19-165; Rev ; 7/ Precision, Micropower, Low-Dropout, High- General Description The MAX6167 are precision, low-dropout, micropower voltage references. These three-terminal devices operate with an input voltage range from (VOUT + 2mV) to 12.6V and are available with output voltage options of 1.25V, 2.48V, 2.5V, 3V, 4.96V, 4.5V, and 5V. They feature a proprietary curvature-correction circuit and laser-trimmed thin-film resistors that result in a very low temperature coefficient of 5ppm/ C (max) and an initial accuracy of ±2mV (max). Specifications apply to the extended temperature range (-4 C to +85 C). The MAX6167 typically draw only 9µA of supply current and can source 5mA (4mA for ) or sink 2mA of load current. Unlike conventional shunt-mode (two-terminal) references that waste supply current and require an external resistor, these devices offer a supply current that is virtually independent of the supply voltage (8µA/V variation) and do not require an external resistor. Additionally, the internally compensated devices do not require an external compensation capacitor and are stable with up to 1µF of load capacitance. Eliminating the external compensation capacitor saves valuable board area in space-critical applications. Low dropout voltage and supply independent, ultra-low supply current make these devices ideal for battery-operated, high-performance, low-voltage systems. The MAX6167 are available in 8-pin SO packages. Applications Analog-to-Digital Converters (ADCs) Portable Battery-Powered Systems Notebook Computers PDAs, GPS, DMMs Cellular Phones Precision 3V/5V Systems Features ±2mV max Initial Accuracy 5ppm/ C max Temperature Coefficient 5mA Source Current at.9mv/ma 2mA Sink Current at 2.5mV/mA Stable with CLOAD = to 1µF 9µA typ Quiescent Supply Current 2mV max Dropout at 1mA Load Current 6µV/V Line Regulation Output Voltage Options: 1.25V, 2.48V, 2.5V, 3V, 4.96V, 4.5V, 5V PART* TOP VIEW Ordering Information TEMP. RANGE PIN- PACKAGE OUTPUT VOLTAGE (V) _ESA -4 C to +85 C 8 SO 1.25 MAX6162_ESA -4 C to +85 C 8 SO 2.48 MAX6163_ESA -4 C to +85 C 8 SO 3. MAX6164_ESA -4 C to +85 C 8 SO 4.96 _ESA -4 C to +85 C 8 SO 5. MAX6166_ESA -4 C to +85 C 8 SO 2.5 MAX6167_ESA -4 C to +85 C 8 SO 4.5 *Insert the code for the desired initial accuracy and temperature coefficient (from the Selector Guide) in the blank to complete the part number. Pin Configuration MAX6167 N.C. 1 8 N.C. IN N.C. 2 3 MAX6167 7 6 N.C. OUT GND 4 5 N.C. Typical Operating Circuit and Selector Guide appear at end of data sheet. SO Maxim Integrated Products 1 For free samples and the latest literature, visit www.maxim-ic.com or phone 1-8-998-88. For small orders, phone 1-8-835-8769.
