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Analog Devices Inc. LT1615ES5-1#TRMPBF
- Part No.:
- LT1615ES5-1#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LT1615ES5-1#TRMPBF.pdf
- Description:
- IC REG BOOST SEPIC ADJ TSOT23-5
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LT1615ES5-1#TRMPBF from Analog Devices (formerly Linear Technology) is a micropower step-up DC/DC converter in a 5-lead ThinSOT™ package, designed for single-cell battery applications with 1V minimum input, 100mA switch current limit, and up to 34V output capability. It delivers regulated bias voltage for LCDs, powers low-current sensors, and enables compact portable electronics requiring ultra-low quiescent current (20µA active, 0.5µA shutdown).
For engineers reviewing the LT1615ES5-1#TRMPBF datasheet, LT1615ES5-1#TRMPBF pinout, LT1615ES5-1#TRMPBF application, or LT1615ES5-1#TRMPBF equivalent, key selection criteria include its 1V–15V input range, fixed off-time control architecture, 400ns minimum switch off-time, feedback reference of 1.23V ±25mV, and compatibility with tiny surface-mount inductors and ceramic capacitors in space-constrained designs.
Technical Context
The LT1615ES5-1#TRMPBF implements a constant off-time, current-limited boost topology with internal NPN power switch (VCESAT = 120mV at 70mA). Its feedback comparator features 1.23V trip point and 8mV hysteresis, enabling stable regulation across wide load and temperature ranges.
Operation relies on a bandgap reference (Q1/Q2 + R3/R4), one-shot driver with 400ns off-time (1.5µs during startup/short-circuit), and adaptive current limiting-reducing peak switch current to ~250mA when FB < 600mV to minimize dissipation during fault conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.0V to 15V - supports single alkaline, NiMH, or Li-ion cells without external LDO pre-regulation. |
| Switch Current Limit | 100mA typical - sets maximum inductor ramp current, defining safe operating area for low-power bias generation. |
| Quiescent Current | 20µA active / 0.5µA shutdown - enables multi-year battery life in always-on sensor or backup circuits. |
| Feedback Reference | 1.23V ±25mV - determines output voltage via external resistor divider (VOUT = 1.23 × (1 + R1/R2)). |
| Switch Off-Time | 400ns (normal), 1.5µs (low-FB mode) - controls minimum switching frequency and inductor size; enables use of ≤10µH inductors. |
| Max Output Voltage | 34V - allows direct generation of LCD bias, PIN diode drive, or dual-rail supplies without transformers. |
| Package | 5-Lead ThinSOT™ (SOT-23 variant, 1mm height) - footprint-compatible with standard SOT-23 but optimized for thermal performance in thin portable assemblies. |
Pinout & Package
LT1615ES5-1#TRMPBF uses a 5-lead ThinSOT™ package (JEDEC MO-193, SC-74A compatible), measuring 2.80–3.10mm × 1.50–1.75mm × ≤1.00mm height, with gull-wing leads and exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Collector of internal NPN switch | High-slew node; requires minimal trace area to reduce EMI and parasitic inductance in boost path. |
| GND (Pin 2) | Power and signal ground reference | Must connect directly to local ground plane; serves as return for switch current and feedback reference. |
| FB (Pin 3) | Feedback input to error amplifier | Senses divided output voltage; 30–80nA bias current enables high-resistor-divider networks for precision scaling. |
| SHDN (Pin 4) | Active-high enable control | Drives device into 0.5µA shutdown when <0.25V; enables >0.9V logic-level control without external pull-up. |
| VIN (Pin 5) | Main input supply connection | Requires local 4.7µF ceramic bypass capacitor; accepts 1V–15V unregulated sources including aging batteries. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 20µA quiescent current enables >10-year battery life in 10µA-load backup systems using CR2032 or AA cells. |
| Ultra-low VIN start-up | 1.0V minimum input allows direct interface with single NiMH (1.2V) or deeply discharged Li-ion (≤2.5V) cells. |
