TS9001 1.6V Nanopower Comparator with Internal Reference

TS9001
1.6V Nanopower Comparator with Internal Reference
FEATURES
DESCRIPTION
♦ Improved Electrical Performance
over MAX9117-MAX9118
♦ Guaranteed to Operate Down to +1.6V
♦ Ultra-Low Supply Current: 600nA
♦ Internal 1.252V ±1% Reference
♦ Input Voltage Range Extends 200mV Outsidethe-Rails
♦ No Phase Reversal for Overdriven Inputs
♦ Output Stage: Push-pull (TS9001-1)
Open-Drain (TS9001-2)
♦ Crowbar-Current-Free Switching
♦ Internal Hysteresis for Clean Switching
♦ 5-pin SC70 Packaging
The nanopower TS9001-1/2 analog comparators
guarantee +1.6V operation, draw very little supply
current, and have robust input stages that can
tolerate input voltages beyond the power supply. Both
products are the first analog comparator products in
the “NanoWatt Analog” high-performance analog
integrated circuits portfolio. The TS9001-1/2 draws
600nA of supply current and includes an on-board
+1.252V±1% reference. These comparators are also
electrically and form-factor identical to the MAX9117
and the MAX9118 family of analog comparators. Both
comparators offer a 33% improvement in voltage
reference initial accuracy and the TS9001-1 offers
73% higher output current drive.
APPLICATIONS
The TS9001-1’s push-pull output drivers were
designed to drive 5mA loads from one supply rail to
the other supply rail. The TS9001-2’s open-drain
output stage make it easy to incorporate this analog
comparator into systems that operate on different
supply voltages. Both devices are available in an
ultra-small 5-pin SC70 package.
2-Cell Battery Monitoring/Management
Medical Instruments
Threshold Detectors/Discriminators
Sensing at Ground or Supply Line
Ultra-Low-Power Systems
Mobile Communications
Telemetry and Remote Systems
TYPICAL APPLICATION CIRCUIT
PART
TS9001-1
TS9001-2
INTERNAL
REFERENCE
Yes
Yes
OUTPUT
STAGE
Push-Pull
Open-Drain
INConnection
REF
REF
SUPPLY
CURRENT (nA)
600
600
Page 1
© 2014 Silicon Laboratories, Inc. All rights reserved.
TS9001
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC to VEE) ............................................ +6V
Voltage Inputs (IN+, IN-, REF) .... (VEE - 0.3V) to (VCC + 0.3V)
Output Voltage
TS9001-1 ................................. (VEE - 0.3V) to (VCC + 0.3V)
TS9001-2 ............................................... (VEE - 0.3V) to +6V
Current Into Input Pins ................................................ ±20mA
Output Current ............................................................ ±50mA
Output Short-Circuit Duration ............................................ 10s
Continuous Power Dissipation (TA = +70°C)
5-Pin SC70 (Derate 2.5mW/°C above +70°C) ....... 200 mW
Operating Temperature Range ...................... -40°C to +85°C
Junction Temperature ................................................ +150°C
Storage Temperature Range ....................... -65°C to +150°C
Lead Temperature (soldering, 10s) ............................... +300°
Electrical and thermal 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 condition beyond those indicated in the operational sections
of the specifications is not implied. Exposure to any absolute maximum rating conditions for extended periods may affect device reliability and
lifetime.
PACKAGE/ORDERING INFORMATION
ORDER NUMBER
PART
CARRIER QUANTITY
MARKING
TS9001-1IJ5
Tape
& Reel
-----
TS9001-1IJ5T
Tape
& Reel
3000
TS9001-2IJ5
Tape
& Reel
-----
Tape
& Reel
3000
TAF
TAG
TS9001-2IJ5T
Lead-free Program: Silicon Labs supplies only lead-free packaging.
Please consult Silicon Labs for products specified with wider operating temperature ranges.
