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Analog Devices Inc. LTC3622EMSE-2#PBF
- Part No.:
- LTC3622EMSE-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3622EMSE-2#PBF.pdf
- Description:
- IC REG BUCK ADJ 1A DL 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:101
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Product details
Overview
LTC3622EMSE-2#PBF from Analog Devices is a dual-channel, 1A synchronous step-down regulator with 2.25MHz fixed switching frequency, ultralow 5µA no-load quiescent current (both channels enabled), ±1% output voltage accuracy, and operation from 2.7V to 17V input. It delivers two independent adjustable outputs (0.6V to VIN) in a compact 16-lead MSOP package and is used in battery-powered handheld scanners requiring high light-load efficiency and low EMI.
For engineers reviewing the LTC3622EMSE-2#PBF datasheet, LTC3622EMSE-2#PBF pinout, LTC3622EMSE-2#PBF application, or LTC3622EMSE-2#PBF equivalent, key selection criteria include dual-channel synchronization capability, phase-shift programmability via PHASE/MODE pins, selectable Burst Mode® vs pulse-skipping operation, and 100% duty-cycle dropout support for wide-input portable systems.
Technical Context
The LTC3622EMSE-2#PBF implements a constant-frequency peak current-mode control architecture with internal compensation, soft-start (500µs), and independent RUN/PGOOD per channel. Its 2.25MHz switching frequency enables use of small external inductors (e.g., 4.7µH) and ceramic capacitors while maintaining stable regulation across 2.7V–17V input and 0.6V–VIN output ranges.
It supports three operational modes via MODE/SYNC pin: Burst Mode® (INTVCC tie) for <4µA single-channel IQ and highest light-load efficiency; pulse-skipping (GND tie) for lowest output ripple; and external clock synchronization (±50% range) with programmable phase shift (0° or 180° via PHASE pin, or edge-controlled 90° with external clock). ILIM pin provides per-channel current limit selection (1.8A full / 0.9A reduced).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 2.25MHz fixed - enables compact 3.3µH/4.7µH inductors and reduces EMI filtering burden |
| Input Voltage Range | 2.7V to 17V - supports single-cell Li-ion up to 12V industrial rails without pre-regulation |
| Output Voltage Range | 0.6V to VIN - allows direct 1.8V, 2.5V, 3.3V, or 5V generation with external resistor divider |
| No-Load Quiescent Current | 5µA (both channels active), <4µA (one channel active) - extends battery life in always-on portable devices |
| Output Voltage Accuracy | ±1% over line/load/temperature - ensures reliable logic-level compliance for microcontrollers and sensors |
| Peak Output Current | 1A per channel - sustains full load on both regulators simultaneously with thermal derating |
| Duty Cycle Range | 0% to 100% - maintains regulation during input dropout (e.g., 3.6V input → 3.3V output) |
| Power Good Accuracy | ±7.5% window, 32-cycle delay - provides robust system reset signaling without false triggers |
Pinout & Package
Package: 16-lead plastic MSOP (3mm × 4.9mm), exposed pad (Pin 17) connected to GND for thermal and electrical performance. Pin count and layout match industry-standard MSOP footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1 (Pin 1) | Channel 1 input supply | Primary power source for Channel 1 and INTVCC LDO; must be ≥2.7V |
| SVIN (Pin 2) | Signal VIN input | Alternative INTVCC source; connect to higher of VIN1/VIN2 via diode if inputs differ |
| PGOOD1 (Pin 3) | Channel 1 power-good indicator | Open-drain output asserting high when VOUT1 is within ±7.5% of target for ≥32 cycles |
| MODE/SYNC (Pin 4) | Mode select & external clock input | Tie to INTVCC for Burst Mode®, GND for pulse-skipping, or apply 0.4V–(INTVCC–0.3V) clock for sync + phase control |
| PHASE (Pin 5) | Inter-channel phase configuration | Tie to GND for 0° (in-phase), INTVCC for 180° (anti-phase); enables ripple cancellation in shared input paths |
| PGOOD2 (Pin 6) | Channel 2 power-good indicator | Independent open-drain status signal for Channel 2 regulation |
| ILIM (Pin 7) | Current limit programming | GND = 1.8A/ch, INTVCC = 0.9A/ch, 1V = 1.8A on Ch1 + 0.9A on Ch2 |
| VIN2 (Pin 8) | Channel 2 input supply | Independent input rail - may differ from VIN1 (e.g., separate battery or supply domain) |
| SW2 (Pin 9) | Channel 2 switch node | Connects to inductor and low-side MOSFET drain; requires tight layout to minimize EMI |
| RUN2 (Pin 10) | Channel 2 enable control | Logic-high (>0.35V) activates regulator; must not float - tie to GND or INTVCC for permanent ON/OFF |
