LINEAR BUILDING BLOCK – VOLTAGE REFERENCE, DUAL OP AMP, EVALUATION DUAL COMPARATOR WITH SHUTDOWN MODE PRELIMINARY INFORMATION KIT AVAILABLE TC43 TC43 LINEAR BUILDING BLOCK – VOLTAGE REFERENCE, DUAL OP AMP, DUAL COMPARATOR WITH SHUTDOWN MODE FEATURES GENERAL DESCRIPTION ■ The TC43 is a mixed-function device combining two general purpose op amps, two general purpose comparators and a voltage reference in a single 16-pin package. This increased integration allows the user to replace two or three packages, saving space, lowering supply current, and increasing system performance. A Shutdown input, SHDN, disables the op amps and one of the comparators, placing their outputs in a high-impedance state. The reference and one comparator stay active in Shutdown Mode. Standby power consumption is typically 5µA. The TC43 is designed specifically for operation from a single supply, however, operation from dual supplies is also possible, and the power supply current drain is independent of the magnitude of the power supply voltage. Packaged in a 16-pin narrow SOIC (0.150 wide) or 16-pin DIP, the TC43 is ideal for applications requiring high integration, small size and low power. ■ ■ ■ ■ ■ Combines Two Op Amps, Two Comparators and a Voltage Reference into a Single Package Optimized for Single Supply Operation Small Package .......... 16-Pin SOIC or DIP (Narrow) Ultra Low Input Bias Current ...... Less than 100pA Low Quiescent Current ..................... 10µA, 5µA in Shutdown Mode Reference and One Comparator Remain Active in Shutdown to Provide Supervisory Functions APPLICATIONS ■ ■ ■ ■ ■ ■ Power Supply Circuits Embedded Systems Instrumentation Portable Equipment Consumer Products Replacements for Discrete Components FUNCTIONAL BLOCK DIAGRAM A1IN+ + PIN CONFIGURATIONS (DIP and SOIC) VDD A1IN+ 1 16 VDD A1IN+ 1 16 VDD 15 A1OUT 14 A2OUT A1IN– 2 A1OUT A1IN– 2 A2IN+ 3 15 A1OUT 14 A2OUT AMP 1 A1IN– A2IN+ – A2IN– 4 TC43CPR 13 C1IN+ C1OUT 5 TC43EPR 12 C1 IN– C2OUT 6 11 C2 + IN A2OUT + SHDN 7 AMP 2 A2IN– – VSS 8 + 10 C2IN– 9 VREF A2IN+ 3 A2IN– 4 C1OUT 5 TC43COR TC43EOR 13 C1 + IN 12 C1 – IN C2OUT 6 11 C2IN+ SHDN 7 10 C2IN– 9 VREF VSS 8 C1IN+ CMPTR 1 C1OUT – C1IN– ORDERING INFORMATION C2OUT + Part No. C2IN+ CMPTR 2 SHDN VSS TC43-1 3/12/97 – C2IN– VREF+ 1 Package Temp. Range TC43COR 16-Pin SOIC (Narrow) 0°C to +70°C TC43CPR 16-Pin Plastic DIP (Narrow) 0°C to +70°C TC43EOR 16-Pin SOIC (Narrow) – 40°C to +85°C TC43EPR 16-Pin Plastic DIP (Narrow) – 40°C to +85°C TC43EV Evaluation Kit for TC43 TelCom Semiconductor reserves the right to make changes in the circuitry and specifications of its devices. PRELIMINARY INFORMATION LINEAR BUILDING BLOCK – VOLTAGE REFERENCE, DUAL OP AMP, DUAL COMPARATOR WITH SHUTDOWN MODE TC43 ABSOLUTE MAXIMUM RATINGS* Storage Temperature Range ................ – 65°C to +150°C Lead Temperature (Soldering, 10 sec) ................. +300°C Supply Voltage .............................................................. 6V Package Power Dissipation (TA ≤ 70°C) PDIP .............................................................. 840mW SOIC (Narrow) ................................................700mW Voltage on Any Pin: (With Respect to GND) ........ (VSS – 0.3V) to (VDD +0.3V) Operating Temperature Range: C Suffix ................................................. 0°C to +70°C E Suffix ............................................ – 40°C to + 85°C * Static-sensitive device. Unused devices must be stored in conductive material. Protect devices from static discharge and static fields. Stresses above 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 above 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: TA = Over Operating Temperature Range, VDD = 5.0V ±10%, VSS = 0V, SHDN = VDD, unless otherwise specified. Symbol Parameter VDD IQ ISHDN Supply Voltage Supply Current, Operating Supply Current, Shutdown Mode Test Conditions All Outputs Open All Outputs Open (Note 1) Min Typ Max Unit 1.8 — — — 10 5 5.5 15 8 V µA µA 80% VDD — — — — — — 20% VDD 1 V V µA — — — VSS –10 — — 4 — 2 5 100 — ±1.0 50 30 7 2 Shutdown Input VIH VIL IIL Input High Voltage Input Low Voltage Input Current Op Amps TSEL TDESEL AVOL VICMR VOS IB VOS (DRIFT) GBWP SR Select Time (VOUT from SHDN = VIH) Deselect Time (HI-Z from SHDN = VIL) Large Signal Voltage Gain Common Mode Input Voltage Range Input Offset Voltage Input Bias Current Average Input Offset Voltage Drift Gain-Bandwidth Product Slew Rate VOUT CMRR PSRR Output Signal Swing Common Mode Rejection Ratio Power Supply Rejection Ratio Gain = 1, VIN = 4.0P-P CL = 100pF, RL = 1MΩ to VSS RL = 47kΩ VSS + .20 — (4.5V to 5.5V) — ROUT(SD) Output Resistance in Shutdown SHDN = VSS COUT(SD) Output Capacitance in Shutdown ISRC DC Output Source Current ISINK DC Output Sink Current CL = 100pF, RL = 47kΩ 1.8 < VDD < 5.5V VCM = (VDD – VSS)/2 — msec — µsec — dB VDD – 1.0 V +10 mV — pA — µV/°C — kHz — V/msec — 80 80 VDD – .15 — — V dB dB 20 — — MΩ SHDN = VSS (Note 5) — 40 55 pF VIN = VDD Output Shorted to VSS (Note 2) 3 8 20 mA VIN = VSS Output Shorted to VDD (Note 2) 0.6 1.2 5 mA — 5 — µsec Comparators TSEL CMPTR1 Select Time (VOUT from SHDN = VIH) 2 LINEAR BUILDING BLOCK – VOLTAGE REFERENCE, DUAL OP AMP, DUAL COMPARATOR WITH SHUTDOWN MODE PRELIMINARY INFORMATION TC43 ELECTRICAL CHARACTERISTICS: (Cont.) TA = Over Operating Temperature Range, VDD = 5.0V ±10%, VSS = 0V, SHDN = VDD, unless otherwise specified. Symbol Parameter Test Conditions Min Typ Max Unit — 5 — µsec — — — 50 — VDD VDD +10 — — V V mVDC pA V — 0.3 V 3 8 mA 6 15 mA 15 60 — — µsec µsec Comparators (Cont.) TDESEL VIN VIN(CM) VOS IB VOH CMPTR1 Deselect time (HI-Z from SHDN = VIL) Differential Input Voltage Range Input Common Mode Voltage Range Input Offset Voltage Input Bias Current Output High Voltage VOL Output Low Voltage IOH Output Source Current (Continuous) IOL Output Sink Current (Continuous) tPD1 tPD2 Response Time Response Time Both VINs > = VSS — Note 3, 5 VSS VCM = (VDD – VSS)/2 – 10 IN+ or IN– — RL = 10kΩ to VSS, VDD – 0.3 1.8 < VDD < 5.5V RL = 10kΩ to VDD — 1.8 < VDD < 5.5V VIN (+) = VDD, VIN (–) = VSS 1.3 VDD = 1.8V, Output Shorted to VSS VIN (–) = VDD, VIN (+) = VSS 2.5 VDD = 1.8V, Output Shorted to VDD 100mV Overdrive (Note 4) — 10mV Overdrive (Note 4) — ROUT(SD) Output Resistance in Shutdown SHDN = VSS 20 — — MΩ COUT(SD) Output Capacitance in Shutdown SHDN = VSS (Note 5) — 3 5 pF VREF Reference Voltage Load Regulation No Load 0mA < ISOURCE < 5mA VDD = 5V, TA = 25°C 1.152 — 1.200 – 300 1.248 — V µV/mA CL(REF) NVREF Load Capacitance Voltage Noise — — — 100 100 — pF µVRMS Voltage Reference 100Hz to 100kHz NOTES: 1. The reference and one comparator remain active in SHUTDOWN mode. 2. Op Amp configured as a voltage follower (inverting input connected to output; signal applied to non-inverting input). 