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L I N D O C # : 8610
LX8610-XX
1 A B I C M O S V E RY L O W D R O P O U T R E G U L AT O R S
T
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I
NFINITE
P
OWER
OF
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N N O VAT I O N
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RELIMINARY
D
ATA
S
HEET
DESCRIPTION The LX8610 family are positive very low dropout regulators. They are designed to provide a power supply for very low headroom applications, such as 3.3V - 2.5V. BiCMOS technology allows an effective series pass element resistance, RDS(ON) of 250m resulting in a typical dropout voltage of 250mV at 1A. Low Quiescent Current and LogicControlled Shutdown help conserve battery life and increase system efficiency. Typical quiescent current is under 400A irrespective of load current, while the shutdown current is only 10A. The device will enter shutdown mode when the ENABLE pin is pulled low. Thermal and Short-Circuit Current Limiting: the LX8610 limits the current when the output is shorted, so protecting sensitive load circuits. The device will also turn off if the junction temperature exceeds 165C. Available in small outline SOT-223 and 8-pin SOIC: adjustable versions use the 8-pin SOIC, and fixed output voltage devices are supplied in the 3-lead SOT223.
K E Y F E AT U R E S
s Dropout Voltage Typically 250mV At 1A And 50mV At 10mA s Low Quiescent Current, Under 400A, Irrespective Of Load s Shutdown Current 10A s Adjustable Output Version In 8-Pin SOIC Package s Fixed Outputs Of 2.5V, 3.3V Available In 3-Pin SOT-223 Package s Low Reverse Leakage Current s Short-Circuit And Thermal Shutdown Protection
A P P L I C AT I O N S
s 3.3V & 2.5V Supplies For Memory, Microprocessors, Clock Circuits, Etc. s Portable Equipment
NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.
PRODUCT HIGHLIGHT
LX8610- X X B L O C K DIAGRAM
V V
C u rre n t L im it
IN
OUT
R
A
R e fe re n c e C u rre n t
C h a rg e Pum p
A D J* R
B
1 .2 5 V ENABLE
1 .5 V R e v e rs e V o lta g e S ense T h e rm a l S h u td o w n
R
A
GND
R
B
L X 8 6 1 0 -0 0 L X 8 6 1 0 -2 5 L X 8 6 1 0 -3 3
25k 41k
25k 25k
* L X 8 6 1 0 -0 0 V e r s io n O n ly .
PA C K A G E O R D E R I N F O R M AT I O N Output TA (C) ST Plastic SOT-223 DM Plastic SOIC Voltage 3-pin 8-pin 3.3 0 to 70 2.5 ADJ (00) LX8610-33CST LX8610-25CST LX8610-33CDM LX8610-25CDM LX8610-00CDM
Note: All surface-mount packages are available in Tape & Reel, append the letter "T" to part number. (i.e. LX8610-XXCDMT)
Copyright (c) 2000 Rev. 0.5 1/00
LINFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
1
PRODUCT DATABOOK 1996/1997
LX8610-XX
1 A B I C M O S V E RY L OW D R O P O U T R E G U L AT O R S
P
RELIMINARY
D
ATA
S
HEET
A B S O L U T E M A X I M U M R AT I N G S
(Note 1)
PA C K A G E P I N O U T S
TAB IS GND 3. VOUT 2. GND 1. VIN
Input Voltage (VIN) ...................................................................................................... 6.5V Enable Pin .............................................................................................. -0.3V to VIN+0.3V Operating Junction Temperature Plastic (ST & DM Packages) ................................................................................. 125C 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.
ST PACKAGE (Top View)
T H E R M A L D ATA
ST PACKAGE: THERMAL RESISTANCE-JUNCTION TO TAB, JT THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA DM PACKAGE: THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA 165C/W 15C/W *150C/W
VOUT GND/HEATSINK GND/HEATSINK ADJ
1 2 3 4 8 7 6 5
ENABLE GND/HEATSINK GND/HEATSINK VIN
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. * JAcan be improved with package soldered to 0.5IN2 copper area over backside ground plane or internal power plane. JAcan vary from 20C/W to > 40C/W depending on mounting technique.
DM PACKAGE (Top View)
FUNCTIONAL PIN DESCRIPTION
Pin Designator
VIN VOUT
Description
Positive supply input for the regulator. Bypass to GND with at least 2.2F of low ESR, ESL capacitance if supply source is further than 1 inch from the device. Output for the regulator. It is recommended to bypass to GND with at least 10F although this is not required for regulation, rather its needed for transient response. Size your output capacitor to meet the transient loading requirement. If you have a very dynamic load, a larger capacitor will improve the response to these load steps. Reference ground. The input and output decoupling capacitors should be connected to this pin. In addition the tab on the SOT-223 package and pins 2, 3, 6 and 7 on the SOIC package are also used for heatsinking the device. Feedback pin for the regulator. For the LX8610-00, the output voltage can be set by two external resistors with the following relationship: VOUT = 1.25V * (1+R2/R1) where R1 is the resistor connected between VOUT and ADJ, and R2 is the resistor connected between ADJ and GND pin. Enable input. This pin has a threshold of about 1.5V, it should be actively pulled high to enable the regulator. This can be accomplished with a resistive pull-up or controlled by a logic gate. When low, it turns off the regulator and puts the device in a low current shutdown state.
GND ADJ
ENABLE
2
Copyright (c) 2000 Rev. 0.5 1/00
PRODUCT DATABOOK 1996/1997
LX8610-XX
1 A B I C M O S V E RY L OW D R O P O U T R E G U L AT O R S
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 Load Current (with adequate heatsinking) Input Capacitor (VIN to GND) Output Capacitor (VOUT to GND)
Symbol
VIN
Recommended Operating Conditions Min. Typ. Max.
