Microsemi Corporation LX8117B-05CDT, LX8117B-05CDD, LX8117B-00CST, LX8117B-00CDT, LX8117B-00CDD Datasheet

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LIN DOC #:

8117

LX8117-xx/8117A-xx/8117B-xx

0.8, 1 & 1.2A L OW DROPOUT POSITIVE REGULATORS

T HE I NFINITE P OWER OF I NNOVATION

DESCRIPTION KEY FEATURES

The LX8117/8117A/8117B series are positive Low Dropout (LDO) regulators. At the designed maximum load current, the LX8117 series dropout voltage is guaranteed to be 1.2V or lower at 0.8A (LX8117A 1.3V @ 1A). The dropout voltage decreases with load current.

An adjustable output voltage version of the LX8117/17A/17B is available, as well as versions with fixed outputs of

2.5V, 2.85V, 3.3V and 5V. The 2.85V version is specifically designed for use as a component of active termination networks for the SCSI bus. On-chip trimming of the internal voltage reference allows specification of the initial output voltage to within ±1% of its nominal value. The output current-limit point is also trimmed, which helps to minimize stress on both the regulator and the system power source when they are operated under short-circuit conditions. The regulator's internal circuitry will

NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.

PRODUCT HIGHLIGHT

operate at input-to-output differential voltages down to 1V.

Most regulator circuit designs include output capacitors with values in the range of tens to hundreds of microfarads or more. The LX8117/17A/17B typically requires at least 10µF of output capacitance for stable operation.

PNP-type regulators can waste current equal to as much as 10 percent of their output as a quiescent current which flows directly to ground, bypassing the load. Quiescent current from the LX8117/17A/ 17B flows through the load, increasing power-use efficiency and allowing cooler operation.

The LX8117 is available in low-profile plastic SOT-223 and D-Pak packages for applications where space is at a premium. The LX8117 is also available in a plastic TO-263 package for instances when the thermal resistance from the circuit die to the environment must be minimized.

ACTIVE TERMINATOR FOR SCSI-2 BUS

110

Ω

110

Ω

P RODUCTION DATA SHEET

■ 0.2% Line Regulation Maximum

■ 0.4% Load Regulation Maximum

■ Output Current Of 800mA

■ Regulates Down To 1.2V Dropout

(LX8117) And 1.3V Dropout (LX8117A)

■ Operates Down To 1V Dropout

■ Space Saving SOT-223 Surface

Mount Package

■ Guaranteed Dropout Voltage At Multiple

Current Levels

■ Three-Terminal Adjustable Or Fixed 2.5V,

2.85V, 3.3V & 5V

APPLICATIONS

■ Battery Chargers

■ Active SCSI Terminators

■ 5V To 3.3V Linear Regulators

■ High-Efficiency Linear Regulators

■ Post Regulators For Switching Supplies

AVAILABLE OPTIONS PER PART #

Part #

LX8117/8117A/8117B-00 Adjustable LX8117/8117A/8117B-25 2.5V LX8117/8117A/8117B-28 2.85V LX8117/8117A/8117B-33 3.3V LX8117/8117A/8117B-05 5V

Output

Voltage

4.75V to

5.25V

LX8117-28

OUTIN

110

Ω

18 to 27 Lines

GND

10µF

PACKAGE ORDER INFORMATION

(°C)

0 to 125 1.0A LX8117A-xxCST LX8117A-xxCDD LX8117A-xxCDT

Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number

O/P

Current

0.8A LX8117-xxCST LX8117-xxCDD LX8117-xxCDT

1.2A LX8117B-xxCST LX8117B-xxCDD LX8117B-xxCDT

(i.e. LX8117-28CSTT). "xx" refers to output voltage, please see table above.

22µF

Plastic SOT-223 3-pin

110

Ω

Plastic T0-263 3-pin

Plastic T0-252

(D-Pak) 3-pin

L INF INITY MICROELECTRONICS INC.

11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570

PRODUCT DATABOOK 1996/1997

LX8117-xx/8117A-xx/8117B-xx

0.8, 1 & 1.2A L OW DROPOUT POSITIVE REGULATORS

RODUCTION DATA SHEET

ABSOLUTE MAXIMUM RATINGS (Note 1)

Power Dissipation .................................................................................. Internally Limited

Input Voltage

LX8117-00/8117A-00/8117B-00 (Adj.) ..................................................................... 15V

LX8117-33/8117A-33/8117B-33 (3.3V), LX8117-05/8117A-05/8117B-05 (5.0V) .... 15V

LX8117-25/8117A-25/8117B-25 (2.5V), LX8117-28/8117A-28/8117B-28 (2.85V) .. 12V

Surge Voltage ............................................................................................................... 15V

Operating Junction Temperature

Plastic (ST, DD & DT Packages) .......................................................................... 150°C

Storage Temperature Range ...................................................................... -65°C to 150°C

Lead Temperature (Soldering, 10 seconds) ............................................................. 300°C

Short-Circuit Protection ....................................................................................... Indefinite

Note 1. Exceeding these ratings could cause damage to the device. All voltages are with

respect to Ground. Currents are positive into, negative out of the specified terminal.

