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Analog Devices Inc. LTC3616MPUDD#PBF
- Part No.:
- LTC3616MPUDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3616MPUDD#PBF.pdf
- Description:
- IC REG BUCK ADJ 6A 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,078
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Product details
Overview
LTC3616MPUDD#PBF from Analog Devices (formerly Linear Technology) is a 6A, 4MHz monolithic synchronous step-down DC/DC converter with current-mode control, 2.25V–5.5V input range, ±1% output voltage accuracy, and 100% duty cycle low-dropout operation. It delivers high efficiency up to 95% in portable computing and DDR memory termination applications.
For engineers reviewing the LTC3616MPUDD#PBF datasheet, LTC3616MPUDD#PBF pinout, LTC3616MPUDD#PBF application, or LTC3616MPUDD#PBF equivalent, key selection criteria include its –55°C to 150°C extended temperature grade, programmable slew rate on SW node, selectable Burst Mode/pulse-skipping/forced continuous operation, and internal AVP support for DDR memory supplies.
Technical Context
The LTC3616MPUDD#PBF implements a constant-frequency, current-mode architecture with an internal P-channel high-side switch and N-channel synchronous rectifier. Its error amplifier transconductance is 200µS, and ITH pin voltage range (0.1V–1.05V) directly controls peak inductor current, enabling precise transient response tuning across load and output capacitor variations.
It supports three frequency-setting methods: external RT resistor (300kHz–4MHz), synchronization to external clock (up to 4MHz), or internal 2.25MHz oscillator. The MODE pin selects among four operating modes-Burst Mode (internal/external clamp), pulse-skipping, and forced continuous-with distinct ITH threshold behaviors and sleep-state activation logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 6A continuous - supports point-of-load regulation for high-performance processors and DDR memory rails. |
| Input Voltage Range | 2.25V to 5.5V - compatible with single Li-Ion battery and fixed low-voltage system rails. |
| Switching Frequency | Up to 4MHz - enables use of sub-300nH inductors and compact ceramic output capacitors. |
| Quiescent Current | 75µA in Burst Mode - extends battery life in always-on subsystems without sacrificing regulation. |
| Output Accuracy | ±1% over –55°C to 150°C - ensures stable core voltage under extreme thermal conditions. |
| Duty Cycle | 100% - maintains regulation during brownout or low-VIN conditions critical in portable systems. |
| Package | 24-pin 3mm × 5mm QFN with exposed PGND pad - provides low θJA (38°C/W) for high-power density designs. |
Pinout & Package
The LTC3616MPUDD#PBF is housed in a thermally enhanced 24-lead (3mm × 5mm) plastic QFN package with exposed PGND pad (Pin 25), requiring soldering to PCB for optimal thermal performance and ground integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SRLIM/DDR (1) | Mode configuration & slew control | Tied to SVIN enables DDR mode; resistor-to-ground adjusts SW node slew rate to reduce EMI. |
| RT/SYNC (2) | Oscillator control | Accepts resistor (sets fSW), external clock (synchronization), or SVIN (2.25MHz internal oscillator). |
| SGND (3) | Signal reference ground | Reference for feedback, compensation, and control circuitry; must connect to PGND at single point. |
| PVIN (4,10,11,17) | Power MOSFET source supply | Independent of SVIN; powers P-channel high-side switch; multiple pins reduce IR drop. |
| SW (5,6,7,8,13,14,15,16) | Switch node | Eight parallel pins connect to inductor; minimize trace inductance and switching losses. |
| RUN (19) | Enable control | Logic-high enables regulation; grounded forces shutdown (<1µA IQ). |
| PGOOD (20) | Open-drain status flag | Asserts low when VFB deviates >±7.5% from setpoint; used for power sequencing and fault reporting. |
| MODE (21) | Operating mode selector | Voltage level selects Burst Mode (0V), pulse-skipping (SVIN), or forced continuous (1.1V–0.58×SVIN). |
| VFB (22) | Feedback input | Monitors resistive divider output; referenced to 0.6V internal bandgap (±1% over temp). |
| ITH (23) | Error amplifier output | Controls peak inductor current; 0.45V ≈ zero load; 1.05V ≈ 12A peak; ties to SVIN enables AVP. |
| TRACK/SS (24) | Soft-start & tracking input | Enables internal soft-start (to SVIN), external timing (RC), or supply tracking (e.g., for multi-rail sequencing). |
| PGND (25) | Power ground | Exposed pad; connects to N-channel MOSFET source and CIN/COUT (–) terminals for low-impedance return path. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable slew rate on SW node | Reduces EMI emissions by limiting dV/dt during switching transitions without compromising efficiency. |
| Selectable operating modes | Burst Mode (75µA IQ), pulse-skipping (lower ripple), or forced continuous (no subharmonics) - configurable per system noise and efficiency needs. |
| Active Voltage Positioning (AVP) | Internal compensation via ITH-to-SVIN connection enables dynamic VOUT droop for DDR memory compliance and reduced output capacitance. |
| DDR memory termination support | SRLIM/DDR pin tied to SVIN activates ±3A sinking capability and optimized transient response for DDR2/DDR3 VTT rails. |
| 100% duty cycle operation | Maintains regulation down to VIN ≈ VOUT + RDS(ON) × IOUT - extends runtime in battery-powered systems during voltage sag. |
Applications
| Point-of-Load Regulation | DDR Memory Termination |
|---|---|
Use Scenario: Regulating core voltage for FPGA or ASIC in space-constrained industrial controller. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering 1.2V/6A with tight transient response. Use Value: 95% peak efficiency and 100% duty cycle sustain operation during 2.5V input brownout events. | Use Scenario: Providing matched ±3A sourcing/sinking for DDR3 VTT rail in telecom baseband board. IC Role / Device Role / Timing Role: DDR-optimized buck converter with SRLIM/DDR pin enabled and AVP active. Use Value: Internal AVP reduces required output capacitance by 40% while meeting JEDEC VTT ripple specs. |
| Portable Computer Systems | Handheld Devices |
