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Analog Devices Inc. LTC3670EDDB#TRPBF
- Part No.:
- LTC3670EDDB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC3670EDDB#TRPBF.pdf
- Description:
- IC REG TRIPLE BCK/LNR SYNC 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,637
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Product details
Overview
LTC3670EDDB#TRPBF from Analog Devices is a monolithic triple-output power management IC integrating a 400mA synchronous buck regulator and two independent 150mA low-dropout linear regulators (LDOs) in a single 3mm × 2mm DFN package. It operates from 2.5V to 5.5V input, supports output voltages down to 0.8V, delivers ±2.5% reference accuracy, and features 2.25MHz constant-frequency switching with Burst Mode® for 70µA quiescent current (all outputs enabled). It is used in portable Li-Ion–powered devices requiring multivoltage rails for SoCs, FPGAs, and RF chipsets.
For engineers reviewing the LTC3670EDDB#TRPBF datasheet, LTC3670EDDB#TRPBF pinout, LTC3670EDDB#TRPBF application, or LTC3670EDDB#TRPBF equivalent, key selection criteria include independent enable control per output, internal soft-start for each regulator, PGOOD monitoring of all enabled outputs, and compatibility with ceramic output capacitors ≥1µF on LDOs and ≥4µF effective capacitance on the buck output.
Technical Context
The LTC3670EDDB#TRPBF implements a current-mode synchronous buck regulator with internal compensation, 2.25MHz fixed-frequency operation, and automatic transition to Burst Mode® at light loads to maintain high efficiency. Its dual LDOs use separate feedback pins (LDO1_FB, LDO2_FB), share the VIN supply, and feature independent enable inputs (ENLDO1, ENLDO2) with internal 4MΩ pull-down resistors.
Power good detection monitors feedback voltage across all enabled regulators against a 92% threshold of their regulation point and asserts PGOOD as an open-drain NMOS output. The device includes undervoltage lockout (2.2V rising threshold), thermal shutdown, and switch-node slew-rate control to reduce EMI-critical for handheld and dense PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-Ion/Polymer batteries and standard 3.3V/5V system rails. |
| Buck Output Current | 400mA - sufficient for core logic or I/O supplies in compact portable systems. |
| LDO Output Current (each) | 150mA - enables powering analog peripherals, sensors, or low-power interfaces without external regulators. |
| Switching Frequency | 2.25MHz (typ) - allows use of small 4.7µH inductors and minimizes footprint. |
| Quiescent Current | 70µA (all outputs enabled) - extends battery life in always-on or standby modes. |
| Reference Accuracy | ±2.5% - ensures stable output voltage under load, temperature, and line variation. |
| PGOOD Threshold | 92% of feedback regulation voltage - provides reliable power sequencing and fault detection. |
Pinout & Package
The LTC3670EDDB#TRPBF is housed in a 12-lead, 3mm × 2mm × 0.75mm plastic DFN package with exposed pad (Pin 13) that must be soldered to PCB ground for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1) | Buck switch node | Connects to inductor; carries high di/dt current - requires short, low-inductance trace to minimize EMI. |
| GND (2) | Ground reference | Main signal and power return; tied internally to exposed pad (Pin 13). |
| ENLDO1 (3) | LDO1 enable input | MOS gate input with 4MΩ internal pull-down - active-high, enables independent LDO1 control. |
| ENLDO2 (4) | LDO2 enable input | MOS gate input with 4MΩ internal pull-down - enables independent LDO2 control without shared logic. |
| ENBUCK (5) | Buck enable input | MOS gate input with 4MΩ internal pull-down - allows sequenced startup or dynamic buck disable. |
| BUCKFB (6) | Buck feedback input | Senses divided output voltage; regulates to 0.8V reference - sets VOUT via external resistor divider. |
| PGOOD (7) | Open-drain power-good indicator | Hi-Z when all enabled outputs are within 8% of target - used for system reset or enable sequencing. |
| LDO2_FB (8) | LDO2 feedback input | Sets LDO2 output voltage via external divider; regulated to same 0.8V reference as buck. |
