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Analog Devices Inc. LT1620CS8#PBF
- Part No.:
- LT1620CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1620CS8#PBF.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:195
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Product details
Overview
LT1620CS8#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 input offset (SENSE output), 3.8mA supply current at 5V, and level-shifted SENSE output for direct interface with current-mode PWM controllers. It enables >96% efficient Li-ion chargers up to 32V output.
For engineers reviewing the LT1620CS8#PBF datasheet, LT1620CS8#PBF pinout, LT1620CS8#PBF application, or LT1620CS8#PBF equivalent, key selection criteria include its 32V common-mode sensing capability, PROG-pin programmable current control, IOUT transconductance sink output (130µA typical), and compatibility with synchronous buck controllers like LTC1435 in constant-current battery charge loops.
Technical Context
The LT1620CS8#PBF integrates a wide common-mode current sense amplifier (0V–32V) with three scaled outputs: SENSE (×1, level-shifted), AVG (×10), and AVG2 (×20, not available in SO-8). Its transconductance amplifier compares VAVG against VPROG to generate a precise IOUT sink current that servo-controls the external PWM controller's error amplifier.
It supports dual-loop operation via separate PROG and PROG2 inputs - PROG sets average load current (e.g., 3.2A at 80mV across RSENSE), while PROG2 (in GN package only) enables end-of-charge flag generation. The SO-8 variant (LT1620CS8#PBF) omits PROG2, MODE, AVG2, and second IN+/IN– pair, retaining only core current-sense and regulation functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Common-Mode Range | 0V to 32V - enables direct sensing on high-side of battery or input rail without level-shifting circuitry |
| SENSE Output Offset | ±5 mV - ensures <±0.5% current sense error at 1A with 0.025Ω shunt |
| VCC Supply Range | 4.5V to 5.5V - compatible with standard 5V regulator rails; no external bias required |
| IOUT Sink Current | 130 µA typical - matches typical error amp source capability of LTC1435, minimizing programming voltage offset |
| Transconductance (gm) | 3.5 m℧ typical - defines IOUT vs (VPROG − VAVG) gain for stable current loop compensation |
| Supply Current (ICC) | 3.8 mA at 5V - low quiescent draw supports high-efficiency designs where standby loss matters |
| Differential Input Range (VID) | 0–125 mV - optimized for precision shunt voltages; 80mV nominal for best accuracy |
Pinout & Package
LT1620CS8#PBF is housed in an 8-lead plastic SO (S8) package with 1.27mm lead pitch, JEDEC MS-012AC compliant, θJA = 120°C/W. Pin 1 marked by beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (AVG) | Sense amplifier ×10 output / Transconductor positive input | Integration node for average current control; connects to RC filter for loop stability |
| 2 (PROG) | Transconductor negative input | Programs target average load current; voltage relative to VCC sets IOUT sink magnitude |
| 3 (VCC) | 5V power supply input | Must be decoupled locally; powers all internal amplifiers and bias circuits |
| 4 (IN+) | Sense amplifier non-inverting input | Connects to high-potential side of current sense resistor; supports 0–32V common mode |
| 5 (SENSE) | Sense amplifier ×1 level-shifted output | Drives PWM controller current sense input directly; offset ensures zero-current detection |
| 6 (IOUT) | Transconductor output (current sink) | Sinks current from PWM error amp; closes current regulation loop without external op-amp |
| 7 (GND) | Analog ground reference | Must tie to power ground near sense resistor; separates analog return from noisy power paths |
| 8 (IN−) | Sense amplifier inverting input | Connects to low-potential side of current sense resistor; completes differential measurement path |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range (0V–32V) | Enables high-side current sensing in buck, boost, and SEPIC chargers without auxiliary supplies or level shifters |
| Level-shifted SENSE output referenced to VCC | Eliminates need for external level translation when interfacing with PWM controllers whose sense inputs are referenced to local ground |
| PROG-pin programmable average current | Allows precise, temperature-stable current setting via simple resistor divider - no DAC or microcontroller required |
| 130µA typical IOUT sink current | Matches common error amplifier source capability (e.g., LTC1435), minimizing VPROG offset and simplifying loop compensation |
| Low 5mV input offset (SENSE output) | Supports accurate current regulation down to ~200mA with 0.025Ω shunt, critical for end-of-charge taper control |
Applications
| Li-Ion Battery Charger | High-Efficiency Buck Constant Current Source |
|---|---|
Use Scenario: 4-cell (16.8V) Li-ion charger delivering 3.2A constant current until float voltage reached, then transitioning to CV mode. IC Role / Device Role / Timing Role: Current sense amplifier and transconductance regulator that replaces discrete op-amp + transistor current sink; provides closed-loop average current control independent of VIN/VBATT variation. Use Value: Enables >96% efficiency and only 0.5V dropout at 3A using LTC1435 synchronous buck, with no additional 5V supply needed for the LT1620CS8#PBF. | Use Scenario: Programmable LED driver or lab-grade constant-current source delivering 0–1A into variable loads with <1% setpoint error. IC Role / Device Role / Timing Role: Precision current regulator that converts PROG voltage into proportional IOUT sink, enabling direct control of PWM controller duty cycle via its error amplifier. Use Value: Achieves stable DC current regulation without output capacitor dependency or ripple injection; supports fast transient response due to direct current-mode feedback. |
| Electronic Circuit Breaker | Input Overcurrent Protection for Dual-Load Systems |
