LT3071 Ver la hoja de datos (PDF) - Linear Technology
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componentes Descripción
Fabricante
LT3071
Linear Technology
LT3071 Datasheet PDF : 30 Pages
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LT3071
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. COUT = 15µF (Note 9), VIN = VOUT + 0.3V (Note 5), VBIAS = 2.5V unless
otherwise noted.
PARAMETER
VIZ Input Range (Logic-Z State),
VO2, VO1, VO0
VIH Input Threshold (Logic-1 State),
VO2, VO1, VO0
Input Hysteresis (Both Thresholds),
VO2, VO1, VO0
Input Current High,
VO2, VO1, VO0
Input Current Low,
VO2, VO1, VO0
EN Pin Threshold
EN Pin Logic High Current
EN Pin Logic Low Current
VBIAS Ripple Rejection
VIN Ripple Rejection
(Notes 3, 4, 5)
Reference Voltage Noise
(REF/BYP Pin)
Output Voltage Noise
CONDITIONS
Input Rising
VIH = VBIAS = 2.5V, Current Flows Into Pin
VIL = 0V, VBIAS = 2.5V, Current Flows Out of Pin
VOUT = Off to On, VBIAS = 2.5V
VOUT = On to Off, VBIAS = 2.5V
VOUT = Off to On, VBIAS = 2.2V to 3.6V
VOUT = On to Off, VBIAS = 2.2V to 3.6V
VEN = VBIAS = 2.5V
VEN = 0V
VBIAS = VOUT + 1.5VAVG, VRIPPLE =0.5VP-P , fRIPPLE = 120Hz,
VIN – VOUT = 300mV, IOUT = 2.5A
VBIAS = 2.5V, VRIPPLE = 50mVP-P , fRIPPLE = 120Hz,
VIN – VOUT = 300mV, IOUT = 2.5A
CREF/BYP = 10nF, BW = 10Hz to 100kHz
VOUT = 1V, IOUT = 5A, CREF/BYP = 10nF, COUT = 15µF,
BW = 10Hz to 100kHz
MIN
l 0.75
TYP MAX UNITS
VBIAS – 0.9
V
l VBIAS – 0.25
V
60
mV
l
25
40
µA
l
25
40
µA
l
l
0.9
l
l 0.36 • VBIAS
1.4
V
V
0.56 • VBIAS
V
V
l
2.5
4.0
6.5
µA
l
0.1
µA
75
dB
66
dB
10
µVRMS
25
µVRMS
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 TJ ≅ TA. The LT3071E is 100% tested at TA = 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 VOUT , the
BIAS voltage must satisfy the following conditions: 2.2V ≤ VBIAS ≤ 3.6V
and VBIAS ≥ (1.25 • VOUT + 1V). For VOUT ≤ 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
VIN < VOUT + 500mV.
Note 5: The LT3071 incorporates safe operating area protection circuitry.
Current limit decreases as the VIN-VOUT voltage increases. Current limit
foldback starts at VIN – VOUT > 500mV. See the Typical Performance
Characteristics for a graph of Current Limit vs VIN – VOUT voltage. The
current limit foldback feature is independent of the thermal shutdown
circuity.
Note 6: Dropout voltage, VDO, is the minimum input to output voltage
differential at a specified output current. In dropout, the output voltage
equals VIN – VDO.
Note 7: GND pin current is tested with VIN = VOUT(NOMINAL) + 300mV and a
current source load. VIOC is a buffered output determined by the value of
VOUT as programmed by the VO2-VO0 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 COUT 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.
3071fc
4
For more information www.linear.com/LT3071
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