MAX6167 ABSOLUTE MAXIMUM RATINGS Voltages Referenced to GND IN...-.3 to +13.5V OUT...-.3V to (V IN +.3V) Output Short-Circuit Duration to GND or IN (V IN 6V)...Continuous Output Short-Circuit Duration to GND or IN (V IN > 6V)...6s Continuous Power Dissipation (T A = +7 C) 8-Pin SO (derate 5.88mW/ C above +7 C)...471mW Operating Temperature Range...-4 C to +85 C Storage Temperature Range. -65 C to +15 C Lead Temperature (soldering, 1s).+3 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 (VOUT = 1.25V) (V IN = 5V, =, T A = T MIN to T MAX, unless otherwise specified. Typical values are at T A = +25 C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Output Voltage T A = +25 C Output Voltage Temperature Coefficient (Note 1) Line Regulation Load Regulation A 1.248 1.25 1.252 B 1.246 1.25 1.254 A 2 5 TC B 4 1 V ppm/ C V IN 2.5V < V IN < 12.6V 6 6 µv/v Sourcing: < < 4mA.5.9 Sinking: -2mA < IOUT < 1.3 2.5 Short to GND 25 OUT Short-Circuit Current I SC Short to IN 25 mv/ma ma Long-Term Stability Output Voltage Hysteresis (Note 2) DYNAMIC CHARACTERISTICS time cycle 1hr at +25 C 8 ppm/ 1hr 8 ppm f =.1Hz to 1Hz 2 µvp-p Noise Voltage e OUT f = 1Hz to 1kHz 15 µv RMS Ripple Rejection /V IN V IN = 5V ±1mV, f = 12Hz 8 db Turn-On Settling Time t R to.1% of final value, C OUT = 5pF 5 µs Capacitive-Load Stability Range (Note 3) INPUT CHARACTERISTICS C OUT 1. µf Supply Voltage Range V IN Guaranteed by line-regulation test +.2 12.6 V Quiescent Supply Current I IN 9 12 µa Change in Supply Current I IN / V IN 2.5V < V IN < 12.6V 3.2 8. µa/v 2
ELECTRICAL CHARACTERISTICS MAX6162 (VOUT = 2.48V) (V IN = 5V, =, T A = T MIN to T MAX, unless otherwise specified. Typical values are at T A = +25 C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Output Voltage T A = +25 C Output Voltage Temperature Coefficient (Note 1) MAX6162A 2.46 2.48 2.5 MAX6162B 2.43 2.48 2.53 MAX6162A 2 5 TC MAX6162B 4 1 Line Regulation 2.5V < V IN < 12.6V 42 13 µv/v Load Regulation Sourcing: < < 5mA.5.9 Sinking: -2mA < IOUT < 1.5 4 Short to GND 25 OUT Short-Circuit Current I SC Short to IN 25 Long-Term Stability Output Voltage Hysteresis (Note 2) DYNAMIC CHARACTERISTICS time cycle 1hr at +25 C 8 V ppm/ C mv/ma ma ppm/ 1hr 8 ppm f =.1Hz to 1Hz 22 µvp-p Noise Voltage e OUT f = 1Hz to 1kHz 22 µv RM S MAX6167 Ripple Rejection /V IN V IN = 5V ±1mV, f = 12Hz 78 db Turn-On Settling Time t R to.1% of final value, C OUT = 5pF 1 µs Capacitive-Load Stability Range (Note 3) INPUT CHARACTERISTICS C OUT 1. µf Supply Voltage Range V IN Guaranteed by line-regulation test +.2 12.6 V Quiescent Supply Current I IN 9 12 µa Change in Supply Current I IN / V IN 2.5V < V IN < 12.6V 3.4 8. µa/v 3
