TSM6025 TOUCHSTONE | Alldatasheet
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Technical content
© 2011 Touchstone Semiconductor, Inc. All rights reserved.
FEATURES
Alternate Source for MAX6025 Initial Accuracy: 0.2% (max) – TSM6025A 0.4% (max) – TSM6025B Temperature Coefficient: 15ppm/°C (max) – TSM6025A 25ppm/°C (max) – TSM6025B Quiescent Supply Current: 35μA (max) Low Supply Current Change with VIN: <1μA/V Output Source/Sink Current: ±500μA Low Dropout at 500μA Load Current: 100mV Load Regulation: 0.14μV/μA Line Regulation : 25μV/V Stable with CLOAD up to 2200pF
APPLICATIONS
Industrial and Process-Control Systems Hard-Disk Drives Battery-Operated Equipment Data Acquisition Systems Hand-Held Equipment Precision 3V/5V Systems Smart Industrial Transmitters
DESCRIPTION
The TSM6025 is a 3-terminal, series-mode 2.5-V precision voltage reference and is a pin-for-pin, alternate source for the MAX6025 voltage reference. Like the MAX6025, the TSM6025 consumes only 27μA of supply current at no-load, exhibits an initial output voltage accuracy of less than 0.2%, and a low output voltage temperature coefficient of 15ppm/°C. In addition, the TSM6025’s output stage is stable for all capacitive loads to 2200pF and is capable of sinking and sourcing load currents up to 500μA. Since the TSM6025 is a series-mode voltage reference, its supply current is not affected by changes in the applied supply voltage unlike two- terminal shunt-mode references that require an external resistor. The TSM6025’s small form factor and low supply current operation combine to make it an ideal choice in low-power, precision applications. The TSM6025 is fully specified over the -40°C to +85°C temperature range and is available in a 3 -pin SOT23 package. A +2.5V, Low-Power/Low-Dropout Precision Voltage Reference TYPICAL APPLICATION CIRCUIT The Touchstone Semiconductor logo is a registered trademark of Touchstone Semiconductor, Incorporated. TEMPERATURE DRIFT- °C OUTPUT VOLTAGE - Volt -40 -15 10 35 85 60 2.4995 2.4985 THREE TYPICAL DEVICES DEVICE #1 DEVICE #2 DEVICE #3 2.5025 2.5015 2.5005 2.5035 Output Voltage Temperature Drift
Continuous Power Dissipation (TA = +70°C) Electrical and thermal 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 condition beyond those indicated in the operational sections of the specifications is not implied. Exposure to any absolute maximum rating conditions for extended periods may affect device reliability and lifetime. PACKAGE/ORDERING INFORMATION ORDER NUMBER PART MARKING CARRIER QUANTITY TSM6025AEUR+ ACX Tape & Reel ----- TSM6025AEUR+T Tape & Reel 3000 TSM6025BEUR+ ACY Tape & Reel ----- TSM6025BEUR+T Tape & Reel 3000 Lead-free Program: Touchstone Semiconductor supplies only lead-free packaging. Consult Touchstone Semiconductor for products specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
VIN = +5V, IOUT = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C. See Note 1. PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS OUTPUT Output Voltage VOUT TA = +25°C TSM6025A 2.495 2.500 2.505 V -0.20 0.20 % TSM6025B 2.490 2.500 2.510 V -0.40 0.40 % Output Voltage Temperature Coefficient (See Note 2) VOUT TA = 0°C to +70°C TSM6025A 6 15 ppm/°C TA = -40°C to +85°C 6 20 TA = 0°C to +70°C TSM6025B 6 25 TA = -40°C to +85°C 6 30 Line Regulation ΔVOUT/ ΔVIN (VOUT + 0.2V) ≤ VIN ≤ 12.6V 140 μV/V Load Regulation ΔVOUT/ ΔIOUT Sourcing: 0 ≤ IOUT ≤ 500μA 0.14 0.60 μV/μA Sinking: -500μA ≤ IOUT ≤ 0 0.18 0.80 Dropout Voltage (See Note 5) VIN -VOUT IOUT = 500μA 100 200 mV OUT Short-Circuit Current ISC VOUT Short to GND 4 mA VOUT Short to IN 4 Temperature Hysteresis (See Note 3) 130 ppm Long-Term Stability ΔVOUT/ time 168hr at TA = +25°C 50 ppm/ 168hr DYNAMIC Noise Voltage eOUT f = 0.1Hz to 10Hz 50 μVP-P f = 10Hz to 10kHz 125 μVRMS Ripple Rejection ΔVOUT/ ΔVIN VIN = 5V ±100mV, f = 120Hz 82 dB Capacitive-Load Stability Range COUT See Note 4 0 2.2 nF INPUT Supply Voltage Range VIN Guaranteed by line-regulation test VOUT + 0.2 12.6 V Quiescent Supply Current IIN 27 35 μA Change in Supply Current IIN/VIN (VOUT + 0.2V) ≤ VIN ≤ 12.6V 2.0 μA/V Note 1: All devices are 100% production tested at TA = +25°C and are guaranteed by characterization for TA = TMIN to TMAX, as specified. Note 2: Temperature Coefficient is measured by the “box” method; i.e., the maximum ΔVOUT is divided by the maximum ΔT. Note 3: Temperature hysteresis is defined as the change in the +25°C output voltage before and after cycling the device from TMIN to TMAX. Note 4: Not production tested; guaranteed by design. Note 5: Dropout voltage is the minimum input voltage at which VOUT changes ≤0.2% from VOUT at VIN = 5.0V.
