Datasheet

ManualsBrandsLinear Technology ManualsIntegrated Circuits (ICs)LDO Voltage Regulator, 1.2 ... 20V, SON-8

LT1963A Series

1963aff

For more information www.linear.com/LT1963A

Typical applicaTion

DescripTion

1.5A, Low Noise,

Fast Transient Response

LDO Regulators

FeaTures

applicaTions

Optimized for Fast Transient Response

Output Current: 1.5A

Dropout Voltage: 340mV

Low Noise: 40µV

RMS

(10Hz to 100kHz)

1mA Quiescent Current

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*

Stable with Ceramic Capacitors*

Reverse Battery Protection

No Reverse Current

Thermal Limiting

5-Lead TO-220, DD, 3-Lead SOT-223 and

8-Lead SO Packages

The LT

1963A series are low dropout regulators optimized

for fast transient response. The devices are capable of

supplying 1.5A 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 regula

tors. In addition to fast transient response, the LT1963A

regulators have very low output noise which makes them

ideal for sensitive RF supply applications.

Output voltage range is from 1.21V to 20V. The LT1963A

regulators are stable with output capacitors as low as

10µF. Internal protection circuitry includes reverse bat

tery protection

current limiting, thermal limiting and

reverse current protection. The devices are 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

LT1963A regulators are available in 5-lead TO-220, DD,

3-lead SOT-223, 8-lead SO and 16-lead TSSOP packages.

3.3V to 2.5V Regulator

3.3V to 2.5V Logic Power Supplies

Post Regulator for Switching Supplies

SHDN

10µF*

*TANTALUM,

CERAMIC OR

ALUMINUM ELECTROLYTIC

1963A TA01

OUT

> 3V

SENSE

GND

LT1963A-2.5

2.5V

1.5A

10µF*

OUTPUT CURRENT (A)

DROPOUT VOLTAGE (mV)

200

300

1.6

1963A TA02

100

0.4

0.8

1.2

0.2

0.6

1.0

1.4

400

150

250

350

Dropout Voltage

L, LT, LT C, LTM , 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. Protected by U.S. Patents including 6118263, 6144250.

*See Applications Information Section.

Downloaded from Arrow.com.

Summary of content (28 pages)