MAX6167 ELECTRICAL CHARACTERISTICS MAX6166 (VOUT = 2.5V) (V IN = 5V, =, T A = T MIN to T MAX, unless otherwise specified. Typical values are at T A = +25 C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Output Voltage T A = +25 C Output Voltage Temperature Coefficient (Note 1) MAX6166A 2.498 2.5 2.52 MAX6166B 2.495 2.5 2.55 MAX6166A 2 5 TC MAX6166B 4 1 Dropout Voltage (Note 4) V IN - = 1mA 5 2 mv Line Regulation Load Regulation V ppm/ C V IN +.2V < V IN < 12.6V 6 22 µv/v Sourcing: < < 5mA.5.9 Sinking: -2mA < IOUT < 1.6 5 Short to GND 25 OUT Short-Circuit Current I SC Short to IN 25 Long-Term Stability Output Voltage Hysteresis (Note 2) DYNAMIC CHARACTERISTICS time cycle 1hr at +25 C 8 mv/ma ma ppm/ 1hr 8 ppm f =.1Hz to 1Hz 27 µvp-p Noise Voltage e OUT f = 1Hz to 1kHz 3 µv RMS Ripple Rejection /V IN V IN = 5V ±1mV, f = 12Hz 76 db Turn-On Settling Time t R to.1% of final value, C OUT = 5pF 115 µs Capacitive-Load Stability Range (Note 3) INPUT CHARACTERISTICS C OUT 1. µf Supply Voltage Range V IN Guaranteed by line-regulation test +.2 12.6 V Quiescent Supply Current I IN 9 12 µa Change in Supply Current I IN / V IN +.2V < V IN < 12.6V 3.2 8. µa/v 4
ELECTRICAL CHARACTERISTICS MAX6163 (VOUT = 3.V) (V IN = 5V, =, T A = T MIN to T MAX, unless otherwise specified. Typical values are at T A = +25 C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Output Voltage T A = +25 C Output Voltage Temperature Coefficient (Note 1) TC -4 C to +85 C MAX6163A 2.998 3. 3.2 MAX6163B 2.995 3. 3.5 MAX6163A 2 5 MAX6163B 4 1 Dropout Voltage (Note 4) V IN - = 1mA 5 2 mv Line Regulation Load Regulation V ppm/ C V IN +.2V < V IN < 12.6V 83 3 µv/v Sourcing: < < 5mA.5.9 Sinking: -2mA < IOUT < 1.8 5 Short to GND 25 OUT Short-Circuit Current I SC Short to IN 25 Long-Term Stability time 1hr at +25 C 8 mv/ma ma ppm/ 1hr MAX6167 Output Voltage Hysteresis (Note 2) DYNAMIC CHARACTERISTICS cycle 8 ppm f =.1Hz to 1Hz 35 µvp-p Noise Voltage e OUT f = 1Hz to 1kHz 4 µv RMS Ripple Rejection /V IN V IN = 5V ±1mV, f = 12Hz 76 db Turn-On Settling Time t R to.1% of final value, C OUT = 5pF 115 µs Capacitive-Load Stability Range (Note 3) INPUT CHARACTERISTICS C OUT 1. µf Supply Voltage Range V IN Guaranteed by line-regulation test +.2 12.6 V Quiescent Supply Current I IN 9 12 µa Change in Supply Current I IN / V IN +.2V < V IN < 12.6V 3.2 8. µa/v 5
MAX6167 ELECTRICAL CHARACTERISTICS MAX6164 (VOUT = 4.96V) (V IN = 5V, =, T A = T MIN to T MAX, unless otherwise specified. Typical values are at T A = +25 C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Output Voltage T A = +25 C Output Voltage Temperature Coefficient (Note 1) MAX6164A 4.94 4.96 4.98 MAX6164B 4.91 4.96 4.11 MAX6164A 2 5 TC MAX6164B 4 1 Dropout Voltage (Note 4) V IN - = 1mA 5 2 mv Line Regulation Load Regulation V ppm/ C V IN +.2V < V IN < 12.6V 14 3 µv/v Sourcing: < < 5mA.6.9 Sinking: -2mA < IOUT < 2. 7. Short to GND 25 OUT Short-Circuit Current I SC Short to IN 25 Long-Term Stability Output Voltage Hysteresis (Note 2) DYNAMIC CHARACTERISTICS time cycle 1hr at +25 C 8 mv/ma ma ppm/ 1hr 8 ppm f =.1Hz to 1Hz 5 µvp-p Noise Voltage e OUT f = 1Hz to 1kHz 5 µv RMS Ripple Rejection /V IN V IN = 5V ±1mV, f = 12Hz 72 db Turn-On Settling Time t R to.1% of final value, C OUT = 5pF 19 µs Capacitive-Load Stability Range (Note 3) INPUT CHARACTERISTICS C OUT 1. µf Supply Voltage Range V IN Guaranteed by line-regulation test +.2 12.6 V Quiescent Supply Current I IN 9 12 µa Change in Supply Current I IN / V IN +.2V < V IN < 12.6V 3.2 8. µa/v 6
