Datasheet

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LTC1541/LTC1542

15412fd

, LTC and LT are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

Micropower Op Amp,

Comparator and Reference

Daisy-Chained Control Outputs

The LTC

1541/LTC1542 combine a micropower ampli-

fier, comparator and bandgap reference (LTC1541) in an

8-pin package. The part operates from a single 2.5V to

12.6V or dual ±1.25V to ± 6.3V supply with a typical supply

current of 5µA. Both the op amp and comparator feature

a common mode input voltage range that extends from the

negative supply to within 1.3V of the positive supply. The

op amp output stage swings from rail-to-rail. The

comparator’s inverting input is internally connected to the

reference output (LTC1541).

The reference output voltage is 1.2V ±1% over the

extended temperature range. The output can drive a

bypass capacitor of up to 0.01µF without any oscillations.

It can also source up to 2mA and sink up to 20µA.

The op amp is internally compensated to be unity-gain

stable with typical GBW at 12kHz and slew rate of 8V/ms.

The comparator has ±2.25mV of internal hysteresis to

ensure clean output switching, even with slow moving

input signals.

The LTC1541/LTC1542 are available in MSOP and SO-8

packages. For space-limited applications, the LTC1541/

LTC1542 are available in a 3mm x 3mm low profile

(0.8mm) dual fine-pitch leadless package (DFN).

■

Quiescent Current: 5µA Typ

■

Outputs Swing Rail-to-Rail

■

Low Op Amp Offset Voltage: 700µV Max

■

Reference Output Drives 0.01µF Capacitor

■

Internal 1.2V ±0.4% Reference Output (LTC1541)

■

Low Input Bias Current: 1nA Max

■

Reference Output Can Source Up to 2mA

■

Internal ±2.25mV Comparator Hysteresis

■

Comparator and Op Amp Input Range

Includes Ground

■

Op Amp Capable of Driving Up to 1000pF Load

■

Unity-Gain Stable and 12kHz Bandwidth

■

2.5V to 12.6V Supply Voltage Range

■

Pin Compatible Upgrade for MAX951/MAX953

■

Available in 3mm x 3mm x 0.8mm DFN Package

■

Battery- or Solar-Powered Systems

■

Automotive Keyless Entry

■

Low Frequency, Local Area Alarms/Detectors

■

Infrared Receivers for Remote Controls

■

Smoke Detectors and Safety Sensors

■

GSM Portable Phones

Op Amp V

Distribution,

= 2.5V, SO-8 Package

Total of 839 Units

INPUT OFFSET VOLTAGE (µV)

–600

PERCENT OF UNITS (%)

600

–300

0 300

= 5V

= 0V

1541/42 TA02

–

2N3904

SCR LOAD

2.2µF1N457

LOW BATTERY

OUTPUT HIGH = “ON”

OUTPUT LOW = “OFF”

1.2V INTERNAL

REFERENCE

1541/42 • TA01

–

10k

VN2222

100k

10M

–+

1/2 LTC1541

10k

= 7µA AT V

= 5V

TYPE R

1N457

= 3.6V TO 9V

Pilot Light Flame Detector with Low-Battery Lockout

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATIO

Summary of content (12 pages)

