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L I N D O C # : 8630
LX8630-XX
3 A B I C M O S V E R Y L O W D R O P O U T R E G U L AT O R S
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NFINITE
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OWER
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N N O VAT I O N
P
RELIMINARY
D
ATA
S
HEET
DESCRIPTION The LX8630 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 or 2.5V - 1.8V conversion. BiCMOS technology allows an effective series pass element resistance, RDS(ON) of 150m resulting in a typical dropout voltage of 450mV at 3A. 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 LX8630 limits the current when the output is shorted, protecting sensitive load circuits. The device will also turn off if the junction temperature exceeds 150C. Available in Popular TO-220 and TO-263 Power Packages: adjustable versions have five leads, and fixed output voltage devices are supplied in three lead packages.
K E Y F E AT U R E S
s Dropout Voltage Typically 450mV at 3A and 50mV at 10mA s Low Quiescent Current, Typically Under 400A, irrespective of Load s Shutdown Current 10A s Adjustable Output Version in 5-Pin TO-220 & TO-263 Packages s Fixed Outputs of 2.5V and 3.3V Available in 3-Pin TO-220 & TO-263 Packages s Low Reverse Leakage Current s Short-Circuit and Thermal Shutdown Protection
A P P L I C AT I O N S
s 1.8V & 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
LX8630- X X B L O C K D I A G R A M
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
V
IN
GND
R
A
/2 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
B
L X 8 6 3 0 -0 0 L X 8 6 3 0 -2 5 L X 8 6 3 0 -3 3
25k 41k
25k 25k
* 5 - le a d 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 TA (C) Output Voltage 3.3 0 to 125 2.5 ADJ (00)
P Plastic TO-220 3-pin
LX8630-33CP LX8630-25CP --
P Plastic TO-220 5-pin
-- -- LX8630-00CP
DD Plastic TO-263 3-pin
LX8630-33CDD LX8630-25CDD --
DD Plastic TO-263 5-pin
-- -- LX8630-00CDD
Note: All surface-mount packages are available in Tape & Reel, append the letter "T" to part number. (i.e. LX8630-XXCDDT)
Copyright (c) 2000 Rev. 0.6 4/00
LINFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
1
PRODUCT DATABOOK 1996/1997
LX8630-XX
3 A B I C M O S V E R Y L O W 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
(All packages are Top View)
TAB IS GND
3 2 1
Input Voltage (VIN) ...................................................................................................... 6.5V Enable Pin .............................................................................................. -0.3V to VIN+0.3V Operating Junction Temperature Plastic (P & DD Packages) .................................................................................... 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.
VOUT GND VIN
P PACKAGE (3-Pin)
TAB IS GND
T H E R M A L D ATA
P PACKAGE: (3-Pin) THERMAL RESISTANCE-JUNCTION TO TAB, JT THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA P PACKAGE: (5-Pin) THERMAL RESISTANCE-JUNCTION TO TAB, JT THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA DD PACKAGE: (3-Pin) THERMAL RESISTANCE-JUNCTION TO TAB, JT THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA DD PACKAGE: (5-Pin) THERMAL RESISTANCE-JUNCTION TO TAB, JT THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA 2.7C/W 60C/W 2.7C/W 60C/W* 2.7C/W 60C/W 2.7C/W 60C/W
5
1
VOUT ADJ GND ENABLE VIN
P PACKAGE (5-Pin)
TAB IS GND
3 2 1
VOUT GND VIN
DD PACKAGE (3-Pin)
TAB IS GND
5 4 3 2 1
VOUT ADJ GND ENABLE 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.
DD PACKAGE (5-Pin)
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 TO-220 and TO-263 packages along with the ground pin are also used for heatsinking the device. Feedback pin for the regulator. For the LX8630-00, 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 VIN/2, 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. 0.6 4/00
PRODUCT DATABOOK 1996/1997
LX8630-XX
3 A B I C M O S V E R Y L O W 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 0.01 10 22 5.5 3
Units
V A F F
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, these specifications apply over the operating ambient temperatures for the LX8630-XXC with 0C TA 125C; 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.)
LX8630-33 Fixed 3.3V, 3A
Parameter
Output Voltage Line Regulation Load Regulation Dropout Voltage (VDO = VIN - VOUT)
Symbol
VOUT VREG IREG VDO
Test Conditions
TJ = 25C Over Temperature VIN = 3.9V to 5.5V IOUT = 10mA to 3A IOUT = 3A, VOUT = -1% IOUT = 1.5A, VOUT = -1% IOUT = 10mA, VOUT = -1% VOUT = 0V VOUT = VOUT - 1% IOUT = 10mA to 3A 0V < VIN < VOUT, VOUT < 3.4V (at VOUT) 0V < VIN < VOUT, VOUT < 3.4V (at VIN)
Min.
3.25 3.22
LX8630-33 Typ. Max.
