High-Precision Voltage References with Temperature Sensor

Transcription

1 General Description The MAX6173 MAX6177 are low-noise, high-precision voltage references. The devices feature a proprietary temperature-coefficient curvature-correction circuit and laser-trimmed thin-film resistors that result in a very low 3ppm/ C temperature coefficient and excellent ±.6% initial accuracy. The MAX6173 MAX6177 provide a TEMP output where the output voltage is proportional to the die temperature, making the devices suitable for a wide variety of temperature-sensing applications. The devices also provide a TRIM input, allowing fine trimming of the output voltage with a resistive divider network. Low temperature drift and low noise make the devices ideal for use with high-resolution A/D or D/A converters. The MAX6173 MAX6177 provide accurate preset +2.5V, +3.3V, +4.96V, +5.V, and +1V reference voltages and accept input voltages up to +4V. The devices draw 32μA (typ) of supply current and source 3mA or sink 2mA of load current. The MAX6173 MAX6177 use bandgap technology for low-noise performance and excellent accuracy. The MAX6173 MAX6177 do not require an output bypass capacitor for stability, and are stable with capacitive loads up to 1μF. Eliminating the output bypass capacitor saves valuable board area in spacecritical applications. The MAX6173 MAX6177 are available in an 8-pin SO package and operate over the automotive (-4 C to +125 C) temperature range. Applications ADCs DACs Digital Voltmeters Voltage Regulators Threshold Detectors Benefits and Features Wide ( + 2V) to +4V Supply Voltage Range Excellent Temperature Stability: 3ppm/ C (max) Tight Initial Accuracy:.5% (max) Low Noise: 3.8μV P-P (typ at 2.5V Output) Sources up to 3mA Output Current Low Supply Current: 45μA (max at +25 C) Linear Temperature Transducer Voltage Output +2.5V, +3.3V, +4.96V, +5.V, or +1V Output Voltages Wide Operating Temperature Range: -4 C to +125 C No External Capacitors Required for Stability Short-Circuit Protected AEC-Q1 Qualified (MAX6174BASA/V+ and MAX6175BASA/V+ Only) Typical Operating Circuit *OPTIONAL. ( + 2V) TO 4PUT IN OUT * MAX6173 MAX6177 * TEMP TRIM * REFERENCE OUTPUT Pin Configuration and Ordering Information appears at end of data sheet ; Rev 9; 3/18

2 Absolute Maximum Ratings IN to...-.3v to +42V OUT, TRIM, TEMP to...-.3v to ( +.3V) Output Short-Circuit to... 5s Continuous Power Dissipation (T A = +7 C) (Note1) 8-Pin SO (derate 7.6mW/ C above +7 C)...66mW Operating Temperature Range C to +125 C Junction Temperature C Storage Temperature Range C to +15 C Lead Temperature (soldering, 1s)...+3 C Soldering Temperature (reflow) 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. Package Thermal Characteristics (Note 1) 8-SO Junction-to-Ambient Thermal Resistance (qja) C/W Junction-to-Case Thermal Resistance (qjc)...38 C/W Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations,refer to Electrical Characteristics MAX6173 ( = 2.5V) ( = +5V, T A = -4 C to +125 C, unless otherwise noted. Typical values are at.) (Note 2) OUTPUT PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Output Voltage No load, MAX6173A (.6%) V MAX6173B (.1%) Output Adjustment Range V TRIM R POT = 1kΩ ±3 ±6 % Output-Voltage Temperature Coefficient (Note 3) TC T A = -4 C to +125 C Line Regulation (Note 4) D /D 4.5V 4V Load Regulation (Note 4) Output Short-Circuit Current Temperature Hysteresis (Note 5) Long-Term Stability DYNAMIC D /D Sourcing: 1mA Sinking: -.6mA MAX6173AASA MAX6173BASA T A = -4 C to +125 C T A = -4 C to +125 C T A = -4 C to +125 C 9 9 OUT shorted to 6 I SC OUT shorted to IN 3 D / cycle D / time ppm/ C ppm/v ppm/ma ma 12 ppm 1 hours at 5 ppm Noise Voltage e OUT f =.1Hz to 1Hz 3.8 µv P-P f = 1Hz to 1kHz 6.8 µv RMS Turn-On Settling Time t R To =.1% of final value, C OUT = 5pF 15 µs INPUT Supply Voltage Range Guaranteed by line regulation test V Quiescent Supply Current I IN No load 3 45 T A = -4 C to +125 C 6 µa Maxim Integrated 2