PAGE 1
LTC1541/LTC1542 Micropower Op Amp, Comparator and Reference U FEATURES DESCRIPTIO ■ The LTC®1541/LTC1542 combine a micropower amplifier, comparator and bandgap reference (LTC1541) in an 8-pin package. The part operates from a single 2.5V to 12.6V or dual ±1.25V to ± 6.3V supply with a typical supply current of 5µA. Both the op amp and comparator feature a common mode input voltage range that extends from the negative supply to within 1.3V of the positive supply.
PAGE 2
LTC1541/LTC1542 W W W AXI U U ABSOLUTE RATI GS (Note 1) Supply Voltage ........................................................ 13V Input Voltage .............................................– 0.3V to 13V Output Voltage ...........................................– 0.3V to 13V Output Short-Circuit Duration .......................... Indefinite Storage Temperature Range ................. – 65°C to 150°C (DD Package) ...................................
PAGE 3
LTC1541/LTC1542 ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 5V, VSS = 0V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS 12.6 V Power Supply VCC Supply Voltage Range ICC Supply Current (Note 2) ● 2.5 Commercial Grade Industrial Grade ● ● 10 16 17 µA µA µA (SO-8) Commercial Grade (SO-8) Industrial Grade (SO-8) ● ● 1 1.5 2.
PAGE 4
LTC1541/LTC1542 ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 5V, VSS = 0V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS IB Input Bias Current VCM = 2.5V AVOL Large-Signal Gain AMPOUT = 0.5V to 4.5V, No Load AMPOUT = 0.5V to 4.5V, RLOAD = 100k Commercial Grade Industrial Grade MIN ● ● ● 80 60 38 35 TYP MAX 0.
PAGE 5
LTC1541/LTC1542 ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 3V, VSS = 0V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS PSRR Power Supply Rejection Ratio VCC = 3V to 12V Commercial Grade Industrial Grade MIN TYP ● ● tPD Propagation Delay Overdrive = 10mV Overdrive = 100mV VOH Output High Voltage IOUT = – 2mA ● VOL Output Low Voltage IOUT = 1.
PAGE 6
LTC1541/LTC1542 ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 3V, VSS = 0V, unless otherwise noted. SYMBOL PARAMETER ISOURCE Output Source Current ISINK Output Sink Current en Input Noise Voltage CONDITIONS MIN TYP 0.95 ● 0.6 0.4 mA mA 1.2 0.8 1.8 ● mA mA fO = 0.
PAGE 7
LTC1541/LTC1542 U W TYPICAL PERFOR A CE CHARACTERISTICS Reference Output Voltage vs Temperature 1x106 1.202 VCC = 5V VSS = GND 1 1.199 1.198 1.197 1.196 1x105 0.6 OUTPUT VOLTAGE (mV) 1.200 4 1x10 3 1x10 VCC = 5V VSS = GND RLOAD = 100kΩ 1x102 0.4 –25 0 25 50 75 TEMPERATURE (°C) 100 1x10 125 0 SOURCING CURRENT –0.2 –0.6 –0.8 VSUPPLY = ±1.
PAGE 8
LTC1541/LTC1542 U W TYPICAL PERFOR A CE CHARACTERISTICS 120 0 100 –45 –90 80 PHASE –135 60 –180 40 GAIN –225 20 0 –20 –40 –270 VCC = 5V VSS = GND RLOAD = 100kΩ 10 100 PHASE SHIFT (DEGREES) OPEN-LOOP GAIN (dB) Op Amp Open-Loop Gain and Phase vs Frequency –315 1k 10k FREQUENCY (Hz) 100k –360 1M 1541/42 TPC13 U U U PI FU CTIO S AMPOUT (Pin 1): Op Amp Output. The output can swing from rail-to-rail while driving a capacitive load of up to 1000pF. The output can source and sink 0.
PAGE 9
LTC1541/LTC1542 U W U U APPLICATIO S I FOR ATIO The LTC1541/LTC1542 are a combination of a micropower op amp, comparator and 1.2V ±1% reference (LTC1541) in an 8-pin package. The LTC1541 has the negative input of the comparator internally connected to the reference output. The supply voltage range is from 2.5V to 12.6V for single supply and ±1.25V to ±6.3V for dual supplies. The supply current is a mere 5µA (typical) with a 5V single supply.
PAGE 10
LTC1541/LTC1542 U W U U APPLICATIO S I FOR ATIO 1000 LTC1541 RESISTOR VALUE (kΩ) 8 VCC 100 7 COMPOUT 5V TO 8V 6 REF ×1 10 R1 430Ω – 1 0.1 0.001 0.01 0.1 1 CAPACITOR VALUE (µF) C1 1µF 10 5 COMP COMPIN + + VSS 4 1541/42 F02 Figure 2. Damping Resistance vs Bypass Capacitor Value 1541/42 F03a Figure 3a. Reference Transient Response Test Circuit 8V V+ AMPIN + 2mV/DIV 5V + OP AMP VREF AMPOUT – R2 OUT R1 2ms/DIV 2pF TO 10pF LTC1541 • F03b 1541/42 F04 Figure 4.
PAGE 11
LTC1541/LTC1542 U PACKAGE DESCRIPTIO DD Package 8-Lead Plastic DFN (3mm × 3mm) (Reference LTC DWG # 05-08-1698) R = 0.115 TYP 5 0.38 ± 0.10 8 0.675 ±0.05 1.65 ± 0.10 (2 SIDES) 3.00 ±0.10 (4 SIDES) 3.5 ±0.05 1.65 ±0.05 2.15 ±0.05 (2 SIDES) PACKAGE OUTLINE PIN 1 TOP MARK (DD8) DFN 0203 0.28 ± 0.05 4 0.28 ± 0.05 0.75 ±0.05 0.200 REF 0.50 BSC 2.38 ±0.05 (2 SIDES) 1 0.50 BSC 2.38 ±0.10 (2 SIDES) 0.00 – 0.05 BOTTOM VIEW—EXPOSED PAD NOTE: 1.
PAGE 12
LTC1541/LTC1542 U TYPICAL APPLICATIO S Single Supply Function Generator Negative Reference VCC 3V TO 12V VCC 3V TO 9V 0.1µF 5M 200k 2 2 3 – 8 LTC1542 OP AMP + 5M LT1634-2.5 1 3 VOUT –2.5V – 8 1 LTC1542 OP AMP + 4 R2 500k R1 10M 6 – 5 + LTC1542 COMP 4 R3 5M 7 FREQ ≈ R1 4C • R2 • R3 1541/42 TA04 VSS –3V 1541/42 TA05 Voltage Control Oscillator R1 300k 1M VIN 0V – VCC FREQ ≈ C1 0.047µF 2 3 R2 150k VCC – 8 + R4 5M 1 LTC1542 OP AMP 4 6 LTC1542 COMP 5 1M VC 2.