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Analog Devices Inc. LTC3600IMSE#TRPBF
- Part No.:
- LTC3600IMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3600IMSE#TRPBF.pdf
- Description:
- IC REG BUCK PROG 1.5A 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,982
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Product details
Overview
LTC3600IMSE#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC regulator with rail-to-rail output voltage programmability via a single external resistor on the ISET pin. It delivers up to 1.5A output current, operates from 4V to 15V input, supports adjustable switching frequency from 200kHz to 4MHz, and achieves up to 96% efficiency in point-of-load power supplies for portable instruments and distributed systems.
For engineers reviewing the LTC3600IMSE#TRPBF datasheet, LTC3600IMSE#TRPBF pinout, LTC3600IMSE#TRPBF application, or LTC3600IMSE#TRPBF equivalent, key selection considerations include its ±1% ISET current accuracy, 30ns minimum on-time, 130ns minimum off-time, constant-on-time architecture for fast transient response, and thermally enhanced 12-lead MSOP package with exposed GND pad.
Technical Context
The LTC3600IMSE#TRPBF implements current-mode control with an internal 50µA precision current source on ISET, enabling unity-gain VOUT programming from 0V to VIN – 0.5V. Its constant-on-time architecture uses an internal one-shot timer and valley-current sensing via the bottom MOSFET's RDS(ON) to regulate inductor current.
Switching frequency is set by an external RT resistor (200kΩ to 10kΩ) or synchronized to an external clock on MODE/SYNC with ±30% lock range. The device supports both continuous conduction mode (CCM) and discontinuous conduction mode (DCM), with DCM enabled by grounding MODE/SYNC and CCM forced by tying it to INTVCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 15V - supports dual Li-ion battery, 5V, and 12V input rails without external LDO pre-regulation. |
| IOUT Max | 1.5A - sufficient for FPGA core rails, microcontroller SoCs, and analog signal chain biasing. |
| fSW Range | 200kHz to 4MHz - enables compact magnetics: e.g., 2.2µH at 1MHz fits 3mm × 3mm footprint. |
| ISET Accuracy | ±1% (49.5µA to 50.5µA) - ensures tight output voltage tolerance independent of VOUT setting. |
| Efficiency | Up to 96% at 12VIN/3.3VOUT/1A - minimizes thermal load in sealed portable enclosures. |
| tON(MIN) | 30ns - supports high step-down ratios (e.g., 12V→1.2V at 1MHz) without dropout at low VIN. |
| Shutdown IQ | 1.5µA - enables ultra-low-power sleep modes in battery-backed instrumentation. |
Pinout & Package
Package: 12-lead plastic MSOP (3mm × 4.1mm) with exposed thermal pad (Pin 13 = GND). θJA = 43°C/W. Exposed pad must be soldered to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ISET (1) | Programmable reference current sink | 50µA source sets VOUT = RSET × 50µA; also enables soft-start via CSET and tracking. |
| ITH (2) | Error amplifier output / compensation node | Voltage controls peak inductor current; tie to INTVCC for internal 100k/50pF compensation. |
| RT (3) | Oscillator frequency programming | Resistor to GND sets fSW; 36.1kΩ yields 1MHz; floating or incorrect value causes frequency drift. |
| PGFB (4) | Power good feedback divider input | Detects VOUT regulation window (0.555V–0.645V); tie to INTVCC to disable PGOOD. |
| RUN (5) | Enable/disable control | >1.55V enables operation; <1V disables switching; <0.4V shuts down entire IC including bias circuits. |
| MODE/SYNC (6) | Operation mode select or sync input | GND = DCM; INTVCC = forced CCM; external clock = synchronization with ±30% lock range. |
| SW (7) | Switch node | Connects to inductor; swings from ~–0.3V to VIN; requires low-inductance layout to minimize EMI. |
| VIN (8) | Main power input | 4V–15V supply; bypass with ≥22µF ceramic capacitor placed adjacent to pin. |
| BOOST (9) | Floating gate drive supply | Drives top N-MOSFET gate; connect bootstrap capacitor between BOOST and SW. |
