Datasheet
TPS54290, TPS54291, TPS54292
www.ti.com
SLUS973 –OCTOBER 2009
ELECTRICAL CHARACTERISTICS
T
J
= –40°C to 125°C, PVDD1 and 2 = 12V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
INPUT SUPPLY
PVDD1, PVDD2 Input voltage range 4.5 18 V
IDD
SDN
Shutdown current EN1=EN2 = PVDD2 (4.5-18V) 80 160 µA
IDD
Q
Quiescent, non-switching FB1 = FB2 = 1 V, Outputs Off 1.65 3.00 mA
IDD
SW
Quiescent, while switching FB1 = FB2 = 0.75V, measured at BP 10 mA
UVLO Minimum turn-on voltage PVDD2 only 3.8 4.1 4.4 V
UVLO
HYS
Hysteresis 460 600 mV
Time from startup to soft start CBP=10µF, EN1 and EN2 go low
t
start
(1) (2)
1.5 ms
begin simultaneously
ENABLE (ACTIVE LOW)
Enable threshold voltage 0.9 1.2 1.5 V
V
ENx
Hysteresis 70 mV
I
ENx
Enable pull-up current 10 µA
Time from enable to soft-start
t
ENx
(1)
Other enable pin = GND 10 µs
begin
BP REGULATOR
BP Regulator voltage 8 V ≤ V
PVDD2
≤ 18 V 5.0 5.2 5.6 V
BP
LDO
Dropout voltage V
PVDD2
= 4.5 V 400 mV
I
BPS
Regulator short current 4.5 V ≤ V
PVDD2
≤ 18 V 25 mA
OSCILLATOR
TPS54290 260 300 360 kHz
f
SW
Oscillator frequency TPS54291 520 600 720
TPS54292 1040 1200 1440 kHz
t
DEAD
(1)
Clock dead time 140 ns
g
M
TRANSCONDUCTANCE AMPLIFIER AND VOLTAGE REFERENCE (Applies to both channels)
0°C < T
J
< 85°C 792 800 808 mV
V
FB
Feedback input voltage
–40ºC < T
J
< 125°C 786 800 812 mV
I
FB
Feedback Input bias current V
FB
=0.8 V 5 50 nA
g
M
(1)
Transconductance 200 325 450 µS
Error amplifier source current 15 30 40 µA
I
SOURCE
V
FB1
=V
FB2
=0.7 V, V
COMP
=0 V
capability
Error amplifier sink current
I
SINK
V
FB1
=V
FB2
=0.9 V, V
COMP
=2 V 15 30 40 µA
capability
SOFT-START (Applies to both channels)
TPS54290 0 V ≤ V
FB
≤ 0.8 V 4.0 5.2 6.0
t
SS
Soft-start time TPS54291 2.0 2.6 3.0 ms
TPS54292 1.0 1.3 1.6
OVERCURRENT PROTECTION
I
CL1
Current limit CH1 1.8 2.2 2.6 A
I
CL2
Current limit CH2 3.2 3.8 4.6 A
TPS54290 30 ms
T
HICCUP
(1)
Hiccup timeout TPS54291 16
TPS54292 8
t
ONOC
(1)
Minimum overcurrent pulse 150 200 ns
(1) Specified by design. Not tested in production.
(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. See Input UVLO and Startup.
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