Datasheet

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LT3032 Series

3032ff

For more information www.linear.com/LT3032

TYPICAL APPLICATION

FEATURES DESCRIPTION

Dual 150mA

Positive/Negative Low Noise

Low Dr

opout Linear Regulator

The LT

3032 is a dual, low noise, positive and negative low

dropout voltage linear regulator. Each regulator delivers

up to 150mA with a typical 300mV dropout voltage. Each

regulator’s quiescent current is low (30µA operating and

<3µA in shutdown) and well-controlled in dropout, making

it an excellent choice for battery-powered circuits.

Another key feature of the LT3032 is low output noise.

Adding an external 10nF bypass capacitor to each regulator

reduces output noise to 20µV

RMS/

30µV

RMS

over a 10Hz to

100kHz bandwidth. The LT3032 is stable with minimum

output capacitors of 2.2µF. The regulators do not require

the addition of ESR as is common with other regulators.

The regulators are offered as adjustable output devices with

an output voltage down to the ±1.22V reference voltage or

in fixed voltages of ±3.3V, ±5V, ±12V and ±15V. Internal

protection circuitry includes reverse-output protection,

current limiting and thermal limiting.

The LT3032 is available in a unique low profile 14-lead

4mm × 3mm × 0.75mm DFN package with exposed back-

side pads for each regulator, allowing optimum thermal

performance.

Dual Polarity Low Noise 150mA Power Supply

APPLICATIONS

Low Noise: 20µV

RMS

(Positive) and

30µV

RMS

(Negative)

Low Quiescent Current: 30µA/Channel

Wide Input Voltage Range: ±2.3V to ±20V

Output Current: ±150mA

Low Shutdown Current: <3µA Total (Typical)

Low Dropout Voltage: 300mV/Channel

Fixed Output Voltages: ±3.3V, ±5V, ±12V, ±15V

Adjustable Outputs from ±1.22V to ±20V

No Protection Diodes Needed

Stable with 2.2µF Output Capacitors

Stable with Ceramic, Tantalum or Aluminum Capacitors

Starts into Reverse Output Voltage

Current Limit and Thermal Limit

Low Profile 14-Lead 4mm × 3mm × 0.75mm

DFN Package

Battery-Powered Instruments

Bipolar Power Supplies

Low Noise Power Supplies

L, LT, LTC , LT M , Linear Technology and the Linear logo are registered trademarks and

ThinSOT is a trademark of Analog Devices, Inc. All other trademarks are the property of their

respective owners.

10µF

0.01µF

10µF

5.4V TO

20V

5V OUT AT 150mA

20µV

RMS

NOISE

–5V OUT AT –150mA

30µV

RMS

NOISE

–5.4V TO

–20V

<0.25V = OFF

>2V = ON

SHDNP

SHDNN

OUTPINP

INN

LT3032-5

BYPP

GND

BYPN

OUTN

3032 TA01

OUTP

100µV/DIV

OUTN

100µV/DIV

20µV

RMS

30µV

RMS

1mS/DIV

3032 TA02a

10Hz to 100kHz Output Noise

Downloaded from Arrow.com.

Summary of content (24 pages)

