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LT1763 Series

1763fg

TYPICAL APPLICATION

DESCRIPTION

500mA, Low Noise, LDO

Micropower Regulators

The LT

1763 series are micropower, low noise, low dropout

regulators. The devices are capable of supplying 500mA of

output current with a dropout voltage of 300mV. Designed

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 LT1763 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 LT1763 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

protection, current limiting, thermal limiting and reverse

current protection. The parts come in ﬁ xed 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 LT1763

regulators are available in 8-lead SO and 12-lead, low

proﬁ le (4mm × 3mm × 0.75mm) DFN packages.

3.3V Low Noise Regulator

FEATURES

APPLICATIONS

Low Noise: 20μV

RMS

(10Hz to 100kHz)

Output Current: 500mA

Low Quiescent Current: 30μA

Wide Input Voltage Range: 1.8V to 20V

Low Dropout Voltage: 300mV

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 SO and 12-Lead (4mm × 3mm) DFN

Packages

Cellular Phones

Battery-Powered Systems

Noise-Sensitive Instrumentation Systems

Dropout Voltage

SHDN

0.01μF

10μF

1763 TA01

OUT

SENSE

3.7V TO

20V

BYP

GND

LT1763-3.3

3.3V AT 500mA

20μV

RMS

NOISE

1μF

OUTPUT CURRENT (mA)

DROPOUT VOLTAGE (mV)

400

350

300

250

200

150

100

400

1763 TA02

100

200

300

500

L, LT, LTC, 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 6144250, 6118263.

Summary of content (22 pages)

