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Analog Devices Inc. LT1620CMS8#PBF
- Part No.:
- LT1620CMS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1620CMS8#PBF.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,113
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Product details
Overview
LT1620CMS8#PBF from Analog Devices (formerly Linear Technology) is a rail-to-rail current sense amplifier designed for high-accuracy average current regulation in battery charging and DC/DC converter applications. It features 0V–32V input common-mode range, ±5mV typical input offset at ×1 gain, 3.5mA typical supply current, and supports up to 32V output voltage in Li-ion/NiMH/Pb-acid chargers with >96% efficiency.
For engineers reviewing the LT1620CMS8#PBF datasheet, LT1620CMS8#PBF pinout, LT1620CMS8#PBF application, or LT1620CMS8#PBF equivalent, this device serves as a level-shifted current-sense interface between high-voltage power stages and low-voltage current-mode PWM controllers - critical for precision constant-current battery charging, overcurrent protection, and high-output-voltage buck converters.
Technical Context
The LT1620CMS8#PBF integrates a wide common-mode current sense amplifier (0V–32V), transconductance amplifier (3500 µmho typ), and open-collector end-of-cycle flag (MODE) - though the latter is only available in GN-package variants. Its SENSE output provides unity-gain level-shifted current feedback referenced to VCC, while AVG delivers ×10 gain for average current control loop integration.
It operates with 4.5V–5.5V VCC supply, draws ≤3.8mA active current, and regulates load current via PROG pin voltage (VCC – VPROG = 0.8V nominal). Input bias currents are 270µA (sink) and 5.25mA (source) at IN+/IN–, enabling robust operation across industrial temperature range (–40°C to 85°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCM Range | 0V to 32V - enables direct sensing across high-side sense resistors in 24V+ battery and DC/DC systems without level-shifting circuitry. |
| VOSSENSE | ±5mV max - ensures <±0.6% current sensing error at 80mV sense voltage, critical for tight charge current tolerance in Li-ion applications. |
| gm | 3500 µmho typ - defines transconductance amplifier gain for precise IOUT current sink into PWM controller error amp, supporting stable current-mode loops. |
| ICC | 3.8mA max - low quiescent current allows use in always-on battery management systems without excessive standby drain. |
| Temp Range | –40°C to +85°C - qualified for industrial-grade embedded charger designs, including automotive accessory and telecom power supplies. |
| Package | 8-Lead MSOP (MS8) - compact 3mm × 3mm footprint with exposed pad for thermal performance up to 10A continuous load current. |
Pinout & Package
LT1620CMS8#PBF is housed in an 8-lead MSOP (MS8) package with exposed thermal pad (θJA = 250°C/W), optimized for space-constrained high-current charger PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (AVG) | Sense amplifier ×10 output / Transconductance amp positive input | Integration node for average current control loop; connects to RC filter for ripple rejection and DC current regulation. |
| 2 (PROG) | Transconductance amplifier negative input | Programs target average load current; voltage offset from VCC sets current via (VCC – VPROG)/10 = VID across sense resistor. |
| 3 (VCC) | 5V ±10% power supply input | Must be decoupled locally; powers all internal amplifiers and defines reference for SENSE, AVG, and PROG voltage levels. |
| 4 (IN+) | Sense amplifier positive input | Connects to high-potential side of sense resistor; supports 0V–32V common-mode - usable in high-side or low-side configurations. |
| 5 (SENSE) | Sense amplifier ×1 output (level-shifted) | Drives PWM controller current-sense input directly; inherent –3mV offset ensures zero-current detection without external nulling. |
| 6 (IOUT) | Transconductance amplifier output (sink only) | Sinks current from PWM controller error amp to close current mode loop; typical 130µA sink at regulation point. |
| 7 (GND) | Analog ground reference | Must be star-connected to sense resistor ground; separates analog return from power ground to minimize noise coupling. |