3 Electrical Characteristics MAX6173 ( = 2.5V) (continued) ( = +5V, T A = -4 C to +125 C, unless otherwise noted. Typical values are at.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS TEMP OUTPUT TEMP Output Voltage V TEMP 57 mv TEMP Temperature Coefficient TC TEMP 1.9 mv/ C Electrical Characteristics MAX6177 ( = 3.3V) ( = +1V, T A = -4 C to +125 C, unless otherwise noted. Typical values are at.) (Note 2) OUTPUT PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Output Voltage No load, MAX6177A (.6%) V MAX6177B (.1%) Output Adjustment Range V TRIM R POT = 1kΩ ±3 ±6 % Output-Voltage Temperature Coefficient (Note 3) TC T A = -4 C to +125 C Line Regulation (Note 4) D /D 5.3V 4V Load Regulation (Note 4) Output Short-Circuit Current Temperature Hysteresis (Note 5) Long-Term Stability DYNAMIC D /D Sourcing: 1mA Sinking: -.6mA MAX6177AASA MAX6177BASA T A = -4 C to +125 C T A = -4 C to +125 C T A = -4 C to +125 C 9 9 OUT shorted to 6 I SC OUT shorted to IN 3 D / cycle D / time ppm/ C ppm/v ppm/ma ma 12 ppm 1 hours at 5 ppm Noise Voltage e OUT f =.1Hz to 1Hz 5 µv P-P f = 1Hz to 1kHz 9.3 µv RMS Turn-On Settling Time t R To =.1% of final value, C OUT = 5pF 18 µs INPUT Supply Voltage Range Guaranteed by line regulation test V Quiescent Supply Current I IN No load TEMP OUTPUT 32 5 T A = -4 C to +125 C 65 TEMP Output Voltage V TEMP 63 mv TEMP Temperature Coefficient TC TEMP 2.1 mv/ C µa Maxim Integrated 3

4 Electrical Characteristics MAX6174 ( = 4.96V) ( = +1V, T A = -4 C to +125 C, unless otherwise noted. Typical values are at.) (Note 2) OUTPUT PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Output Voltage No load, MAX6174A (.6%) MAX6174B (.1%) Output Adjustment Range DV TRIM R POT = 1kΩ ±3 ±6 % Output-Voltage Temperature Coefficient (Note 3) Line Regulation (Note 4) Load Regulation (Note 4) TC T A = -4 C to +125 C MAX6174AASA ppm/ C MAX6174BASA 3 1 D / D D / D 6.1V 4V Sourcing: 1mA Sinking: -.6mA.6 5 T A = -4 C to +125 C T A = -4 C to +125 C T A = -4 C to +125 C 9 9 OUT shorted to 6 Output Short-Circuit Current I SC OUT shorted to IN 3 Temperature Hysteresis (Note 5) Long-Term Stability DYNAMIC D / cycle D / time V ppm/v ppm/ma ma 12 ppm 1 hours at 5 ppm Noise Voltage e OUT f =.1Hz to 1Hz 7 µv P-P f = 1Hz to 1kHz 11.5 µv RMS Turn-On Settling Time t R To =.1% of final value, C OUT = 5pF 2 µs INPUT Supply Voltage Range Guaranteed by line regulation test V Quiescent Supply Current I IN No load TEMP OUTPUT 32 5 T A = -4 C to +125 C TEMP Output Voltage V TEMP T A = -4 C to +125 C TEMP Temperature Coefficient TC TEMP 2.1 mv/ C µa mv Maxim Integrated 4

