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LT3032 Series

3032fd

TYPICAL APPLICATION

FEATURES DESCRIPTION

Dual 150mA

Positive/Negative Low Noise

Low Dropout 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 volt-

age or in ﬁ xed voltages of ±5V, ±12V and ±15V. Internal

protection circuitry includes reverse-output protection,

current limiting and thermal limiting.

The LT3032 is available in a unique low proﬁ le 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: ±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 Proﬁ le 14-Lead 4mm × 3mm × 0.75mm

DFN Package

Battery-Powered Instruments

Bipolar Power Supplies

Low Noise Power Supplies

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.

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

Summary of content (24 pages)

PAGE 1
LT3032 Series Dual 150mA Positive/Negative Low Noise Low Dropout Linear Regulator FEATURES DESCRIPTION n 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.
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 BASED FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT3032EDE LT3032EDE#TR 3032 14-Lead (4mm × 3mm) Plastic DFN –40°C to 125°C LT3032IDE LT3032IDE#TR 3032 14-Lead (4mm × 3mm) Plastic DFN –40°C to 125°C LT3032MPDE LT3032MPDE#TR 3032 14-Lead (4mm × 3mm) Plastic DFN –55°C to 125°C LT3032EDE-5 LT3032EDE-5#TR 30325 14-Lead (4mm × 3mm) Plastic DFN –40°C to 125°C LT3032IDE-5 LT3032IDE-5#TR 30325 14-Lead (4mm × 3mm) Plastic
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.
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 Output Voltage Noise (10Hz to 100kHz) COUTP = 10μF, CBYPP 0.01μF, ILOAD = 150mA COUTN = 10μF, CBYPN 0.01μF, ILOAD = –150mA Ripple Rejection VRIPPLE = 0.5VP-P, fRIPPLE = 120Hz VINP to VOUTP = 1.5V (Average), ILOAD = 100mA VINN to VOUTN = –1.
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 DROPOUT VOLTAGE (mV) 500 DROPOUT VOLTAGE (mV) DROPOUT VOLTAGE (mV) INP-to-OUTP Typical Dropout Voltage TJ = 125°C 350 300 250 TJ = 25°C 200 150 400 350 250 IL = 50mA 200 IL = 10mA 150 100 100 100 50 50 50 0 0 0 20 40 60 80 100 120 140 160 LOAD CURRENT (mA) –40 –80 –120 LOAD CURRENT (mA)
PAGE 7
LT3032 Series TYPICAL PERFORMANCE CHARACTERISTICS LT3032-12 OUTN Output Voltage LT3032-15 OUTP Output Voltage –12.24 IL = –1mA –15.300 IL = 1mA –12.12 –12.06 –12.00 –11.94 –11.88 –11.82 15.150 15.075 15.000 14.925 14.850 14.775 –11.76 –50 –25 0 25 50 75 100 0 –25 TEMPERATURE (°C) 25 50 75 –15.075 –15.000 –14.925 –14.850 100 125 –14.700 –50 LT3032 ADJP Pin Voltage IL = 1mA 1.215 1.210 1.205 IL = –1mA 0 25 50 75 100 125 TJ = 25°C RL = ∞ 350 –1.230 –1.225 –1.220 –1.215 –1.
PAGE 8
LT3032 Series TYPICAL PERFORMANCE CHARACTERISTICS LT3032-15 INP Quiescent Current LT3032-15 INN Quiescent Current TJ = 25°C RL = ∞ 300 250 VSHDNP = VINP 200 150 100 50 30 TJ = 25°C RL = ∞ –70 INN QUIESCENT CURRENT (μA) INP QUIESCENT CURRENT (μA) 350 –60 –50 VSHDNN = VINN –40 –30 –20 VSHDNN = 0V –10 VSHDNP = 0V 0 0 2 4 6 8 10 12 14 16 18 20 INP VOLTAGE (V) 0 5.0 –15 –10 0 2 4 6 8 10 12 14 16 18 20 INP VOLTAGE (V) –3.0 4.0 RL = 33.3Ω IL = 150mA* 3.5 3.0 2.
PAGE 9
LT3032 Series TYPICAL PERFORMANCE CHARACTERISTICS LT3032-15 Negative Side GND Pin Current –3.0 RL = 300Ω, *IL = 50mA 0 3.5 3.0 RL = 12.2Ω IL = 100mA* 2.5 2.0 RL = 24.4Ω IL = 50mA* 1.5 TJ = 25°C; VSHDNN = VINN; *FOR VOUTN = –1.22V –2.5 RL = 8.07Ω IL = 150mA* 1.0 RL = 8.07Ω IL = –150mA* –2.0 RL = 12.2Ω IL = –100mA* –1.5 –1.0 RL = 24.4Ω IL = –50mA* –0.5 RL = 122Ω IL = –10mA* 0.5 RL = 1.5k, *IL = –10mA 0 4.0 GND PIN CURRENT (mA) –1.