Page 2
TS9001 Rev. 1.0
TS9001
ELECTRICAL CHARACTERISTICS: TS9001-1/2
VCC = +5V, VEE = 0V, VIN+ = VREF, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C. See Note 1
PARAMETER
SYMBOL
Supply Voltage Range
VCC
Supply Current
ICC
IN+ Voltage Range
VIN+
Input Offset Voltage
VOS
Input-Referred Hysteresis
VHB
Input Bias Current
Power-Supply Rejection Ratio
Output-Voltage Swing High
IB
PSRR
VCC - VOH
Output-Voltage Swing Low
VOL
Output Leakage Current
ILEAK
Output Short-Circuit Current
ISC
High-to-Low Propagation Delay
(Note 4)
tPD-
Low-to-High Propagation Delay
(Note 4)
tPD+
Rise Time
Fall Time
tRISE
tFALL
Power-Up Time
tON
Reference Voltage
VREF
CONDITIONS
Inferred from the
PSRR test
VCC = 1.6V
MIN
TA = TMIN to TMAX
TA = +25°C
TA = +25°C
TA = TMIN to TMAX
Inferred from the output swing test
TA = +25°C
(Note 2)
TA = TMIN to TMAX
(Note 3)
TA = +25°C
TA = TMIN to TMAX
VCC = 1.6V to 5.5V, TA = TMIN to TMAX
TA = +25°C
TS9001-1, VCC = 5V,
ISOURCE = 5mA
TA = TMIN to TMAX
VCC = 1.6V,
TA = +25°C
TS9001-1,
ISOURCE = 1mA
VCC = 1.6V,
TA = TMIN to TMAX
TA = +25°C
VCC = 5V, ISINK = 5mA
TA = TMIN to TMAX
VCC = 1.6V,
TA = +25°C
ISINK = 1mA
VCC = 1.6V,
TA = TMIN to TMAX
TS9001-2 only, VO = 5.5V
VCC = 5V
Sourcing, VO = VEE
VCC = 1.6V
VCC = 5V
Sinking, VO = VCC
VCC = 1.6V
VCC = 1.6V
VCC = 5V
VCC = 1.6V
TS9001-1 only
VCC = 5V
VCC = 1.6V,
RPULLUP = 100kΩ
TS9001-2 only
VCC = 5V,
RPULLUP = 100kΩ
TS9001-1 only, CL = 15pF
CL = 15pF
1.6
0.6
0.68
VCC = 5V
VEE - 0.2
2
4
0.15
MAX
UNITS
5.5
V
1
1.30
1.60
VCC + 0.2
5
10
∆VREF/ ∆VCC
Reference Load Regulation
∆VREF/ ∆IOUT ∆IOUT = 10nA
TCVREF
V
mV
mV
mV/V
100
150
mV
110
200
300
50
100
200
nA
200
mV
150
0.002
60
6
90
10
12
15
25
50
1
μA
mA
µs
µs
21
28
3.5
2
1.239
1.233
1.252
10
BW = 10Hz to 100kHz
BW = 10Hz to 100kHz, CREF = 1nF
VCC = 1.6V to 5.5V
μA
1
2
1
300
400
µs
µs
1.2
TA = +25°C
TA = TMIN to TMAX
Reference Voltage
Temperature Coefficient
Reference Output Voltage
Noise
Reference Line Regulation
en
TYP
1
0.2
0.1
±0.2
ms
1.264
1.270
V
ppm/°C
mVRMS
mV/V
mV/nA
Note 1: All specifications are 100% tested at TA = +25°C. Specification limits over temperature (TA = TMIN to TMAX) are guaranteed by
device characterization, not production tested.
Note 2: VOS is defined as the center of the hysteresis band at the input.
Note 3: The hysteresis-related trip points are defined by the edges of the hysteresis band and measured with respect to the center of
the hysteresis band (i.e., VOS). See Figure 2.
Note 4: The propagation delays are specified with an input overdrive (VOVERDRIVE) of 100mV and an output load capacitance of
CL = 15pF. VOVERDRIVE is defined above and is beyond the offset voltage and hysteresis of the comparator input. Reference
voltage error should also be included.
