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Analog Devices Inc. LT1620CGN#PBF
- Part No.:
- LT1620CGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LT1620CGN#PBF.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,762
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Product details
Overview
LT1620CGN#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), 3.8mA supply current, and level-shifted SENSE output for direct interface with current-mode PWM controllers. It is used in Li-ion, NiMH, and lead-acid battery chargers delivering up to 10A with >96% efficiency.
For engineers reviewing the LT1620CGN#PBF datasheet, LT1620CGN#PBF pinout, LT1620CGN#PBF application, or LT1620CGN#PBF equivalent, key selection criteria include its 32V common-mode capability, programmable PROG input range (VCC – 1.25V to VCC), open-collector MODE flag (LT1620GN only), transconductance of 3500µmho, and compatibility with synchronous buck, SEPIC, and constant-current source topologies.
Technical Context
The LT1620CGN#PBF integrates a wide common-mode current sense amplifier (0V–32V) with three gain-scaled outputs: SENSE (×1, level-shifted), AVG (×10, integration node), and IOUT (transconductance output). Its internal transconductance amplifier compares VPROG against VAVG to sink precise current (typ. 130µA) into a PWM controller's error amp, enabling closed-loop average current control independent of VIN/VOUT variations.
Unlike standard current sense amplifiers, it provides inherent level-shifting to overcome PWM controller common-mode limitations-enabling operation from 0V to 32V output voltage. The LT1620CGN#PBF variant is the 16-pin SSOP package without the PROG2/AVG2/MODE pins found in LT1620GN; thus it lacks end-of-cycle flag functionality but retains full current sensing and regulation capability.
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 in buck, boost, or SEPIC converters without level-shifting circuitry. |
| SENSE Output Offset | ±5mV - translates to ≤±0.5% current error at 100mV sense voltage, critical for precision battery charge termination. |
| VPROG Input Range | VCC – 1.25V to VCC - sets programmable current limit via resistor divider; 0.8V differential yields optimal 80mV sense voltage. |
| Transconductance (gm) | 3500µmho (typ.) - defines IOUT sink current vs. (VAVG – VPROG) error; enables stable servo loop with typical PWM controller error amps. |
| Supply Current (ICC) | 3.8mA (typ.) - supports low-power operation while maintaining fast response; allows use with local 5V LDOs like LTC1435's INTVCC. |
| Operating Temp Range | 0°C to 70°C (Commercial) - validated for industrial-grade charger designs where ambient stays below 70°C. |
| Package Thermal Resistance | θJA = 149°C/W - requires moderate PCB copper area for thermal management at >200mA continuous IOUT sink. |
Pinout & Package
LT1620CGN#PBF is housed in a 16-lead plastic SSOP (GN package), 0.150" narrow body, with exposed pad not connected internally. Pin functions are defined per Linear Technology's official LT1620/LT1621 datasheet Rev. G (1996).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 9, 10, 11, 12, 14, 15, 16 | No Connect (NC) | Internally unconnected; must be left floating or tied to GND per layout best practice to reduce noise coupling. |
| 5 | GND | Ground reference for all analog and power circuits; requires low-impedance connection to system ground plane. |
| 6 | MODE | Not available on LT1620CGN#PBF - this pin is NC; end-of-cycle flag functionality is exclusive to LT1620GN. |
| 7 | IN– | Negative input of current sense amplifier; connects to load side of sense resistor; supports 0V–32V common-mode. |
| 8 | IN+ | Positive input of current sense amplifier; connects to inductor or supply side of sense resistor; same 0V–32V range. |
| 13 | IOUT | Transconductance amplifier output; sinks current into PWM controller error amp to regulate average load current. |
| 14 | AVG | ×10 amplified sense output; serves as integration node for average current control loop; bypass to VCC with 0.1µF. |
| 15 | PROG | Negative input of transconductance amplifier; sets target average current via voltage divider from VCC. |
