1764 is a low dropout regulator optimized for fast
transient response. The device is capable of supplying 3A
of output current with a dropout voltage of 340mV. Operating quiescent current is 1mA, dropping to <1µA in
shutdown. Quiescent current is well controlled; it does not
rise in dropout as it does with many other regulators. In
addition to fast transient response, the LT1764 has very
low output voltage noise which makes the device ideal for
sensitive RF supply applications.
Output voltage range is from 1.21V to 20V. The LT1764
regulators are stable with output capacitors as low as 10µF.
Internal protection circuitry includes reverse battery protection, current limiting, thermal limiting and reverse current protection. The device is available in fixed output
voltages of 1.5V, 1.8V, 2.5V, 3.3V and as an adjustable
device with a 1.21V reference voltage. The LT1764 regulators are available in 5-lead TO-220, DD and Exposed Pad
16-lead TSSOP packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Protected by U.S. Patents,
including 6144250, 6118263.
TYPICAL APPLICATIO
to 2.5V
3.3V
IN
IN
> 3V
V
IN
10µF
LT1764-2.5
SHDN
OUT
SENSE
GND
Regulator
OUT
U
Dropout Voltage
400
350
300
2.5V
++
3A
10µF
1764 TA01
250
200
150
100
DROPOUT VOLTAGE (mV)
50
0
00.5
1.02.01.5
LOAD CURRENT (A)
2.5
3.0
1764 TA02
1764fb
1
LT1764 Series
FE PACKAGE
16-LEAD PLASTIC TSSOP
EXPOSED PAD (PIN 17) IS GND. MUST BE
SOLDERED TO THE PCB.
1
2
3
4
5
6
7
8
TOP VIEW
16
15
14
13
12
11
10
9
GND
NC
OUT
OUT
OUT
SENSE/ADJ*
GND
GND
GND
NC
IN
IN
IN
NC
SHDN
GND
17
WW
W
ABSOLUTE MAXIMUM RATINGS
U
(Note 1)
IN Pin Voltage ........................................................ ±20V
OUT Pin Voltage .................................................... ±20V
Input to Output Differential Voltage (Note 12) ....... ±20V
SENSE Pin Voltage ............................................... ±20V
ADJ Pin Voltage ...................................................... ±7V
U
W
PACKAGE/ORDER INFORMATION
FRONT VIEW
SENSE/ADJ*
5
OUT
TAB IS
GND
*PIN 5 = SENSE FOR LT1764-1.5/LT1764-1.8/
LT1764-2.5/LT1764-3.3
= ADJ FOR LT1764
T
JMAX
4
3
2
1
Q PACKAGE
5-LEAD PLASTIC DD
= 150°C, θJA = 30°C/ W
GND
IN
SHDN
TAB IS
GND
*PIN 5 = SENSE FOR LT1764-1.5/LT1764-1.8/
FRONT VIEW
T PACKAGE
5-LEAD PLASTIC TO-220
LT1764-2.5/LT1764-3.3
= ADJ FOR LT1764
= 150°C, θJA = 50°C/ W
T
JMAX
SHDN Pin Voltage ................................................. ±20V
= 1mA to 3A37mV
= 1mA to 3A, –40°C ≤ TJ ≤ 110°C23mV
= 1mA to 2.7A, 110°C < TJ ≤ 125°C23mV
= 1mA to 3A48mV
= 1mA to 3A, –40°C ≤ TJ ≤ 110°C25mV
= 1mA to 2.7A, 110°C < TJ ≤ 125°C25mV
= 1mA to 3A410mV
= 1mA to 3A, –40°C ≤ TJ ≤ 110°C30mV
= 1mA to 2.7A, 110°C < TJ ≤ 125°C30mV
