Datasheet

TPS51123A
SLUSAA6C –APRIL 2011–REVISED SEPTEMBER 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
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
DEAD
Dead time ns
DRVLx-off to DRVHx-on 30
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%
V
THPG
PG threshold PG in from higher 102.50% 105% 107.50%
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
LOGIC THRESHOLD AND SETTING CONDITIONS
Shutdown 0.4
V
EN0
EN0 setting voltage V
Enable 2.4
I
EN0
EN0 current V
EN0
= 0.2 V 2 3.5 5 μA
Shutdown 0.6
V
ENC
ENC threshold voltage V
Enable 2
Shutdown 350 400 450
V
EN(trip)
TRIP1, TRIP2 threshold mV
Hysteresis 10 30 60
200 kHz/250 kHz 1.5
245 kHz/305 kHz 1.9 2.1
V
TONSEL
TONSEL setting voltage V
300 kHz/375 kHz 2.7 3.6
365 kHz/460 kHz 4.7
Auto skip 1.5
V
SKIPSEL
SKIPSEL setting voltage PWM only 1.9 2.1 V
OOA auto skip 2.7
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