3. Input common-mode voltage should not be allowed to go negative by more than 0.3V. 4. VDD = 5.0V; CL = 100pF. 5. Guaranteed by Design DETAILED DESCRIPTION Operational Amplifiers The TC43 is the first of a series of very low power, Linear Building Block products targeted at low voltage, single supply applications. The TC43 minimum operating voltage is 1.8V and maximum supply current is only 15µA (fully enabled). It combines two comparators, two op amps and a voltage reference in a single package. A shutdown mode is incorporated for easy adaptation to system power management schemes. During shutdown, all but one comparator and the voltage reference are disabled (i.e. powered down and with their respective outputs at high impedance). The “still awake” comparator and voltage reference can be used as wake-up timer, power supply monitor, LDO controller or other continuous duty circuit function. Both op amps have rail-to-rail outputs, and an input common range that includes ground. Input offset voltage is 1.0mV and input bias current is only 50pA. The outputs are protected against short circuits. Both op amps are disabled (powered down and outputs at high impedance) during shutdown. Comparators Both comparators feature complimentary outputs with current sinking capability of 2.5mA. Inputs and outputs are rail-to-rail. Comparator CMPTR1 is disabled (powered down and outputs at high impedance) during shutdown. CMPTR2 remains fully enabled during shutdown. 3 PRELIMINARY INFORMATION LINEAR BUILDING BLOCK – VOLTAGE REFERENCE, DUAL OP AMP, DUAL COMPARATOR WITH SHUTDOWN MODE TC43 tor C1 charges through R1 until a voltage equal to VDD/2 is reached, at which point the WAKE is driven active. Upon wake-up, the microcontroller resets the timer by forcing a logic low on a dedicated, open drain I/O port pin. This discharges C1 through R4 (the value of R4 is chosen to limit maximum current sunk by the I/O port pin). With a 3V supply, the circuit as shown consumes typically 8µA and furnishes a nominal timer duration of 25 seconds. Voltage Reference A 4% tolerance, internally biased, 1.20V bandgap voltage reference is included in the TC43. It has a push-pull output capable of sourcing 5mA or sinking 200µA. The voltage reference remains fully enabled during shutdown. Shutdown Input SHDN at VIL disables both op amps and one comparator. The SHDN input cannot be allowed to float; when not used, connect to VDD. Precision Battery Monitor Figure 2 is a precision battery low/battery dead monitoring circuit. Typically, the battery low output warns the user that a battery dead condition is eminent. Battery dead typically initiates a forced shutdown to prevent operation at low internal supply voltages (which can cause unstable system operation). The circuit of Figure 2 uses a single TC43 (one Op Amp unused) and only 7 external resistors. AMP 1 is a simple buffer while CMPTR1 and CMPTR2 provide precision voltage detection using Vr as a reference. Resistors R2 and R4 set the detection threshold for BATT LOW while resistors R1 and R7 set the detection threshold for BATT FAIL. The component values shown assert BATT LOW at 2.2V (typical) and BATT FAIL at 2.0V (typical). Total current consumed by this circuit is typically 22µA at 3V. TYPICAL APPLICATIONS The TC43 lends itself to a wide variety of applications, particularly in battery-powered systems. It typically finds application in power management, processor supervisory, and interface circuitry. Wake-up Timer Many microcontrollers have a low power “sleep” mode that significantly reduces their supply current. Typically, the