PAGE 1
LT1963A Series 1.5A, Low Noise, Fast Transient Response LDO Regulators Features n n n n n n n n n n n n n n n n Description Optimized for Fast Transient Response Output Current: 1.5A Dropout Voltage: 340mV Low Noise: 40µVRMS (10Hz to 100kHz) 1mA Quiescent Current No Protection Diodes Needed Controlled Quiescent Current in Dropout Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 3.3V Adjustable Output from 1.
PAGE 2
LT1963A Series Absolute Maximum Ratings (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 SHDN Pin Voltage ..................................................
PAGE 3
LT1963A Series Order Information LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT1963AEQ#PBF LT1963AEQ#TRPBF LT1963AEQ 5-Lead Plastic DD-Pak –40°C to 125°C LT1963AIQ#PBF LT1963AIQ#TRPBF LT1963AIQ 5-Lead Plastic DD-Pak –40°C to 125°C LT1963AMPQ#PBF LT1963AMPQ#TRPBF LT1963AMPQ 5-Lead Plastic DD-Pak –55°C to 125°C LT1963AEQ-1.5#PBF LT1963AEQ-1.5#TRPBF LT1963AEQ-1.5 5-Lead Plastic DD-Pak –40°C to 125°C LT1963AEQ-1.8#PBF LT1963AEQ-1.
PAGE 4
LT1963A Series order information LEAD BASED FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT1963AET-1.5 LT1963AET-1.5#TR LT1963AET-1.5 5-Lead Plastic TO-220 –40°C to 125°C LT1963AET-1.8 LT1963AET-1.8#TR LT1963AET-1.8 5-Lead Plastic TO-220 –40°C to 125°C LT1963AET-2.5 LT1963AET-2.5#TR LT1963AET-2.5 5-Lead Plastic TO-220 –40°C to 125°C LT1963AET-3.3 LT1963AET-3.3#TR LT1963AET-3.
PAGE 5
LT1963A Series Electrical Characteristics The l denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 3) PARAMETER CONDITIONS Minimum Input Voltage (Notes 4,12) ILOAD = 0.5A ILOAD = 1.5A Regulated Output Voltage (Note 5) MIN l LT1963A-1.5 LT1963A-1.8 LT1963A-2.5 LT1963A-3.3 ADJ Pin Voltage (Notes 4, 5) LT1963A Line Regulation LT1963A-1.5 LT1963A-1.8 LT1963A-2.5 LT1963A-3.3 LT1963A (Note 4) Load Regulation LT1963A-1.
PAGE 6
LT1963A Series Electrical Characteristics The l denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 3) PARAMETER CONDITIONS Ripple Rejection VIN – VOUT = 1.5V (Avg), VRIPPLE = 0.5VP-P, fRIPPLE = 120Hz, ILOAD = 0.75A Current Limit VIN = 7V, VOUT = 0V VIN = VOUT(NOMINAL) + 1V, ∆VOUT = – 0.
PAGE 7
LT1963A Series Typical Performance Characteristics Typical Dropout Voltage Guaranteed Dropout Voltage 600 GUARANTEED DROPOUT VOLTAGE (mV) 450 DROPOUT VOLTAGE (mV) 400 350 TJ = 125°C 300 250 TJ = 25°C 200 150 100 50 0 0 0.2 1.4 0.4 0.6 0.8 1.0 1.2 OUTPUT CURRENT (A) = TEST POINTS 500 450 TJ ≤ 125°C 400 TJ ≤ 25°C 300 200 100 0 1.6 Dropout Voltage 500 350 250 150 0 0.2 1.4 0.4 0.6 0.8 1.0 1.2 OUTPUT CURRENT (A) 0 –50 1.6 1.53 1.83 1.52 1.82 0.
PAGE 8
LT1963A Series TYPICAL PERFORMANCE CHARACTERISTICS 14 TJ = 25°C R =∞ 12 L VSHDN = VIN 10 8 6 4 2 8 6 4 1 3 4 5 6 7 INPUT VOLTAGE (V) 2 9 8 0 10 0 1 2 3 4 5 6 7 INPUT VOLTAGE (V) 1.4 8 6 4 2 0 1 2 3 4 5 6 7 INPUT VOLTAGE (V) 8 9 10 1963A G10 LT1963A-1.5 GND Pin Current 1.0 0.8 0.6 0.4 25 TJ = 25°C VSHDN = VIN *FOR VOUT = 1.5V 20 15 RL = 150, IL = 10mA* 10 RL = 5, IL = 300mA* 5 RL = 15, IL = 100mA* 0.2 0 1 3 4 5 6 7 INPUT VOLTAGE (V) 2 8 9 0 10 0 2 4 LT1963A-1.
PAGE 9
LT1963A Series TYPICAL PERFORMANCE CHARACTERISTICS TJ = 25°C VSHDN = VIN *FOR VOUT = 1.21V 8 RL = 4.33, IL = 300mA* 6 4 RL = 12.1, IL = 100mA* 80 70 60 RL = 1, IL = 1.5A* 50 RL = 1.5, IL = 1A* 40 30 2 RL = 3, IL = 500mA* 20 RL = 121, IL = 10mA* 0 0 1 2 3 4 5 6 7 INPUT VOLTAGE (V) 8 9 10 1 2 3 4 5 6 7 INPUT VOLTAGE (V) 80 70 0 50 40 RL = 3.
PAGE 10