Line Regulation – ΔVOUT/ΔVIN OUTPUT VOLTAGE CHANGE - µV SUPPLY VOLTAGE - Volt -100 200 300 TA = -40°C TA = +85°C 100 TEMPERATURE DRIFT- °C LOAD CURRENT- µA TA = +85°C Load Regulation – ΔVOUT/ΔILOAD -500 500 250 -250 -0.4 -0.2 0.4 0.2 SOURCE CURRENT- µA DROPOUT VOLTAGE - Volt Dropout Voltage vs Source Current 400 800 0 1000 600 200 0.1 0.4 0.2 0.3 Power Supply Rejection vs Frequency POWER SUPPLY REJECTION – mV/V FREQUENCY - Hz VCC =+5.5V±0.25V 0.01 100 100 1k 10k 1M 100k TIME - Hours OUTPUT VOLTAGE CHANGE - mV TA = +25°C TA = +85°C TA = -40°C 8 12 2 14 10 4 6 TA = -40°C TYPICAL PERFORMANCE CHARACTERISTICS VIN = +5V; IOUT = 0mA; TA = +25°C, unless otherwise noted. TA = +25°C TA = +25°C THREE TYPICAL DEVICES DEVICE #1 0 42 84 168 126 2.498 2.500 2.499 2.502 2.501 OUTPUT VOLTAGE - Volt DEVICE #2 DEVICE #3 Long-Term Output Voltage Drift OUTPUT VOLTAGE - Volt -40 -15 10 35 85 60 2.4995 2.4985 THREE TYPICAL DEVICES DEVICE #1 DEVICE #2 DEVICE #3 2.5025 2.5015 2.5005 2.5035 Output Voltage Temperature Drift 0.1
Supply Current vs Input Voltage 0.1Hz to 10Hz Output Noise VOUT(N) 10µV/DIV OUTPUT IMPEDANCE - Ω FREQUENCY - Hz 0.1 100 10k 0.1 1 100 1M 10k 1s/DIV 200µs/DIV Power-On Transient Response INPUT 2V/DIV 10µs/DIV Small-signal Load Transient Response IOUT 50µA/DIV SUPPLY CURENT - µA INPUT VOLTAGE - Volt 8 12 2 14 Supply Current vs Temperature TEMPERATURE - °C SUPPLY CURENT - µA VCC = +2.5V, +5.5V VCC =+12.5V -40 -15 10 35 85 60 Output Impedance vs Frequency OUTPUT 1V/DIV OUTPUT 20mV/DIV IOUT = 0µA → 50µA → 0µA 46µVpp VCC =+7.5V 4 6 TYPICAL PERFORMANCE CHARACTERISTICS VIN = +5V; IOUT = 0mA; TA = +25°C, unless otherwise noted.
