LX8817 Dual Channel 2.5A Dropout Regulator RELIMINARY L

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LX8817 Dual Channel 2.5A Dropout Regulator RELIMINARY L

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LX8817
Dual Channel 2.5A Dropout Regulator
RELIMINARY
LX8817 dual channel positive-voltage linear regulator. This dual regulator fixed output coupled with adjustable output. Each channel features low-dropout high accuracy. LX8817 utilizes dual inputs that used separate sources control power sections. This configuration reduces power dissipation operating regulator near dropout (VPWR-VOUT 0.6V 2.5A) while providing sufficient operating headroom control logic. LX8817 provides designers with efficient flexible power management solution, minimal printed circuit board area, shorter design cycles. Each channel supply 2.5A independently with regulator design optimized system efficiency consuming minimal ground current directing quiescent current load. LX8817 features on-chip trimming internal voltage reference, enabling precise output voltages, typically it's specified value. Power sequencing logic ensures proper startup regardless level VCTRL VPWR. LX8817 outputs remain while VPWR 2.7V. Thermal Short Circuit Current Protection integrated on-chip operate independently each regulator output. LX8817 regulator stable with low-value output capacitor, typically 10µF tantalum ceramic outputs, allowing designers flexibility external component selection. Linfinity's S-PAK power package offers maximum power dissipation ease assembly using surface mount technology.
Independent Regulated
Microsemi
Outputs
Accurate Output Voltages Max. Dropout 0.6V Rated
Current
Independent Thermal
Current Limit Protection
Profile Lead Power
Package
Tolerance Line (0.2%)
Load (0.4%) Regulation
Wide Supply Voltage 3.0V
10.0V
Loop Stability Independent
Output Capacitor Type
3.3V 2.5V/ADJ Linear
Regulator Voltage Logic Supplies Active SCSI Terminators Battery Charging Circuits Instrumentation Peripherals
IMPORTANT: most current data, consult MICROSEMI's website: http://www.microsemi.com
8817
(°C) OUTPUT 2.5V OUTPUT
Plastic S-PAK
7-PIN LX8817-2500CDF
Note: Available Tape Reel. Append letter part number. (i.e. LX8817-xxxxC_T)
Copyright 2000 Rev. 0.2a, 2000-09-15
Microsemi
Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, 92841, 714-898-8121, Fax: 714-893-2570
Page
LX8817
Dual Channel 2.5A Dropout Regulator
RELIMINARY
Input Voltage (VCTRL, VPWR) 13.5V Load Current (Internally Limited) 3.0A Power Dissipation. Internally Limited Short-Circuit Protection.Indefinite Operating Junction Temperature .150°C Storage Temperature Range -65°C 150°C Lead Temperature (Soldering seconds) .235°C
Note: Exceeding these ratings could cause damage device. voltages with respect Ground. Currents positive into, negative specified terminal
Microsemi
iew)
Plastic S-PAK 7-PIN THERMAL RESISTANCE-JUNCTION TAB, THERMAL RESISTANCE-JUNCTION AMBIENT, 4.5°C/W 20°C/W
Junction Temperature Calculation: JA). numbers guidelines thermal performance device/pc-board system. above assume ambient airflow. vary from 10°C/W 30°C/W depending mounting technique. (See Application Notes Section: Thermal considerations)
VCTRL VOUT1 VPWR VOUT2 ADJV2
Unregulated input voltage supply, provides bias control circuitry, (VCTRL VOUT) Regulator fixed output voltage.
Unregulated input voltage supply power section. proper operation: (VPWR VOUT) VDROPOUT.
Common terminal ground reference, package internally connected this pin. Regulator adjustable output. Regulator voltage feedback. Sets output voltage regulator external resistor divider. used.
PACKAGE DATA PACKAGE
Copyright 2000 Rev. 0.2a, 2000-09-15
Microsemi
Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, 92841, 714-898-8121, Fax: 714-893-2570
Page
LX8817
Dual Channel 2.5A Dropout Regulator
RELIMINARY
Unless otherwise specified, following specifications apply over operating ambient temperature 135°C except where otherwise noted following test conditions: VCTRL VPWR 3.3V IOUT 10mA, 10µF (Tantalum), using duty cycling methods. Parameter Symbol Test Conditions LX8817-xx00 Units
Microsemi
FIXED OUTPUT
Output Voltage LX8815-2500 Line Regulation Load Regulation Dropout Voltage (PWR) Current Limit Minimum Load Current
V1(VIN) V1(I1) VPWR-V1 (MAX)
10mA, 25°C 2.5A, 3.75V VCTRL VPWR 5.5V 3.3V<VCTRL<10V, 3.3V<VPWR<5V, 2.5A, VCTRL=5V, VPWR=3.3V 2.5A, 2.0A, 1.0A, Note 10mA, 25°C 2.5A, 3.0V VCTRL VPWR 5.5V 3V<VCTRL<10V, 2V<VPWR<5.5V, 2.5A, VCTRL=5V, VPWR=3.3V 2.5A, 2.0A, 1.0A, Note
2.475 2.425
2.500 2.500 0.500 0.375 0.225 1.250 1.250 0.05 0.500 0.375 0.225
2.550 2.570 0.630 0.530 0.350 1.275
2.55
ADJUSTABLE OUTPUT
1.225 1.213
Reference Voltage Line Regulation Load Regulation Dropout Voltage Current Limit Minimum Load Current Adjust Bias Current
V2(VIN) V2(I2) VPWR-V2 (MAX) IADJ
1.288 0.63 0.53 0.35
2.55
ENTIRE REGULATOR
Under Voltage Lockout Quiescent Current Ripple Rejection Output Noise Thermal Shutdown PSRR TJSD
VPWR Rising, 3.0V<VCTRL=10V, Both Outputs High Impedance VCTRL Rising, 3.0V<VPWR=10V, Both Outputs High Impedance I1=I2=10mA f=120Hz, 25°C 10Hz 10kHz
%VOUT
0.003
Note Minimum load current defined amount output current required maintain regulation. Typically this current provides bias external resistor divider network used output voltage.
ELECTRICALS ELECTRICALS
Copyright 2000 Rev. 0.2a, 2000-09-15
Microsemi
Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, 92841, 714-898-8121, Fax: 714-893-2570
Page
LX8817
Dual Channel 2.5A Dropout Regulator
RELIMINARY
Microsemi
Input equenc
CTRL
1.25V
stab
Note:
MILLIMETERS 9.27 9.52 8.89 9.14 1.77 2.03 7.49 7.74 0.12 0.38 0.58 0.84 1.27 0.79 1.04 4.31 6.86 0.03 0.13 10.41 10.67
INCHES .365 .375 .350 .360 .070 .080 .295 .305 .005 .015 .023 .033 0.050 .031 .041 .170 .270 .001 .005 .410 .420
APPLICATIONS APPLICATIONS
Dimensions include mold flash protrusions; these shall exceed 0.155mm(.006") side. Lead dimension shall include solder coverage.
Preliminary Data Information contained this document pre-production data proprietary LinFinity. modified without express written consent LinFinity. Product referred herein offered sample form only LinFinity reserves right change discontinue this proposed product time.
Copyright 2000 Rev. 0.2a, 2000-09-15
Microsemi
Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, 92841, 714-898-8121, Fax: 714-893-2570
Page

LX8817 Dual Channel 2.5A Dropout Regulator RELIMINARY L

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