TPS79801-Q1, TPS79850-Q1
www.ti.com
SLVS822D –MARCH 2009–REVISED AUGUST 2011
ELECTRICAL CHARACTERISTICS
VIN = VOUT(NOM) + 1.0 V or 4.0 V (whichever is greater for either fixed or adjustable versions), ILOAD = 1.0 mA, VEN = 3.0 V,
COUT = CIN = 2.2 μF (unless otherwise noted). For TPS79801, FB pin tied to VOUT. Typical values are at TJ = 25°C.
(1)
PARAMETER
TEST CONDITIONS
ILOAD = 50 mA
VIN = VOUT nom + 0.5 V
TJ
MIN
TYP
MAX
UNIT
VIN
Minimum input voltage
Initial output voltage accuracy
Full range
25°C
3
4
V
-1.5
-3.0
+1.5
Fixed VOUT
%
Output voltage accuracy over line, VIN = VOUT nom + 1 V to 50 V,
load, and full temperature range
Full range
25°C
+3.0
1.294
1.313
ILOAD = 1 mA to 50 mA
Initial output voltage accuracy
VIN = 3 V
1.256
1.237
1.275
1.275
Adjustable VOUT
V
Output voltage accuracy over line,
load, and full temperature range
VIN = 4 V to 50 V, ILOAD = 1 mA to 50 mA
Full range
Line regulation, adjustable VOUT
Line regulation, TPS79850
ΔVIN = 3 V to 50 V
13
15
ΔVOUT/ΔVIN
Full range
mV
VIN = VOUT nom + 0.5 V to 50 V
25°C
20
Load regulation, adjustable VOUT
ΔILOAD = 1 mA to 50 mA
ΔILOAD = 1 mA to 50 mA
Full range
25°C
32
ΔVOUT/ΔIOUT
mV
50
Load regulation, fixed VOUT
Full range
Full range
25°C
90
(3)
Adjustable VOUT Output voltage range(2)
1.275
28
V
85
170
300
150
190
260
350
370
550
80
mV
mV
mV
mV
mV
mV
μA
VIN = VOUT(NOM) – 0.1 V
Full range
25°C
ILOAD = 10 mA,
VIN = VOUT(NOM) – 0.1 V
(5)
VDO
Dropout voltage(4)
Full range
25°C
ILOAD = 50 mA,
VIN = VOUT(NOM) – 0.1 V
Full range
Full range
Full range
Full range
Full range
ILOAD = 0 mA
30
100
400
1.8
ILOAD = 1 mA
180
700
3.3
μA
IGND
GND pin current(6)
VIN = VOUT(NOM)
ILOAD = 10 mA
μA
ILOAD = 50 mA
mA
COUT = 10μF, ILOAD = 50 mA,
VN
IFB
Output voltage noise
BW = 10 Hz to 100 kHz, VIN = 4.3 V,
VOUT = 3.3 V (adjustable used)
25°C
100
μVRMS
FB pin bias current(7)
VIN = 3.0 V
25°C
0.05
0.2
1.5
μA
V
EN pin high (enabled)(8)
EN pin low (shutdown)(8)
EN pin low (shutdown)(8)
OFF to ON, VIN = 6.0 V
Full range
25°C
VEN
ON to OFF, VIN = 6.0 V
0.4 V
0.2 V
V
ON to OFF, VIN = 6.0 V
Full range
Full range
Full range
Full range
V
VEN = 0 V VIN = 6.0 V, ILOAD = 0 mA
VEN = 3 V, VIN = 6.0 V, ILOAD = 0 mA
VIN = 6 V, VEN = 0 V, ILOAD = 0 mA
0.4
0.4
3
2.0
0.5
25
μA
μA
μA
IEN
EN pin current(8)
Ishutdown
PSRR
GND pin current(6)
VIN = 4.3 V, VOUT 3.3-V VRIPPLE = 0.5 VPP
fRIPPLE = 120 Hz, ILOAD = 50 mA
,
Power-supply rejection ratio
25°C
65
dB
Fixed current limit(9)
ΔVOUT = VOUT(NOM) – 0.1 V
ΔVOUT = VOUT(NOM) – 0.1 V
Full range
Full range
60
60
200
200
mA
mA
ILIMIT
Adjustable current limit
(1) Full range TJ = –40°C to 125°C
(2) This parameter is tested and specified under pulse load conditions such that TJ = TA. This device is 100% production tested at
TA = 25°C. Performance at full range is specified by design, characterization, bench to ATE correlation testing, and other statistical
process controls.
(3) This device is limited by a maximum junction temperature of TJ = 125°C. The regulated output voltage specification cannot be applied to
all combinations of various VIN, VOUT, ambient temperature, and IOUT conditions. When operating with large voltage differentials across
the device, the output load must be limited so as not to violate the maximum junction temperature for a given ambient temperature.
(4) In the adjustable version test, the output uses an external voltage divider. This resistor voltage divider is made up of R1 = 215 kΩ and
R2 (bottom resistor) = 340 kΩ. This configuration preloads the output with 6.0μA.
(5) By definition, dropout voltage is the minimum input voltage needed to maintain a given output voltage at a specific load current. For
dropout testing, minimum VIN = VOUT(NOM) × 0.96. This specification ensures that the device is in dropout and takes into account the
output voltage tolerance over the full temperature range.
(6) Ground pin current is tested with VIN = VOUT(NOM) or 3 V, whichever is greater.
(7) FB pin current flows into the FB pin.
(8) EN pin current flows into the EN pin.
(9) Current limit is tested with VIN = VOUT(NOM) + 0.5 V or 3.0 V, whichever is greater. VOUT is forced to VOUT(NOM) – 0.1 V and the output
current is measured.
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