Datasheet

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LT3030

3030fa

For more information www.linear.com/LT3030

Typical applicaTion

FeaTures DescripTion

Dual 750mA/250mA

Low Dropout, Low Noise,

Micropower Linear Regulator

The LT

3030 is a dual, micropower, low noise, low dropout

linear regulator. The device operates with either common

or independent input supplies for each channel, over a

1.7V to 20V input voltage range. Output 1/Output 2 supply

750mA/250mA respectively with a typical dropout voltage

of 300mV. With an external 10nF bypass capacitor, output

noise is only 20μV

RMS

over a 10Hz to 100kHz bandwidth.

Designed for use in battery-powered systems, the low

120μA/75μA quiescent current makes it an ideal choice.

In shutdown, quiescent current drops to less than 1μA.

Shutdown control is independent for each channel and

its precision logic threshold allows for voltage lockout

functionality. The LT3030 includes a PWRGD flag for each

channel to indicate output regulation.

The LT3030 optimizes stability and transient response with

low ESR ceramic output capacitors, requiring a minimum

of only 10μF/3.3μF.

Internal circuitry provides reverse-battery protection,

reverse-current protection, current limiting with foldback

and thermal shutdown with hysteresis. The adjustable

output voltage device has a 1.220V reference voltage.

The LT3030 is offered in the thermally enhanced 20-lead

TSSOP and 28-lead, low profile (4mm

× 5mm × 0.75mm)

QFN packages.

2.5V

to 1.8V/1.5V Application

applicaTions

Output Current: 750mA/250mA

Low Dropout Voltage: 300mV

Low Noise: 20μV

RMS

(10Hz to 100kHz)

Low Quiescent Current: 120μA/75μA

Wide Input Voltage Range: 1.7V to 20V

Adjustable Output: 1.220V Reference Voltage

Shutdown Quiescent Current: <1μA

Stable with 10µF/3.3µF Minimum Output Capacitor

Stable with Ceramic, Tantalum or Aluminum

Electrolytic Capacitors

Precision Threshold for Shutdown Logic or UVLO Function

PWRGD Flag for each Output

Reverse Battery and Reverse Output-to-Input

Protection

Current Limit with Foldback and Thermal Shutdown

Thermally Enhanced 20-Lead TSSOP and

28-Lead (4mm × 5mm) QFN Packages

General Purpose Linear Regulator

Battery-Powered Systems

Microprocessor Core/Logic Supplies

Post Regulator for Switching Supplies

Tracking/Sequencing Power Supplies

Dropout Voltage vs Load Current

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.

OUTPUT CURRENT (mA)

DROPOUT VOLTAGE (mV)

500

450

400

350

300

250

200

150

100

450150

3030 TA01b

750

300 60037575 675225 525

OUT1

= 25°C

OUT2

LT3030

GND

IN1

IN2

SHDN1

SHDN2

PWRGD1

PWRGD2

OUT1

BYP1

ADJ1

OUT2

BYP2

ADJ2

3.3µF

10µF

3.3µF

10nF

3030 TA01a

2.5V

OUT1

1.8V

750mA

OUT2

1.5V

250mA

113k

237k

10nF

54.9k

237k

Summary of content (22 pages)