= 1mA to 3A412mV
= 1mA to 3A, –40°C ≤ TJ ≤ 110°C40mV
= 1mA to 2.7A, 110°C < TJ ≤ 125°C40mV
= 1mA to 3A25mV
= 1mA to 3A, –40°C ≤ TJ ≤ 110°C20mV
= 1mA to 2.7A, 110°C < TJ ≤ 125°C20mV
●
●
●
●
0.10V
0.18V
0.27V
0.40V
1764fb
3
LT1764 Series
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. (Note 2)
PARAMETERCONDITIONSMINTYPMAXUNITS
GND Pin CurrentI
= V
V
IN
OUT(NOMINAL)
+ 1VI
(Notes 5, 7)I
Output Voltage NoiseC
ADJ Pin Bias Current(Notes 3, 8)310µA
Shutdown ThresholdV
SHDN Pin CurrentV
(Note 9)V
Quiescent Current in ShutdownVIN = 6V, V
Ripple RejectionVIN – V
Current LimitVIN = 7V, V
Input Reverse Leakage CurrentVIN = –20V, V
Reverse Output Current (Note 10) LT1764-1.5 V
= 0mA
LOAD
= 1mA
LOAD
= 100mA
LOAD
I
= 500mA
LOAD
= 1.5A
I
LOAD
= 2.7A, 110°C < TJ ≤ 125°C120200mA
I
LOAD
I
= 3A, –40°C ≤ TJ ≤ 110°C120200mA
LOAD
= 10µF, I
OUT
= Off to On
OUT
= On to Off
V
OUT
= 0V0.011µA
SHDN
= 20V730µA
SHDN
OUT
= 120Hz, I
f
RIPPLE
= 3A, BW = 10Hz to 100kHz40µV
LOAD
= 0V0.011µA
SHDN
= 1.5V (Avg), V
= 1.5A
LOAD
= 0V4A
OUT
RIPPLE
= 0.5V
,5563dB
P-P
●
●
●
●
●
●
●
0.250.75V
11.5mA
1.11.6mA
3.55mA
1118mA
4075mA
0.92V
LT1764-1.8, LT1764-2.5, LT1764-3.3
= V
V
IN
= V
V
IN
OUT(NOMINAL)
OUT(NOMINAL)
+ 1V, ∆V
+ 1V, ∆V
= – 0.1V, –40°C ≤ TJ ≤ 110°C3.1A
OUT
= – 0.1V, 110°C < TJ ≤ 125°C2.8A
OUT
LT1764, LT1764-1.5
= 2.7V, ∆V
V
IN
V
= 2.7V, ∆V
IN
LT1764-1.8 V
LT1764-2.5 V
LT1764-3.3 V
LT1764 (Note 3) V
= – 0.1V, –40°C ≤ TJ ≤ 110°C3.1A
OUT
= – 0.1V, 110°C < TJ ≤ 125°C2.8A
OUT
= 0V
OUT
= 1.5V, VIN < 1.5V6001200µA
OUT
= 1.8V, VIN < 1.8V6001200µA
OUT
= 2.5V, VIN < 2.5V6001200µA
OUT
= 3.3V, VIN < 3.3V6001200µA
OUT
= 1.21V, VIN < 1.21V300600µA
OUT
●
1mA
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 LT1764 regulators are tested and specified under pulse load
conditions such that T
≈ TA. The LT1764 is 100% tested at TA = 25°C.
J
Performance at –40°C and 125°C is assured by design, characterization
and correlation with statistical process controls.
Note 3: The LT1764 (adjustable version) is tested and specified for these
conditions with the ADJ pin connected to the OUT pin.
Note 4. Operating conditions are limited by maximum junction
temperature. The regulated output voltage specification will not apply for
all possible combinations of input voltage and output current. When
operating at maximum input voltage, the output current range must be
limited. When operating at maximum output current, the input voltage
range must be limited.
Note 5: To satisfy requirements for minimum input voltage, the LT1764
(adjustable version) is tested and specified for these conditions with an
external resistor divider (two 4.12k resistors) for an output voltage of 2.42V.
