Datasheet

TPS54110−Q1
SLVS837 − JULY 2008
www.ti.com
3
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 9.6
Quiescent current
f
s
= 550 kHz, Phase pin open, SYNC  2.5 V,
RT open,
5.8 12.8
mA
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
V
Hysteresis voltage, UVLO 0.12 V
Rising and falling edge deglitch, UVLO
(1)
2.5 µs
BIAS VOLTAGE
V
Output voltage, VBIAS I
(VBIAS)
= 0 2.70 2.80 2.95 V
V
O
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
= 0.75 A, f
s
= 350 kHz, T
J
= 85°C 0.05
%/V
Line regulation
(1)
(3)
I
L
= 0.75 A, f
s
= 550 kHz, T
J
= 85°C 0.05
%/V
Load regulation
(1) (3)
I
L
= 0 A to 1.5 A, f
s
= 350 kHz, T
J
= 85°C 0.01
%/A
Load regulation
(1)
(3)
I
L
= 0 A to 1.5 A f
s
= 550 kHz, T
J
= 85°C 0.01
%/A
OSCILLATOR
Internally set free running frequency range
SYNC ≤ 0.8 V, RT open 265 350 440
kHz
Internally set free-running frequency range
SYNC ≥ 2.5 V, RT open 415 550 680
kHz
RT = 180 kΩ (1% resistor to AGND)
(1)
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)
(1)
663 700 762
kHz
High-level threshold voltage, SYNC 2.5 V
Low-level threshold voltage, SYNC 0.8 V
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.