PAGE 1
LT3030 Dual 750mA/250mA Low Dropout, Low Noise, Micropower Linear Regulator Description Features n n n n n n n n n n n n n n Output Current: 750mA/250mA Low Dropout Voltage: 300mV Low Noise: 20μVRMS (10Hz to 100kHz) Low Quiescent Current: 120μA/75μA Wide Input Voltage Range: 1.7V to 20V Adjustable Output: 1.220V Reference Voltage Shutdown Quiescent Current: <1μA Stable with 10µF/3.
PAGE 2
LT3030 Absolute Maximum Ratings (Note 1) IN1, IN2 Pin Voltage.................................................±22V OUT1, OUT2 Pin Voltage..........................................±22V Input-to-Output Differential Voltage.........................±22V ADJ1, ADJ2 Pin Voltage.............................................±9V BYP1, BYP2 Pin Voltage.........................................±0.6V SHDN1, SHDN2 Pin Voltage.....................................±22V PWRGD1, PWRGD2 Pin Voltage.....................22V, –0.
PAGE 3
LT3030 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 Minimum Input Voltage (Notes 3, 11) Output 1, ILOAD = 750mA Output 2, ILOAD = 250mA l l ADJ1, ADJ2 Pin Voltage (Notes 3, 4) VIN = 2V, ILOAD = 1mA Output 1, 2.2V < VIN1 < 20V, 1mA < ILOAD < 750mA Output 2, 2.
PAGE 4
LT3030 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 Ripple Rejection VIN = 2.72V (Avg), VRIPPLE = 0.5VP-P, fRIPPLE = 120Hz, ILOAD = Full Current (Note 13) MIN TYP 50 60 dB 50 dB VIN = VOUT(NOMINAL) + 1V, VRIPPLE = 50mVRMS fRIPPLE = 1MHz, ILOAD = Full Current (Note 13) MAX UNITS Output 1, VIN1 = 6V, VOUT1 = 0V VIN1 = 2.2V, ∆VOUT1 = –0.1V l l 1.
PAGE 5
LT3030 Typical Performance Characteristics 450 TJ = 150°C TJ = 25°C 250 200 TJ = –55°C 150 100 50 0 0 TJ = 25°C 300 250 200 150 100 50 0 75 150 225 300 375 450 525 600 675 750 OUTPUT CURRENT (mA) TJ = 150°C 350 0 3030 G01 450 450 TJ = 150°C TJ = 125°C TJ = 25°C 250 200 TJ = –55°C 150 100 50 0 0 GUARANTEED DROPOUT VOLTAGE (mV) DROPOUT VOLTAGE (mV) 500 300 25 50 75 100 125 150 175 200 225 250 OUTPUT CURRENT (mA) = TEST POINTS 150 100 500 250 200 150 100 50 400 350 300 250 200 15
PAGE 6
LT3030 Typical Performance Characteristics Quiescent Current in Shutdown (per Output) 0.7 0.6 0.5 0.4 0.3 0.2 IL1 = 100mA 1.5 0 2 4 1.2 0.9 0.6 0 6 8 10 12 14 16 18 20 INPUT VOLTAGE (V) IL1 = 10mA 0 1 2 IL1 = 1mA 3 4 5 6 INPUT VOLTAGE (V) 7 GND PIN CURRENT (mA) GND PIN CURRENT (mA) 15 12 9 6 3 IL2 = 25mA 0.4 IL2 = 10mA IL2 = 1mA SHDN PIN THRESHOLD (V) GND PIN CURRENT (mA) 1.
PAGE 7
LT3030 Typical Performance Characteristics 150 1.8 135 1.6 120 1.4 1.2 VIN = 2.2V, VSHDN = 20V 1.0 0.8 0.6 0.4 VIN = 20V VSHDN = 2.2V 0.2 105 90 75 60 45 30 15 0 –75 –50 –25 0 25 50 75 100 125 150 175 TEMPERATURE (°C) 0 –75 –50 –25 0 25 50 75 100 125 150 175 TEMPERATURE (°C) 3030 G19 60 45 30 1.25 TJ = –55°C 1.00 TJ = 25°C 0.75 TJ = 125°C 0 0 –75 –50 –25 0 25 50 75 100 125 150 175 TEMPERATURE (°C) TJ = 150°C 0.48 0.48 0.42 0.42 TJ = 125°C 0.18 0.12 TJ = 150°C 0 2 4 2 4 1.
PAGE 8
LT3030 Typical Performance Characteristics Reverse Current REVERSE CURRENT (µA) 400 VIN1 = VIN2 = 0V VADJ1 = VOUT1 = 1.220V VADJ2 = VOUT2 = 1.220V 350 300 250 200 IADJ1 OR IADJ2 IOUT1 150 100 IOUT2 50 0 –75 –25 0 25 50 75 100 125 150 175 TEMPERATURE (°C) OUT1 Input Ripple Rejection 100 100 90 90 80 80 70 RIPPLE REJECTION (dB) 450 OUT1 Input Ripple Rejection RIPPLE REJECTION (dB) 500 TJ = 25°C, unless otherwise noted.
PAGE 9
LT3030 Typical Performance Characteristics ∆IL = 1mA TO FULL LOAD 4 6 4 2 0 –2 –4 ∆VIN = 2V TO 20V 2 1 0 –1 –2 –6 –3 –8 –4 –10 –75 –50 –25 0 25 50 75 100 125 150 175 TEMPERATURE (°C) –5 –75 –50 –25 0 25 50 75 100 125 150 175 TEMPERATURE (°C) 3030 G37 VOUT = 5V CBYP = 100pF VOUT = VADJ 0.1 CBYP = 0.01µF 0.1 140 1 10 FREQUENCY (Hz) 120 OUTPUT2 OUTPUT1 100 80 60 VOUT = 1.220V 40 OUTPUT1 100 0 10 0.
PAGE 10
LT3030 Typical Performance Characteristics 10Hz to 100kHz Output Noise, CBYP = 0pF OUT1 or OUT2 Minimum Input Voltage 2.50 MINIMUM INPUT VOLTAGE (V) 2.25 10Hz to 100kHz Output Noise, CBYP = 100pF VOUT1 = VOUT2 = 1.220V 2.00 IL = FULL LOAD 1.75 1.50 TJ = 25°C, unless otherwise noted. VOUT 100µV/DIV IL = 1mA 1.25 VOUT 100µV/DIV 1.00 0.75 0.50 COUT = 10µF IL = FULL LOAD VOUT = 5V 0.
PAGE 11
LT3030 Pin Functions (QFN/TSSOP) OUT1, OUT2 (Pins 1, 2, 7, 8/Pins 3, 4, 7, 8): Output. The OUT1/OUT2 pins supply power to the loads. A minimum 10μF/3.3μF output capacitor prevents oscillations on OUT1/OUT2. Applications with large output load transients require larger values of output capacitance to limit peak voltage transients. See the Applications Information section for more on output capacitance and on reverse output characteristics.
