Datasheet

TPS51220A
www.ti.com SLUS897E –DECEMBER 2008–REVISED JANUARY 2013
ELECTRICAL CHARACTERISTICS (continued)
over operating free-air temperature range, V
EN
= 3.3 V, V
VIN
= 12 V, V
V5SW
= 5 V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
VOLTAGE TRANSCONDUCTANCE AMPLIFIER
g
Mv
Gain T
A
= 25°C 500 μS
V
ID
Differential Input Voltage Range –30 30 mV
T
A
= 0 to 85°C 27 33 μA
I
COMPSINK
COMP Maximum Sink Current COMPx = 1.8 V
T
A
= –40 to 85°C 22 33 μA
I
COMPSRC
COMP Maximum Source Current COMPx = 1.8 V –33 –43 μA
V
COMP
COMP Clamp Voltage 2.18 2.22 2.26 V
V
COMPN
COMP Negative Clamp Voltage 1.73 1.77 1.81 V
CURRENT AMPLIFIER
TRIP = 0V/2V, CSNx = 5V, T
A
= 25°C
(2)
3.333
G
C
Gain
TRIP = 3.3V/5V, CSNx = 5V, T
A
= 25°C
(2)
1.667
V
IC
Common mode Input Voltage Range 0 13 V
V
ID
Differential Input Voltage Range T
A
= 25°C –75 75 mV
POWERGOOD
PG in from lower 92.5% 95% 97.5%
V
THPG
PG threshold PG in from higher 102.5% 105% 107.5%
PG hysteresis 5%
I
PG
PG sink current PGOOD = 0.5 V 5 mA
I
PG(LK)
PG leak current PGOOD = 5 V 0 1 µA
t
PGDLY
PGOOD delay Delay for PG in 0.8 1.0 1.2 ms
SOFTSTART
t
SSDYL
Soft Start Delay Delay for Soft Start, ENx = Hi to SS-ramp starts 200 μs
t
SS
Soft Start Time Internal Soft Start 960 μs
FREQUENCY AND DUTY CONTROL
f
SW
Switching Frequency R
F
= 330 kΩ 273 303 333 kHz
Lo to Hi 0.7 1.3 2 V
V
THRF
RF Threshold
Hysteresis 0.2 V
f
SYNC
Sync Input Frequency Range
(2)
200 1000 kHz
V
(DRVH)
= 90% to 10%, No Load, CCM/ OOA
(2)
120 ns
t
ON(min)
Minimum On Time
V
(DRVH)
= 90% to 10%, No Load, Auto-skip 160 250 ns
t
OFF(min)
Minimum Off Time V
(DRVH)
= 10% to 90%, No Load 290 400 ns
DRVH-off to DRVL-on 10 30 50 ns
t
D
Dead time
DRVL-off to DRVH-on 30 40 70 ns
V
DTH
DRVH-off threshold DRVH to GND
(2)
1 V
V
DTL
DRVL-off threshold DRVL to GND
(2)
1 V
(2) Specified by design. Not production tested.
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