Datasheet

ManualsBrandsLINEAR TECHNOLOGY ManualsPMICsPMIC - LDO voltage regulator Positive, fixed MSOP 8

LT1962 Series

1962fa1962fb

For more information www.linear.com/LT1962

Typical applicaTion

DescripTion

300mA, Low Noise,

Micropower

LDO Regulators

The LT

1962 series are micropower, low noise, low dropout

regulators. The devices are capable of supplying 300mA

of output current with a dropout voltage of 270mV. De

signed for use in battery-powered systems, the low 30µA

quiescent current makes them an ideal choice. Quiescent

current is well controlled; it does not rise in dropout as it

does with many other regulators.

A key feature of the LT1962 regulators is low output noise.

With the addition of an external 0.01µF bypass capacitor,

output noise drops to 20µV

RMS

over a 10Hz to 100kHz

bandwidth. The LT1962 regulators are stable with output

capacitors as low as 3.3µF. Small ceramic capacitors can

be used without the series resistance required by other

regulators.

Internal protection circuitry includes reverse battery protec

tion, current limiting, thermal limiting and reverse current

protection. The parts come in fixed output voltages of 1.5V,

1.8V, 2.5V, 3V, 3.3V and 5V, and as an adjustable device

with a 1.22V reference voltage. The LT1962 regulators are

available in the 8-lead MSOP package.

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

of Linear Technology Corporation. All other trademarks are the property of their respective

owners.

FeaTures

applicaTions

Low Noise: 20µV

RMS

(10Hz to 100kHz)

Output Current: 300mA

Low Quiescent Current: 30µA

Wide Input Voltage Range: 1.8V to 20V

Low Dropout Voltage: 270mV

Very Low Shutdown Current: < 1µA

No Protection Diodes Needed

Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 3V, 3.3V, 5V

Adjustable Output from 1.22V to 20V

Stable with 3.3µF Output Capacitor

Stable with Aluminum, Tantalum or

Ceramic Capacitors

Reverse Battery Protection

No Reverse Current

Overcurrent and Overtemperature Protected

8-Lead MSOP Package

Cellular Phones

Battery-Powered Systems

Noise-Sensitive Instrumentation Systems

3.3V Low Noise Regulator

Dropout Voltage

SHDN

0.01µF

10µF

1962 TA01

OUT

SENSE

3.7V TO

20V

BYP

GND

LT1962-3.3

3.3V AT 300mA

20µV

RMS

NOISE

1µF

LOAD CURRENT (mA)

DROPOUT VOLTAGE (mV)

400

350

300

250

200

150

100

1962 TA02

100

200

300

150

250

Downloaded from Arrow.com.

Summary of content (18 pages)

