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Analog Devices Inc. LTC3622IDE-2#PBF
- Part No.:
- LTC3622IDE-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
LTC3622IDE-2#PBF.pdf
- Description:
- IC REG BUCK ADJ 1A DL 14DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,172
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Product details
Overview
LTC3622IDE-2#PBF from Analog Devices is a dual-channel, 1A synchronous step-down DC/DC regulator with fixed 2.25MHz switching frequency, ultralow 5µA no-load quiescent current (both channels enabled), ±1% output voltage accuracy, and operation from 2.7V to 17V input - used in battery-powered portable scanners requiring compact, high-efficiency dual-rail power conversion.
For engineers reviewing the LTC3622IDE-2#PBF datasheet, LTC3622IDE-2#PBF pinout, LTC3622IDE-2#PBF application, or LTC3622IDE-2#PBF equivalent, key selection considerations include its dual 1A outputs with independent RUN control, selectable Burst Mode® vs pulse-skipping operation, 180° phase-shift capability, and support for adjustable or fixed-output configurations without external feedback resistors.
Technical Context
The LTC3622IDE-2#PBF implements a constant-frequency peak-current-mode control architecture with internal compensation, enabling stable regulation across 0.6V–VIN output range and supporting 100% duty-cycle dropout operation. Its dual channels share a single INTVCC LDO powered from VIN1 or SVIN (MSOP only), and feature independent FB inputs, RUN enables, PGOOD indicators, and ILIM-selectable current limits (1.6A/0.8A per channel).
Phase relationship between channels is programmable via the PHASE pin (0° or 180°) or dynamically controlled using external clock edges on MODE/SYNC when PHASE = INTVCC; synchronization range is ±50% of nominal 2.25MHz frequency. Burst Mode® operation delivers 5µA total IQ at light load, while pulse-skipping mode minimizes output ripple at the cost of slightly reduced efficiency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | Fixed 2.25MHz - enables use of small 2.2µH–4.7µH inductors and <10µF ceramic output capacitors for space-constrained designs. |
| Input Voltage Range | 2.7V to 17V - supports wide-input industrial and battery-powered systems including 2-cell Li-ion (up to 8.4V) and 12V rail applications. |
| Output Current per Channel | 1A continuous - sufficient to power dual-core microcontrollers, FPGA I/O banks, or sensor signal chains independently. |
| No-Load Quiescent Current | 5µA with both channels enabled - extends battery life in always-on portable devices such as handheld barcode scanners. |
| Output Voltage Accuracy | ±1% over line, load, and temperature - ensures reliable logic-level compliance for 3.3V/2.5V/1.8V digital rails without post-regulation. |
| Feedback Reference Voltage | 0.6V ±1% - allows precise resistor-divider programming of any VOUT ≥0.6V, or direct connection for fixed-output variants. |
| Current Limit Options | Selectable 1.6A (ILIM = GND) or 0.8A (ILIM = INTVCC) per channel - provides design flexibility for thermal management and inductor sizing. |
Pinout & Package
Package: 14-lead (3mm × 4mm) plastic DFN with exposed pad (Pin 15 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1 (Pin 1) | Channel 1 input supply | Powers Channel 1 switch and supplies INTVCC LDO; must be ≥2.7V and ≤17V. |
| PGOOD1 (Pin 2) | Open-drain status indicator | Asserts low if VOUT1 deviates >7.5% from target; requires external pull-up for logic-level interface. |
| MODE/SYNC (Pin 3) | Mode select & clock sync input | Tie to INTVCC for Burst Mode® (low IQ); tie to GND for pulse-skipping (low ripple); connect to external clock for synchronization. |
| PHASE (Pin 4) | Channel phase control | Tie to GND for 0° (in-phase); tie to INTVCC for 180° (anti-phase) - reduces input ripple and EMI in dual-output systems. |
| PGOOD2 (Pin 5) | Channel 2 status indicator | Independent open-drain output mirroring PGOOD1 behavior for VOUT2 regulation monitoring. |
| ILIM (Pin 6) | Per-channel current limit select | GND = 1.6A/ch; INTVCC = 0.8A/ch; 1V bias sets Ch1=1.6A/Ch2=0.8A - enables asymmetric load handling. |
| VIN2 (Pin 7) | Channel 2 input supply | Independent input rail; may differ from VIN1 - supports dual-input systems like USB + battery hybrid supplies. |
| SW2 (Pin 8) | Channel 2 switch node | Connects to source of internal NMOS and drain of PMOS; requires low-inductance path to inductor and bootstrap capacitor. |
| RUN2 (Pin 9) | Channel 2 enable input | Logic-high (>1.0V) enables Channel 2; must not float - use pull-down resistor if unused. |
