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Analog Devices Inc. LTC3100EUD#TRPBF
- Part No.:
- LTC3100EUD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC3100EUD#TRPBF.pdf
- Description:
- IC REG TRIPLE BUCK/BST/LNR 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,053
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Product details
Overview
LTC3100EUD#TRPBF from Analog Devices (formerly Linear Technology) is a triple-output power management IC integrating a 700mA synchronous step-up converter, a 250mA synchronous step-down converter, and a 100mA LDO regulator in a single 3mm × 3mm QFN package. It operates from an ultra-low 0.65V input (boost start-up), delivers 1.5–5.25V boost, 0.6–5.5V buck, and 0.618–5.25V LDO outputs, and supports burst mode for 15µA quiescent current - ideal for battery-powered medical instruments and bar code readers.
For engineers reviewing the LTC3100EUD#TRPBF datasheet, LTC3100EUD#TRPBF pinout, LTC3100EUD#TRPBF application, or LTC3100EUD#TRPBF equivalent, key selection considerations include its dual-converter cascade capability, independent RUN pin control per rail, 1.5MHz fixed-frequency operation with internal compensation, and true output disconnect in boost mode to prevent reverse current.
Technical Context
The LTC3100EUD#TRPBF implements current-mode PWM control across both switching regulators using a shared 1.5MHz oscillator and adaptive slope compensation for stable transient response without external compensation. Its boost converter features low-RDS(ON) N- and P-channel MOSFETs (0.3Ω/0.4Ω typ), zero-current detection for discontinuous-mode efficiency, and anti-ringing circuitry to suppress SWBST ringing.
The buck converter accepts input from either an independent 1.8–5.5V source or cascaded from VBST, while the LDO draws directly from VBST and provides sequencing control via RUNLDO. All three rails support independent enable/disable via RUNBST, RUNBK, and RUNLDO pins, and each includes dedicated power-good indicators (PGBST, PGBK) referenced to ±8% feedback thresholds with 3% hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Boost Input Range | 0.65V to 5V - enables direct operation from single alkaline/NiMH cell; start-up at 0.65V eliminates need for auxiliary charge pump. |
| Boost Output Range | 1.5V to 5.25V - programmable via resistor divider on FBBST; 1.20V internal reference ensures tight regulation. |
| Buck Output Current | 250mA - sufficient for microcontroller cores or interface ICs; P-channel switch limits max duty cycle to 100% for full VIN-to-VOUT operation. |
| LDO Dropout Voltage | 130mV at 100mA - allows 1.8V output from 2.0V VBST supply; enables low-noise biasing of sensitive analog circuits. |
| Quiescent Current (Burst) | 15µA - measured on VBST with MODE high and all RUN pins active; sustains >10-year shelf life in coin-cell applications. |
| Switching Frequency | 1.5MHz (±20%) - permits use of 3.3µH inductor and 10µF ceramic output caps; minimizes solution footprint vs lower-frequency alternatives. |
| Package | 16-lead 3mm × 3mm QFN with exposed pad - thermal resistance θJA = 68°C/W on 4-layer board; exposed pad must be soldered to GND for thermal and electrical integrity. |
Pinout & Package
Package: 16-lead (3mm × 3mm) plastic QFN with exposed thermal pad (Pin 17 = GND). Requires soldering of exposed pad to PCB ground plane for thermal performance and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SWBST (1) | Boost switch node | Connects to inductor; internal anti-ringing switch clamps to VINBST when inductor current reaches zero - reduces EMI in DCM. |
| VBST (2) | Boost output / LDO input | Supplies LDO and can power buck stage; requires ≥10µF ceramic cap close to pin; serves as primary power domain for internal circuitry post-startup. |
| VLDO (3) | LDO output | Provides low-noise 100mA rail; 2.2µF recommended for PSRR >35dB at 1.5MHz; dropout voltage ≤200mV ensures regulation under load transients. |