| 8 (IN–) | Sense amplifier negative input | Connects to low-potential side of sense resistor; matched with IN+ for differential measurement under high common-mode stress. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | 0V to 32V - eliminates need for external level shifters when monitoring current in high-voltage battery stacks or industrial DC buses. |
| Level-shifted SENSE output | Unity-gain, VCC-referenced - directly interfaces with standard PWM controller current-sense inputs (e.g., LTC1435, LT3758) without signal conditioning. |
| ×10 AVG output for averaging | 10× gain with 2.5kΩ output impedance - enables simple RC integrator design to reject switching ripple and extract true DC load current. |
| Low input offset voltage | ±5mV max at ×1 gain - ensures <±0.0625% full-scale error at 80mV sense voltage, meeting stringent Li-ion CC/CV charge accuracy requirements. |
| Industrial temperature rating | –40°C to +85°C - validated for deployment in uncontrolled environments such as solar charge controllers, EV auxiliary systems, and industrial UPS. |
Applications
| Li-ion Battery Charger | High-Voltage Buck Converter |
|---|---|
|
Use Scenario: 4-cell (16.8V) lithium-ion battery charger delivering 3.2A constant current until float voltage is reached. IC Role / Device Role / Timing Role: Current sense amplifier providing level-shifted feedback to LTC1435 PWM controller; AVG output enables precise average current regulation independent of input/output voltage variation. Use Value: Enables >96% efficiency and only 0.5V dropout at 3A, with end-of-charge detection via external comparator (in GN variant) or system-level monitoring. |
Use Scenario: 24V input to 12V/5A regulated output buck converter powering industrial sensors and actuators. IC Role / Device Role / Timing Role: High-common-mode current monitor interfacing with current-mode controller (e.g., LT3757); SENSE output drives controller's current-sense pin directly. Use Value: Eliminates isolated amplifiers or shunt-based solutions, reducing BOM count and improving reliability in 24–32V industrial power rails. |
| Constant Current Source | Electronic Circuit Breaker |
|
Use Scenario: Programmable 0–1A LED driver or lab-grade bench current source with remote sense capability. IC Role / Device Role / Timing Role: Precision current regulator using PROG voltage to set output; AVG loop maintains stable DC current despite line/load transients. Use Value: Achieves <±1% current accuracy over temperature and input voltage, with no external op-amps or DACs required. |
Use Scenario: Overcurrent protection for 5V/1A USB-C PD port or FPGA core rail, tripping within 2ms at 3× rated current. IC Role / Device Role / Timing Role: Fast-response current monitor feeding comparator or microcontroller ADC; IOUT and AVG used for adaptive trip threshold scaling. Use Value: Replaces discrete MOSFET + op-amp breakers with single IC, reducing layout area by >40% and eliminating drift-prone passive components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4080TASA+ | Single-ended output, 0V–76V common-mode, fixed 20× gain, no PROG pin or transconductance output. | Lacks programmable current regulation; suited for monitoring-only roles, not closed-loop charger control. | Choose when only high-voltage sense voltage scaling is needed - not for LT1620CMS8#PBF's dual-role (sense + control) functionality. |
| INA240A1D | Bi-directional, 80V common-mode, 20V/V gain, integrated 2.5V reference, no AVG/IOUT pins. | No transconductance output or integration node; requires external op-amp for current-mode loop closure. | Select for bi-directional current sensing (e.g., motor drive regen) but avoid if replacing LT1620CMS8#PBF's native PWM interface and averaging capability. |
Compared with MAX4080TASA+ and INA240A1D, the LT1620CMS8#PBF uniquely combines wide common-mode sensing, level-shifted unity-gain output, ×10 averaging node, and dedicated transconductance output - enabling single-chip current-mode control without external amplifiers or level shifters in high-efficiency battery chargers.