| Fixed off-time control | 400ns minimum off-time permits use of 4.7µH–22µH low-profile inductors, reducing board area by >40% vs. 1MHz PWM converters. |
| Integrated 36V switch | Eliminates need for external high-voltage transistors or transformer-based topologies in 20–34V LCD bias applications. |
| Low VCESAT switch | 120mV saturation voltage at 70mA minimizes conduction loss, sustaining >80% efficiency at 1mA–15mA loads typical in display bias rails. |
Applications
| LCD Bias Generation | PIN Diode Driver |
|---|---|
Use Scenario: Generating +20V bias for segment LCDs in handheld medical meters or industrial HMIs powered by single 1.5V alkaline cells. IC Role / Device Role / Timing Role: Primary DC/DC boost regulator providing regulated high-voltage rail; operates in discontinuous conduction mode with burst-like energy delivery. Use Value: Enables direct single-cell operation without voltage doublers or charge pumps, reducing component count by 3–4 parts and improving reliability over discrete solutions. | Use Scenario: Supplying 35V reverse bias to RF PIN diodes in battery-powered antenna switch modules for IoT transceivers. IC Role / Device Role / Timing Role: High-voltage, low-quiescent-current bias generator; shutdown pin synchronizes bias enable with RF transmit timing. Use Value: Delivers precise 35V at 500µA with <1µA standby draw, extending battery life in duty-cycled RF front-ends while maintaining fast turn-on response. |
| Low-Power Sensor Bias | Backup Memory Supply |
Use Scenario: Providing stable 3.3V rail for MEMS accelerometers or gas sensors in asset trackers operating from 1.2V NiMH cells. IC Role / Device Role / Timing Role: Micropower boost converter with shutdown-controlled output; regulates output despite input decay from 1.4V to 1.0V during battery discharge. Use Value: Maintains sensor accuracy down to end-of-life battery voltage, eliminating premature system shutdown and extending usable runtime by 25%. | Use Scenario: Maintaining SRAM or real-time clock (RTC) voltage during main power failure in industrial controllers using supercapacitor hold-up. IC Role / Device Role / Timing Role: Low-leakage (0.5µA shutdown) boost stage that activates only when backup capacitor voltage drops below 2.0V. Use Value: Extends supercapacitor hold-up time by minimizing quiescent drain, supporting >72-hour RTC operation on 0.1F/5.5V backup caps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar micropower boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1610CS5#TRMPBF | 1.7MHz fixed-frequency PWM; 30mA current limit; 1V min input; no shutdown pin. | Higher frequency enables smaller inductors but lower output current; unsuitable for >15mA loads or shutdown-controlled systems. | Select when board space is critical and load current ≤30mA; avoid if shutdown control or >20V output required. |
| TPS61200DRCR | 1.2MHz synchronous boost; 1.8V–5.5V input; 1.2A switch; integrated diode; 55µA IQ. | Higher current and efficiency above 50mA, but requires ≥1.8V input and lacks 1V start-up capability. | Select for higher-current applications (>50mA) with ≥1.8V supply; avoid for single-cell NiMH or deeply discharged Li-ion systems. |
Compared with LT1615ES5-1#TRMPBF, LT1610CS5#TRMPBF offers higher switching frequency but lower current capability and no shutdown function, while TPS61200DRCR provides greater output current and integration at the cost of minimum input voltage compliance and quiescent current penalty-making LT1615ES5-1#TRMPBF uniquely suited for ultra-low-voltage, ultra-low-power, shutdown-enabled bias generation.
Availability
LT1615ES5-1#TRMPBF is available at Aetrix Electronics and suitable for LCD bias generation, PIN diode driver circuits, low-power sensor bias rails, and backup memory supply systems requiring stable component supply across long-lifecycle industrial and portable designs.
Supply support for LT1615ES5-1#TRMPBF 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 LT1615 family.