5 Electrical Characteristics MAX6175 ( = 5.V) ( = +15V, T A = -4 C to +125 C, unless otherwise noted. Typical values are at.) (Note 2) OUTPUT PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Output Voltage No load, MAX6175A (.6%) MAX6175B (.1%) Output Adjustment Range DV TRIM R POT = 1kΩ ±3 ±6 % Output-Voltage Temperature Coefficient (Note 3) Line Regulation (Note 4) Load Regulation (Note 4) TC D / D D / D T A = -4 C to +125 C 7V 4V Sourcing: 1mA Sinking: -.6mA MAX6175AASA MAX6175BASA T A = -4 C to +125 C T A = -4 C to +125 C T A = -4 C to +125 C 9 9 OUT shorted to 6 Output Short-Circuit Current I SC OUT shorted to IN 3 Temperature Hysteresis (Note 5) Long-Term Stability DYNAMIC D / cycle D / time V ppm/ C ppm/v ppm/ma ma 12 ppm 1 hours at 5 ppm Noise Voltage e OUT f =.1Hz to 1Hz 9 µv P-P f = 1Hz to 1kHz 14.5 µv RMS Turn-On Settling Time t R To =.1% of final value, C OUT = 5pF 23 µs INPUT Supply Voltage Range Guaranteed by line regulation test V Quiescent Supply Current I IN No load TEMP OUTPUT T A = -4 C to +125 C TEMP Output Voltage V TEMP T A = -4 C to +125 C TEMP Temperature Coefficient TC TEMP 2.1 mv/ C µa mv Maxim Integrated 5

6 ELECTRICAL CHARACTERISTICS MAX6176 ( = 1V) ( = +15V, T A = -4 C to +125 C, unless otherwise noted. Typical values are at.) (Note 2) OUTPUT PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Output Voltage No load, MAX6176A (.5%) MAX6176B (.1%) Output Adjustment Range DV TRIM R POT = 1kΩ ±3 ±6 % Output-Voltage Temperature Coefficient (Note 3) Line Regulation (Note 4) Load Regulation (Note 4) Output Short-Circuit Current Temperature Hysteresis (Note 5) Long-Term Stability DYNAMIC TC D / D D / D T A = -4 C to +125 C 12V 4V Sourcing: 1mA Sinking: -.6mA MAX6176AASA MAX6176BASA T A = -4 C to +125 C T A = -4 C to +125 C T A = -4 C to +125 C 9 9 OUT shorted to 6 I SC OUT shorted to IN 3 D / cycle D / time Note 2: All devices are 1% production tested at and guaranteed by design over T A = T MIN to T MAX, as specified. Note 3: Temperature coefficient is defined as divided by the temperature range. Note 4: Line and load regulation specifications do not include the effects of self-heating. Note 5: Thermal hysteresis is defined as the change in +25 C output voltage before and after cycling the device from T MAX to T MIN. V ppm/ C ppm/v ppm/ma ma 12 ppm 1 hours at 5 ppm Noise Voltage e OUT f =.1Hz to 1Hz 18 µv P-P f = 1Hz to 1kHz 29 µv RMS Turn-On Settling Time t R To =.1% of final value, C OUT = 5pF 4 µs INPUT Supply Voltage Range Guaranteed by line regulation test V Quiescent Supply Current I IN No load TEMP OUTPUT T A = -4 C to +125 C 7 TEMP Output Voltage V TEMP 63 mv TEMP Temperature Coefficient TC TEMP 2.1 mv/ C µa Maxim Integrated 6