PAGE 1
LT1763 Series 500mA, Low Noise, LDO Micropower Regulators FEATURES DESCRIPTION n The LT®1763 series are micropower, low noise, low dropout regulators. The devices are capable of supplying 500mA of output current with a dropout voltage of 300mV. Designed 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.
PAGE 2
LT1763 Series ABSOLUTE MAXIMUM RATINGS (Note 1) IN Pin Voltage ........................................................ ±20V OUT Pin Voltage ..................................................... ±20V Input to Output Differential Voltage ........................ ±20V SENSE Pin Voltage ............................................... ±20V ADJ Pin Voltage ...................................................... ±7V BYP Pin Voltage .....................................................±0.6V SHDN Pin Voltage .....
PAGE 3
LT1763 Series ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT1763CDE-3#PBF LT1763CDE-3#TRPBF 17633 12-Lead (4mm × 3mm) Plastic DFN –40°C to 125°C LT1763IDE-3#PBF LT1763IDE-3#TRPBF 17633 12-Lead (4mm × 3mm) Plastic DFN –40°C to 125°C LT1763MPDE-3#PBF LT1763MPDE-3#TRPBF 17633 12-Lead (4mm × 3mm) Plastic DFN –55°C to 125°C LT1763CDE-3.3#PBF LT1763CDE-3.3#TRPBF 76333 12-Lead (4mm × 3mm) Plastic DFN –40°C to 125°C LT1763IDE-3.
PAGE 4
LT1763 Series ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT1763CDE-3.3 LT1763CDE-3.3#TR 76333 12-Lead (4mm × 3mm) Plastic DFN –40°C to 125°C LT1763IDE-3.3 LT1763IDE-3.3#TR 76333 12-Lead (4mm × 3mm) Plastic DFN –40°C to 125°C LT1763MPDE-3.3 LT1763MPDE-3.
PAGE 5
LT1763 Series ELECTRICAL CHARACTERISTICS The l denotes the speciﬁcations which apply over the full operating temperature range, otherwise speciﬁcations are at TA = 25°C. (Note 2) PARAMETER CONDITIONS ADJ Pin Voltage (Notes 3, 4) LT1763 VIN = 2.2V, ILOAD = 1mA C, I Grade: 2.3V < VIN < 20V, 1mA < ILOAD < 500mA MP Grade: 2.35V < VIN < 20V, 1mA < ILOAD < 500mA l l Line Regulation LT1763-1.5 LT1763-1.5 LT1763-1.8 LT1763-2.5 LT1763-3 LT1763-3.
PAGE 6
LT1763 Series ELECTRICAL CHARACTERISTICS The l denotes the speciﬁcations which apply over the full operating temperature range, otherwise speciﬁcations are at TA = 25°C. (Note 2) PARAMETER CONDITIONS Current Limit VIN = 7V, VOUT = 0V C, I Grade: VIN = VOUT(NOMINAL) + 1V or 2.3V (Note 12), ΔVOUT = –0.1V MP Grade: VIN = 2.35V (Note 12), ΔVOUT = –0.1V MIN l l Input Reverse Leakage Current VIN = –20V, VOUT = 0V l Reverse Output Current (Note 10) LT1763-1.5 LT1763-1.8 LT1763-2.5 LT1763-3 LT1763-3.
PAGE 7
LT1763 Series TYPICAL PERFORMANCE CHARACTERISTICS TJ = 125°C 350 300 250 TJ = 25°C 200 150 100 50 0 = TEST POINTS 450 450 400 400 DROPOUT VOLTAGE (mV) GUARANTEED DROPOUT VOLTAGE (mV) 450 DROPOUT VOLTAGE (mV) 500 500 400 TJ b 125°C 350 300 TJ b 25°C 250 200 150 200 150 50 50 100 150 200 250 300 350 400 450 500 OUTPUT CURRENT (mA) 20 15 125 IL = 1mA 1.521 1.83 1.514 1.82 OUTPUT VOLTAGE (V) OUTPUT VOLTAGE (V) 40 100 1.84 IL = 1mA 25 50 25 0 75 TEMPERATURE (°C) LT1763-1.
PAGE 8
LT1763 Series TYPICAL PERFORMANCE CHARACTERISTICS LT1763-5 Output Voltage LT1763 ADJ Pin Voltage 5.100 250 1.240 IL = 1mA 1.235 5.050 1.230 5.025 5.000 4.975 4.950 4.925 IL = 1mA 1.225 1.220 1.215 1.210 1.205 4.900 –50 0 –25 25 50 75 100 125 1.
PAGE 9
LT1763 Series TYPICAL PERFORMANCE CHARACTERISTICS LT1763-1.8 GND Pin Current LT1763-1.5 GND Pin Current 1200 1200 1200 800 TJ = 25°C VIN = VSHDN *FOR VOUT = 1.5V 600 RL = 150Ω IL = 10mA* 400 RL = 1.5k IL = 1mA* 200 0 1 2 1000 RL = 36Ω IL = 50mA* 800 TJ = 25°C VIN = VSHDN *FOR VOUT = 1.8V 600 RL = 180Ω IL = 10mA* 400 200 3 4 5 6 7 INPUT VOLTAGE (V) 8 9 0 10 RL = 1.
PAGE 10
LT1763 Series TYPICAL PERFORMANCE CHARACTERISTICS LT1763-2.5 GND Pin Current LT1763-3 GND Pin Current 12 TJ = 25°C VIN = VSHDN *FOR VOUT = 2.5V 10 GND PIN CURRENT (mA) RL = 5Ω IL = 500mA* 8 6 RL = 8.
PAGE 11
LT1763 Series TYPICAL PERFORMANCE CHARACTERISTICS SHDN Pin Input Current ADJ Pin Bias Current 1.6 Current Limit 1.0 140 1.0 0.8 0.6 0.4 0.8 100 CURRENT LIMIT (A) 1.2 80 60 40 0 –50 –25 0 25 50 75 100 50 25 0 75 TEMPERATURE (°C) –25 TEMPERATURE (°C) 100 Current Limit 0 0.8 0.6 0.4 0.2 100 TJ = 25°C, VIN = 0V CURRENT FLOWS INTO OUTPUT PIN VOUT = VADJ (LT1763) 90 80 70 50 30 LT1763-1.5 LT1763 LT1763-1.8 60 40 LT1763-2.5 LT1763-3 LT1763-3.
PAGE 12