The external resistor divider will add a 300µA DC load on the output.
4
Note 6: Dropout voltage is the minimum input to output voltage differential
needed to maintain regulation at a specified output current. In dropout, the
output voltage will be equal to: V
Note 7: GND pin current is tested with V
V
= 2.7V (whichever is greater) and a current source load. The GND pin
IN
IN
– V
DROPOUT
= V
IN
.
OUT(NOMINAL)
+ 1V or
current will decrease at higher input voltages.
Note 8: ADJ pin bias current flows into the ADJ pin.
Note 9: SHDN pin current flows into the SHDN pin.
Note 10: Reverse output current is tested with the IN pin grounded and the
OUT pin forced to the rated output voltage. This current flows into the OUT
pin and out the GND pin.
Note 11. For the LT1764, LT1764-1.5 and LT1764-1.8 dropout voltage will
be limited by the minimum input voltage specification under some output
voltage/load conditions.
Note 12. All combinations of absolute maximum input voltage and
absolute maximum output voltage cannot be achieved. The absolute
maximum differential from input to output is ±20V. For example, with
V
= 20V, V
IN
cannot be pulled below ground.
OUT
1764fb
TEMPERATURE (°C)
–50
OUTPUT VOLTAGE (V)
25
1756 G06
–25050
2.58
2.56
2.54
2.52
2.50
2.48
2.46
2.44
2.42
75 100 125
IL = 1mA
TEMPERATURE (°C)
–50
DROPOUT VOLTAGE (mV)
400
500
600
2575
1764 G03
300
200
–250
50100 125
100
0
IL = 3A
IL = 1.5A
IL = 0.5A
IL = 100mA
IL = 1mA
UW
TYPICAL PERFOR A CE CHARACTERISTICS
Typical Dropout VoltageGuaranteed Dropout VoltageDropout Voltage
600
500
700
600
= TEST POINTS
LT1764 Series
400
300
200
DROPOUT VOLTAGE (mV)
100
0
0
TJ = 125°C
1.01.52.0
0.5
OUTPUT CURRENT (A)
TJ = 25°C
2.53.0
1764 G01
500
400
300
200
100
GUARANTEED DROPOUT VOLTAGE (mV)
0
0
TJ ≤ 125°C
TJ ≤ 25°C
0.51.0
OUTPUT CURRENT (A)
2.03.0
1.52.5
1764 G02
Quiescent CurrentLT1764-1.8 Output VoltageLT1764-2.5 Output Voltage
1.4
LT1764-1.8/2.5/3.3
1.2
1.0
0.8
0.6
0.4
VIN = 6V
QUIESCENT CURRENT (mA)
0.2
0
–50
=
R
L
IL = 0
V
SHDN
–250
∞
= V
IN
TEMPERATURE (°C)
LT1764
50100 125
2575
1764 G04
1.84
IL = 1mA
1.83
1.82
1.81
1.80
1.79
OUTPUT VOLTAGE (V)
1.78
1.77
1.76
–25050
–50
25
TEMPERATURE (°C)
75 100 125
1756 G05
LT1764-3.3 Output VoltageLT1764 ADJ Pin VoltageLT1764-1.8 Quiescent Current
3.38
IL = 1mA
3.36
3.34
3.32
3.30
