Name: 764-2
SKU: 764-2
Price: 3.08584 USD
Availability: InStock

LT1764 Series

1764fa

3A, Fast Transient

Response, Low Noise,

LDO Regulators

■

Optimized for Fast Transient Response

■

Output Current: 3A

■

Dropout Voltage: 340mV at 3A

■

Low Noise: 40

RMS

(10Hz to 100kHz)

■

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

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. Oper-

ating 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 pro-

tection, current limiting, thermal limiting and reverse cur-

rent 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 regu-

lators are available in 5-lead TO-220 and DD packages.

Dropout Voltage

3.3V

to 2.5V

OUT

Regulator

■

3.3V to 2.5V Logic Power Supply

■

Post Regulator for Switching Supplies

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

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATIO

SHDN

10µF

1764 TA01

OUT

> 3V

SENSE

GND

LT1764-2.5

2.5V

10µF

LOAD CURRENT (A)

0 0.5

DROPOUT VOLTAGE (mV)

1.0 2.01.5

2.5

3.0

1764 TA02

400

350

300

250

200

150

100

LT1764 Series

1764fa

PARAMETER CONDITIONS MIN TYP MAX UNITS

Minimum Input Voltage I

LOAD

= 0.5A 1.7 V

(Notes 3, 11) I

LOAD

= 1.5A 1.9 V

LOAD

= 2.7A, 110°C < T

≤ 125°C 2.3 2.7 V

LOAD

= 3A, –40°C ≤ T

≤ 110°C 2.3 2.7 V

Regulated Output Voltage LT1764-1.5 V

= 2.21V, I

LOAD

= 1mA 1.477 1.500 1.523 V

(Note 4) 2.7V < V

< 20V, 1mA < I

LOAD

< 3A, –40°C ≤ T

≤ 110°C 1.447 1.500 1.545 V

2.7V < V

< 20V, 1mA < I

LOAD

< 2.7A, 110°C < T

≤ 125°C 1.447 1.500 1.545 V

LT1764-1.8 V

= 2.3V, I

LOAD

= 1mA 1.773 1.800 1.827 V

2.8V < V

< 20V, 1mA < I

LOAD

< 3A, –40°C ≤ T

≤ 110°C 1.737 1.800 1.854 V

2.8V < V

< 20V, 1mA < I

LOAD

< 2.7A, 110°C < T

≤ 125°C 1.737 1.800 1.854 V

LT1764-2.5 V

= 3V, I

LOAD

= 1mA 2.462 2.500 2.538 V

3.5V < V

< 20V, 1mA < I

LOAD

< 3A, –40°C ≤ T

≤ 110°C 2.412 2.500 2.575 V

3.5V < V

< 20V, 1mA < I

LOAD

< 2.7A, 110°C < T

≤ 125°C 2.412 2.500 2.575 V

LT1764-3.3 V

= 3.8V, I

LOAD

= 1mA 3.250 3.300 3.350 V

4.3V < V

< 20V, 1mA < I

LOAD

< 3A, –40°C ≤ T

≤ 110°C 3.183 3.300 3.400 V

4.3V < V

< 20V, 1mA < I

LOAD

< 2.7A, 110°C < T

≤ 125°C 3.183 3.300 3.400 V

ADJ Pin Voltage LT1764 V

= 2.21V, I

LOAD

= 1mA 1.192 1.210 1.228 V

(Notes 3, 4) 2.7V < V

< 20V, 1mA < I

LOAD

< 3A, –40°C ≤ T

≤ 110°C 1.168 1.210 1.246 V

2.7V < V

< 20V, 1mA < I

LOAD

< 2.7A, 110°C < T

≤ 125°C 1.168 1.210 1.246 V

ABSOLUTE MAXIMUM RATINGS

PACKAGE/ORDER INFORMATION

(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

The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are T

= 25°C. (Note 2)

