TPS54283 Datasheet, PDF (3/52 Pages) Texas Instruments – 2-A DUAL NON-SYNCHRONOUS CONVERTER WITH INTEGRATED HIGH-SIDE MOSFET

TPS54283, TPS54286
www.ti.com
SLUS749C – JULY 2007 – REVISED OCTOBER 2007
ELECTRICAL CHARACTERISTICS
–40°C ≤ T_J ≤ +125°C, V_PVDD1 = V_PVDD2 = 12 V, unless otherwise noted.
PARAMETER
TEST CONDITIONS
INPUT SUPPLY (PVDD)
V_PVDD1
V_PVDD2
IDD_SDN
IDD_Q
IDD_SW
Input voltage range
Shutdown
Quiescent, non-switching
Quiescent, while-switching
V_EN1 = V_EN2 = V_PVDD2
V_FB = 0.9V, Outputs off
SW node unloaded; Measured as BP sink
current
V_UVLO
V_UVLO(hys)
t_START ^{(1) (2)}
Minimum turn-on voltage
Hysteresis
Time from startup to softstart begin
PVDD2 only
C_BP = 10 µF, EN1 and EN2 go low
simultaneously
ENABLE (EN)
V_EN1
V_EN2
Enable threshold
Hysteresis
I_EN1
I_EN2
t_EN ⁽¹⁾
Enable pull-up current
Time from enable to soft-start begin
BP REGULATOR (BP)
V_EN1 = V_EN2 = 0 V
Other EN pin = GND
BP
Regulator voltage
BP_LDO
Dropout voltage
I_BP ⁽¹⁾
Regulator external load
I_BPS
Regulator short circuit
OSCILLATOR
8 V < P_VDD2 < 28 V
P_VDD2 = 4.5 V; switching, no external load on
BP
4.5 V < P_VDD2 < 28 V
f_SW
Switching frequency
TPS54283
TPS54286
t_DEAD ⁽¹⁾
Clock dead time
ERROR AMPLIFIER (EA) and VOLTAGE REFERENCE (REF)
V_FB1
V_FB2
Feedback input voltage
I_FB1
I_FB2
g_M1 ⁽¹⁾
g_M2 ⁽¹⁾
Feedback input bias current
Transconductance
SOFT START (SS)
0°C < T_J < +85°C
–40°C < T_J < +125°C
T_SS1
T_SS2
Soft start time
OVERCURRENT PROTECTION
I_CL1
Current limit channel 1
I_CL2
Current limit channel 2
V_UV1
V_UV2
T_HICCUP ⁽¹⁾
t_ON1(oc) ⁽¹⁾
t_ON2(oc) ⁽¹⁾
Low-level output threshold to declare a fault
Hiccup timeout
Minimum overcurrent pulse width
V_ILIM2 = V_BP
V_ILIM2 = (floating)
V_ILIM2 = GND
Measured at feedback pin.
MIN TYP MAX UNIT
4.5
28
V
70
150 µA
1.8
3.0
mA
5
3.8
4.1
400
4.4
V
mV
2
ms
0.9
1.2
1.5
V
50
mV
6
12 µA
10
µs
5 5.25
400
10
20
5.6
V
mV
2
mA
30
255
310
375
kHz
510
630
750
140
ns
788
800
812
mV
786
812
3
50 nA
30
µS
1.5
2.1
2.7 ms
2.4
3.0
3.6
1.15 1.50 1.75
A
2.4
3.0
3.6
1.15 1.50 1.75
670
mV
10
ms
90
150 ns
(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
Submit Documentation Feedback
3
Product Folder Link(s): TPS54283 TPS54286