View LM4041BEX3-12T_481763.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

19-1704; Rev 5; 1/09
Improved Precision Micropower Shunt Voltage Reference
General Description
The LM4041 is a precision two-terminal shunt mode, bandgap voltage reference with a fixed reverse breakdown voltage of 1.225V. Ideal for space-critical applications, the LM4041 is offered in the subminiature 3-pin SC70 surface-mount package (1.8mm 1.8mm), 50% smaller than comparable devices in SOT23 surfacemount packages (SOT23 versions are also available). Laser-trimmed resistors ensure precise initial accuracy. With a 100ppm/C temperature coefficient, the device is offered in four grades of initial accuracy ranging from 0.1% to 1%. The LM4041 has a 60A to 12mA shunt current capability with low dynamic impedance, ensuring stable reverse-breakdown voltage accuracy over a wide range of operating temperatures and currents. The LM4041 does not require an external stabilizing capacitor while ensuring stability with any capacitive load. The LM4041 is guaranteed over the temperature range -40C to +125C.
Features
Ultra-Small 3-Pin SC70 Package 0.1% (max) Initial Accuracy 100ppm/C (max) Temperature Coefficient Guaranteed over -40C to +125C Temperature Range Wide Operating Current Range: 60A to 12mA Low 20VRMS Output Noise (10Hz to 10kHz) 1.225V Fixed Reverse Breakdown Voltage No Output Capacitors Required Tolerates Capacitive Loads
LM4041
Ordering Information
PART LM4041AIX3-1.2+T LM4041AIM3-1.2+T LM4041AEX3-1.2+T LM4041AEM3-1.2+T LM4041BIX3-1.2+T LM4041BIM3-1.2+T TEMP RANGE -40C to +85C -40C to +85C -40C to +125C -40C to +125C -40C to +85C -40C to +85C -40C to +125C -40C to +125C -40C to +85C -40C to +85C -40C to +125C -40C to +125C -40C to +85C -40C to +85C -40C to +125C -40C to +125C PINTOP PACKAGE MARK 3 SC70-3 3 SOT23-3 3 SC70-3 3 SOT23-3 3 SC70-3 3 SOT23-3 3 SC70-3 3 SOT23-3 3 SC70-3 3 SOT23-3 3 SC70-3 3 SOT23-3 3 SC70-3 3 SOT23-3 3 SC70-3 3 SOT23-3 ABF FZEB ALB FZNC ABG FZEC ALC FZND ABH FZED ALD FZNE ABI FZEE ALE FZNF
________________________Applications
Portable, Battery-Powered Equipment Notebook Computers Cell Phones Industrial Process Controls
LM4041BEX3-1.2+T LM4041BEM3-1.2+T LM4041CIX3-1.2+T LM4041CIM3-1.2+T LM4041CEX3-1.2+T LM4041CEM3-1.2+T LM4041DIX3-1.2+T LM4041DIM3-1.2+T LM4041DEX3-1.2+T LM4041DEM3-1.2+T
Pin Configuration
TOP VIEW
Note: For leaded version, contact factory. *See Selector Guide for a listing of LM4041 Output Voltage, Initial Accuracy, and Temperature Coefficient specifications. +Denotes a lead(Pb)-free/RoHS-compliant package.
+
1
Selector Guide
LM4041
3 N.C.*
PART LM4041A___-1.2-T
-2
INITIAL ACCURACY (%) 0.1 0.2 0.5 1.0
OUTPUT VOLTAGE (V) 1.225 1.225 1.225 1.225
TEMPCO (ppm/C) 100 100 100 150
SC70-3/SOT23-3
*PIN 3 MUST BE LEFT FLOATING OR CONNECTED TO PIN 2.
