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Analog Devices Inc. LTC3700EMS#PBF
- Part No.:
- LTC3700EMS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC3700EMS#PBF.pdf
- Description:
- IC REG DL BUCK/LNR 550KHZ 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,609
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Product details
Overview
LTC3700EMS#PBF from Analog Devices (formerly Linear Technology) is a constant-frequency current-mode step-down DC/DC controller with integrated 150mA LDO regulator. It delivers ±2.5% output voltage accuracy, operates from 2.65V to 9.8V input, supports 550kHz switching, and achieves up to 94% efficiency in buck mode. Used in dual-output power supplies for notebook computers and Li-ion–powered portable instruments.
For engineers reviewing the LTC3700EMS#PBF datasheet, LTC3700EMS#PBF pinout, LTC3700EMS#PBF application, or LTC3700EMS#PBF equivalent, key selection criteria include its dual-regulator architecture (buck + LDO), 0.8V reference, Burst Mode® operation for light-load efficiency, 10-pin MSOP package, and shared PGOOD output for system monitoring.
Technical Context
The LTC3700EMS#PBF integrates two independent regulation paths: a high-efficiency synchronous-external P-channel MOSFET buck controller and a standalone 150mA LDO with current limit and thermal shutdown. Both share a common 0.8V bandgap reference and PGOOD signal, enabling coordinated power-good assertion across outputs.
Its current-mode control ensures fast line/load transient response; undervoltage lockout (2.1V threshold) disables operation below safe input levels; and slope compensation maintains stability above 40% duty cycle. Burst Mode® reduces quiescent current to 260µA total in normal operation and 10µA in shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.65V to 9.8V - supports single/dual Li-ion battery inputs and 3.3V/5V rails. |
| Switching Frequency | 550kHz (typ) - enables compact 10µH inductors and low-profile designs. |
| Buck Output Accuracy | ±2.5% - tight regulation over line, load, and temperature for stable core logic supplies. |
| LDO Output Current | 150mA - sufficient for auxiliary rails like USB PHY, sensors, or I/O buffers. |
| Quiescent Current | 260µA total - combines 210µA (buck) + 50µA (LDO); critical for battery runtime. |
| Shutdown Current | 10µA - ultra-low leakage during system sleep states. |
| Reference Voltage | 0.800V (±2.5%) - sets precise output voltages via external resistor dividers. |
Pinout & Package
The LTC3700EMS#PBF is housed in a thermally enhanced 10-pin MSOP package (3mm × 3mm, 0.5mm pitch), optimized for space-constrained portable applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN2 (Pin 1) | LDO input supply | Accepts independent 2.4V–6V source; decoupling required for noise immunity. |
| LDO (Pin 2) | LDO regulated output | Delivers 150mA at dropout ≤270mV (3.3V in, 150mA out); requires ≥2.2µF ceramic capacitor to GND. |
| VFB2 (Pin 3) | LDO feedback input | Monitors LDO output via resistor divider; enables adjustable LDO voltage (e.g., 2.5V). |
| PGOOD (Pin 4) | Open-drain power-good output | Asserts high-impedance when both buck and LDO outputs are within ±7.5%; simplifies system sequencing. |
| GND (Pin 5) | Common ground | Shared return path for buck, LDO, and sensing; critical for noise reduction and stability. |
| PGATE (Pin 6) | P-channel MOSFET gate driver | Drives external high-side switch with rail-to-rail swing (0V to VIN); supports logic-level MOSFETs. |
| VIN (Pin 7) | Buck input supply | Primary power source for buck controller; UVLO triggers at 2.1V falling edge. |
| SENSE– (Pin 8) | Current-sense negative input | Measures voltage drop across external sense resistor (e.g., 0.068Ω); sets peak inductor current. |
| VFB (Pin 9) | Buck feedback input | Compares divided output voltage against 0.8V reference; sets main rail (e.g., 1.8V). |
| ITH/RUN (Pin 10) | Error amp compensation & enable | Controls current limit threshold; <0.3V shuts down both regulators; internal 0.5µA charge source enables soft-start. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-output architecture | Single-chip integration of buck controller + LDO eliminates discrete regulators and reduces BOM count by ≥3 components. |
| Burst Mode® operation | Extends battery life by reducing switching losses at light loads while maintaining regulation. |
| 100% duty-cycle dropout | Maintains LDO-like behavior under low-VIN conditions-no output collapse during brownout. |
| Shared PGOOD output | Reduces system monitoring complexity by combining status of two independent power rails into one signal. |
| Thermal & current protection | LDO includes foldback current limiting and 150°C thermal shutdown; buck includes OVP and short-circuit frequency foldback. |
Applications
| Notebook Computers | Portable Instruments |
|---|---|
Use Scenario: Dual-rail CPU core (1.8V) and peripheral (2.5V) supply in ultraportable notebooks. IC Role / Device Role / Timing Role: Primary buck controller regulates main processor VDD; integrated LDO powers USB transceivers and sensor interfaces. Use Value: Eliminates need for separate LDO IC, saving PCB area and reducing component count without sacrificing regulation accuracy or transient response. | Use Scenario: Handheld multimeter or data logger powered by two Li-ion cells (6.4V–8.4V). IC Role / Device Role / Timing Role: Buck converts battery voltage to 3.3V microcontroller rail; LDO provides clean 2.5V reference for ADC and precision analog front-end. Use Value: Shared 0.8V reference ensures tracking between rails; PGOOD simplifies power-on reset sequencing across digital and analog domains. |
| One or Two Li-Ion Battery-Powered Applications | Dual Output Regulator in Tiny 10-Pin MSOP |