| INTVCC (10) | Internal 5V LDO output | Powers gate drivers and logic; bypass with ≥1µF ceramic capacitor; max 50mA RMS load. |
| VOUT (11) | Regulated output | Feedback node tied directly to error amp (−) input; equals ISET voltage in closed loop. |
| PGOOD (12) | Open-drain power-good indicator | Pulled low if PGFB outside 7.5% window; includes 20µs blanking to suppress transient glitches. |
| GND (13) | Power and signal ground | Exposed thermal pad; must be soldered to large PCB copper area for thermal dissipation and noise reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Single-resistor VOUT programming | Eliminates feedback divider network - reduces BOM count, layout area, and resistor matching errors. |
| ±1% ISET current accuracy | Ensures output voltage tolerance remains tight across temperature and line variations without trimming. |
| Adjustable 200kHz–4MHz switching | Enables optimization: high fSW for small inductors/capacitors; low fSW for peak efficiency in fixed-frequency apps. |
| Zero-current detection & DCM support | Reduces light-load power loss by disabling bottom FET when inductor current reverses - extends battery life. |
| Integrated 5V INTVCC LDO | Removes need for external bias supply - simplifies design while delivering 50mA for gate drivers and logic. |
Applications
| Voltage Tracking Supplies | Point-of-Load Power Supplies |
|---|---|
Use Scenario: Sequencing multiple rails (e.g., FPGA core, I/O, auxiliary) where VOUT must ramp in sync with a master reference. IC Role / Device Role / Timing Role: LTC3600IMSE#TRPBF acts as a follower regulator, with ISET driven by an external DAC or reference to track master rail voltage. Use Value: Achieves <1% tracking error over temperature using only one external component per rail - no op-amp buffers or precision dividers required. | Use Scenario: Providing clean, regulated 1.2V/1.8V/3.3V power directly adjacent to high-speed processors or ADCs on dense PCBs. IC Role / Device Role / Timing Role: LTC3600IMSE#TRPBF serves as primary buck converter with integrated MOSFETs and fast transient response. Use Value: Delivers 1.5A with <50mV load-step droop (typ.) due to constant-on-time control - avoids undershoot-induced logic errors in real-time systems. |
| Portable Instruments | Distributed Power Systems |
Use Scenario: Battery-powered handheld test equipment requiring long runtime and stable analog front-end biasing. IC Role / Device Role / Timing Role: LTC3600IMSE#TRPBF powers precision op-amps, references, and ADCs from 2-cell Li-ion (6V–8.4V). Use Value: 1.5µA shutdown current and 96% peak efficiency extend battery life; 30ns tON(MIN) maintains regulation during battery sag. | Use Scenario: Telecom or industrial backplanes distributing 12V input to multiple remote modules needing local 3.3V/5V conversion. IC Role / Device Role / Timing Role: LTC3600IMSE#TRPBF functions as isolated local regulator on each daughterboard. Use Value: Synchronizable fSW eliminates beat frequencies between modules; MSOP package allows high-density placement near connectors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54302DDAR | Fixed 500kHz fSW, no ISET programming - uses resistor divider feedback; 3.5V–28V VIN range; 3A output. | Higher VIN capability but lacks single-resistor simplicity and rail-to-rail VOUT range (min 0.6V). | Select when input exceeds 15V or >1.5A output is needed; rework feedback layout required. |
| MP2315GJ-Z | Fixed 650kHz fSW, 4.5V–28V VIN, 1.5A, no ISET pin - uses standard resistor divider; no PGOOD or SYNC. | Lower cost, but no programmable frequency, no tracking capability, and no power-good signaling. | Select for cost-sensitive, non-critical applications where sequencing and diagnostics are not required. |
Compared with TPS54302DDAR and MP2315GJ-Z, the LTC3600IMSE#TRPBF uniquely combines single-resistor VOUT programming, ±1% ISET accuracy, and full 0V–(VIN–0.5V) output range - making it optimal for precision tracking, low-VOUT, and layout-constrained designs where feedback network elimination matters.