ELECTRICAL CHARACTERISTICS MAX6167 (VOUT = 4.5V) (V IN = 5V, =, T A = T MIN to T MAX, unless otherwise specified. Typical values are at T A = +25 C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Output Voltage T A = +25 C Output Voltage Temperature Coefficient (Note 1) MAX6167A 4.498 4.5 4.52 MAX6167B 4.495 4.5 4.55 MAX6167A 2 5 TC MAX6167B 4 1 Dropout Voltage (Note 4) V IN - = 1mA 5 2 mv Line Regulation Load Regulation V ppm/ C V IN +.2V < V IN < 12.6V 16 45 µv/v Sourcing: < < 5mA.6.9 Sinking: -2mA < IOUT < 2.3 8. Short to GND 25 OUT Short-Circuit Current I SC Short to IN 25 Long-Term Stability Output Voltage Hysteresis (Note 2) DYNAMIC CHARACTERISTICS time VOUT/ cycle 1hr at +25 C 8 mv/ma ma ppm/ 1hr 8 ppm f =.1Hz to 1Hz 55 µvp-p Noise Voltage e OUT f = 1Hz to 1kHz 55 µv RMS MAX6167 Ripple Rejection /V IN V IN = 5V ±1mV, f = 12Hz 7 db Turn-On Settling Time t R to.1% of final value, C OUT = 5pF 23 µs Capacitive-Load Stability Range (Note 3) INPUT CHARACTERISTICS C OUT 1. µf Supply Voltage Range V IN Guaranteed by line-regulation test +.2 12.6 V Quiescent Supply Current I IN 9 12 µa Change in Supply Current I IN / V IN +.2V < V IN < 12.6V 3.1 8. µa/v 7
MAX6167 ELECTRICAL CHARACTERISTICS (VOUT = 5.V) (V IN = 5V, =, T A = T MIN to T MAX, unless otherwise specified. Typical values are at T A = +25 C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Output Voltage T A = +25 C Output Voltage Temperature Coefficient (Note 1) A 4.998 5. 5.2 B 4.995 5. 5.5 A 2 5 TC B 4 1 Dropout Voltage (Note 4) V IN - = 1mA 5 2 mv Line Regulation +.2V < V IN < 12.6V 18 4 µv/v Load Regulation Sourcing: < < 5mA.6.9 Sinking: -2mA < IOUT < 2.4 8. Short to GND 25 OUT Short-Circuit Current I SC Short to IN 25 Long-Term Stability Output Voltage Hysteresis (Note 2) DYNAMIC CHARACTERISTICS time cycle 1hr at +25 C 8 V ppm/ C mv/ma ma ppm/ 1hr 8 ppm f =.1Hz to 1Hz 6 µvp-p Noise Voltage e OUT f = 1Hz to 1kHz 6 µv RMS Ripple Rejection /V IN V IN = 5V ± 1mV, f = 12Hz 65 db Turn-On Settling Time t R to.1% of final value, C OUT = 5pF 3 µs Capacitive-Load Stability Range (Note 3) INPUT CHARACTERISTICS C OUT 1. µf Supply Voltage Range V IN Guaranteed by line-regulation test +.2 12.6 V Quiescent Supply Current I IN 9 12 µa Change in Supply Current I IN / V IN +.2V < V IN < 12.6V 3.1 8. µa/v Note 1: Temperature Coefficient is specified by the box method; i.e., the maximum is divided by the maximum T. Note 2: Thermal Hysteresis is defined as the change in T A = +25 C output voltage before and after temperature cycling of the device (from T A = T MIN to T MAX ). Initial measurement at T A = +25 C is followed by temperature cycling the device to T A = +85 C then to T A = -4 C, and another measurement at T A = +25 C is compared to the original measurement at T A = +25 C. Note 3: Not production tested. Guaranteed by design. Note 4: Dropout voltage is the minimum input voltage at which changes.2% from at V IN = 5.V (V IN = 5.5V for ). 8