Use Scenario: Wearable health monitor with Bluetooth LE MCU and optical heart-rate sensor. IC Role / Device Role / Timing Role: Buck supplies 1.2V to ARM Cortex-M0+ core; LDO delivers ripple-free 1.8V to photodiode amplifier and analog signal chain. Use Value: Burst Mode® extends battery life >3× vs continuous mode at standby; 10-pin MSOP fits sub-100mm² PCB footprints. | Use Scenario: Space-constrained IoT node requiring 1.8V logic and 3.3V radio supply. IC Role / Device Role / Timing Role: Single-package solution replaces discrete buck + LDO pair; PGATE drives Si3443DV P-MOSFET; LDO powers RF transceiver LNA stage. Use Value: Reduces layout complexity and EMI risk by integrating feedback networks and shared ground; MSOP thermal pad improves power dissipation in sealed enclosures. |
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 |
|---|---|---|---|
| LTC3717EMS#PBF | Higher 1MHz switching frequency; supports N-channel MOSFETs; no integrated LDO. | Requires external LDO for second rail; better suited for higher-density, higher-efficiency designs where board space allows extra components. | Select when needing >1MHz operation or N-MOSFET drive; avoid if LDO integration is mandatory. |
| TPS54202DRCT | Integrated 2A buck converter (no LDO); 500kHz fixed frequency; lower IQ (35µA shutdown). | Cannot replace LDO function; requires separate LDO IC for second output; simpler control loop but less feature-rich. | Choose for cost-sensitive, single-rail applications where dual output is implemented externally. |
Compared with LTC3700EMS#PBF, LTC3717EMS#PBF offers higher frequency and N-MOSFET support but lacks LDO integration, while TPS54202DRCT provides lower quiescent current and integrated FETs but requires external regulation for the second rail-making LTC3700EMS#PBF uniquely suited for compact dual-output systems needing minimal external components.
Availability
LTC3700EMS#PBF is available at Aetrix Electronics and suitable for notebook computers, portable instrumentation, and Li-ion–powered medical wearables requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3700EMS#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 legacy Linear parts including the LTC3700 series.
The LTC3700 belongs to Linear's high-efficiency DC/DC controller family, designed specifically for space- and battery-constrained portable electronics requiring tightly regulated dual-output power with minimal external components.
FAQ
What is the maximum output current capability of the LTC3700EMS#PBF's integrated LDO?
The LTC3700EMS#PBF's integrated LDO delivers up to 150mA continuous output current. Its dropout voltage is 270mV at 150mA with 3.3V input, 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#PBF support synchronization to an external clock?
No, the LTC3700EMS#PBF does not support external clock synchronization. Its oscillator operates at a fixed nominal frequency of 550kHz (range 500kHz–650kHz), with no provision for frequency adjustment or phase-locking to an external signal. For synchronized multi-rail designs, external timing coordination must be implemented at the system level.
How does Burst Mode® operation affect the output voltage ripple of the LTC3700EMS#PBF buck regulator?
In Burst Mode®, the LTC3700EMS#PBF reduces switching frequency and delivers energy in short bursts, which increases low-frequency output voltage ripple compared to continuous mode. However, the LDO output remains unaffected and maintains low ripple due to its linear regulation. Designers should use ≥47µF low-ESR output capacitance (e.g., Sanyo POSCAP) on the buck rail to suppress burst-related ripple while relying on the LDO's inherent filtering for sensitive analog loads.
Can the LTC3700EMS#PBF's PGOOD pin indicate fault conditions for only one regulator?
No-the PGOOD pin on the LTC3700EMS#PBF is a combined open-drain output that asserts high-impedance only when *both* the buck output (monitored at VFB) *and* the LDO output (monitored at VFB2) are within ±7.5% of their respective target voltages. If either rail falls outside this window, PGOOD pulls low. There is no individual rail status reporting; discrete monitoring requires external comparators.
What is the recommended minimum output capacitance for stable operation of the LTC3700EMS#PBF's LDO regulator?
The LTC3700EMS#PBF's LDO requires a minimum 2.2µF ceramic capacitor from LDO (Pin 2) to GND (Pin 5) for stability. This capacitor must have low ESR and be placed close to the pins. For improved transient response-especially under dynamic 150mA loads-larger values (e.g., 10µF) are recommended, provided they maintain low impedance across the 10Hz–1MHz range. Tantalum or polymer capacitors may be used if ceramic size constraints apply.
LTC3700EMS#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC3700EMS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3700EMS#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 LTC3700EMS#PBF reliable?
The price and inventory of LTC3700EMS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3700EMS#PBF is usually 5 days.
3.What payment methods are accepted for LTC3700EMS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3700EMS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3700EMS#PBF?
LTC3700EMS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3700EMS#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 LTC3700EMS#PBF?
For technical support, including LTC3700EMS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3700EMS#PBF requirements.
6.How does Aetrix verify that LTC3700EMS#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3700EMS#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 LTC3700EMS#PBF meets industry standards.
7.What is the process for return or replacement of LTC3700EMS#PBF?
All LTC3700EMS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3700EMS#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 LTC3700EMS#PBF part is unused and in its original packaging.
Return procedure for LTC3700EMS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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