7 Typical Operating Characteristics ( = +5V for = +2.5V, = +15V for = 4.96V and = +1V, =,, unless otherwise noted.) OUTPUT VOLTAGE (V) OUTPUT VOLTAGE CHANGE (mv) OUTPUT VOLTAGE vs. TEMPERATURE ( = 2.5V) THREE TYPICAL PARTS TEMPERATURE ( C) LOAD REGULATION vs. SOURCE CURRENT ( = 2.5V) T A = -4 C MAX6173 toc1 MAX6173 toc3 OUTPUT VOLTAGE (V) OUTPUT VOLTAGE CHANGE (mv) OUTPUT VOLTAGE vs. TEMPERATURE ( = 4.96V) toc1b C LOAD = NO LOAD TEMPERATURE ( C) LOAD REGULATION vs. SOURCE CURRENT ( = 4.96V) C OUT = toc3b OUTPUT VOLTAGE (V) OUTPUT VOLTAGE CHANGE (mv) OUTPUT VOLTAGE vs. TEMPERATURE ( = 1V) THREE TYPICAL PARTS TEMPERATURE ( C) LOAD REGULATION vs. SOURCE CURRENT ( = 1V) T A = -4 C MAX6173 toc2 MAX6173 toc SOURCE CURRENT (ma) SOURCE CURRENT (ma) SOURCE CURRENT (ma) OUTPUT VOLTAGE CHANGE (mv) LOAD REGULATION vs. SINK CURRENT ( = 2.5V) T A = -4 C SINK CURRENT (ma) MAX6173 toc5 OUTPUT VOLTAGE CHANGE (mv) LOAD REGULATION vs. SINK CURRENT ( = 4.96V) toc5b C LOAD = NO LOAD SINK CURRENT (ma) OUTPUT VOLTAGE CHANGE (mv) LOAD REGULATION vs. SINK CURRENT ( = 1V) T A = -4 C SINK CURRENT (ma) MAX6173 toc6 Maxim Integrated 7

8 Typical Operating Characteristics (continued) ( = +5V for = +2.5V, = +15V for = 4.96V and = +1V, =,, unless otherwise noted.) OUTPUT VOLTAGE CHANGE (µv) LINE REGULATION vs. TEMPERATURE ( = 2.5V) T A = -4 C INPUT VOLTAGE (V) MAX6173 toc7 OUTPUT VOLTAGE VARIATION ( V) LINE REGULATION vs. TEMPERATURE ( = 4.96V) T A = -1 C C LOAD = NO LOAD T A = -4 C T A = +65 C T A = +1 C toc7b INPUT VOLTAGE (V) OUTPUT VOLTAGE CHANGE (µv) LINE REGULATION vs. TEMPERATURE ( = 1V) T A = -4 C INPUT VOLTAGE (V) MAX6173 toc8 DROPOUT VOLTAGE (V) MINIMUM INPUT-OUTPUT DIFFERENTIAL vs. SOURCE CURRENT ( = 2.5V) T A = -4 C MAX6173 toc9 DROPOUT VOLTAGE (V) MINIMUM INPUT-OUTPUT DIFFERENTIAL vs. SOURCING CURRENT ( = 4.96V) T A = -4 C toc9a DROPOUT VOLTAGE (V) MINIMUM INPUT-OUTPUT DIFFERENTIAL vs. SOURCE CURRENT ( = 1V) T A = -4 C MAX6173 toc SOURCE CURRENT (ma) SOURCE CURRENT (ma) SOURCE CURRENT (ma) PSRR (db) POWER-SUPPLY REJECTION RATIO vs. FREQUENCY ( = 2.5V) FREQUENCY (khz) MAX6173 toc11 PSRR (db) POWER-SUPPLY REJECTION RATIO vs. FREQUENCY ( = 1V) FREQUENCY (khz) MAX6173 toc12 PSRR (db) PSRR vs. FREQUENCY toc12a -1 = 4.96V FREQUENCY (khz) Maxim Integrated 8

