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Analog Devices Inc. LT1612ES8#TRPBF
- Part No.:
- LT1612ES8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1612ES8#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 500MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,333
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Product details
Overview
LT1612ES8#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous step-down DC/DC converter optimized for low-input-voltage portable power systems. It operates from 2V to 5.5V input, delivers up to 500mA output current, features an internal 0.45Ω high-side switch and 0.45Ω synchronous rectifier, uses fixed 800kHz PWM switching, and maintains regulation down to 620mV output via its precision feedback reference - ideal for Li-ion–powered 1.2V–3.3V point-of-load conversion.
For engineers reviewing the LT1612ES8#TRPBF datasheet, LT1612ES8#TRPBF pinout, LT1612ES8#TRPBF application, or LT1612ES8#TRPBF equivalent, key selection criteria include minimum 2V start-up capability, Burst Mode™ operation for <160µA no-load quiescent current, programmable MODE pin control for noise-sensitive continuous-mode operation, and compatibility with ceramic input/output capacitors in space-constrained battery-powered designs.
Technical Context
The LT1612ES8#TRPBF implements current-mode control with an internal 800kHz oscillator, cycle-by-cycle peak current limiting, and slope compensation for stability across wide duty cycles. Its error amplifier drives the VC pin to modulate switch conduction time, while the FB pin senses output voltage against a 620mV reference to maintain regulation.
Burst Mode™ operation is enabled when the MODE pin is grounded or floating, disabling the oscillator during light loads to reduce quiescent current to 160µA; pulling MODE ≥2V forces continuous switching for low-noise, ripple-sensitive applications. The BOOST pin supplies the gate driver with VIN + 1.5V minimum, enabling efficient synchronous rectification without external diodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2V to 5.5V - supports single-cell Li-ion (2.7–4.2V), 2-cell alkaline (2–3.2V), and regulated 3.3V/5V rails. |
| Output Voltage Range | 620mV to VIN - set by external resistor divider; enables sub-1V core supply generation. |
| Switching Frequency | Fixed 800kHz (±100kHz) - allows use of small 10µH inductors and ceramic capacitors ≤10µF. |
| Max Output Current | 500mA - sustained under thermal limits (θJA = 120°C/W in SO-8 package). |
| Quiescent Current | 160µA in Burst Mode™ - extends battery life in standby; <1µA in shutdown. |
| Feedback Reference | 620mV ±15mV - high-accuracy reference enables tight output tolerance with standard 1% resistors. |
| Internal Switch RDS(on) | 0.45Ω high-side + 0.45Ω synchronous rectifier - eliminates Schottky loss, improves efficiency >85% at 500mA. |
Pinout & Package
LT1612ES8#TRPBF is housed in an 8-lead plastic SO (Small Outline) package (S8), 0.150" wide, with standard JEDEC MS-012AC footprint and 1.27mm pitch. Thermal resistance θJA = 120°C/W enables 500mA operation without forced airflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Error amplifier output / compensation node | Drives RC network for loop stability; voltage sets current limit threshold; grounding disables switching. |
| FB (Pin 2) | Feedback input | Connects to resistor divider tap; regulates VOUT = 0.62V × (1 + R1/R2); bias current flows out (–7nA typical). |
| VIN (Pin 3) | Main power input | Supplies internal circuitry and high-side switch; requires local 0.1µF ceramic bypass within 5mm. |
| GND (Pin 4) | Power and signal ground | Single-point connection to PCB ground plane minimizes dI/dt noise coupling into feedback path. |
| SW (Pin 5) | Switch node | Connects to inductor and boost capacitor; high dv/dt node - minimize trace area to reduce EMI. |
| BOOST (Pin 6) | Bootstrap supply | Must be ≥VIN + 1.5V; powers gate driver for synchronous rectifier; connect 0.1µF ceramic capacitor. |