TS9001 Rev. 1.0
Page 3
TS9001
TYPICAL PERFORMANCE CHARACTERISTICS
VCC = +5V; VEE = 0V; CL = 15pF; VOVERDRIVE = 100mV; TA = +25°C, unless otherwise noted.
Supply Current
vs Supply Voltage and Temperature
Supply Current vs Temperature
1.3
1.1
SUPPLY CURENT - µA
SUPPLY CURENT - µA
1
1.1
TA = +85°C
0.9
0.7
TA = +25°C
TA = -40°C
0.9
VCC =+5V
0.8
VCC =+3V
0.7
0.6
VCC =+1.8V
0.5
0.5
0.4
1.5
2.5
4.5
3.5
5.5
-40
-15
35
10
60
85
TEMPERATURE - °C
SUPPLY VOLTAGE - Volt
Supply Current vs Output Transition Frequency
Output Voltage Low vs. Sink Current
35
250
VCC =+1.8V
200
25
VCC =+5V
VOL - mV
SUPPLY CURRENT - µA
30
20
15
VCC =+3V
150
VCC =+5V
VCC =+3V
100
10
VCC =+1.8V
50
5
0
0
1
10
1k
100
10k
0
2
OUTPUT TRANSITION FREQUENCY - Hz
4
6
10
12
14
16
SINK CURRENT- mA
Output Voltage Low
vs. Sink Current and Temperature
TS9001-1 Output Voltage High
vs Source Current
0.5
300
VCC =+1.8V
TA = +85°C
VCC – VOH - V
VOL - mV
VCC =+3V
0.4
200
TA = +25°C
100
TA = -40°C
0.3
VCC =+5V
0.2
0.1
0
0
0
2
4
6
8
10
12
SINK CURRENT- mA
Page 4
8
14
16
0
2
4
6
8 10 12 14 16 18 20
SOURCE CURRENT- mA
TS9001 Rev. 1.0
TS9001
TYPICAL PERFORMANCE CHARACTERISTICS
VCC = +5V; VEE = 0V; CL = 15pF; VOVERDRIVE = 100mV; TA = +25°C, unless otherwise noted.
TS9001-1 Output Voltage High
Short-Circuit Sink Current vs Temperature
vs Source Current and Temperature
0.6
120
0.5
100
SINK CURRENT- mA
VCC – VOH - V
TA = +85°C
0.4
0.3
TA = +25°C
0.2
TA = -40°C
0.1
VCC =+5V
80
60
VCC =+3V
40
VCC =+1.8V
20
0
0
0
4
8
12
16
20
-40
35
60
85
TEMPERATURE - °C
SOURCE CURRENT- mA
Offset Voltage vs Temperature
Short-Circuit Source Current vs Temperature
140
2.6
120
2.4
100
VCC =+5V
VOS - mV
SOURCE CURRENT- mA
10
-15
80
60
VCC =+3V
VCC =+1.8V, 3V
2.0
1.8
40
1.6
VCC =+1.8V
20
2.2
0
VCC =+5V
1.4
-40
-15
10
35
60
85
-40
TEMPERATURE - °C
-15
10
35
60
85
TEMPERATURE - °C
Reference Voltage vs Temperature
Hysteresis Voltage vs Temperature
1.260
5.5
REFERENCE VOLTAGE - V
1.258
5
VHB - mV
4.5
4
3.5
3
1.256
VCC =+1.8V
1.254
1.252
1.250
VCC =+3V
1.248
VCC =+5V
1.246
1.244
1.242
2.5
1.240
-40
-15
10
35
TEMPERATURE - °C
TS9001 Rev. 1.0
60
85
-40
-15
10
35
60
85
TEMPERATURE - °C
Page 5
TS9001
TYPICAL PERFORMANCE CHARACTERISTICS
VCC = +5V; VEE = 0V; CL = 15pF; VOVERDRIVE = 100mV; TA = +25°C, unless otherwise noted.