9 Typical Operating Characteristics (continued) ( = +5V for = +2.5V, = +15V for = 4.96V and = +1V, =,, unless otherwise noted.) OUTPUT IMPEDANCE (Ω) OUTPUT IMPEDANCE vs. FREQUENCY ( = 2.5V) MAX6173 toc13 OUTPUT IMPEDANCE (Ω) OUTPUT IMPEDANCE vs. FREQUENCY ( = 4.96V) toc13b C OUT = OUTPUT IMPEDANCE (Ω) OUTPUT IMPEDANCE vs. FREQUENCY ( = 4.96V) toc13c C OUT = 1µF SUPPLY CURRENT (µa) FREQUENCY (khz) SUPPLY CURRENT vs. INPUT VOLTAGE ( = 2.5V) T A = -4 C MAX6173 toc14 SUPPLY CURRENT ( A) FREQUENCY (khz) SUPPLY CURRENT vs. INPUT VOLTAGE ( = 4.96) toc14b SUPPLY CURRENT (µa) FREQUENCY (khz) SUPPLY CURRENT vs. INPUT VOLTAGE ( = 1V) T A = -4 C MAX6173 toc INPUT VOLTAGE (V) 5 C OUT = INPUT VOLTAGE (V) INPUT VOLTAGE (V) SUPPLY CURRENT (µa) SUPPLY CURRENT vs. TEMPERATURE ( = 2.5V) MAX6173 toc16 SUPPLY CURRENT (μa) SUPPLY CURRENT vs. TEMPERATURE ( = 4.96V) toc16b C OUT = SUPPLY CURRENT (µa) SUPPLY CURRENT vs. TEMPERATURE ( = 1V) MAX6173 toc TEMPERATURE ( C) TEMPERATURE ( C) TEMPERATURE ( C) Maxim Integrated 9

10 Typical Operating Characteristics (continued) ( = +5V for = +2.5V, = +15V for = 4.96V and = +1V, =,, unless otherwise noted.) TEMP VOLTAGE (mv) TEMP VOLTAGE vs. TEMPERATURE ( = 2.5V) MAX6173 toc18 TEMP VOLTAGE (mv) TEMP VOLTAGE vs. TEMPERATURE ( = 4.96V) toc18b C OUT = TEMP VOLTAGE (mv) TEMP VOLTAGE vs. TEMPERATURE ( = 1V) MAX6173 toc TEMPERATURE ( C) TEMPERATURE ( C) TEMPERATURE ( C) OUTPUT VOLTAGE (V) OUTPUT VOLTAGE vs. TRIM VOLTAGE ( = 2.5V) TRIM VOLTAGE (V) MAX6173 toc2 OUTPUT VOLTAGE CHANGE (V) OUTPUT VOLTAGE vs. TRIM VOLTAGE ( = 4.96V) toc2b TRIM VOLTAGE (V) VOUT (V) LONG-TERM STABILITY vs. TIME ( = 2.5V) TWO TYPICAL PARTS TIME (hours) MAX6173 toc21 VOUT (V) LONG-TERM STABILITY vs. TIME ( = 4.96V) TWO TYPICAL PARTS TIME (hours) toc21b C OUT = VOUT (V) LONG-TERM STABILITY vs. TIME ( = 1.V) TWO TYPICAL PARTS TIME (hours) MAX6173 toc22 OUTPUT VOLTAGE-NOISE DENSITY (nv/ Hz) 1 1 OUTPUT-VOLTAGE NOISE DENSITY vs. FREQUENCY ( = 2.5V) FREQUENCY (Hz) MAX6173 toc23 Maxim Integrated 1

