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LINEAR BUILDING BLOCK - VOLTAGE REFERENCE, DUAL OP AMP, EVALUATION DUAL COMPARATOR WITH SHUTDOWN MODE
KIT AVAILABLE
PRELIMINARY INFORMATION
TC43 TC43
LINEAR BUILDING BLOCK - VOLTAGE REFERENCE, DUAL OP AMP, DUAL COMPARATOR WITH SHUTDOWN MODE
FEATURES
s s s s s s 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 ..................... 10A, 5A in Shutdown Mode Reference and One Comparator Remain Active in Shutdown to Provide Supervisory Functions
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 5A. 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.
APPLICATIONS
s s s s s s Power Supply Circuits Embedded Systems Instrumentation Portable Equipment Consumer Products Replacements for Discrete Components
FUNCTIONAL BLOCK DIAGRAM
PIN CONFIGURATIONS (DIP and SOIC)
A1IN+ A1IN-
+
AMP 1
VDD A1OUT
A1IN+ 1 A1IN- 2 A2IN+ 3
16 VDD 15 A1OUT 14 A2OUT
A1IN+ 1 A1IN- 2 A2IN+ 3 A2IN- 4 C1OUT 5 C2OUT 6 SHDN 7 VSS 8 TC43COR TC43EOR
16 VDD 15 A1OUT 14 A2OUT 13 C1 + IN 12 C1 - IN 11 C2IN+ 10 C2IN- 9 VREF
-
A2IN+ A2IN-
+
AMP 2
A2OUT
A2IN- 4 TC43CPR 13 C1IN+ C1OUT 5 TC43EPR 12 C1 IN- C2OUT 6 11 C2 +
IN
SHDN 7 VSS 8
-
10 C2IN- 9 VREF
+
CMPTR 1
C1IN+ C1IN-
C1OUT
-
ORDERING INFORMATION
C2OUT
+
CMPTR 2
C2IN+ C2IN-
Part No.
TC43COR TC43CPR TC43EOR TC43EPR
Package
16-Pin SOIC (Narrow) 16-Pin Plastic DIP (Narrow) 16-Pin SOIC (Narrow) 16-Pin Plastic DIP (Narrow)
Temp. Range
0C to +70C 0C to +70C - 40C to +85C - 40C to +85C
SHDN
-
VSS
VREF+
TC43EV
Evaluation Kit for TC43
TC43-1 3/12/97
TelCom Semiconductor reserves the right to make changes in the circuitry and specifications of its devices.
1
PRELIMINARY INFORMATION
LINEAR BUILDING BLOCK - VOLTAGE REFERENCE, DUAL OP AMP, DUAL COMPARATOR WITH SHUTDOWN MODE
TC43
ABSOLUTE MAXIMUM RATINGS*
Supply Voltage .............................................................. 6V Package Power Dissipation (TA 70C) 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 ................................................. 0C to +70C E Suffix ............................................ - 40C to + 85C Storage Temperature Range ................ - 65C to +150C Lead Temperature (Soldering, 10 sec) ................. +300C
* 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
VDD IQ ISHDN
Parameter
Supply Voltage Supply Current, Operating Supply Current, Shutdown Mode
Test Conditions
All Outputs Open All Outputs Open (Note 1)
Min
1.8 -- --
Typ
-- 10 5
Max
5.5 15 8
Unit
V A A
Shutdown Input
VIH VIL IIL Input High Voltage Input Low Voltage Input Current 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 80% VDD -- -- -- -- -- VSS -10 -- -- 4 -- -- -- -- 2 5 100 -- 1.0 50 30 7 2 -- 20% VDD 1 V V A
Op Amps
TSEL TDESEL AVOL VICMR VOS IB VOS (DRIFT) GBWP SR -- msec -- sec -- dB VDD - 1.0 V +10 mV -- pA -- V/C -- kHz -- V/msec
CL = 100pF, RL = 47k 1.8 < VDD < 5.5V VCM = (VDD - VSS)/2
VOUT CMRR PSRR ROUT(SD) COUT(SD) ISRC
Output Signal Swing Common Mode Rejection Ratio Power Supply Rejection Ratio Output Resistance in Shutdown Output Capacitance in Shutdown DC Output Source Current
Gain = 1, VIN = 4.0P-P CL = 100pF, RL = 1M to VSS RL = 47k VSS + .20 -- (4.5V to 5.5V) -- SHDN = VSS SHDN = VSS (Note 5) VIN = VDD Output Shorted to VSS (Note 2) VIN = VSS Output Shorted to VDD (Note 2) 20 -- 3
-- 80 80 -- 40 8
VDD - .15 -- -- -- 55 20
V dB dB M pF mA
ISINK
DC Output Sink Current
0.6
1.2
5
mA
Comparators
TSEL CMPTR1 Select Time (VOUT from SHDN = VIH)
2
--
5
--
sec
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 Comparators (Cont.)
