Datasheet
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PACKAGE DISSIPATION RATINGS
(1) (2)
ELECTRICAL CHARACTERISTICS
TPS54310
SLVS412D – DECEMBER 2001 – REVISED FEBRUARY 2007
THERMAL IMPEDANCE T
A
= 25 ° C T
A
= 70 ° C T
A
= 85 ° C
PACKAGE
JUNCTION-TO-AMBIENT POWER RATING POWER RATING POWER RATING
20-Pin PWP with solder 26 ° C/W 3.85 W
(3)
2.12 W 1.54 W
20-Pin PWP without solder 57.5 ° C/W 1.73 W 0.96 W 0.69 W
(1) For more information on the PWP package, refer to TI technical brief, literature number SLMA002.
(2) Test board conditions:
1. 3 inch × 3 inch, 2 layers, Thickness: 0.062 inch
2. 1.5 oz copper traces located on the top of the PCB
3. 1.5 oz copper ground plane on the bottom of the PCB
4. Ten thermal vias (see recommended land pattern in application section of this data sheet)
(3) Maximum power dissipation may be limited by overcurrent protection.
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 6.2 9.6
Quiescent current f
s
= 550 kHz, SYNC ≥ 2.5 V, RT open, phase pin open 8.4 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
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
V
O
Output current, VBIAS
(2)
100 µA
CUMULATIVE REFERENCE
V
ref
Accuracy 0.882 0.891 0.900 V
REGULATION
I
L
= 1.5 A, f
s
= 350 kHz, T
J
= 85 ° C 0.07
Line regulation
(1) (3)
%/V
I
L
= 1.5 A, f
s
= 550 kHz, T
J
= 85 ° C 0.07
I
L
= 0 A to 3 A, f
s
= 350 kHz, T
J
= 85 ° C 0.03
Load regulation
(1) (3)
%/A
I
L
= 0 A to 3 A, f
s
= 550 kHz, T
J
= 85 ° C 0.03
OSCILLATOR
SYNC ≤ 0.8 V, RT open 280 350 420
Internally set free-running frequency range kHz
SYNC ≥ 2.5 V, RT open 440 550 660
RT = 180 k Ω (1% resistor to AGND)
(1)
252 280 308
Externally set free-running frequency range RT = 100 k Ω (1% resistor to AGND) 460 500 540 kHz
RT = 68 k Ω (1% resistor to AGND)
(1)
663 700 762
High-level threshold voltage, SYNC 2.5 V
Low-level threshold voltage, SYNC 0.8 V
Pulse duration, SYNC
(1)
50
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 10 .
3
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