TPS54383, TPS54386
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SLUS774B–AUGUST 2007–REVISED OCTOBER 2007
ELECTRICAL CHARACTERISTICS
–40°C ≤ TJ ≤ +125°C, VPVDD1 = VPVDD2 = 12 V, unless otherwise noted.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
INPUT SUPPLY (PVDD)
VPVDD1
Input voltage range
Shutdown
4.5
28
V
VPVDD2
IDDSDN
IDDQ
VEN1 = VEN2 = VPVDD2
70
150
3.0
µA
Quiescent, non-switching
Quiescent, while-switching
VFB = 0.9 V, Outputs off
1.8
5
mA
SW node unloaded; Measured as BP sink
current
IDDSW
VUVLO
Minimum turn-on voltage
Hysteresis
PVDD2 only
3.8
0.9
4.1
4.4
V
VUVLO(hys)
400
mV
CBP = 10 µF, EN1 and EN2 go low
simultaneously
(1)(2)
tSTART
Time from startup to softstart begin
2
ms
ENABLE (EN)
VEN1
Enable threshold
1.2
50
6
1.5
12
V
VEN2
Hysteresis
mV
µA
µs
IEN1
IEN2
Enable pull-up current
Time from enable to soft-start begin
VEN1 = VEN2 = 0 V
(1)
tEN
Other EN pin = GND
10
BP REGULATOR (BP)
BP
Regulator voltage
8 V < PVDD2 < 28 V
5
5.25
400
5.6
V
PVDD2 = 4.5 V; switching, no external load on
BP
BPLDO
Dropout voltage
mV
(1)
IBP
Regulator external load
Regulator short circuit
2
mA
IBPS
4.5 V < PVDD2 < 28 V
10
20
30
OSCILLATOR
TPS54383
TPS54386
255
510
310
630
140
375
750
fSW
Switching frequency
Clock dead time
kHz
ns
(1)
tDEAD
ERROR AMPLIFIER (EA) and VOLTAGE REFERENCE (REF)
VFB1
0°C < TJ < +85°C
788
786
800
812
812
Feedback input voltage
VFB2
mV
nA
µS
–40°C < TJ < +125°C
IFB1
Feedback input bias current
IFB2
3
50
gM1(1)
Transconductance
gM2(1)
30
SOFT START (SS)
TSS1
Soft start time
TSS2
1.5
2.1
2.7
ms
A
OVERCURRENT PROTECTION
ICL1
Current limit channel 1
Current limit channel 2
3.6
3.6
4.5
4.5
5.6
5.6
VILIM2 = VBP
ICL2
VILIM2 = (floating)
VILIM2 = GND
2.4
3.0
3.6
1.15
1.50
1.75
VUV1
Low-level output threshold to declare a fault
Hiccup timeout
Measured at feedback pin.
670
10
mV
ms
ns
VUV2
(1)
THICCUP
(1)
tON1(oc)
Minimum overcurrent pulse width
90
150
(1)
tON2(oc)
(1) Ensured by design. Not production tested.
(2) When both outputs are started simultaneously, a 20-mA current source charges the BP capacitor. Faster times are possible with a lower
BP capacitor value. More information can be found in the Input UVLO and Startup section.
Copyright © 2007, Texas Instruments Incorporated
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