PAGE 1
LT3032 Series Dual 150mA Positive/Negative Low Noise Low Dropout Linear Regulator FEATURES n n n n n n n n n n n n n n DESCRIPTION Low Noise: 20µVRMS (Positive) and 30µVRMS (Negative) Low Quiescent Current: 30µA/Channel Wide Input Voltage Range: ±2.3V to ±20V Output Current: ±150mA Low Shutdown Current: <3µA Total (Typical) Low Dropout Voltage: 300mV/Channel Fixed Output Voltages: ±3.3V, ±5V, ±12V, ±15V Adjustable Outputs from ±1.22V to ±20V No Protection Diodes Needed Stable with 2.
PAGE 2
LT3032 Series ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) INP Pin Voltage........................................................±20V INN Pin Voltage........................................................±20V OUTP Pin Voltage....................................................±20V OUTN Pin Voltage (Note 3)......................................±20V INP Pin to OUTP Pin Differential Voltage.................±20V OUTN Pin to INN Pin Differential Voltage (Note 3).......................................
PAGE 3
LT3032 Series ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT3032EDE-15#PBF LT3032EDE-15#TRPBF 03215 14-Lead (4mm × 3mm) Plastic DFN –40°C to 125°C LT3032IDE-15#PBF LT3032IDE-15#TRPBF 03215 14-Lead (4mm × 3mm) Plastic DFN –40°C to 125°C LT3032MPDE-15#PBF LT3032MPDE-15#TRPBF 03215 14-Lead (4mm × 3mm) Plastic DFN –55°C to 125°C Consult LTC Marketing for parts specified with wider operating temperature ranges.
PAGE 4
LT3032 Series ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. PARAMETER Load Regulation (Notes 5, 13) CONDITIONS MIN TYP MAX UNITS LT3032-3.3 OUTP VINP = 4.3V, ΔILOAD = 1mA to 150mA –5 mV LT3032-3.3 OUTN VINN = –4.
PAGE 5
LT3032 Series ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. PARAMETER CONDITIONS Quiescent Current in Shutdown VINP = 6V, VSHDNP = 0V, VINN = 0V VINN = –6V, VSHDNN = 0V, VINP = 0V (LT3032, LT3032-3.3, LT3032-5) VINN = VOUT(NOMINAL) –1V, VSHDNN = 0V, VINP = 0V (LT3032-12/ LT3032-15) TYP MAX UNITS l l MIN 0.
PAGE 6
LT3032 Series TYPICAL PERFORMANCE CHARACTERISTICS INN-to-OUTN Typical Dropout Voltage INP-to-OUTP Dropout Voltage 500 500 450 450 450 400 400 350 TJ = 125°C 300 250 200 TJ = 25°C 150 100 300 250 150 100 50 0 40 60 80 100 120 140 160 LOAD CURRENT (mA) TJ = 25°C 200 0 20 TJ = 125°C 350 50 0 DROPOUT VOLTAGE (mV) 500 DROPOUT VOLTAGE (mV) DROPOUT VOLTAGE (mV) INP-to-OUTP Typical Dropout Voltage 400 350 IL = 150mA 300 250 IL = 50mA 200 IL = 10mA 150 IL = 1mA 100 50 –40 –80 –
PAGE 7
LT3032 Series TYPICAL PERFORMANCE CHARACTERISTICS LT3032-5 OUTN Output Voltage IL = –1mA IL = 1mA –5.025 –5.000 –4.975 –4.950 12.12 12.06 12.00 11.94 11.88 11.82 –4.925 –4.900 –50 –25 0 50 75 25 TEMPERATURE (°C) 100 0 –25 25 50 75 100 –12.00 –11.94 –11.88 125 –11.76 –50 LT3032-15 OUTP Output Voltage IL = 1mA 14.925 14.850 14.775 IL = –1mA –25 0 25 50 75 100 125 –15.150 –15.075 –15.000 –14.925 –14.850 0 –25 TEMPERATURE (°C) 25 50 75 100 1.220 1.215 1.210 125 1.
PAGE 8
LT3032 Series TYPICAL PERFORMANCE CHARACTERISTICS 250 200 150 VSHDNP = VINP 100 VSHDNP = 0V 50 0 2 4 6 8 10 12 14 16 18 20 INP VOLTAGE (V) TJ = 25°C RL = ∞ –50 VSHDNN = VINN –30 –20 –10 VSHDNN = 0V 0 –30 –20 VSHDNN = 0V –10 0 0 INP QUIESCENT CURRENT (µA) INN QUIESCENT CURRENT (µA) –40 250 VSHDNP = VINP 200 150 100 0 0 2 4 0 2 4 6 –30 6 –60 –50 8 10 12 14 16 18 20 INP VOLTAGE (V) VSHDNN = VINN –40 –30 –20 0 8 10 12 14 16 18 20 INP VOLTAGE (V) VSHDNN = 0V 0 –2 –4 –6 –8
PAGE 9