| FB2 (Pin 10) | Channel 2 feedback input | Senses divided VOUT2; connects to resistor divider midpoint for adjustable outputs or directly to VOUT for fixed options. |
| INTVCC (Pin 11) | Internal LDO output | 3.6V regulated supply for gate drivers and logic; bypass with ≥1µF low-ESR ceramic capacitor to GND. |
| FB1 (Pin 12) | Channel 1 feedback input | Identical function to FB2; enables independent output voltage programming for each channel. |
| RUN1 (Pin 13) | Channel 1 enable input | Independent logic control for Channel 1; supports staggered startup or power sequencing. |
| SW1 (Pin 14) | Channel 1 switch node | High-frequency switching node; layout critical - minimize loop area with input cap, inductor, and SW trace. |
| GND (Pin 15) | Power and signal ground | Exposed thermal pad; must be solidly connected to PCB ground plane for θJC = 4.4°C/W and EMI control. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 1A synchronous buck regulators | Enables compact dual-rail power delivery (e.g., 3.3V + 1.8V) from single input without discrete controllers or external MOSFETs. |
| Ultralow 5µA no-load IQ (both channels) | Extends runtime in battery-backed applications such as portable medical sensors or IoT edge nodes operating in deep sleep. |
| 180° programmable phase shift | Reduces input capacitor RMS current by ~30% and lowers conducted EMI compared to in-phase operation. |
| Internal soft-start (500µs) | Prevents inrush current during power-up; eliminates need for external timing components in most applications. |
| ±50% external clock synchronization | Allows noise-sensitive systems (e.g., RF receivers) to align switching edges away from critical frequency bands. |
| 100% duty-cycle dropout operation | Maintains regulation down to VIN ≈ VOUT, extending usable battery voltage range in Li-ion systems. |
Applications
| Battery-Powered Handheld Scanners | Industrial Dual-Rail Point-of-Load |
|---|---|
Use Scenario: Portable barcode or RFID scanners powered by 2-cell Li-ion (6–8.4V) requiring isolated 3.3V logic and 1.8V core rails. IC Role / Device Role / Timing Role: Dual synchronous buck regulator providing independent, sequenced, and tightly regulated outputs with minimal board area. Use Value: 5µA quiescent current preserves battery capacity during standby; 2.25MHz switching enables <3mm × 3mm total power stage footprint. |
Use Scenario: Programmable logic controller (PLC) I/O module needing 5V analog sensing and 3.3V digital communication rails from 12V or 24V field supply. IC Role / Device Role / Timing Role: Dual-channel DC/DC converter delivering robust, thermally efficient power with independent RUN control for fault isolation. Use Value: 17V max input withstands industrial transients; 180° phase shift cuts input ripple, reducing bulk capacitance requirements by 40%. |
| Portable Medical Sensors | FPGA Core + I/O Power Management |
Use Scenario: Wearable ECG or pulse oximeter using coin-cell or small LiPo battery, requiring ultra-low-power 3.0V analog front-end and 1.2V digital processing rails. IC Role / Device Role / Timing Role: High-efficiency dual buck regulator with Burst Mode® operation to sustain µA-level system sleep currents. Use Value: 5µA total IQ enables multi-week battery life; ±1% VOUT accuracy ensures ADC reference stability and sensor signal integrity. |
Use Scenario: Edge AI accelerator board with Xilinx Artix-7 FPGA requiring separate 1.0V core and 3.3V I/O supplies from 12V intermediate bus. IC Role / Device Role / Timing Role: Monolithic dual regulator supporting independent soft-start, PGOOD monitoring, and current-limit tuning per rail. Use Value: Selectable 0.8A/1.6A current limits allow optimized inductor selection for thermal derating; internal compensation simplifies layout. |
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 |
|---|---|---|---|
| TPS65270RGET | Fixed 1.2MHz frequency; 2A/1.5A outputs; no Burst Mode®; higher 25µA IQ | Higher output current but less suitable for ultra-low-power battery applications | Choose for higher current needs where efficiency at light load is secondary |
| MP2491DS-LF-Z | Single 2A output; no dual-channel integration; 30µA IQ; 500kHz–2.5MHz adjustable frequency | Requires two ICs to match dual-rail functionality; larger solution size | Choose only if dual-channel integration is not required and board space is not constrained |
Compared with TPS65270RGET and MP2491DS-LF-Z, the LTC3622IDE-2#PBF uniquely combines dual 1A outputs, 2.25MHz fixed frequency, and 5µA quiescent current in a single 3mm × 4mm DFN - making it optimal for space- and power-constrained portable electronics where integrated dual-rail efficiency is critical.
