TPS51285A
TPS51285B
www.ti.com
SLVSBX0 –APRIL 2013
ELECTRICAL CHARACTERISTICS (continued)
over operating free-air temperature range, VVIN = 12 V, VVO1 = 5 V, VVFB1 = VVFB2 = 2 V, VEN1 = VEN2 = 3.3 V, VCLK: 200 Ω to
GND
(unless otherwise noted)
PARAMETER
TEST CONDITION
MIN
TYP
MAX
UNIT
OUTPUT DISCHARGE
TA = 25°C, VVO1 = 0.5 V
VEN1 = VEN2 = 0 V
RDIS1
CH1 discharge resistance
CH2 discharge resistance
35
Ω
Ω
TPS51285A
TPS51285B
75
70
RDIS2
TA = 25°C, VSW2 = 0.5 V, VEN1 = VEN2 = 0 V
SOFT START
tSS
Soft-start time (From ENx Hi)
Soft-start time (ramp-up)
From ENx="Hi" and VVREG5 > VUVLO5 to VOUT = 95%
VOUT= 0% to VOUT = 95%, VVREG5 = 5 V
0.91
0.78
ms
ms
tSSRAMP
POWER GOOD
tPGDEL
VPGTH
IPGMAX
IPGLK
PG start-up delay
From EN1 = "Hi", EN2 = "Hi", and VVREG5 > VUVLO5
PGOOD in from lower (start-up)
VPGOOD = 0.5 V
1.65
ms
PG threshold
87.5%
90% 92.5%
PG sink current
PG leak current
6.5
mA
µA
VPGOOD = 5.5 V
1
CURRENT SENSING
ICS
CS source current
CS current temperature coefficient
TA = 25°C, VCS = 0.4 V
On the basis of 25°C
45
50
55
2
µA
ppm/°C
V
(2)
TCCS
VCS
4500
CS Current limit setting range
0.2
5
Positive
10
VAZCADJ
Adaptive zero cross adjustable range
mV
Negative
–10
–5
1.6
1
LOGIC THRESHOLD
VENX(ON)
VENX(OFF)
IEN
EN threshold high-level
SMPS on level
SMPS off level
VENx= 3.3 V
V
V
EN threshold low-level
EN input current
0.3
µA
OUTPUT OVERVOLTAGE PROTECTION
VOVP
OVP trip threshold
112.5%
115% 117.5%
0.5
tOVPDLY
OVP propagation delay
TA = 25°C
µs
OUTPUT UNDERVOLTAGE PROTECTION
VUVP
UVP trip Threshold
UVP trip Threshold
UVP prop delay
55%
60%
65%
VUVP-ST
tUVPDLY
tUVPENDLY
UVLO
Start Up
87.5%
90% 92.5%
250
1.1
µs
UVP enable delay
From ENx ="Hi", VVREG5 = 5V
ms
Wake up
Shutdown
Wake up
Shutdown
Wake up
Shutdown
4.2
3.75
4.08
3.7
4.58
4.1
4.38
4
4.95
4.45
4.55
4.3
V
V
V
V
V
V
VUVL0VIN
VUVLO5
VUVLO3
VIN UVLO Threshold
VREG5 UVLO Threshold
VREG3 UVLO Threshold
3
3.15
3
3.26
3.21
2.75
(2) Specified by design. Not production tested.
Copyright © 2013, Texas Instruments Incorporated
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