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Analog Devices Inc. LTC3700EMS#TRPBF
- Part No.:
- LTC3700EMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC3700EMS#TRPBF.pdf
- Description:
- IC REG DL BUCK/LNR 550KHZ 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,548
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Product details
Overview
LTC3700EMS#TRPBF from Analog Devices (formerly Linear Technology) is a constant-frequency current-mode step-down DC/DC controller with integrated 150mA LDO regulator, designed for dual-output power management in space-constrained portable systems. It delivers ±2.5% output voltage accuracy, operates from 2.65V to 9.8V input, supports 550kHz switching, and achieves up to 94% efficiency at 1A load with 1.8V output.
For engineers reviewing the LTC3700EMS#TRPBF datasheet, LTC3700EMS#TRPBF pinout, LTC3700EMS#TRPBF application, or LTC3700EMS#TRPBF equivalent, key selection considerations include its dual-regulator architecture, 0.8V reference enabling low-VOUT designs, Burst Mode® operation for light-load efficiency, 10µA shutdown current, and MSOP-10 package compatibility with high-density PCB layouts.
Technical Context
The LTC3700EMS#TRPBF integrates two independent regulation paths: a P-channel MOSFET-based buck controller using peak-current-mode control with slope compensation above 40% duty cycle, and a separate LDO regulator with internal P-FET pass device. Both share a common 0.8V bandgap reference and PGGOOD output.
Its control architecture includes undervoltage lockout (2.1V threshold), overvoltage protection (±7.5% trip), thermal shutdown (150°C), and short-circuit foldback via oscillator frequency reduction to 110kHz during fault conditions - all implemented without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Constant-frequency current-mode buck controller + linear LDO regulator |
| Input Voltage Range | 2.65V to 9.8V for buck; 2.4V to 6V for LDO - enables single-cell Li-ion to multi-cell battery or adapter input support |
| Switching Frequency | 550kHz typical - allows compact 10µH inductor and ceramic output capacitors |
| Output Accuracy | ±2.5% over line/load/temperature - ensures stable core voltage for microprocessors and FPGAs |
| Quiescent Current | 260µA total (210µA buck + 50µA LDO) - extends battery runtime in always-on subsystems |
| Shutdown Current | 10µA combined - critical for low-power sleep modes in portable instrumentation |
| LDO Output | 150mA max, 270mV dropout at 150mA (VIN2 = 3.3V) - supports auxiliary rails like USB PHY or sensor bias |
Pinout & Package
The LTC3700EMS#TRPBF is housed in a 10-pin MSOP package (3mm × 3mm, 0.5mm pitch) with exposed pad for thermal enhancement. Pin 1 is VIN2 (LDO input), pin 5 is GND (common ground), and pin 10 is ITH/RUN (shared run control and compensation node).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN2 (Pin 1) | LDO input supply | Accepts independent 2.4–6V source; decoupling required within 2mm of GND |
| LDO (Pin 2) | LDO regulated output | Delivers up to 150mA; requires ≥2.2µF low-ESR ceramic capacitor to GND |
| VFB2 (Pin 3) | LDO feedback input | Senses resistor divider from LDO to GND; sets LDO output voltage |
| PGOOD (Pin 4) | Open-drain power-good indicator | Asserts low if either buck or LDO output deviates >±7.5% from target |
| GND (Pin 5) | Common analog/digital ground | Reference for both regulators and feedback networks; must be low-impedance plane |
| PGATE (Pin 6) | P-channel MOSFET gate driver | Swings 0V to VIN; drives external Si3443DV or similar logic-level P-FET |
| VIN (Pin 7) | Buck input supply | 2.65–9.8V input; requires local 10µF ceramic decoupling |
| SENSE– (Pin 8) | Buck current-sense negative input | Monitors voltage across external 0.068Ω sense resistor for current limiting |
| VFB (Pin 9) | Buck feedback input | Compares divided output voltage against 0.8V reference to regulate VOUT1 |
| ITH/RUN (Pin 10) | Error amplifier output & enable control | Sets peak current threshold; <0.3V disables both regulators; internal 0.5µA charge source enables soft-start |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent regulation | Simultaneous 1.8V/1A buck + 2.5V/150mA LDO in one 10-pin MSOP - eliminates need for discrete second regulator |
| Burst Mode® operation | Enables >85% efficiency at 10mA load by gating switching cycles - extends battery life in standby mode |
| 100% duty-cycle dropout | Maintains regulation as VIN approaches VOUT by holding P-FET fully on - prevents brownout during battery sag |
| Shared PGGOOD output | Single open-drain signal confirms both outputs are in regulation - simplifies system power sequencing |
| Integrated protection | UVLO (2.1V), OVP (±7.5%), thermal shutdown (150°C), and short-circuit foldback - reduces BOM count and layout area |
Applications
| Notebook Computers | Portable Instruments |
|---|---|
Use Scenario: Powering CPU core (1.8V/1A) and USB PHY (2.5V/150mA) from single Li-ion cell. IC Role / Device Role / Timing Role: Dual-output controller providing tightly regulated, sequenced supplies with shared power-good signaling. Use Value: Eliminates discrete LDO, reduces solution size by 35%, and maintains >90% efficiency across 10mA–1A load range. | Use Scenario: Supplying FPGA I/O bank (1.8V) and analog front-end sensor bias (2.5V) in handheld test equipment. IC Role / Device Role / Timing Role: Primary power manager delivering low-noise, fast-transient LDO output alongside high-efficiency buck rail. Use Value: Achieves <20mV load transient deviation on LDO output and <1% line regulation on buck output - meets precision measurement requirements. |
| One or Two Li-Ion Battery-Powered Applications | Dual Output Regulator in Tiny 10-Pin MSOP |
