LINEAR TECHNOLOGY LT1764 Technical data

查询LT1764-1.5供应商

FEATURES

■

Optimized for Fast Transient Response

■

Output Current: 3A

■

Dropout Voltage: 340mV at 3A

■

Low Noise: 40µV

■

1mA Quiescent Current

■

Wide Input Voltage Range: 2.7V to 20V

■

No Protection Diodes Needed

■

Controlled Quiescent Current in Dropout

■

Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 3.3V

■

Adjustable Output from 1.21V to 20V

■

<1µA Quiescent Current in Shutdown

■

Stable with 10µF Output Capacitor

■

Reverse Battery Protection

■

No Reverse Current

■

Thermal Limiting

(10Hz to 100kHz)

RMS

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APPLICATIO S

■

3.3V to 2.5V Logic Power Supply

■

Post Regulator for Switching Supplies

LT1764 Series

3A, Fast Transient

Response, Low Noise,

LDO Regulators

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DESCRIPTIO

The LT®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 and DD packages.

, LTC and LT are registered trademarks of Linear Technology Corporation.

TYPICAL APPLICATIO

3.3VIN to 2.5V

IN

V

> 3V

IN

10µF

LT1764-2.5

SHDN

OUT

SENSE

GND

Regulator

OUT

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Dropout Voltage

400

350

300

2.5V

++

3A

10µF

1764 TA01

250

200

150

100

DROPOUT VOLTAGE (mV)

50

0

0 0.5

1.0 2.01.5

LOAD CURRENT (A)

2.5

3.0

1764 TA02

1764fa

1

LT1764 Series

WW

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ABSOLUTE MAXIMUM RATINGS

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(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

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PACKAGE/ORDER INFORMATION

FRONT VIEW

TAB IS

GND

Q PACKAGE

5-LEAD PLASTIC DD

*PIN 5 = SENSE FOR LT1764-1.8/

LT1764-2.5/LT1764-3.3

= ADJ FOR LT1764

T

= 150°C, θJA = 30°C/ W

JMAX

5
4
3
2
1

SENSE/ADJ*
OUT
GND
IN
SHDN

ORDER PART

NUMBER

LT1764EQ
LT1764EQ-1.5
LT1764EQ-1.8
LT1764EQ-2.5
LT1764EQ-3.3

SHDN Pin Voltage................................................. ±20V

Output Short-Circuit Duration......................... Indefinite

Operating Junction Temperature Range –40°C to 125°C

Storage Temperature Range ................. –65°C to 150°C

Lead Temperature (Soldering, 10 sec)..................300°C

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TAB IS

GND

FRONT VIEW

5
4
3
2
1

T PACKAGE

5-LEAD PLASTIC TO-220

*PIN 5 = SENSE FOR LT1764-1.8/

LT1764-2.5/LT1764-3.3

= ADJ FOR LT1764

= 150°C, θJA = 50°C/W

T

JMAX

SENSE/ADJ*
OUT
GND
IN
SHDN

ORDER PART

NUMBER

LT1764ET
LT1764ET-1.5
LT1764ET-1.8
LT1764ET-2.5
LT1764ET-3.3

Consult LTC Marketing for parts specified with wider operating temperature ranges.

ELECTRICAL CHARACTERISTICS

The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. (Note 2)

