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 T H E I N F I N I T E P O W E R I O F P N N O VA T I O N D R E L I M I N A R Y 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 150mΩ 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 400µA irrespective of load current, while the S A T A H E E T K E Y F E AT U R E S ■ Dropout Voltage Typically 450mV at 3A and 50mV at 10mA ■ Low Quiescent Current, Typically Under 400µA, irrespective of Load ■ Shutdown Current 10µA ■ Adjustable Output Version in 5-Pin TO-220 & TO-263 Packages ■ Fixed Outputs of 2.5V and 3.3V Available in 3-Pin TO-220 & TO-263 Packages ■ Low Reverse Leakage Current ■ Short-Circuit and Thermal Shutdown Protection shutdown current is only 10µA. 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 150°C. 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. A P P L I C AT I O N S ■ 1.8V & 2.5V Supplies for Memory, Microprocessors, Clock Circuits, Etc. ■ 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 IN C u rre n t L im it R e fe re n c e C u rre n t R O U T A A D J * C h a rg e P u m p R B 1 .2 5 V G N D E N A B L E V IN R /2 R e v e rs e V o lta g e S e n s e T h e rm a l S h u td o w n R A B L X 8 6 3 0 -0 0 - - L X 8 6 3 0 -2 5 2 5 k 2 5 k L X 8 6 3 0 -3 3 4 1 k 2 5 k * 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 LX8630-33CP — LX8630-33CDD — 0 to 125 2.5 LX8630-25CP — LX8630-25CDD — ADJ (00) — LX8630-00CP — LX8630-00CDD TO-220 P Plastic 3-pin TO-220 P Plastic 5-pin TO-263 DD Plastic 3-pin TO-263 DD Plastic 5-pin Note: All surface-mount packages are available in Tape & Reel, append the letter "T" to part number. (i.e. LX8630-xxCDDT) Copyright © 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 R E L I M I N A R Y A B S O L U T E M A X I M U M R AT I N G S D A T A S H E E T (Note 1) Input Voltage (VIN) ...................................................................................................... 6.5V Enable Pin .............................................................................................. -0.3V to VIN+0.3V Operating Junction Temperature Plastic (P & DD Packages) .................................................................................... 150°C Storage Temperature Range ...................................................................... -65°C to 150°C Lead Temperature (Soldering, 10 seconds) ............................................................. 300°C 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. PA C K A G E P I N O U T S (All packages are Top View) TAB IS GND 3 VOUT GND VIN 2 1 P PACKAGE (3-Pin) TAB IS GND VOUT ADJ GND ENABLE VIN 5 T H E R M A L D ATA P PACKAGE: (3-Pin) 1 THERMAL RESISTANCE-JUNCTION TO TAB, θJT 2.7°C/W THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA 60°C/W P PACKAGE (5-Pin) TAB IS GND P PACKAGE: (5-Pin) THERMAL RESISTANCE-JUNCTION TO TAB, θJT 2.7°C/W THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA 60°C/W DD PACKAGE: (3-Pin) THERMAL RESISTANCE-JUNCTION TO TAB, θJT 2.7°C/W THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA 60°C/W* 3 VOUT 2 GND 1 VIN DD PACKAGE (3-Pin) DD PACKAGE: (5-Pin) THERMAL RESISTANCE-JUNCTION TO TAB, θJT 2.7°C/W THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA 60°C/W Junction Temperature Calculation: TJ = TA + (PD x θJA). The θJA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow. * θJAcan be improved with package soldered to 0.5IN2 copper area over backside ground plane or internal power plane. θJAcan vary from 20ºC/W to > 40ºC/W depending on mounting technique. TAB IS GND 5 VOUT 4 ADJ 3 GND 2 ENABLE 1 VIN DD PACKAGE (5-Pin) FUNCTIONAL PIN DESCRIPTION Pin Designator 2 Description VIN Positive supply input for the regulator. Bypass to GND with at least 2.2µF of low ESR, ESL capacitance if supply source is further than 1 inch from the device. VOUT Output for the regulator. It is recommended to bypass to GND with at least 10µF 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. GND 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. ADJ 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 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. Copyright © 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 R E L I M I N A R Y D A T A S H E E T 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 Symbol Input Voltage Load Current (with adequate heatsinking) Input Capacitor (VIN to GND) Output Capacitor (VOUT to GND) VIN Recommended Operating Conditions Min. Typ. Max. 2.5 0.01 10 22 5.5 3 Units V A µF µF ELECTRICAL CHARACTERISTICS (Unless otherwise specified, these specifications apply over the operating ambient temperatures for the LX8630-xxC with 0°C ≤ TA ≤ 125°C; VIN = VOUT + 1.5V; IOUT = 10mA; CIN = 10µF; COUT = 22µF; 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 Symbol Output Voltage VOUT Line Regulation Load Regulation Dropout Voltage (VDO = VIN - VOUT) VREG IREG VDO Short Circuit Current Current Limit Quiescent Current Reverse Leakage Current ISC ICL IQ IREV Test Conditions TJ = 25°C 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 4 3 -50 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 µA µA mA LX8630-25 Fixed 2.5V, 3A Parameter Symbol Output Voltage VOUT Line Regulation Load Regulation Dropout Voltage (VDO = VIN - VOUT) VREG IREG VDO Short Circuit Current Current Limit Quiescent Current Reverse Leakage Current ISC ICL IQ IREV Copyright © 2000 Rev. 0.6 4/00 Test Conditions TJ = 25°C 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 4 3 -50 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 µA µA mA 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 R E L I M I N A R Y D A T A S H E E T 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 Symbol Reference Voltage VREF Line Regulation Load Regulation Dropout Voltage (VDO = VIN - VOUT) VREG IREG VDO Short Circuit Currnet Current Limit Quiescent Current Reverse Leakage Current ISC ICL IQ IREV Bias Current at ADJ Pin Shutdown Threshold Shutdown Current IBIAS VSD ISD Test Conditions Min. 1.23 1.22 TJ = 25°C 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) 4 3 -50 0.8 VENABLE < 0.8V 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 25 Units V V mV mV V V V A A µA µA mA nA V µA Note 1. VIN min. ≥ 2.5V. T Y P I C A L A P P L I C AT I O N VIN 1 OUT IN LX8630-00 CIN ENABLE 2 GND ADJ VOUT 5 R1 4 3 COUT R2 VREF VOUT = VREF 1 + R1 R2 FIGURE 1 — Typical Application 4 Copyright © 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 R E L I M I N A R Y D A T A S H E E T CHARACTERISTIC CURVES LX8630-33CDD - 3.0 Amp LDO 350 300 V-Dropout (mV) - 25 C 250 + 25 C +125 C 200 150 100 50 0 0.1 0.5 1.0 1.5 2.0 Current Load (Amps) 2.5 3.0 FIGURE 2 — Dropout Voltage vs. Output Current (Typical - LX8630-33CDD) Copyright © 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 R E L I M I N A R Y D A T A S H E E T 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 1500µF Sanyo Cap Output Caps: 2 6MVGX 1500µF 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 1500µF Sanyo Cap Output Caps: 2 6MVGX 1500µF 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 © 2000 Rev. 0.6 4/00