Datasheet

TPS51125
SLUS786G –OCTOBER 2007–REVISED JUNE 2012 www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
over operating free-air temperature range, VIN = 12 V (unless otherwise noted)
PARAMETER CONDITIONS MIN TYP MAX UNIT
V
OUT
DISCHARGE
I
Dischg
VOUT discharge current ENTRIPx = 0 V, VOx = 0.5 V 10 60 mA
OUTPUT DRIVERS
Source, V
BSTx - DRVHx
= 100 mV 4 8
R
DRVH
DRVH resistance
Sink, V
DRVHx - LLx
= 100 mV 1.5 4
Ω
Source, V
VREG5 - DRVLx
= 100 mV 4 8
R
DRVL
DRVL resistance
Sink, V
DRVLx
= 100 mV 1.5 4
DRVHx-off to DRVLx-on 10
t
D
Dead time ns
DRVLx-off to DRVHx-on 30
CLOCK OUTPUT
V
CLKH
High level voltage I
VCLK
= -10 mA, VO1 = 5 V, T
A
= 25 °C 4.84 4.92
V
V
CLKL
Low level voltage I
VCLK
= 10 mA, VO1 = 5 V, T
A
= 25 °C 0.06 0.12
f
CLK
Clock frequency T
A
= 25 °C 175 270 325 kHz
INTERNAL BST DIODE
V
FBST
Forward voltage V
VREG5-VBSTx
, I
F
= 10 mA, T
A
= 25 °C 0.7 0.8 0.9 V
I
VBSTLK
VBST leakage current VBSTx = 34 V, LLx = 28 V, T
A
= 25 °C 0.1 1 μA
DUTY AND FREQUENCY CONTROL
t
ON11
CH1 on time 1 V
IN
= 12 V, VO1 = 5 V, 200 kHz setting 2080
t
ON12
CH1 on time 2 V
IN
= 12 V, VO1 = 5 V, 245 kHz setting 1700
t
ON13
CH1 on time 3 V
IN
= 12 V, VO1 = 5 V, 300 kHz setting 1390
t
ON14
CH1 on time 4 V
IN
= 12 V, VO1 = 5 V, 365 kHz setting 1140
t
ON21
CH2 on time 1 V
IN
= 12 V, VO2 = 3.3 V, 250 kHz setting 1100
ns
t
ON22
CH2 on time 2 V
IN
= 12 V, VO2 = 3.3 V, 305 kHz setting 900
t
ON23
CH2 on time 3 V
IN
= 12 V, VO2 = 3.3 V, 375 kHz setting 730
t
ON24
CH2 on time 4 V
IN
= 12 V, VO2 = 3.3 V, 460 kHz setting 600
t
ON(min)
Minimum on time T
A
= 25 °C 80
t
OFF(min)
Minimum off time T
A
= 25 °C 300
SOFT START
t
SS
Internal SS time Internal soft start 1.1 1.6 2.1 ms
POWERGOOD
PG in from lower 92.50% 95% 97.50%
102.50 107.50
V
THPG
PG threshold PG in from higher 105%
% %
PG hysteresis 2.50% 5% 7.50%
I
PGMAX
PG sink current PGOOD = 0.5 V 5 12 mA
t
PGDEL
PG delay Delay for PG in 350 510 670 μs
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