Datasheet

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LT3015 Series

3015fb

The LT

3015 series are low noise, low dropout, negative

linear regulators with fast transient response. The devices

supply up to 1.5A of output current at a typical dropout

voltage of 310mV. Operating quiescent current is typically

1.1mA and drops to < 1µA in shutdown. Quiescent current

is also well controlled in dropout. In addition to fast tran-

sient response, the LT3015 series exhibit very low output

noise, making them ideal for noise sensitive applications.

The LT3015 regulators are stable with a minimum 10µF

output capacitor. Moreover, the regulator can use small

ceramic capacitors without the necessary addition of ESR

as is common with other regulators. Internal protection

circuitry includes reverse output protection, precision cur-

rent limit with foldback and thermal limit with hysteresis.

The LT3015 regulators are available in fixed output volt-

ages of –2.5V, –3V, –3.3V, –5V, –12V and –15V and as an

adjustable device with a –1.22V reference voltage. Pack-

ages include the 5-lead TO-220 and DD-Pak, a thermally

enhanced 12-lead MSOP and the low profile (0.75 mm)

8-lead 3mm × 3mm DFN.

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.

TYPICAL APPLICATION

FEATURES DESCRIPTION

1.5A, Low Noise,

Negative Linear Regulator

with Precision Current Limit

–5V, –1.5A, Low Noise Regulator

APPLICATIONS

Output Current: 1.5A

Dropout Voltage: 310mV

Precision Current Limit with Foldback

Low Output Noise: 60µV

RMS

(10Hz to 100kHz)

Low Quiescent Current: 1.1mA

Precision Positive or Negative Shutdown Logic

Fast Transient Response

Wide Input Voltage Range: –1.8V to –30V

Adjustable Output Voltage Range: –1.22V to –29.3V

Fixed Output Voltages: –2.5V, –3V, –3.3V, –5V, –12V, –15V

Controlled Quiescent Current in Dropout

<1µA Quiescent Current in Shutdown

Stable with 10µF Output Capacitor

Stable with Ceramic, Tantalum or Aluminum Capacitors

Thermal Limit with Hysteresis

Reverse Output Protection

5-Lead TO-220 and DD-Pak, Thermally Enhanced

12-Lead MSOP and 8-Lead 3mm × 3mm × 0.75mm

DFN Packages

Post-Regulator for Switching Supplies

Negative Logic Supplies

Low Noise Instrumentation

Industrial Supplies

Negative Complement to the LT1963A

GND

SENSE

OUT

SHDN

LT3015-5

10µF

OUT

–5V

–1.5A

–5.5V TO

–30V

3015 TA01

Dropout Voltage

LOAD CURRENT (A)

DROPOUT VOLTAGE (mV)

400

350

300

250

200

150

100

450

–0.8 –1.0 –1.2 –1.4 –1.6–0.2 –0.4

3015 TA01a

–0.6

= 25°C

DD-PAK/TO-220

DFN/MSOP

Summary of content (26 pages)