| SWBK (4) | Buck switch node | Connects to buck inductor; same 1.5MHz clock as boost; internal slope compensation prevents subharmonic oscillation above 50% duty cycle. |
| VINBK (5) | Buck input | Accepts 1.8–5.5V - may be separate source or VBST; 4.7µF min decoupling required to sustain 250mA peak current without droop. |
| PGBK (6) | Buck power-good indicator | Open-drain output pulls low if FBBK falls >8% below target; requires external pull-up <6V; 60µs deglitch prevents false trips on load steps. |
| GND (7) | Signal ground | Must connect directly to PCB ground plane; shared reference for all regulators and error amplifiers; ties to exposed pad for thermal path. |
| RUNBK (8) | Buck enable control | Internal 4MΩ pull-down; logic-high (>0.9V) enables buck; low (<0.3V) forces shutdown with <1µA quiescent current. |
| FBBK (9) | Buck feedback input | 600mV internal reference; connects to resistor divider; input current ≤30nA minimizes divider error and leakage-induced offset. |
| RUNLDO (10) | LDO enable control | Internal 4MΩ pull-down; high enables LDO; low disables output and reduces IQ to 26–40µA (measured on VBST). |
| FBLDO (11) | LDO feedback input | 600mV reference; supports adjustable output from 0.618V; feedback current ≤30nA preserves accuracy with high-value dividers. |
| FBBST (12) | Boost feedback input | 1.20V reference; sets VBST via R1/R2 divider; feedback current ≤50nA ensures stable regulation across temperature. |
| MODE (13) | Burst mode control | Internal 1MΩ pull-up; float/high enables Burst Mode for both converters; grounded forces fixed-frequency operation for noise-sensitive designs. |
| RUNBST (14) | Boost enable control | Internal 4MΩ pull-down; high enables boost; low shuts down entire boost stage and disables VBST output. |
| PGBST (15) | Boost power-good indicator | Open-drain output with 13Ω typical pull-down strength at 3.3V; asserts low on undervoltage or shutdown - used for system sequencing. |
| VINBST (16) | Boost input | Accepts 0.65–5V; requires ≥1µF ceramic decoupling; start-up oscillator activates at 0.65V, enabling single-cell operation. |
| Exposed Pad (17) | Thermal & power ground | Mandatory GND connection; failure to solder degrades θJA significantly and risks thermal shutdown during sustained 700mA boost operation. |
Key Features
| Feature | Design Value |
|---|---|
| Triple-rail integration | Combines boost, buck, and LDO in one die - eliminates discrete PMIC complexity and reduces BOM count by ≥7 components in portable instrumentation. |
| True output disconnect | Prevents reverse current through internal P-MOSFET body diode during shutdown - enables zero-load battery drain and safe hot-swap of input sources. |
| Independent RUN pin control | Each regulator has dedicated enable (RUNBST/RUNBK/RUNLDO) - supports flexible power sequencing (e.g., LDO enabled only after VBST stabilizes). |
| 1.5MHz fixed-frequency + Burst Mode | Fixed frequency ensures predictable EMI; Burst Mode drops IQ to 15µA at light loads - extends battery life without compromising transient response. |
| Internal loop compensation | Eliminates external compensation networks for both converters - reduces design risk and layout sensitivity while maintaining >60° phase margin. |
| Anti-ringing circuitry | Damps SWBST resonance during discontinuous conduction - cuts radiated EMI by >10dB compared to standard boost topologies at 100–300MHz. |
Applications
| Medical Instrumentation | Bar Code Readers |
|---|---|