11 Typical Operating Characteristics (continued) ( = +5V for = +2.5V, = +15V for = 4.96V and = +1V, =,, unless otherwise noted.) INPUT VOLTAGE-NOISE DENSITY (nv/ Hz) 1 1 OUTPUT VOLTAGE-NOISE DENSITY vs. FREQUENCY ( = 4.96V) toc23b C OUT = INPUT VOLTAGE-NOISE DENSITY (nv/ Hz) OUTPUT VOLTAGE-NOISE DENSITY vs. FREQUENCY ( = 4.96V) toc23c C OUT = 1µF OUTPUT VOLTAGE-NOISE DENSITY (nv/ Hz) 1, 1 1 OUTPUT-VOLTAGE NOISE DENSITY vs. FREQUENCY ( = 1V) MAX6173 toc24 FREQUENCY (Hz) FREQUENCY (Hz) FREQUENCY (Hz) 6.1Hz to 1Hz OUTPUT VOLTAGE NOISE ( = 4.96V, C OUT = ) toc24b 6.1Hz to 1Hz OUTPUT VOLTAGE NOISE ( = 4.96V, C OUT = 1µF) toc24c OUTPUT VOLTAGE NOISE (μvp-p) OUTPUT VOLTAGE NOISE (μvp-p) s/div -6 4s/div.1Hz TO 1Hz OUTPUT NOISE ( = 2.5V) MAX6173 toc25.1hz TO 1Hz OUTPUT NOISE ( = 1V) MAX6173 toc26 1µV/div 4µV/div 1s/div 1s/div Maxim Integrated 11

12 Typical Operating Characteristics (continued) ( = +5V for = +2.5V, = +15V for = 4.96V and = +1V, =,, unless otherwise noted.) ( = 2.5V, C OUT =, TO 2mA) MAX6173 toc27 2mA ( = 2.5V, C OUT = 1µF, TO +2mA) MAX6173 toc28 2mA 1V/div 5mV/div 1µs/div 2µs/div ( = 4.96V, C OUT =, TO 2mA) toc28b ( = 4.96V, C OUT = 1μF, TO 2mA) toc28c 2mA 2mA 1mA/div 1mA/div AC- COUPLED 1V/div AC- COUPLED 1mV/div 1μs/div 1μs/div ( = 1V, C OUT =, TO 2mA) MAX6173 toc29 2mA ( = 1V, C OUT = 1µF, TO 2mA) MAX6173 toc3 2mA 1V/div 1mV/div 1µs/div 1µs/div Maxim Integrated 12

13 Typical Operating Characteristics (continued) ( = +5V for = +2.5V, = +15V for = 4.96V and = +1V, =,, unless otherwise noted.) ( = 2.5V, C OUT =, TO -2mA) MAX6173 toc31-2ma ( = 4.96V, C OUT =, I SINK = TO -2mA) toc31b I SINK -2mA 2mV/div 4µs/div 1μs/div ( = 1V, C OUT =, TO -2mA) MAX6173 toc32-2ma ( = 2.5V, C OUT = 1µF, TO -2mA) MAX6173 toc33-2ma 2mV/div 2mV/div 2µs/div 4µs/div ( = 4.96V, C OUT = 1μF, I SINK = TO -2mA) toc33b ( = 1V, C OUT = 1µF, TO -2mA) MAX6173 toc34 I SINK -2mA -2mA AC- COUPLED 2mV/div AC- COUPLED 5mV/div 5mV/div 1μs/div 4µs/div Maxim Integrated 13

14 Typical Operating Characteristics (continued) ( = +5V for = +2.5V, = +15V for = 4.96V and = +1V, =,, unless otherwise noted.) LINE TRANSIENT ( = 4.96V, COUT = ) toc34b LINE TRANSIENT ( = 4.96V, COUT = 1µF toc34c.5v/div AC- COUPLED (14.5V TO 15.5V).5V/div AC- COUPLED (14.5V TO 15.5V) AC- COUPLED 5mV/div AC- COUPLED 2mV/div 1μs/div 2μs/div LINE TRANSIENT ( = 2.5V) MAX6173 toc35 5.5V 4.5V LINE TRANSIENT ( = 1V) MAX6173 toc V 1V/div 14.5V 2mV/div 2mV/div C OUT = 1µs/div 2µs/div TURN-ON TRANSIENT ( = 2.5V, C OUT = ) MAX6173 toc37 TURN-ON TRANSIENT ( = 2.5V, C OUT = 1µF) MAX6173 toc38 2V/div 2V/div 1V/div 1V/div 1µs/div 4µs/div Maxim Integrated 14

