TELCOM TC43EPR

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: 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.