| MODE (Pin 7) | Burst Mode™ enable/disable | Ground or float → Burst Mode™ (high efficiency, ~30mVP-P ripple); ≥2V → continuous mode (low noise). |
| SHDN (Pin 8) | Shutdown control | ≤0.2V → shutdown (<1µA IQ); 2V–5.5V → active; 10–45µA input current over operating range. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated 0.45Ω NMOS rectifier eliminates external Schottky diode, raising efficiency by 8–12% vs asynchronous designs. |
| Ultra-low start-up voltage | 2V minimum VIN enables direct regulation from depleted single-cell Li-ion or two alkaline cells without pre-bias. |
| Programmable light-load mode | MODE pin selects between Burst Mode™ (160µA IQ) and forced continuous mode - critical for noise-sensitive RF/analog circuits. |
| Ceramic-capacitor compatible | No ESR requirement on input/output caps - supports compact, low-profile 0402/0603 MLCCs instead of bulkier tantalum or electrolytic. |
| Thermal robustness in SO-8 | θJA = 120°C/W allows full 500mA load at 70°C ambient without derating or heatsinking in standard PCB layouts. |
Applications
| Portable Medical Sensors | Lithium-Ion Powered IoT Nodes |
|---|---|
|
Use Scenario: Wearable ECG patch powered by single Li-ion cell (2.7–4.2V), requiring stable 1.8V for MCU and 3.3V for BLE radio. IC Role / Device Role / Timing Role: Primary step-down regulator delivering dual outputs via cascaded stages; manages dynamic load transitions during radio transmit bursts. Use Value: 160µA Burst Mode™ quiescent current extends battery life to >1 year in sleep mode; 800kHz switching avoids interference with 2.4GHz ISM band. |
Use Scenario: Battery-operated environmental sensor node using 2× AA alkaline cells (2.0–3.2V) powering ultra-low-power microcontroller and LoRa transceiver. IC Role / Device Role / Timing Role: Main DC/DC converter stepping 2.0–3.2V input to regulated 3.0V system rail; handles intermittent 100mA transmit peaks. Use Value: 2V minimum input ensures full utilization of battery capacity down to end-of-life; ceramic capacitor compatibility reduces BOM count and board area. |
| Industrial Handheld Terminals | Low-Voltage FPGA Core Supplies |
|
Use Scenario: Ruggedized barcode scanner with cold-temperature operation (–20°C), powered by NiMH pack (2.4–3.6V), needing clean 1.2V for processor core. IC Role / Device Role / Timing Role: High-efficiency buck converter supplying processor Vcore; MODE pin tied high to suppress low-frequency ripple during display refresh. Use Value: Continuous-mode operation eliminates 10–100Hz ripple that could interfere with touch-screen digitizer; –40°C to 85°C guaranteed operation. |
Use Scenario: Configurable logic module requiring precise 0.9V core supply from 2.5V intermediate rail, with fast transient response to logic state changes. IC Role / Device Role / Timing Role: Point-of-load regulator generating FPGA VCCINT; leverages current-mode control for <10µs load-step recovery. Use Value: 620mV reference enables accurate 0.9V output using standard 1% resistors; VC pin allows custom compensation for optimal phase margin with low-ESR ceramics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1707 | Higher VIN range (2.65–8.5V), lower IQ (10µA), but only 500mA rated in thermally constrained SOT-23. | Not suitable for ≤2.5V inputs; better for higher-input industrial rails where size is critical. | Choose LTC1707 only if input exceeds 2.65V and PCB space is limited to SOT-23 footprint. |
| LTC3404 | 1.4MHz switching, 10µA IQ, same 500mA rating, but requires external MOSFETs and lacks integrated synchronous rectifier. | Needs external high-side/low-side FETs and drivers - increases BOM cost and layout complexity. | Select LTC3404 only when 1.4MHz operation is mandatory and discrete FET optimization justifies added design effort. |
Compared with LTC1707 and LTC3404, the LT1612ES8#TRPBF uniquely combines 2V start-up capability, fully integrated synchronous switches, and SO-8 thermal performance - making it the only drop-in solution for space-constrained, ultra-low-input-voltage battery systems requiring ≤500mA.
