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Analog Devices Inc. LT1615ES5-1#TRPBF
- Part No.:
- LT1615ES5-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LT1615ES5-1#TRPBF.pdf
- Description:
- IC REG BOOST SEPIC ADJ TSOT23-5
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LT1615ES5-1#TRPBF 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 34V maximum output capability. It delivers regulated bias voltage for LCDs and low-power portable systems using fixed off-time control and a 250mV VCE(SAT) NPN switch.
For engineers reviewing the LT1615ES5-1#TRPBF datasheet, LT1615ES5-1#TRPBF pinout, LT1615ES5-1#TRPBF application, or LT1615ES5-1#TRPBF equivalent, key selection criteria include its 1V start-up capability, 20µA quiescent current, 1.23V feedback reference, 400ns switch off-time, and compatibility with ceramic output capacitors and Schottky diodes in space-constrained designs.
Technical Context
The LT1615ES5-1#TRPBF implements a constant off-time, hysteretic control scheme with internal bandgap reference and comparator-based feedback regulation. Its 12mV A2 reference sets the 100mA current limit-distinct from the LT1615's 42mV reference-and enables operation down to 1V input while maintaining shutdown current below 1µA.
During light loads, the device enters burst-mode-like operation: the internal circuitry disables when FB ≥ 1.23V, allowing C2 to supply load current until FB drops to ~1.222V (8mV hysteresis), then re-enables switching. Under start-up or short-circuit conditions (FB < 600mV), off-time extends to 1.5µs and current limit reduces to ~70mA to limit power dissipation.
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 - defines maximum inductor peak current and constrains output power in low-voltage boost configurations. |
| Quiescent Current | 20µA active / <1µA shutdown - enables multi-year battery life in always-on sensor or backup circuits. |
| Feedback Reference | 1.23V ±25mV - sets output voltage via external resistor divider (e.g., 20V output requires R1/R2 = 15.3). |
| Switch Off-Time | 400ns - enables use of small inductors (e.g., 4.7–22µH) and high-frequency operation without external timing components. |
| Max Output Voltage | 34V - allows direct generation of LCD bias, PIN diode drive, or dual-rail supplies without transformers. |
| VCE(SAT) | 120mV at 70mA - minimizes conduction loss in low-current, high-VOUT applications like 1-cell-to-3.3V SEPIC. |
Pinout & Package
LT1615ES5-1#TRPBF uses the 5-lead ThinSOT™ (SOT-23 variant) package: 1.75mm × 2.9mm × 1.0mm profile, 0.95mm pitch, lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Collector of internal NPN switch | Connects to inductor and Schottky anode; minimize trace area to reduce EMI and parasitic inductance. |
| GND (Pin 2) | Power and signal ground reference | Must tie directly to local ground plane; serves as return path for switch current and feedback network. |
| FB (Pin 3) | Inverting input of error amplifier | Senses output via resistor divider; 30nA bias current requires high-value resistors (e.g., 1MΩ/130kΩ for 20V). |
| SHDN (Pin 4) | Enable/disable control input | Logic-high (>0.9V) enables operation; logic-low (<0.25V) reduces IQ to <1µA and disconnects FB from internal reference. |
| VIN (Pin 5) | Input power supply | Requires local 4.7µF ceramic bypass capacitor placed adjacent to pin to stabilize input during switch transitions. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower Operation | 20µA operating current enables >10-year battery life in 10µA average-load applications like real-time clocks or memory backup. |
| 1V Input Start-Up | Starts regulation from fully depleted single-cell batteries (e.g., 1.0V alkaline), eliminating need for voltage booster front-end. |
| Fixed Off-Time Control | 400ns minimum off-time ensures stable operation across input/output ratios without compensation networks or external frequency setting. |
| Low-Voltage Feedback Reference | 1.23V reference allows precise output setting with standard resistor tolerances; 8mV hysteresis prevents oscillation near regulation threshold. |
| Integrated 36V Switch | Enables 34V output in simple boost topology-no transformer or external MOSFET required-reducing BOM count and PCB area. |
Applications
| LCD Bias Generation | Single-Cell Portable Power |
|---|---|
Use Scenario: Generating +20V bias for STN or TFT LCD panels in handheld computers or medical displays powered by one Li-ion cell (2.5–4.2V). IC Role / Device Role / Timing Role: Primary DC/DC boost regulator with feedback-controlled output voltage and automatic burst-mode sleep during display idle periods. Use Value: Delivers 12mA at 20V with >70% efficiency across battery discharge curve, enabling compact, transformerless panel power. | Use Scenario: Providing regulated 3.3V from a single 1.0–1.5V alkaline or NiMH cell in wireless sensors or remote controls. IC Role / Device Role / Timing Role: Micropower step-up converter operating in discontinuous conduction mode with adaptive off-time to maintain regulation at ultra-low input. Use Value: Supports 15mA output at 3.3V with 20µA quiescent draw, extending battery life beyond 5 years in low-duty-cycle IoT endpoints. |
| PIN Diode Driver | Dual-Rail ±20V Supply |
Use Scenario: Driving RF PIN diodes requiring 35V reverse bias in portable test equipment or antenna tuning modules. IC Role / Device Role / Timing Role: High-voltage boost converter with low-noise, low-ripple output enabled by 4.7pF feed-forward capacitor in feedback loop. Use Value: Delivers 500µA at 35V with <10mVPP ripple using MBR0540 Schottky and 22µH inductor-no linear post-regulator needed. | Use Scenario: Generating isolated ±20V rails for op-amp biasing or analog front-ends in portable instrumentation. IC Role / Device Role / Timing Role: Core boost controller in charge-pump-assisted dual-output configuration with output disconnect via external FETs. Use Value: Achieves ±20V at 4mA each rail from 1.5–5V input using single inductor and four Schottky diodes-no center-tapped transformer or dual controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar micropower boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1307ES5#TRPBF | 600kHz fixed-frequency PWM; 75mA output; 1.2V min input; no 1V start-up capability. | Higher efficiency above 10mA but cannot start from 1.0V; less suitable for deeply discharged cells. | Choose LT1307ES5#TRPBF for higher continuous load (e.g., 3.3V/75mA) where input stays >1.2V. |
| LT1610CS5#TRPBF | 1.7MHz fixed-frequency; 30mA output; 1V min input; lower max VOUT (15V); different feedback architecture. | Smaller solution size due to higher frequency, but insufficient for >15V outputs like LCD bias. | Choose LT1610CS5#TRPBF for ultra-compact 3V/30mA supplies where board space is critical and VOUT ≤15V. |
Compared with LT1307ES5#TRPBF and LT1610CS5#TRPBF, the LT1615ES5-1#TRPBF uniquely combines 1V start-up, 34V output capability, and 100mA current limit in a single ThinSOT package-making it the only option among the three for single-cell-to-LCD-bias applications requiring both ultra-low VIN and high VOUT.
