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TPS51285BRUKR Datasheet(PDF) 7 Page - Texas Instruments

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Part # TPS51285BRUKR
Description  Ultra-Low Quiescent (ULQ) Dual Synchronous Step-Down Controller with 5V and 3.3V LDOs
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS51285BRUKR Datasheet(HTML) 7 Page - Texas Instruments

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


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