LT3032 Series TYPICAL PERFORMANCE CHARACTERISTICS –3.0 RL = 22Ω IL = 150mA* –2.0 –1.5 RL = 33Ω IL = –100mA* –1.0 RL = 66Ω IL = –50mA* –0.5 RL = 330Ω IL = –10mA* 0 –3.0 4.0 RL = 33.3Ω IL = 150mA* 3.5 3.0 2.5 RL = 50Ω IL = 100mA* 2.0 1.5 RL = 100Ω IL = 50mA* 0.5 0 0 1 2 3 3032 G75 TJ = 25°C VSHDNN = VINN *FOR VOUTN = –5V –2.5 1.0 –1 –2 –3 –4 –5 –6 –7 –8 –9 –10 INN VOLTAGE (V) LT3032-5 Negative Side GND Pin Current TJ = 25°C VINP = VSHDNP *FOR VOUTP = 5V 4.
PAGE 10
LT3032 Series TYPICAL PERFORMANCE CHARACTERISTICS Positive Side GND Pin Current vs ILOAD –4.0 VINP = VOUTP(NOMINAL) + 1V 4.5 T = 25°C J 4.0 3.0 2.5 2.0 1.5 1.0 0.9 –3.0 TJ = –50°C –2.5 –2.0 TJ = 25°C –1.5 TJ = 125°C –1.0 0.5 –0.5 0 0 20 VINN = VOUTN(NOMINAL) – 1V SHDNP PIN THRESHOLD (V) 3.5 0 SHDNP Pin Threshold 1.0 –3.5 GND PIN CURRENT (mA) GND PIN CURRENT (mA) 5.0 Negative Side GND Pin Current vs ILOAD 40 60 80 100 120 140 160 POSITIVE LOAD CURRENT (mA) IL = 1mA 0.8 ON 0.7 0.
PAGE 11
LT3032 Series TYPICAL PERFORMANCE CHARACTERISTICS ADJN Pin Bias Current Positive Side Current Limit Positive Side Current Limit 500 –60 –50 –40 –30 –20 –10 0 –50 –25 0 25 50 75 TEMPERATURE (°C) 100 VOUTP = 0V 450 400 350 300 250 200 150 100 50 0 125 500 POSITIVE SIDE CURRENT LIMIT (mA) POSITIVE SIDE CURRENT LIMIT (mA) ADJN PIN BIAS CURRENT (nA) –70 0 VINP = 7V VOUTP = 0V 450 400 350 300 250 200 150 100 50 0 –50 7 4 3 2 5 6 1 INP-TO-OUTP DIFFERENTIAL VOLTAGE (V) 50 25 0 75 TEMPERATURE (°C)
PAGE 12
LT3032 Series TYPICAL PERFORMANCE CHARACTERISTICS INN-to-OUTN Ripple Rejection INP-to-OUTP Ripple Rejection 60 50 40 COUTN = 10µF 30 20 10 0 COUTN = 1µF 10 100 1k 10k FREQUENCY (Hz) 100k 66 64 62 60 58 56 54 52 –50 1M INN-TO-OUTN RIPPLE REJECTION (dB) IL = –150mA VINN = VOUTN(NOMINAL) – 1.5V + 50mVRMS RIPPLE CBYPN = 0 70 INN-to-OUTN Ripple Rejection 60 68 INP-TO-OUTP RIPPLE REJECTION (dB) INN-TO-OUTN RIPPLE REJECTION (dB) 80 VINP = VOUTP(NOMINAL) + 1.5V + 0.
PAGE 13
LT3032 Series TYPICAL PERFORMANCE CHARACTERISTICS 350 LT3032-15 200 LT3032-12 150 LT3032-5 100 LT3032-3.3 50 100 1k 10k LT3032-15 LT3032-12 200 150 LT3032-5 100 LT3032-3.3 LT3032 0.1 1 10 100 LOAD CURRENT (mA) OUTN RMS Noise vs Load Current (10Hz to 100kHz) CBYPN = 0 CBYPN = 0.01µF LT3032-15 LT3032-12 LT3032-5 LT3032-3.3 LT3032 OUTN RMS NOISE (µVRMS) 120 100 80 60 LT3032-12 150 100 50 LT3032-5 0 1k LT3032-3.
PAGE 14
LT3032 Series TYPICAL PERFORMANCE CHARACTERISTICS 0.02 0 –0.02 –0.04 VOUTN = –5V VINN = –6V CINN = 10µF COUTN = 10µF 0.2 OUTN VOLTAGE DEVIATION (V) VOUTP = 5V VINP = 6V CINP = 10µF COUTP = 10µF 0.04 OUTP VOLTAGE DEVIATION (V) OUTN Transient Response CBYPN = 0 0.1 0 50 0 0 40 80 120 TIME (µs) 160 200 VOUTN = –5V VINN = –6V CINN = 10µF COUTN = 10µF 0.04 0.02 0 –0.04 –0.2 –0.06 LOAD CURRENT (mA) LOAD CURRENT (mA) LOAD CURRENT (mA) 100 OUTN Transient Response CBYPN = 0.01µF –0.02 –0.
PAGE 15
LT3032 Series PIN FUNCTIONS OUTN (Pin 7): Negative Output. This output supplies power to the negative side load. A minimum output capacitor of 1µF is required to prevent oscillations. Larger output capacitors are required for applications with large tran sient loads to limit peak voltage transients. A parasitic diode exists between OUTN and INN; OUTN can not be pulled more negative than INN during normal operation, or more than 0.5V below INN during a fault condition.
PAGE 16
LT3032 Series APPLICATIONS INFORMATION The LT3032 is a dual 150mA positive and negative low noise low dropout linear regulator with micropower quiescent current and shutdown. It supplies ±150mA at a dropout of 300mV. Output voltage noise can be lowered on the positive side to 20µVRMS and to 30µVRMS on the negative side over the 10Hz to 100kHz bandwidth with the addition of 0.01µF reference bypass capacitors.