PAGE 1
LT3015 Series 1.5A, Low Noise, Negative Linear Regulator with Precision Current Limit DESCRIPTION FEATURES n n n n n n n n n n n n n n n n n Output Current: 1.5A Dropout Voltage: 310mV Precision Current Limit with Foldback Low Output Noise: 60µVRMS (10Hz to 100kHz) Low Quiescent Current: 1.1mA Precision Positive or Negative Shutdown Logic Fast Transient Response Wide Input Voltage Range: –1.8V to –30V Adjustable Output Voltage Range: –1.22V to –29.3V Fixed Output Voltages: –2.5V, –3V, –3.
PAGE 2
LT3015 Series ABSOLUTE MAXIMUM RATINGS (Note 1) IN Pin Voltage..........................................................±33V OUT Pin Voltage (Note 10).......................................±33V OUT to IN Differential Voltage (Note 10).........–0.3V, 33V SENSE Pin Voltage (with Respect to IN Pin) (Note 10)..................–0.3V, 33V ADJ Pin Voltage (with Respect to IN Pin) (Note 10)..................–0.3V, 33V SHDN Pin Voltage (with Respect to IN Pin) (Note 10)..................–0.
PAGE 3
LT3015 Series ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT3015EDD#PBF LT3015EDD#TRPBF LFXS 8-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C LT3015IDD#PBF LT3015IDD#TRPBF LFXS 8-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C LT3015EDD-2.5#PBF LT3015EDD-2.5#TRPBF LGDJ 8-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C LT3015IDD-2.5#PBF LT3015IDD-2.
PAGE 4
LT3015 Series ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT3015EQ#PBF LT3015EQ#TRPBF LT3015Q 5-Lead Plastic DD-Pak –40°C to 125°C LT3015IQ#PBF LT3015IQ#TRPBF LT3015Q 5-Lead Plastic DD-Pak –40°C to 125°C LT3015MPQ#PBF LT3015MPQ#TRPBF LT3015Q 5-Lead Plastic DD-Pak –55°C to 125°C LT3015EQ-2.5#PBF LT3015EQ-2.5#TRPBF LT3015Q-2.5 5-Lead Plastic DD-Pak –40°C to 125°C LT3015IQ-2.5#PBF LT3015IQ-2.5#TRPBF LT3015Q-2.
PAGE 5
LT3015 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 Minimum IN Pin Voltage (Notes 2, 12) ILOAD = –0.5A ILOAD = –1.5A Regulated Output Voltage (Note 3) LT3015-2.5: VIN = –3.0V, ILOAD = –1mA LT3015-2.5: –30V < VIN < –3.5V, –1.5A < ILOAD < –1mA LT3015-3: VIN = –3.5, ILOAD = –1mA LT3015-3: –30V < VIN < –4 V, –1.5A < ILOAD < –1mA LT3015-3.3: VIN = –3.
PAGE 6
LT3015 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 MIN TYP MAX UNITS ADJ Pin Bias Current (Notes 2, 7) LT3015: VIN = –2.3V –200 30 200 nA Shutdown Threshold (Note 11) VOUT = Off-to-On (Positive) VOUT = Off-to-On (Negative) VOUT = On-to-Off (Positive) VOUT = On-to-Off (Negative) l l l l 1.07 –1.34 0.5 1.21 –1.2 0.73 –0.73 1.35 –1.06 –0.
PAGE 7
LT3015 Series TYPICAL PERFORMANCE CHARACTERISTICS Typical Dropout Voltage (DFN/MSOP) Guaranteed Dropout Voltage (DFN/MSOP) 450 450 250 200 150 125°C 25°C –40°C –55°C 100 50 0 TJ ≤ 125°C 400 300 TJ ≤ 25°C 200 0 –0.2 –0.4 –0.6 –0.8 –1 –1.2 –1.4 –1.6 OUTPUT CURRENT (A) 200 150 50 –0.2 –0.4 –0.6 –0.8 –1 –1.2 –1.4 –1.6 OUTPUT CURRENT (A) 125°C 25°C –40°C –55°C 100 Dropout Voltage (DD-PAK/TO-220) 600 500 400 TJ ≤ 25°C 300 200 0 400 300 IL = –0.