| FB2 (Pin 11) | Channel 2 feedback input | Senses divided output voltage; 10nA bias current enables high-value resistor dividers (e.g., 1MΩ/1.21MΩ for 3.3V) |
| INTVCC (Pin 12) | Internal LDO output | 3.3V–3.9V regulated supply for internal circuitry; bypass with ≥1µF low-ESR capacitor to GND |
| FB1 (Pin 13) | Channel 1 feedback input | Identical function to FB2; supports independent output programming per channel |
| RUN1 (Pin 14) | Channel 1 enable control | Independent logic-enable input - allows staggered startup or dynamic channel disable |
| SW1 (Pin 16) | Channel 1 switch node | High dv/dt node; requires short, low-inductance path to inductor and input/output caps |
| GND (Pin 17) | Power and signal ground | Exposed thermal pad - must be soldered to PCB ground plane for θJC = 10°C/W and rated performance |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Reduces no-load IQ to 5µA (both channels) - extends shelf life and runtime in battery-critical applications |
| 100% duty-cycle dropout mode | Maintains regulation down to VIN = VOUT with minimal IQ increase - ideal for Li-ion discharge curves |
| Programmable inter-channel phase | 0° or 180° phase shift reduces input capacitor RMS current by up to 30% in dual-output systems |
| External clock synchronization | ±50% sync range allows EMI spreading or alignment with system clocks to avoid sensitive bands |
| Per-channel RUN and PGOOD | Enables independent power sequencing, fault isolation, and system-level health monitoring |
| Internal soft-start (500µs) | Prevents inrush current and output overshoot during startup - eliminates need for external timing components |
Applications
| Handheld Barcode Scanners | Portable Medical Sensors |
|---|---|
Use Scenario: Battery-powered scanner with CMOS image sensor (2.5V), MCU (1.8V), and laser driver (5V) operating from single 3.7V Li-ion cell. IC Role / Device Role / Timing Role: Dual-output DC/DC converter providing isolated, regulated 2.5V and 1.8V rails with synchronized switching to minimize conducted EMI. Use Value: 2.25MHz operation allows 2.2µH inductors and 10µF ceramic output caps; Burst Mode® extends 300mAh battery life to >12 hours standby. |
Use Scenario: Wearable ECG patch requiring ultra-low-noise 3.3V analog front-end and 1.2V digital core, powered by coin cell. IC Role / Device Role / Timing Role: Dual buck regulator delivering precision 3.3V (low-ripple pulse-skipping) and efficient 1.2V (Burst Mode®) from 3.0V–3.6V input. Use Value: <4µA IQ with one channel active preserves coin cell capacity; ±1% VOUT accuracy ensures ADC reference stability across temperature. |
| Industrial IoT Edge Node | Automotive Body Control Module (BCM) |
Use Scenario: Wireless sensor node with LoRa transceiver (3.3V), ARM Cortex-M (1.2V), and EEPROM (5V), operating from 12V vehicle battery via 24V transient protection. IC Role / Device Role / Timing Role: Dual buck controller generating 3.3V and 1.2V from 5.5V–17V intermediate rail, with anti-phase switching to reduce input cap stress. Use Value: 17V max input withstands load-dump transients; 100% duty cycle supports brownout operation during cranking (6.5V input → 3.3V output). |
Use Scenario: BCM sub-system powering CAN transceiver (5V), microcontroller (3.3V), and LED drivers (12V boost derived separately) from 9V–16V battery. IC Role / Device Role / Timing Role: Dual synchronous buck supplying 5V and 3.3V with independent RUN control for sleep/wake sequencing and PGOOD monitoring. Use Value: -40°C to 125°C operating range meets AEC-Q200 ambient requirements; ±7.5% PGOOD window ensures robust reset signaling under load transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65217CIRSLR | Single 3.3V/1.8V fixed-output PMIC; 2.2MHz, 1.2A per channel; integrated LDOs and fuel gauge | Targeted at TI AM335x/AM437x processors; lacks adjustable VOUT and external sync capability | Select when using TI Sitara SoCs and needing integrated power management beyond dual bucks |
| ISL8026IRZ | Dual 3A buck; 600kHz–1.2MHz adjustable fSW; 3.1V–20V input; no Burst Mode®, higher 30µA IQ | Higher current, wider VIN, but lower light-load efficiency and no phase control | Select when >1A per channel or >17V input is required, and EMI-sensitive phase alignment is unnecessary |
Compared with TPS65217CIRSLR and ISL8026IRZ, the LTC3622EMSE-2#PBF offers superior light-load efficiency (5µA vs 30µA), precise phase control for EMI reduction, and fully adjustable outputs - making it optimal for space-constrained, battery-sensitive dual-rail systems where flexibility and quiescent current dominate selection.
