Datasheet

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TPS51120
SLUS670B – JULY 2005 – REVISED FEBRUARY 2007
ELECTRICAL CHARACTERISTICS (continued)
over operating free-air temperature range, V
VIN
= 12 V, V
VREG5
= V
V5FILT
= 5 V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
VREG3 VOLTAGE
VREG3 Output Regulation
V
VREG3
I
VREG3
= 20 mA, 6V < VIN < 28V, T
A
= 25 ° C 3.25 3.30 3.35
Voltage
I
VREG3
= 1 - 50 mA , 6V < VIN < 28V, T
A
= 0 to 85 ° C 3.21 3.37 V
V
VREG3T
VREG3 Output Voltage Tolerance
I
VREG3
= 1 - 100 mA , 6V < VIN < 28V, T
A
= -40 to
3.16 3.39
85 ° C
I
VREG3
VREG3 Output Current T
A
= 25 ° C, VREG3=3.14V
(1)
170 mA
Rising edge of VO2, VREG3 drops to VO2 voltage 2.85 3.10 V
VREG3 Bootstrap Switch
V
LDO3SW
Threshold
Hysteresis 120 mV
VREG3 Bootstrap Switch
R
LDO3SW
1.3 3.0 Ω
Resistance
VREG5 VOLTAGE
VREG5 Output Regulation
V
VREG5
I
VREG5
= 20 mA, 6V < VIN < 28V, TA= 25 ° C 4.925 5.00 5.075
Voltage
V
VREG5T
VREG5 Output Voltage Tolerance I
VREG5
= 1 - 50 mA , 6V < VIN < 28V, T
A
= 0 to 85 ° C 4.89 5.11 V
I
VREG5
= 1 - 100 mA , 6V < VIN < 28V, T
A
= -40 to
4.80 5.15
85 ° C
I
VREG5
VREG5 Output Current T
A
= 25 ° C, VREG5=4.75 V
(1)
200 mA
Rising edge of VO1, VREG5 drops to VO1 voltage 4.30 4.85 V
VREG5 Bootstrap Switch
V
LDO5SW
Threshold
Hysteresis 140 mV
VREG5 Bootstrap Switch
R
LDO5SW
1.3 3.0 Ω
Resistance
TRANSCONDUCTANCE AMPLIFIER
Gm Gain T
A
= 25 ° C 280 µ S
I
COMPSINK
COMP Maximum Sink Current VFBx=1.05V, COMPx=1.28V 8 12 16
µ A
I
COMPSRC
COMP Maximum Source Current VFBx=0.95V, COMPx=1.28V -15 -11 -7
V
COMPHI
COMP High Clamp Voltage CSx=0V, VFBx=0.95V 1.26 1.34 1.42
V
V
COMPLO
COMP Low Clamp Voltage CSx=0V, VFBx=1.05V 1.08 1.12 1.20
OUTPUT DRIVER
Source, V
VBST-DRVH
= 1V 3.5 7
R
DRVH
DRVH resistance
Sink, V
DRVH-LL
= 1V 1.5 3
Ω
Source, V
VREG5-DRVL
= 1V 3.5 7
R
DRVL
DRVL resistance
Sink, V
DRVL-PGND
= 1V 1.5 3
DRVH-off to DRVL-on, T
A
= 25 ° C 20
T
D
Dead time ns
DRVL-off to DRVH-on, T
A
= 25 ° C 30 60
V
DTH
DRVH-off threshold LL to GND
(1)
2
V
V
DTL
DRVL-off threshold DRVL to GND
(1)
1.1
INTERNAL BST DIODE
V
FBST
Forward Voltage V
VREG5-VBST
, I
F
= 10 mA, T
A
= 25 ° C 0.7 0.8 0.9 V
I
RBST
Reverse Current VBST = 34 V, VREG5=5V 0.1 1.0
µ A
I
BST(LEAK)
VBST Leakage current VBST=34V, LL=28V, EN3=EN5=EN1=EN2=0V 0.1 1.0
(1) Ensured by design. Not production tested.
5
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