Reference Voltage vs Reference Source Current
Reference Voltage vs Supply Voltage
1.254
1.260
REFERENCE VOLTAGE - V
REFERENCE VOLTAGE - V
1.258
1.253
1.252
1.251
1.250
1.256
VCC =+1.8V
1.254
1.252
1.250
1.248
VCC =+3V, 5V
1.246
1.244
1.242
1.240
1.249
1.5
2.5
3.5
4.5
5.5
0
Reference Voltage
vs Reference Sink Current
28
1.258
26
10
24
VCC =+1.8V
VCC =+5V
22
1.254
VCC =+3V
20
VCC =+3V, 5V
1.252
8
6
Propagation Delay (tPD-) vs Temperature
1.260
tPD- - µs
REFERENCE VOLTAGE - V
4
SOURCE CURRENT- nA
SUPPLY VOLTAGE - Volt
1.256
2
1.250
1.248
18
16
14
1.246
12
1.244
10
1.242
8
1.240
VCC =+1.8V
6
0
2
4
8
6
10
-40
SINK CURRENT- nA
-15
10
35
60
85
TEMPERATURE - °C
Propagation Delay (tPD-) vs Capacitive Load
TS9001-1 Propagation Delay (tPD+) vs Temperature
70
200
60
180
VCC =+5V
160
140
VCC =+3V
40
tPD- - µs
tPD+ - µs
50
30
VCC =+1.8V
120
100
VCC =+3V
60
20
VCC =+1.8V
40
10
20
0
0
-40
-15
10
35
TEMPERATURE - °C
Page 6
VCC =+5V
80
60
85
0.01
0.1
1
10
100
1000
CAPACITIVE LOAD - nF
TS9001 Rev. 1.0
TS9001
TYPICAL PERFORMANCE CHARACTERISTICS
VCC = +5V; VEE = 0V; CL = 15pF; VOVERDRIVE = 100mV; TA = +25°C, unless otherwise noted.
TS9001-1 Propagation Delay (tPD+) vs Capacitive Load
180
Propagation Delay (tPD-) vs Input Overdrive
80
160
70
140
60
VCC =+1.8V
VCC =+5V
50
VCC =+3V
100
tPD- - µs
tPD+ - µs
120
VCC =+5V
80
40
VCC =+3V
30
60
20
40
VCC =+1.8V
10
20
0
0
0.01
1
0.1
10
100
1000
0
10
CAPACITIVE LOAD - nF
30
40
50
INPUT OVERDRIVE - mV
TS9001-2 Propagation Delay (tPD-) vs Pullup Resistance
TS9001-1 Propagation Delay (tPD+) vs Input Overdrive
100
15
VCC =+5V
90
14
80
70
VCC =+3V
VCC =+5V
13
60
tPD- - µs
tPD+ - µs
20
50
40
VCC =+3V
12
11
30
VCC =+1.8V
20
10
VCC =+1.8V
10
0
9
0
20
10
30
40
50
10
INPUT OVERDRIVE - mV
100
1k
10k
RPULLUP - kΩ
Propagation Delay (tPD-) at VCC = +5V
TS9001-2 Propagation Delay (tPD+) vs Pullup Resistance
200
INPUT
180
160
VCC =+1.8V
100
80
VCC =+3V
60
VCC =+5V
40
OUTPUT
tPD+ - µs
140
120
20
0
10
100
RPULLUP - kΩ
TS9001 Rev. 1.0
1k
100k
20µs/DIV
Page 7
TS9001
TYPICAL PERFORMANCE CHARACTERISTICS
VCC = +5V; VEE = 0V; CL = 15pF; VOVERDRIVE = 100mV; TA = +25°C, unless otherwise noted.
