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Analog Devices Inc. ADP1621ARMZ-R7
- Part No.:
- ADP1621ARMZ-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADP1621ARMZ-R7.pdf
- Description:
- IC REG CTRLR MULT TOP 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,455
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Product details
Overview
ADP1621ARMZ-R7 from Analog Devices is a constant-frequency, current-mode step-up DC-to-DC controller that drives an external n-channel MOSFET to generate regulated output voltages higher than the input-supporting boost, SEPIC, and flyback topologies. It operates from 2.9 V to 5.5 V supply voltage, delivers up to 92% efficiency in lossless sensing mode, features ±1.0% initial FB reference accuracy (1.215 V), and supports programmable switching frequency from 100 kHz to 1.5 MHz. It is used in APD bias supplies and LCD backlighting where high efficiency and low quiescent current are critical.
For engineers reviewing the ADP1621ARMZ-R7 datasheet, ADP1621ARMZ-R7 pinout, ADP1621ARMZ-R7 application, or ADP1621ARMZ-R7 equivalent, key selection considerations include its lossless current sensing capability (up to 30 V switch-node), 10 µA shutdown current, thermal shutdown at ~150°C, soft-start duration of 2048 clock cycles, and compatibility with external slope compensation for stable operation above 50% duty cycle.
Technical Context
The ADP1621ARMZ-R7 implements peak current-mode control using an internal transconductance error amplifier (gm = 300 µS) and a fixed-frequency PWM oscillator whose frequency is set by a single resistor on the FREQ pin. Its current-sense path supports dual configurations: lossless sensing via MOSFET RDS(on) (CS connected to drain, ≤30 V switch-node) or precision resistor-based sensing (CS connected to source), both requiring external slope compensation for stability.
It integrates a 5.4 V shunt regulator on the PIN pin (35 mA capability), undervoltage lockout at 2.5 V (±0.3 V hysteresis), and a dedicated SDSN pin enabling both shutdown control and synchronization to external clocks up to 1.8 MHz. The GATE driver delivers fast rise/fall times (17 ns/13 ns into 3.3 nF) and supports large MOSFETs for >10 A output capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| FB Reference Voltage | 1.215 V ±0.012 V - sets output voltage via resistive divider; enables precise regulation across temperature and line variations. |
| Switching Frequency Range | 100 kHz to 1.5 MHz - set by single resistor on FREQ pin; allows optimization of size, efficiency, and EMI performance. |
| Supply Voltage Range (IN/PIN) | 2.9 V to 5.5 V - powers internal circuitry and gate driver; higher VIN possible with external NPN or resistor. |
| Shutdown Current | <10 µA - minimizes battery drain in portable systems during standby or sleep modes. |
| Current-Sense Input Range | −5 V to +33 V - supports both lossless (drain-connected) and resistor-based (source-connected) sensing configurations. |
| Thermal Shutdown Threshold | ~150°C - protects device under overload or poor thermal conditions; resumes operation after ~140°C cooldown. |
| Soft Start Duration | 2048 oscillator cycles - limits inrush current and prevents output overshoot during startup. |
Pinout & Package
The ADP1621ARMZ-R7 is housed in a 10-lead MSOP package (3 mm × 3 mm, 0.5 mm pitch), lead-free and RoHS-compliant, rated for −40°C to +125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SDSN | Shutdown & Sync Input | Active-low enable/synchronization input with 100 kΩ internal pull-down; accepts external clock up to 1.8 MHz. |
| GND | Analog Ground | Reference node for FB, COMP, FREQ, SDSN; must be separated from PGND in layout to avoid noise coupling. |
| COMP | Error Amplifier Output | Transconductance amplifier output (1.0–2.0 V range); connects to RC compensation network for loop stability. |
| FB | Feedback Input | Monitors output via resistive divider; regulates output by comparing to 1.215 V internal reference. |
| FREQ | Oscillator Control | Connects to ground via resistor to set free-running frequency (100 kHz–1.5 MHz); nominal bias 1.4 V. |
| PGND | Power Ground | Return path for gate driver and current-sense amplifier; must be tied to GND near device for low-impedance path. |
| GATE | MOSFET Driver Output | Drives external n-channel MOSFET gate; output swing equals PIN voltage; fast 17 ns rise / 13 ns fall into 3.3 nF. |
| PIN | Gate Driver Supply | Supplies GATE driver; includes integrated 5.4 V shunt regulator (35 mA max); bypass with ≥0.1 µF capacitor. |
| CS | Current-Sense Input | Positive input of current-sense amplifier; accepts drain (≤30 V) or source (resistor) sensing; requires external RS for slope compensation. |
| IN | IC Core Supply | Powers internal logic and error amplifier; includes 5.4 V shunt regulator (35 mA max); bypass with ≥0.1 µF capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Lossless current sensing | Eliminates sense resistor by measuring MOSFET RDS(on) drop-reduces BOM cost and improves efficiency up to 92%. |
| Programmable oscillator | Single-resistor frequency setting (100 kHz–1.5 MHz) enables design flexibility without changing IC or layout. |
| Synchronization capability | SDSN pin accepts external clock up to 1.8 MHz-enables EMI reduction and multi-rail timing coordination. |
| Integrated shunt regulators | Dual 5.4 V shunt regulators on IN and PIN pins simplify biasing and support high-voltage input configurations. |
| Robust protection suite | Includes thermal shutdown (~150°C), UVLO (2.5 V), current limit, and soft start-ensures reliable startup and fault recovery. |
Applications
| APD Bias Supply | Portable LCD Backlight |
|---|---|
Use Scenario: Provides stable, low-noise, high-voltage bias (e.g., 30–100 V) for avalanche photodiodes in optical sensing modules. IC Role / Device Role / Timing Role: Step-up controller managing boost topology with precise current-mode regulation and low ripple. Use Value: Enables accurate photon detection via tight output voltage regulation (±1.0% FB reference) and minimal load transient deviation. | Use Scenario: Powers white LED strings in handheld devices (e.g., tablets, GPS units) from single-cell Li-ion or 3.3 V rails. IC Role / Device Role / Timing Role: High-efficiency boost controller driving external MOSFET and diode to generate 5–24 V LED supply. Use Value: Delivers 92% efficiency in lossless mode and 10 µA shutdown current-extending battery life while maintaining brightness consistency. |
| Isolated Flyback Converter | SEPIC Power Supply |
Use Scenario: Generates isolated auxiliary rails (e.g., ±12 V, 5 V) in industrial power systems where primary-side regulation is required. IC Role / Device Role / Timing Role: Primary-side controller implementing flyback topology with current-mode feedback referenced to secondary via optocoupler or auxiliary winding. Use Value: Supports wide input range (1 V min) and programmable frequency-facilitating transformer design and EMI compliance across varied loads. | Use Scenario: Supplies regulated output from input voltages that may dip below or exceed the output (e.g., automotive cold-crank or USB-PD applications). IC Role / Device Role / Timing Role: SEPIC topology controller using coupled inductors to maintain regulation during input crossover transitions. Use Value: Maintains continuous conduction mode (CCM) stability with external slope compensation-critical for seamless input/output voltage overlap operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3478MM/NOPB | Fixed-frequency current-mode controller with 2.5 V to 40 V input range; no integrated shunt regulator on PIN; requires external bias for high-VIN operation. | Better suited for wide-input industrial supplies (>12 V), but lacks lossless sensing and has higher shutdown current (60 µA). | Select LM3478MM/NOPB when input exceeds 5.5 V without external pass transistor and board space permits added bias components. |
| TPS40210DRCT | Wide-input (4.5–52 V) current-mode controller with integrated gate driver; supports higher switching frequencies (up to 1 MHz); no lossless sensing-requires external sense resistor. | Preferred for high-input automotive or telecom supplies; less efficient at low input due to mandatory sense resistor losses. | Choose TPS40210DRCT for >12 V inputs where robustness and high-frequency operation outweigh efficiency trade-offs. |
Compared with LM3478MM/NOPB and TPS40210DRCT, the ADP1621ARMZ-R7 uniquely combines lossless current sensing, dual shunt regulators, and sub-10 µA shutdown-making it optimal for compact, battery-sensitive boost and SEPIC designs operating from 2.9–5.5 V rails.
Availability
ADP1621ARMZ-R7 is available at Aetrix Electronics and suitable for APD bias supplies, portable LCD backlighting, isolated flyback converters, and SEPIC power supplies requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.
