Datasheet

PACKAGE DISSIPATION RATINGS
(1)
ELECTRICAL CHARACTERISTICS
TPS54617
www.ti.com ........................................................................................................................................... SLVS880A – NOVEMBER 2008 – REVISED JANUARY 2009
THERMAL IMPEDANCE THERMAL IMPEDANCE
PACKAGE
JUNCTION-TO-AMBIENT JUNCTION-TO-CASE
34-Pin RUV with solder 14.5 ° C/W 0.5 ° C/W
(2)
(1) Test board conditions:
a. 3 inch × 3 inch, 4 layers, Thickness: 0.062 inch
b. 2.0 oz copper traces located on the top of the PCB
c. 2.0 oz copper ground plane on the bottom of the PCB
d. 2.0 oz copper ground planes on the 2 internal layers
e. 12 thermal vias
(2) Maximum power dissipation may be limited by overcurrent protection.
T
J
= – 40 ° C to 125 ° C, V
I
= 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, PH pin open 9.2 15.8
Quiescent current f
s
= 550 kHz, SYNC ≥ 2.5 V, RT open, PH pin open 13.9 23.5 mA
Shutdown, SS/ENA = 0 V 1 1.4
UNDER VOLTAGE LOCK OUT
Start threshold voltage, UVLO 2.95 3.0
V
Stop threshold voltage, UVLO 2.70 2.80
Hysteresis voltage, UVLO 0.16 V
Rising and falling edge deglitch, 2.5 µ s
UVLO
(1)
BIAS VOLTAGE
Output voltage, VBIAS I
(VBIAS)
= 0 2.70 2.80 2.90 V
V
O
Output current, VBIAS
(2)
100 µ A
CUMULATIVE REFERENCE
V
ref
Accuracy 0.882 0.891 0.900 V
REGULATION
I
L
= 3 A, f
s
= 350 kHz, T
J
= 85 ° C 0.04
Line regulation
(1)
%/V
I
L
= 3 A, f
s
= 550 kHz, T
J
= 85 ° C 0.04
I
L
= 0 A to 6 A, f
s
= 350 kHz, T
J
= 85 ° C 0.03
Load regulation
(1)
%/A
I
L
= 0 A to 6 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
kHz
range
SYNC ≥ 2.5 V, RT open 440 550 660
RT = 100 k Ω (1% resistor to AGND) 460 500 540
Externally set free-running frequency
kHz
range
RT = 27 k Ω (1% resistor to AGND) 1480 1600 1720
High-level threshold voltage, SYNC 2.5 V
Low-level threshold voltage, SYNC 0.8 V
Pulse duration, SYNC
(1)
50
Frequency range, SYNC 330 1600 kHz
Ramp valley
(1)
0.75 V
Ramp amplitude (peak-to-peak)
(1)
1 V
Minimum controllable on time 160 ns
Maximum duty cycle 90%
(1) Specified by design
(2) Static resistive loads only
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