3.28
OUTPUT VOLTAGE (V)
3.26
3.24
3.22
–50
–25050
25
TEMPERATURE (°C)
75 100 125
1756 G07
1.230
IL = 1mA
1.225
1.220
1.215
1.210
1.205
ADJ PIN VOLTAGE (V)
1.200
1.195
1.190
–25050
–50
25
TEMPERATURE (°C)
75 100 125
1756 G08
40
TJ = 25°C
=
∞
R
35
L
V
= V
SHDN
30
25
20
15
10
QUIESCENT CURRENT (mA)
5
0
0
IN
246 1071359
INPUT VOLTAGE (V)
8
1764 G09
1764fb
5
LT1764 Series
UW
TYPICAL PERFOR A CE CHARACTERISTICS
LT1764-2.5 Quiescent CurrentLT1764-3.3 Quiescent CurrentLT1764 Quiescent Current
40
TJ = 25°C
=
∞
R
35
L
V
= V
SHDN
IN
30
25
20
15
10
QUIESCENT CURRENT (mA)
5
0
246 1071359
0
8
INPUT VOLTAGE (V)
1764 G10
LT1764-1.8 GND Pin CurrentLT1764-2.5 GND Pin CurrentLT1764-3.3 GND Pin Current
20.0
17.5
15.0
12.5
RL = 3.6Ω
I
= 500mA*
L
10.0
7.5
GND PIN CURRENT (mA)
5.0
2.5
0
RL = 18Ω
= 100mA*
I
L
3578246 10
10
INPUT VOLTAGE (V)
TJ = 25°C
= V
V
SHDN
*FOR V
RL = 6Ω
= 300mA*
I
L
OUT
IN
= 1.8V
9
1764 G13
40
35
30
25
20
15
10
QUIESCENT CURRENT (mA)
5
0
246 1071359
0
INPUT VOLTAGE (V)
40
35
30
25
RL = 5Ω
= 500mA*
I
L
20
15
GND PIN CURRENT (mA)
10
5
0
3578246 10
10
INPUT VOLTAGE (V)
RL = 25Ω
= 100mA*
I
L
= 25°C
T
J
V
SHDN
*FOR V
TJ = 25°C
=
∞
R
L
V
= V
SHDN
8
1764 G11
= V
IN
= 2.5V
OUT
RL = 8.33Ω
= 300mA*
I
L
9
1764 G14
1.6
TJ = 25°C
= 4.3k
R
1.4
L
= V
IN
V
SHDN
IN
1.2
1.0
0.8
0.6
0.4
QUIESCENT CURRENT (mA)
0.2
0
48122014261018
0
INPUT VOLTAGE (V)
80
70
60
50
40
RL = 6.6Ω
= 500mA*
I
L
30
GND PIN CURRENT (mA)
20
10
0
3578246 10
10
INPUT VOLTAGE (V)
TJ = 25°C
V
SHDN
*FOR V
RL = 11Ω
= 300mA*
I
L
16
= V
IN
= 3.3V
OUT
RL = 33Ω
= 100mA*
I
L
1764 G12
9
1764 G15
LT1764 GND Pin CurrentLT1764-1.8 GND Pin CurrentLT1764-2.5 GND Pin Current
15
TJ = 25°C
= V
V
SHDN
IN
*FOR V
12
OUT
= 1.21V
9
6
RL = 12.1Ω
= 100mA*
I
GND PIN CURRENT (mA)
3
0
0
L
2
3
19
INPUT VOLTAGE (V)
RL = 4.33Ω
= 300mA*
I
L
4
5
RL = 2.42Ω
= 500mA*
I
L
6
7
150
120
RL = 0.6Ω
= 3A*
90
60
GND PIN CURRENT (mA)
30
8
10
0
0
I
L
RL = 1.2Ω
I
2
3
19
= 1.5A*
L
4
5
TJ = 25°C
= V
V
SHDN
*FOR V
RL = 2.57Ω
I
L
6
7
IN
= 1.8V
OUT
= 0.7A*
8
10
INPUT VOLTAGE (V)
1764 G16
1764 G17
200
160
120
80
RL = 1.66Ω
= 1.5A*
GND PIN CURRENT (mA)
40
0
19
0
I
L
2
3
4
INPUT VOLTAGE (V)
6
TJ = 25°C
V
SHDN
*FOR V
RL = 0.83Ω
= 3A*
I
L
6
5
= V
IN
= 2.5V
OUT
RL = 3.57Ω
= 0.7A*
I
L
7
8
10
1764 G18
1764fb
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