PARAMETER CONDITIONS MIN TYP MAX UNITS

Minimum Input Voltage I
(Notes 3, 11) I

Regulated Output Voltage LT1764-1.5 VIN = 2.21V, I
(Note 4) 2.7V < V

ADJ Pin Voltage LT1764 VIN = 2.21V, I
(Notes 3, 4) 2.7V < V

= 0.5A 1.7 V

LOAD

= 1.5A 1.9 V

LOAD

= 2.7A, 110°C < TJ ≤ 125°C 2.3 2.7 V

I

LOAD

I

= 3A, –40°C ≤ TJ ≤ 110°C 2.3 2.7 V

LOAD

= 1mA 1.477 1.500 1.523 V

LOAD

IN

2.7V < V

IN

LT1764-1.8 VIN = 2.3V, I

2.8V < V

IN

2.8V < V

IN

LT1764-2.5 VIN = 3V, I

3.5V < V

IN

3.5V < V

IN

LT1764-3.3 VIN = 3.8V, I

4.3V < V

IN

4.3V < V

IN

IN

2.7V < V

IN

< 20V, 1mA < I
< 20V, 1mA < I

= 1mA 1.773 1.800 1.827 V

LOAD

< 20V, 1mA < I
< 20V, 1mA < I

= 1mA 2.462 2.500 2.538 V

LOAD

< 20V, 1mA < I
< 20V, 1mA < I

= 1mA 3.250 3.300 3.350 V

LOAD

< 20V, 1mA < I
< 20V, 1mA < I

= 1mA 1.192 1.210 1.228 V

LOAD

< 20V, 1mA < I
< 20V, 1mA < I

< 3A, –40°C ≤ TJ ≤ 110°C 1.447 1.500 1.545 V

LOAD

< 2.7A, 110°C < TJ ≤ 125°C 1.447 1.500 1.545 V

LOAD

< 3A, –40°C ≤ TJ ≤ 110°C 1.737 1.800 1.854 V

LOAD

< 2.7A, 110°C < TJ ≤ 125°C 1.737 1.800 1.854 V

LOAD

< 3A, –40°C ≤ TJ ≤ 110°C 2.412 2.500 2.575 V

LOAD

< 2.7A, 110°C < TJ ≤ 125°C 2.412 2.500 2.575 V

LOAD

< 3A, –40°C ≤ TJ ≤ 110°C 3.183 3.300 3.400 V

LOAD

< 2.7A, 110°C < TJ ≤ 125°C 3.183 3.300 3.400 V

LOAD

< 3A, –40°C ≤ TJ ≤ 110°C 1.168 1.210 1.246 V

LOAD

< 2.7A, 110°C < TJ ≤ 125°C 1.168 1.210 1.246 V

LOAD

2

1764fa

LT1764 Series

ELECTRICAL CHARACTERISTICS

The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. (Note 2)

PARAMETER CONDITIONS MIN TYP MAX UNITS

Line Regulation LT1764-1.5 ∆VIN = 2.21V to 20V, I

LT1764-1.8 ∆V
LT1764-2.5 ∆V
LT1764-3.3 ∆V
LT1764 (Note 3) ∆V

Load Regulation LT1764-1.5 VIN = 2.7V, ∆I

LT1764-1.8 VIN = 2.8V, ∆I

LT1764-2.5 VIN = 3.5V, ∆I

LT1764-3.3 VIN = 4.3V, ∆I

LT1764 (Note 3) VIN = 2.7V, ∆I

Dropout Voltage I
V

= V

IN

OUT(NOMINAL)

(Notes 5, 6, 11) I

GND Pin Current I

= V

V

IN

OUT(NOMINAL)