LM4041B___-1.2-T LM4041C___-1.2-T LM4041D___-1.2-T
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
Improved Precision Micropower Shunt Voltage Reference LM4041
ABSOLUTE MAXIMUM RATINGS
Reverse Current (cathode to anode) ..................................20mA Forward Current (anode to cathode) ..................................10mA Continuous Power Dissipation (TA = +70C) 3-Pin SC70 (derate 2.17mW/C above +70C) ............174mW 3-Pin SOT23 (derate 4.01mW/C above +70C)..........320mW Operating Temperature Range LM4041_I_ _ _..................................................-40C to +85C LM4041_E_ _ _ ..............................................-40C to +125C Storage Temperature Range .............................-65C to +150C Junction Temperature ......................................................+150C Lead Temperature (soldering, 10s) ................................+300 C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(IR = 100A, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER SYMBOL CONDITIONS LM4041A (0.1%) Reverse Breakdown Voltage VR TA = +25C LM4041B (0.2%) LM4041C (0.5%) LM4041D (1.0%) LM4041A (0.1%) Reverse Breakdown Voltage Tolerance (Note 2) VR LM4041B (0.2%) LM4041C (0.5%) LM4041D (1.0%) Minimum Operating Current IRMIN IR = 10mA Average Reverse Voltage Temperature Coefficient (Notes 2 and 3) VR/T IR = 1mA IR = 100A Reverse Breakdown Voltage Change with Operating Current Change Reverse Dynamic Impedance (Note 3) IRMIN IR 1mA VR/IR 1mA IR 12mA ZR IR = 1mA, f = 120Hz, IAC = 0.1IR LM4041A/B/C LM4041D LM4041A/B/C LM4041D LM4041A/B/C LM4041D LM4041A/B/C LM4041D LM4041A/B/C LM4041D MIN 1.2238 1.2226 1.2189 1.2128 TYP 1.2250 1.2250 1.2250 1.2250 1.2 2.4 6.0 12 45 45 20 15 15 15 0.7 0.7 2.5 2.5 0.5 0.5 1.5 2.0 8.0 10.0 1.5 2.0 mV 100 150 ppm/C MAX 1.2262 1.2275 1.2311 1.2373 9.2 10.4 14 24 60 65 A mV V UNITS
2
_______________________________________________________________________________________
Improved Precision Micropower Shunt Voltage Reference
ELECTRICAL CHARACTERISTICS (continued)
(IR = 100A, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER Wideband Noise Reverse Breakdown Voltage Long-Term Stability SYMBOL eN VR CONDITIONS IR = 100A, 10Hz f 10kHz T = 1000h, IR = 100A MIN TYP 20 120 MAX UNITS VRMS ppm
LM4041
Note 1: All devices are 100% production tested at +25C and are guaranteed by design for TA = TMIN to TMAX, as specified. Note 2: The overtemperature limit for Reverse Breakdown Voltage Tolerance is defined as the room-temperature Reverse Breakdown Voltage Tolerance [(VR / T)(maxT)(VR)], where VR / T is the VR temperature coefficient, maxT is the maximum difference in temperature from the reference point of +25C to TMIN or TMAX, and VR is the reverse breakdown voltage. The total overtemperature tolerance for the different grades in the temperature range where maxT = +65C is shown below: A grade: 0.75% = 0.1% 100ppm/C 65C B grade: 0.85% = 0.2% 100ppm/C 65C C grade: 1.15% = 0.5% 100ppm/C 65C D grade: 1.98% = 1.0% 150ppm/C 65C The total overtemperature tolerance for the different grades in the extended temperature range where maxT = +100C is shown below: A grade: 1.1% = 0.1% 100ppm/C 100C B grade: 1.2% = 0.2% 100ppm/C 100C C grade: 1.5% = 0.5% 100ppm/C 100C D grade: 2.5% = 1.0% 150ppm/C 100C Therefore, as an example, the A-grade LM4041-1.2 has an overtemperature reverse breakdown voltage tolerance of 2.5V x 0.75% = 19mV. Note 3: Guaranteed by design.
Typical Operating Characteristics
(IR = 100A, SC70-3 package, TA = +25C, unless otherwise noted.)
REVERSE CHARACTERISTICS AND MINIMUM OPERATING CURRENT
LM4041-01
TEMPERATURE DRIFT
LM4041 toc02
REVERSE VOLTAGE vs. CURRENT
LM4041 toc03
100
1 REFERENCE VOLTAGE CHANGE (mV)
6 REVERSE VOLTAGE CHANGE (mV) 5 4 3 2 TA = -40C 1 0 TA = +85C TA = +125C TA = +25C
80 REVERSE CURRENT (A)
0
60
-1
40
20
-2
0 0 0.4 0.8 1.2 1.6 2.0 REVERSE VOLTAGE (V)
-3 -50 -25 0 25 50 75 100 125 TEMPERATURE (C)
0
5
10
15
20
SOURCE CURRENT (mA)
_______________________________________________________________________________________
3
Improved Precision Micropower Shunt Voltage Reference LM4041
Typical Operating Characteristics (continued)
(IR = 100A, SC70-3 package, TA = +25C, unless otherwise noted.)