Propagation Delay (tPD-) at VCC = +3V
OUTPUT
OUTPUT
INPUT
INPUT
TS9001-1
Propagation Delay (tPD+) at VCC = +5V
20µs/DIV
TS9001-1
Propagation Delay (tPD+) at VCC = +3V
Propagation Delay (tPD-) at VCC = +1.8V
OUTPUT
OUTPUT
INPUT
INPUT
20µs/DIV
20µs/DIV
20µs/DIV
TS9001-1
Propagation Delay (tPD+) at VCC = +1.8V
TS9001-1
10kHz Transient Response at VCC = +1.8V
OUTPUT
OUTPUT
INPUT
INPUT
SUPPLY VOLTAGE - Volt
20µs/DIV
Page 8
20µs/DIV
TS9001 Rev. 1.0
TS9001
TYPICAL PERFORMANCE CHARACTERISTICS
VCC = +5V; VEE = 0V; CL = 15pF; VOVERDRIVE = 100mV; TA = +25°C, unless otherwise noted.
TS9001-1
1kHz Transient Response at VCC = +5V
INPUT
OUTPUT
INPUT
OUTPUT
200µs/DIV
TS9001 Rev. 1.0
Power-Up/Power-Down Transient Response
0.2s/DIV
Page 9
TS9001
PIN FUNCTIONS
TS9001-1
TS9001-2
SC70-5
1
2
3
4
—
5
—
NAME
OUT
VEE
IN+
REF/INREF
VCC
IN-
FUNCTION
Comparator Output
Negative Supply Voltage
Comparator Noninverting Input
1.252V Reference Output/Comparator Inverting Input
1.252V Reference Output
Positive Supply Voltage
Comparator Inverting Input
BLOCK DIAGRAMS
DESCRIPTION OF OPERATION
Guaranteed to operate from +1.6V supplies, the
TS9001-1 and the TS9001-2 analog comparators
only draw 600nA supply current, feature a robust
input stage that can tolerate input voltages 200mV
beyond the power supply rails, and include an onboard +1.252V ±1% voltage reference. To insure
clean output switching behavior, both analog
comparators feature 4mV internal hysteresis. The
TS9001-1’s push-pull output drivers were designed
to minimize supply-current surges while driving
±5mA loads with rail-to-rail output swings. The opendrain output stage TS9001-2 can be connected to
supply voltages above VCC to an absolute maximum
of 6V above VEE. Where wired-OR logic connections
are needed, their open-drain output stages make it
easy to use this analog comparator.
Page 10
Input Stage Circuitry
The robust design of the analog comparators’ input
stage can accommodate any differential input
voltage from VEE - 0.2V to VCC + 0.2V. Input bias
currents are typically ±0.15nA so long as the applied
input voltage remains between the supply rails. ESD
protection diodes - connected internally to the supply
rails - protect comparator inputs against overvoltage
conditions. However, if the applied input voltage
exceeds either or both supply rails, an increase in
input current can occur when these ESD protection
diodes start to conduct.
TS9001 Rev. 1.0
TS9001
Output Stage Circuitry
Many conventional analog comparators can draw
orders of magnitude higher supply current when
switching. Because of this behavior, additional
power supply bypass capacitance may be required
to provide additional charge storage during
switching. The design of the TS9001-1’s rail-to-rail
output stage implements a technique that virtually
eliminates supply-current surges when output
transitions occur. The supply-current change as a
function of output transition frequency exhibited by
these analog comparators is very small. Material
benefits of this attribute to battery-power
applications are the increase in operating time and
in reducing the size of power-supply filter capacitors.
Figure 1: TS9001’s Internal VREF Output
Equivalent Circuit
Internal Voltage Reference
The TS9001-1/2’s internal +1.252V voltage
reference exhibits a typical temperature coefficient
of 40ppm/°C over the full -40°C to +85°C
temperature range. An equivalent circuit for the
reference section is illustrated in Figure 1. Since the
output impedance of the voltage reference Is
typically 200kΩ, its output can be bypassed with a
low-leakage capacitor and is stable for any
capacitive load.
An external buffer – such as the TS1001 – can be
used to buffer the voltage reference output for higher
output current drive or to reduce reference output
impedance.
APPLICATIONS INFORMATION
Low-Voltage, Low-Power Operation
Because they were designed specifically for lowpower, battery-operated applications, the TS90011/2 comparators are an excellent choice. Under
nominal conditions, approximate operating times for
this analog comparator family is illustrated in Table 1
for a number of battery types and their
corresponding charge capacities.