Availability
LTC3622IDE-2#PBF is available at Aetrix Electronics and suitable for battery-powered handheld scanners, industrial dual-rail point-of-load supplies, and portable medical sensors requiring stable component supply with guaranteed long-term availability.
Supply support for LTC3622IDE-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 precision instrumentation, industrial automation, communications, and healthcare markets.
The LTC3622IDE-2#PBF belongs to Analog Devices' Power by Linear™ family of high-efficiency monolithic DC/DC regulators, designed specifically for space-constrained, battery-sensitive applications demanding ultralow quiescent current and dual-output flexibility.
FAQ
What is the switching frequency of the LTC3622IDE-2#PBF?
The LTC3622IDE-2#PBF operates at a fixed 2.25MHz switching frequency, enabling compact magnetics and low-profile ceramic capacitors. This frequency is factory-set and cannot be adjusted via external resistors, though it supports ±50% synchronization to an external clock applied to the MODE/SYNC pin. The 2.25MHz option distinguishes it from the base LTC3622 (1MHz) and LTC3622-23/5 (2.25MHz with fixed 5V/3.3V outputs).
Does the LTC3622IDE-2#PBF support adjustable output voltages?
Yes, the LTC3622IDE-2#PBF supports fully adjustable outputs from 0.6V to VIN on both channels using external resistor dividers connected to FB1 and FB2 pins. Its 0.6V ±1% internal reference enables precise programming - for example, 3.3V is set with R2/R1 = 4.5. Fixed-output variants (e.g., LTC3622-23/5) omit these resistors, but the LTC3622IDE-2#PBF itself requires external feedback for non-fixed VOUT.
How does the LTC3622IDE-2#PBF achieve ultralow quiescent current?
The LTC3622IDE-2#PBF achieves 5µA total quiescent current (both channels enabled) through Burst Mode® operation, which disables switching and places both channels into deep sleep until output voltage droops below regulation. In this state, only bias circuitry remains active. When only one channel is enabled, IQ drops below 4µA. This behavior is activated by tying MODE/SYNC to INTVCC and is confirmed in the datasheet's Typical Performance Characteristics (Figure G07).
Can the two channels of the LTC3622IDE-2#PBF operate with 180° phase shift?
Yes, the LTC3622IDE-2#PBF supports 180° phase shift between channels by tying the PHASE pin (Pin 4) to INTVCC. This anti-phase operation reduces input capacitor RMS current and lowers conducted EMI. Alternatively, with PHASE = INTVCC and an external clock on MODE/SYNC, phase shift can be dynamically controlled via clock edge modulation - enabling 90° or other offsets as shown in Figure F01 of the datasheet.
What package and temperature grade does the LTC3622IDE-2#PBF use?
The LTC3622IDE-2#PBF uses a 14-lead (3mm × 4mm) plastic DFN package with exposed thermal pad (Pin 15 = GND), rated for –40°C to +125°C junction temperature. The "I" grade denotes industrial temperature qualification, and the "#PBF" suffix confirms lead-free, RoHS-compliant finish. This package is identical to the LTC3622EDE-2#PBF but differs from MSOP variants which include SVIN and NC pins.
LTC3622IDE-2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-WFDFN 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:
- 14-DFN (4x3)
LTC3622IDE-2#PBF FAQ
1.How can I place an order for LTC3622IDE-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3622IDE-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 LTC3622IDE-2#PBF reliable?
The price and inventory of LTC3622IDE-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 LTC3622IDE-2#PBF is usually 5 days.
3.What payment methods are accepted for LTC3622IDE-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3622IDE-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3622IDE-2#PBF?
LTC3622IDE-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3622IDE-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 LTC3622IDE-2#PBF?
For technical support, including LTC3622IDE-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3622IDE-2#PBF requirements.
6.How does Aetrix verify that LTC3622IDE-2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3622IDE-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 LTC3622IDE-2#PBF meets industry standards.
7.What is the process for return or replacement of LTC3622IDE-2#PBF?
All LTC3622IDE-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3622IDE-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 LTC3622IDE-2#PBF part is unused and in its original packaging.
Return procedure for LTC3622IDE-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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