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TPS54310
SLVS412A – DECEMBER 2001 – REVISED JUNE 2002
ELECTRICAL CHARACTERISTICS
TJ = –40°C to 125°C, VIN = 3 V to 6 V (unless otherwise noted)
PARAMETER
SUPPLY VOLTAGE, VIN
VIN input voltage range
fs = 350 kHz, SYNC = 0.8 V, RT open
fs = 550 kHz, SYNC
≥
2.5 V, RT open,
phase pin open
Shutdown,
UNDER VOLTAGE LOCK OUT
Start threshold voltage, UVLO
Stop threshold voltage, UVLO
Hysteresis voltage, UVLO
Rising and falling edge deglitch, UVLO(1)
BIAS VOLTAGE
VO
Output voltage, VBIAS
Output current, VBIAS(2)
I(VBIAS) = 0
2.70
2.80
2.90
100
V
µA
V
2.70
0.14
2.95
2.80
0.16
2.5
3
V
V
µs
SS/ENA = 0 V
3
6.2
8.4
1
6
9.6
12.8
1.4
mA
V
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Quiescent current
CUMULATIVE REFERENCE
Vref
Accuracy
0.882
0.891
0.900
REGULATION
Line regulation
Lineregulation(1) (3)
Load regulation (1) (3)
OSCILLATOR
Internally set free running frequency range
free-running
SYNC
≤
0.8 V,
RT open
280
440
252
460
663
2.5
0.8
50
330
0.75
1
200
90%
700
350
550
280
550
700
420
660
308
660
762
V
V
ns
kHz
V
V
ns
kHz
SYNC
≥
2.5 V, RT open
RT = 180 kΩ (1% resistor to AGND)
Externally set free running frequency range
free-running
High-level threshold voltage, SYNC
Low-level threshold voltage, SYNC
Pulse duration, SYNC(1)
Frequency range, SYNC(1)
Ramp valley(1)
Ramp amplitude (peak-to-peak)(1)
Minimum controllable on time(1)
Maximum duty cycle
(1) Specified by design
(2) Static resistive loads only
(3) Specified by the circuit used in Figure 10.
RT = 100 kΩ (1% resistor to AGND)
RT = 68 kΩ (1% resistor to AGND)
kHz
IL = 1.5 A,
IL = 1.5 A,
IL = 0 A to 3 A,
IL = 0 A to 3 A,
fs = 350 kHz, TJ = 85°C
fs = 550 kHz, TJ = 85°C
fs = 350 kHz, TJ = 85°C
fs = 550 kHz, TJ = 85°C
0.07
0.07
0.03
0.03
%/V
%/A
3
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