Internal Hysteresis
As a result of circuit noise or unintended parasitic
feedback, many analog comparators often break into
oscillation within their linear region of operation
especially when the applied differential input voltage
approaches 0V (zero volt). Externally-introduced
hysteresis is a well-established technique to
stabilizing analog comparator behavior and requires
external components. As shown in Figure 2, adding
comparator hysteresis creates two trip points: VTHR
(for the rising input voltage) and VTHF (for the falling
input voltage). The hysteresis band (VHB) is defined
as the voltage difference between the two trip points.
When a comparator’s input voltages are equal,
hysteresis effectively forces one comparator input to
move quickly past the other input, moving the input
Table 1: Battery Applications using the TS9001
Alkaline (2 Cells)
No
VFRESH
(V)
3.0
1.8
CAPACITY, AA
SIZE (mA-h)
2000
Nickel-Cadmium (2 Cells)
Yes
2.4
1.8
750
937,500
Lithium-Ion (1 Cell)
Nickel-Metal- Hydride
(2 Cells)
Yes
3.5
2.7
1000
1.25 x 106
Yes
2.4
1.8
1000
1.25 x 106
BATTERY TYPE
TS9001 Rev. 1.0
RECHARGEABLE
VEND-OF-LIFE (V)
TS9001 OPERATING
TIME (hrs)
2.5 x 106
Page 11
TS9001
out of the region where oscillation occurs. Figure 2
illustrates the case in which an IN- input is a fixed
voltage and an IN+ is varied. If the input signals
were reversed, the figure would be the same with an
inverted output. To save cost and external pcb area,
an internal 4mV hysteresis circuit was added to the
TS9001-1/2.
point is (VREF - VOUT)/R2.
In solving for R2, there are two formulas –
one each for the two possible output states:
R2 = VREF/IR2
or
R2 = (VCC - VREF)/IR2
From the results of the two formulae, the
smaller of the two resulting resistor values is
chosen. For example, when using the
TS9001-1 (VREF = 1.252V) at a VCC = 3.3V
and if IR2 = 0.2μA is chosen, then the
formulae above produce two resistor values:
6.26MΩ and 10.24MΩ - the 6.2MΩ standard
value for R2 is selected.
Figure 2: TS9001 Threshold Hysteresis Band
Adding Hysteresis to the TS9001-1 Push-pull
Output Option
2)
Next, the desired hysteresis band (VHYSB) is
set. In this example, VHYSB is set to 100mV.
3)
Resistor R1 is calculated according to the
following equation:
The TS9001-1 exhibits an internal hysteresis band
(VHYSB) of 4mV. Additional hysteresis can be
R1 = R2 x (VHYSB/VCC)
and substituting the values selected in 1)
and 2) above yields:
R1 = 6.2MΩ x (100mV/3.3V) = 187.88kΩ.
The 187kΩ standard value for R1 is chosen.
Figure 3: Using Three Resistors Introduces
Additional Hysteresis in the TS9001-1.
generated with three external resistors using positive
feedback as shown in Figure 3. Unfortunately, this
method also reduces the hysteresis response time.
The procedure to calculate the resistor values for the
TS9001-1 is as follows:
1)
Setting R2. As the leakage current at the IN
pin is less than 2nA, the current through R2
should be at least 0.2μA to minimize offset
voltage errors caused by the input leakage
current. The current through R2 at the trip
Page 12
4)
The trip point for VIN rising (VTHR) is chosen
such that VTHR > VREF x (R1 + R2)/R2 (VTHF
is the trip point for VIN falling). This is the
threshold voltage at which the comparator
switches its output from low to high as VIN
rises above the trip point. In this example,
VTHR is set to 3V.
5)
With the VTHR from Step 4 above, resistor R3
is then computed as follows:
R3 = 1/[VTHR/(VREF x R1) - (1/R1) - (1/R2)]
R3 = 1/[3V/(1.252V x 187kΩ)
- (1/187kΩ) - (1/6.2MΩ)] = 136.9kΩ
In this example, a 137kΩ, 1% standard
value resistor is selected for R3..
