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Analog Devices Inc. LT1620IS8#PBF
- Part No.:
- LT1620IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1620IS8#PBF.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:140
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Product details
Overview
LT1620IS8#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 delivers programmable load current control up to 32V output, features ±5mV input offset at ×1 gain, supports >10A output currents, and enables end-of-charge detection via level-shifted outputs - used in Li-ion, NiMH, and lead-acid charger designs.
For engineers reviewing the LT1620IS8#PBF datasheet, LT1620IS8#PBF pinout, LT1620IS8#PBF application, or LT1620IS8#PBF equivalent, key selection criteria include its 0–32V input common-mode range, 3.8mA supply current, 3500µmho transconductance, and compatibility with current-mode PWM controllers such as LTC1435 in high-efficiency (>96%) charging circuits.
Technical Context
The LT1620IS8#PBF integrates a wide common-mode (0–32V) current sense amplifier with three scaled outputs: SENSE (×1, level-shifted), AVG (×10), and IOUT (transconductance sink). Its internal transconductance amplifier compares VPROG against VAVG to generate a precise 130µA typical sink current at IOUT for closed-loop current mode control.
Unlike standard current sense amplifiers, it provides inherent offset compensation across light-load conditions and supports dual-loop configurations when paired with compatible controllers. The device operates over –40°C to 85°C and requires no external biasing for IN+/IN– inputs within its full common-mode range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Common-Mode Range | 0V to 32V - enables direct sensing across high-side or low-side shunts without level-shifting circuitry |
| Input Offset Voltage (SENSE) | ±5mV max - ensures ≤0.5% current-sense error at 100mV differential input |
| Transconductance (gm) | 3500µmho typical - sets IOUT = gm × (VPROG − VAVG) for stable current loop gain |
| Supply Current (ICC) | 3.8mA max - allows operation from local 5V rails without thermal derating in compact layouts |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade battery management and power supply systems |
| PROG Input Range | VCC − 1.25V to VCC - supports precise current programming with resistor-divider references |
| IOUT Sink Capability | 0.65V saturation at 1mA - ensures reliable interfacing with PWM controller error amps |
Pinout & Package
LT1620IS8#PBF is housed in an 8-lead MSOP (MS8) package with exposed pad for thermal performance (θJA = 250°C/W). Pin functions are validated per Linear Technology's official LT1620 datasheet Rev. F (2002).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (AVG) | ×10 Amplifier Output / Transconductance Amp Positive Input | Integration node for average current control; connects to RC filter for loop stability |
| 2 (PROG) | Transconductance Amp Negative Input | Programs target load current; voltage offset vs. VAVG sets IOUT sink magnitude |
| 3 (VCC) | 5V ±10% Power Supply Input | Supplies all internal circuitry; must be decoupled locally to minimize noise coupling |
| 4 (IN+) | Sense Amplifier Positive Input | Connects to high-potential side of sense resistor; supports 0–32V common-mode |
| 5 (SENSE) | ×1 Level-Shifted Output | Drives PWM controller current-sense input directly; includes built-in offset for zero-current continuity |
| 6 (IOUT) | Transconductance Amplifier Output | Sinks current into PWM controller error amp; unidirectional, no sourcing capability |
| 7 (GND) | Ground Reference | Return path for internal bias and output currents; separate from power ground in layout best practice |
| 8 (IN−) | Sense Amplifier Negative Input | Connects to low-potential side of sense resistor; matched with IN+ for common-mode rejection |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | 0V to 32V enables single-device current sensing in buck, boost, SEPIC, and flyback topologies without auxiliary supplies |
| Level-shifted SENSE output | Provides ×1 gain referenced to VCC - eliminates need for external level translators when driving PWM controller sense inputs |
| Integrated transconductance amplifier | Generates precise 130µA typical IOUT sink for servoing PWM error amps - reduces external component count and loop delay |
| Low input offset voltage | ±5mV max at SENSE ensures <0.5% current measurement error at 100mV sense voltage - critical for tight charge termination |
| Industrial temperature rating | –40°C to +85°C ambient operation - supports deployment in automotive accessory chargers and industrial UPS systems |
Applications
| Lithium-Ion Battery Charger | High-Efficiency Buck Constant Current Source |
|---|---|
Use Scenario: Charging 4-cell Li-ion packs (16.8V float) with constant-current/constant-voltage profile in portable medical devices. IC Role / Device Role / Timing Role: LT1620IS8#PBF regulates average charge current by sinking IOUT into LTC1435 error amp while providing level-shifted SENSE feedback. Use Value: Enables >96% efficiency and only 0.5V dropout at 3.2A, meeting stringent thermal and runtime requirements. | Use Scenario: Driving high-power LEDs in industrial lighting with tightly regulated current despite input voltage variation. IC Role / Device Role / Timing Role: LT1620IS8#PBF acts as precision current regulator core, using PROG voltage to set LED current and AVG for loop integration. Use Value: Delivers ±1% current accuracy over 6–28V input range, eliminating need for digital calibration or trimming. |
| Electronic Circuit Breaker | Input Overcurrent Protection for Dual-Load Systems |