Availability
LT1612ES8#TRPBF is available at Aetrix Electronics and suitable for portable medical sensors, lithium-ion–powered IoT nodes, industrial handheld terminals, low-voltage FPGA core supplies, and battery-backed real-time clock modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1612ES8#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, power management, and mixed-signal ICs for precision, reliability, and efficiency-critical applications.
The LT1612ES8#TRPBF belongs to Linear's legacy µPower synchronous buck regulator family, designed specifically for battery-powered portable electronics where minimal input voltage, low quiescent current, and ceramic-capacitor compatibility are essential.
FAQ
What is the minimum input voltage required for LT1612ES8#TRPBF to start switching?
The LT1612ES8#TRPBF begins switching at an input voltage as low as 2V, enabling operation directly from nearly depleted single-cell Li-ion batteries or two alkaline cells. This 2V start-up threshold is guaranteed over the full –40°C to 85°C temperature range and is independent of output voltage setting. Below 2V, the device remains in undervoltage lockout and draws <1µA in shutdown.
How does the MODE pin affect LT1612ES8#TRPBF efficiency and output ripple?
When the MODE pin of the LT1612ES8#TRPBF is grounded or left floating, the device enters Burst Mode™ operation - reducing no-load quiescent current to 160µA but introducing ~30mVP-P low-frequency output ripple. Pulling MODE ≥2V forces continuous 800kHz switching, eliminating low-frequency ripple at the expense of higher light-load current (≈2mA). This trade-off is user-selectable per system noise requirements.
Can LT1612ES8#TRPBF regulate output voltages below 1V?
Yes - the LT1612ES8#TRPBF supports output voltages as low as its 620mV internal feedback reference. Using a resistor divider with R2 = 100kΩ and R1 = 50kΩ yields VOUT = 0.62V × (1 + 50k/100k) = 0.93V. The device maintains regulation and stability down to 0.9V with appropriate ceramic output capacitance and compensation, as verified in Figure TA09 of the official datasheet.
What is the maximum output current capability of LT1612ES8#TRPBF in SO-8 package?
The LT1612ES8#TRPBF delivers up to 500mA continuous output current in its 8-lead SO package when mounted on a standard 2-layer PCB with 1in² copper pour and ambient temperature ≤70°C. This rating assumes proper thermal layout: short, wide traces to GND and VIN, minimal SW node area, and direct GND connection beneath the IC. Derating is required above 70°C ambient due to θJA = 120°C/W.
Does LT1612ES8#TRPBF require an external Schottky diode?
No - the LT1612ES8#TRPBF integrates both high-side and synchronous rectifier MOSFETs, eliminating the need for an external Schottky diode. Its internal 0.45Ω NMOS rectifier replaces the diode, reducing conduction loss and improving full-load efficiency by up to 12% compared to asynchronous buck converters. No external rectifier or bootstrap diode is required.
LT1612ES8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.62V
- Voltage - Output (Max):
- 4.95V
- Current - Output:
- 500mA
- Frequency - Switching:
- 800kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1612ES8#TRPBF FAQ
1.How can I place an order for LT1612ES8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1612ES8#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 LT1612ES8#TRPBF reliable?
The price and inventory of LT1612ES8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1612ES8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1612ES8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1612ES8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1612ES8#TRPBF?
LT1612ES8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1612ES8#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 LT1612ES8#TRPBF?
For technical support, including LT1612ES8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1612ES8#TRPBF requirements.
6.How does Aetrix verify that LT1612ES8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1612ES8#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 LT1612ES8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1612ES8#TRPBF?
All LT1612ES8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1612ES8#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 LT1612ES8#TRPBF part is unused and in its original packaging.
Return procedure for LT1612ES8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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