| 16 | VCC | 5V ±10% supply input; powers internal circuitry; must be decoupled with ≥0.1µF ceramic capacitor close to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range (0V–32V) | Enables direct high-side or low-side current sensing in buck, boost, and SEPIC converters without external level shifters. |
| Level-shifted SENSE output (×1 gain) | Drives PWM controller current sense inputs directly-even when controller ground differs from sense resistor ground. |
| Programmable average current regulation via PROG pin | Supports precise, temperature-stable current limits using simple resistor dividers referenced to VCC. |
| ×10 AVG output for integration-based current control | Provides stable DC current feedback signal for outer control loops, rejecting switching ripple without external filters. |
| 3.8mA supply current at 5V | Minimizes auxiliary power draw in battery-powered or energy-sensitive systems while maintaining full bandwidth performance. |
Applications
| Li-Ion Battery Charger | High-Voltage DC/DC Converter |
|---|---|
Use Scenario: 4-cell (16.8V) Li-ion charger using LTC1435 synchronous buck regulator with 3.2A constant-current phase. IC Role / Device Role / Timing Role: LT1620CGN#PBF senses inductor current, generates level-shifted SENSE signal for LTC1435's current sense input, and regulates average charge current via IOUT sink into LTC1435's ITH pin. Use Value: Enables >96% efficiency and <0.5V dropout at 3A by eliminating need for separate current-sense IC or op-amp level-shifter circuitry. | Use Scenario: 24V input to 32V output SEPIC converter for telecom power supply with precise 2A output current limiting. IC Role / Device Role / Timing Role: LT1620CGN#PBF monitors high-side sense resistor, delivers level-shifted SENSE to controller, and uses AVG feedback to maintain regulated average output current under line/load transients. Use Value: Supports full 32V output range without common-mode violation-unachievable with standard current sense amplifiers limited to <5V common-mode. |
| Programmable Constant-Current Source | Electronic Circuit Breaker |
Use Scenario: Lab-grade 0–1A adjustable current source for LED driver characterization or sensor biasing. IC Role / Device Role / Timing Role: LT1620CGN#PBF controls MOSFET gate via IOUT-driven error amp, with PROG set by DAC or potentiometer to define output current. Use Value: Delivers ±1% current accuracy over temperature due to low VOSSENSE (±5mV) and matched internal resistors-no external calibration needed. | Use Scenario: Overcurrent protection for 5V/10A USB-C PD power delivery port with 2ms fault response. IC Role / Device Role / Timing Role: LT1620CGN#PBF senses shunt voltage, drives comparator threshold via AVG, and triggers shutdown logic when current exceeds 1.6A for >2ms. Use Value: Provides fast, accurate trip point (±3%) without microcontroller intervention-reducing BOM count and firmware 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+ | Single-ended output, 0V–76V common-mode, fixed gain (50V/V), no transconductance IOUT or AVG integration node. | Lacks average current control architecture; suitable only for peak or instantaneous current monitoring-not for closed-loop CC regulation. | Choose MAX4080TASA+ only if level-shifting and integration are unnecessary and ultra-high common-mode (>32V) is required. |
| INA240A1QPWRQ1 | Bi-directional, 80V common-mode, 120kHz bandwidth, integrated 2.5V reference; no PROG-programmable transconductance loop. | Designed for motor control and bidirectional sensing; lacks dedicated IOUT sink and AVG integration node for charger PWM servo. | Select INA240A1QPWRQ1 for automotive AEC-Q100 compliance and bidirectional sensing-but not for legacy Linear-based charger designs requiring IOUT/AVG topology. |
Compared with MAX4080TASA+ and INA240A1QPWRQ1, the LT1620CGN#PBF uniquely combines 32V common-mode operation, level-shifted SENSE output, programmable transconductance control (IOUT), and ×10 integration node (AVG) - making it irreplaceable in existing Linear Technology charger reference designs and high-efficiency constant-current loops requiring analog servo behavior.