Use Scenario: Protecting 5V/1A USB-C PD power paths against short-circuit faults in embedded gateways. IC Role / Device Role / Timing Role: LT1620IS8#PBF monitors shunt voltage and triggers fast shutdown via IOUT-driven comparator latch when current exceeds 1.6A. Use Value: Achieves 2ms fault response with CDELAY = 1.0µF - faster than microcontroller-based monitoring and immune to firmware hangs. | Use Scenario: Preventing wall-adapter overload in laptop dock chargers supplying both battery and system loads simultaneously. IC Role / Device Role / Timing Role: LT1620IS8#PBF senses total input current and reduces battery charge rate via IOUT feedback to LT1513 controller when combined load exceeds 3A. Use Value: Allows use of lower-cost 3A adapters instead of 6A units - reducing BOM cost and thermal design complexity. |
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+ | Higher 120dB CMRR, but only 0–76V common-mode range; requires external VREF for bidirectional sensing | Preferred for high-voltage industrial motor drives where CMRR dominates accuracy | Select MAX4080TASA+ only if >32V common-mode or bidirectional sensing is required; LT1620IS8#PBF remains optimal for battery charging below 32V |
| INA240A1D | Lower 50µV offset, but fixed 20V/V gain; no programmable PROG interface or IOUT sink output | Better suited for simple current monitoring with ADC interfaces, not closed-loop control | Choose INA240A1D for measurement-only roles; LT1620IS8#PBF is necessary where active current regulation and PWM interfacing are needed |
Compared with MAX4080TASA+ and INA240A1D, LT1620IS8#PBF uniquely combines programmable current regulation, level-shifted PWM-compatible outputs, and integrated transconductance control - making it irreplaceable in analog current-mode battery charger designs requiring <1% regulation accuracy and seamless controller integration.
Availability
LT1620IS8#PBF is available at Aetrix Electronics and suitable for lithium-ion battery chargers, high-efficiency buck converters, electronic circuit breakers, and input overcurrent protection systems requiring stable component supply across extended production lifecycles.
Supply support for LT1620IS8#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 series was developed specifically for high-accuracy, wide common-mode current sensing in analog-controlled battery charging and DC/DC converter systems - emphasizing rail-to-rail operation, low offset, and direct PWM controller interoperability.
FAQ
What is the maximum input common-mode voltage supported by the LT1620IS8#PBF?
The LT1620IS8#PBF supports an input common-mode voltage range of 0V to 32V on its IN+ and IN− pins. This specification is verified across the full –40°C to +85°C operating temperature range and enables direct high-side or low-side current sensing without external level-shifting circuitry. The 32V upper limit is absolute and must not be exceeded to avoid damage or parametric shift in LT1620IS8#PBF operation.
How does the LT1620IS8#PBF interface with a PWM controller's current-sense input?
The LT1620IS8#PBF interfaces via its SENSE pin, which provides a level-shifted, unity-gain output referenced to VCC. This signal drives the current-sense input of PWM controllers like LTC1435 directly, eliminating external op-amps or translators. The SENSE output includes a built-in offset to ensure continuity near zero inductor current - a feature critical for stable LT1620IS8#PBF operation in discontinuous conduction mode.
Can the LT1620IS8#PBF be used for bidirectional current sensing?
No, the LT1620IS8#PBF is designed exclusively for unidirectional current sensing. Its transconductance amplifier sinks current only at IOUT, and its PROG input accepts voltages only from VCC down to VCC − 1.25V. The internal architecture assumes current flow direction from IN+ to IN−, and no specification or functional block supports reverse polarity sensing. For bidirectional applications, consider alternatives such as the INA240 or MAX4080.
What is the typical IOUT sink current of the LT1620IS8#PBF and how is it used?
The LT1620IS8#PBF delivers a typical IOUT sink current of 130µA when VPROG equals VAVG. This current is used to servo the error amplifier output of companion PWM controllers (e.g., LTC1435), enabling analog current-mode loop control without digital intervention. The IOUT pin is unidirectional and cannot source current - its behavior is fully characterized in LT1620IS8#PBF's Electrical Characteristics table under "IOUT Saturation Limit (Sink)".
Does the LT1620IS8#PBF include end-of-charge flag functionality?
No, the LT1620IS8#PBF does not include end-of-charge (EOC) flag functionality. That feature is exclusive to the 16-pin LT1620GN variant, which adds PROG2, AVG2, and MODE pins for comparator-based cycle termination. The LT1620IS8#PBF is the 8-pin MSOP version and omits these pins entirely - confirmed by its pinout diagram, package description, and functional block diagram in the official datasheet.
LT1620IS8#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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1620IS8#PBF FAQ
1.How can I place an order for LT1620IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1620IS8#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 LT1620IS8#PBF reliable?
The price and inventory of LT1620IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1620IS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1620IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1620IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1620IS8#PBF?
LT1620IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1620IS8#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 LT1620IS8#PBF?
For technical support, including LT1620IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1620IS8#PBF requirements.
6.How does Aetrix verify that LT1620IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1620IS8#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 LT1620IS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1620IS8#PBF?
All LT1620IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1620IS8#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 LT1620IS8#PBF part is unused and in its original packaging.
Return procedure for LT1620IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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