OUTPUT VOLTAGE (V) 2.49 2.48 MAX6162 OUTPUT VOLTAGE TEMPERATURE DRIFT THREE TYPICAL PARTS 2.47-4 -15 1 35 6 65 TEMPERATURE ( C) /67 toc1 OUTPUT VOLTAGE (V) 5.3 5.2 5.1 5. 4.999 4.998 OUTPUT VOLTAGE TEMPERATURE DRIFT THREE TYPICAL PARTS -4-15 1 35 6 85 TEMPERATURE ( C) Typical Operating Characteristics (V IN = +5V for /2/3/4/6/7, V IN = +5.5V for, =, T A = +25 C, unless otherwise noted.) (Note 5) /67 toc2 PPM 35 3 25 2 15 1 5 PPM vs. TIME 2 4 6 8 1 TIME (hr) /67 toc3 MAX6167 PPM 8 7 6 5 4 3 2 1 PPM vs. TIME /67 toc4 OUTPUT VOLTAGE CHANGE (µv) 3 2 1-1 -2 T A = -4 C LINE REGULATION T A = +25 C T A = +85 C /67 toc5 OUTPUT VOLTAGE CHANGE (µv) 2-2 -4-6 -8-1 T A = +85 C LINE REGULATION T A = +25 C T A = -4 C /67 toc6 OUTPUT VOLTAGE CHANGE (mv) 5 4 3 2 1-1 -2 2 4 6 8 1 TIME (hr) LOAD REGULATION T A = -4 C T A = +85 C T A = +25 C /67 toc7 OUTPUT VOLTAGE CHANGE (mv) -3 12 1 8 6 4 2-2 -4 2 4 6 8 1 12 INPUT VOLTAGE (V) T A = +25 C LOAD REGULATION T A = +85 C T A = -4 C /67 toc8 DROPOUT VOLTAGE (V) -12.3.25.2.15.1.5 5 7 9 11 13 INPUT VOLTAGE (V) MAX6166 DROPOUT VOLTAGE vs. LOAD CURRENT T A = +25 C T A = +85 C T A = -4 C /67 toc9-3 -4-2 2 4 LOAD CURRENT (ma) -6-6 -4-2 2 4 6 LOAD CURRENT (ma) 1 2 3 4 5 LOAD CURRENT (ma) 9
MAX6167 DROPOUT VOLTAGE (V).25.2.15.1.5 DROPOUT VOLTAGE vs. LOAD CURRENT T A = +25 C T A = +85 C T A = -4 C 1 2 3 4 5 LOAD CURRENT (ma) /67 toc1 PSRR (db) Typical Operating Characteristics (continued) (V IN = +5V for /2/3/4/6/7, V IN = +5.5V for, =, T A = +25 C, unless otherwise noted.) (Note 5) SUPPLY CURRENT (µa) 11 1 9 8 SUPPLY CURRENT vs. INPUT VOLTAGE /67 toc13 SUPPLY CURRENT (µa) -1-2 -3-4 -5-6 -7-8 -9 115 11 15 1 95 9 85 POWER-SUPPLY REJECTION RATIO vs. FREQUENCY.1.1.1 1 1 1 1 FREQUENCY (khz) SUPPLY CURRENT vs. INPUT VOLTAGE /67 toc11 /67 toc14 PSRR (db) SUPPLY CURRENT (µa) -1-2 -3-4 -5-6 -7 POWER-SUPPLY REJECTION RATIO vs. FREQUENCY -8.1.1 1 1 12 11 1 9 8 FREQUENCY (khz) SUPPLY CURRENT vs. TEMPERATURE V IN = 12.5V V IN = 7.5V V IN = 2.5V V IN = 5.5V /67 toc12 /67 toc15 SUPPLY CURRENT (µa) 7 115 15 95 85 2 4 6 8 1 12 INPUT VOLTAGE (V) SUPPLY CURRENT vs. TEMPERATURE V IN = 12.5V V IN = 7.5V V IN = 5.5V -4-15 1 35 6 85 TEMPERATURE ( C) /67 toc16 OUTPUT IMPEDANCE (Ω) 8 22 2 18 16 14 12 1 8 6 4 2 5 7 9 11 13 INPUT VOLTAGE (V) OUTPUT IMPEDANCE vs. FREQUENCY.1.1 1 1 FREQUENCY (khz) /67 toc17 OUTPUT IMPEDANCE (Ω) 18 16 14 12 6 7 1 8 4 2-4 -15 1 35 6 85 TEMPERATURE ( C) OUTPUT IMPEDANCE vs. FREQUENCY.1.1 1 1 FREQUENCY (khz) /67 toc18 1