TS9001 Rev. 1.0
TS9001
6) The last step is to verify the trip voltages and
hysteresis band using the standard
resistance values:
where the smaller of the two resulting
resistor values is the best starting value.
For VIN rising:
2) As before, the desired hysteresis band
(VHYSB) is set to 100mV.
VTHR = VREF x R1 [(1/R1) + (1/R2) + (1/R3)]
= 3V
3) Next, resistor R1 is then computed
according to the following equation:
For VIN falling:
VTHF = VTHR - (R1 x VCC/R2) = 2.9V
and Hysteresis Band = VTHR – VTHF = 100mV
Adding Hysteresis to the TS9001-2 Open-Drain
Option
The TS9001-2 has open-drain output and requires
an external pull-up resistor to VCC as shown in
Figure 4. Additional hysteresis can be generated
R1 = (R2 + R4) x (VHYSB/VCC)
4) The trip point for VIN rising (VTHR) is chosen
(again, remember that VTHF is the trip point
for VIN falling). This is the threshold voltage
at which the comparator switches its output
from low to high as VIN rises above the trip
point.
5) With the VTHR from Step 4 above, resistor R3
is computed as follows:
R3 = 1/[VTHR/(VREF x R1) - (1/R1) - (1/R2)]
6) As before, the last step is to verify the trip
voltages and hysteresis band with the
standard resistor values used in the circuit:
For VIN rising:
VTHR = VREF x R1 x (1/R1+1/R2+1/R3)
For VIN falling:
VTHF = VREF x R1 x (1/R1+1/R3+1/(R2+R4))
-(R1/(R2+R4)) x VCC
Figure 4: Using Four Resistors Introduces Additional
Hysteresis in the TS9001-2.
using positive feedback; however, the formulae differ
slightly from those of the push-pull option TS9001-1.
The procedure to calculate the resistor values for the
TS9001-2 is as follows:
1) As in the previous section, resistor R2 is
chosen according to the formulae:
R2 = VREF/0.2µA
or
and Hysteresis Band is given by VTHR - VTHF
PC Board Layout and Power-Supply Bypassing
While power-supply bypass capacitors are not
typically required, it is good engineering practice to
use 0.1uF bypass capacitors close to the device’s
power supply pins when the power supply
impedance is high, the power supply leads are long,
or there is excessive noise on the power supply
traces. To reduce stray capacitance, it is also good
engineering practice to make signal trace lengths as
short as possible. Also recommended are a ground
plane and surface mount resistors and capacitors.
R2 = (VCC - VREF)/0.2μA - R4
TS9001 Rev. 1.0
Page 13
TS9001
PACKAGE OUTLINE DRAWING
5-Pin SC70 Package Outline Drawing
(N.B., Drawings are not to scale)
0.65 TYP.
0.15 - 0.30
5
2
4
1.80 - 2.40
1
2
3
1.30 TYP.
1.80 - 2.20
8º - 12º ALL
SIDE
1
0.800 – 0.925
LEAD FRAME THICKNESS
0.10 - 0.18
0.40 – 0.55
0.15
TYP.
GAUGE PLANE
1.00
MAX
1.15 - 1.35
0.00 - 0.10
0º - 8º
0.10 MAX
0.26 - 0.46
0.275 - 0.575
NOTES:
1
DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
2
DOES NOT INCLUDE INTER-LEAD FLASH OR PROTRUSIONS.
3.
DIE IS FACING UP FOR MOLDING. DIE IS FACING DOWN FOR TRIM/FORM.
4
ALL SPECIFICATION COMPLY TO JEDEC SPEC MO-203 AA
5.
CONTROLLING DIMENSIONS IN MILIMITERS.
6.
ALL SPECIFICATIONS REFER TO JEDEC MO-203 AA
7.
LEAD SPAN/STAND OFF HEIGHT/COPLANARITY ARE CONSIDERED AS SPECIAL CHARACTERISTIC
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