PAGE 1
LT1962 Series 300mA, Low Noise, Micropower LDO Regulators Features Description Low Noise: 20µVRMS (10Hz to 100kHz) nn Output Current: 300mA nn Low Quiescent Current: 30µA nn Wide Input Voltage Range: 1.8V to 20V nn Low Dropout Voltage: 270mV nn Very Low Shutdown Current: < 1µA nn No Protection Diodes Needed nn Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 3V, 3.3V, 5V nn Adjustable Output from 1.22V to 20V nn Stable with 3.
PAGE 2
LT1962 Series Absolute Maximum Ratings Pin Configuration (Note 1) IN Pin Voltage..........................................................±20V OUT Pin Voltage.......................................................±20V Input to Output Differential Voltage (Note 2)............±20V SENSE Pin Voltage...................................................±20V ADJ Pin Voltage.........................................................±7V BYP Pin Voltage......................................................±0.
PAGE 3
LT1962 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 ADJ Pin Voltage (Notes 4, 5) LT1962 Line Regulation Load Regulation VIN = 2V, ILOAD = 1mA 2.3V < VIN < 20V, 1mA < ILOAD < 300mA l LT1962-1.5 LT1962-1.8 LT1962-2.5 LT1962-3 LT1962-3.3 LT1962-5 LT1962 (Note 4) ∆VIN = 2V to 20V, ILOAD = 1mA ∆VIN = 2.
PAGE 4
LT1962 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 Reverse Output Current (Note 11) LT1962-1.5 LT1962-1.8 LT1962-2.5 LT1962-3 LT1962-3.3 LT1962-5 LT1962 (Note 4) MIN VOUT = 1.5V, VIN < 1.5V VOUT = 1.8V, VIN < 1.8V VOUT = 2.5V, VIN < 2.5V VOUT = 3V, VIN < 3V VOUT = 3.3V, VIN < 3.3V VOUT = 5V, VIN < 5V VOUT = 1.22V, VIN < 1.
PAGE 5
LT1962 Series Typical Performance Characteristics Quiescent Current LT1962-1.5 Output Voltage 1.532 40 OUTPUT VOLTAGE (V) QUIESCENT CURRENT (µA) 45 35 30 25 20 15 10 5 VIN = 6V VSHDN = VIN RL = ∞, IL = 0 (LT1962-1.5/-1.8 /2.5/-3/-3.3/-5) RL = 250k, IL = 5µA (LT1962) 0 –50 –25 50 25 0 75 TEMPERATURE (°C) IL = 1mA 1.524 1.827 1.516 1.818 1.508 1.500 1.492 1.484 1.476 100 1.468 –50 125 LT1962-2.5 Output Voltage IL = 1mA 1.791 1.782 –25 50 75 0 25 TEMPERATURE (°C) 1.
PAGE 6
LT1962 Series Typical Performance Characteristics TJ = 25°C RL = ∞ 600 500 400 300 VSHDN = 0V 0 1 2 3 4 5 6 7 INPUT VOLTAGE (V) 8 400 300 9 0 10 QUIESCENT CURRENT (µA) QUIESCENT CURRENT (µA) 400 300 0 VSHDN = 0V 1 2 3 4 5 6 7 INPUT VOLTAGE (V) 8 9 250 0 0 1 2 RL = 1.5k IL = 1mA* 3 4 5 6 7 INPUT VOLTAGE (V) Downloaded from Arrow.com. 2 8 3 4 5 6 7 INPUT VOLTAGE (V) 8 9 1250 RL = 180Ω IL = 10mA* 9 10 0 0 1 2 RL = 1.
PAGE 7
LT1962 Series Typical Performance Characteristics RL = 60Ω IL = 50mA* 750 RL = 300Ω IL = 10mA* 500 RL = 3k IL = 1mA* 250 0 0 1 3 4 5 6 7 INPUT VOLTAGE (V) 2 RL = 66Ω IL = 50mA* 1000 750 RL = 330Ω IL = 10mA* 500 RL = 3.
PAGE 8
LT1962 Series Typical Performance Characteristics LT1962 GND Pin Current 8 6 RL = 16.7Ω IL = 300mA* 5 RL = 25Ω IL = 200mA* 4 3 RL = 50Ω IL = 100mA* 2 1 6 5 4 2 RL = 12.2Ω IL = 100mA* 1 1 0 2 3 4 5 6 7 INPUT VOLTAGE (V) 8 9 0 10 0 1 2 1962 G31 3 4 5 6 7 INPUT VOLTAGE (V) 0.7 0.6 0.5 0.4 0.3 0.2 0.1 100 0.7 0.6 IL = 1mA 0.5 0.4 0.3 0.2 –25 50 25 0 75 TEMPERATURE (°C) 100 0.4 Downloaded from Arrow.com. 0.8 0.6 0.4 0.
PAGE 9
LT1962 Series Typical Performance Characteristics Current Limit 0.8 0.6 0.4 0.2 TJ = 25°C 90 VIN = 0V CURRENT FLOWS 80 INTO OUTPUT PIN 70 VOUT = VADJ (LT1962) 50 25 75 0 TEMPERATURE (°C) 50 40 100 COUT = 10µF 40 30 COUT = 3.3µF 20 10 1k 10k FREQUENCY (Hz) 100 70 100k 1M 1962 G43 50 40 LOAD REGULATION (mV) IL = 1mA 1.00 0.75 0.50 –25 9 10 1962 G41 CBYP = 100pF 50 25 0 75 TEMPERATURE (°C) 100 125 1962 G46 LT1962-1.8 LT1962-3.3 LT1962-3 LT1962-2.
