Datasheet

ManualsBrandsLINEAR TECHNOLOGY ManualsPMICsPMIC - LDO voltage regulator Positivbe, adjustable MSOP 10 EP

LT3023

3023fa

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

Dual 100mA,

Low Dropout, Low Noise,

Micropower Regulator

The LT

3023 is a dual, micropower, low noise, low drop-

out regulator. With an external 0.01μF bypass capacitor,

output noise drops to 20μV

RMS

over a 10Hz to 100kHz

bandwidth. Designed for use in battery-powered systems,

the low 20μA quiescent current per channel makes it an

ideal choice. In shutdown, quiescent current drops to less

than 0.1μA. Shutdown control is independent for each

channel, allowing for ﬂ exibility in power management. The

device is capable of operating over an input voltage from

1.8V to 20V, and can supply 100mA of output current from

each channel with a dropout voltage of 300mV. Quiescent

current is well controlled in dropout.

The LT3023 regulator is stable with output capacitors as

low as 1μF. 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 device is available as an adjust-

able device with a 1.22V reference voltage. The LT3023

regulator is available in the thermally enhanced 10-lead

MSOP and DFN packages.

Low Noise: 20μV

RMS

(10Hz to 100kHz)

Low Quiescent Current: 20μA/Channel

Wide Input Voltage Range: 1.8V to 20V

Output Current: 100mA/Channel

Very Low Shutdown Current: <0.1μA

Low Dropout Voltage: 300mV at 100mA

Adjustable Output from 1.22V to 20V

Stable with 1μF Output Capacitor

Stable with Aluminum, Tantalum or

Ceramic Capacitors

Reverse Battery Protected

No Reverse Current

No Protection Diodes Needed

Overcurrent and Overtemperature Protected

Thermally Enhanced 10-Lead MSOP and DFN

Packages

Cellular Phones

Pagers

Battery-Powered Systems

Frequency Synthesizers

Wireless Modems

L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other

trademarks are the property of their respective owners.

10Hz to 100kHz Output Noise

3.3V/2.5V Low Noise Regulators

SHDN2

0.01μF

10μF

3023 TA01

OUT1

3.7V TO

20V

BYP1

ADJ1

OUT2

BYP2

ADJ2

GND

LT3023

3.3V AT100mA

20μV

RMS

NOISE

2.5V AT100mA

20μV

RMS

NOISE

1μF

SHDN1

10μF

422k

249k

261k

249k

OUT

100μV/DIV

20μV

RMS

3023 TA01b

Summary of content (16 pages)

