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| TPS54122 Datasheet, PDF (6/40 Pages) Texas Instruments – Dual-Output, 3-A, QuietSupply With Integrated DC-DC Converter and Low-Noise LDO | |||
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TPS54122
SBVS221B â NOVEMBER 2013 â REVISED AUGUST 2016
www.ti.com
Electrical Characteristics (continued)
at TJ = â40°C to +125°C, VBIAS = VVIN = 5 V, VLDOIN = DC-DC_OUT(1) = 2.1 V, VLDOEN = 1.1 V, VO = 1.8 V, IO = 50 mA, VEN =
floating, and COUT = 10.0 μF, unless otherwise noted.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNIT
DC-DC POWER GOOD (PWRGD PIN)
LDO
VSENSE pin threshold
High-level output leakage current
Low-level output voltage
Minimum VIN voltage for valid output
VSENSE falling (fault)
VSENSE rising (good)
VSENSE rising (fault)
VSENSE falling (good)
VVSENSE = Vref, VPWRGD = 5.5 V, VEN = 3 V
IPWRGD = 3 mA
VPWRGD < 0.5 V at 100 µA
0.91 Vref
0.93 Vref
1.07 Vref
1.05 Vref
2
0.3
1.2
V
V
V
V
nA
0.6
V
1.6
V
VLDOIN
VBIAS
VFB
VO
LDO input voltage range
LDO bias input voltage range
FB pin voltage
OUT pin voltage range
OUT pin voltage accuracy
ÎVO(ÎIL)
Load regulation
ÎVO(ÎVI)
VDO(LDOIN)
VDO(BIAS)
ILIM
IBIAS
ISD(LDO)
IFB
ILDOEN
VIL(LDOEN)
Line regulation
VLDOIN dropout voltage
VBIAS dropout voltage
Output current limit
BIAS pin current
Shutdown current (IBIAS)
FB pin current
LDOEN pin input current
LDOEN pin low-level input voltage
(disable)
TA = 25°C
VO = VFB, 50 mA ⤠IO < 3 A,
2.97 V ⤠VBIAS ⤠5.25 V,
VLDOIN ⥠VOUT(nom) + 0.3 V,
VBIAS ⥠VOUT(nom) + 1.62 V
0 mA ⤠IOUT ⤠50 mA
50 mA ⤠IOUT ⤠3 A
VOUT(nom) + 0.3 V ⤠VLDOIN ⤠5.5 V
IO ⤠3.0 A, VBIAS â VOUT(nom) ⥠1.62 V
IO ⤠3.0 A, VLDOIN = VBIAS
VO = 0.8 Ã VOUT(nom)
VEN < 0.4 V
VEN = 5 V
VO + VDO
2.375
0.796
VFB
â1.0%
0.8
±0.2%
0.013
0.03
0.0005
100
3.8
2
1
â250
95
0.1
5.5
V
5.5
V
0.804
V
3.6
V
1.0%
%/mA
%/A
0.06 %/V
200 mV
1.62
V
6.0
A
4 mA
100 µA
250 nA
1 µA
0.4
V
VIH(LDOEN)
LDOEN pin high-level input voltage
(enable)
1.1
V
PG pin trip threshold
PG pin trip hysteresis
High-level output leakage current
Low-level output voltage
INR
NR pin charging current
THERMAL SHUTDOWN
VFB decreasing
VPG = 5.25 V
IPG = 1 mA
VNR = 0.4 V
0.86 VFB 0.90 VFB 0.94 VFB
V
0.03 VFB
V
0.03
1 µA
0.3
V
0.5
0.73
1 µA
Tsd
Thermal shutdown temperature
Shutdown, temperature increasing
Reset, temperature decreasing
160
°C
140
°C
NOISE
Vn
Output noise voltage
BW = 10 Hz to 1 MHz, CNR = 10 µF,
CFB = 0.1 µF, IO = 1 A , COUT = 100 µF
17
µVRMS
6
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