microcontroller is placed in this mode via a software instruction, and returns to a fully enabled state upon reception of an external signal (“wake-up”). The wake-up signal is usually supplied by a hardware timer. Most system applications demand that this timer have a long duration (typically seconds or minutes), and consume as little supply current as possible. The circuit shown in Figure 1 is a wake-up timer made from comparator CMPTR2. (CMPTR2 is used because the wake-up timer must operate when SHDN is active.) Capaci- DUAL LDO with Shutdown Figure 3 shows a portion of a TC43 configured as a dual low drop regulator with shutdown. AMP1 and AMP2 are independent error amplifiers that use Vr as a reference. Resistors RA and RB set the feedback around the amplifier and therefore determine the output voltage setting (please see equation in the figure). RA and RB can have large ohmic values (i.e. 100’s of KΩ) to minimize supply current. Using the 2N2222 output transistors as shown, these regulators exhibit low dropout operation. For example, with VOUT = 3.0V, the typical drop out voltage is only 50mV at an output current of 50mA. The unused comparators can be used in conjunction with this circuit as power-on reset or low voltage detectors for a complete LDO solution at a very low installed cost. MICROCONTROLLER R4 I/O* VDD R1 5M – C1 10µF CMPTR2 + WAKE-UP EVALUATION KIT The TC43EV consists of a four inch by six inch pre-wired application circuit board. Pre-configured circuits include a pulse width modulator, wake-up timer, function generator, and others. On-board current meter terminals, voltage regulator and a user-prototyping area speed circuit development. Please contact your local TelCom Semiconductor representative for more information. R2, 1M R3, 1M *OPEN DRAIN PORT PIN Figure 1. Wake-Up Timer 4 LINEAR BUILDING BLOCK – VOLTAGE REFERENCE, DUAL OP AMP, DUAL COMPARATOR WITH SHUTDOWN MODE PRELIMINARY INFORMATION TC43 TO SYSTEM DC/DC CONVERTER R4, 470k, 1% R5, 7.5M + R2, 330k, 1% + AMP1 – CMPTR1 BATTLOW – 3V ALKALINE +5V R1, 270k, 1% TC43 Vr – CMPTR2 BATTFAIL + R6, 7.5M R3, 470k, 1% Figure 2. Precision Battery Monitor VIN SHDN + + – – Vr 2N2222 AMP2 2N2222 AMP1 VOUT2 VOUT1 RA C1, 1µF RA RB TC43 VOUT = Vr x (RA + RB)/RB Figure 3. Dual Low Dropout Regulator 5 RB C2, 1µF PRELIMINARY INFORMATION LINEAR BUILDING BLOCK – VOLTAGE REFERENCE, DUAL OP AMP, DUAL COMPARATOR WITH SHUTDOWN MODE TC43 PACKAGE DIMENSIONS 16-Pin Plastic DIP (Narrow) PIN 1 .260 (6.60) .240 (6.10) .770 (19.56) .745 (18.92) .310 (.787) .290 (.737) .200 (5.08) .140 (3.56) .040 (1.02) .020 (0.51) .150 (3.81) .115 (2.92) .015 (0.38) .008 (0.20) 3° MIN. .400 (10.16) .310 (7.87) .110 (2.79) .090 (2.29) .070 (1.78) .045 (1.14) .022 (0.56) .015 (0.38) 16-Pin SOIC (Narrow) PIN 1 .157 (3.99) .150 (3.81) .244 (6.20) .228 (5.79) .050 (1.27) TYP .394 (10.00) .385 (9.78) .069 (1.75) .053 (1.35) .018 (0.46) .014 (0.36) 8° MAX. .010 (0.25) .007 (0.18) .050 (1.27) .016 (0.40) .010 (0.25) .004 (0.10) Dimensions: inches (mm) Sales Offices TelCom Semiconductor 1300 Terra Bella Avenue P.O. Box 7267 Mountain View, CA 94039-7267 TEL: 415-968-9241 FAX: 415-967-1590 E-Mail: firstname.lastname@example.org TelCom Semiconductor Austin Product Center 9101 Burnet Rd. Suite 214 Austin, TX 78758 TEL: 512-873-7100 FAX: 512-873-8236 6 TelCom Semiconductor H.K. Ltd. 10 Sam Chuk Street, Ground Floor San Po Kong, Kowloon Hong Kong TEL: 852-2324-0122 FAX: 852-2354-9957 Printed in the U.S.A.