TPS54314PWPR Datasheet, PDF (7/22 Pages) Texas Instruments – 3-V TO 6-V INPUT, 3-A OUTPUT SYNCHRONOUS-BUCK PWM SWITCHER WITH INTEGRATED FETs (SWIFT™)

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TPS54311, TPS54312
TPS54313, TPS54314
TPS54315, TPS54316
SLVS416B − FEBRUARY 2002 − REVISED APRIL 2005
TYPICAL CHARACTERISTICS
DRAIN-SOURCE ON-STATE RESISTANCE
vs
JUNCTION TEMPERATURE
120
V_I = 3.3 V
100
I_O = 3 A
DRAIN-SOURCE ON-STATE RESISTANCE
vs
JUNCTION TEMPERATURE
100
V_I = 5 V
80
I_O = 3 A
80
60
60
40
40
20
20
INTERNALLY SET OSCILLATOR
FREQUENCY
vs
JUNCTION TEMPERATURE
750
650
FSEL ≥ 2.5 V
550
450
FSEL ≤ 0.8 V
350
0
−40
0
25
85
125
T_J − Junction Temperature − °C
Figure 1
EXTERNALLY SET OSCILLATOR
FREQUENCY
vs
JUNCTION TEMPERATURE
800
RT = 68 k
700
600
RT = 100 k
500
400
RT = 180 k
300
200
−40
0
25
85
125
T_J − Junction Temperature − °C
Figure 4
0
−40
0
25
85
125
T_J − Junction Temperature − °C
Figure 2
VOLTAGE REFERENCE
vs
JUNCTION TEMPERATURE
0.895
0.893
0.891
0.889
0.887
0.885
−40
0
25
85
125
T_J − Junction Temperature − °C
Figure 5
250
−40
0
25
85
125
T_J − Junction Temperature − °C
Figure 3
OUTPUT VOLTAGE REGULATION
vs
INPUT VOLTAGE
0.8950
T_A = 85°C
0.8930
0.8910
0.8890
f = 350 kHz
0.8870
0.8850
3
4
5
6
V_I − Input Voltage − V
Figure 6
140
120
100
80
60
40
20
0
−20
0
ERROR AMPLIFIER
OPEN LOOP RESPONSE
0
R_L= 10 kΩ,
C_L = 160 pF,
−20
T_A = 25°C
−40
−60
Phase
−80
Gain
−100
−120
−140
−160
−180
−200
10 100 1 k 10 k 100 k 1 M 10 M
f − Frequency − Hz
Figure 7
INTERNAL SLOW-START TIME
vs
JUNCTION TEMPERATURE
3.80
3.65
3.50
3.35
3.20
3.05
2.90
2.75
−40
0
25
85
125
T_J − Junction Temperature − °C
Figure 8
DEVICE POWER LOSSES
vs
LOAD CURRENT
2.25
2
T_J − 125°C,
f_s = 700 kHz
1.75
1.5
V_I = 3.3 V
1.25
1
0.75
V_I = 5 V
0.5
0.25
0
0
1
2
3
4
I_L − Load Current − A
Figure 9
7