Datasheet

LT3071
4
3071fc
For more information www.linear.com/LT3071
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. C
OUT
= 15µF (Note 9), V
IN
= V
OUT
+ 0.3V (Note 5), V
BIAS
= 2.5V unless
otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IZ
Input Range (Logic-Z State),
V
O2
, V
O1
, V
O0
l
0.75 V
BIAS
– 0.9 V
V
IH
Input Threshold (Logic-1 State),
V
O2
, V
O1
, V
O0
Input Rising
l
V
BIAS
– 0.25 V
Input Hysteresis (Both Thresholds),
V
O2
, V
O1
, V
O0
60 mV
Input Current High,
V
O2
, V
O1
, V
O0
V
IH
= V
BIAS
= 2.5V, Current Flows Into Pin
l
25 40 µA
Input Current Low,
V
O2
, V
O1
, V
O0
V
IL
= 0V, V
BIAS
= 2.5V, Current Flows Out of Pin
l
25 40 µA
EN Pin Threshold V
OUT
= Off to On, V
BIAS
= 2.5V
V
OUT
= On to Off, V
BIAS
= 2.5V
V
OUT
= Off to On, V
BIAS
= 2.2V to 3.6V
V
OUT
= On to Off, V
BIAS
= 2.2V to 3.6V
l
l
l
l
0.9
0.36 • V
BIAS
1.4
0.56 • V
BIAS
V
V
V
V
EN Pin Logic High Current V
EN
= V
BIAS
= 2.5V
l
2.5 4.0 6.5 µA
EN Pin Logic Low Current V
EN
= 0V
l
0.1 µA
V
BIAS
Ripple Rejection V
BIAS
= V
OUT
+ 1.5V
AVG
, V
RIPPLE
=0.5V
P-P
, f
RIPPLE
= 120Hz,
V
IN
– V
OUT
= 300mV, I
OUT
= 2.5A
75 dB
V
IN
Ripple Rejection
(Notes 3, 4, 5)
V
BIAS
= 2.5V, V
RIPPLE
= 50mV
P-P
, f
RIPPLE
= 120Hz,
V
IN
– V
OUT
= 300mV, I
OUT
= 2.5A
66 dB
Reference Voltage Noise
(REF/BYP Pin)
C
REF/BYP
= 10nF, BW = 10Hz to 100kHz 10 µV
RMS
Output Voltage Noise V
OUT
= 1V, I
OUT
= 5A, C
REF/BYP
= 10nF, C
OUT
= 15µF,
BW = 10Hz to 100kHz
25 µV
RMS
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LT3071 regulators are tested and specified under pulse load
conditions such that T
J
≅ T
A
. The LT3071E is 100% tested at T
A
= 25°C.
Performance at –40°C and 125°C is assured by design, characterization
and correlation with statistical process controls. The LT3071I is
guaranteed over the –40°C to 125°C operating junction temperature range.
The LT3071MP is 100% tested and guaranteed over the –55°C to 125°C
operating junction temperature range.
Note 3: To maintain proper performance and regulation, the BIAS supply
voltage must be higher than the IN supply voltage. For a given V
OUT
, the
BIAS voltage must satisfy the following conditions: 2.2V ≤ V
BIAS
≤ 3.6V
and V
BIAS
≥ (1.25 • V
OUT
+ 1V). For V
OUT
≤ 0.95V, the minimum BIAS
voltage is limited to 2.2V.
Note 4: Operating conditions are limited by maximum
junction
temperature. The regulated output voltage specification does not apply
for all possible combinations of input voltage and output current. When
operating at maximum output current, limit the input voltage range to
V
IN
< V
OUT
+ 500mV.
Note 5: The LT3071 incorporates safe operating area protection circuitry.
Current limit decreases as the V
IN
-V
OUT
voltage increases. Current limit
foldback starts at V
IN
– V
OUT
> 500mV. See the Typical Performance
Characteristics for a graph of Current Limit vs V
IN
– V
OUT
voltage. The
current limit foldback feature is independent of the thermal shutdown
circuity.
Note 6: Dropout voltage, V
DO
, is the minimum input to output voltage
differential at a specified output current. In dropout, the output voltage
equals V
IN
– V
DO
.
Note 7: GND pin current is tested with V
IN
= V
OUT(NOMINAL)
+ 300mV and a
current source load. VIOC is a buffered output determined by the value of
V
OUT
as programmed by the V
O2
-V
O0
pins. VIOC’s output is independent
of the margining function.
Note 8: Reverse output current is tested with the IN pins grounded and the
OUT + SENSE pins forced to the rated output voltage. This is measured as
current into the OUT + SENSE pins
.
Note 9:
Frequency Compensation: The LT3071 must be frequency
compensated at its OUT pins with a minimum C
OUT
of 15µF configured
as a cluster of (15×) 1µF ceramic capacitors or as a graduated cluster
of 10µF/4.7µF/2.2µF ceramic capacitors of the same case size. Linear
Technology only recommends X5R or X7R dielectric capacitors.
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