Use Scenario: Powering GPU voltage rail in ultrabook with Li-Poly battery input (2.7V–4.2V). IC Role / Device Role / Timing Role: High-efficiency step-down converter operating in Burst Mode at light loads. Use Value: 75µA quiescent current extends standby time; programmable fSW allows noise-free operation near RF sections. | Use Scenario: Supplying 1.8V to image sensor and ISP in ruggedized handheld test instrument. IC Role / Device Role / Timing Role: Robust buck regulator with –55°C to 150°C rating and integrated thermal protection. Use Value: Extended temperature grade ensures reliability in uncontrolled ambient environments without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS546D24RQFT | 6A, 2.95–16V input, 0.6–5.5V output; PMBus interface; 3.5mm × 4.5mm QFN-22 | Supports digital telemetry and margining; lacks Burst Mode; higher VIN range | Choose for systems requiring real-time telemetry and programmable fault responses. |
| ISL85415IRZ-T7A | 6A, 3–40V input, 0.6–12V output; 3mm × 4mm QFN-16; no DDR mode or AVP | Wider input range suits 12V intermediate bus; no sinking capability or DDR-specific features | Choose for industrial 24V-input PoL where DDR termination is not required. |
Compared with TPS546D24RQFT and ISL85415IRZ-T7A, the LTC3616MPUDD#PBF uniquely combines ultra-low IQ (75µA), DDR-specific sinking capability, AVP, and –55°C operation - making it optimal for battery-powered, thermally demanding, or memory-interface-critical designs where analog control precision and extended temperature resilience are mandatory.
Availability
LTC3616MPUDD#PBF is available at Aetrix Electronics and suitable for point-of-load regulation, DDR memory termination, portable computer systems, and handheld devices requiring stable component supply across extended temperature ranges.
Supply support for LTC3616MPUDD#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 all Linear-branded ICs including the LTC3616 series.
The LTC3616MPUDD#PBF belongs to Linear's high-efficiency monolithic buck regulator product line, designed specifically for space-constrained, battery-sensitive, and thermally aggressive applications such as portable computing and DDR memory power delivery.
FAQ
What is the operating temperature range of the LTC3616MPUDD#PBF?
The LTC3616MPUDD#PBF is rated for –55°C to 150°C junction temperature, verified and tested across this full range - distinguishing it from commercial-grade variants (E/I/H grades) and enabling deployment in aerospace, automotive under-hood, and industrial edge computing environments where extreme thermal resilience is required. This rating is explicitly confirmed in the order information table on page 2 of the datasheet.
How does the LTC3616MPUDD#PBF achieve 100% duty cycle operation?
The LTC3616MPUDD#PBF achieves 100% duty cycle by maintaining continuous conduction of its internal P-channel high-side MOSFET when input voltage approaches output voltage - eliminating dropout loss. This behavior is intrinsic to its current-mode architecture and gate drive design, allowing regulation down to VIN ≈ VOUT + (RDS(ON)_PCH × IOUT), as documented in the "Dropout Operation" section (page 12) and confirmed by typical performance curves (G32).
Can the LTC3616MPUDD#PBF be used for DDR memory VTT termination?
Yes - the LTC3616MPUDD#PBF supports DDR termination via its SRLIM/DDR pin: tying this pin to SVIN activates DDR mode, enabling ±3A sourcing/sinking capability, optimized transient response, and compatibility with DDR2/DDR3 VTT specifications. This functionality is explicitly detailed in the Features list (page 1), Pin Functions (page 9), and Applications (page 1).
What are the key differences between Burst Mode and forced continuous mode on the LTC3616MPUDD#PBF?
In Burst Mode (MODE = SGND), the LTC3616MPUDD#PBF cycles fully on/off at light loads to minimize IQ (75µA), trading higher output ripple for maximum battery life. In forced continuous mode (MODE = 1.1V–0.58×SVIN), it sustains fixed-frequency switching at all loads - eliminating subharmonics but increasing light-load IQ to ~1.1mA. These distinctions are defined in the Mode Selection section (pages 11–12) and validated in G01–G03 efficiency plots.
Does the LTC3616MPUDD#PBF require external compensation components?
The LTC3616MPUDD#PBF supports both external and internal compensation: connecting ITH to SVIN enables internal compensation and Active Voltage Positioning (AVP), while leaving ITH open allows standard Type II/III RC network design. This flexibility is specified in Note 5 (page 4) and Pin Functions (page 9), and the device's adjustable compensation is highlighted in the Features list as enabling transient optimization across diverse output capacitor types.
LTC3616MPUDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.25V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 6A
- Frequency - Switching:
- 300kHz ~ 4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (3x5)
LTC3616MPUDD#PBF FAQ
1.How can I place an order for LTC3616MPUDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3616MPUDD#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 LTC3616MPUDD#PBF reliable?
The price and inventory of LTC3616MPUDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3616MPUDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3616MPUDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3616MPUDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3616MPUDD#PBF?
LTC3616MPUDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3616MPUDD#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 LTC3616MPUDD#PBF?
For technical support, including LTC3616MPUDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3616MPUDD#PBF requirements.
6.How does Aetrix verify that LTC3616MPUDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3616MPUDD#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 LTC3616MPUDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3616MPUDD#PBF?
All LTC3616MPUDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3616MPUDD#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 LTC3616MPUDD#PBF part is unused and in its original packaging.
Return procedure for LTC3616MPUDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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