PAGE 8
LT3015 Series TYPICAL PERFORMANCE CHARACTERISTICS LT3015-3 Output Voltage LT3015-3.3 Output Voltage –3.366 VIN = –3.5V IL = –1mA –3.048 –3.342 OUTPUT VOLTAGE (V) –3.012 –3.000 –2.988 –2.976 –5.06 –3.330 –3.318 –3.306 –3.294 –3.282 –3.270 –5.04 –5.02 –5.00 –4.98 –4.96 –4.94 –2.964 –3.258 –2.952 –3.246 –4.92 –2.940 –75 –50 –25 0 25 50 75 100 125 150 175 TEMPERATURE (°C) –3.234 –75 –50 –25 0 25 50 75 100 125 150 175 TEMPERATURE (°C) –4.
PAGE 9
LT3015 Series TYPICAL PERFORMANCE CHARACTERISTICS LT3015-12 Quiescent Current LT3015-5 Quiescent Current –1.8 VSHDN = VIN –0.9 –0.6 –0.3 –1.5 VSHDN = VIN –1.2 –0.9 –0.6 –0.3 VSHDN = 0V 0 –3 –6 –9 –12 –15 –18 –21 –24 –27 –30 INPUT VOLTAGE (V) 0 –10 RL = 2.4Ω IL = –0.5A* RL = 12Ω IL = –0.1A* –5 0 0 RL = 1.2kΩ IL = –1mA* –40 –35 –30 RL = 25Ω IL = –0.1A* –25 –20 –15 RL = 5Ω IL = –0.5A* –10 0 –1 –2 –3 –4 –5 –6 –7 –8 –9 –10 INPUT VOLTAGE (V) RL = 2.5kΩ IL = –1mA* –30 RL = 33Ω IL = –0.
PAGE 10
LT3015 Series TYPICAL PERFORMANCE CHARACTERISTICS TJ = 25°C VSHDN = VIN *FOR VOUT = –15V –40 –35 RL = 10Ω IL = –1.5A* –30 –25 RL = 150Ω IL = –0.1A* –20 RL = 15kΩ IL = –1mA* –15 –10 RL = 30Ω IL = –0.5A* 0 TJ = –55°C –25 TJ = –40°C –20 –15 –10 TJ = 25°C TJ = 125°C 0 0.0 –0.2 –0.4 –0.6 –0.8 –1.0 –1.2 –1.4 –1.6 OUTPUT CURRENT (A) –2 –4 –6 –8 –10 –12 –14 –16 –18 –20 INPUT VOLTAGE (V) 20 TURN OFF THRESHOLD –0.6 –0.4 –0.2 VIN = –2.3V 0 –75 –50 –25 0 25 50 75 100 125 150 175 TEMPERATURE (°C) 0.
PAGE 11
LT3015 Series TYPICAL PERFORMANCE CHARACTERISTICS Load Regulation LT3015-5 LT3015-12 LT3015-15 –1.8 –40 –30 –20 –1.6 –1.4 –1.2 –1.0 –0.8 –0.6 0.0 LT3015 Input Ripple Rejection 0 –5 –10 –15 –20 –25 INPUT/OUTPUT DIFFERENTIAL (V) COUT = 47µF –0.8 –0.6 RIPPLE REJECTION (dB) 40 30 20 10M 40 30 20 TJ = 25°C I = –1.5A 10 L VOUT = –5V VIN = –6.
PAGE 12
LT3015 Series TYPICAL PERFORMANCE CHARACTERISTICS 250 LT3015 10Hz to 100kHz Output Noise RMS Output Noise vs Feedforward Capacitor (CFF) LT3015 10Hz to 100kHz Output Noise, CFF = 0 IL = –1.5A COUT = 10µF f = 10Hz TO 100kHz IFB-DIVIDER = 100µA TJ = 25°C 225 200 OUTPUT NOISE (µVRMS) TA = 25°C, unless otherwise noted. 175 150 VOUT 200µV/DIV VOUT 100µV/DIV 125 100 VOUT = –5V 75 VOUT = –1.22V 50 25 0 10p 100p 1n 10n 100n FEEDFORWARD CAPACITANCE, CFF (F) COUT = 10µF VOUT = –1.22V IL = –1.
PAGE 13
LT3015 Series TYPICAL PERFORMANCE CHARACTERISTICS LT3015 Transient Response, COUT = 47µF TA = 25°C, unless otherwise noted. LT3015 Transient Response, CFF = 0, COUT = 10µF VOUT 100mV/DIV VOUT 100mV/DIV IOUT 1A/DIV IOUT 1A/DIV COUT = 47µF 25µs/DIV VOUT = –1.22V VIN = –3V ∆IOUT = –50mA TO –1.5A 3015 G55 COUT = 10µF 25µs/DIV VOUT = –5V VIN = –6.5V CFF = 0 IFB-DIVIDER = 100µA ∆IOUT = –50mA TO –1.
