LT3015 LINER [Linear Technology], LT3015 Datasheet

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LT3015

Manufacturer Part Number
LT3015
Description
1.5A, Low Noise, Negative Linear Regulator
Manufacturer
LINER [Linear Technology]
Datasheet

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FEATURES
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APPLICATIONS
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TYPICAL APPLICATION
Output Current: 1.5A
Dropout Voltage: 310mV
Precision Current Limit with Foldback
Low Output Noise: 60µV
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
–5.5V TO
–30V
V
IN
–5V, –1.5A, Low Noise Regulator
10µF
SHDN
IN
LT3015-5
GND
RMS
SENSE
3015 TA01
OUT
(10Hz to 100kHz)
10µF
V
–5V
–1.5A
OUT
with Precision Current Limit
DESCRIPTION
The LT
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.
Negative Linear Regulator
®
3015 series are low noise, low dropout, negative
450
400
350
300
250
200
150
100
50
0
0
T
J
= 25°C
–0.2 –0.4
DD-PAK/TO-220
Dropout Voltage
1.5A, Low Noise,
LOAD CURRENT (A)
–0.6
–0.8 –1.0 –1.2 –1.4 –1.6
DFN/MSOP
LT3015 Series
3015 TA01a
3015fb
1

Related parts for LT3015

LT3015 Summary of contents

Page 1

... 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 ...

Page 2

... GND GND MSE PACKAGE 12-LEAD PLASTIC MSOP T = 125° 37°C/ 10°C/W JMAX JA JC EXPOSED PAD (PIN 13) IS IN, MUST BE SOLDERED TO PCB *PIN 8 = SENSE FOR LT3015-2.5/-3/-3.3/-5/-12/-15 *PIN 8 = ADJ FOR LT3015 FRONT VIEW 5 OUT 4 SENSE/ADJ GND 1 SHDN T PACKAGE 5-LEAD PLASTIC TO-220 T = 125° ...

Page 3

... Plastic MSOP 301515 12-Lead Plastic MSOP 301515 12-Lead Plastic MSOP 301515 12-Lead Plastic MSOP LT3015 Series TEMPERATURE RANGE –40°C to 125°C –40°C to 125°C –40°C to 125°C –40°C to 125°C –40°C to 125°C –40°C to 125°C – ...

Page 4

... LT3015 Series ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL LT3015EQ#PBF LT3015EQ#TRPBF LT3015IQ#PBF LT3015IQ#TRPBF LT3015MPQ#PBF LT3015MPQ#TRPBF LT3015EQ-2.5#PBF LT3015EQ-2.5#TRPBF LT3015IQ-2.5#PBF LT3015IQ-2.5#TRPBF LT3015MPQ-2.5#PBF LT3015MPQ-2.5#TRPBF LT3015EQ-3#PBF LT3015EQ-3#TRPBF LT3015IQ-3#PBF LT3015IQ-3#TRPBF LT3015MPQ-3#PBF LT3015MPQ-3#TRPBF LT3015EQ-3.3#PBF LT3015EQ-3 ...

Page 5

... IN OUT(NOMINAL) LOAD I = –100mA LOAD I = –500mA LOAD I = –1.5A LOAD Output Voltage Noise (Note 2) LT3015: C SENSE Pin Bias Current (Note 13) LT3015-2.5/-3/-3.3/-5/-12/-15 The denotes the specifications which apply over the full operating l = 25° –3.0V –1mA IN LOAD < –3.5V, –1.5A < I < –1mA IN LOAD = –3. – ...

Page 6

... Note 12: For LT3015, the minimum input voltage refers to the lowest input voltage before the parts goes out of regulation. For the fixed voltage versions of LT3015, the minimum input voltage refers to the lowest input voltage before the part can no longer sink 1.5A; for proper regulation, the dropout voltage requirements must be met ...

Page 7

... T ≤ 25°C J 300 200 100 = TEST POINTS 0 0 –0.2 –0.4 –0.6 –0.8 –1 –1.2 –1.4 –1.6 OUTPUT CURRENT (A) 3015 G05 LT3015 ADJ Pin Voltage –1.244 V = –2.3V IN –1.238 I = –1mA L –1.232 –1.226 –1.220 –1.214 –1.208 –1.202 – ...

Page 8

... TEMPERATURE (°C) 3015 G14 LT3015-3 Quiescent Current –2 25° –3V –2.1 OUT R = ∞ L –1.8 –1 SHDN IN –1.2 –0.9 – ...

Page 9

... V SHDN IN –1.2 –0.9 –0.6 –0 SHDN 0 0 –3 –6 –9 –12 –15 –18 –21 –24 –27 –30 INPUT VOLTAGE (V) 3015 G21 LT3015-3 GND Pin Current – 25°C J – SHDN IN *FOR V = –3V OUT –40 – –1.5A* L – ...

Page 10

... Line Regulation –20.0 LT3015 LT3015-5 LT3015-2.5 LT3015-12 –17.5 LT3015-3 LT3015-15 LT3015-3.3 –15.0 –12.5 –10.0 –7.5 –5.0 –2.5 0.0 –75 –50 – 100 125 150 175 TEMPERATURE (°C) 3015 G36 ∆ –0.5V TO –30V IN OUT(NOMINAL) (LT3015-2.5/-3/-3.3/-5/-12/-15) ∆V = –2.3V TO –30V (LT3015 –1mA L 3015fb ...