Supply support for ADP1621ARMZ-R7 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and healthcare markets.
The ADP1621ARMZ-R7 belongs to Analog Devices' power management controller product line, designed specifically for high-efficiency, flexible DC-to-DC conversion in space-constrained and battery-powered applications where low quiescent current and topology versatility are essential.
FAQ
What is the maximum switch-node voltage supported by ADP1621ARMZ-R7 in lossless current-sensing mode?
The ADP1621ARMZ-R7 supports lossless current sensing only when the switch-node voltage (at the MOSFET drain) remains ≤30 V. Exceeding this risks inaccurate current limiting and instability. For higher voltages, the CS pin must be connected to a source-side current-sense resistor per Figure 29 in the datasheet. This limitation is explicitly defined in the Absolute Maximum Ratings and General Description sections of the ADP1621ARMZ-R7 datasheet.
Does ADP1621ARMZ-R7 require an external current-sense resistor for all applications?
No, the ADP1621ARMZ-R7 does not require an external current-sense resistor in lossless mode-where the CS pin connects directly to the MOSFET drain and switch-node voltage stays ≤30 V. In that configuration, it senses current via the MOSFET's RDS(on). However, for switch-node voltages >30 V or when tighter current-limit accuracy is needed, a source-connected sense resistor is mandatory. Both configurations require an external slope-compensation resistor (RS) on the CS pin.
How is the switching frequency programmed on ADP1621ARMZ-R7?
The switching frequency of ADP1621ARMZ-R7 is programmed using a single resistor (RFREQ) connected between the FREQ pin and GND. The nominal FREQ pin voltage is 1.4 V, and frequency scales inversely with RFREQ value-from 100 kHz at 180 kΩ to 1.5 MHz at 10 kΩ-as shown in Figure 15 of the ADP1621ARMZ-R7 datasheet. Frequency tolerance is ±0.06%/°C over temperature.
Can ADP1621ARMZ-R7 operate with input voltages below 2.9 V?
Yes, the ADP1621ARMZ-R7 can operate with power-input voltages as low as 1.0 V in fuel-cell or ultra-low-voltage applications-though its core supply (IN and PIN pins) must still be biased within 2.9 V to 5.5 V, typically using an external NPN transistor or resistor-based regulator. This capability is documented in the General Description and Specifications tables of the ADP1621ARMZ-R7 datasheet.
What protection features are integrated into ADP1621ARMZ-R7?
The ADP1621ARMZ-R7 integrates multiple protection features: undervoltage lockout (UVLO) at 2.5 V (±0.3 V hysteresis), thermal shutdown at ~150°C (with ~10°C hysteresis), current limit via COMP clamp, and soft start over 2048 clock cycles. It also provides 10 µA shutdown current and robust absolute maximum ratings-including CS pin tolerance up to +33 V-ensuring reliability in demanding environments.
ADP1621ARMZ-R7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive, Isolation Capable
- Topology:
- Boost, Flyback, Forward Converter, SEPIC
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 2.9V ~ 5.5V
- Frequency - Switching:
- 100kHz ~ 1.5MHz
- Duty Cycle (Max):
- 97%
- Synchronous Rectifier:
- No
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
ADP1621ARMZ-R7 FAQ
1.How can I place an order for ADP1621ARMZ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP1621ARMZ-R7 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 ADP1621ARMZ-R7 reliable?
The price and inventory of ADP1621ARMZ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADP1621ARMZ-R7 is usually 5 days.
3.What payment methods are accepted for ADP1621ARMZ-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP1621ARMZ-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP1621ARMZ-R7?
ADP1621ARMZ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP1621ARMZ-R7 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 ADP1621ARMZ-R7?
For technical support, including ADP1621ARMZ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP1621ARMZ-R7 requirements.
6.How does Aetrix verify that ADP1621ARMZ-R7 is sourced from the original manufacturer or authorized distributors?
All ADP1621ARMZ-R7 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 ADP1621ARMZ-R7 meets industry standards.
7.What is the process for return or replacement of ADP1621ARMZ-R7?
All ADP1621ARMZ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with ADP1621ARMZ-R7, 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 ADP1621ARMZ-R7 part is unused and in its original packaging.
Return procedure for ADP1621ARMZ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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