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LT1965 Series

1965fb

For more information www.linear.com/LT1965

Features

applications

Description

1.1A, Low Noise,

Low Dropout Linear Regulator

The LT

1965 series are low noise, low dropout linear regu-

lators. The devices supply 1.1A of output current with a

310mV typical dropout voltage. Operating quiescent current

is 500µA for the adjustable version, reducing to <1µA in

shutdown. Quiescent current is well controlled; it does not

rise in dropout as with many other regulators. The LT1965

regulators have very low output noise which makes them

ideal for sensitive RF and DSP supply applications.

Output voltage ranges from 1.20V to 19.5V. The LT1965

regulators are stable with output capacitors as low as

10µF. Internal protection circuitry includes reverse-battery

protection, current limiting with foldback, thermal limit

ing and reverse-current protection. The LT1965 series

are available in fixed output voltages of 1.5V, 1.8V, 2.5V,

3.3V, and as an adjustable device with a 1.20V reference

voltage. The package offerings include the 5-lead TO-220,

5-lead DD-Pak as well as the thermally enhanced 8-lead

MSOP and low profile (0.75mm) 8-lead 3mm × 3mm DFN.

3.3V to 2.5V Regulator

Output Current: 1.1A

Dropout Voltage: 310mV

Low Noise: 40µV

RMS

(10Hz to 100kHz)

500µA Quiescent Current (Adjustable Version)

Wide Input Voltage Range: 1.8V to 20V

No Protection Diodes Needed

Controlled Quiescent Current in Dropout

Adjustable Output from 1.20V to 19.5V

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

< 1µA Quiescent Current in Shutdown

Stable with 10µF Output Capacitor

Stable with Ceramic or Tantalum Capacitors

Reverse-Battery Protection

No Reverse Current

Current Limit with Foldback Protection

Thermal Limiting

5-Lead TO-220, DD-Pak, Thermally Enhanced 8-Lead

MSOP and 8-Lead 3mm × 3mm DFN Packages

Logic Power Supplies

Post Regulator for Switching Supplies

Low Noise Instrumentation

Dropout Voltage

typical application

OUTPUT CURRENT (A)

DROPOUT VOLTAGE (mV)

100

200

300

0.2

0.4

0.6 0.8 1

400

150

250

350

1.2

1965 TA01b

= 25°C

SHDN

10µF*

*CERAMIC OR TANTALUM

1965 TA01

OUT

> 3V

TO 20V

SENSE

GND

LT1965-2.5

2.5V

1.1A

10µF*

L, LT, LT C , LT M, Linear Technology and the Linear logo are registered trademarks and

ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property

of their respective owners.

Summary of content (22 pages)