LT1763 Series TYPICAL PERFORMANCE CHARACTERISTICS LT1763 Minimum Input Voltage LT1763-2.5 LT1763 2.25 LOAD REGULATION (mV) 1.75 IL = 1mA 1.50 LT1763-1.8 0 IL = 500mA 2.00 1.25 1.00 0.75 0.50 –5 LT1763-3 –10 LT1763-3.3 LT1763-5 –15 –20 VIN = VOUT(NOMINAL) + 1V $IL = 1mA TO 500mA VOUT = 1.22V 0 –50 50 25 0 75 TEMPERATURE (°C) –25 100 –25 –50 125 –25 0 25 50 75 100 CBYP = 100pF LT1763 CBYP = 0.
PAGE 13
LT1763 Series TYPICAL PERFORMANCE CHARACTERISTICS 0.2 OUTPUT VOLTAGE DEVIATION (V) VIN = 6V CIN = 10μF COUT = 10μF 0.4 0 –0.2 –0.4 600 400 200 0 0 200 400 600 TIME (μs) 800 1000 1763 G56 VIN = 6V CIN = 10μF COUT = 10μF 0.10 0.05 0 –0.05 –0.10 LOAD CURRENT (mA) OUTPUT VOLTAGE DEVIATION (V) COUT = 10μF IL = 500mA 1763 G55 LOAD CURRENT (mA) VOUT 100μV/DIV 1ms/DIV LT1763-5 Transient Response CBYP = 0.01μF LT1763-5 Transient Response CBYP = 0 LT1763-5 10Hz to 100kHz Output Noise CBYP = 0.
PAGE 14
LT1763 Series PIN FUNCTIONS (DE12/S8) NC (Pins 1, 4, 9, 12) DE12 Only: No Connect. No connect pins have no connection to any internal circuitry. These pins may be tied to either GND or VIN , or left ﬂoating. OUT (Pins 2, 3/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.
PAGE 15
LT1763 Series APPLICATIONS INFORMATION The LT1763 series are 500mA low dropout regulators with micropower quiescent current and shutdown. The devices are capable of supplying 500mA 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 16
LT1763 Series APPLICATIONS INFORMATION 4.0 Output Capacitance and Transient Response Extra consideration must be given to the use of ceramic capacitors. Ceramic capacitors are manufactured with a variety of dielectrics, each with different behavior across temperature and applied voltage. The most common dielectrics used are speciﬁed with EIA temperature characteristic codes of Z5U, Y5V, X5R and X7R.
PAGE 17
LT1763 Series APPLICATIONS INFORMATION Y5V and Z5U capacitors, but can still be signiﬁcant enough to drop capacitor values below appropriate levels. Capacitor DC bias characteristics tend to improve as component case size increases, but expected capacitance at operating voltage should be veriﬁed. Thermal Considerations Voltage and temperature coefﬁcients are not the only sources of problems. Some ceramic capacitors have a piezoelectric response.
PAGE 18
LT1763 Series APPLICATIONS INFORMATION Protection Features Table 2. SO-8 Package, 8-Lead SO COPPER AREA TOPSIDE* BACKSIDE BOARD AREA THERMAL RESISTANCE (JUNCTION-TO-AMBIENT) 2500mm2 2500mm2 2500mm2 60°C/W 1000mm2 2500mm2 2500mm2 60°C/W 225mm2 2500mm2 2500mm2 68°C/W 100mm2 2500mm2 2500mm2 74°C/W 50mm2 2500mm2 2500mm2 86°C/W * Device is mounted on topside Calculating Junction Temperature Example: Given an output voltage of 3.
PAGE 19
LT1763 Series APPLICATIONS INFORMATION The top resistor of the resistor divider must be chosen to limit the current into the ADJ pin to less than 5mA when the ADJ pin is at 7V. The 13V difference between output and ADJ pin divided by the 5mA maximum current into the ADJ pin yields a minimum top resistor value of 2.6k. In circuits where a backup battery is required, several different input/output conditions can occur.
PAGE 20
LT1763 Series PACKAGE DESCRIPTION DE/UE Package 12-Lead Plastic DFN (4mm × 3mm) (Reference LTC DWG # 05-08-1695 Rev D) 4.00 p0.10 (2 SIDES) 7 0.70 p0.05 3.60 p0.05 2.20 p0.05 0.40 p 0.10 12 R = 0.05 TYP 3.30 p0.05 3.30 p0.10 3.00 p0.10 (2 SIDES) PIN 1 TOP MARK (NOTE 6) 1.70 p 0.05 R = 0.115 TYP 1.70 p 0.10 PIN 1 NOTCH R = 0.20 OR 0.35 s 45o CHAMFER PACKAGE OUTLINE 0.25 p 0.05 6 0.25 p 0.05 0.75 p0.05 0.200 REF 1 (UE12/DE12) DFN 0806 REV D 0.50 BSC 0.50 BSC 2.50 REF 2.50 REF 0.00 – 0.
PAGE 21
LT1763 Series REVISION HISTORY (Revision history begins at Rev G) REV DATE DESCRIPTION PAGE NUMBER G 5/10 Updated Order Information to add MP-grade to all versions of DFN package 2 to 4 Revised Line Regulation section of Electrical Characteristics 5 Consolidated GND and exposed pad descriptions in Pin Descriptions section 14 Added LT3085 to Related Parts 22 1763fg Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
PAGE 22
LT1763 Series TYPICAL APPLICATION Paralleling of Regulators for Higher Output Current R1 0.1Ω + VIN > 3.8V IN C1 10μF OUT SENSE LT1763-3.3 + C4 0.01μF SHDN BYP GND 3.3V 1A C2 10μF R2 0.1Ω IN OUT C5 0.01μF LT1763 SHDN R3 2.2k SHDN GND R4 2.2k 3 + BYP ADJ R7 1.21k 8 1/2 LT1490 2 – 4 R6 2k 1 R5 10k C3 0.01μF 1763 TA03 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1120 125mA Low Dropout Regulator with 20μA IQ Includes 2.