LOAD-TRANSIENT RESPONSE
LM4041-04
LOAD-TRANSIENT RESPONSE
LM4041-05
LOAD-TRANSIENT RESPONSE
LM4041-06
VGEN
VGEN
2V/div
2V/div
VGEN
2V/div
VR (AC-COUPLED)
VR (AC-COUPLED)
2mV/div ISHUNT = 100A 25A, RL = 100k SEE FIGURE 1 10s/div
ISHUNT = 1mA 250A, RL = 10k SEE FIGURE 1 10s/div
VR
2mV/div
2mV/div ISHUNT = 10mA 2.5mA, RL = 1k SEE FIGURE 1 10s/div
STARTUP CHARACTERISTICS
LM4041-07
OUTPUT IMPEDANCE vs. FREQUENCY
LM4041-08
NOISE vs. FREQUENCY
IR = 200A
LM4041-09
5V VIN OV
RS = 30k SEE FIGURE 2
1000 C1 = 0 100 IMPEDANCE ()
10,000
NOISE (nV/Hz) C1 = 1F IR = 1mA
1.5V 1.0V VOUT O.5V 0V
1000
10
IR = 150A
1 0.1 0 4 8 12 16 100 1k RESPONSE TIME (s)
100 100k 1M 10 100 1k 10k FREQUENCY (Hz)
10k FREQUENCY (Hz)
ISHUNT 1k RL VR VGEN VIN 1Hz RATE
RS 30k
VB
+ -
VR
Figure 1. Load-Transient Test Circuit
Figure 2. Startup Characteristics Test Circuit
4
_______________________________________________________________________________________
Improved Precision Micropower Shunt Voltage Reference
Pin Description
PIN 1 2 3 NAME + - N.C. Positive Terminal of the Shunt Reference Negative Terminal of the Shunt Reference Leave this pin unconnected, or connect to pin 2. FUNCTION
LM4041
Detailed Description
The LM4041 shunt references use the bandgap principle to produce a stable, accurate voltage. The device behaves similarly to an ideal zener diode; a fixed voltage of +1.225V is maintained across its output terminals when biased with 60A to 12mA of reverse current. The LM4041 behaves similarly to a silicon diode when biased with forward currents up 10mA. Figure 3 shows a typical operating circuit. The LM4041 is ideal for providing a stable reference from a highvoltage power supply.
VS ISHUNT + ILOAD ILOAD VR ISHUNT
RS
Applications Information
The LM4041's internal pass transistor is used to maintain a constant output voltage (VSHUNT) by sinking the necessary amount of current across a source resistor. The source resistance (RS) is determined from the load current (ILOAD) range, supply voltage (VS) variations, VSHUNT, and desired quiescent current. Choose the value of RS when VS is at a minimum and ILOAD is at a maximum. Maintain a minimum ISHUNT of 60A at all times. The RS value should be large enough to keep ISHUNT less than 12mA for proper regulation when VS is maximum and ILOAD is at a minimum. To prevent damage to the device, ISHUNT should never exceed 20mA. Therefore, the value of RS is bounded by the following equation: [VS(MIN) - VR ] / [60A + ILOAD(MAX)] > RS > [VS(MAX) - VR ] / [20mA + ILOAD(MIN)] Choosing a larger resistance minimizes the total power dissipation in the circuit by reducing the shunt current (PD(TOTAL) = VS ISHUNT). Provide a safety margin to incorporate the worst-case tolerance of the resistor
LM4041
Figure 3. Typical Operating Circuit
used. Ensure that the resistor's power rating is adequate, using the following general power equation: PR = ISHUNT (VS(MAX) - VR)
Output Capacitance
The LM4041 does not require an external capacitor for frequency stability and is stable for any output capacitance.
Temperature Performance
The LM4041 typically exhibits an output voltage temperature coefficient within 15ppm/C. The polarity of the temperature coefficient may be different from one device to another; some may have positive coefficients, and others may have negative coefficients.
_______________________________________________________________________________________
5
Improved Precision Micropower Shunt Voltage Reference LM4041
High Temperature Operation
The maximum junction temperature of the LM4041 is +150C. The maximum operating temperature for the LM4041_E_ is +125C. At a maximum load current of 15mA and a maximum output voltage of 5V, the part will dissipate 75mW of power. The power dissipation limits of the 3-pin SC70 call for a derating value of 2.17mW/C above +70C and thus for 75mW of power dissipation, the part will selfheat to 35.56C above ambient temperature. If the ambient temperature is +125C, the part operates at 159.56C, thereby exceeding the maximum junction temperature value of +150C. For high-temperature operation, care must be taken to ensure the combination of ambient temperature, output power dissipation, and package thermal resistance does not conspire to raise the device temperature beyond that listed in the Absolute Maximum Ratings. Either reduce the output load current or the ambient temperature to keep the part within the limits.
Chip Information
TRANSISTOR COUNT: 60 PROCESS: BiCMOS
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a "+", "#", or "-" in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE 3 SC70-3 3 SOT23-3 PACKAGE CODE X3-2 U3-1 DOCUMENT NO. 21-0075 21-0051
6
_______________________________________________________________________________________
Improved Precision Micropower Shunt Voltage Reference
Revision History
REVISION NUMBER 5 REVISION DATE 1/09 DESCRIPTION Changed part numbers to indicate lead-free PAGES CHANGED 1
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 7 (c) 2010 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.

▲Up To Search▲

Price & Availability of LM4041BEX3-12T

	To Download LM4041BEX3-12T Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .