Datasheet

TPS54680
SLVS429B − OCTOBER 2002 − REVISED OCTOBER 2005
www.ti.com
3
ELECTRICAL CHARACTERISTICS
over operating free-air temperature range unless otherwise noted
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
SUPPLY VOLTAGE, VIN
Input voltage range, VIN 3.0 6.0 V
I
Quiescent current
f
s
= 350 kHz, RT open,
PH pin open
11 15.8
mA
I
(Q)
Quiescent current
f
s
= 500 kHz, RT = 100 kΩ, PH pin open 16 23.5
mA
Shutdown, ENA = 0 V 1 1.4
UNDER VOLTAGE LOCK OUT
Start threshold voltage, UVLO 2.95 3.0 V
Stop threshold voltage, UVLO 2.70 2.80 V
Hysteresis voltage, UVLO 0.14 0.16 V
Rising and falling edge deglitch, UVLO
(1)
2.5 µs
BIAS VOLTAGE
Output voltage, VBIAS I
(VBIAS)
= 0 2.70 2.80 2.90 V
Output current, VBIAS
(2)
100 µA
CUMULATIVE REFERENCE
V
ref
Accuracy 0.882 0.891 0.900 V
REGULATION
Line regulation
(1)(3)
I
L
= 3 A, f
s
= 350 kHz, T
J
= 85°C 0.04
%/V
Line regulation
(1)(3)
I
L
= 3 A, f
s
= 550 kHz, T
J
= 85°C 0.04
%/V
Load regulation
(1)(3)
I
L
= 0 A to 6 A, f
s
= 350 kHz, T
J
= 85°C 0.03
%/A
Load regulation
(1)(3)
I
L
= 0 A to 6 A, f
s
= 550 kHz, T
J
= 85°C 0.03
%/A
OSCILLATOR
Internally set—free running frequency RT open 280 350 420 kHz
RT = 180 kΩ (1% resistor to AGND) 252 280 308
Externally set—free running frequency range
RT = 100 kΩ (1% resistor to AGND) 460 500 540
kHz
Externally set free running frequency range
RT = 68 kΩ (1% resistor to AGND) 663 700 762
kHz
Ramp valley
(1)
0.75 V
Ramp amplitude (peak-to-peak)
(1)
1 V
Minimum controllable on time
(1)
200 ns
Maximum duty cycle 90%
(1)
Specified by design
(2)
Static resistive loads only
(3)
Specified by the circuit used in Figure 9