PAGE 14
LT3015 Series PIN FUNCTIONS (DFN/MSOP/Q/T) IN (Pins 1, 2, Exposed Pad Pin 9 / 1, 2, 3, 4, Exposed Pad Pin 13 / 3, Tab / 3, Tab ): Input. These pins supply power to the regulator. The Tab of the DD-Pak, TO-220 and the exposed backside pad of the DFN and MSOP packages is an electrical connection to IN and to the device’s substrate. For proper electrical and thermal performance, tie all IN pins together and tie IN to the exposed backside or Tab of the relevant package on the PCB.
PAGE 15
LT3015 Series BLOCK DIAGRAM SENSE *SEE TABLE 1 FOR NOMINAL VALUES OF R1 AND R2 1.21V OUT ADJ R2* – VREF _ ERROR AMP R1* + + QPOWER NPN DRIVER SHDN BIAS CIRCUITRY + – I LIMIT AMP RSNS – + VTH + – –1.20V ADJ PIN BIAS CURRENT COMPENSATION GND I LIMIT FOLDBACK IN 3015 BD APPLICATIONS INFORMATION The LT3015 series are 1.5A negative low dropout linear regulators featuring precision current limit and precision bi-directional shutdown. The device supplies up to 1.
PAGE 16
LT3015 Series APPLICATIONS INFORMATION Table 1 shows 1% resistor divider values for some common output voltages with a resistor divider current of approximately 100µA. to –1.22V output voltage performance regardless of the chosen output voltage (see Transient Response and Output Noise in the Typical Performance Characteristics section). Table 1. Output Voltage Resistor Divider Values R1 VOUT (V) (kΩ) It is important to note that the start-up time is affected by the use of a feedforward capacitor.
PAGE 17
LT3015 Series APPLICATIONS INFORMATION When used with a 5V regulator, a 16V 10μF Y5V capacitor can exhibit an effective value as low as 1μF to 2μF for the DC bias voltage applied and over the operating temperature range. The X5R and X7R dielectrics result in more stable characteristics and are more suitable for use as the output capacitor. The X7R type has better stability across temperature, while the X5R is less expensive and is available in higher values.
PAGE 18
LT3015 Series APPLICATIONS INFORMATION The problem occurs with a heavy output load when input voltage is high and output voltage is low. Such situations occur easily after the removal of a short-circuit or if the shutdown pin is pulled high after the input voltage has already been turned on. The load line for such a load intersects the output current curve at two points. If this happens, the regulator has two stable output operating points.
PAGE 19
LT3015 Series APPLICATIONS INFORMATION Table 2. Measured Thermal Resistance for DFN Package COPPER AREA TOP SIDE* BACKSIDE BOARD AREA THERMAL RESISTANCE (JUNCTION-TO-AMBIENT) 2500mm2 2500mm2 2500mm2 40°C/W 1000mm2 2500mm2 2500mm2 40°C/W 225mm2 2500mm2 2500mm2 41°C/W 100mm2 2500mm2 2500mm2 42°C/W *Device is mounted on topside P = –500mA(–3.465V + 2.5V) + –6.5mA • (–3.465V) = 0.
