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LM4040
PRECISION MICROPOWER SHUNT VOLTAGE REFERENCES
Description
The LM4040 is a family of bandgap circuits designed to achieve precision micro-power voltage references of 2.5V, 3.0V and 5.0V. The devices are available in 0.2% B-grade, 0.5% C-grade and 1% D-grade initial tolerances. They are available in small outline SOT23 and SC70-5 surface mount packages which are ideal for applications where space is at a premium. Excellent performance is maintained over the 60A to 15mA operating current range with a typical temperature coefficient of only 20ppm/C. The device has been designed to be highly tolerant of capacitive loads so maintaining excellent stability. This device offers a pin for pin compatible alternative to the LM4040 voltage reference.
Pin Assignments
LM4040 F (SOT23) Cathode 3
1*
Anode 2
Top view
* Pin 1 must be left floating or connected to pin 2
LM4040 H5 (SC70-5) Anode 1
4 N/C
Features
* * * Small packages: SOT23 & SC70-5 No output capacitor required Output voltage tolerance o LM4040B 0.2% at 25C o LM4040C 0.5% at 25C o LM4040D 1% at 25C Low output noise (10Hz to 10kHz) .............. 45VRMS Wide operating current range 60A to 15mA Extended temperature range -40C to +125C Low temperature coefficient 100 ppm/C (max)
*
2 5 N/C
Top View
Cathode 3
* Pin 2 must be left floating or connected to pin 1
* * * * *
Applications
* * * * * * Battery powered equipment Precision power supplies Portable instrumentation Portable communications devices Notebook and palmtop computers Data acquisition systems
LM4040
Document number: DS33195 Rev. 5 - 2
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LM4040 Absolute Maximum Ratings (Voltages to GND Unless Otherwise Stated)
Parameter Continuous Reverse Current Continuous Forward Current Operating Junction Temperature Storage Temperature Rating 20 10 -40 to 150 -55 to 150 Unit mA mA C C
Operation above the absolute maximum rating may cause device failure. Operation at the absolute maximum rating, for extended periods, may reduce device reliability. Unless otherwise stated voltages specified are relative to the ANODE pin.
Package Thermal Data
Package SOT23 SC70-5 JA 380C/W 380C/W PDIS TAMB = 25C, TJ = 150C 330mW 330mW
Recommended Operating Conditions
Reverse Current Operating Ambient Temperature Range Min. 0.06 -40 Max. 15 125 Units mA C
Electrical Characteristics
LM4040-2.5 Symbol Parameter Reverse breakdown voltage VREF Reverse breakdown voltage tolerance Minimum operating current Average reverse breakdown voltage temperature coefficient
(Test conditions: Tamb = 25C, unless otherwise specified.)
Conditions TAMB IR = 100A IR = 100A 25C 25C -40 to 85C -40 to 125C 25C -40 to 85C -40 to 125C -40 to 125C
Typ. 2.5
LM4040 B Limits
LM4040 C Limits
LM4040 D Limits
Units V
45
IRMIN VR/T
5 21 30 60 65 68 100 0.8 1.0 1.0 6.0 8.0 8.0 0.8
12 29 38 60 65 68 100 0.8 1.0 1.0 6.0 8.0 8.0 0.9
25 49 63 65 70 73 150 1.0 1.2 1.2 8.0 10.0 10.0 1.1
mV
A
IR = 10mA IR = 1mA IR = 100A IRMIN IR < 1mA
VR/IR
Reverse breakdown change with current
ZR en VR VHYST
Dynamic output impedance Noise voltage Long term stability (non cumulative) Themal hysteresis
25C -40 to 85C -40 to 125C 25C 1mA < IR -40 to 85C < 15mA -40 to 125C IR = 1mA, f = 120Hz IAC = 0.1IR IR = 100A 10Hz < f < 10kHz t = 1000Hrs IR = 100A T = -40C to =125C
20 15 15 0.3
ppm/C
2.5
mV
0.3 35 120 0.08
VRMS ppm %
LM4040
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LM4040 Electrical Characteristics (Continued)
LM4040-3.0 Symbol Parameter Reverse breakdown voltage VREF Reverse breakdown voltage tolerance Minimum operating current Average reverse breakdown voltage temperature coefficient IR = 10mA IR = 1mA IR = 100A IRMIN IR < 1mA Conditions TAMB IR = 100A IR = 100A 25C 25C -40 to 85C -40 to 125C 25C -40 to 85C -40 to 125C -40 to 125C Typ. 3.0 6 26 TBD 62 67 70 100 0.8 1.1 1.1 6.0 9.0 9.0 0.9 15 34 45 62 67 70 100 0.8 110 1.1 6.0 9.0 9.0 0.9 30 59 75 67 72 75 150 1.0 1.3 1.3 8.0 11.0 11.0 1.2 LM4040 B Limits LM4040 C Limits LM4040 D Limits Units V mV
(Test conditions: Tamb = 25C, unless otherwise specified.)