2.5 10 2.2 10 5.5 1000
Units
V mA F F
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, these specifications apply over the operating ambient temperatures for the LX8610-XXC with 0C TA 70C; VIN = VOUT + 1.5V; IOUT = 10mA; CIN = 10F; COUT = 22F; TJ = TA. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.)
LX8610-33 Fixed 3.3V, 1A
Parameter
Output Voltage Line Regulation Load Regulation Dropout Voltage (VDO = VIN - VOUT)
Symbol
VOUT VREG IREG VDO
Test Conditions
TJ = 25C Over Temperature VIN = 3.45V to 5.5V IOUT = 10mA to 1A IOUT = 1A, VOUT = VOUT - 1% IOUT = 0.5A, VOUT = VOUT - 1% IOUT = 10mA, VOUT = VOUT - 1% VOUT = VOUT - 1% VOUT = 0V IOUT = 10mA to 1A 0V < VIN < VOUT, VOUT < 3.4V (at VOUT) 0V < VIN < VOUT, VOUT < 3.4V (at VIN)
Min.
3.25 3.22
LX8610-33 Typ. Max.
3.3 4 5 0.25 0.15 0.05 1.3 1.25 400 400 0 1.5 10 3.35 3.38 8 10 0.4 0.25 0.15 1.8 1.7 600 650
Units
V V mV mV V V V A A A A mA V A
Current Limit Short Circuit Current Quiescent Current Reverse Leakage Current Enable Threshold * Shutdown Current *
ICL ISC IQ
1.1 1
-50 0.8
25
LX8610-25 Fixed 2.5V, 1A
Parameter
Output Voltage Line Regulation Load Regulation Dropout Voltage (VDO = VIN - VOUT)
Symbol
VOUT VREG IREG VDO
Test Conditions
TJ = 25C Over Temperature VIN = 3.1V to 5.5V, IOUT = -10mA IOUT = 10mA to 1A IOUT = 1A, VOUT = VOUT - 1% IOUT = 0.5A, VOUT = VOUT - 1% IOUT = 10mA, VOUT = VOUT - 1% VOUT = VOUT - 1% VOUT = 0V IOUT = 10mA to 1A 0V < VIN < VOUT, VOUT < 2.6V (at VOUT) 0V < VIN < VOUT, VOUT < 2.6V (at VIN)
Min.
2.46 2.44
LX8610-25 Typ. Max.
2.5 2.5 3 5 0.25 0.15 0.05 1.3 1.25 300 400 0 1.5 10 2.54 2.56 6 10 0.4 0.25 0.1 1.8 1.7 600 650
Units
V V mV mV V V V A A A A mA V A
Current Limit Short Circuit Current Quiescent Current Reverse Leakage Current Enable Threshold * Shutdown Current *
ICL ISC IQ
1.1 1
-50 0.8
25
* Enable Threshold and Shutdown Current apply only to 8-pin SOIC package outline versions.
Copyright (c) 2000 Rev. 0.5 1/00
3
PRODUCT DATABOOK 1996/1997
LX8610-XX
1 A B I C M O S V E RY L OW D R O P O U T R E G U L AT O R S
P
RELIMINARY
D
ATA
S
HEET
E L E C T R I C A L C H A R A C T E R I S T I C S (Continued)
LX8610-00 Adjustable Output, 1A
Parameter
Reference Voltage Line Regulation Load Regulation Dropout Voltage (VDO = VOUT - VIN)
Symbol
VREF VREG IREG VDO
Test Conditions
TJ = 25C Over Temperature VIN = VOUT+150mV to 5.5V, IOUT = 10mA IOUT = 10mA to 1A IOUT = 1A, VIN > 4V IOUT = 0.5A, VIN > 3V IOUT = 10mA, VIN > 3V VOUT = VOUT - 1% VOUT = 0V IOUT = 10mA to 1A, VIN = 5.5V 0V < VIN < VOUT, VOUT < 5.5V (at VOUT) 0V < VIN < VOUT, VOUT < 5.5V (at VIN)
Min.
1.238 1.225
LX8610-00 Typ. Max.
1.25 1.25 2 7 0.25 0.15 0.05 1.3 1.25 400 400 0 100 1.5 10 1.262 1.270 4 15 0.4 0.25 0.15 1.8 1.7 600 650 250 25
Units
V V mV mV V V V A A A A mA nA V A
Current Limit Short Circuit Current Quiescent Current Reverse Leakage Current Bias Current at ADJ Pin Enable Threshold Shutdown Current
ICL ISC IQ
1.1 1
-50 0.8
Enable < 0.8V
T Y P I C A L A P P L I C AT I O N
VIN
1
5
VOUT R1 COUT R2
LX8610-XX CIN GND ADJ
2 3 4
ENABLE
VREF VOUT = VREF 1 + R2 R1
FIGURE 1 -- Typical Application
4
Copyright (c) 2000 Rev. 0.5 1/00
PRODUCT DATABOOK 1996/1997
LX8610-XX
1 A B I C M O S V E RY L OW D R O P O U T R E G U L AT O R S
P
RELIMINARY
D
ATA
S
HEET
CHARACTERISTIC CURVES
300
250
DROPOUT (mV)
200
0
150
25 C 75 C
100
50
0 0.01 0.25 0.5 0.75 1
IOUT (A)
FIGURE 2 -- Dropout Voltage vs. Output Current (Typical - LX8610-25CST)
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) 2000 Rev. 0.5 1/00
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