PAGE 20
LT3015 Series TYPICAL APPLICATIONS Adjustable Current Sink R1 2k C1 10µF LT1004-1.2 R3 2k VIN < –2.3V R8 100k GND R2 82.5k C2 10µF LT3015 R4 0.01Ω R5 2.2k SHDN ADJ IN OUT R6 2.2k C3 1µF 2 3 – + R7 475Ω 8 1/2 LT1350 C4 3.3µF RLOAD 1 4 3015 TA04 NOTE: ADJUST R3 FOR 0 TO –1.
PAGE 21
LT3015 Series PACKAGE DESCRIPTION Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. DD Package 8-Lead Plastic DFN (3mm × 3mm) (Reference LTC DWG # 05-08-1698 Rev C) 0.70 ±0.05 3.5 ±0.05 1.65 ±0.05 2.10 ±0.05 (2 SIDES) PACKAGE OUTLINE 0.25 ±0.05 0.50 BSC 2.38 ±0.05 RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED PIN 1 TOP MARK (NOTE 6) 0.200 REF 3.00 ±0.10 (4 SIDES) R = 0.125 TYP 5 0.40 ±0.10 8 1.65 ±0.
PAGE 22
LT3015 Series PACKAGE DESCRIPTION Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. MSE Package 12-Lead Plastic MSOP, Exposed Die Pad (Reference LTC DWG # 05-08-1666 Rev F) BOTTOM VIEW OF EXPOSED PAD OPTION 2.845 ±0.102 (.112 ±.004) 5.23 (.206) MIN 2.845 ±0.102 (.112 ±.004) 0.889 ±0.127 (.035 ±.005) 6 1 1.651 ±0.102 (.065 ±.004) 1.651 ±0.102 3.20 – 3.45 (.065 ±.004) (.126 – .136) 12 0.65 0.42 ±0.038 (.0256) (.0165 ±.
PAGE 23
LT3015 Series PACKAGE DESCRIPTION Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. Q Package 5-Lead Plastic DD Pak (Reference LTC DWG # 05-08-1461 Rev F) .256 (6.502) .060 (1.524) TYP .060 (1.524) .390 – .415 (9.906 – 10.541) .165 – .180 (4.191 – 4.572) .045 – .055 (1.143 – 1.397) 15° TYP .060 (1.524) .183 (4.648) +.008 .004 –.004 +0.203 0.102 –0.102 .059 (1.499) TYP .330 – .370 (8.382 – 9.398) ( ) .095 – .115 (2.413 – 2.921) .075 (1.
PAGE 24
LT3015 Series PACKAGE DESCRIPTION Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. T Package 5-Lead Plastic TO-220 (Standard) (Reference LTC DWG # 05-08-1421) .390 – .415 (9.906 – 10.541) .165 – .180 (4.191 – 4.572) .147 – .155 (3.734 – 3.937) DIA .045 – .055 (1.143 – 1.397) .230 – .270 (5.842 – 6.858) .460 – .500 (11.684 – 12.700) .570 – .620 (14.478 – 15.748) .330 – .370 (8.382 – 9.398) .700 – .728 (17.78 – 18.491) .620 (15.
PAGE 25
LT3015 Series REVISION HISTORY REV DATE DESCRIPTION A 12/11 Revised entire data sheet to include fixed output voltages. PAGE NUMBER B 4/12 Clarified conditions of “RMS Output Noise vs Load Current” graph 1 - 26 11 3015fb Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use.
PAGE 26
LT3015 Series TYPICAL APPLICATION Paralleling Regulators For Higher Output Current C1 22µF SHDN R1 0.01Ω VIN < –5.5V R9 12.1k 1% GND ADJ R8 37.4k 1% LT3015 IN OUT R6 41.2k 1% LT3015 IN VOUT –5V –3.0A R7 12.1k 1% GND SHDN ADJ R2 0.01Ω C2 22µF OUT R5 50k C3 0.01µF R3 2.2k R4 2.2k 2 3 – + 8 1/2 LT1366 1 4 3015 TA03 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1185 3A, Negative Linear Regulator 670mV Dropout Voltage, VIN = –4.