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TPS54810
SLVS420B − MARCH 2002 − R EVISED FEBRUARY 2005
www.ti.com
3
ELECTRICAL CHARACTERISTICS
T
J
= −40°C to 125°C, V
I
= 4 V to 6 V unless otherwise noted
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
SUPPLY VOLTAGE, VIN
Input voltage range, VIN 4.0 6.0 V
f
s
= 350 kHz, SYNC ≤ 0.8 V, RT open,
PH pin open
11 15.8
I
(Q)
Quiescent current
f
s
= 550 kHz, SYNC ≥ 2.5 V, RT open,
PH pin open
16 23.5
mA
Shutdown, SS/ENA = 0 V 1.0 1.4
UNDER VOLTAGE LOCK OUT
Start threshold voltage, UVLO 3.8 3.85 V
Stop threshold voltage, UVLO 3.40 3.50 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
= 4 A, f
s
= 350 kHz, T
J
= 85°C 0.04
%/V
Line regulation
(1)
(3)
I
L
= 4 A, f
s
= 550 kHz, T
J
= 85°C 0.04
%/V
Load regulation
(1)
(3)
I
L
= 0 A to 8 A, f
s
= 350 kHz, T
J
= 85°C 0.03
%/A
Load regulation
(1)
(3)
I
L
= 0 A to 8 A, f
s
= 550 kHz, T
J
= 85°C 0.03
%/A
OSCILLATOR
Internally set free running frequency range
SYNC ≤ 0.8 V, RT open 280 350 420
kHz
Internally set—free running frequency range
SYNC ≥ 2.5 V, RT open 440 550 660
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
High level threshold, SYNC 2.5 V
Low level threshold, SYNC 0.8 V
Pulse duration, external sychronization, SYNC
(1)
50 ns
Frequency range, SYNC
(1)
330 700 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
(1)
90%
(1)
Specified by design
(2)
Static resistive loads only
(3)
Specified by the circuit used in Figure 9