TYPICAL PERFORMANCE CHARACTERISTICS VIN = +5V; IOUT = 0mA; TA = +25°C, unless otherwise noted. 2µs/DIV 10µs/DIV IOUT 1mA/DIV OUTPUT 200mV/DIV VIN =5V±0.25V, AC-Coupled Large-signal Load Transient Response IOUT = 0mA → 1mA → 0mA
1 IN Supply Voltage Input
2 OUT +2.5V Output
3 GND Ground
DESCRIPTION/THEORY OF OPERATION The TSM6025 incorporates a precision 1.25-V bandgap reference that is followed by a output amplifier configured to amplify the base bandgap output voltage to a 2.5-V output. The design of the bandgap reference incorporates proprietary circuit design techniques to achieve its low temperature coefficient of 15ppm/°C and initial output voltage accuracy less than 0.2%. The design of the output amplifier’s frequency compensation does not require a separate compensation capacitor and is stable with capacitive loads up to 2200pF. The design of the output amplifier also incorporates low headroom design as it can source and sink load currents to 500μA with a dropout voltage less than 200mV. APPLICATIONS INFORMATION Power Supply Input Capacitive Bypass As shown in the Typical Application Circuit, the VIN pin of the TSM6025 should be bypassed to GND with a 0.1uF ceramic capacitor for optimal line- transient performance. Consistent with good analog circuit engineering practice, the capacitor should be placed in as close proximity to the TSM6025 as practical with very short pcb track lengths. Output/Load Capacitance Considerations As mentioned previously, the TSM6025 does not require a separate, external capacitor at VOUT for transient response stability as it is stable for capacitive loads up to 2200pF. On the other hand and for improved large-signal line and load regulation, the use of a capacitor at VOUT will provide a reservoir of charge in reserve to absorb large- signal load or line transients. This in turn improves the TSM6025’s VOUT settling time. If large load and line transients are not expected in the application, then the TSM6025 can be used without an external capacitor at VOUT thereby reducing the overall circuit footprint. Supply Current The TSM6025 exhibits excellent dc line regulation as its supply current changes slightly as the applied supply voltage is increased. While its supply current is 35μA maximum, the change in its supply current as a function of supply voltage (its ΔIIN/ΔVIN) is less than 1μA/V. Since the TSM6025 is a series-mode reference, load current is drawn from the supply voltage only when required. In this case, circuit efficiency is maintained at all applied supply voltages. Reducing power dissipation and extending battery life are the net benefits of improved circuit efficiency. On the other hand, an external resistor in series with the supply voltage is required by two-terminal, shunt-mode references. In this case, as the supply voltage changes, so does the quiescent supply current of the shunt reference. In addition, the external resistor’s tolerance and temperature coefficient contribute two additional factors that can affect the circuit’s supply current. Therefore, maximizing circuit efficiency with shunt-mode references becomes an exercise involving three variables. Additionally, shunt-mode references must be biased at the maximum expected load current even if the load current is not present at all times. When the applied supply voltage is less than the minimum specified input voltage of the TSM6025 (for example, during the power-up transition), the TSM6025 can draw up to 200μA above its nominal, steady-state supply current. To ensure reliable power-up behavior, the input power source must have sufficient reserve power to provide the extra supply current drawn during the power-up transition.
Reference output voltage thermal hysteresis is the change in the reference’s +25°C output voltage after temperature cycling from +85°C to +25°C and from - 40°C to +25°C. Thermal hysteresis is caused by differential package stress impressed upon the TSM6025’s internal bandgap core transistors and depends on whether the reference IC was previously at a higher or lower temperature. At 130ppm, the TSM6025’s typical temperature hysteresis is equal to 0.33mV with respect to a 2.5V output voltage. Voltage Reference Turn-On Time With a (VIN – VOUT) voltage differential larger than 200mV and ILOAD = 0mA, the TSM6025’s typical combined turn-on and settling time to within 0.1% of its 2.5V final value is approximately 340μs. A Positive and Negative Low-Power Voltage Reference The circuit in Figure 1 uses a CD4049 hex inverter and a few external capacitors as the power supply to a dual-supply precision op amp to form a ±2.5V precision, bipolar output voltage reference around the TSM6025. The CD4049-based circuit is a discrete charge pump voltage doubler/inverter that generates ±6V supplies for any industry-standard OP-07 or equivalent precision op amp. Figure 1: Positive and Negative 2.5V References from a Single +3V or +5V Supply
Touchstone Semiconductor, Inc. Page 9
630 Alder Drive, Milpitas, CA 95035 TSM6025DS r1p0
+1 (408) 215 - 1220 ▪ www.touchstonesemi.com RTFDS PACKAGE OUTLINE DRAWING 3-Pin SOT23 Package Outline Drawing (N.B., Drawings are not to scale)
1.03 Max
0.89Min
3.04 Max
2.80 Min
1.12 Max
0.89 Min
0.100 Max
0.013 Min
0.3Min 0.5Max
2.64 Max
2.10 Min
0.94 Max
0.88 Min
0.54 Max
0.48 Min
1.40 Max
1.20 Min
0.20 Max
0.08Min
0.685 Max
0.406 Min
0.25
0.41 Max
0.21 Min
0' – 8' Does not include mode flash, protrusions or gate burns. Mode flash, protrusions or gate burns shall not exceed 0.127 mm per side Does not include inter-lead flash or protrusions. Inter-lead flash and protrusions shall not exceed 0.127 mm per side. 3. Die is facing up for mold die and trim-form. 4. Lead span/stand of high/coplanarity are considered as special characteristic. 5. All specifications referd JEDEC TO-236AB except for lead length dimension. 6. Controlling dimension in (mm)
0.10 Max
NOTE:
0.16 Max
0.08 Min
0.50 Max
0.30 Min
0.45 Max
10' TYP 10' TYP GAUGE PLANE
2.05 Max
1.78 Min
0.27 REF
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