The LT1615 series belongs to Linear's micropower DC/DC converter product line, engineered specifically for battery-powered portable equipment where minimal quiescent current, single-cell start-up capability, and small solution size are primary design constraints.
FAQ
What is the minimum input voltage required for LT1615ES5-1#TRMPBF to start switching?
The LT1615ES5-1#TRMPBF starts switching at 1.0V input, verified across temperature and process corners per Electrical Characteristics table. This enables direct operation from single NiMH, alkaline, or deeply discharged Li-ion cells without pre-regulation. Below 1.0V, the internal bandgap reference cannot stabilize, preventing reliable regulation. The LT1615ES5-1#TRMPBF maintains regulation down to 1.0V even under load, unlike the LT1615 variant which requires 1.2V minimum.
Does LT1615ES5-1#TRMPBF include an integrated diode?
No, the LT1615ES5-1#TRMPBF does not include an integrated diode. It requires an external Schottky diode (e.g., MBR0530 or CMDSH-3) in the boost path to prevent reverse current flow during switch off-time. This external diode placement allows optimization for voltage rating, forward drop, and thermal performance based on the specific output voltage and load requirements of the LT1615ES5-1#TRMPBF application.
What is the feedback reference voltage tolerance for LT1615ES5-1#TRMPBF?
The LT1615ES5-1#TRMPBF has a feedback reference voltage of 1.23V with a guaranteed tolerance of ±25mV (1.205V to 1.255V) over the full –40°C to 85°C operating temperature range. This tolerance directly impacts output voltage accuracy when using external resistive dividers; for example, a 20V output set with 1.23V reference will vary by ±0.41% due to reference drift alone, independent of resistor tolerance.
Can LT1615ES5-1#TRMPBF be used in SEPIC topology?
Yes, the LT1615ES5-1#TRMPBF can be configured in SEPIC topology, as confirmed in Typical Applications section TA07 (4-Cell to 5V SEPIC Converter and 1-Cell Li-Ion to 3.3V SEPIC Converter). Its constant off-time control and internal NPN switch support both boost and SEPIC configurations. However, SEPIC requires two coupled or uncoupled inductors and additional capacitor; efficiency is typically 5–10% lower than boost mode due to added conduction losses in the second inductor and capacitor.
What is the maximum achievable output voltage with LT1615ES5-1#TRMPBF?
The LT1615ES5-1#TRMPBF supports output voltages up to 34V, limited by the 36V absolute maximum rating of the internal switch collector (SW pin). This is demonstrated in application circuit TA01 (1-Cell Li-Ion to 20V Converter) and TA05 (±20V Dual Output Converter), where outputs of 20V, 35V, and dual ±20V are explicitly validated. Exceeding 34V risks breakdown of the internal NPN transistor and is outside guaranteed operating specifications.
LT1615ES5-1#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Boost, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1V
- Voltage - Input (Max):
- 15V
- Voltage - Output (Min/Fixed):
- 1.23V
- Voltage - Output (Max):
- 34V
- Current - Output:
- 75mA (Switch)
- Frequency - Switching:
- -
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
LT1615ES5-1#TRMPBF FAQ
1.How can I place an order for LT1615ES5-1#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1615ES5-1#TRMPBF 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 LT1615ES5-1#TRMPBF reliable?
The price and inventory of LT1615ES5-1#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1615ES5-1#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT1615ES5-1#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1615ES5-1#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1615ES5-1#TRMPBF?
LT1615ES5-1#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1615ES5-1#TRMPBF 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 LT1615ES5-1#TRMPBF?
For technical support, including LT1615ES5-1#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1615ES5-1#TRMPBF requirements.
6.How does Aetrix verify that LT1615ES5-1#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT1615ES5-1#TRMPBF 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 LT1615ES5-1#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT1615ES5-1#TRMPBF?
All LT1615ES5-1#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1615ES5-1#TRMPBF, 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 LT1615ES5-1#TRMPBF part is unused and in its original packaging.
Return procedure for LT1615ES5-1#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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