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LIN D O C #: 8941
LX8941
A D J U S TA B L E LO W D R O P O U T R E G U L AT O R
T
HE
I
NFINITE
P
OWER
OF
I
N N O VAT I O N
P
RELIMINARY
D
ATA
S
HEET
DESCRIPTION The LX8941 is an adjustable, low dropout regulator rated for more than 1A of output current. It can regulate with as low as 0.8V headroom between the input and output voltages, at 1A output current, thus minimizing power dissipation. In addition, it can be used in applications where worst case supplies require a low input-output differential to maintain regulation. This feature makes it ideal for some processor applications that require 4V operation from a 5V supply. In addition, the LX8941 provides an on/off switch that reduces the IC quiescent current when activated, making it ideal for battery operated applications.
K E Y F E AT U R E S
s 2% Internally Trimmed Output s Output Current In Excess Of 1A s Input-Output Differential Less Than 0.8V At 1A p Reverse Battery Protection p Short Circuit Protection p Internal Thermal Overload Protection p Available In 5-Lead Plastic TO-220 And Surface-Mount TO-263
NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.
PRODUCT HIGHLIGHT
D R O P O U T VO LTA G E V S . O U T P U T CURRENT V S . TEMPERATURE
5V 10F ON ADJ 22F IN
LX8941
OUT
600
4V
500 125C
Dropout Voltage - (mV)
400
25C
300
OFF
200 -40C
100
0 100 500 1000
Output Current - (mA)
PA C K A G E O R D E R I N F O R M A T I O N T A (C) 0 to 70
P Plastic TO-220 5-pin
LX8941CP
DD Plastic TO-263 5-pin
LX8941CDD
Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. LX8941CDDT)
Copyright (c) 1999 Rev. 0.6 4/99
LINFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
1
PRODUCT DATABOOK 1996/1997
LX8941
A D J U S TA B L E LO W D R O P O U T R E G U L AT O R
P
RELIMINARY
D
ATA
S
HEET
A B S O LUT E M AXIM UM R ATINGS
(Note 1)
PACKAGE PIN OUTS
Input Voltage (VIN) ....................................................................................................... 26V Operating Junction Temperature Plastic (P, DD Package) ........................................................................................ 150C Storage Temperature Range ...................................................................... -65C to 150C Lead Temperature (Soldering, 10 seconds) ............................................................. 300C
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.
TAB IS GND
5
1
ON/OFF ADJ GND VO VIN
P PACKAGE (Top View)
THERMAL DATA
P PACKAGE: THERMAL RESISTANCE-JUNCTION TO TAB, JT THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA DD PACKAGE: THERMAL RESISTANCE-JUNCTION TO TAB, JT THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA 4.5C/W 60C/W 4.5C/W 60C/W
5 4 3 2 1
TAB IS GND ON/OFF ADJ GND VO VIN
Junction Temperature Calculation: TJ = TA + (P D 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.
DD PACKAGE (Top View)
BLOCK DIAGRAM
INPUT VOLTAGE C1* 0.1F VIN
* Required if regulator is located far from power supply filter.
1
2
VO
OUTPUT VOLTAGE C2 10F
THERMAL SHUTDOWN ON ON/ OFF
4
ADJ
5
ON/OFF CIRCUIT
OFF
3
GND
LX8941
2
Copyright (c) 1999 Rev. 0.6 4/99
PRODUCT DATABOOK 1996/1997
LX8941
A D J U S TA B L E LO W D R O P O U T R E G U L AT O R
P
RELIMINARY
D
ATA
S
HEET
R E C O M M E N D E D O P E R AT I N G C O N D I T I O N S Parameter
Input Voltage (Note 2) Load Current (with adequate heatsinking) Input Capacitor (VIN to GND) Output Capacitor with ESR of 10 max., (VOUT to GND) Note 2. VIN (MIN) = VOUT + 1.2V (MAX). See Dropout Voltage maximum limit.
Symbol
VIN
Recommended Operating Conditions Min. Typ. Max.
3.8 5 0.1 10 26 1000
Units
V mA F F
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, these specifications apply over the operating ambient temperature of 0C to +125C for LX8941CP; VIN = 10V, IO = 1A, C OUT = 22F, and are for DC characteristics only. (Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.)
Parameter
ADJ Pin Voltage Line Regulation Load Regulation Dropout Voltage
Symbol
VO VOI VOL V
Test Conditions
IO = 0A, TA = 25C VO + 2V V IN 26V, IO = 5mA 50mA IO 1A, VO = VADJ IO = 100mA IO = 500mA IO = 1A IO 5mA, 7 VIN 26V IO = 500mA IO = 1000mA VIN = 10V, IO = 1A VIN = 26V 10Hz - 100kHz, IO = 5mA fO = 120Hz, 1VRMS, IO = 100mA
Min.
1.225
LX8941 Typ.
1.25 1 10 150 275 400 3 30 115 2 1.2 150 20 66
Max.
1.275 50 50 300 500 800 15 50 180 20
Units
V mV mV mV mV mV mA mA mA A A VRMS mV/1000hr dB V A V A
Quiescent Current
IQ
Adjust Pin Current Current Limit Output Noise Voltage (Note 3) Long Term Stability (Note 3) Ripple Rejection (Note 3)
I ADJ I CL VO RMS RR
1
Enable Logic Section
On Threshold Voltage On Threshold Current Off Threshold Voltage Off Threshold Current Note 3. These parameters, although guaranteed, are not tested in production. 2 50 0.8 -10
PRELIMINARY DATA - Information contained in this document is pre-production data, and is proprietary to LinFinity. It may not 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) 1999 Rev. 0.6 4/99
3

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