Availability
LT1615ES5-1#TRPBF is available at Aetrix Electronics and suitable for LCD bias generation, single-cell portable power, PIN diode driver circuits, and dual-rail analog supply applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LT1615ES5-1#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 full product support, documentation, and manufacturing continuity for legacy Linear parts including the LT1615 family.
The LT1615 series was designed specifically for micropower, wide-input-range DC/DC conversion in portable and battery-backed systems-emphasizing ultra-low quiescent current, minimal external component count, and robust operation from near-dead cells.
FAQ
What is the minimum input voltage required for LT1615ES5-1#TRPBF to start switching?
The LT1615ES5-1#TRPBF starts switching at 1.0V input, verified across temperature and process corners per the Electrical Characteristics table. This enables operation from a single exhausted alkaline or NiMH cell. Below 1.0V, the internal bandgap reference fails to activate, preventing regulation. The LT1615ES5-1#TRPBF does not latch or brown-out-it simply ceases switching when VIN drops below the 1.0V threshold.
Can LT1615ES5-1#TRPBF replace LT1615ES5#TRPBF in an existing design?
No-LT1615ES5-1#TRPBF is not a drop-in replacement for LT1615ES5#TRPBF. While pinout and package are identical, the LT1615ES5-1#TRPBF has a 100mA switch current limit and 12mV current-sense threshold versus 350mA and 42mV in the LT1615ES5#TRPBF. Substituting it into a design expecting 350mA peak current will cause premature current limiting, reduced output power, and possible instability. Always verify load requirements before substitution.
What is the recommended output capacitor for LT1615ES5-1#TRPBF in a 20V LCD bias application?
For a 20V LCD bias application, Taiyo Yuden TMK316BJ105 (1µF, 25V X5R, 0603) is explicitly recommended in the Typical Applications section (TA01). Its low ESR (<100mΩ) minimizes output ripple, and its 25V rating provides 25% margin over 20V output. Ceramic dielectrics are mandatory-tantalum or aluminum electrolytics introduce excessive ESR and instability due to the LT1615ES5-1#TRPBF's hysteretic control loop.
Does LT1615ES5-1#TRPBF require an external Schottky diode, and what specifications are critical?
Yes, LT1615ES5-1#TRPBF requires an external Schottky diode. Critical specs are: 30V+ PIV rating (e.g., MBR0530 for 20V outputs), ≤0.4V forward voltage at peak current, and ≥350mA surge rating. The diode conducts during switch off-time and must handle inductor flyback energy. Using a non-Schottky rectifier (e.g., 1N4007) causes severe efficiency loss and thermal failure due to slow recovery and high VF.
How does the 4.7pF feed-forward capacitor improve performance in LT1615ES5-1#TRPBF circuits?
The 4.7pF capacitor placed across the upper feedback resistor (R1) in LT1615ES5-1#TRPBF circuits injects high-frequency feed-forward to counteract output voltage ripple caused by burst-mode switching. It reduces 100kHz–1MHz ripple by >50% without increasing output capacitance-critical for noise-sensitive analog rails. This capacitor is optional but strongly recommended for LCD bias and PIN diode driver applications where low ripple is essential.
LT1615ES5-1#TRPBF 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#TRPBF FAQ
1.How can I place an order for LT1615ES5-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1615ES5-1#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 LT1615ES5-1#TRPBF reliable?
The price and inventory of LT1615ES5-1#TRPBF 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#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1615ES5-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1615ES5-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1615ES5-1#TRPBF?
LT1615ES5-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1615ES5-1#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 LT1615ES5-1#TRPBF?
For technical support, including LT1615ES5-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1615ES5-1#TRPBF requirements.
6.How does Aetrix verify that LT1615ES5-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1615ES5-1#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 LT1615ES5-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1615ES5-1#TRPBF?
All LT1615ES5-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1615ES5-1#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 LT1615ES5-1#TRPBF part is unused and in its original packaging.
Return procedure for LT1615ES5-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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