+ 1V I

(Notes 5, 7) I

Output Voltage Noise C

= 1mA 0.02 0.05 V

LOAD

I

= 1mA ● 0.10 V

LOAD

= 100mA 0.07 0.13 V

LOAD

= 100mA ● 0.18 V

I

LOAD

I

= 500mA 0.14 0.20 V

LOAD

= 500mA ● 0.27 V

I

LOAD

I

= 1.5A 0.25 0.33 V

LOAD

I

= 1.5A ● 0.40 V

LOAD

I

= 2.7A, 110°C < TJ ≤ 125°C 0.66 V

LOAD

I

= 3A 0.34 0.45 V

LOAD

I

= 3A, –40°C ≤ TJ ≤ 110°C 0.66 V

LOAD

= 0mA ● 1 1.5 mA

LOAD

= 1mA ● 1.1 1.6 mA

LOAD

= 100mA ● 3.5 5 mA

LOAD

I

= 500mA ● 11 18 mA

LOAD

= 1.5A ● 40 75 mA

I

LOAD

= 2.7A, 110°C < TJ ≤ 125°C 120 200 mA

I

LOAD

I

= 3A, –40°C ≤ TJ ≤ 110°C 120 200 mA

LOAD

= 10µF, I

OUT

LOAD

= 2.3V to 20V, I

IN

= 3V to 20V, I

IN

= 3.8V to 20V, I

IN

= 2.21V to 20V, I

IN

= 2.7V, ∆I

V

IN

= 2.7V, ∆I

V

IN

= 2.8V, ∆I

V

IN

V

= 2.8V, ∆I

IN

= 3.5V, ∆I

V

IN

= 3.5V, ∆I

V

IN

V

= 4.3V, ∆I

IN

= 4.3V, ∆I

V

IN

= 2.7V, ∆I

V

IN

V

= 2.7V, ∆I

IN

LOAD
LOAD
LOAD

LOAD
LOAD
LOAD

LOAD
LOAD
LOAD

LOAD
LOAD
LOAD

LOAD
LOAD
LOAD

= 3A, BW = 10Hz to 100kHz 40 µV

ADJ Pin Bias Current (Notes 3, 8) 310µA
Shutdown Threshold V

SHDN Pin Current V
(Note 9) V

Quiescent Current in Shutdown VIN = 6V, V
Ripple Rejection VIN – V

= Off to On ● 0.9 2 V

OUT

V

= On to Off ● 0.25 0.75 V

OUT

= 0V 0.01 1 µA

SHDN

= 20V 730µA

SHDN

= 0V 0.01 1 µA

SHDN

f

RIPPLE

= 1.5V (Avg), V

OUT

= 120Hz, I

LOAD

= 1.5A

RIPPLE

= 0.5V

= 1mA ● 2.5 10 mV

LOAD

= 1mA ● 310mV

LOAD

= 1mA ● 410mV

LOAD

= 1mA ● 4.5 10 mV

LOAD

= 1mA ● 210mV

LOAD

= 1mA to 3A 3 7 mV
= 1mA to 3A, –40°C ≤ TJ ≤ 110°C23mV
= 1mA to 2.7A, 110°C < TJ ≤ 125°C23mV

= 1mA to 3A 4 8 mV
= 1mA to 3A, –40°C ≤ TJ ≤ 110°C25mV
= 1mA to 2.7A, 110°C < TJ ≤ 125°C25mV

= 1mA to 3A 4 10 mV
= 1mA to 3A, –40°C ≤ TJ ≤ 110°C30mV
= 1mA to 2.7A, 110°C < TJ ≤ 125°C30mV

= 1mA to 3A 4 12 mV
= 1mA to 3A, –40°C ≤ TJ ≤ 110°C40mV
= 1mA to 2.7A, 110°C < TJ ≤ 125°C40mV

= 1mA to 3A 2 5 mV
= 1mA to 3A, –40°C ≤ TJ ≤ 110°C20mV
= 1mA to 2.7A, 110°C < TJ ≤ 125°C20mV

RMS

,5563dB

P-P

1764fa

3

LT1764 Series

TEMPERATURE (°C)

–50

DROPOUT VOLTAGE (mV)

400

500

600

25 75

1764 G03

300

200

–25 0

50 100 125

100

0

IL = 3A

IL = 1.5A

IL = 0.5A

IL = 100mA

IL = 1mA

ELECTRICAL CHARACTERISTICS

The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. (Note 2)

PARAMETER CONDITIONS MIN TYP MAX UNITS

Current Limit VIN = 7V, V

LT1764-1.8, LT1764-2.5, LT1764-3.3
VIN = V

= V

V

IN

LT1764, LT1764-1.5

= 2.7V, ∆V

V

IN

= 2.7V, ∆V

V

IN

Input Reverse Leakage Current VIN = –20V, V
Reverse Output Current (Note 10) LT1764-1.5 V

LT1764-1.8 V
LT1764-2.5 V
LT1764-3.3 V
LT1764 (Note 3) V

= 0V 4 A

OUT

OUT(NOMINAL)
OUT(NOMINAL)

