LT3071E/LT3071I .............................. –40°C to 125°C
LT3071MP ......................................... –55°C to 125°C
Storage Temperature Range .................. –65°C to 150°C
UFD PACKAGE
28-LEAD (4mm
×
5mm) PLASTIC QFN
T
JMAX
= 125°C,
θ
JA
= 30°C/W TO 35°C/W
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LT3071EUFD#PBF
LT3071IUFD#PBF
LT3071MPUFD#PBF
LEAD BASED FINISH
LT3071EUFD
LT3071IUFD
LT3071MPUFD
TAPE AND REEL
LT3071EUFD#TRPBF
LT3071IUFD#TRPBF
LT3071MPUFD#TRPBF
TAPE AND REEL
LT3071EUFD#TR
LT3071IUFD#TR
LT3071MPUFD#TR
PART MARKING*
3071
3071
3071
PART MARKING*
3071
3071
3071
PACKAGE DESCRIPTION
28-Lead (4mm × 5mm) Plastic QFN
28-Lead (4mm × 5mm) Plastic QFN
28-Lead (4mm × 5mm) Plastic QFN
PACKAGE DESCRIPTION
28-Lead (4mm × 5mm) Plastic QFN
28-Lead (4mm × 5mm) Plastic QFN
28-Lead (4mm × 5mm) Plastic QFN
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS
PARAMETER
IN Pin Voltage Range
BIAS Pin Voltage Range (Note 3)
Regulated Output Voltage
CONDITIONS
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.
MIN
l
l
TYP
MAX
3.0
3.6
UNITS
V
V
V
V
V
V
V
V
V
3071fc
V
IN
≥ V
OUT
+ 150mV, I
OUT
= 5A
V
OUT
= 0.8V, 10mA ≤ I
OUT
≤ 5A, 1.05V ≤ V
IN
≤ 1.25V
V
OUT
= 0.9V, 10mA ≤ I
OUT
≤ 5A, 1.15V ≤ V
IN
≤ 1.35V
V
OUT
= 1V, 10mA ≤ I
OUT
≤ 5A, 1.25V ≤ V
IN
≤ 1.45V
V
OUT
= 1.1V, 10mA ≤ I
OUT
≤ 5A, 1.35V ≤ V
IN
≤ 1.55V
V
OUT
= 1.2V, 10mA ≤ I
OUT
≤ 5A, 1.45V ≤ V
IN
≤ 1.65V, V
BIAS
= 3.3V
V
OUT
= 1.5V, 10mA ≤ I
OUT
≤ 5A, 1.75V ≤ V
IN
≤ 1.95V, V
BIAS
= 3.3V
V
OUT
= 1.8V, 10mA ≤ I
OUT
≤ 5A, 2.05V ≤ V
IN
≤ 2.25V, V
BIAS
= 3.3V
0.95
2.2
0.792
0.891
0.990
1.089
1.188
1.485
1.782
0.800
0.900
1.000
1.100
1.200
1.500
1.800
l
l
l
l
l
l
l
0.808
0.909
1.010
1.111
1.212
1.515
1.818
2
For more information
www.linear.com/LT3071
LT3071
ELECTRICAL CHARACTERISTICS
PARAMETER
Regulated Output Voltage Margining
(Note 3)
Line Regulation to V
IN
Line Regulation to V
BIAS
Load Regulation,
∆I
OUT
= 10mA to 5A
CONDITIONS
MARGA = 1.2V
MARGA = 0V
V
OUT
= 0.8V,
∆V
IN
= 1.05V to 2.7V, V
BIAS
= 3.3V, I
OUT
= 10mA
V
OUT
= 1.8V, ∆V
IN
= 2.05V to 2.7V, V
BIAS
= 3.3V, I
OUT
= 10mA
V
OUT
= 0.8V, ∆V
BIAS
= 2.2V to 3.6V, V
IN
= 1.1V, I
OUT
= 10mA
V
OUT
= 1.8V, ∆V
BIAS
= 3.25V to 3.6V, V
IN
= 2.1V, I
OUT
= 10mA
V
BIAS
= 2.5V, V
IN
= 1.05V, V
OUT
= 0.8V
l
l
l
l
l
l
l
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.