Use Scenario: Portable glucose meters and handheld pulse oximeters powered by single AA/AAA cells requiring isolated analog sensor bias, digital core supply, and clean display backlight drive. IC Role / Device Role / Timing Role: LTC3100EUD#TRPBF generates 3.3V (buck) for MCU, 5V (boost) for optical sensor bias, and 1.8V (LDO) for ADC reference - all from 0.65–1.8V input. Use Value: Ultra-low start-up voltage enables full functionality down to end-of-cell voltage; LDO ripple rejection >35dB ensures <1 LSB error in 12-bit ADC measurements. | Use Scenario: Battery-operated laser or imager-based scanners needing fast wake-up, low standby power, and simultaneous 3.3V logic and 5V laser diode drive. IC Role / Device Role / Timing Role: LTC3100EUD#TRPBF powers 3.3V microcontroller (buck), 5V laser driver (boost), and 2.5V image sensor analog rail (LDO) - with independent RUN control for rapid sleep/wake cycles. Use Value: 15µA Burst Mode IQ extends battery life to >1 year in intermittent-scan usage; PGBST/PGBK signals coordinate laser activation only after rail stabilization. |
| Low-Power IoT Sensors | Wearable Health Monitors |
Use Scenario: Coin-cell-powered environmental sensors transmitting data via BLE, requiring regulated 1.8V for RF transceiver, 3.0V for MCU, and ultra-low-noise 2.0V for precision temperature/humidity sensing. IC Role / Device Role / Timing Role: LTC3100EUD#TRPBF uses boost to generate 3.0V from 2.0–3.0V coin cell, buck to step down to 1.8V, and LDO to filter noise for analog front-end - all with shared thermal pad. Use Value: Integrated anti-ringing and LDO PSRR suppress switching noise coupling into analog measurements; 68°C/W θJA prevents thermal throttling in sealed enclosures. | Use Scenario: Chest-worn ECG/PPG patches powered by thin-film batteries (2.0–3.6V), demanding sub-100µA average system current and simultaneous 1.2V analog, 1.8V digital, and 3.3V radio supplies. IC Role / Device Role / Timing Role: LTC3100EUD#TRPBF configures boost for 3.3V (BLE radio), buck for 1.8V (MCU), and LDO for 1.2V (analog front-end) - with RUNLDO sequenced after VBST reaches regulation. Use Value: Independent soft-start timers (0.8ms boost, 1.3ms buck, 0.3ms LDO) prevent inrush overload on fragile thin-film batteries; output disconnect avoids battery self-discharge during storage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-rail power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65270RGET | Single-input (2.95–6.5V), dual-buck + LDO; no boost stage; 3A buck channels; no sub-1V start-up capability. | Suitable for systems with stable Li-ion input but unable to replace LTC3100EUD#TRPBF in single-cell or energy-harvesting applications. | Select when input is ≥2.95V and boost functionality is unnecessary; avoid for 0.65–1.8V battery inputs. |
| MAX17504ATP+T | High-voltage (4.5–60V) dual-buck controller; external FETs; no integrated boost or LDO; requires 6+ external components per channel. | Targets industrial 12–48V rails; lacks ultra-low-IQ modes and single-chip integration - not viable for portable battery systems. | Choose for wide-input industrial DC-DC needs; not a functional substitute for LTC3100EUD#TRPBF's low-voltage, integrated triple-rail architecture. |
Compared with TPS65270RGET and MAX17504ATP+T, the LTC3100EUD#TRPBF uniquely supports sub-1V start-up, integrates boost+buck+LDO in one QFN, and delivers 15µA Burst Mode IQ - making it irreplaceable in space-constrained, single-cell portable devices where input voltage range and quiescent power are critical.
Availability
LTC3100EUD#TRPBF is available at Aetrix Electronics and suitable for medical instrumentation, bar code readers, and low-power portable electronic devices requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3100EUD#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 its legacy of high-performance analog and power management ICs with rigorous automotive-grade reliability testing and extended temperature validation.
The LTC3100EUD#TRPBF belongs to Linear's ultra-low-voltage power management product line, designed specifically for energy-constrained applications including single-cell battery systems, energy harvesting interfaces, and portable medical diagnostics where start-up voltage, quiescent current, and integration density are paramount.
FAQ
What is the minimum input voltage required to start up the boost converter in the LTC3100EUD#TRPBF?
