Datasheet

TPS54110
www.ti.com SLVS500C –DECEMBER 2003– REVISED FEBRUARY 2011
ELECTRICAL CHARACTERISTICS
T
J
= –40°C to 125°C, VIN = 3 V to 6 V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
SUPPLY VOLTAGE, VIN
VIN input voltage range 3 6 V
f
s
= 350 kHz, SYNC ≤ 0.8 V, RT open 4.5 8.5
f
s
= 550 kHz, Phase pin open,
Quiescent current 5.8 9.6 mA
SYNC ≥ 2.5 V, RT open,
Shutdown, SS/ENA = 0 V 1 1.4
UNDER VOLTAGE LOCK OUT
Start threshold voltage, UVLO 2.95 3
V
Stop threshold voltage, UVLO 2.70 2.80
Hysteresis voltage, UVLO 0.12 V
Rising and falling edge deglitch,
2.5 µs
UVLO
(1)
BIAS VOLTAGE
Output voltage, VBIAS I
(VBIAS)
= 0 2.70 2.80 2.90 V
V
O
Output current, VBIAS
(2)
100 µA
CUMULATIVE REFERENCE
V
ref
Accuracy 0.882 0.891 0.900 V
REGULATION
I
L
= 0.75 A, f
s
= 350 kHz, T
J
= 85°C 0.05
Line regulation
(1)(3)
%/V
I
L
= 0.75 A, f
s
= 550 kHz, T
J
= 85°C 0.05
I
L
= 0 A to 1.5 A, f
s
= 350 kHz, T
J
= 85°C 0.01
Load regulation
(1)(3)
%/A
I
L
= 0 A to 1.5 A f
s
= 550 kHz, T
J
= 85°C 0.01
OSCILLATOR
SYNC ≤ 0.8 V, RT open 280 350 420
Internally set free-running
kHz
frequency range
SYNC ≥ 2.5 V, RT open 440 550 660
RT = 180 kΩ (1% resistor to AGND)
(1)
252 280 308
Externally set free-running
RT = 100 kΩ (1% resistor to AGND) 460 500 540 kHz
frequency range
RT = 68 kΩ (1% resistor to AGND)
(1)
663 700 762
High-level threshold voltage,
2.5 V
SYNC
Low-level threshold voltage,
0.8 V
SYNC
Pulse duration, 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 90 %
(1) Specified by design
(2) Static resistive loads only
(3) Specified by the circuit used in Figure 9.
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Product Folder Link(s): TPS54110