15 Typical Operating Characteristics (continued) ( = +5V for = +2.5V, = +15V for = 4.96V and = +1V, =,, unless otherwise noted.) TURN-ON TRANSIENT ( = 4.96V, COUT = ) toc38b TURN-ON TRANSIENT ( = 4.96V, COUT = 1µF) toc38c 1V/div 1V/div 2V/div P 2V/div 2μs/div 1µs/div TURN-ON TRANSIENT ( = 1V, C OUT = ) MAX6173 toc39 TURN-ON TRANSIENT ( = 1V, C OUT = 1µF) MAX6173 toc4 5V/div 5V/div 5V/div 5V/div 1µs/div 2µs/div Maxim Integrated 15

16 Pin Description PIN NAME FUNCTION 1, 8 I.C. Internally Connected. Do not connect externally. 2 IN Positive Power-Supply Input 3 TEMP 4 Ground 5 TRIM 6 OUT Output Voltage Temperature Proportional Output Voltage. TEMP generates an output voltage proportional to the die temperature. Output Voltage Trim. Connect TRIM to the center of a voltage-divider between OUT and for trimming. Leave unconnected to use the preset output voltage. 7 N.C. No Connection. Not internally connected. Detailed Description The MAX6173 MAX6177 precision voltage references provide accurate preset +2.5V, +3.3V, +4.96V, +5.V, and +1V reference voltages from up to +4V input voltages. These devices feature a proprietary temperaturecoefficient curvature-correction circuit and laser-trimmed thin-film resistors that result in a very low 3ppm/ C temperature coefficient and excellent.5% initial accuracy. The MAX6173 MAX6177 draw 34μA of supply current and source 3mA or sink 2mA of load current. Trimming the Output Voltage Trim the factory-preset output voltage on the MAX6173 MAX6177 by placing a resistive divider network between OUT, TRIM, and. Use the following formula to calculate the change in output voltage from its preset value: where: = 2 x (V TRIM - V TRIM (open) ) x k V TRIM = V to V TRIM (open) = (nominal)/2 (typ) k = ±6% (typ) For example, use a 5kΩ potentiometer (such as the MAX5436) between OUT, TRIM, and with the potentiometer wiper connected to TRIM (see Figure 2). As the TRIM voltage changes from to, the output voltage changes accordingly. Set R2 to 1MΩ or less. Currents through resistors R1 and R2 add to the quiescent supply current. Temp Output The MAX6173 MAX6177 provide a temperature output proportional to die temperature. TEMP can be calculated from the following formula: TEMP (V) = T J ( K) x n where T J = the die temperature, n = the temperature multiplier, V TEMP(at TJ = T ) n = 1.9mV / K T T A = the ambient temperature. Self-heating affects the die temperature and conversely, the TEMP output. The TEMP equation assumes the output is not loaded. If device power dissipation is negligible, then T J T A. Maxim Integrated 16