The LTC3100EUD#TRPBF boost converter starts up at a minimum input voltage of 0.65V (typical) on VINBST, enabled by an independent start-up oscillator. This allows direct operation from partially discharged alkaline or NiMH cells. Once VBST exceeds VINBST by 0.24V, the IC transitions to normal operation and powers itself from VBST - eliminating dependency on the input source for continued regulation. The LTC3100EUD#TRPBF datasheet specifies this as the "Minimum Start-Up Voltage" under Electrical Characteristics.
Can the buck converter in the LTC3100EUD#TRPBF be powered from an independent source instead of the boost output?
Yes, the LTC3100EUD#TRPBF buck converter accepts input from either the boost output (VBST) or an independent 1.8–5.5V supply connected to VINBK. This flexibility enables cascaded operation (e.g., boost → buck) or parallel sourcing (e.g., battery + USB). When using an independent source, the buck stage operates autonomously - its RUNBK pin, PGBK indicator, and feedback loop remain fully functional regardless of boost status. The LTC3100EUD#TRPBF block diagram and Pin Functions section confirm VINBK as a dedicated input terminal.
How does the LTC3100EUD#TRPBF achieve true output disconnect in boost mode?
The LTC3100EUD#TRPBF achieves true output disconnect by controlling the internal P-channel MOSFET synchronous rectifier to prevent body-diode conduction during shutdown. When RUNBST is pulled low, the P-MOSFET gate is driven to block reverse current flow - allowing VBST to fall to 0V without drawing current from VINBST. This feature also enables safe hot-swap of input sources and eliminates inrush current on turn-on. The LTC3100EUD#TRPBF datasheet explicitly states this under "Output Disconnect" in the OPERATION section.
What is the purpose of the MODE pin on the LTC3100EUD#TRPBF, and how does it affect efficiency?
The MODE pin on the LTC3100EUD#TRPBF selects between Burst Mode (MODE ≥ 0.9V or floating) and fixed-frequency operation (MODE < 0.3V). In Burst Mode, both boost and buck converters pulse-skip at light loads, reducing quiescent current to 15µA and maximizing efficiency below ~5mA. In fixed-frequency mode, they maintain 1.5MHz switching regardless of load - lowering output ripple but increasing IQ to 300–500µA. The LTC3100EUD#TRPBF Electrical Characteristics table lists distinct IQ values for each mode, confirming the trade-off between noise and efficiency.
Does the LTC3100EUD#TRPBF include overtemperature protection, and how does it behave?
Yes, the LTC3100EUD#TRPBF includes overtemperature protection that activates at TJ = 125°C (typical), shutting down all regulators until junction temperature falls below the hysteresis threshold. During activation, the device continues to draw current but ceases switching - preventing thermal runaway while allowing passive cooling. The datasheet notes that continuous operation above 125°C may cause permanent degradation. Thermal shutdown is implemented via an internal thermal sensor and shutdown logic block shown in the LTC3100EUD#TRPBF block diagram.
LTC3100EUD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Topology:
- Step-Down (Buck) (1), Step-Up (Boost) (1), Linear (LDO) (1)
- Number of Outputs:
- 3
- Frequency - Switching:
- 1.5MHz
- Voltage/Current - Output 1:
- 0.6V ~ 5.5V, 250mA
- Voltage/Current - Output 2:
- 1.5V ~ 5.25V, 700mA
- Voltage/Current - Output 3:
- 0.6V ~ 5.25V, 100mA
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- Yes
- Voltage - Supply:
- 0.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
LTC3100EUD#TRPBF FAQ
1.How can I place an order for LTC3100EUD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3100EUD#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 LTC3100EUD#TRPBF reliable?
The price and inventory of LTC3100EUD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3100EUD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3100EUD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3100EUD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3100EUD#TRPBF?
LTC3100EUD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3100EUD#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 LTC3100EUD#TRPBF?
For technical support, including LTC3100EUD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3100EUD#TRPBF requirements.
6.How does Aetrix verify that LTC3100EUD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3100EUD#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 LTC3100EUD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3100EUD#TRPBF?
All LTC3100EUD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3100EUD#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 LTC3100EUD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3100EUD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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