3
ERROR AMPLIFIER
T
A
= T
J
= 25 ° C 0.698 0.700 0.704
V
FB
Feedback regulation voltage total variation 0 ° C ≤ T
A
= T
J
≤ 85 ° C 0.690 0.700 0.707
V
-40 ° C ≤ T
A
= T
J
≤ 85 ° C 0.690 0.700 0.715
V
SS(offset)
Soft-start offset from VSS
(1)
Offset from V
SS
to error amplifier 1
GBWP Gain bandwidth
(1)
5 10 MHz
A
VOL
Open loop gain 50 dB
I
SRC
Output source current 2.5 4.5
mA
I
SINK
Output sink current 2.5 6
I
BIAS
Input bias current V
FB
= 0.7 V – 250 0 nA
SHORT CIRCUIT CURRENT PROTECTION
I
ILIM
Current sink into ILIM pin 115 135 150 µA
V
ILIM(ofst)
Current limit offset voltage V
ILIM
= 11.5 V, (V
SW
- V
ILIM
) V
VDD
= 12 V – 50 – 30 – 10 mV
t
HSC
Minimum HDRV pulse width During short circuit 135 225 ns
Propagation delay to output
(1)
50 ns
t
BLANK
Blanking time
(1)
50 ns
(1) Ensured by design. Not production tested.
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