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A
MICROSEMI
COMPANY
LX8815
Dual Channel 1A Low Dropout Regulator
PRELIMINARY
The LX8815 is a dual channel positive-voltage linear regulator. This dual regulator has either one fixed output coupled with an adjustable output or two fixed outputs. Each channel features low-dropout and high accuracy. The LX8815 provides designers with a flexible power management solution, minimal printed circuit board area, and shorter design cycles. Each channel can supply up to one amp independently with a regulator design optimized for system efficiency by consuming minimal ground current and directing quiescent current to the load. The LX8815 features on-chip trimming of the internal voltage reference enabling precise output voltages, typically 1% of it's specified value, while the BiPolar output transistor has a low dropout voltage even at full output current (VDO < 1.1V typ. @ 1A). Thermal and Short Circuit Current Protection are integrated on-chip and operate independently for each regulator output. The LX8815 regulator is stable with a low-value output capacitor, typically 3.3F tantalum or 4.7F ceramic on the outputs, allowing designers flexibility in external component selection. Linfinity's S-PAK power package offers maximum power dissipation and ease of assembly using surface mount technology.

Two Independent Regulated
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Outputs
Accurate Output Voltages Max. Dropout of 1.1V at Rated
Current
Independent Thermal and
Current Limit Protection
Low Profile 5 Lead SMT Power
Package
Low Tolerance Line (0.2%) and
Load (0.4%) Regulation
Wide DC Supply Voltage of 4.0V
to 12.0V
Loop Stability Independent of
Output Capacitor Type

IMPORTANT: For the most current data, consult MICROSEMI's website: http://www.microsemi.com
5V to 3.3V Linear Regulator Low Voltage Logic Supplies Active SCSI Terminators Battery Charging Circuits Instrumentation PC Peripherals

V IN R3 0.1 C1 10F BIAS 1.25V VREF
R VOUT 2 = 1.25 x 1 + 1 + I ADJ x R2 R2
4 1
+ -
5
VOUT1 C2 4.7F
+ GND
3
VOUT2 R1
Adjustable or Fixed
LX 8 8 1 5 LX 8 8 1 5
2
C3 4.7F R2
Note: Application circuit above using ceramic capacitors, C 1 requires R 3 (0.075 to 0.3). For Tantalum capacitors: R 3 is not used a n d C 1, C 2, and C 3 > 2 F. R1 and R2 used with LX88xx-xx only.
Copyright (c) 2000 Rev. 0.2a, 2000-11-20
Microsemi
Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
A
MICROSEMI
COMPANY
LX8815
Dual Channel 1A Low Dropout Regulator
PRELIMINARY

TJ (C) OUTPUT V1 3.3V 3.3V 3.3V 2.85V 2.5V OUTPUT V2 2.5V 1.8V Adj Adj Adj
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DF Plastic S-PAK
5-PIN LX8815-3325CDF LX8815-3318CDF LX8815-3300CDF LX8815-2800CDF LX8815-2500CDF
0 to 125
Note: Available in Tape & Reel. Append the letter "T" to the part number. (i.e. LX8815-3325CDFT)

Input Voltage (VBAT)..................................................................................................13.5V Load Current (Internally Limited)................................................................................... 1A Power Dissipation ................................................................................... Internally Limited Short-Circuit Protection ....................................................................................... Indefinite Operating Junction Temperature ................................................................................150C Lead Temperature (Soldering 180 seconds) ...............................................................235C
Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground. Currents are positive into, negative out of specified terminal.

TAB is GND
5 4 3 2 1
V OUT1 V OUT2 GND ADJ V IN
DF P A C K A G E
(Top View)

DF
PACKAGE THERMAL RESISTANCE-JUNCTION TO TAB, JT THERMAL RESISTANCE-JUNCTION TO AMBIENT, 4.5C/W 24.5C/W
JA
Junction Temperature Calculation: TJ = TA + (PD x JA). The JA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow. JA can vary from 20C/W to > 40C/W depending on mounting technique. (See Application Notes Section: Thermal considerations)

VIN ADJ GND VOUT1 VOUT2

Unregulated input voltage supply. Adjust control pin for regulator 2
PACKAGE DATA PACKAGE DATA
Common terminal for ground reference
Fixed voltage regulator output (Regulator #1) Fixed or adjustable regulator output (Regulator #2)
Copyright (c) 2000 Rev. 0.2a, 2000-11-20
Microsemi
Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
A
MICROSEMI
COMPANY
LX8815
Dual Channel 1A Low Dropout Regulator
PRELIMINARY
Unless otherwise specified, the following specifications apply over the operating ambient temperature 0C TA 125C except where otherwise noted and the following test conditions: VIN = 5V, IOUT = 10mA, C1 = 4.7F (Tantalum), C2 = 4.7F (Tantalum), and TJ = TA 25C using low duty cycling methods. Parameter Symbol Test Conditions LX8815-xx00 Min Typ Max Units