PAGE 12
LT3030 Applications Information The LT3030 is a dual 750mA/250mA low dropout regulator with independent inputs, micropower quiescent current and shutdown. The device supplies up to 750mA/250mA from the outputs of channel 1/channel 2 at a typical dropout voltage of 300mV. The two regulators share common GND pins and are thermally coupled. However, the two inputs and outputs of the LT3030 operate independently.
PAGE 13
LT3030 Applications Information Input Capacitance and Stability Each LT3030 channel is stable with an input capacitor typically between 1µF and 10µF. Applications operating with smaller VIN to VOUT differential voltages and that experience large load transients may require a higher input capacitor value to prevent input voltage droop and letting the regulator enter dropout. Very low ESR ceramic capacitors may be used.
PAGE 14
LT3030 Applications Information capacitor values below appropriate levels. Capacitor DC bias characteristics tend to improve as case size increases. Linear Technology recommends verifying expected versus actual capacitance values at operating voltage in situ for an application. 20 BOTH CAPACITORS ARE 16V, 1210 CASE SIZE, 10µF CHANGE IN VALUE (%) 0 X5R –20 –40 –60 Y5V Shutdown/UVLO –80 –100 0 2 4 14 8 6 10 12 DC BIAS VOLTAGE (V) 16 3030 F02 Figure 2.
PAGE 15
LT3030 Applications Information 1. Output current multiplied by the input/output voltage differential: (IOUT)(VIN – VOUT), and 2.GND pin current multiplied by the input voltage: (IGND)(VIN). Table 3.
PAGE 16
LT3030 Applications Information TJMAX = 50°C + 24.6°C = 74.6°C Protection Features The LT3030 regulator incorporates several protection features that make it 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 device protects itself against reverse input voltages and reverse voltages from output to input.
PAGE 17
LT3030 Applications Information drops to less than 2μA. This occurs if the IN pin is connected to a discharged (low voltage) battery, and either a backup battery or a second regulator circuit holds up the output. The state of that channel’s SHDN pin has no effect on the reverse output current if the output is pulled above the input. Overload Recovery Like many IC power regulators, the LT3030 has safe operating area (SOA) protection.
PAGE 18
LT3030 Typical Applications Coincident Tracking Supply Application 3.3V 0.1µF OFF ON ON GATE LTC2923 RAMP RAMPBUF 113k 1% 90.9k 1% VCC TRACK1 IN1 1M 3.3µF LT3030 10nF PWRGD1 BYP1 SHDN1 ADJ1 FB2 3.3µF IN2 OUT2 10nF 1M PWRGD2 GND BYP2 SHDN2 113k 1% 10µF VOUT1 1.8V 750mA 237k 1% SDO 2.5V TRACK2 OUT1 1M FB1 54.9k 1% 63.4k 1% CGATE 0.1µF ADJ2 54.9k 1% VOUT2 1.5V 3.
PAGE 19
LT3030 Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. UFD Package 28-Lead (4mm × 5mm) Plastic QFN (Reference LTC DWG # 05-08-1712 Rev B) 0.70 ±0.05 4.50 ± 0.05 3.10 ± 0.05 2.50 REF 2.65 ± 0.05 3.65 ± 0.05 PACKAGE OUTLINE 0.25 ±0.05 0.50 BSC 3.50 REF 4.10 ± 0.05 5.50 ± 0.05 RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED 4.00 ± 0.10 (2 SIDES) 0.75 ± 0.05 R = 0.
PAGE 20
LT3030 Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. FE Package 20-Lead Plastic TSSOP (4.4mm) (Reference LTC DWG # 05-08-1663 Rev J) FE Package 20-Lead Plastic TSSOP (4.4mm) Exposed Pad Variation CB (Reference LTC DWG # 05-08-1663 Rev J) Exposed Pad Variation CB 6.40 – 6.60* (.252 – .260) 3.86 (.152) 3.86 (.152) 20 1918 17 16 15 14 13 12 11 6.60 ±0.10 2.74 (.108) 4.50 ±0.10 6.40 2.74 (.252) (.108) BSC SEE NOTE 4 0.45 ±0.
PAGE 21
LT3030 Revision History REV DATE DESCRIPTION A 6/13 Lowered VIN minimum to 1.7V PAGE NUMBER 1 Added H-grade in QFN package 2 Modified OUT2 GND curve pin current graph labels 6 3030fa 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 22
LT3030 Typical Application Sequencing Supply Application VIN1 3.3V LT3030 1µF 1M OUT1 IN1 VIN2 2.5V 1µF 10nF SHDN1 BYP1 PWRGD1 ADJ1 IN2 OUT2 10nF BYP2 SHDN2 22µF VOUT2 1V/DIV 237k 1% 1M PWRGD2 113k 1% VOUT1 1.8V 750mA 54.9k 1% 10µF VOUT2 1.5V 250mA ADJ2 VOUT1 1V/DIV VSHDN1 5V/DIV 10ms/DIV 3030 TA03b 237k 1% GND 3030 TA03a Related Parts PART NUMBER DESCRIPTION COMMENTS LT1761 100mA, Low Noise Micropower LDO VIN: 1.8V to 20V, VOUT = 1.22V, VDO = 0.