Availability
LT1620CGN#PBF is available at Aetrix Electronics and suitable for Li-ion battery chargers, high-voltage DC/DC converters, programmable constant-current sources, and electronic circuit breakers requiring stable component supply and long-term industrial availability.
Supply support for LT1620CGN#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 technical and manufacturing continuity for legacy Linear products including the LT1620 family.
The LT1620 product line was designed specifically for high-accuracy, wide common-mode current sensing in battery charging and switch-mode power supply applications-emphasizing analog control loop integrity over digital configurability.
FAQ
What is the maximum input common-mode voltage supported by the LT1620CGN#PBF?
The LT1620CGN#PBF supports an input common-mode voltage range of 0V to 32V. This specification is confirmed in the Absolute Maximum Ratings table and Electrical Characteristics section of the official datasheet. It allows the device to accurately sense current across high-side or low-side shunts in applications such as 24V-input battery chargers or 32V-output DC/DC converters without external level-shifting circuitry. Operation beyond 32V risks permanent damage.
Does the LT1620CGN#PBF include the end-of-charge flag (MODE) output?
No, the LT1620CGN#PBF does not include functional MODE, PROG2, or AVG2 pins. These features are exclusive to the LT1620GN variant (also in 16-pin SSOP). In the LT1620CGN#PBF, pins 6, 11, and 12 are No Connect (NC), as verified in the Package Description and Pin Function tables of the datasheet. For end-of-cycle detection, designers must select LT1620GN or implement external comparator circuitry.
What is the typical transconductance value of the LT1620CGN#PBF's IOUT amplifier?
The LT1620CGN#PBF has a typical transconductance (gm) of 3500 µmho, with a guaranteed range of 3000–4000 µmho over temperature. This value is specified in the Electrical Characteristics table under "Transconductance Amplifier" and defines how much IOUT sink current results from a given (VAVG – VPROG) error voltage. At 130µA typical IOUT, it enables stable servo control of common PWM controllers like LTC1435 and LT1513.
Can the LT1620CGN#PBF operate with a 3.3V supply instead of 5V?
No-the LT1620CGN#PBF is specified only for VCC = 4.5V to 5.5V. The Absolute Maximum Rating for VCC is –0.3V to +7V, but the Electrical Characteristics (e.g., gm, VOS, ICC) are guaranteed only within the 4.5V–5.5V range. Operating at 3.3V violates the recommended conditions and may cause degraded offset, reduced transconductance, or failure to regulate. Use only a stable 5V ±10% supply as intended.
How is the current limit programmed on the LT1620CGN#PBF?
The current limit is programmed by applying a voltage to the PROG pin, where VPROG sets the target average current via the relationship ILOAD ≈ (VCC – VPROG)/10/RSENSE. Optimal accuracy occurs when (VCC – VPROG) = 0.8V, corresponding to 80mV across the sense resistor. A resistor divider from VCC to GND (e.g., 3kΩ + 15.75kΩ) generates VPROG; the PROG pin must be decoupled to VCC with ≥0.1µF ceramic capacitance per the datasheet layout guidelines.
LT1620CGN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (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:
- 2.8mA
- 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:
- 16-SSOP
LT1620CGN#PBF FAQ
1.How can I place an order for LT1620CGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1620CGN#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 LT1620CGN#PBF reliable?
The price and inventory of LT1620CGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1620CGN#PBF is usually 5 days.
3.What payment methods are accepted for LT1620CGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1620CGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1620CGN#PBF?
LT1620CGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1620CGN#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 LT1620CGN#PBF?
For technical support, including LT1620CGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1620CGN#PBF requirements.
6.How does Aetrix verify that LT1620CGN#PBF is sourced from the original manufacturer or authorized distributors?
All LT1620CGN#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 LT1620CGN#PBF meets industry standards.
7.What is the process for return or replacement of LT1620CGN#PBF?
All LT1620CGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1620CGN#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 LT1620CGN#PBF part is unused and in its original packaging.
Return procedure for LT1620CGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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