47
IRMIN VR/T
A
VR/IR
Reverse breakdown change with current
ZR en VR VHYST LM4040-5.0 Symbol
Dynamic output impedance Noise voltage Long term stability (non cumulative) Themal hysteresis
25C -40 to 85C -40 to 125C 25C 1mA < IR -40 to 85C < 15mA -40 to 125C IR = 1mA, f = 120Hz IAC = 0.1IR IR = 100A 10Hz < f < 10kHz t = 1000Hrs IR = 100A T = -40C to =125C
20 15 15 0.4
ppm/C
2.7
mV
0.4 35 120 0.08
VRMS ppm %
Parameter Reverse breakdown voltage
Conditions TAMB IR = 100A IR = 100A 25C 25C -40 to 85C -40 to 125C 25C -40 to 85C -40 to 125C -40 to 125C
Typ. 5.0
LM4040 B Limits
LM4040 C Limits
LM4040 D Limits
Units V
VREF
Reverse breakdown voltage tolerance Minimum operating current Average reverse breakdown voltage temperature coefficient
54
IRMIN VR/T
10 43 60 74 80 83 100 1.0 1.4 1.4 8.0 12.0 12.0 1.1
25 58 75 74 80 83 100 1.0 1.4 1.4 8.0 12.0 12.0 1.1
50 99 125 79 85 88 150 1.3 1.8 1.8 10.0 15.0 15.0 1.5
mV
A
IR = 10mA IR = 1mA IR = 100A IRMIN IR < 1mA
VR/IR
Reverse breakdown change with current
ZR en VR VHYST
Dynamic output impedance Noise voltage Long term stability (non cumulative) Themal hysteresis
25C -40 to 85C -40 to 125C 25C 1mA < IR -40 to 85C < 15mA -40 to 125C IR = 1mA, f = 120Hz IAC = 0.1IR IR = 100A 10Hz < f < 10kHz t = 1000Hrs IR = 100A T = -40C to =125C
30 20 20 0.5
ppm/C
3.5
mV
0.5 80 120 0.08
VRMS ppm %
LM4040
Document number: DS33195 Rev. 5 - 2
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LM4040 Typical Characteristics LM4040-2.5
LM4040
Document number: DS33195 Rev. 5 - 2
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LM4040 Typical Characteristics LM4040-3.0
LM4040
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LM4040 Typical Characteristics LM4040-5.0
LM4040
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LM4040 Start Up Characteristics LM4040-2.5, 3.0 and 5.0
LM4040
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LM4040 Application Information
In a conventional shunt regulator application (Figure 1), an external series resistor (RS) is connected between the supply voltage, VS, and the LM4040. RS determines the current that flows through the load (IL) and the LM4040 (IR). Since load current and supply voltage may vary, RS should be small enough to supply at least the minimum acceptable IR to the LM4040 even when the supply voltage is at its minimum and the load current is at its maximum value. When the supply voltage is at its maximum and IL is at its minimum, RS should be large enough so that the current flowing through the LM4040 is less than 15 mA. RS is determined by the supply voltage, (VS), the load and operating current, (IL and IR), and the LM4040's reverse breakdown voltage, VR.