| LDO1_FB (9) | LDO1 feedback input | Sets LDO1 output voltage independently; identical reference and bias specs as LDO2_FB. |
| LDO1 (10) | LDO1 output | 150mA max output; requires ≥1µF ceramic bypass capacitor to ground for stability. |
| LDO2 (11) | LDO2 output | 150mA max output; requires ≥1µF ceramic bypass capacitor to ground - decoupled separately from LDO1. |
| VIN (12) | Main input supply | 2.5V–5.5V input; must be bypassed with ≥2.2µF ceramic capacitor close to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Triple-output integration | Single-chip solution replaces three discrete regulators - reduces BOM count, board area, and design complexity. |
| Independent enable control | Three dedicated enable pins (ENBUCK, ENLDO1, ENLDO2) allow flexible power sequencing and dynamic rail shutdown. |
| Burst Mode® operation | 70µA IQ at no load maintains >80% efficiency down to ~100µA load - critical for battery longevity. |
| Internal soft-start | 600µs for buck, 100µs for each LDO - prevents inrush current and stabilizes startup without external components. |
| Switch-node slew-rate control | Patent-pending circuitry limits dV/dt on SW pin - reduces radiated EMI without sacrificing efficiency. |
Applications
| Handheld Multimode Devices | Digital Baseband Power |
|---|---|
Use Scenario: DMB/DVB-H multimedia cell phones requiring simultaneous 1.2V (core), 2.8V (I/O), and 3.3V (RF) rails from a single Li-Ion cell. IC Role / Device Role / Timing Role: LTC3670EDDB#TRPBF serves as primary PMIC delivering three regulated voltages with independent enable timing and PGOOD coordination. Use Value: Eliminates need for three separate regulators and simplifies power sequencing - reduces PCB area by >40% vs discrete solution. | Use Scenario: Portable instrumentation with FPGA, ADC, and display interface needing clean, sequenced 1.2V, 1.8V, and 3.3V supplies. IC Role / Device Role / Timing Role: LTC3670EDDB#TRPBF provides low-noise LDO outputs for analog sections and efficient buck for digital core, with PGOOD enabling safe FPGA configuration. Use Value: LDOs deliver <10µVrms noise at 150mA - meets ADC reference and sensor bias requirements without added filtering. |
| Single-Cell Li-Ion Systems | Multivoltage Logic & RF SoC Power |
Use Scenario: Wearable health monitor powered by 3.7V Li-Polymer battery, requiring 0.9V (sensor MCU), 1.8V (BLE radio), and 3.0V (OLED display). IC Role / Device Role / Timing Role: LTC3670EDDB#TRPBF acts as system-level power hub, regulating down from declining battery voltage while maintaining output accuracy to ±2.5%. Use Value: 2.25MHz switching enables tiny 2.0×1.8mm inductors - critical for ultra-thin form factors. | Use Scenario: Compact IoT edge node with ARM Cortex-M SoC, Wi-Fi module, and GPIO expander needing 1.2V (core), 3.3V (peripherals), and 1.8V (I/O). IC Role / Device Role / Timing Role: LTC3670EDDB#TRPBF supplies all three rails with independent enable control - allows dynamic power gating of Wi-Fi during sleep. Use Value: 70µA quiescent current (all outputs enabled) extends battery runtime in low-duty-cycle sensing applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-output PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3672B-1 | Fixed-output variant (1.8V buck, 1.2V/2.8V LDOs); 2mm × 2mm package; higher IQ (260µA). | No external feedback resistors needed - simplifies layout but lacks output voltage flexibility. | Select when fixed voltages match system needs and space is more constrained than adjustability. |
| LTC3445 | I²C-programmable buck + dual 50mA LDOs in 4mm × 4mm QFN; higher IQ (360µA); supports dynamic voltage scaling. | Enables runtime voltage adjustment and telemetry - adds firmware overhead but improves energy optimization. | Select when adaptive power management or remote monitoring is required over static rail generation. |
Compared with LTC3670EDDB#TRPBF, LTC3672B-1 trades programmability for smaller size and lower cost in fixed-rail designs, while LTC3445 adds digital control at the expense of higher quiescent current and larger footprint - making LTC3670EDDB#TRPBF optimal for compact, analog-configured, battery-sensitive applications requiring three independent, adjustable rails.