PAGE 1
LT1965 Series 1.1A, Low Noise, Low Dropout Linear Regulator Features n n n n n n n n n n n n n n n n n Description Output Current: 1.1A Dropout Voltage: 310mV Low Noise: 40µVRMS (10Hz to 100kHz) 500µA Quiescent Current (Adjustable Version) Wide Input Voltage Range: 1.8V to 20V No Protection Diodes Needed Controlled Quiescent Current in Dropout Adjustable Output from 1.20V to 19.5V Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 3.
PAGE 2
LT1965 Series Absolute Maximum Ratings (Note 1) IN Pin Voltage..........................................................±22V OUT Pin Voltage.......................................................±22V Input to Output Differential Voltage (Note 2) ......... ±22V SENSE Pin Voltage...................................................±22V ADJ Pin Voltage.........................................................±9V SHDN Pin Voltage....................................................
PAGE 3
LT1965 Series order information LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT1965IDD-3.3#PBF LT1965IDD-3.3#TRPBF LDMD 8-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C LT1965EMS8E#PBF LT1965EMS8E#TRPBF LTCXX 8-Lead Plastic MSOP –40°C to 125°C LT1965IMS8E#PBF LT1965IMS8E#TRPBF LTCXX 8-Lead Plastic MSOP –40°C to 125°C LT1965EMS8E-1.5#PBF LT1965EMS8E-1.5#TRPBF LTDKX 8-Lead Plastic MSOP –40°C to 125°C LT1965IMS8E-1.5#PBF LT1965IMS8E-1.
PAGE 4
LT1965 Series Electrical Characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 3) PARAMETER CONDITIONS MIN Minimum Input Voltage (Notes 4, 12) ILOAD = 0.5A ILOAD = 1.1A (TJ < 125°C) ILOAD = 1A (H-Grade, TJ > 125°C) Regulated Output Voltage (Note 5) LT1965-1.5, VIN = 2.1V, ILOAD = 1mA LT1965-1.5, 2.5 < VIN < 20V, 1mA < ILOAD < 1.1A l 1.477 1.455 LT1965-1.8, VIN = 2.3V, ILOAD = 1mA LT1965-1.8, 2.
PAGE 5
LT1965 Series Electrical Characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 3) PARAMETER CONDITIONS SHDN Pin Current (Note 10) VSHDN = 0V VSHDN = 20V Quiescent Current in Shutdown VIN = 6V, VSHDN = 0V Ripple Rejection VIN – VOUT = 1.5V (AVG), VRIPPLE = 0.5VP-P, fRIPPLE = 120Hz, ILOAD = 0.75A Current Limit VIN = 7V, VOUT = 0 VIN = VOUT(NOMINAL) + 1V, ∆VOUT = –0.
PAGE 6
LT1965 Series Typical Performance Characteristics Guaranteed Dropout Voltage 500 450 450 400 TJ = 125°C 300 250 200 TJ = 25°C 150 100 50 0 0.2 0.6 0.8 0.4 OUTPUT CURRENT (A) 1 300 250 150 100 50 0.8 0.7 1.522 1.517 LT1965 0.4 0.3 0.1 0 –50 –25 VSHDN = 0 0 25 50 75 100 125 150 TEMPERATURE (°C) 1965 G04 100 1.827 IL = 1mA 1.821 1.492 OUTPUT VOLTAGE (V) 2.484 1.803 1.797 1.791 1.482 1.779 1.477 –50 –25 1.773 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) IL = 1mA 1.
PAGE 7
LT1965 Series Typical Performance Characteristics LT1965-1.5 Quiescent Current LT1965-1.8 Quiescent Current 5 4 3 2 VSHDN = 0V 0 1 2 3 4 5 6 7 INPUT VOLTAGE (V) 8 9 4 3 2 1 0 10 6 4 0 1.0 0 1 2 8 0.6 9 0 2 3 4 5 6 7 INPUT VOLTAGE (V) 8 0 2 4 9 10 1965 G16 0 1 2 5 5 6 8 10 12 14 16 18 20 INPUT VOLTAGE (V) 0 RL = 180Ω, IL = 10mA* RL = 1.
PAGE 8
LT1965 Series Typical Performance Characteristics LT1965-2.5 GND Pin Current (Light Load) 8 6 4 RL = 250Ω, IL = 10mA* RL = 2.5k, IL = 1mA* RL = 50Ω, IL = 50mA* 2 0 1 2 3 4 5 6 7 INPUT VOLTAGE (V) 8 9 20 10 RL = 5Ω, IL = 500mA* 5 15 RL = 6.6Ω, IL = 500mA* 5 0 2.0 1.6 1 2 3 4 5 6 7 INPUT VOLTAGE (V) 8 8 1.4 9 RL = 24Ω, IL = 50mA* RL = 120Ω, IL = 10mA* 0.6 RL = 1.2k, IL = 1mA* 0.4 0 1 2 0 10 3 4 5 6 7 INPUT VOLTAGE (V) 8 9 10 1965 G21 TJ = 25°C VSHDN = VIN *FOR VOUT = 1.
PAGE 9
LT1965 Series Typical Performance Characteristics SHDN Pin Input Current SHDN Pin Input Current 6.0 5.9 4 3 2 1 ADJ Pin Bias Current 4.5 VSHDN = 20V 4.0 5.8 ADJ PIN BIAS CURRENT (µA) 5 SHDN PIN INPUT CURRENT (µA) SHDN PIN INPUT CURRENT (µA) 6 5.7 5.6 5.5 5.4 5.3 5.2 2 4 5.0 –50 –25 6 8 10 12 14 16 18 20 SHDN PIN VOLTAGE (V) 0 1965 G27 Current Limit vs VIN – VOUT 2.5 TJ = –50°C CURRENT LIMIT (A) TJ = 25°C 1.0 TJ = 150°C 2.0 1.5 1.0 0.5 0.
PAGE 10
LT1965 Series Typical Performance Characteristics Ripple Rejection vs Temperature LT1965 Minimum Input Voltage 100 Load Regulation 0 2.5 70 60 50 40 30 10 IL = 0.75A VIN = VOUT(NOMINAL) + 1V + 0.5P-P RIPPLE AT f = 120Hz 0 –50 –25 0 2.0 IL = 500mA 0.5 0 –50 –25 OUTPUT NOISE VOLTAGE (µVRMS) OUTPUT NOISE SPECTRAL DENSITY (µV Hz) LT1965-3.3 0.10 10 25 50 75 100 125 150 TEMPERATURE (°C) 1965 G36 LT1965 LT1965-1.5 100 1k 10k FREQUENCY (Hz) LT1965-2.5 LT1965-3.
PAGE 11
LT1965 Series Pin Functions (DFN/MSOP/DD-Pak/TO-220) OUT (Pins 1, 2 / 1, 2 / 4 / 4): Output. This pin supplies power to the load. Use a minimum output capacitor of 10µF to prevent oscillations. Large load transient applications require larger output capacitors to limit peak voltage transients. See the Applications Information section for more information on output capacitance and reverse-output characteristics. SHDN (Pin 6 / 6 / 1 / 1): Shutdown.
