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Analog Devices Inc. LTC3600EDD#TRPBF
- Part No.:
- LTC3600EDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC3600EDD#TRPBF.pdf
- Description:
- IC REG BUCK PROG 1.5A 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,176
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Product details
Overview
LTC3600EDD#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC regulator with rail-to-rail output voltage programming 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 LTC3600EDD#TRPBF datasheet, LTC3600EDD#TRPBF pinout, LTC3600EDD#TRPBF application, or LTC3600EDD#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 3mm × 3mm DFN package with exposed GND pad.
Technical Context
The LTC3600EDD#TRPBF implements current-mode control with an internal 50µA precision current source on ISET, enabling unity-gain VOUT regulation where output voltage equals ISET voltage. Its constant-on-time architecture uses an internal one-shot timer and phase-locked loop to maintain stable switching frequency while supporting external synchronization within ±30% of the RT-programmed frequency.
It integrates dual N-channel MOSFETs (200mΩ top / 100mΩ bottom), features programmable discontinuous/continuous mode via MODE/SYNC pin, includes overvoltage/undervoltage protection on PGFB (0.555V–0.645V window), and provides soft-start capability through external capacitor on ISET. Shutdown draws only 1.5µA, and INTVCC regulates internally to 5V ±0.2V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 15V - supports dual Li-ion, 5V, and 12V input rails without external LDO pre-regulation. |
| IOUT Max | 1.5A - sufficient for FPGA core rails, microcontroller SoCs, and analog subsystems in portable equipment. |
| fSW Range | 200kHz to 4MHz - enables use of sub-3mm inductors (e.g., 2.2µH at 1MHz) and reduces output capacitance requirements. |
| ISET Accuracy | ±1% (49.5µA to 50.5µA) - ensures tight output voltage tolerance independent of VOUT level across full 0V to VIN–0.5V range. |
| Efficiency | Up to 96% at 12VIN/2.5VOUT/1A - minimizes thermal stress in compact DFN package with θJA = 55°C/W. |
| tON(MIN) | 30ns - supports high step-down ratios (e.g., 12V→1.2V at 1MHz) without pulse-skipping instability. |
| Shutdown IQ | 1.5µA - enables ultra-low-power system sleep states without external enable circuitry. |
Pinout & Package
Package: 12-lead (3mm × 3mm) plastic DFN with exposed GND pad (Pin 13), rated for –40°C to 125°C junction temperature. 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 source | 50µA sink; sets VOUT = VISET; enables soft-start with external capacitor and tracking with external voltage source. |
| ITH (2) | Error amplifier output & compensation node | 0.3V–2.4V control voltage; determines valley inductor current threshold; supports internal (tie to INTVCC) or external R/C compensation. |
| RT (3) | Frequency programming input | Resistor-to-GND sets fSW from 200kHz–4MHz; tie to INTVCC for fixed 1MHz operation. |
| PGFB (4) | Power good feedback input | Monitors VOUT via resistor divider; asserts PGOOD when 0.555V ≤ VPGFB ≤ 0.645V; tie to INTVCC to disable. |
| RUN (5) | Enable/shutdown control | ≥1.55V enables full operation; <1V disables switching; <0.4V shuts down entire IC including bias circuits. |
| MODE/SYNC (6) | Operation mode select or sync input | Tie to GND for DCM at light load; tie to INTVCC for forced CCM; apply external clock for synchronization. |
| SW (7) | Switch node | Connects to inductor; swings from ~–0.3V to VIN; requires low-inductance layout to minimize EMI and shoot-through risk. |
| VIN (8) | Main power input | 4V–15V supply; requires local 22µF ceramic bypass capacitor placed adjacent to pin. |
| BOOST (9) | Floating gate drive supply | Drives top MOSFET gate; connects to bootstrap capacitor (+) terminal; swings from ~INTVCC–0.3V to VIN+INTVCC. |
| INTVCC (10) | Internal 5V LDO output | Powers gate drivers and control logic; requires ≥1µF low-ESR ceramic capacitor to GND; not intended for external loads. |
| VOUT (11) | Regulated output | Output voltage node and error amp inverting input; directly servoed to ISET voltage; connects to output capacitor and load. |
