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PDF LT6700-2 Data sheet ( Hoja de datos )
| Número de pieza | LT6700-2 | |
| Descripción | (LT6700-x) Micropower / Low Voltage / SOT-23 / Dual Comparator | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LT6700-1/LT6700-2/LT6700-3
Micropower, Low Voltage,
Dual Comparator with
400mV Reference
FEATURES
DESCRIPTIO
■ Internal 400mV Reference
The LT®6700-1/LT6700-2/LT6700-3 combine two
■ Combined Reference Accuracy and Offset
micropower, low voltage comparators with a 400mV
± 1.5% Max at 25°C
reference in a 6-lead SOT-23 or tiny DFN package. Oper-
■ Wide Supply Range: 1.4V to 18V
■ Specified for –40 to 125°C Temperature Range
m■ Low Quiescent Current: 6.5µA Typ at 5V
o■ Internal Hysteresis: 6.5mV Typ
■ Low Input Bias Current: ±10nA Max
.c■ Over-The-Top® Input also Includes Ground
■ Open-Collector Outputs Allows Level Translation
U■ Choice of Input Polarities: LT6700-1/LT6700-2/
LT6700-3
t4■ Available in Low Profile (1mm) SOT-23 (ThinSOTTM)
and 2mm × 3mm DFN Packages
APPLICATIOUS hee■ Battery-Powered System Monitoring
S■ Threshold Detectors
■ Window Comparators
ta■ Relay Driving
■ Optoisolator Driving
a■ Industrial Control Systems
.D■ Handheld Instruments
ating with supplies from 1.4V up to 18V, these devices
draw only 6.5µA typical, making them ideal for low voltage
system monitoring. Hysteresis is included in the com-
parators, easing design requirements to insure stable
output operation.
The comparators each have one input available externally,
the other inputs are connected internally to the reference.
The comparator outputs are open collector and the output
load can be referred to any voltage up to 18V, independent
of supply voltage. The output stage sinking capability is
guaranteed greater than 5mA over temperature.
The three versions of this part differ by the polarity of the
available comparator inputs. The LT6700-1 has one in-
verting input and one noninverting input, making it suit-
able for use as a window comparator. The LT6700-2 has
two inverting inputs and the LT6700-3 has two noninvert-
ing inputs. All versions are offered in commercial,
industrial and automotive temperature ranges.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Over-The-Top is a registered trademark of Linear Technology.
ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners.
TYPICAL APPwLICwATIwO t4U.com+
ALKALINE
www.DataShee 1AACELLS
+
Micropower Battery Monitor
VBATT
1.4V (MIN)
3V (NOM)
1M LT6700-3
+
COMP B
63.4k
–
1M 1M
VBATT > 1.6V
VR = 400mV
REFERENCE
VS
– COMP A
+
261k
VBATT > 2V
0.1µF
6700123 TA01
MONITOR CONSUMES ~10µA
HYSTERESIS IS APPROXIMATELY
2% OF TRIP VOLTAGE
Comparator Thresholds
vs Temperature
406
#1A #2A
404 #1B #2B
RISING INPUT
402
400
398
396 FALLING INPUT
394
TWO TYPICAL PARTS
392 COMP A AND B
390 VS = 5V
–60 –40 –20 0 20 40 60 80 100 120
TEMPERATURE (°C)
6700123 TA02
6700123fc
1 page  
LT6700-1/LT6700-2/LT6700-3
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the temperature range of –40°C ≤ TA ≤ 125°C, unless otherwise specified (Notes 4, 5).
SYMBOL PARAMETER
CONDITIONS
LT6700H
MIN TYP MAX
UNITS
IS Supply Current
No Load Current
VS = 1.4V
VS = 5V
VS = 12V
VS = 18V
● 16.0 µA
● 17.0 µA
● 18.5 µA
● 19.0 µA
Note 1: Absolute Maximum Ratings are those beyond which the life of the
device may be impaired.
Note 2: A heat sink may be required to keep the junction temperature
below the absolute maximum rating when the output is shorted
indefinitely.
Note 3: The inputs are protected by ESD diodes to the ground. If the input
voltage exceeds –0.3V below ground, the input current should be limited
to less than 10mA.
Note 4: The LT6700C-1/-2/-3, and LT6700I-1/-2/-3 are guaranteed
functional over the operating temperature range of – 40°C to 85°C.
The LT6700H-1/-2/-3, is guaranteed functional over the operating
temperature range of –40°C to 125°C.
Note 5: The LT6700C-1/-2/-3, is guaranteed to meet the specified
performance from 0°C to 70°C. The LT6700C-1/-2/-3 are designed,
characterized and expected to meet specified performance
from – 40°C to 85°C but are not tested or QA sampled at these tempera-
tures. The LT6700I-1/-2/-3, is guaranteed to meet specified performance
from –40°C to 85°C. The LT6700H-1/-2/-3, is guaranteed to meet
specified performance from –40°C to 125°C.
Note 6: VTH defines the threshold voltage of the comparators and
combines the effect of offset and reference accuracy.