Use Scenario: 5V/1A protected supply tripping within 2ms at 3A fault, with adjustable delay via CDELAY. IC Role / Device Role / Timing Role: High-speed current monitor whose IOUT drives external MOSFET gate via NPN buffer; AVG output used for hysteresis and trip threshold setting. Use Value: Provides sub-10ms fault response with no microcontroller, supporting Class 2 limited-power source compliance and safe thermal shutdown. | Use Scenario: Wall-adapter-powered system simultaneously charging battery and powering active load; prevents adapter overload by throttling charge current when total input exceeds 3A. IC Role / Device Role / Timing Role: Input current sensor placed upstream of charger IC (e.g., LT1513); regulates VIN current by modulating IOUT to reduce charger duty cycle. Use Value: Allows use of lower-cost, lower-rated adapters while maintaining full functionality - eliminates need for oversized AC/DC supply or complex power management ICs. |
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+ | Bi-directional sensing, 0–76V common mode, 100kHz bandwidth, fixed gain (50V/V), no PROG/IOUT interface | Requires external op-amp and DAC for programmable current control; suited for monitoring, not closed-loop regulation | Select when bidirectional current measurement or higher voltage range is required, but avoid if direct PWM loop integration is needed. |
| INA240A1D | Unidirectional, 0–80V common mode, 120kHz bandwidth, fixed gain (20V/V), no transconductance output or PROG pin | Lacks integrated current regulation loop; requires external error amplifier and current sink for closed-loop control | Choose for high-voltage industrial current monitoring where simplicity and AEC-Q100 qualification matter more than autonomous regulation. |
Compared with MAX4080TASA+ and INA240A1D, the LT1620CS8#PBF uniquely integrates a programmable transconductance amplifier and level-shifted output, enabling self-contained current-mode control without external components - essential for compact, high-efficiency battery charger designs.
Availability
LT1620CS8#PBF is available at Aetrix Electronics and suitable for high-efficiency Li-ion battery chargers, programmable constant-current sources, electronic circuit breakers, and input overcurrent protection systems requiring stable component supply and long-term industrial availability.
Supply support for LT1620CS8#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 LT1620CS8#PBF belongs to Linear's precision current sense amplifier product line, engineered specifically for high-accuracy, high-common-mode battery charging and DC/DC converter current regulation - emphasizing rail-to-rail operation, low offset, and seamless PWM controller integration.
FAQ
What is the maximum input common-mode voltage supported by the LT1620CS8#PBF?
The LT1620CS8#PBF supports an input common-mode voltage range of 0V to 32V. This allows direct high-side current sensing in applications such as 24V-input Li-ion chargers or automotive-derived power systems without requiring level-shifting circuitry. The specification is validated across temperature and process corners per the official Linear Technology datasheet Rev. F.
Can the LT1620CS8#PBF be used with PWM controllers other than the LTC1435?
Yes, the LT1620CS8#PBF is compatible with any current-mode PWM controller that accepts a grounded-referenced current sense input and has an error amplifier capable of sourcing ≥130µA. Verified examples include the LT1513 (SEPIC), LT3751 (flyback), and MP24894 (buck). Interface success depends on matching IOUT sink capability to the controller's error amp source strength and ensuring SENSE output swing fits within the controller's sense input range.
Does the LT1620CS8#PBF include an end-of-charge comparator like the LT1620GN?
No, the LT1620CS8#PBF (SO-8 package) does not include the end-of-cycle comparator, MODE output, PROG2 input, or AVG2 output. These features are exclusive to the 16-lead GN (SSOP) package variants (e.g., LT1620CGN). The LT1620CS8#PBF provides only the core current sense amplifier, PROG-programmed transconductance regulator, and IOUT sink - sufficient for constant-current regulation but not autonomous charge termination.
What is the recommended value for the sense resistor (RSENSE) when programming 2.5A output current with the LT1620CS8#PBF?
For optimal accuracy, the LT1620CS8#PBF is designed for 80mV differential input (VID) at full scale. To program 2.5A, use RSENSE = 80mV / 2.5A = 0.032Ω. A 0.033Ω, 1% metal-film resistor is a standard, readily available choice. At 2.5A, it dissipates 0.206W - select a 0.5W or higher rated resistor with low thermal EMF for stability.
How does the LT1620CS8#PBF achieve level-shifted output without external components?
The LT1620CS8#PBF achieves level-shifted SENSE output through internal resistor networks referenced to VCC. The SENSE pin delivers a ×1 replica of (IN+ − IN−) but biased so its quiescent output sits near VCC - enabling direct connection to PWM controllers whose current sense inputs are ground-referenced and cannot tolerate negative voltages. This architecture eliminates external level shifters or op-amps while preserving signal integrity and bandwidth.
LT1620CS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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-SO
LT1620CS8#PBF FAQ
1.How can I place an order for LT1620CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1620CS8#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 LT1620CS8#PBF reliable?
The price and inventory of LT1620CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1620CS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1620CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1620CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1620CS8#PBF?
LT1620CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1620CS8#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 LT1620CS8#PBF?
For technical support, including LT1620CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1620CS8#PBF requirements.
6.How does Aetrix verify that LT1620CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1620CS8#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 LT1620CS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1620CS8#PBF?
All LT1620CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1620CS8#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 LT1620CS8#PBF part is unused and in its original packaging.
Return procedure for LT1620CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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