PAGE 17
LT3032 Series APPLICATIONS INFORMATION 25°C during normal operation where the BYPN pin operates at approximately –60mV. DC leakages on the order of 1µA into or out of these pins can throw off the internal reference by 20% or more. Output Capacitance and Transient Response The LT3032 requires output capacitors for stability. It is designed to be stable with most low ESR capacitors (typically ceramic, tantalum or low ESR electrolytic). A minimum output capacitor of 2.
PAGE 18
LT3032 Series APPLICATIONS INFORMATION 20 Stability and Input Capacitance BOTH CAPACITORS ARE 16V, 1210 CASE SIZE, 10µF 0 CHANGE IN VALUE (%) X5R –20 –40 –60 Y5V –80 –100 0 2 4 8 6 10 12 DC BIAS VOLTAGE (V) 14 16 3032 F03 Figure 3. Ceramic Capacitor DC Bias Characteristics 40 CHANGE IN VALUE (%) 20 The self-inductance, or isolated inductance, of a wire is directly proportional to its length. Wire diameter is not a major factor on its self-inductance.
PAGE 19
LT3032 Series APPLICATIONS INFORMATION If wiring modifications are not permissible for the applications, including series resistance between the power supply and the input of the LT3032 also stabilizes the application. As little as 0.1Ω to 0.5Ω, often less, is effective in damping the LC resonance. If the added impedance between the power supply and the input is unacceptable, adding ESR to the input capacitor also provides the necessary damping of the LC resonance.
PAGE 20
LT3032 Series APPLICATIONS INFORMATION Calculating Junction Temperature Protection Features Example: Given a positive output voltage of 3.3V, a positive input voltage of 4V to 6V, output current range from 10mA to 150mA, negative output voltage of –3.
PAGE 21
LT3032 Series APPLICATIONS INFORMATION In situations where the ADJP pin is connected to a resistor divider that would pull the ADJP pin above its 7V clamp voltage if the output is pulled high, the ADJP pin input current must be limited to less than 5mA. For example, a resistor divider is used to provide a 1.5V output from the 1.22V reference and the output is forced to 20V. The top resistor of the divider must be chosen to limit the current into the ADJP pin to less than 5mA when the ADJP pin is at 7V.
PAGE 22
LT3032 Series PACKAGE DESCRIPTION Please refer to http://www.linear.com/product/LT3032#packaging/ for the most recent package drawings. DE14MA Package 14-Lead Plastic DFN (4mm × 3mm) (Reference LTC DWG # 05-08-1731 Rev C) 1.78 ±0.05 0.70 ±0.05 0.10 TYP 0.51 TYP 3.50 ±0.05 1.65 ± 0.05 2.10 ±0.05 0.78 ±0.05 0.88 ±0.05 1.65 ± 0.05 1.07 ±0.05 PACKAGE OUTLINE 0.25 ± 0.05 0.50 BSC 3.00 REF RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED 4.00 ±0.
PAGE 23
LT3032 Series REVISION HISTORY REV DATE DESCRIPTION A 08/10 Updated all applicable sections to add fixed voltage ±5V option. PAGE NUMBER B 01/11 Swapped OUTN and INN pins in Absolute Maximum Ratings. Revised values in SHDNN and SHDNP descriptions in Pin Functions. Revised quiescent current for the positive side up to 25µA in Applications Information. C 09/11 Updated to add 12V and 15V options. D 03/12 Added MP-Grade to Order Information and Absolute Maximum Ratings. E 08/14 Added ±3.
PAGE 24
LT3032 Series TYPICAL APPLICATION ±5V to ±15V Tracking Supply 5.5V TO 20V OUTP INP LT3032 0.01µF 536k 5V TO 15V AT 150mA 10µF BYPP OFF ON SHDNP ADJP 95.3k GND SHDNN 250k ADJN BYPN 0.01µF –5.5V TO –20V INN 536k OUTN 10µF –5V TO –15V AT –150mA 3032 TA02 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1175 800mA Negative Low Dropout Micropower Regulator VIN: –4.5V to -20V, IQ = 45μA, 0.