MIN
9.5
–10.5
TYP
10
–10
MAX
10.5
–9.5
1.0
1.0
2.0
1.0
–1.5
–2
l
UNITS
%
%
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
µA
µA
mA
mA
µA
mA
mA
mA
mA
mA
mA
A
A
A
mA
µA/A
µA
%
%
mV
V
V
mV
µA
µA
V
–3.0
–5.5
–4.0
–7.5
–4.0
–7.5
–5.0
–9.0
–7.0
–13
35
65
85
120
150
65
400
1.8
2.3
320
1.5
2.4
4.0
5.0
7.0
10.0
7.7
5.8
4.3
2.4
460
450
93
88
150
2.1
1.7
350
310
340
0.25
V
BIAS
= 2.5V, V
IN
= 1.25V, V
OUT
= 1.0V
V
BIAS
= 3.3V, V
IN
= 1.45V, V
OUT
= 1.2V
l
–2
–2.5
l
V
BIAS
= 3.3V, V
IN
= 1.75V, V
OUT
= 1.5V
V
BIAS
= 3.3V, V
IN
= 2.05V, V
OUT
= 1.8V
l
–3
l
l
Dropout Voltage,
V
IN
= V
OUT(NOMINAL)
(Note 6)
I
OUT
= 1A, V
OUT
= 1V
I
OUT
= 2.5A, V
OUT
= 1V
I
OUT
= 5A, V
OUT
= 1V
20
50
85
l
SENSE Pin Current
Ground Pin Current,
V
IN
= 1.3V, V
OUT
= 1V
BIAS Pin Current in Nap Mode
BIAS Pin Current,
V
IN
= 1.3V, V
OUT
= 1V
V
IN
= 1.1V, V
SENSE
= 0.8V
V
BIAS
= 3.3V, V
IN
= 2.1V, V
SENSE
= 1.8V
I
OUT
= 10mA
I
OUT
= 5A
EN = Low
I
OUT
= 10mA
I
OUT
= 100mA
I
OUT
= 500mA
I
OUT
= 1A
I
OUT
= 2.5A
I
OUT
= 5A
V
IN
– V
OUT
< 0.3V, V
BIAS
= 3.3V
V
IN
– V
OUT
= 1.0V, V
BIAS
= 3.3V
V
IN
– V
OUT
= 1.7V, V
BIAS
= 3.3V
1A ≤ I
OUT
≤ 5A, V
IN
– V
OUT
= 0.3V, V
OUT
= 0.8V, 1.8V
V
IN
= 0V, V
OUT
= 1.8V
Percentage of V
OUT(NOMINAL)
, V
OUT
Rising
Percentage of V
OUT(NOMINAL)
, V
OUT
Falling
I
PWRGD
= 200µA (Fault Condition)
V
BIAS
Rising
V
BIAS
Falling
V
IN
= V
OUT(NOMINAL)
+ 150mV, Sourcing Out of the Pin
V
IN
= V
OUT(NOMINAL)
+ 450mV, Sinking Into the Pin
Input Falling
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
35
200
0.65
0.9
120
0.75
1.25
2.0
2.6
3.5
4.5
5.1
3.2
1.2
1.6
340
87
82
1.1
0.9
250
160
170
50
300
1.1
1.35
200
1.08
1.8
3.0
3.8
5.2
6.9
6.4
4.5
2.5
2.0
400
300
90
85
50
1.55
1.4
300
235
255
Current Limit (Note 5)
I
MON
Full-Scale Output Current (Note 3) I
OUT
= 5A, V
IN
– V
OUT
= 0.3V, V
OUT
= 0.8V, 1.8V
I
MON
/I
OUT
Scale (Note 3)
Reverse Output Current (Note 8)
PWRGD V
OUT
Threshold
PWRGD V
OL
V
BIAS
Undervoltage Lockout
V
IN
-V
OUT
Servo Voltage by VIOC
VIOC Output Current
V
IL
Input Threshold (Logic-0 State),
V
O2
, V
O1
, V
O0
3071fc
For more information
www.linear.com/LT3071
3
LT3071
ELECTRICAL CHARACTERISTICS
PARAMETER
V
IZ
Input Range (Logic-Z State),
V
O2
, V
O1
, V
O0
V
IH
Input Threshold (Logic-1 State),
V
O2
, V
O1
, V
O0
Input Hysteresis (Both Thresholds),
V
O2
, V
O1
, V
O0
Input Current High,
V
O2
, V
O1
, V
O0
Input Current Low,
V
O2
, V
O1
, V
O0
EN Pin Threshold
V
IH
= V
BIAS
= 2.5V, Current Flows Into Pin
V
IL
= 0V, V
BIAS
= 2.5V, Current Flows Out of Pin
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
V
EN
= V
BIAS
= 2.5V
V
EN
= 0V
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
V
BIAS
= 2.5V, V
RIPPLE
= 50mV
P-P
, f
RIPPLE
= 120Hz,
V
IN
– V
OUT
= 300mV, I
OUT
= 2.5A
C
REF/BYP
= 10nF, BW = 10Hz to 100kHz
V
OUT
= 1V, I
OUT
= 5A, C
REF/BYP
= 10nF, C
OUT
= 15µF,
BW = 10Hz to 100kHz
l
l
l
l
0.9
l
l
0.36 • V
BIAS
l
l
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.
CONDITIONS
l
MIN
0.75
V
BIAS
– 0.25
TYP
MAX
V
BIAS
– 0.9
UNITS
V
V
Input Rising
l
60
25
25
40
40
1.4
0.56 • V
BIAS
4.0
75
66
10
25
6.5
0.1
mV
µA
µA
V
V
V
V
µA
µA
dB
dB
µV
RMS
µV
RMS
EN Pin Logic High Current
EN Pin Logic Low Current
V
BIAS
Ripple Rejection
V
IN
Ripple Rejection
(Notes 3, 4, 5)
Reference Voltage Noise
(REF/BYP Pin)
Output Voltage Noise
2.5
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.
1. Introduction
Electronic scales are gradually replacing traditional measuring tools like springs and balances in everyday life, such as electronic price computing scales and electronic weigh...[详细]
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