LT1963A Series TYPICAL PERFORMANCE CHARACTERISTICS SHDN Pin Input Current SHDN Pin Input Current 7 SHDN PIN INPUT CURRENT (µA) SHDN PIN INPUT CURRENT (µA) 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 0 2 VSHDN = 20V 4.5 6 5 4 3 2 1 0 –50 –25 6 8 10 12 14 16 18 20 SHDN PIN VOLTAGE (V) 4 ADJ Pin Bias Current 5.0 ADJ PIN BIAS CURRENT (µA) 5.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 50 25 75 0 TEMPERATURE (°C) 100 0 –50 125 –25 50 25 0 75 TEMPERATURE (°C) 1963A G25 1963A G24 Current Limit 4.0 3.
PAGE 11
LT1963A Series TYPICAL PERFORMANCE CHARACTERISTICS Ripple Rejection LT1963A Minimum Input Voltage 3.0 70 74 2.5 60 50 40 COUT = 100µF TANTALUM +10 × 1µF CERAMIC 30 COUT = 10µF TANTALUM 20 MINIMUM INPUT VOLTAGE (V) 76 RIPPLE REJECTION (dB) RIPPLE REJECTION (dB) Ripple Rejection 80 72 70 68 66 64 IL = 0.75A VIN = VOUT(NOMINAL) +1V + 0.5VP-P RIPPLE AT f = 120Hz 62 50 100 25 75 –50 –25 0 TEMPERATURE (°C) 10 IL = 0.
PAGE 12
LT1963A Series TYPICAL PERFORMANCE CHARACTERISTICS LT1963A-3.3 Transient Response LT1963A-3.3 Transient Response 150 VIN = 4.3V 150 CIN = 3.3µF TANTALUM COUT = 10µF TANTALUM 100 OUTPUT VOLTAGE DEVIATION (mV) OUTPUT VOLTAGE DEVIATION (mV) 200 50 0 –50 100 50 0 –50 –100 1.5 LOAD CURRENT (A) –150 0.6 LOAD CURRENT (A) –100 0.4 0.2 0 0 2 4 6 8 10 12 14 16 18 20 TIME (µs) VIN = 4.3V CIN = 33µF TANTALUM COUT = 100µF TANTALUM +10 × 1µF CERAMIC 1.0 0.
PAGE 13
LT1963A Series Pin Functions OUT: Output. The output supplies power to the load. A minimum output capacitor of 10µF 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: Sense. For fixed voltage versions of the LT1963A (LT1963A-1.5/LT1963A-1.8/LT1963A-2.5/LT1963A-3.
PAGE 14
LT1963A Series Applications Information The LT1963A series are 1.5A low dropout regulators optimized for fast transient response. The devices are capable of supplying 1.5A at a dropout voltage of 350mV. The low operating quiescent current (1mA) drops to less than 1µA in shutdown. In addition to the low quiescent current, the LT1963A regulators incorporate several protection features which make them ideal for use in battery-powered systems.
PAGE 15
LT1963A Series APPLICATIONS INFORMATION Table 1. Capacitor Minimum ESR VOUT 10µF 22µF 47µF 100µF 1.2V 20mΩ 15mΩ 10mΩ 5mΩ 1.5V 20mΩ 15mΩ 10mΩ 5mΩ 1.8V 15mΩ 10mΩ 10mΩ 5mΩ 2.5V 5mΩ 5mΩ 5mΩ 5mΩ 3.3V 0mΩ 0mΩ 0mΩ 5mΩ ≥5V 0mΩ 0mΩ 0mΩ 0mΩ Figures 3 through 8 show the effect of ESR on the transient response of the regulator. These scope photos show the transient response for the LT1963A at three different output voltages with various capacitors and various values of ESR.
PAGE 16
LT1963A Series APPLICATIONS INFORMATION VOUT = 1.2V IOUT = 500mA WITH 500mA PULSE COUT = 10µF RESR (mΩ) 50 5 50mV/DIV 50mV/DIV 20 VOUT = 1.2V IOUT = 500mA WITH 500mA PULSE COUT = 100µF 0 RESR (mΩ) 0 10 20 100 20µs/DIV 1963A F03 50µs/DIV Figure 3 Figure 6 VOUT = 2.5V IOUT = 500mA WITH 500mA PULSE COUT = 10µF RESR (mΩ) 50 VOUT = 2.
PAGE 17
LT1963A Series APPLICATIONS INFORMATION Y5V dielectrics are good for providing high capacitances in a small package, but exhibit strong voltage and temperature coefficients as shown in Figures 10 and 11. When used with a 5V regulator, a 10µF Y5V capacitor can exhibit an effective value as low as 1µF to 2µF over the operating temperature range. The X5R and X7R dielectrics result in more stable characteristics and are more suitable for use as the output capacitor.
PAGE 18
LT1963A Series APPLICATIONS INFORMATION This resistor should be made using one of the inner layers of the PC board which are well defined. The resistivity is determined primarily by the sheet resistance of the copper laminate with no additional plating steps. Table 2 gives some sizes for 0.75A RMS current for various copper thicknesses. More detailed information regarding resistors made from PC traces can be found in Application Note 69, Appendix A.
PAGE 19