1µV/div.1Hz TO 1Hz OUTPUT NOISE TIME (1s/div) /67 toc19 Typical Operating Characteristics (continued) (V IN = +5V for /2/3/4/6/7, V IN = +5.5V for, =, T A = +25 C, unless otherwise noted.) (Note 5) 1µV/div NOISE TIME (1s/div) /67 toc2 5mV/div V IN 5V/div TURN-ON TRANSIENT (C L = 5pF) TIME (1µs/div) /67 toc21 MAX6167 TURN-ON TRANSIENT (C L = 5pF) ( = ±25µA, V IN = 5., C L = µf) /67 toc23 ( = ±25µA, C L = µf, V IN = 5.5V) /67 toc24 2V/div /67 toc22 5µA/div IOUT +25µA IOUT -25µA 5µA/div +25µA -25µA 5mV/div V IN 5V/div TIME (4µs/div) 1mV/div ( = ±25µA, V IN = 5.V, C L = 1µF) /67 toc25 TIME (4µs/div) TIME (4µs/div) ( = ±25µA, C L = 1µF, V IN = 5.5V) /67 toc26 5µA/div +25µA -25µA 5µA/div +25µA -25µA 1mV/div 2mV/div TIME (4µs/div) TIME (4µs/div) 11
MAX6167 Typical Operating Characteristics (continued) (V IN = +5V for /2/3/4/6/7, V IN = +5.5V for, =, T A = +25 C, unless otherwise noted.) (Note 5) 5mA/div 1mV/div (V IN = 5.V, C L = µf, = ±2mA) TIME (4µs/div) /67 toc27 +2mA -2mA 5mA/div 5mV/div (C L = µf, = ±2mA, V IN = 5.5V) TIME (4µs/div) /67 toc28 +2mA -2mA (V IN = 5.V, C L = 1µF, = ±2mA) /67 toc29 (C L = 1µF, = ±2mA, V IN = 5.5V) /67 toc3 5mA/div +2mA -2mA 5mA/div +2mA -2mA 5mV/div 2mV/div TIME (4µs/div) (V IN = 5.V, C L = µf, = ±4mA) /67 toc31 TIME (4µs/div) ( = ±5mA, C L = µf, V IN = 5.5V) /67 toc32 +4mA +5mA 5mA/div -4mA 5mA/div -5mA 2mV/div 1mV/div TIME (4µs/div) TIME (4µs/div) 12
5mA/div 5mV/div (V IN = 5.V, C L = 1µF, = ±4mA) Typical Operating Characteristics (continued) (V IN = +5V for /2/3/4/6/7, V IN = +5.5V for, =, T A = +25 C, unless otherwise noted.) (Note 5) /67 toc33 +4mA -4mA 5mA/div 5mV/div ( = ±5mA, C L = 1µF, V IN = 5.5V) /67 toc34 +5mA -5mA MAX6167 TIME (4µs/div) LINE TRANSIENT (C L = ) /67 toc35 TIME (4µs/div) LINE TRANSIENT (C L = ) /67 toc36 +.25 +.25 V IN 5mV/div -.25 V IN 5mV/div -.25 2mV/div 2mV/div TIME (4µs/div) TIME (4µs/div) Note 5: Many of the family Typical Operating Characteristics are extremely similar. The extremes of these characteristics are found in the (1.25V output) and the (5.V output). The Typical Operating Characteristics of the remainder of the family typically lie between these two extremes and can be estimated based on their output voltages. Pin Description PIN MAX617_ NAME FUNCTION 1, 3, 5, 7, 8 2 6 4 N.C. IN OUT GND No Connection. Not internally connected. Input Voltage Reference Output Ground 13
MAX6167 Applications Information Input Bypassing For the best line-transient performance, decouple the input with a.1µf ceramic capacitor as shown in the Typical Operating Circuit. Locate the capacitor as close to IN as possible. When transient performance is less important, no capacitor is necessary. Output/Load Capacitance Devices in the family do not require an output capacitor for frequency stability. They are stable for capacitive loads from to 1µF. However, in applications where the load or the supply can experience step changes, an output capacitor will reduce the amount of overshoot (undershoot) and improve the