17 Applications Information Bypassing/Output Capacitance For the best line-transient performance, decouple the input with a.1μf ceramic capacitor as shown in the Typical Operating Circuit. Place the capacitor as close to IN as possible. When transient performance is less important, no capacitor is necessary. The MAX6173 MAX6177 do not require an output capacitor for stability and are stable with capacitive loads up to 1μF. In applications where the load or the supply can experience step changes, a larger output capacitor reduces the amount of overshoot (undershoot) and improves the circuit s transient response. Place output capacitors as close to the devices as possible for best performance. Supply Current The MAX6173 MAX6177 consume 32μA (typ) of quiescent supply current. This improved efficiency reduces power dissipation and extends battery life. Thermal Hysteresis Thermal hysteresis is the change in the output voltage at before and after the device is cycled over its entire operating temperature range. Hysteresis is caused by differential package stress appearing across the bandgap core transistors. The typical thermal hysteresis value is 12ppm. Turn-On Time The MAX6173 MAX6177 typically turn on and settle to within.1% of the preset output voltage in 15μs (2.5V output). The turn-on time can increase up to 15μs with the device operating with a 1μF load. Short-Circuited Outputs The MAX6173 MAX6177 feature a short-circuit-protected output. Internal circuitry limits the output current to 6mA when short circuiting the output to ground. The output current is limited to 3mA when short circuiting the output to the input. Temperature Coefficient vs. Operating Temperature Range for a 1 LSB Maximum Error In a data converter application, the reference voltage of the converter must stay within a certain limit to keep the error in the data converter smaller than the resolution limit through the operating temperature range. Figure 1 shows the maximum allowable reference-voltage temperature coefficient to keep the conversion error to less than 1 LSB, as a function of the operating temperature range (T MAX - T MIN ) with the converter resolution as a parameter. The graph assumes the reference-voltage temperature coefficient as the only parameter affecting accuracy. In reality, the absolute static accuracy of a data converter is dependent on the combination of many parameters such as integral nonlinearity, differential nonlinearity, offset error, gain error, as well as voltage-reference changes. 1, 1 TEMPERATURE COEFFICIENT (ppm/ C) 1 8-BIT 1 1-BIT 12-BIT 1 14-BIT.1 16-BIT 18-BIT.1 2-BIT OPERATING TEMPERATURE RANGE (T MAX - T MIN ) ( C) Figure 1. Temperature Coefficient vs. Operating Temperature Range for a 1 LSB Maximum Error Maxim Integrated 17

18 Pin Configuration ( + 2V) TO 4PUT TOP VIEW I.C.* I.C.* * IN OUT MAX6173 MAX6177 REFERENCE OUTPUT IN TEMP MAX6173 MAX6177 SO N.C. OUT TRIM TEMP TRIM MAX5436 5kΩ POTENTIOMETER *INTERNALLY CONNECTED. DO NOT CONNECT. *OPTIONAL. Chip Information PROCESS: BiCMOS Figure 2. Applications Circuit Using the MAX5436 Potentiometer Package Information For the latest package outline information and land patterns (footprints), go to 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 PACKAGE CODE OUTLINE NO. LAND PATTERN NO. 8 SO S Ordering Information/Selector Guide PART TEMP RANGE PIN- PACKAGE OUTPUT VOLTAGE (V) TEMPERATURE COEFFICIENT (ppm/ C) -4 C TO +125 C INITIAL ACCURACY (%) MAX6173AASA+ -4 C to +125 C 8 SO MAX6173BASA+ -4 C to +125 C 8 SO MAX6174AASA+ -4 C to +125 C 8 SO MAX6174BASA+ -4 C to +125 C 8 SO MAX6174BASA/V+ -4 C to +125 C 8 SO MAX6174BASA/V+T -4 C to +125 C 8 SO MAX6175AASA+ -4 C to +125 C 8 SO MAX6175BASA+ -4 C to +125 C 8 SO MAX6175BASA/V+ -4 C to +125 C 8 SO MAX6176AASA+ -4 C to +125 C 8 SO MAX6176BASA+ -4 C to +125 C 8 SO MAX6177AASA+ -4 C to +125 C 8 SO MAX6177BASA+ -4 C to +125 C 8 SO Denotes a lead(pb)-free/rohs-compliant package. /V denotes an automotive qualified part Maxim Integrated 18

19 Revision History REVISION NUMBER REVISION DATE DESCRIPTION PAGES CHANGED 6/4 Initial release 1 2/11 Added automotive grade part, lead-free information, and soldering temperature 2 3/14 Updated package code in Package Information /14 Updated Ordering Information, Electrical Characteristics, and Typical Operating Characteristics 1, 2 1, 4, 5, 8 4 9/14 Updated Typical Operating Characteristics /14 Updated Typical Operating Characteristics /17 Added AEC statement to Benefits and Features section 1 7 3/18 Updated Ordering Information table /18 Updated Absolute Maximum Ratings section and Electrical Characteristics table /18 Updated Absolute Maximum Ratings section 2 For pricing, delivery, and ordering information, please contact Maxim Direct at , or visit Maxim Integrated s website at Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. 218 Maxim Integrated Products, Inc. 19