ELECTRICAL CHARACTERISTICS

ORDER PART

NUMBER

LT1764EQ

LT1764EQ-1.5

LT1764EQ-1.8

LT1764EQ-2.5

LT1764EQ-3.3

JMAX

= 150°C, θ

= 30°C/ W

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

*PIN 5 = SENSE FOR LT1764-1.8/

LT1764-2.5/LT1764-3.3

= ADJ FOR LT1764

ORDER PART

NUMBER

Q PACKAGE

5-LEAD PLASTIC DD

TAB IS

GND

FRONT VIEW

SENSE/ADJ*

OUT

GND

SHDN

LT1764ET

LT1764ET-1.5

LT1764ET-1.8

LT1764ET-2.5

LT1764ET-3.3

*PIN 5 = SENSE FOR LT1764-1.8/

LT1764-2.5/LT1764-3.3

= ADJ FOR LT1764

JMAX

= 150°C, θ

= 50°C/W

T PACKAGE

5-LEAD PLASTIC TO-220

FRONT VIEW

TAB IS

GND

SENSE/ADJ*

OUT

GND

SHDN

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

LT1764 Series

1764fa

Line Regulation LT1764-1.5 ∆V

= 2.21V to 20V, I

LOAD

= 1mA ● 2.5 10 mV

LT1764-1.8 ∆V

= 2.3V to 20V, I

LOAD

= 1mA ● 310mV

LT1764-2.5 ∆V

= 3V to 20V, I

LOAD

= 1mA ● 410mV

LT1764-3.3 ∆V

= 3.8V to 20V, I

LOAD

= 1mA ● 4.5 10 mV

LT1764 (Note 3) ∆V

= 2.21V to 20V, I

LOAD

= 1mA ● 210mV

Load Regulation LT1764-1.5 V

= 2.7V, ∆I

LOAD

= 1mA to 3A 3 7 mV

= 2.7V, ∆I

LOAD

= 1mA to 3A, –40°C ≤ T

≤ 110°C23mV

= 2.7V, ∆I

LOAD

= 1mA to 2.7A, 110°C < T

≤ 125°C23mV

LT1764-1.8 V

= 2.8V, ∆I

LOAD

= 1mA to 3A 4 8 mV

= 2.8V, ∆I

LOAD

= 1mA to 3A, –40°C ≤ T

≤ 110°C25mV

= 2.8V, ∆I

LOAD

= 1mA to 2.7A, 110°C < T

≤ 125°C25mV

LT1764-2.5 V

= 3.5V, ∆I

LOAD

= 1mA to 3A 4 10 mV

= 3.5V, ∆I

LOAD

= 1mA to 3A, –40°C ≤ T

≤ 110°C30mV

= 3.5V, ∆I

LOAD

= 1mA to 2.7A, 110°C < T

≤ 125°C30mV

LT1764-3.3 V

= 4.3V, ∆I

LOAD

= 1mA to 3A 4 12 mV

= 4.3V, ∆I

LOAD

= 1mA to 3A, –40°C ≤ T

≤ 110°C40mV

= 4.3V, ∆I

LOAD

= 1mA to 2.7A, 110°C < T

≤ 125°C40mV

LT1764 (Note 3) V

= 2.7V, ∆I

LOAD

= 1mA to 3A 2 5 mV

= 2.7V, ∆I

LOAD

= 1mA to 3A, –40°C ≤ T

≤ 110°C20mV

= 2.7V, ∆I

LOAD

= 1mA to 2.7A, 110°C < T

≤ 125°C20mV

Dropout Voltage I

LOAD

= 1mA 0.02 0.05 V

= V

OUT(NOMINAL)

LOAD

= 1mA ● 0.10 V

(Notes 5, 6, 11) I

LOAD

= 100mA 0.07 0.13 V

LOAD

= 100mA ● 0.18 V

LOAD

= 500mA 0.14 0.20 V

LOAD

= 500mA ● 0.27 V

LOAD

= 1.5A 0.25 0.33 V

LOAD

= 1.5A ● 0.40 V

LOAD

= 2.7A, 110°C < T

≤ 125°C 0.66 V

LOAD

= 3A 0.34 0.45 V

LOAD

= 3A, –40°C ≤ T

≤ 110°C 0.66 V

GND Pin Current I

LOAD

= 0mA ● 1 1.5 mA

= V

OUT(NOMINAL)

+ 1V I

LOAD

= 1mA ● 1.1 1.6 mA

(Notes 5, 7) I

LOAD

= 100mA ● 3.5 5 mA

LOAD

= 500mA ● 11 18 mA

LOAD

= 1.5A ● 40 75 mA

LOAD

= 2.7A, 110°C < T

≤ 125°C 120 200 mA

LOAD

= 3A, –40°C ≤ T

≤ 110°C 120 200 mA

Output Voltage Noise C

OUT

= 10µF, I

LOAD

= 3A, BW = 10Hz to 100kHz 40 µV

RMS

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

Shutdown Threshold V

OUT

= Off to On ● 0.9 2 V

OUT

= On to Off ● 0.25 0.75 V

SHDN Pin Current V

SHDN

= 0V 0.01 1 µA

(Note 9) V

SHDN

= 20V 730µA

Quiescent Current in Shutdown V

= 6V, V

SHDN

= 0V 0.01 1 µA

Ripple Rejection V

– V

OUT

= 1.5V (Avg), V

RIPPLE

= 0.5V

P-P

,5563dB

RIPPLE

= 120Hz, I

LOAD

= 1.5A

ELECTRICAL CHARACTERISTICS

PARAMETER CONDITIONS MIN TYP MAX UNITS

The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are T

= 25°C. (Note 2)

Part #	764-2
Description
Category	CRYSTAL
Availability	In Stock
Qty	2

764-2

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