View MAXIM_196399.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

19-1704; Rev 0; 4/00
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.
PART* LM4041AIX3-1.2 LM4041AIM3-1.2
Features
o Ultra-Small 3-Pin SC70 Package o 0.1% max Initial Accuracy o 100ppm/C max Temperature Coefficient Guaranteed over -40C to +85C Temperature Range o Wide Operating Current Range: 60A to 12mA o Low 20VRMS Output Noise (10Hz to 10kHz) o 1.225V Fixed Reverse Breakdown Voltage o No Output Capacitors Required o Tolerates Capacitive Loads
LM4041
Ordering Information
TEMP. RANGE -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C PINPACKAGE 3 SC70-3 3 SOT23-3 3 SC70-3 3 SOT23-3 3 SC70-3 3 SOT23-3 3 SC70-3 3 SOT23-3 TOP MARK ABF FZEB ABG FZEC ABH FZED ABI FZEE
________________________Applications
Portable, Battery-Powered Equipment Notebook Computers Cell Phones Industrial Process Controls
LM4041BIX3-1.2 LM4041BIM3-1.2 LM4041CIX3-1.2 LM4041CIM3-1.2 LM4041DIX3-1.2 LM4041DIM3-1.2
*See Selector Guide for a listing of LM4041 Output Voltage, Initial Accuracy, and Temperature Coefficient specifications.
Pin Configuration
TOP VIEW
+ 1
Selector Guide
PART LM4041AIM3-1.2 OUTPUT VOLTAGE (V) 1.225 1.225 1.225 1.225 1.225 1.225 1.225 1.225 INITIAL ACCURACY (%) 0.1 0.1 0.2 0.2 0.5 0.5 1.0 1.0 TEMPCO (ppm/C) 100 100 100 100 100 100 150 150
LM4041
-2
3
N.C.*
LM4041AIX3-1.2 LM4041BIM3-1.2 LM4041BIX3-1.2 LM4041CIM3-1.2 LM4041CIX3-1.2 LM4041DIM3-1.2 LM4041DIX3-1.2
SC70-3/SOT23-3
*PIN 3 MUST BE LEFT FLOATING OR CONNECTED TO PIN 2.
________________________________________________________________ MAXIM Integrated Products
1
For free samples and the latest literature, visit www.MAXIM-ic.com or phone 1-800-998-8800. For small orders, phone 1-800-835-8769.
Improved Precision Micropower Shunt Voltage Reference LM4041
ABSOLUTE MAXIMUM RATINGS
Reverse Current (cathode to anode) ..................................20mA Forward Current (anode to cathode) ..................................10mA ESD per Method 3015.7 Human Body Model .......................................................2000V Machine Model.................................................................200V 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 ..........................-40C to +85C 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 Reverse Breakdown Voltage Reverse Breakdown Voltage Tolerance (Note 2) SYMBOL VR TA = +25C LM4041A (0.1%) VR LM4041B (0.2%) LM4041C (0.5%) LM4041D (1.0%) Minimum Operating Current IRMIN IR = 10mA Average Reverse Voltage Temperature Coefficient (Note 2) VR/T IR = 1mA IR = 100A Reverse Breakdown Voltage Change with Operating Current Change Reverse Dynamic Impedance (Note 3) Wideband Noise Reverse Breakdown Voltage Long-Term Stability IRMIN IR 1mA VR/IR 1mA IR 12mA ZR eN VR 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 CONDITIONS MIN TYP 1.225 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 20 120 1.5 2.0 8.0 10.0 1.5 2.0 VRMS ppm mV 100 150 ppm/C 9.2 10.4 14 24 60 65 A mV MAX UNITS V
IR = 100A, 10Hz f 10kHz T = 1000h, IR = 100A
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% 100 ppm/C 65C B grade: 0.85% = 0.2% 100 ppm/C 65C C grade: 1.15% = 0.5% 100 ppm/C 65C D grade: 1.98% = 1.0% 150 ppm/C 65C Note 3: Guaranteed by design.
2
_______________________________________________________________________________________
Improved Precision Micropower Shunt Voltage Reference
Typical Operating Characteristics
(IR = 100A, SC70-3 package, TA = +25C, unless otherwise noted.)
REVERSE CHARACTERISTICS AND MINIMUM OPERATING CURRENT
LM4041-01
LM4041
TEMPERATURE DRIFT
LM4041-02
REVERSE VOLTAGE vs. CURRENT
4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 TA = -40C TA = +25C TA = +85C
LM4041-03
100
0.2 REFERENCE VOLTAGE CHANGE (mV) 0 -0.2 -0.4 -0.6 -0.8 -1.0
4.5 REVERSE VOLTAGE CHANGE (mV)
80 REVERSE CURRENT (A)
60
40
20
0 0 0.4 0.8 1.2 1.6 2.0 REVERSE VOLTAGE (V)
0 -50 0 50 100 0 5 10 15 20 TEMPERATURE (C) REVERSE CURRENT (mA)
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
ISHUNT
VB
+ VR
1k RL
VGEN
Figure 1. Load-Transient Test Circuit
_______________________________________________________________________________________
3
Improved Precision Micropower Shunt Voltage Reference LM4041
Typical Operating Characteristics (continued)
(IR = 100A, SC70-3 package, TA = +25C, unless otherwise noted.)
OUTPUT IMPEDANCE vs. FREQUENCY
LM4041-07 LM4041-08
STARTUP CHARACTERISTICS
5V VIN O RS = 30k SEE FIGURE 2 1000
NOISE vs. FREQUENCY
IR = 200A
LM4041-09
10,000
C1 = 0 100 IMPEDANCE ()
NOISE (nV / Hz) C1 = 1F IR = 1mA
1.5V 1.0V VOUT O.5V 0
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)
RS 30k
VIN 1Hz RATE
VR
Figure 2. Startup Characteristics Test Circuit
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
4
_______________________________________________________________________________________
Improved Precision Micropower Shunt Voltage Reference 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
RS
ISHUNT + ILOAD ILOAD VR
ISHUNT
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 used. Ensure that the resistor's power rating is adequate, using the following general power equation: PR = ISHUNT (VS(MAX) - VR)
LM4041
Figure 3. Typical Operating Circuit
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.
Chip Information
TRANSISTOR COUNT: 60 PROCESS: BiCMOS
_______________________________________________________________________________________
5
Improved Precision Micropower Shunt Voltage Reference LM4041
Package Information
SOTPO3L.EPS
6
_______________________________________________________________________________________
Improved Precision Micropower Shunt Voltage Reference
Package Information (continued)
SC70, 3L.EPS
LM4041
_______________________________________________________________________________________
7
Improved Precision Micropower Shunt Voltage Reference LM4041
NOTES
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.
8 _____________________MAXIM Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2000 MAXIM Integrated Products Printed USA is a registered trademark of MAXIM Integrated Products.

▲Up To Search▲

Price & Availability of MAXIM

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