Page 11

... OUT –2.2 –2.0 –1.8 –1.6 –1.4 –1.2 –1.0 –0.8 –0.6 –0.4 –0 OUT 0.0 0 –5 –10 –15 –20 –25 INPUT/OUTPUT DIFFERENTIAL (V) LT3015 Input Ripple Rejection 47µF, C OUT 10µF, C OUT 10µF, C OUT 25° –1.5A ...

Page 12

... V = –5V 0.1 OUT V = –3V OUT 0. –1.22V OUT 0.001 100p 1n 10n FEEDFORWARD CAPACITOR 25°C, unless otherwise noted. A LT3015 10Hz to 100kHz Output Noise OUT 200µV/DIV 3015 G47 C = 10µF 1ms/DIV OUT V = –5V OUT I = –1. SHDN Transient Response – ...

Page 13

... OUT 100mV/DIV I OUT 1A/DIV 3015 G55 C = 10µF OUT V = –5V OUT V = –6. 100µA FB-DIVIDER ∆I = –50mA TO –1.5A OUT LT3015 Transient Response 10nF , OUT 100mV/DIV I OUT 1A/DIV 3015 G57 C = 47µF OUT V = –5V OUT V = –6. 10nF 100µA FB-DIVIDER ∆ ...

Page 14

... OFF if the SHDN pin is pulled typically within ±0.73V of GND. Driving the SHDN pin typically more than ±1.21V turns the LT3015 ON. Drive the SHDN pin with either a logic gate or with open collector/drain logic using a pull-up resistor. The resistor supplies the pull-up current of the open collector/drain gate, typically several microamperes. The typical SHDN pin current is 2.8µ ...

Page 15

... In dual supply applications where the regu- lator’s load is returned to a positive supply, OUT can be pulled above GND by 30V and still allow the LT3015 to start up and operate. Adjustable Operation The LT3015 adjustable version has an output voltage range of – ...

Page 16

... OUT ADJ Response, Low Noise, and High PSRR Output Capacitance and Transient Performance The LT3015 regulators are stable with a wide range of output capacitors. The ESR of the output capacitor affects when the output RMS stability, most notably with small capacitors. Use a mini- mum output capacitor of 10µ ...

Page 17

... Similar vibration induced behavior can masquerade as increased output voltage noise. Figure 6. Noise Resulting from Tapping on a Ceramic Capacitor Overload Recovery Like many IC power regulators, the LT3015 has safe oper ating area protection. The safe operating area protection ...

Page 18

... Shutdown/UVLO The SHDN pin is used to put the LT3015 into a micro power shutdown state. The LT3015 has an accurate –1.20V threshold (during turn-on) on the SHDN pin. This threshold ...

Page 19

... Precision current limit and thermal overload protections 14°C/W are intended to protect the LT3015 against current over- 16°C/W load conditions at the output of the device. For normal 19°C/W operation, do not allow the the junction temperature to exceed 125° ...

Page 20

... LT3015 Series TYPICAL APPLICATIONS C1 10µF V < –2.3V IN NOTE: ADJUST R3 FOR 0 TO –1.5A CONSTANT CURRENT 20 Adjustable Current Sink R1 GND 2k R2 LT3015 82.5k LT1004-1.2 SHDN 0. 2.2k 2. – 1/2 LT1350 3.3µF 3015 TA04 R8 100k C2 10µF ADJ R LOAD OUT R7 C3 475 1µ ...

Page 21

... ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON TOP AND BOTTOM OF PACKAGE LT3015 Series R = 0.125 0.40 ±0.10 TYP 5 8 ...

Page 22

... LT3015 Series PACKAGE DESCRIPTION Please refer to http://www.linear.com/designtools/packaging/ 2.845 ±0.102 (.112 ±.004) 5.23 (.206) MIN 0.42 ±0.038 (.0165 ±.0015) TYP RECOMMENDED SOLDER PAD LAYOUT DETAIL “A” 0.254 (.010) GAUGE PLANE 0.18 (.007) NOTE: 1. DIMENSIONS IN MILLIMETER/(INCH) 2. DRAWING NOT TO SCALE 3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006" ...

Page 23

... TYP .080 .350 .205 .585 .320 .090 .067 .042 RECOMMENDED SOLDER PAD LAYOUT FOR THICKER SOLDER PASTE APPLICATIONS LT3015 Series .165 – .180 (4.191 – 4.572) .045 – .055 (1.143 – 1.397) +.008 .004 –.004 .059 ( (1.499) +0.203 ...

Page 24

... LT3015 Series PACKAGE DESCRIPTION Please refer to http://www.linear.com/designtools/packaging/ .390 – .415 (9.906 – 10.541) .460 – .500 (11.684 – 12.700) .067 BSC (1.70) (0.711 – 0.965) 24 for the most recent package drawings. T Package 5-Lead Plastic TO-220 (Standard) (Reference LTC DWG # 05-08-1421) .147 – .155 (3.734 – ...

Page 25

... Clarified conditions of “RMS Output Noise vs Load Current” graph 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 representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. LT3015 Series PAGE NUMBER ...

Page 26

... LT3015 Series TYPICAL APPLICATION V < –5.5V IN RELATED PARTS PART NUMBER DESCRIPTION LT1185 3A, Negative Linear Regulator LT1175 500mA, Negative Low Dropout Micropower Regulator LT1964 200mA, Negative Low Noise Low Dropout Regulator LT1764A 3A, Fast Transient Response, Low Noise LDO Regulator LT1763 500mA, Low Noise, LDO Regulator LT1963A 1 ...

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