Use Scenario: Powering Bluetooth SoC (1.8V) and RF transceiver (2.5V) from 3.3V–4.2V battery pack. IC Role / Device Role / Timing Role: Efficient dual-rail generator with adaptive Burst Mode® to maintain >88% efficiency down to 5mA load. Use Value: Extends battery runtime by 22% versus fixed-frequency-only controllers under intermittent wireless traffic loads. | Use Scenario: Replacing two discrete regulators (buck + LDO) in space-limited medical wearables. IC Role / Device Role / Timing Role: Highly integrated power solution minimizing PCB footprint while maintaining independent feedback loops. Use Value: Reduces component count by 40%, saves 28mm² board area, and enables conformal coating over single IC instead of multiple devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3502AEDD#PBF | Single buck controller only (no integrated LDO); 3MHz switching; requires external LDO for second rail | Higher frequency enables smaller magnetics but increases EMI filtering complexity; no native dual-rail coordination | Choose when higher switching frequency and lower output ripple are prioritized over integration and board area |
| TPS54202DDCR | Single buck controller with integrated N-FET; no LDO; 400kHz–2.5MHz adjustable frequency; no Burst Mode® | Lacks LDO functionality and low-load efficiency optimization; requires external LDO and sequencing logic | Prefer when cost-sensitive designs can accept discrete LDO and tolerate higher quiescent current (47µA vs LTC3700's 260µA active) |
Compared with LT3502AEDD#PBF and TPS54202DDCR, the LTC3700EMS#TRPBF uniquely integrates both buck and LDO regulation with shared PGGOOD, enabling true dual-rail power management in minimal area - critical for ultra-portable devices where PCB real estate and battery life are constrained.
Availability
LTC3700EMS#TRPBF is available at Aetrix Electronics and suitable for notebook computers, portable instrumentation, and Li-ion battery-powered medical devices requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3700EMS#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 continues its legacy of high-performance analog and power management ICs for demanding applications.
The LTC3700EMS#TRPBF belongs to Linear's precision DC/DC controller family, engineered specifically for dual-output, battery-operated portable electronics where efficiency, small size, and robust protection are mandatory.
FAQ
What is the maximum output current capability of the LTC3700EMS#TRPBF's integrated LDO regulator?
The LTC3700EMS#TRPBF's integrated LDO regulator delivers up to 150mA continuous output current. Its dropout voltage is 270mV at 150mA when VIN2 = 3.3V, and it includes current-limit protection that begins reducing output voltage near 200mA and limits short-circuit current to approximately 225mA. Thermal shutdown activates at 150°C to prevent damage during sustained overload.
Does the LTC3700EMS#TRPBF support synchronous rectification?
No, the LTC3700EMS#TRPBF does not support synchronous rectification. It drives an external P-channel MOSFET (e.g., Si3443DV) as the high-side switch and requires an external Schottky catch diode (e.g., MBRM120T3). The controller lacks gate-drive outputs for a synchronous N-channel bottom switch, and its current-sense architecture is optimized for P-FET operation with SENSE– referenced to ground.
How does the LTC3700EMS#TRPBF achieve high efficiency at light loads?
The LTC3700EMS#TRPBF achieves high light-load efficiency through Burst Mode® operation. When load current drops below ~100mA, the controller reduces switching frequency and gates entire burst cycles, lowering average quiescent current to ~200µA. This mode maintains >85% efficiency at 10mA output while keeping output voltage regulation within ±2.5% - significantly outperforming forced continuous conduction mode.
What is the purpose of the ITH/RUN pin on the LTC3700EMS#TRPBF?
The ITH/RUN pin on the LTC3700EMS#TRPBF serves two critical functions: it acts as the error amplifier's output node for loop compensation (via external RC network), and as the global enable/disable control for both the buck and LDO regulators. Pulling this pin below 0.3V shuts down both regulators and places PGATE high and LDO in high-impedance state; releasing it initiates soft-start via an internal 0.5µA current source.
Can the LTC3700EMS#TRPBF operate with input voltages below 3V?
Yes, the LTC3700EMS#TRPBF operates down to 2.65V input (buck) and 2.4V (LDO), with undervoltage lockout disabling operation below 2.1V (typical). However, maximum output current decreases below 3V input due to reduced gate drive headroom for the P-FET; Figure 3 in the datasheet shows regulated reference and ITH voltage degradation starting at VIN < 2.3V, limiting full-rated performance to VIN ≥ 3V.
LTC3700EMS#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Topology:
- Step-Down (Buck) (1), Linear (LDO) (1)
- Number of Outputs:
- 2
- Frequency - Switching:
- 550kHz
- Voltage/Current - Output 1:
- Adj to 0.8V, 5A
- Voltage/Current - Output 2:
- Adj to 0.8V, 150mA
- Voltage/Current - Output 3:
- -
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- No
- Voltage - Supply:
- 2.4V ~ 9.8V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
LTC3700EMS#TRPBF FAQ
1.How can I place an order for LTC3700EMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3700EMS#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 LTC3700EMS#TRPBF reliable?
The price and inventory of LTC3700EMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3700EMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3700EMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3700EMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3700EMS#TRPBF?
LTC3700EMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3700EMS#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 LTC3700EMS#TRPBF?
For technical support, including LTC3700EMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3700EMS#TRPBF requirements.
6.How does Aetrix verify that LTC3700EMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3700EMS#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 LTC3700EMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3700EMS#TRPBF?
All LTC3700EMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3700EMS#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 LTC3700EMS#TRPBF part is unused and in its original packaging.
Return procedure for LTC3700EMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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