= –0.1V, –40°C ≤ TJ ≤ 110°C 3.1 A

OUT

= –0.1V, 110°C < TJ ≤ 125°C 2.8 A

OUT

= 0V ● 1mA

OUT

= 1.5V, VIN < 1.5V 600 1200 µA

OUT

= 1.8V, VIN < 1.8V 600 1200 µA

OUT

= 2.5V, VIN < 2.5V 600 1200 µA

OUT

= 3.3V, VIN < 3.3V 600 1200 µA

OUT

+ 1V, ∆V
+ 1V, ∆V

= 1.21V, VIN < 1.21V 300 600 µA

OUT

= –0.1V, –40°C ≤ TJ ≤ 110°C 3.1 A

OUT

= –0.1V, 110°C < TJ ≤ 125°C 2.8 A

OUT

Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.

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.

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 VIN = V

= 2.7V (whichever is greater) and a current source load. The GND pin

V

IN

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
VIN = 20V, V

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TYPICAL PERFOR A CE CHARACTERISTICS

Typical Dropout Voltage

600

500

Guaranteed Dropout Voltage

700

= TEST POINTS

600

– V

IN

DROPOUT

cannot be pulled below ground.

OUT

Dropout Voltage

.

OUT(NOMINAL)

+ 1V or

400

300

200

DROPOUT VOLTAGE (mV)

100

0

4

0

TJ = 125°C

1.0 1.5 2.0

0.5
OUTPUT CURRENT (A)

TJ = 25°C

2.5 3.0

1764 G01

500

400

300

200

100

GUARANTEED DROPOUT VOLTAGE (mV)

0

0

TJ ≤ 125°C

TJ ≤ 25°C

0.5 1.0
OUTPUT CURRENT (A)

2.0 3.0

1.5 2.5

1764 G02

1764fa

LT1764 Series

TEMPERATURE (°C)

–50

OUTPUT VOLTAGE (V)

25

1756 G06

–25 0 50

2.58

2.56

2.54

2.52

2.50

2.48

2.46

2.44

2.42
75 100 125

IL = 1mA

UW

TYPICAL PERFOR A CE CHARACTERISTICS

Quiescent Current LT1764-1.8 Output Voltage LT1764-2.5 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

–25 0

∞

= V

IN

TEMPERATURE (°C)

25 75

LT1764

50 100 125

1764 G04

LT1764-3.3 Output Voltage LT1764 ADJ Pin Voltage LT1764-1.8 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

–25 0 50

–50

25

TEMPERATURE (°C)

75 100 125

1756 G07

1.84
IL = 1mA

1.83

1.82

1.81

1.80

1.79

OUTPUT VOLTAGE (V)

1.78

1.77

1.76

–25 0 50

–50

1.230
IL = 1mA

1.225

1.220

1.215

1.210

1.205

ADJ PIN VOLTAGE (V)

1.200

1.195

1.190

–25 0 50

–50

25

TEMPERATURE (°C)

25

TEMPERATURE (°C)

75 100 125

1756 G05

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 107135 9

INPUT VOLTAGE (V)

8

1764 G09

40

35

30

25

20

15

10

QUIESCENT CURRENT (mA)

5

0

LT1764-2.5 Quiescent Current LT1764-3.3 Quiescent Current LT1764 Quiescent Current

TJ = 25°C
R

=

∞

L

V

= V

SHDN

IN

246 107135 9

0

INPUT VOLTAGE (V)

40

35

30

25

20

15

10

QUIESCENT CURRENT (mA)

5

8

1764 G10

0

246 107135 9

0

INPUT VOLTAGE (V)

TJ = 25°C
R

=

∞

L

V

= V

SHDN

8

IN

1764 G11

1.6
TJ = 25°C
R

= 4.3k

1.4

L

= V

V

SHDN

1.2

1.0

0.8

0.6

0.4

QUIESCENT CURRENT (mA)

0.2

0

0

IN

4 8 12 20142 6 10 18

INPUT VOLTAGE (V)

16

1764 G12

1764fa

5