3.3 2 18 0.4 0.3 0.05 5 4 400 50 0 3.35 3.38 8 40 0.6 0.4 0.15 6 5 600 650
Units
V V mV mV V V V A A A A mA
Short Circuit Current Current Limit Quiescent Current Reverse Leakage Current
ISC ICL IQ IREV
4 3
-50
LX8630-25 Fixed 2.5V, 3A
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 to 3A IOUT = 3A, VOUT = -1% IOUT = 1.5A, VOUT = -1% IOUT = 10mA, VOUT = -1% VOUT = 0V VOUT = VOUT - 1% IOUT = 10mA to 3A 0V < VIN < VOUT, VOUT < 2.6V (at VOUT) 0V < VIN < VOUT, VOUT < 2.6V (at VIN)
Min.
2.46 2.44
LX8630-25 Typ. Max.
2.5 2.5 2 14 0.4 0.3 0.05 5 4 400 50 0 2.54 2.56 6 30 0.6 0.45 0.15 6 5 600 650
Units
V V mV mV V V V A A A A mA
Short Circuit Current Current Limit Quiescent Current Reverse Leakage Current
ISC ICL IQ IREV
4 3
-50
Copyright (c) 2000 Rev. 0.6 4/00
3
PRODUCT DATABOOK 1996/1997
LX8630-XX
3 A B I C M O S V E R Y L O W 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)
LX8630-00 Adjustable Output, 3A
Parameter
Reference Voltage Line Regulation Load Regulation Dropout Voltage (VDO = VIN - VOUT)
Symbol
VREF VREG IREG VDO
Test Conditions
TJ = 25C Over Temperature VIN = (VO + 0.6V) to 5.5V @ ADJ Pin (Note 1) IOUT = 10mA to 3A @ ADJ Pin IOUT = 3A, VIN > 3V, VOUT 1% IOUT = 1.5A, VIN > 3V, VOUT 1% IOUT = 10mA, VIN > 3V, VOUT 1% VOUT = 0V VOUT = VOUT - 1V IOUT = 10mA to 3A 0V < VIN < VOUT, VOUT < 5.5V (at VOUT) 0V < VIN < VOUT, VOUT < 5.5V (at VIN)
Min.
1.23 1.22
LX8630-00 Typ. Max.
1.25 1.25 2 7 0.4 0.3 0.05 5 4 400 50 0 100 (VIN/2) 10 1.27 1.28 4 15 0.6 0.4 0.15 6 5 600 650
Units
V V mV mV V V V A A A A mA nA V A
Short Circuit Currnet Current Limit Quiescent Current Reverse Leakage Current Bias Current at ADJ Pin Shutdown Threshold Shutdown Current Note 1. VIN min. 2.5V.
ISC ICL IQ IREV IBIAS VSD ISD
4 3
-50 0.8
VENABLE < 0.8V
25
T Y P I C A L A P P L I C AT I O N
VIN
1
IN LX8630-00
OUT
5
VOUT R1 COUT R2
CIN
ENABLE
2
GND ADJ
3
4
VREF VOUT = VREF 1 + R1 R2
FIGURE 1 -- Typical Application
4
Copyright (c) 2000 Rev. 0.6 4/00
PRODUCT DATABOOK 1996/1997
LX8630-XX
3 A B I C M O S V E R Y L O W D R O P O U T R E G U L AT O R S
P
RELIMINARY
D
ATA
S
HEET
CHARACTERISTIC CURVES
350 300 - 25 C V-Dropout (mV) 250 200 150 100 50 0 0.1 0.5 + 25 C +125 C
LX8630-33CDD - 3.0 Amp LDO
1.0 1.5 2.0 Current Load (Amps)
2.5
3.0
FIGURE 2 -- Dropout Voltage vs. Output Current (Typical - LX8630-33CDD)
Copyright (c) 2000 Rev. 0.6 4/00
5
PRODUCT DATABOOK 1996/1997
LX8630-XX
3 A B I C M O S V E R Y L O W D R O P O U T R E G U L AT O R S
P
RELIMINARY
D
ATA
S
HEET
CHARACTERISTIC CURVES
VIN = 3.3V CHAN 1 (top trace) : VOUT 50mV/DIV at 2.5VDC CHAN 3 (lower trace): IOUT 1A/DIV w/ 10mA preload current Input Cap: 1 6MVGX 1500F Sanyo Cap Output Caps: 2 6MVGX 1500F Sanyo Cap
VIN = 5.0V CHAN 1 (top trace) : VOUT 50mV/DIV at 2.5VDC CHAN 3 (lower trace): IOUT 1A/DIV w/ 10mA preload current Input Cap: 1 6MVGX 1500F Sanyo Cap Output Caps: 2 6MVGX 1500F Sanyo Cap
FIGURE 4 -- LX8630-00CDD Transient Response
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.
6
Copyright (c) 2000 Rev. 0.6 4/00

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