PAGE 10
LT1962 Series Typical Performance Characteristics RMS Output Noise vs Bypass Capacitor 160 IL = 300mA COUT = 10µF CBYP = 1000pF 1 CBYP = 100pF LT1962 CBYP = 0.01µF 0.1 160 IL = 300mA COUT = 10µF f = 10Hz to 100kHz 140 LT1962-5 RMS Output Noise vs Load Current (10Hz to 100kHz) 120 LT1962-5 100 80 LT1962-3 LT1962-3.3 LT1962-2.5 LT1962-1.8 LT1962-1.5 60 40 LT1962 20 10 100 1k 10k FREQUENCY (Hz) 0 100k 100 10 1k CBYP (pF) 1962 G49 VOUT 100µV/DIV 1962 G52 1ms/DIV 1962 G53 –0.2 –0.
PAGE 11
LT1962 Series Pin Functions OUT (Pin 1): Output. The output supplies power to the load. A minimum output capacitor of 3.3µF is required to prevent oscillations. Larger output capacitors will be required for applications with large transient loads to limit peak voltage transients. See the Applications Information section for more information on output capacitance and reverse output characteristics. SENSE (Pin 2): Sense. For fixed voltage versions of the LT1962 (LT1962-1.5/LT1962-1.8/LT1962-2.
PAGE 12
LT1962 Series Applications Information The LT1962 series are 300mA low dropout regulators with micropower quiescent current and shutdown. The devices are capable of supplying 300mA at a dropout voltage of 300mV. Output voltage noise can be lowered to 20µVRMS over a 10Hz to 100kHz bandwidth with the addition of a 0.01µF reference bypass capacitor. Additionally, the reference bypass capacitor will improve transient response of the regulator, lowering the settling time for transient load conditions.
PAGE 13
LT1962 Series Applications Information The LT1962-X is a micropower device and output transient response will be a function of output capacitance. Larger values of output capacitance decrease the peak deviations and provide improved transient response for larger load current changes. Bypass capacitors, used to decouple individual components powered by the LT1962, will increase the effective output capacitor value.
PAGE 14
LT1962 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.
PAGE 15
LT1962 Series Applications Information The LT1962 regulators incorporate several protection features which make them ideal for use in battery-powered circuits. In addition to the normal protection features associated with monolithic regulators, such as current limiting and thermal limiting, the devices are protected against reverse input voltages, reverse output voltages and reverse voltages from output to input.
PAGE 16
LT1962 Series Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. MS8 Package 8-Lead Plastic MSOP MS8 Package (LTC DWGPlastic # 05-08-1660 8-Lead MSOPRev G) (Reference LTC DWG # 05-08-1660 Rev G) 0.889 ±0.127 (.035 ±.005) 5.10 (.201) MIN 3.20 – 3.45 (.126 – .136) 3.00 ±0.102 (.118 ±.004) (NOTE 3) 0.65 (.0256) BSC 0.42 ± 0.038 (.0165 ±.0015) TYP 8 7 6 5 0.52 (.0205) REF RECOMMENDED SOLDER PAD LAYOUT 0.254 (.010) 3.00 ±0.102 (.
PAGE 17
LT1962 Series Revision History (Revision history begins at Rev B) REV DATE DESCRIPTION B 5/15 Clarified the Order Information table. PAGE NUMBER Added I-grade option. 2 2, 4 1962fb 1962fa Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
PAGE 18
LT1962 Series Typical Application Adjustable Current Source R1 0.1Ω R5 0.1Ω + VIN >2.7V C1 10µF Paralleling of Regulators for Higher Output Current IN R1* 1k OUT SHDN LT1004-1.2 R2 40.2k R3 2k LOAD LT1962-2.5 R6 2.2k VIN > 3.7V + IN C1 10µF IN + C5 0.01µF LT1962 BYP 1962 TA04 C2 10µF OUT C3 0.33µF 1/2 LT1490 3.3V 300mA SHDN BYP GND R2 0.1Ω *ADJUST R1 FOR 0mA TO 300mA CONSTANT CURRENT C4 0.01µF LT1962-3.3 R7 100k R4 2.