Availability
LTC3670EDDB#TRPBF is available at Aetrix Electronics and suitable for handheld consumer electronics, portable medical instruments, and single-cell Li-Ion–powered IoT edge nodes requiring stable component supply and long-term production continuity.
Supply support for LTC3670EDDB#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3670EDDB#TRPBF belongs to Analog Devices' Power Management IC product line, designed specifically for space-constrained, battery-powered portable systems requiring multirail power with minimal external components and robust transient response.
FAQ
What is the minimum input voltage required for the LTC3670EDDB#TRPBF to operate?
The LTC3670EDDB#TRPBF has an undervoltage lockout (UVLO) threshold of 2.2V (rising), with guaranteed operation from 2.5V to 5.5V. Below 2.5V, regulation may degrade; the device shuts down entirely below 2.2V. This makes LTC3670EDDB#TRPBF compatible with fully discharged single-cell Li-Ion batteries down to ~2.5V under load.
Can the LTC3670EDDB#TRPBF generate output voltages lower than 0.8V?
No - the LTC3670EDDB#TRPBF uses a fixed 0.8V internal reference for both the buck and LDO feedback loops. Output voltages are set by external resistor dividers using VOUT = 0.8V × (1 + R1/R2). The lowest practical output is limited by resistor tolerance and noise; 0.8V is the absolute minimum regulation point. LTC3670EDDB#TRPBF cannot produce sub-0.8V outputs.
How does the PGOOD pin behave when only one output is enabled?
The PGOOD pin on the LTC3670EDDB#TRPBF goes high-impedance only when *all enabled* regulators meet the 92% regulation threshold. If only one output is enabled, PGOOD asserts Hi-Z once that single output reaches 92% of its target. If no outputs are enabled, PGOOD remains pulled low. This behavior enables precise sequencing control in multi-rail systems using LTC3670EDDB#TRPBF.
What is the maximum allowable output current for each LDO in the LTC3670EDDB#TRPBF?
Each LDO in the LTC3670EDDB#TRPBF is rated for up to 150mA continuous output current. Absolute maximum ratings specify 250mA peak, but sustained operation above 150mA risks thermal overload and voltage droop beyond specification. The LDO dropout voltage is 200mV at 150mA (VIN = 3.6V), so input headroom must be maintained. LTC3670EDDB#TRPBF's LDOs are not intended for >150mA loads.
Is an external compensation network required for the buck regulator in the LTC3670EDDB#TRPBF?
No - the buck regulator in the LTC3670EDDB#TRPBF features fully internal loop compensation. Only a single ceramic output capacitor (≥4µF effective capacitance) is required for stability. No external RC networks, type-2 or type-3 compensators, or feedforward capacitors are needed - simplifying design and reducing bill-of-materials. This is explicitly confirmed in the datasheet's "Internal control-loop compensation simplifies application design" statement for LTC3670EDDB#TRPBF.
LTC3670EDDB#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Topology:
- Step-Down (Buck) Synchronous (1), Linear (LDO) (2)
- Number of Outputs:
- 3
- Frequency - Switching:
- 2.25MHz
- Voltage/Current - Output 1:
- Adj to 0.8V, 400mA
- Voltage/Current - Output 2:
- Adj to 0.8V, 150mA
- Voltage/Current - Output 3:
- Adj to 0.8V, 150mA
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- No
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (3x2)
LTC3670EDDB#TRPBF FAQ
1.How can I place an order for LTC3670EDDB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3670EDDB#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 LTC3670EDDB#TRPBF reliable?
The price and inventory of LTC3670EDDB#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3670EDDB#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3670EDDB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3670EDDB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3670EDDB#TRPBF?
LTC3670EDDB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3670EDDB#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 LTC3670EDDB#TRPBF?
For technical support, including LTC3670EDDB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3670EDDB#TRPBF requirements.
6.How does Aetrix verify that LTC3670EDDB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3670EDDB#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 LTC3670EDDB#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3670EDDB#TRPBF?
All LTC3670EDDB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3670EDDB#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 LTC3670EDDB#TRPBF part is unused and in its original packaging.
Return procedure for LTC3670EDDB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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