Availability
LTC3600IMSE#TRPBF is available at Aetrix Electronics and suitable for voltage tracking supplies, point-of-load power supplies, and portable instrumentation requiring stable component supply, guaranteed long-term availability, and traceable sourcing.
Supply support for LTC3600IMSE#TRPBF 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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3600IMSE#TRPBF belongs to ADI's Power by Linear™ family of monolithic DC/DC regulators, designed specifically for high-efficiency, low-noise, and space-constrained point-of-load applications in industrial, medical, and portable electronics.
FAQ
What is the minimum output voltage achievable with the LTC3600IMSE#TRPBF?
The LTC3600IMSE#TRPBF supports output voltages from 0V up to VIN – 0.5V. At VISET = 0V, the minimum VOUT is typically 10mV (per Electrical Characteristics table), limited by internal offset and residual current. This rail-to-rail capability enables direct biasing of current-sense amplifiers and zero-VOUT standby modes - a feature not found in standard resistor-divider-based buck regulators.
How does the LTC3600IMSE#TRPBF achieve fast load transient response?
The LTC3600IMSE#TRPBF uses constant-on-time current-mode control with valley-current sensing. Its 30ns minimum on-time and 130ns minimum off-time allow rapid duty-cycle adjustment within one or two switching cycles. Combined with the 50µA ISET current source's low impedance, this architecture delivers sub-50mV droop on 1A load steps - verified in Typical Performance Characteristic Figure G08 and G09.
Can the LTC3600IMSE#TRPBF be synchronized to an external clock, and what is the acceptable frequency deviation?
Yes, the LTC3600IMSE#TRPBF accepts an external clock on the MODE/SYNC pin. The internal PLL has a ±30% lock range around the RT-programmed free-running frequency. For example, if RT sets 1MHz, the external clock must be between 700kHz and 1.3MHz. Operation outside this window results in loss of synchronization and return to free-run mode.
What is the role of the exposed pad (Pin 13) on the LTC3600IMSE#TRPBF MSOP package?
The exposed pad (Pin 13) on the LTC3600IMSE#TRPBF is electrically and thermally connected to GND. It must be soldered to a dedicated PCB copper pour tied to system ground. This connection reduces θJA from 43°C/W to ≤30°C/W in typical layouts and provides low-impedance return path for high-frequency switch currents - critical for EMI suppression and thermal reliability.
Does the LTC3600IMSE#TRPBF require external compensation components?
No - the LTC3600IMSE#TRPBF supports both internal and external compensation. Tying ITH to INTVCC enables internal 100kΩ + 50pF compensation, eliminating external parts. For optimized transient response or specific stability margins, external RITH/CITH can be added between ITH and GND - as shown in Typical Application Figure TA01a.
LTC3600IMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Programmable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 15V
- Voltage - Output (Min/Fixed):
- 0V
- Voltage - Output (Max):
- 14.5V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-MSOP-EP
LTC3600IMSE#TRPBF FAQ
1.How can I place an order for LTC3600IMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3600IMSE#TRPBF 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 LTC3600IMSE#TRPBF reliable?
The price and inventory of LTC3600IMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3600IMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3600IMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3600IMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3600IMSE#TRPBF?
LTC3600IMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3600IMSE#TRPBF 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 LTC3600IMSE#TRPBF?
For technical support, including LTC3600IMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3600IMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3600IMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3600IMSE#TRPBF 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 LTC3600IMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3600IMSE#TRPBF?
All LTC3600IMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3600IMSE#TRPBF, 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 LTC3600IMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3600IMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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