Datasheet

TPS79801-Q1, TPS79850-Q1
www.ti.com SLVS822D –MARCH 2009– REVISED AUGUST 2011
ELECTRICAL CHARACTERISTICS
V
IN
= V
OUT(NOM)
+ 1.0 V or 4.0 V (whichever is greater for either fixed or adjustable versions), I
LOAD
= 1.0 mA, V
EN
= 3.0 V,
C
OUT
= C
IN
= 2.2 μF (unless otherwise noted). For TPS79801, FB pin tied to V
OUT
. Typical values are at T
J
= 25°C.
PARAMETER TEST CONDITIONS T
J
(1)
MIN TYP MAX UNIT
V
IN
Minimum input voltage I
LOAD
= 50 mA Full range 3 4 V
Initial output voltage accuracy V
IN
= V
OUT
nom + 0.5 V 25°C -1.5 +1.5
Fixed V
OUT
%
Output voltage accuracy over line, V
IN
= V
OUT
nom + 1 V to 50 V,
Full range -3.0 +3.0
load, and full temperature range I
LOAD
= 1 mA to 50 mA
Initial output voltage accuracy V
IN
= 3 V 25°C 1.256 1.275 1.294
Adjustable V
OUT
V
Output voltage accuracy over line,
V
IN
= 4 V to 50 V, I
LOAD
= 1 mA to 50 mA Full range 1.237 1.275 1.313
load, and full temperature range
Line regulation, adjustable V
OUT
ΔV
IN
= 3 V to 50 V 13
ΔV
OUT
/ΔV
IN
Full range mV
Line regulation, TPS79850 V
IN
= V
OUT
nom + 0.5 V to 50 V 15
25°C 20
Load regulation, adjustable V
OUT
ΔI
LOAD
= 1 mA to 50 mA
Full range 32
ΔV
OUT
/ΔI
OUT
mV
25°C 50
Load regulation, fixed V
OUT
ΔI
LOAD
= 1 mA to 50 mA
Full range 90
Adjustable V
OUT
Output voltage range
(2) (3)
Full range 1.275 28 V
25°C 85 150 mV
V
IN
= V
OUT(NOM)
– 0.1 V
Full range 190 mV
25°C 170 260 mV
I
LOAD
= 10 mA,
V
DO
Dropout voltage
(4) (5)
V
IN
= V
OUT(NOM)
– 0.1 V
Full range 350 mV
25°C 300 370 mV
I
LOAD
= 50 mA,
V
IN
= V
OUT(NOM)
– 0.1 V
Full range 550 mV
I
LOAD
= 0 mA Full range 30 80 μA
I
LOAD
= 1 mA Full range 100 180 μA
I
GND
GND pin current
(6)
V
IN
= V
OUT(NOM)
I
LOAD
= 10 mA Full range 400 700 μA
I
LOAD
= 50 mA Full range 1.8 3.3 mA
C
OUT
= 10μF, I
LOAD
= 50 mA,
V
N
Output voltage noise BW = 10 Hz to 100 kHz, V
IN
= 4.3 V, 25°C 100 μV
RMS
V
OUT
= 3.3 V (adjustable used)
I
FB
FB pin bias current
(7)
V
IN
= 3.0 V 25°C 0.05 0.2 μA
EN pin high (enabled)
(8)
OFF to ON, V
IN
= 6.0 V Full range 1.5 V
V
EN
EN pin low (shutdown)
(8)
ON to OFF, V
IN
= 6.0 V 25°C 0.4 V V
EN pin low (shutdown)
(8)
ON to OFF, V
IN
= 6.0 V Full range 0.2 V V
V
EN
= 0 V V
IN
= 6.0 V, I
LOAD
= 0 mA Full range 0.4 2.0 μA
I
EN
EN pin current
(8)
V
EN
= 3 V, V
IN
= 6.0 V, I
LOAD
= 0 mA Full range 0.4 0.5 μA
I
shutdown
GND pin current
(6)
V
IN
= 6 V, V
EN
= 0 V, I
LOAD
= 0 mA Full range 3 25 μA
V
IN
= 4.3 V, V
OUT
3.3-V V
RIPPLE
= 0.5 V
PP
,
PSRR Power-supply rejection ratio 25°C 65 dB
f
RIPPLE
= 120 Hz, I
LOAD
= 50 mA
Fixed current limit
(9)
ΔV
OUT
= V
OUT(NOM)
– 0.1 V Full range 60 200 mA
I
LIMIT
Adjustable current limit ΔV
OUT
= V
OUT(NOM)
– 0.1 V Full range 60 200 mA
(1) Full range T
J
= –40°C to 125°C
(2) This parameter is tested and specified under pulse load conditions such that T
J
= T
A
. This device is 100% production tested at
T
A
= 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 T
J
= 125°C. The regulated output voltage specification cannot be applied to
all combinations of various V
IN
, V
OUT
, ambient temperature, and I
OUT
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 R
1
= 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 V
IN
= V
OUT(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 V
IN
= V
OUT(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 V
IN
= V
OUT(NOM)
+ 0.5 V or 3.0 V, whichever is greater. V
OUT
is forced to V
OUT(NOM)
– 0.1 V and the output
current is measured.
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