| PGOOD (12) | Open-drain power-good indicator | Pulled low when VPGFB outside 7.5% regulation window; includes 20µs blanking delay to suppress transient glitches. |
| GND (13) | Power and signal ground | Exposed thermal pad; return path for both power MOSFETs and small-signal circuits; must be solidly soldered to PCB ground plane. |
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 frequency | Enables optimization for size (high fSW) or efficiency (low fSW), and avoids noise-sensitive bands (e.g., AM radio). |
| Constant-on-time architecture | Delivers <10µs load transient response without complex loop compensation - ideal for dynamic digital loads. |
| Thermally enhanced DFN package | 3mm × 3mm footprint with exposed GND pad achieves θJA = 55°C/W - supports 1.5A continuous output in space-constrained designs. |
| Zero-current detection & DCM support | Reduces light-load power loss by disabling bottom FET when inductor current reverses - improves efficiency below ~100mA. |
Applications
| Voltage Tracking Supplies | Point-of-Load Power Supplies |
|---|---|
Use Scenario: Sequencing multiple supply rails (e.g., core, I/O, memory) in FPGAs or ASICs where VOUT must ramp in coordination with a master reference. IC Role / Device Role / Timing Role: LTC3600EDD#TRPBF acts as a follower regulator whose ISET pin is driven by an external ramp voltage, enabling precise output voltage tracking during startup and shutdown. Use Value: Prevents reverse current flow and latch-up by ensuring slave rails never exceed master rail voltage - eliminates need for external OR-ing diodes or sequencing ICs. | Use Scenario: Providing clean, regulated 1.2V/1.8V/3.3V power directly adjacent to high-speed microcontrollers or RF transceivers on dense PCBs. IC Role / Device Role / Timing Role: LTC3600EDD#TRPBF serves as a compact, high-efficiency buck converter with integrated power switches and internal compensation - minimizing external component count. Use Value: Achieves >94% efficiency at 1A with only 2.2µH inductor and 22µF ceramic output cap - reduces board area by >40% vs. traditional controller+MOSFET solutions. |
| Portable Instruments | Distributed Power Systems |
Use Scenario: Battery-powered handheld test equipment requiring long runtime and stable analog supply rails under varying load conditions. IC Role / Device Role / Timing Role: LTC3600EDD#TRPBF functions as the main system regulator converting dual-cell Li-ion (8.4V max) to 3.3V for ADCs, op-amps, and displays. Use Value: Delivers 95% efficiency at 500mA while drawing only 1.5µA in shutdown - extends battery life between charges without compromising measurement accuracy. | Use Scenario: Industrial IoT nodes with isolated 24V bus powering multiple sensor subsystems (temperature, pressure, IMU) each needing independent 5V/3.3V rails. IC Role / Device Role / Timing Role: LTC3600EDD#TRPBF operates as a local point-of-load regulator downstream of an isolated DC/DC converter - rejecting bus ripple and providing fast transient response. Use Value: Maintains <1% output deviation during 1A load steps due to constant-on-time control - prevents sensor data corruption during burst transmissions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54302DDAR | Fixed 500kHz fSW; 3.5V–28V VIN; 3A output; requires feedback divider; no ISET-based programming. | Better suited for higher-input industrial rails; lacks single-resistor VOUT flexibility and tracking capability. | Select when input exceeds 15V or output current >1.5A is required; avoid if VOUT programmability or soft-start control via ISET is needed. |
| MP2315GJ-Z | 3.3V–17V VIN; 2A output; 500kHz fixed fSW; no ISET pin; uses standard resistor divider; smaller 8-pin SOIC package. | Lower cost and simpler layout; missing PGOOD, MODE/SYNC, and external frequency adjustment. | Choose for cost-sensitive, fixed-output applications where advanced features like synchronization or tracking are unnecessary. |
Compared with TPS54302DDAR and MP2315GJ-Z, the LTC3600EDD#TRPBF uniquely combines single-resistor VOUT programming, ±1% ISET accuracy, and constant-on-time architecture - making it optimal for precision-tracking and fast-transient embedded power rails where layout area and component count are constrained.