PAGE 10
LT3032 Series TYPICAL PERFORMANCE CHARACTERISTICS SHDNN Pin Input Current SHDNN Pin Input Current 4 2 0 –2 –4 –6 –8 –10 –10 –8 –6 –4 –2 0 2 4 6 SHDNN PIN VOLTAGE (V) 8 140 VINN = –15V POSITIVE CURRENT FLOWS INTO THE PIN 9 6 VSHDNN = 15V 3 0 VSHDNN = –15V –3 120 100 80 60 40 20 –6 –9 –50 10 ADJP PIN BIAS CURRENT (nA) 6 SHDNN PIN INPUT CURRENT (μA) TJ = 25°C POSITIVE CURRENT FLOWS INTO THE PIN 8 SHDNN PIN INPUT CURRENT (μA) ADJP Pin Bias Current 12 10 –25 0 25 50 75 TEMPERATURE (°C) 100
PAGE 11
LT3032 Series TYPICAL PERFORMANCE CHARACTERISTICS Reverse OUTP Pin Current 35 30 INP-TO-OUTP RIPPLE REJECTION (dB) VINP = 0V VOUTP = VADJP =1.22V (LT3032) VOUTP = 5V (LT3032-5) VOUTP = 12V (LT3032-12) VOUTP = 15V (LT3032-15) 40 REVERSE OUTP CURRENT (μA) INP-to-OUTP Ripple Rejection 25 (LT3032-12/LT3032-15) 20 15 10 (LT3032-5) 5 70 60 50 COUTP = 10μF 40 30 IL = 150mA VINP = VOUTP(NOMINAL) + 1.5V + 50mVRMS RIPPLE CBYPP = 0 20 10 (LT3032) 0 –50 COUTP = 2.
PAGE 12
LT3032 Series TYPICAL PERFORMANCE CHARACTERISTICS OUTP Noise Spectral Density 10 OUTP NOISE SPECTRAL DENSITY (μV/√Hz) VINN = VOUTN(NOMINAL) – 1V IL = –1mA TO –150mA LOAD REGULATION (mV) 50 40 LT3032-12 30 LT3032-15 LT3032-5 20 10 LT3032 0 –50 –25 0 25 50 75 TEMPERATURE (°C) 100 COUTP = 10μF IL = 150mA CBYPP = 0.01μF 1 CBYPP = 1000pF CBYPP = 100pF 0.1 0.
PAGE 13
LT3032 Series TYPICAL PERFORMANCE CHARACTERISTICS OUTN, 10Hz to 100kHz Output Noise, CBYPN = 0 OUTP Transient Response CBYPP = 0 OUTN, 10Hz to 100kHz Output Noise, CBYPN = 0.01μF 0.3 VOUTP = 5V VINP = 6V CINP = 10μF COUTP = 10μF OUTP VOLTAGE DEVIATION (V) 0.2 VOUTN 100μV/DIV VOUTN 200μV/DIV 0.1 0 –0.1 –0.2 COUTN = 10μF ILOAD = –150mA VOUTN = –5V 3032 G46 1ms/DIV COUTN = 10μF ILOAD = –150mA VOUTN = –5V 3032 G47 1ms/DIV LOAD CURRENT (mA) –0.
PAGE 14
LT3032 Series PIN FUNCTIONS OUTP (Pin 1): Positive Output. This output supplies power to the positive side load. A minimum output capacitor of 2.2μF is required to prevent oscillations. Larger output capacitors are required for applications with large transient loads to limit peak voltage transients. See the Applications Information section for more information on output capacitance, bypass capacitance, and reverse output characteristics. ADJP (Pin 2, Adjustable Part Only): Positive Adjust.
PAGE 15
LT3032 Series PIN FUNCTIONS BYPN (Pin 11): Negative Bypass. The BYPN pin is used to bypass the reference of the negative side regulator to achieve low noise performance. A small capacitor from OUTN to this pin will bypass the reference to lower the output voltage noise. A maximum value of 0.01μF is used for reducing output voltage noise to a typical 30μVRMS over the 10Hz to 100kHz bandwidth. If not used, this pin must be left unconnected. SHDNP (Pin 12): Positive Shutdown.
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/designtools/packaging/ for the most recent package drawings. DE14MA Package 14-Lead Plastic DFN (4mm × 3mm) (Reference LTC DWG # 05-08-1731 Rev A) 1.78 p0.05 0.70 p0.05 0.10 TYP 0.51 TYP 3.50 p0.05 1.65 p 0.05 2.10 p0.05 1.07 p0.05 1.65 p 0.05 PACKAGE OUTLINE 0.25 p 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 p0.10 (2 SIDES) R = 0.05 TYP 3.00 p0.
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.
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 SHDNP OFF ON ADJP 95.3k GND SHDNN 250k ADJN BYPN 0.01μF –5.5V TO –20V OUTN 536k 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.