PAGE 12
LT1965 Series Applications Information The LT1965 series are 1.1A low dropout regulators with shutdown. The devices are capable of supplying 1.1A at a typical dropout voltage of 310mV. The low operating quiescent current (500µA for the adjustable version, 600µA for the fixed voltage versions) drops to less than 1µA in shutdown. In addition to the low quiescent current, the LT1965 regulators incorporate several protection features that makes them ideal for use in battery-powered systems.
PAGE 13
LT1965 Series Applications Information Voltage and temperature coefficients are not the only sources of problems. Some ceramic capacitors have a piezoelectric response. A piezoelectric device generates voltage across its terminals due to mechanical stress, similar to the way a piezoelectric accelerometer or microphone works. For a ceramic capacitor, the stress can be induced by vibrations in the system or thermal transients. The resulting voltages produced can cause appreciable amounts of noise.
PAGE 14
LT1965 Series Applications Information is rising, the input-to-output voltage differential is small, allowing the regulator to supply large output currents. With a high input voltage, a problem can occur wherein removal of an output short will not allow the output to recover. Other regulators, such as the LT1083/LT1084/ LT1085 family, also exhibit this phenomenon, so it is not unique to the LT1965. The problem occurs with a heavy output load when the input voltage is high and the output voltage is low.
PAGE 15
LT1965 Series Applications Information The following tables list thermal resistance for several different board sizes and copper areas. All measurements were taken in still air on a 2-layer 1/16" FR-4 board with one ounce copper. Table 1.
PAGE 16
LT1965 Series Applications Information The input of the device withstands reverse voltages of 22V. The LT1965 limits current flow to less than 1mA (typically less than 300µA) and no negative voltage appears at the output. The device protects both itself and the load against batteries that are plugged in backwards. The LT1965 incurs no damage if its output is pulled below ground. If the input is left open-circuit or grounded, the output can be pulled below ground by 22V.
PAGE 17
LT1965 Series Typical Applications Paralleling of Regulators for Higher Output Current R1 0.01Ω VIN > 3.7V + IN OUT + LT1965-3.3 C1 100µF SHDN SENSE 3.3V 2.2A C2 22µF GND R2 0.01Ω IN OUT R6 6.65k 1% LT1965 SHDN SHDN R3 2.2k R4 2.2k 3 2 ADJ GND + – R5 10k 8 1/2 LT1366 R7 4.02k 1% 1 C3 0.01µF 4 1965 TA03 Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
PAGE 18
LT1965 Series Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. MS8E Package 8-Lead Plastic MSOP, Exposed Die Pad (Reference LTC DWG # 05-08-1662 Rev K) BOTTOM VIEW OF EXPOSED PAD OPTION 1.88 (.074) 1 1.88 ±0.102 (.074 ±.004) 0.29 REF 1.68 (.066) 0.889 ±0.127 (.035 ±.005) 0.05 REF 5.10 (.201) MIN DETAIL “B” CORNER TAIL IS PART OF DETAIL “B” THE LEADFRAME FEATURE. FOR REFERENCE ONLY NO MEASUREMENT PURPOSE 1.68 ±0.102 3.20 – 3.
PAGE 19
LT1965 Series Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. Q Package 5-Lead Plastic DD Pak (Reference LTC DWG # 05-08-1461 Rev F) .256 (6.502) .060 (1.524) TYP .060 (1.524) .390 – .415 (9.906 – 10.541) .165 – .180 (4.191 – 4.572) .045 – .055 (1.143 – 1.397) 15° TYP .060 (1.524) .183 (4.648) +.008 .004 –.004 +0.203 0.102 –0.102 .059 (1.499) TYP .330 – .370 (8.382 – 9.398) ( ) .095 – .115 (2.413 – 2.921) .075 (1.
PAGE 20
LT1965 Series Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. T-Package 5-Lead Plastic TO-220 (Standard) (Reference LTC DWG # 05-08-1421) .390 – .415 (9.906 – 10.541) .165 – .180 (4.191 – 4.572) .147 – .155 (3.734 – 3.937) DIA .045 – .055 (1.143 – 1.397) .230 – .270 (5.842 – 6.858) .460 – .500 (11.684 – 12.700) .570 – .620 (14.478 – 15.748) .330 – .370 (8.382 – 9.398) .700 – .728 (17.78 – 18.491) .620 (15.
PAGE 21
LT1965 Series Revision History (Revision history begins at Rev B) REV DATE DESCRIPTION B 08/13 Added H-grade, specs and curves PAGE NUMBER Lowered max ESR to 0.3Ω Removed references to “starting up from negative output” 2-10 12 11, 12, 16 1965fb Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use.
PAGE 22
LT1965 Series Typical Application Adjustable Current Source R5, 0.01Ω VIN > 2.7V + IN R1 1k C1 10µF LT1004-1.2 R2 80.6k R4 2.2k R3 2k 3 NOTE: ADJUST R1 FOR 0A TO 1.1A CONSTANT-CURRENT C2 3.3µF – + + SHDN ADJ GND R6 2.2k 2 LT1965 OUT R8 100k C3 1µF R7 470Ω 8 1 1/2 LT1366 LOAD C4 10µF 1965 TA04 4 Related Parts PART NUMBER DESCRIPTION COMMENTS LT1129 700mA, Micropower, LDO VIN: 4.2V to 30V, VOUT(MIN) = 3.8V, VDO = 0.