Availability
LTC3600EDD#TRPBF is available at Aetrix Electronics and suitable for voltage tracking supplies, point-of-load power supplies, and portable instrumentation requiring stable component supply and guaranteed long-term availability.
Supply support for LTC3600EDD#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 acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for all Linear-branded power management ICs.
The LTC3600EDD#TRPBF belongs to Linear's high-efficiency monolithic buck regulator family, designed specifically for space-constrained, high-performance point-of-load applications demanding precision output control, fast transient response, and minimal external components.
FAQ
What is the maximum output voltage range supported by the LTC3600EDD#TRPBF?
The LTC3600EDD#TRPBF supports an output voltage range from 0V up to VIN – 0.5V. For example, with a 12V input, VOUT can be programmed from 0V to 11.5V using the ISET pin's 50µA current source and an external resistor. This rail-to-rail capability is enabled by direct unity-gain feedback from VOUT to the error amplifier, eliminating traditional resistor-divider limitations. The LTC3600EDD#TRPBF achieves this while maintaining ±1% regulation accuracy across the full range.
How does the LTC3600EDD#TRPBF achieve fast load transient response?
The LTC3600EDD#TRPBF uses a constant-on-time (COT) control architecture with current-mode sensing, allowing it to respond to load steps in under 10µs without external loop compensation. The ITH pin voltage directly controls valley inductor current, and the internal one-shot timer adjusts off-time dynamically to maintain regulation. This architecture, combined with the 30ns minimum on-time, ensures stability and speed even at high step-down ratios. The LTC3600EDD#TRPBF demonstrates this in typical waveforms where VOUT deviation remains under 50mV for 1A load steps.
Can the LTC3600EDD#TRPBF be synchronized to an external clock, and what are the constraints?
Yes, the LTC3600EDD#TRPBF can be synchronized to an external clock applied to the MODE/SYNC pin. The internal PLL has a ±30% lock range around the RT-programmed frequency, so the external clock must fall within that window (e.g., if RT sets 1MHz, the clock must be 700kHz–1.3MHz). The LTC3600EDD#TRPBF will then track the external clock's edges, eliminating beat frequencies and reducing EMI in multi-regulator systems. No additional components are required beyond connecting the clock source to MODE/SYNC.
What is the role of the exposed pad (Pin 13) on the LTC3600EDD#TRPBF DFN package?
The exposed pad (Pin 13) on the LTC3600EDD#TRPBF is electrically and thermally connected to GND. It serves as the primary return path for both high-current power MOSFETs and small-signal ground references. To ensure specified thermal performance (θJA = 55°C/W) and electrical integrity, the pad must be soldered to a solid PCB ground plane with ≥4 thermal vias. Leaving it unconnected or floating degrades efficiency, increases junction temperature, and may cause instability or premature failure. The LTC3600EDD#TRPBF datasheet explicitly requires this connection.
Does the LTC3600EDD#TRPBF support output voltage soft-start, and how is it implemented?
Yes, the LTC3600EDD#TRPBF supports programmable soft-start via an external capacitor on the ISET pin. Since VOUT directly follows VISET, placing CSET between ISET and GND creates an RC time constant that controls the ramp rate: tSS ≈ 2.3 × RSET × CSET (0% to 90% VOUT). For example, with RSET = 49.9kΩ and CSET = 100nF, tSS ≈ 1.15ms. This method eliminates inrush current, prevents output overshoot, and enables controlled power-up sequencing. The LTC3600EDD#TRPBF also supports external voltage-driven soft-start by applying a ramp to ISET.
LTC3600EDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-WFDFN 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-DFN (3x3)
LTC3600EDD#TRPBF FAQ
1.How can I place an order for LTC3600EDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3600EDD#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 LTC3600EDD#TRPBF reliable?
The price and inventory of LTC3600EDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3600EDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3600EDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3600EDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3600EDD#TRPBF?
LTC3600EDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3600EDD#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 LTC3600EDD#TRPBF?
For technical support, including LTC3600EDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3600EDD#TRPBF requirements.
6.How does Aetrix verify that LTC3600EDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3600EDD#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 LTC3600EDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3600EDD#TRPBF?
All LTC3600EDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3600EDD#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 LTC3600EDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3600EDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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