THERMAL DATA

ST PACKAGE:

THERMAL RESISTANCE-JUNCTION TO TAB,

THERMAL RESISTANCE-JUNCTION TO AMBIENT,

DD PACKAGE:

THERMAL RESISTANCE-JUNCTION TO TAB,

THERMAL RESISTANCE-JUNCTION TO AMBIENT,

DT PACKAGE:

THERMAL RESISTANCE-JUNCTION TO TAB,

THERMAL RESISTANCE-JUNCTION TO AMBIENT,

Junction Temperature Calculation: TJ = TA + (P thermal performance of the device/pc-board system. All of the above assume no ambient airflow.

* θ

can be improved with package soldered to 0.5IN2 copper area over backside ground

plane or internal power plane. θ mounting technique. (See Application Notes Section: Thermal Considerations)

can vary from 20ºC/W to > 40ºC/W depending on

θθ

x θJA). The θ

15°C/W

*150°C/W

10°C/W

*60°C/W

9°C/W

*80°C/W

numbers are guidelines for the

PACKAGE PIN OUTS

TAB IS V

OUT

3. IN

2. OUT

1. ADJ / GND

ST PACKAGE

(Top View)

TAB IS V

OUT

ADJ / GND

DD PACKAGE (D2 Pak)

(Top View)

TAB IS V

OUT

3. IN

2. OUT

1. ADJ / GND

DT PACKAGE (D-Pak)

(Top View)

BLOCK DIAGRAM

Bias

Circuit

Thermal

Limit Circuit

Bandgap

Circuit

Control

Circuit

Output

Circuit

Current

Limit Circuit

OUT

Rev. 1.4 3/99

PRODUCT DATABOOK 1996/1997

LX8117-xx/8117A-xx/8117B-xx

0.8, 1 & 1.2A L OW DROPOUT POSITIVE REGULATORS

P RODUCTION DATA SHEET

RECOMMENDED OPERATING CONDITIONS (Note 2)

Parameter

Symbol

Input Voltage

Operating Voltage LX8117(A/B)-00 / 8117(A/B)-05

LX8117(A/B)-25 / -28 / -33

Input-Output Differential LX8117(A/B)-00 Operating Ambient Temperature Range

Note 2. Range over which the device is functional.

ELECTRICAL CHARACTERISTICS

(Unless otherwise specified: 0°C ≤ TJ ≤ 125°C, I

= 0.8A for the LX8117-xx, I

MAX

= 1.0A for the LX8117A-xx, and I

MAX

LX8117-00 / 8117A-00 / 8117B-00 (Adjustable)

Parameter

Reference Voltage V

Line Regulation (Note 3) Load Regulation (Note 3)

Dropout Voltage ∆VI

(Note 4)

LX8117-00 I

LX8117A/B-00 I

Current Limit LX8117-00 I

LX8117A-00 (VIN - V

LX8117B-00 (VIN - V Minimum Load Current (Note 5) I

Thermal Regulation

Ripple Rejection f Adjust Pin Current I

Adjust Pin Current Change ∆I Temperature Stability ∆V Long Term Stability ∆V

RMS Output Noise (% of V

Notes: 3. See thermal regulation specification for changes in output voltage due to heating effects. Load regulation and line regulation are measured at a constant junction

temperature by low duty cycle pulse testing.

4. Dropout voltage is specified over the full output current range of the device. Dropout voltage is defined as the minimum input/output differential measured at the specified output current. Test points and limits are also shown on the Dropout Voltage Curve.

5. Minimum load current is defined as the minimum output current required to maintain regulation.

OUT

Symbol

REFIOUT

∆V

REF(VIN

∆V

REF(IOUT

OUT (MAX)(VIN

OUT (MIN)VIN

∆V

(Pwr)

OUT

ADJ

OUT

OUT (RMS)

= 10mA, (VIN - V

10mA ≤ I

)

(VIN - V

OUT

= 10mA, 1.5V ≤ (V

OUT

) = 3V, 10mA ≤ I

OUT

= 100mA

OUT

= 500mA

OUT

= I

OUT

OUT (MAX)

= I

OUT

OUT (MAX)

- V

) = 5V, TJ = 25°C

OUT

) = 5V, TJ = 25°C

OUT

) = 5V, TJ = 25°C

OUT

≤ 10V

TA = 25°C, 30ms pulse

=120Hz, (VIN - V

RIPPLE

10mA ≤ I

OUT

(T)

(t) TA = 125°C, 1000 hours

10Hz ≤ f ≤ 10kHz

≤ I

Test Conditions Units

) = 2V, TJ = 25°C

OUT

, 1.4V ≤ (V

OUT (MAX)

- V

) ≤ 7V

OUT

≤ I

OUT

OUT (MAX)

) = 3V, V

OUT

, 1.4V ≤ (V

OUT (MAX)

Recommended Operating Conditions

Min. Typ. Max.

0 125 °C

MAX

LX8117 / 17A / 17B-00

- V

) ≤ 10V

OUT

= 1Vp-p

RIPPLE

- V

) ≤ 10V

OUT

Units

15 V

12 V 10 V

= 1.2A for the LX8117B-xx.)

Min. Typ. Max.

1.238 1.250 1.262 V

1.225 1.250 1.270 V

0.05 0.2 %

0.15 0.4 %

0.97 1.10 V

1.00 1.15 V

1.05 1.20 V

1.15 1.30 V

800 950 mA 1000 1200 mA 1200 1500 mA

0.5 5 mA

0.08 0.2 %/W

60 75 dB

45 100 µA

0.2 5 µA

0.5 %

0.3 %

0.003 %

(Other Voltage Options on following pages.)

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