Datasheet

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LT6660

6660fa

CHANGE IN V

OUT

(%)

–0.09

DISTRIBUTION (%)

6660 TA01b

0.09

–0.05

0.01–0.01 0.05

Tiny Micropower

Precision Series References

in 2mm × 2mm DFN

The LT

6660 is a family of micropower series references

that combine high accuracy and low drift with low power

dissipation and extremely small package size. These se-

ries references use curvature compensation to obtain

low temperature coefﬁcient, and laser trimmed precision

thin-ﬁlm resistors to achieve high output accuracy. The

LT6660 will supply up to 20mA with excellent line regula-

tion characteristics, making it ideal for precision regulator

applications.

The LT6660 family of series references provide supply

current and power dissipation advantages over shunt

references that must idle the entire load current to oper-

ate. Additionally, the LT6660 does not require an output

compensation capacitor. This feature is important in

applications where PC board space is a premium, fast set-

tling is demanded, or total capacitance must be kept to a

minimum, as in intrinsic safety applications. Reverse-bat-

tery protection keeps these references from conducting

reverse current.

■

Handheld Instruments

■

Precision Regulators

■

A/D and D/A Converters

■

Power Supplies

■

Hard Disk Drives

■

Sensor Modules

■

No Output Capacitor Required

■

Low Drift: 20ppm/°C Max

■

High Accuracy: 0.2% Max

■

Low Supply Current

■

20mA Output Current Guaranteed

■

Reverse-Battery Protection

■

Low IR Reﬂow Induced Stress: 0.02% Typ

■

Voltage Options: 2.5V, 3V, 3.3V, 5V and 10V

■

Space-Saving Alternative to the LT1460

■

3-Lead 2mm × 2mm × 0.75mm DFN Package

APPLICATIO S

FEATURES

DESCRIPTIO

TYPICAL APPLICATIO

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

Basic Connection

LT6660

GND

OUT

+ 0.9V ≤ V

≤ 20V

6660 TA01

0.1µF

OUT

LT6660H V

OUT

Shift Due to IR Reﬂow

Summary of content (12 pages)

