TPS54810
SLVS420B − MARCH 2002 − R EVISED FEBRUARY 2005
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3
ELECTRICAL CHARACTERISTICS TJ = −40°C to 125°C, VI = 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
fs = 350 kHz, SYNC≤ 0.8 V, RT open,
PH pin open 11 15.8
I(Q) Quiescent current fs = 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
Vref Accuracy 0.882 0.891 0.900 V
REGULATION
Line regulation(1) (3)
IL = 4 A, fs = 350 kHz, TJ = 85°C 0.04
%/V
Line regulation
(1)
(3)
IL = 4 A, fs = 550 kHz, TJ = 85°C 0.04 %/V
Load regulation(1) (3)
IL = 0 A to 8 A, fs = 350 kHz, TJ = 85°C 0.03
%/A
Load regulation
(1)
(3)
IL = 0 A to 8 A, fs = 550 kHz, TJ = 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