TDESEL VIN VIN(CM) VOS IB VOH VOL IOH 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 Output Low Voltage Output Source Current (Continuous) Output Sink Current (Continuous) Response Time Response Time Output Resistance in Shutdown Output Capacitance in Shutdown Reference Voltage Load Regulation Load Capacitance Voltage Noise -- Both VINs > = VSS -- Note 3, 5 VSS VCM = (VDD - VSS)/2 - 10 IN+ or IN- -- RL = 10k to VSS, VDD - 0.3 1.8 < VDD < 5.5V RL = 10k 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) -- SHDN = VSS SHDN = VSS (Note 5) No Load 0mA < ISOURCE < 5mA VDD = 5V, TA = 25C 100Hz to 100kHz 20 -- 1.152 -- -- -- 5 -- -- -- 50 -- -- 3 -- VDD VDD +10 -- -- 0.3 8 sec V V mVDC pA V V mA
Parameter
Test Conditions
Min
Typ
Max
Unit
IOL
6
15
mA
tPD1 tPD2 ROUT(SD) COUT(SD)
15 60 -- 3 1.200 - 300 -- 100
-- -- -- 5 1.248 -- 100 --
sec sec M pF V V/mA pF VRMS
Voltage Reference
VREF
CL(REF) NVREF
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
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 15A (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.
3
Operational Amplifiers
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.
PRELIMINARY INFORMATION
LINEAR BUILDING BLOCK - VOLTAGE REFERENCE, DUAL OP AMP, DUAL COMPARATOR WITH SHUTDOWN MODE
TC43
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 200A. The voltage reference remains fully enabled during shutdown. 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 8A and furnishes a nominal timer duration of 25 seconds.
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 22A 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.) CapaciMICROCONTROLLER I/O* VDD R1 5M
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 K) 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.
R4
-
C1 10F
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.
4
R2, 1M R3, 1M
*OPEN DRAIN PORT PIN
Figure 1. Wake-Up Timer
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
+
AMP1
R2, 330k, 1%
+
CMPTR1 BATTLOW
-
-
3V ALKALINE
+5V
TC43
R1, 270k, 1% Vr
-
CMPTR2 BATTFAIL
+
R6, 7.5M
R3, 470k, 1%
Figure 2. Precision Battery Monitor
VIN
SHDN
+
AMP1 2N2222 VOUT1 RA C1, 1F
+
AMP2 2N2222 VOUT2 RA C2, 1F
-
-
Vr
RB TC43
RB
VOUT = Vr x (RA + RB)/RB
Figure 3. Dual Low Dropout Regulator 5
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) .200 (5.08) .140 (3.56) .150 (3.81) .115 (2.92)
.310 (.787) .290 (.737)
.040 (1.02) .020 (0.51)
.015 (0.38) .008 (0.20) .400 (10.16) .310 (7.87)
3 MIN.
.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) .010 (0.25) .004 (0.10)
8 MAX. .050 (1.27) .016 (0.40)
.010 (0.25) .007 (0.18)
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: liter@c2smtp.telcom-semi.com 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.

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