PAGE 1
LT6660 Tiny Micropower Precision Series References in 2mm × 2mm DFN DESCRIPTIO FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ U ■ No Output Capacitor Required Low Drift: 20ppm/°C Max High Accuracy: 0.2% Max Low Supply Current 20mA Output Current Guaranteed Reverse-Battery Protection Low IR Reﬂow Induced Stress: 0.02% Typ Voltage Options: 2.5V, 3V, 3.3V, 5V and 10V Space-Saving Alternative to the LT1460 3-Lead 2mm × 2mm × 0.
PAGE 2
LT6660 AXI U RATI GS U W W W ABSOLUTE (Note 1) Input Voltage.............................................................30V Reverse Voltage ......................................................–15V Output Short-Circuit Duration, TA = 25°C ................5 sec Speciﬁed Temperature Range ...................... 0°C to 70°C Operating Temperature Range (Note 2) ............................................... –40°C to 85°C Storage Temperature Range (Note 3).....
PAGE 3
LT6660 AVAILABLE OPTIONS OUTPUT VOLTAGE (V) SPECIFIED TEMPERATURE RANGE ACCURACY (%) TEMPERATURE COEFFICIENT (ppm/°C) PART ORDER NUMBER 5 5 5 0°C to 70°C 0°C to 70°C 0°C to 70°C 0.2 0.4 0.5 20 20 50 LT6660HCDC-5 LT6660JCDC-5 LT6660KCDC-5 10 10 10 0°C to 70°C 0°C to 70°C 0°C to 70°C 0.2 0.4 0.
PAGE 4
LT6660 ELECTRICAL CHARACTERISTICS Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The LT6660 is guaranteed functional over the operating temperature range of –40°C to 85°C. Note 3: If the parts are stored outside of the speciﬁed temperature range, the output may shift due to hysteresis.
PAGE 5
LT6660 TYPICAL PERFOR A CE CHARACTERISTICS U W Characteristic curves are similar for all voltage options of the LT6660. Curves from the LT6660-2.5 and the LT6660-10 represent the extremes of the voltage options. Characteristic curves for other output voltages fall between these curves, and can be estimated based on their voltage output. 2.5V Output Voltage Temperature Drift THREE TYPICAL PARTS 2.502 2.501 2.500 2.499 2.501 25°C 200 SUPPLY CURRENT (µA) OUTPUT VOLTAGE (V) 2.5V Line Regulation 2.
PAGE 6
LT6660 TYPICAL PERFOR A CE CHARACTERISTICS U W Characteristic curves are similar for all voltage options of the LT6660. Curves from the LT6660-2.5 and the LT6660-10 represent the extremes of the voltage options. Characteristic curves for other output voltages fall between these curves, and can be estimated based on their voltage output. 10V Minimum Input-Output Voltage Differential 10V Load Regulation, Sourcing 25°C – 55°C 30 25 20 15 10 5 – 55°C 0 –5 0 0.5 1.0 1.5 2.
PAGE 7
LT6660 TYPICAL PERFOR A CE CHARACTERISTICS U W Characteristic curves are similar for all voltage options of the LT6660. Curves from the LT6660-2.5 and the LT6660-10 represent the extremes of the voltage options. Characteristic curves for other output voltages fall between these curves, and can be estimated based on their voltage output.
PAGE 8
LT6660 APPLICATIO S I FOR ATIO U U W U Longer Battery Life Series references have a large advantage over older shunt style references. Shunt references require a resistor from the power supply to operate. This resistor must be chosen to supply the maximum current that can ever be demanded by the circuit being regulated. When the circuit being controlled is not operating at this maximum current, the shunt reference must always sink this current, resulting in high dissipation and short battery life.
PAGE 9
LT6660 APPLICATIO S I FOR ATIO U U U Table 1. Maximum Output Capacitance VOLTAGE OPTION IOUT = 100µA IOUT = 1mA IOUT = 10mA IOUT = 20mA 2.5V >10µF >10µF 2µF 0.68µF 3V >10µF >10µF 2µF 0.68µF 3.3V >10µF >10µF 1µF 0.68µF 5V >10µF >10µF 1µF 0.68µF 10V >10µF 1µF 0.15µF 0.1µF Long-Term Drift Long-term drift cannot be extrapolated from accelerated high temperature testing. This erroneous technique gives drift numbers that are wildly optimistic.
PAGE 10
LT6660 APPLICATIO S I FOR ATIO U W U U Output Accuracy Like all references, either series or shunt, the error budget of the LT6660s is made up of primarily three components: initial accuracy, temperature coefﬁcient and load regulation. Line regulation is neglected because it typically contributes only 150ppm/V. The LT6660s typically shift 0.02% when soldered into a PCB, so this is also neglected.
PAGE 11
LT6660 PACKAGE DESCRIPTIO U DC Package 3-Lead Plastic DFN (2mm × 2mm) (Reference LTC DWG # 05-08-1717 Rev Ø) 1.35 ±0.05 (2 SIDES) 1.00 ±0.05 1.30 ±0.05 (2 SIDES) 2.00 ±0.05 PACKAGE OUTLINE 0.25 ± 0.05 0.50 BSC RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS 1.35 ± 0.05 (2 SIDES) 2.00 ±0.10 (4 SIDES) PIN 1 BAR TOP MARK (SEE NOTE 6) 1.00 ± 0.05 (2 SIDES) 0.40 ±0.05 0.200 REF 0.75 ±0.05 R = 0.05 TYP 0.70 ±0.05 PIN 1 NOTCH R = 0.20 OR 0.25 × 45° CHAMFER 3 R = 0.115 TYP 1 0.25 ± 0.05 0.
PAGE 12
LT6660 TYPICAL APPLICATIO U Handling Higher Load Currents V+ + 40mA 3 47µF IN R1* LT6660 OUT 1 10mA VOUT GND 2 RL TYPICAL LOAD CURRENT = 50mA *SELECT R1 TO DELIVER 80% OF TYPICAL LOAD CURRENT. LT6660 WILL THEN SOURCE AS NECESSARY TO MAINTAIN PROPER OUTPUT. DO NOT REMOVE LOAD AS OUTPUT WILL BE DRIVEN UNREGULATED HIGH. LINE REGULATION IS DEGRADED IN THIS APPLICATION Boosted Output Current with No Current Limit V + ≥ (VOUT + 1.