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FIXED OUTPUT
Output Voltage * LX8815-3300 * LX8815-2800 * LX8815-2500 Line Regulation Load Regulation Dropout Voltage Current Limit Minimum Load Current V1(VIN) V1(I1) V IOUT (MAX) IL VREF V1
VIN = 5V, IOUT = 5mA, TJ = 25C 5mA < I1 < 1A, 4.50V < VIN < 10V VIN = 5V, IOUT = 5mA, TJ = 25C 5mA < I1 < 1A, 4.50V < VIN < 10V VIN = 5V, IOUT = 5mA, TJ = 25C 5mA < I1 < 1A, 4.50V < VIN < 10V 4.75V < VIN < 10V, IOUT = 5mA 5mA < I1 < 1A, VIN = 4.75V ILOAD = 1A, V1 = -2% (VIN - V1) = 5V Note 1
3.250 3.234 2.807 2.793 2.462 2.450
1.0
3.300 3.300 2.850 2.850 2.500 2.500 0.01 0.01 1.1 1.4 0 1.250 1.250 0.01 0.01 1.1 1.4 1 1 1.8 75 0.003 140
3.350 3.366 2.893 2.907 2.537 2.550 0.2 0.4 1.25 2 1.262 1.269 0.2 0.4 1.3 3 5 5
V
%V1 %V1 V A mA V %V1 %V1 V A mA A mA dB %V1 C
ADJUSTABLE OUTPUT
Reference Voltage Line Regulation Load Regulation Dropout Voltage Current Limit Minimum Load Current Adjust Pin Bias Current
VIN = 5V, IOUT = 10mA, TJ = 25C 5mA < I1 < 1A, 4.50V < VIN < 10V VREF(VIN) 4.75V < VIN < 10V, IOUT = 5mA VREF(I2) 5mA < I1 < 1A, VIN = 4.75V V VIN > 4.5V, ILOAD = 1A, V1 = -1% IOUT (MAX) (VIN - V1) = 5V IL Note 1 IADJ IQ PSRR VOUT (RMS) TJSD VIN < 10V, I1 = 5mA, I2 = 5mA f=120Hz, VIN = 5V 10Hz < f < 10kHz
1.238 1.231
1.0
ENTIRE REGULATOR
Quiescent Current Ripple Rejection RMS Output Noise (% of VOUT) Thermal Shutdown
60
Note 1: Minimum load current is defined as the amount of output current required to maintain regulation.
ELECTRICALS ELECTRICALS
Copyright (c) 2000 Rev. 0.2a, 2000-11-20
Microsemi
Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
A
MICROSEMI
COMPANY
LX8815
Dual Channel 1A Low Dropout Regulator
PRELIMINARY
Unless otherwise specified, the following specifications apply over the operating ambient temperature 0C TA 125C except where otherwise noted and the following test conditions: VIN = 5V, IOUT = 10mA, C1 = 4.7F (Tantalum), C2 = 4.7F (Tantalum), and TJ = TA 25C using low duty cycling methods. Parameter Symbol Test Conditions LX8815-33xx Min Typ Max 3.250 3.234 3.300 3.300 0.3 0.8 1.1 1.4 0 3.350 3.366 5.0 10 1.25 2 Units

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FIXED OUTPUT 1
Output Voltage Line Regulation Load Regulation Dropout Voltage Current Limit Minimum Load Current
V1 V1(VIN) V1(I1) V IOUT (MAX) IL
VIN = 5V, IOUT = 5mA, TJ = 25C 5mA < I1 < 1A, 4.50V < VIN < 10V 4.75V < VIN < 10V, IOUT = 5mA 5mA < I1 < 1A, VIN = 4.75V ILOAD = 1A, V1 = -2% (VIN - V1) Note 1
V mV mV V A mA
1.0
FIXED OUTPUT 2
Output Voltage * LX8815-3325 * LX8815-3318 Line Regulation Load Regulation Dropout Voltage Current Limit Minimum Load Current V1 V1(VIN) V1(I1) V IOUT (MAX) IL
VIN = 5V, IOUT = 5mA, TJ = 25C 5mA < I1 < 1A, 4.50V < VIN < 10V VIN = 5V, IOUT = 5mA, TJ = 25C 5mA < I1 < 1A, 4.50V < VIN < 10V 4.75V < VIN < 10V, IOUT = 5mA 5mA < I1 < 1A, VIN = 4.75V VIN > 4.5V, ILOAD = 1A, V1 = -1% (VIN - V1) Note 1
2.462 2.450 1.773 1.764
1.0
2.50 2.50 1.80 1.80 0.02 0.04 1.1 1.4 1 1.8 75 0.003 140
2.537 2.550 1.827 1.36 0.15 0.3 1.3 2 7
V
%mV %mV V A mA mA dB %V1 C
ENTIRE REGULATOR
Quiescent Current IQ VIN < 10V, I1 = 5mA, I2 = 5mA Ripple Rejection PSRR f=120Hz, VIN = 5V RMS Output Noise (% of VOUT) VOUT (RMS) 10Hz < f < 10kHz Thermal Shutdown TJSD Note 1: Minimum load current is defined as the amount of output current required to maintain regulation.
60
ELECTRICALS ELECTRICALS
Copyright (c) 2000 Rev. 0.2a, 2000-11-20
Microsemi
Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
A
MICROSEMI
COMPANY
A I
LX8815
Dual Channel 1A Low Dropout Regulator
PRELIMINARY

Dim
C
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B K
D
H J F G E
A B C D E F G H I J K
Note:
MILLIMETERS MIN MAX 9.27 9.52 8.89 9.14 1.77 2.03 7.49 7.74 0.12 0.38 0.58 0.84 1.70 BSC 0.79 1.04 4.31 6.86 0.03 0.13 10.41 10.67
INCHES MIN MAX .365 .375 .350 .360 .070 .080 .295 .305 .005 .015 .023 .033 0.067 BSC .031 .041 .170 .270 .001 .005 .410 .420
1. Dimensions do not include mold flash or protrusions; these shall not exceed 0.155mm(.006") on any side. Lead dimension shall not include solder coverage.
MECHANICALS MECHANICALS
Preliminary Data - Information contained in this document is pre-production data and is proprietary to LinFinity. It may not be modified in any way without the express written consent of LinFinity. Product referred to herein is offered in sample form only and LinFinity reserves the right to change or discontinue this proposed product at any time.
Copyright (c) 2000 Rev. 0.2a, 2000-11-20
Microsemi
Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5

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