VS IR + IL RS IL VR IR
RS =
VS - VR IL + IR
Printed circuit board layout considerations
LM4040s in the SOT23 package have the die attached to pin 1, which results in an electrical contact between pin 2 and pin 3. Therefore, pin 1 of the SOT-23 package must be left floating or connected to pin 2. LM4040s in the SC70-5 package have the die attached to pin 2, which results in an electrical contact between pin 2 and pin 1. Therefore, pin 2 must be left floating or connected to pin1.
Ordering Information
25C Tol Voltage (V) 2.5 0.2% 3.0 5.0 2.5 0.5% 3.0 5.0 2.5 1% 3.0 5.0 Order Code LM4040B25FTA LM4040B25H5TA LM4040B30FTA LM4040B30H5TA LM4040B50FTA LM4040B50H5TA LM4040C25FTA LM4040C25H5TA LM4040C30FTA LM4040C30H5TA LM4040C50FTA LM4040C50H5TA LM4040D25FTA LM4040D25H5TA LM4040D30FTA LM4040D30H5TA LM4040D50FTA LM4040D50H5TA Package SOT23 SC70-5 SOT23 SC70-5 SOT23 SC70-5 SOT23 SC70-5 SOT23 SC70-5 SOT23 SC70-5 SOT23 SC70-5 SOT23 SC70-5 SOT23 SC70-5 Part Mark R2B R2B R3B R3B R5B R5B R2C R2C R3C R3C R5C R5C R2D R2D R3D R3D R5D R5D Reel Size 180mm 180mm 180mm 180mm 180mm 180mm 180mm 180mm 180mm 180mm 180mm 180mm 180mm 180mm 180mm 180mm 180mm 180mm Tape Width 8mm 8mm 8mm 8mm 8mm 8mm 8mm 8mm 8mm 8mm 8mm 8mm 8mm 8mm 8mm 8mm 8mm 8mm Quantity per Reel 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000
7", 7", 7", 7", 7", 7", 7", 7", 7", 7", 7", 7", 7", 7", 7", 7", 7", 7",
LM4040
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LM4040 Package Outline Dimensions SOT23
E
e b 3 leads e1
L1
E1
D
A A1 L c
Dim. A A1 b c D e
Millimeters Min Max 1.12 0.01 0.10 0.30 0.50 0.085 0.20 2.80 3.04 0.95 NOM
Inches Min Max 0.044 0.0004 0.004 0.012 0.020 0.003 0.008 0.110 0.120 0.037 NOM
Dim. e1 E E1 L L1 -
Millimeters Min Max 1.90 NOM 2.10 2.64 1.20 1.40 0.25 0.60 0.45 0.62 -
Inches Min Max 0.075 NOM 0.083 0.104 0.047 0.055 0.0098 0.0236 0.018 0.024 -
Note: Controlling dimensions are in millimeters. Approximate dimensions are provided in inches
SC70-5
Dim. A A1 A2 b C D
Millimeters Min Max 0.80 1.10 0.10 0.80 1.00 0.15 0.30 0.08 0.25 2.00 BSC
Inches Min Max 0.0315 0.0433 0.0039 0.0315 0.0394 0.006 0.0118 0.0031 0.0098 0.0787 BSC
Dim. E E1 e e1 L a
Millimeters Min Max 2.10 BSC 1.25 BSC 0.65 BSC 1.30 BSC 0.26 0.46 0 8
Inches Min Max 0.0826 BSC 0.0492 BSC 0.0255 BSC 0.0511 BSC 0.0102 0.0181 0 8
Note: Controlling dimensions are in millimeters. Approximate dimensions are provided in inches
LM4040
Document number: DS33195 Rev. 5 - 2
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LM4040
IMPORTANT NOTICE
DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated website, harmless against all damages. Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel. Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application. Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings noted herein may also be covered by one or more United States, international or foreign trademarks.
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Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein: A. Life support devices or systems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in significant injury to the user. B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness. Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systemsrelated information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems. Copyright (c) 2010, Diodes Incorporated
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LM4040
Document number: DS33195 Rev. 5 - 2
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