circuit s transient response. Many applications do not require an external capacitor, and the family can offer a significant advantage in applications when board space is critical. Supply Current The quiescent supply current of the series-mode family is typically 9µA and is virtually independent of the supply voltage, with only a 8µA/V (max) variation with supply voltage. Unlike series references, shunt-mode references operate with a series resistor connected to the power supply. The quiescent current of a shunt-mode reference is thus a function of the input voltage. Additionally, shunt-mode references have to be biased at the maximum expected load current, even if the load current is not present at the time. In the family, the load current is drawn from the input voltage only when required, so supply current is not wasted and efficiency is maximized at all input voltages. This improved efficiency reduces power dissipation and extends battery life. When the supply voltage is below the minimum specified input voltage (as during turn-on), the devices can draw up to 4µA beyond the nominal supply current. The input voltage source must be capable of providing this current to ensure reliable turn-on. Output Voltage Hysteresis Output voltage hysteresis is the change in the input voltage at TA = +25 C 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 temperature hysteresis value is 8ppm. Turn-On Time These devices typically turn on and settle to within.1% of their final value in 5µs to 3µs, depending on the output voltage (see electrical table of part used). The turn-on time can increase up to 1.5ms with the device operating at the minimum dropout voltage and the maximum load. Positive and Negative Low-Power Voltage Reference Figure 1 shows a typical method for developing a bipolar reference. The circuit uses a MAX681 voltage doubler/inverter charge-pump converter to power an ICL7652, thus creating a positive as well as a negative reference voltage. V S V CC V+ MAX681 GND V- +2V S -2V S IN MAX6167 GND OUT 1M,.1% 1M,.1% 1nF V+ ICL7652 V- +REF OUTPUT OUTPUT -REF OUTPUT Figure 1. Positive and Negative References from Single +3V or +5V Supply Typical Operating Circuit.1µF* +SUPPLY INPUT (SEE SELECTOR GUIDE) *CAPACITORS ARE OPTIONAL. IN MAX6167 GND OUT REFERENCE OUT 1µF MAX* Chip Topography TRANSISTOR COUNT:117 PROCESS: BiCMOS 14
PART OUTPUT VOLTAGE (V) INITIAL ACCURACY (mv) Selector Guide TEMPERATURE COEFFICIENT (ppm/ C) A 1.25 ±2 5 B 1.25 ±4 1 MAX6162A 2.48 ±2 5 MAX6162B 2.48 ±5 1 MAX6166A 2.5 ±2 5 MAX6166B 2.5 ±5 1 MAX6163A 3. ±2 5 MAX6163B 3. ±5 1 MAX6164A 4.96 ±2 5 MAX6164B 4.96 ±5 1 MAX6167A 4.5 ±2 5 MAX6167B 4.5 ±5 1 A 5. ±2 5 B 5. ±5 1 MAX6167 15
MAX6167 Package Information SOICN.EPS 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. 16 Maxim Integrated Products, 12 San Gabriel Drive, Sunnyvale, CA 9486 48-737-76 2 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.