Availability
LT1620CMS8#PBF is available at Aetrix Electronics and suitable for Li-ion battery charging, high-output-voltage DC/DC conversion, and programmable constant-current source applications requiring stable component supply and long-term industrial lifecycle support.
Supply support for LT1620CMS8#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for legacy Linear parts including the LT1620 family.
The LT1620 product line was designed specifically for high-accuracy, high-common-mode current sensing in battery charging systems - emphasizing rail-to-rail operation, low offset, and seamless integration with current-mode PWM controllers.
FAQ
What is the maximum input common-mode voltage supported by the LT1620CMS8#PBF?
The LT1620CMS8#PBF supports an input common-mode voltage range of 0V to 32V. This specification is explicitly confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables of the official datasheet. The 32V upper limit applies to both IN+ and IN– pins simultaneously and enables direct use in 24V industrial systems and multi-cell Li-ion battery chargers without external attenuation or level-shifting circuitry. Operation beyond 32V risks permanent damage.
Does the LT1620CMS8#PBF include an end-of-charge (EOC) flag output?
No, the LT1620CMS8#PBF does not include an end-of-charge (EOC) flag output. That function - implemented via the MODE pin and PROG2/AVG2 circuitry - is exclusive to the 16-pin LT1620GN (SSOP) variant, as clearly stated in the Functional Block Diagram and Applications Information sections. The LT1620CMS8#PBF is the 8-pin MSOP version and omits the comparator and associated pins. System-level EOC detection must be implemented externally when using LT1620CMS8#PBF.
What is the typical supply current consumption of the LT1620CMS8#PBF?
The LT1620CMS8#PBF draws a typical DC active supply current (ICC) of 3.3mA under standard operating conditions (VCC = 5V, IN+ – IN– = 100mV), with a maximum of 3.8mA across temperature and process variation. This value is documented in the Electrical Characteristics table for the MS8 package. The low ICC enables efficient operation in always-on battery management subsystems without compromising sensing accuracy or response time.
Can the LT1620CMS8#PBF be used with a 3.3V supply instead of 5V?
No, the LT1620CMS8#PBF requires a 4.5V to 5.5V VCC supply and is not specified for 3.3V operation. The Absolute Maximum Ratings define minimum VCC as –0.3V and maximum as 7V, but the Electrical Characteristics (e.g., ICC, VOS, gm) are only guaranteed across 4.5V–5.5V. Operating below 4.5V may cause degraded offset, reduced transconductance, or failure to regulate - as confirmed by the "Supply" parameter table and Figure 5e showing VCC-dependent programming offsets.
How is load current programmed on the LT1620CMS8#PBF?
Load current is programmed on the LT1620CMS8#PBF by applying a voltage to the PROG pin relative to VCC. The target differential sense voltage (VID) is calculated as (VCC – VPROG)/10; for example, setting VPROG = 4.2V with VCC = 5.0V yields VID = 80mV. Combined with the sense resistor value (RSENSE = VID / ILOAD), this establishes precise average current regulation. This method is validated in the "Charge Current Programming" section and Figure 2 schematic, where RP1/RP2 resistor dividers set VPROG.
LT1620CMS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- -
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- -
- Current - Input Bias:
- 20 nA
- Voltage - Input Offset:
- 6 mV
- Current - Supply:
- 2.3mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LT1620CMS8#PBF FAQ
1.How can I place an order for LT1620CMS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1620CMS8#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LT1620CMS8#PBF reliable?
The price and inventory of LT1620CMS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1620CMS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1620CMS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1620CMS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1620CMS8#PBF?
LT1620CMS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1620CMS8#PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LT1620CMS8#PBF?
For technical support, including LT1620CMS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1620CMS8#PBF requirements.
6.How does Aetrix verify that LT1620CMS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1620CMS8#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LT1620CMS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1620CMS8#PBF?
All LT1620CMS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1620CMS8#PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LT1620CMS8#PBF part is unused and in its original packaging.
Return procedure for LT1620CMS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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