PI FU CTIO S
VS
LT6700-1
–INB – COMP B
+
OUTB
LT6700-2
–INB –
VS
COMP B
+
OUTB
LT6700-3
+INB +
VS
COMP B
–
OUTB
400mV
REFERENCE
VS
– COMP A
+INA +
OUTA
400mV
REFERENCE
VS
+ COMP A
–INA –
OUTA
400mV
REFERENCE
VS
– COMP A
+INA +
OUTA
GND
6700123 PF01
GND
6700123 PF02
GND
6700123 PF03
OUTA: Open-Collector Output of Comparator Section A.
This pin provides drive for up to 40mA of load current. Off-
state voltage may be as high as 18V above GND, regard-
less of VS used.
GND: Ground. This pin is also the low side return of the
internal 400mV reference.
INA: External Input for Comparator Section A. The voltage
on this pin can range from –0.3V to 18V with respect to
GND regardless of VS used. The input is noninverting for
the LT6700-1 and LT6700-3, and inverting for the
LT6700-2. The other section A comparator input is
internally connected to the 400mV reference.
INB: External Input for Comparator Section B. The voltage
on this pin can range from –0.3V to 18V with respect to
GND regardless of VS used. The input is noninverting for
the LT6700-3, and inverting for the LT6700-1 and
LT6700-2. The other section B comparator input is inter-
nally connected to the 400mV reference.
VS: Comparator Core Supply Voltage. The parts are char-
acterized for operation with 1.4V ≤ VS ≤ 18V with respect
to GND.
OUTB : Open-Collector Output of Comparator Section B.
This pin provides drive for up to 40mA of load current. Off-
state voltage may be as high as 18V above GND,
regardless of VS used.
6700123fc
5
5 Page 
LT6700-1/LT6700-2/LT6700-3
APPLICATIO S I FOR ATIO
states on the 0.22µF “integration” capacitor as it remains
balanced at ≈400mV by feedback through the NOT gate.
The input sense voltage, VIN, is converted to an imbalance
current that the NOT gate duty cycle is continually correct-
ing for, thus the digital waveform at the section A com-
parator output is a PWM representation of VIN with respect
to the 2V “full scale.” In this particular circuit, the PWM
information drives the LED of an optocoupler, allowing the
VIN information to be coupled across a dielectric barrier.
As an additional option to the circuit, the feedback loop can
be broken and a second optocoupler employed to provide
the charge balance management. This configuration al-
lows for clocking the comparator output (externally to this
circuit) and providing synchronous feedback such that a
simple ∆Σ voltage-to-frequency conversion can be formed
if desired. Approximately 11-bit accuracy and noise per-
formance was observed in a one second integration period
for duty factors from 1% to 99%.
3V NOM (IS < 3mA)
10k**
5 • VREF = 2V
Lithium +
COIN CELL
470Ω
0.1µF
22µF
NC7S14
309k*
412k*
VS
+INA OUTA
10k
+
VIN
0V TO 2V
–
309k*
0.22µF††
LT6700-1
–INB OUTB
100k* 100k*
GND
10k
0.1µF
750Ω
1
10k
2
†
6
3V/5V
10k
PWM OUT
6 (OR ∆Σ SENSE)
MOC-207
5
3V/5V
750**
1
MOC-207**
*1% METAL FILM
**DELETE FOR PWM MODE
†CONNECT FOR PWM MODE
††OPTIMIZED FOR 2kHz ∆Σ SAMPLING, fPWM(MAX) ≈ 0.6kHz
6700123 F03
52
∆Σ
SAMPLE
IN
Figure 3. Isolated PWM or ∆Σ Converter
PACKAGE DESCRIPTIO
DCB Package
6-Lead Plastic DFN (2mm × 3mm)
(Reference LTC DWG # 05-08-1715)
0.70 ±0.05
2.00 ±0.10
(2 SIDES)
R = 0.115
TYP
R = 0.05
TYP
4
0.40 ± 0.10
6
3.55 ±0.05
1.65 ±0.05
(2 SIDES)
2.15 ±0.05
PACKAGE
PIN 1 BAR
OUTLINE
TOP MARK
(SEE NOTE 6)
0.25 ± 0.05
0.50 BSC
1.35 ±0.05
(2 SIDES)
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
0.200 REF
3.00 ±0.10 1.65 ± 0.10
(2 SIDES) (2 SIDES)
0.75 ±0.05
0.00 – 0.05
PIN 1 NOTCH
R0.20 OR 0.25
× 45° CHAMFER
31
(DCB6) DFN 0405
0.25 ± 0.05
0.50 BSC
1.35 ±0.10
(2 SIDES)
BOTTOM VIEW—EXPOSED PAD
NOTE:
1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (TBD) 5. EXPOSED PAD SHALL BE SOLDER PLATED
2. DRAWING NOT TO SCALE
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE
3. ALL DIMENSIONS ARE IN MILLIMETERS
TOP AND BOTTOM OF PACKAGE
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
6700123fc
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LT6700-2.PDF ] | |
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