LT1963A 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 1/16" FR-4 board with one ounce copper. Table 3. Q Package, 5-Lead DD COPPER AREA TOPSIDE* BACKSIDE BOARD AREA THERMAL RESISTANCE (JUNCTION-TO-AMBIENT) 2500mm2 2500mm2 2500mm2 23°C/W 1000mm2 2500mm2 2500mm2 25°C/W 125mm2 2500mm2 2500mm2 33°C/W *Device is mounted on topside Table 4.
PAGE 20
LT1963A Series APPLICATIONS INFORMATION The ADJ pin of the adjustable device can be pulled above or below ground by as much as 7V without damaging the device. If the input is left open circuit or grounded, the ADJ pin will act like an open circuit when pulled below ground and like a large resistor (typically 5k) in series with a diode when pulled above ground.
PAGE 21
LT1963A Series Typical Applications SCR Pre-Regulator Provides Efficiency Over Line Variations L1 500µH L2 1N4148 10VAC AT 115VIN 90-140 VAC LT1963A-3.3 IN OUT + SHDN GND 10000µF 1k FB 3.3VOUT 1.5A + 22µF 34k* 10VAC AT 115VIN 1N4002 1N4002 1N4002 TO ALL “+V” POINTS + 22µF 12.1k* +V “SYNC” 2.4k + 750Ω – C1A 200k 1N4148 1/2 LT1018 0.1µF +V C1B +V 1/2 LT1018 A1 1N4148 + – LT1006 10k – 750Ω + 0.
PAGE 22
LT1963A Series PACKAGE DESCRIPTION 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 (1.905) DETAIL A .300 (7.620) +.012 .143 –.020 +0.305 3.632 –0.
PAGE 23
LT1963A Series PACKAGE DESCRIPTION S8 Package 8-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) .189 – .197 (4.801 – 5.004) NOTE 3 .045 ±.005 .050 BSC 8 .245 MIN .160 ±.005 .010 – .020 × 45° (0.254 – 0.508) 2 .053 – .069 (1.346 – 1.752) 0°– 8° TYP .016 – .050 (0.406 – 1.270) 5 .150 – .157 (3.810 – 3.988) NOTE 3 1 RECOMMENDED SOLDER PAD LAYOUT .008 – .010 (0.203 – 0.254) 6 .228 – .244 (5.791 – 6.197) .030 ±.005 TYP NOTE: 1. DIMENSIONS IN 7 .014 – .019 (0.
PAGE 24
LT1963A Series PACKAGE DESCRIPTION ST Package 3-Lead Plastic SOT-223 (Reference LTC DWG # 05-08-1630) .248 – .264 (6.30 – 6.71) .129 MAX .114 – .124 (2.90 – 3.15) .059 MAX .264 – .287 (6.70 – 7.30) .248 BSC .130 – .146 (3.30 – 3.71) .039 MAX .059 MAX .181 MAX .033 – .041 (0.84 – 1.04) .0905 (2.30) BSC RECOMMENDED SOLDER PAD LAYOUT 10° – 16° .010 – .014 (0.25 – 0.36) 10° MAX .071 (1.80) MAX .090 BSC 10° – 16° .024 – .033 (0.60 – 0.84) .181 (4.60) BSC 24 Downloaded from Arrow.com. .012 (0.
PAGE 25
LT1963A Series PACKAGE DESCRIPTION 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 (15.75) TYP SEATING PLANE .152 – .202 .260 – .320 (3.861 – 5.131) (6.60 – 8.13) BSC .067 (1.70) .095 – .115 (2.413 – 2.
PAGE 26
LT1963A Series Package Description FE Package 16-Lead Plastic TSSOP (4.4mm) (Reference LTC DWG # 05-08-1663 Rev J) Exposed Pad Variation BB 4.70 (.185) 3.58 (.141) DETAIL A 4.90 – 5.10* (.193 – .201) 0.56 (.022) REF 3.58 (.141) NOTE 5 16 1514 13 12 1110 9 NOTE 5 6.60 ±0.10 2.94 3.05 (.116) (.120) 4.50 ±0.10 DETAIL A SEE NOTE 4 2.94 6.40 (.116) (.252) BSC 0.53 (.021) REF DETAIL A IS THE PART OF THE LEAD FRAM FEATURE FOR REFERENCE ONLY NO MEASUREMENT PUROSE 1.05 ±0.10 0.65 BSC 0.45 ±0.
PAGE 27
LT1963A Series Revision History (Revision history begins at Rev E) REV DATE DESCRIPTION PAGE NUMBER E 02/11 Updated FE and Q package drawings in Package Description section F 09/13 Replaced graphs with correct versions 22, 26 16 1963aff Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use.
PAGE 28
LT1963A Series Typical Application Adjustable Current Source R5 0.01Ω VIN > 2.7V + C1 10µF R1 1k LT1004-1.2 R2 80.6k R3 2k R4 2.2k LT1963A-1.8 IN OUT R6 2.2k 2 3 C2 3.3µF NOTE: ADJUST R1 FOR 0A TO 1.5A CONSTANT CURRENT SHDN GND LOAD FB R8 100k C3 1µF + – R7 470Ω 8 1 1/2 LT1366 4 1963A TA04 Related Parts PART NUMBER DESCRIPTION COMMENTS LT1175 500mA, Micropower, Negative LDO VIN: –20V to –4.3V, VOUT(MIN) = –3.8V, VDO = 0.