PAGE 1
LT3023 Dual 100mA, Low Dropout, Low Noise, Micropower Regulator FEATURES DESCRIPTION n The LT®3023 is a dual, micropower, low noise, low dropout regulator. With an external 0.01μF bypass capacitor, output noise drops to 20μVRMS over a 10Hz to 100kHz bandwidth. Designed for use in battery-powered systems, the low 20μA quiescent current per channel makes it an ideal choice. In shutdown, quiescent current drops to less than 0.1μA.
PAGE 2
LT3023 ABSOLUTE MAXIMUM RATINGS (Note 1) IN Pin Voltage .........................................................±20V OUT1, OUT2 Pin Voltage .........................................±20V Input to Output Differential Voltage .........................±20V ADJ1, ADJ2 Pin Voltage ............................................±7V BYP1, BYP2 Pin Voltage ........................................±0.6V SHDN1, SHDN2 Pin Voltage ...................................±20V Output Short-Circut Duration ......................
PAGE 3
LT3023 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 Line Regulation (Note 3) ΔVIN = 2V to 20V, ILOAD = 1mA l MIN Load Regulation (Note 3) VIN = 2.3V, ΔILOAD = 1mA to 100mA VIN = 2.
PAGE 4
LT3023 TYPICAL PERFORMANCE CHARACTERISTICS Guaranteed Dropout Voltage 500 450 450 350 TJ = 125°C 300 250 TJ = 25°C 200 150 = TEST POINTS 450 400 TJ ≤ 125°C 350 300 TJ ≤ 25°C 250 200 150 400 350 250 150 100 50 50 50 0 10 20 30 40 50 60 70 80 90 100 OUTPUT CURRENT (mA) 3023 G01 Quiescent Current ADJ1 or ADJ2 Pin Voltage VIN = 6V RL = 250k IL = 5μA ADJ PIN VOLTAGE (V) VSHDN = VIN 15 10 5 0 –50 0 –25 25 50 75 100 125 1.225 1.220 1.215 1.210 1.
PAGE 5
LT3023 TYPICAL PERFORMANCE CHARACTERISTICS SHDN1 or SHDN2 Pin Input Current 1.0 0.9 0.9 IL = 100mA 0.8 0.7 0.6 IL = 1mA 0.5 0.4 0.3 0.2 0.1 SHDN1 or SHDN2 Pin Input Current 1.4 VSHDN = 20V SHDN PIN INPUT CURRENT (μA) 1.0 SHDN PIN INPUT CURRENT (μA) SHDN PIN THRESHOLD (V) SHDN1 or SHDN2 Pin Threshold (Off-to-On) 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.
PAGE 6
LT3023 TYPICAL PERFORMANCE CHARACTERISTICS Input Ripple Rejection Input Ripple Rejection 70 60 CBYP = 1000pF 50 CBYP = 100pF 40 30 20 I = 100mA 10 VL = 2.3V + 50mV IN RMS RIPPLE COUT = 10μF 0 0.1 0.01 1 10 FREQUENCY (kHz) RIPPLE REJECTION (dB) CBYP = 0.01μF 70 RIPPLE REJECTION (dB) Channel-to-Channel Isolation 80 80 VOUT1 20mV/DIV 60 50 40 VOUT2 20mV/DIV 30 VIN = VOUT (NOMINAL) + 1V + 0.
PAGE 7
LT3023 TYPICAL PERFORMANCE CHARACTERISTICS RMS Output Noise vs Load Current (10Hz to 100kHz) 160 10Hz to 100kHz Output Noise CBYP = 100pF COUT = 10μF CBYP = 0μF CBYP = 0.01μF 120 VOUT SET FOR 5V VOUT 100μV/DIV VOUT 100μV/DIV 100 80 VOUT =VADJ 60 40 VOUT SET FOR 5V 20 3023 G28 1ms/DIV COUT = 10μF IL = 100mA VOUT SET FOR 5V OUT VOUT =VADJ 0.1 1 10 LOAD CURRENT (mA) 100 1ms/DIV COUT = 10μF IL = 100mA VOUT SET FOR 5V OUT 3023 G29 3023 G27 10Hz to 100kHz Output Noise CBYP = 0.
PAGE 8
LT3023 PIN FUNCTIONS GND (Pin 3): Ground. ADJ1/ADJ2 (Pins 4/2): Adjust Pin. These are the inputs to the error ampliﬁers. These pins are internally clamped to ± 7V. They have a bias current of 30nA which ﬂows into the pin (see curve of ADJ1/ADJ2 Pin Bias Current vs Temperature in the Typical Performance Characteristics section). The ADJ1 and ADJ2 pin voltage is 1.22V referenced to ground and the output voltage range is 1.22V to 20V. BYP1/BYP2 (Pins 5/1): Bypass.
PAGE 9
LT3023 APPLICATIONS INFORMATION The LT3023 is a dual 100mA low dropout regulator with micropower quiescent current and shutdown. The device is capable of supplying 100mA per channel 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 10
LT3023 APPLICATIONS INFORMATION The LT3023 regulator is designed to be stable with a wide range of output capacitors. The ESR of the output capacitor affects stability, most notably with small capacitors. A minimum output capacitor of 1μF with an ESR of 3Ω or less is recommended to prevent oscillations. The LT3023 is a micropower device and output transient response will be a function of output capacitance.
PAGE 11
LT3023 APPLICATIONS INFORMATION case size increases, but expected capacitance at operating voltage should be veriﬁed. 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 12
LT3023 APPLICATIONS INFORMATION Calculating Junction Temperature Example: Given an output voltage on the ﬁrst channel of 3.3V, an output voltage of 2.
PAGE 13
LT3023 APPLICATIONS INFORMATION In circuits where a backup battery is required, several different input/output conditions can occur. The output voltage may be held up while the input is either pulled to ground, pulled to some intermediate voltage or is left open circuit. Current ﬂow back into the output will follow the curve shown in Figure 6.
PAGE 14
LT3023 PACKAGE DESCRIPTION DD Package 10-Lead Plastic DFN (3mm × 3mm) (Reference LTC DWG # 05-08-1699) R = 0.115 TYP 6 0.38 ± 0.10 10 0.675 ±0.05 3.50 ±0.05 1.65 ±0.05 2.15 ±0.05 (2 SIDES) 3.00 ±0.10 (4 SIDES) PACKAGE OUTLINE 1.65 ± 0.10 (2 SIDES) PIN 1 TOP MARK (SEE NOTE 6) (DD) DFN 1103 5 0.25 ± 0.05 0.200 REF 0.50 BSC 2.38 ±0.05 (2 SIDES) 1 0.75 ±0.05 0.00 – 0.05 0.25 ± 0.05 0.50 BSC 2.38 ±0.10 (2 SIDES) BOTTOM VIEW—EXPOSED PAD RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS NOTE: 1.
PAGE 15
LT3023 PACKAGE DESCRIPTION MSE Package 10-Lead Plastic MSOP, Exposed Die Pad (Reference LTC DWG # 05-08-1664 Rev B) BOTTOM VIEW OF EXPOSED PAD OPTION 2.794 ± 0.102 (.110 ± .004) 5.23 (.206) MIN 0.889 ± 0.127 (.035 ± .005) 1 2.06 ± 0.102 (.081 ± .004) 1.83 ± 0.102 (.072 ± .004) 2.083 ± 0.102 3.20 – 3.45 (.082 ± .004) (.126 – .136) 10 0.50 0.305 ± 0.038 (.0197) (.0120 ± .0015) BSC TYP RECOMMENDED SOLDER PAD LAYOUT 3.00 ± 0.102 (.118 ± .004) (NOTE 3) 10 9 8 7 6 3.00 ± 0.102 (.118 ± .004) (NOTE 4) 4.
PAGE 16
LT3023 TYPICAL APPLICATION Startup Sequencing Turn-On Waveforms VIN 3.7V TO 20V VSHDN1 1V/DIV 10μF 0.01μF LT3023 1μF 3.3V AT 100mA OUT1 IN BYP1 422k 35.7k 249k 28k VOUT1 1V/DIV VOUT2 1V/DIV ADJ1 OFF ON SHDN1 OUT2 SHDN2 BYP2 10μF 0.01μF GND 0.47μF 2.5V AT 100mA 2ms/DIV 3023 TA03b Turn-Off Waveforms 261k ADJ2 249k VSHDN1 1V/DIV 3023 TA03a VOUT1 1V/DIV VOUT2 1V/DIV 2ms/DIV 3023 TA03c RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1129 700mA, Micropower, LDO VIN: 4.