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LDS102P
Low-Voltage Ref/Amplifier
SOT23-5 Package
Product Specification Revision 1.4 February 08, 2008
General Description
The LDS102P is a low voltage combined reference/amplifier suited for the control loop of low voltage power supplies. In order to allow operation down to very low voltages, the error amplifier output and the supply terminal have been isolated to separate functional pins. The nominal reference voltage is 600 mV, the COMP output can sink 20mA at 300mV. Functionally, the LDS120 can be applied similarly to industry standard TL431, except that the reference is 600 mV and this requires a separate Vcc connection to a supply above 2.2V. Additionally, the output of the LDS120 can swing close to ground.
Applications * Power supply control loop * Power supply supervisory functions * Replacement for the MAX8515 Features * Low input voltage reference * 600mV high accuracy voltage reference * Low TC voltage reference * High PSRR and line regulation * Low current consumption * Zero offset error amplifier * Open collector output * RoHS compliant
Block Diagram
Pin Configuration
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Rev. 1.4 February 08, 2008
Leadis Technology Inc.
LDS102P
Typical Application
Pin Descriptions
Pin 1 2 3 4 5 Pin Name FB GND COMP N/C VCC Function Inverting input to error amplifier; will have threshold of 600mV. Ground Output of error amplifier; 20 mA source/sink capability Positive supply
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Rev. 1. 4 February 08, 2008
Leadis Technology Inc.
LDS102P
Absolute Maximum Ratings
Parameter VCC Voltage COMP Voltage REF Voltage VCC, COMP, REF Current Operating Junction Temperature Lead Temperature (soldering 10 seconds) Storage Temperature Range Value 20 20 20 50 150 260 -65 to +150 Units V V V mA C C C
Electrical Specifications
Electrical characteristics are guaranteed over the full temperature range -40C www.leadis.com
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Rev. 1. 4 February 08, 2008
Leadis Technology Inc.
LDS102P
Typical Performance Characteristics
Line regulation (at 1mA)
0.4 Output voltage change (mV) 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 2.2 6 10 14 18 Supply voltage (V)
Output voltage change (mV) 6 5 4 3 2 1 0 1
Load regulation
5
10 Load current (mA)
15
20
Supply current vs load current 300 280 Supply current (uA) 260 240
PSRR (dB)
Power-supply rejection ratio vs frequency
-50 -55 -60 -65 -70 -75 -80 -85 -90 -95 -100 0.1 1 10 100 1000 10000 100000
220 200 180 160 140 120 100 0 5 10 15 20 Load current (m A)
Frequency (Hz)
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Rev. 1. 4 February 08, 2008
Leadis Technology Inc.
LDS102P
Typical Performance Characteristics (contd.)
FB Bias current vs Tem perature Vcc=2.5V
630 Vref@10mA
0
Reference voltage (V)
620 610 600 590 580 570 -40 0 40 80 120 Temperature (degrees C)
-10 FB bias current (nA) -20 -30 -40 -50 -60 -70 -40 0 40 80 120
Tem perature (degrees C)
Gain vs. Frequency
110 90 70 Gain (dB) 50 30 10 -10
0.01
0.1
1
10
100
1000 10000
Frequency (KHz)
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Rev. 1. 4 February 08, 2008
Leadis Technology Inc.
LDS102P
Package Dimensions SOT23-3, SOT23-4, SOT23-5, SOT23-6
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Rev. 1. 4 February 08, 2008
Leadis Technology Inc.
LDS102P
Ordering Information
Device LDS102P
Note: Lead
Operating Tj -40C 105C
%Tol 1.0
Pkg Type SOT-23-5
VOUT 0.6V
Wrap T&R
Ordering Number LDS102BY-M5-06-TL
Free and RoHS compliant.
Warranty and Use LEADIS TECHNOLOGY MAKES NO WARRANTY, REPRESENTATION OR GUARANTEE, EXPRESS OR IMPLIED, REGARDING THE SUITABILITY OF ITS PRODUCTS FOR ANY PARTICULAR PURPOSE, NOR THAT THE USE OF ITS PRODUCTS WILL NOT INFRINGE ITS INTELLECTUAL PROPERTY RIGHTS OR THE RIGHTS OF THIRD PARTIES WITH RESPECT TO ANY PARTICULAR USE OR APPLICATION AND SPECIFICALLY DISCLAIMS ANY AND ALL LIABILITY ARISING OUT OF ANY SUCH USE OR APPLICATION, INCLUDING BUT NOT LIMITED TO, CONSEQUENTIAL OR INCIDENTAL DAMAGES. Leadis Technology products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Leadis Technology product could create a situation where personal injury or death may occur. Leadis Technology reserves the right to make changes to or discontinue any product or service described herein without notice. Products with data sheets labeled "Advance Information" or "Preliminary" and other products described herein may not be in production or offered for sale. Leadis Technology advises customers to obtain the current version of the relevant product information before placing orders. Circuit diagrams illustrate typical semiconductor applications and may not be complete.
Leadis Technology 800 W. California Ave, Suite 200 Sunnyvale, CA 94086 Phone: 408.331.8600 Fax: 408.331.8601 http://www.leadis.com www.leadis.com 7
Document No: 102LDS Revision: 1.4 Issue date: 2/08/08 Rev. 1. 4 February 08, 2008

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