Availability
LTC3622EMSE-2#PBF is available at Aetrix Electronics and suitable for battery-powered handheld scanners, portable medical sensors, and industrial IoT edge nodes requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC3622EMSE-2#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The LTC3622EMSE-2#PBF belongs to Analog Devices' Power by Linear™ family of high-efficiency DC/DC converters designed specifically for ultra-low-power, space-constrained portable and battery-operated systems demanding exceptional light-load efficiency and flexible dual-rail generation.
FAQ
What is the switching frequency of the LTC3622EMSE-2#PBF?
The LTC3622EMSE-2#PBF operates at a fixed 2.25MHz switching frequency, enabling compact external components and reduced EMI. This frequency is factory-set for the "-2" variant and cannot be adjusted via resistor or capacitor; however, it supports external clock synchronization within ±50% (1.125MHz to 3.375MHz) on the MODE/SYNC pin.
How does the LTC3622EMSE-2#PBF achieve ultralow quiescent current?
The LTC3622EMSE-2#PBF achieves 5µA no-load IQ (both channels enabled) through Burst Mode® operation, which disables switching entirely during light loads and wakes only when output voltage droops. With only one channel active, IQ drops below 4µA. This behavior is intrinsic to the IC's control architecture and requires no external components to activate.
Can the LTC3622EMSE-2#PBF generate fixed output voltages without external resistors?
No - the LTC3622EMSE-2#PBF is an adjustable-output device requiring external resistor dividers on FB1 and FB2 to set VOUT (0.6V to VIN). Fixed-output variants like LTC3622-23/5 exist, but the LTC3622EMSE-2#PBF specifically uses the adjustable architecture; omitting feedback resistors will result in undefined or unregulated output.
What is the purpose of the SVIN pin on the LTC3622EMSE-2#PBF?
The SVIN pin on the LTC3622EMSE-2#PBF supplies the INTVCC LDO independently from VIN1/VIN2. It must be connected to the higher of VIN1 or VIN2 (e.g., via Schottky diodes) to ensure stable 3.3V–3.9V internal biasing even if one input rail sags - critical for reliable operation in multi-supply systems or during brownouts.
Does the LTC3622EMSE-2#PBF support 100% duty-cycle operation?
Yes - the LTC3622EMSE-2#PBF supports true 100% duty-cycle operation, allowing it to maintain regulation when VIN approaches VOUT (e.g., 3.6V input → 3.3V output). During dropout, it transitions between active and sleep modes to minimize IQ while sustaining output voltage, extending usable battery range in portable applications.
LTC3622EMSE-2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 17V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 17V
- Current - Output:
- 1A
- Frequency - Switching:
- 2.25MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LTC3622EMSE-2#PBF FAQ
1.How can I place an order for LTC3622EMSE-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3622EMSE-2#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 LTC3622EMSE-2#PBF reliable?
The price and inventory of LTC3622EMSE-2#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3622EMSE-2#PBF is usually 5 days.
3.What payment methods are accepted for LTC3622EMSE-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3622EMSE-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3622EMSE-2#PBF?
LTC3622EMSE-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3622EMSE-2#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 LTC3622EMSE-2#PBF?
For technical support, including LTC3622EMSE-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3622EMSE-2#PBF requirements.
6.How does Aetrix verify that LTC3622EMSE-2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3622EMSE-2#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 LTC3622EMSE-2#PBF meets industry standards.
7.What is the process for return or replacement of LTC3622EMSE-2#PBF?
All LTC3622EMSE-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3622EMSE-2#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 LTC3622EMSE-2#PBF part is unused and in its original packaging.
Return procedure for LTC3622EMSE-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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