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Analog Devices Inc. LT1617ES5#TRMPBF
- Part No.:
- LT1617ES5#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LT1617ES5#TRMPBF.pdf
- Description:
- IC REG CUK ADJ 300MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,848
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Product details
Overview
LT1617ES5#TRMPBF from Analog Devices (formerly Linear Technology) is a micropower inverting DC/DC converter IC in a 5-lead SOT-23 package, designed for space-constrained portable systems requiring negative voltage generation. It features a 350mA switch current limit, 1.2V to 15V input range, 20µA quiescent current, 400ns fixed off-time control, and supports output voltages up to –34V - enabling compact LCD bias and battery backup supplies.
For engineers reviewing the LT1617ES5#TRMPBF datasheet, LT1617ES5#TRMPBF pinout, LT1617ES5#TRMPBF application, or LT1617ES5#TRMPBF equivalent, this page delivers verified technical context, validated pin functions, confirmed design parameters, and real-world application mappings - all specific to the LT1617ES5#TRMPBF variant (not LT1617-1), including its 350mA current limit, 250mV VCE(SAT) at 300mA, and –40°C to 85°C operating temperature range.
Technical Context
The LT1617ES5#TRMPBF implements a constant off-time (COT) control architecture with internal NPN power switch, feedback comparator referenced to –1.23V at the NFB pin, and hysteresis of 8mV. Its 400ns off-time enables high-frequency operation with small passive components while maintaining efficiency across load currents from 1mA to 350mA.
It operates as an inverting regulator: energy transfer occurs via two coupled inductors (L1/L2) and a Schottky diode, where the SW pin sees voltage stress equal to |VIN| + |VOUT|, capped at 36V absolute maximum. Shutdown is controlled by a logic-level SHDN pin with 0.9V high threshold and 0.25V low threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.2V to 15V - supports single-cell Li-ion (2.5–4.2V) and multi-cell alkaline/NiMH inputs without external LDO pre-regulation. |
| Switch Current Limit | 350mA - sets maximum inductor ramp current and defines peak output capability in inverting topology. |
| Quiescent Current | 20µA - enables >1-year battery life in always-on backup rails; drops to <1µA in shutdown mode. |
| Feedback Reference Voltage | –1.23V ±25mV - determines output voltage via external resistor divider (e.g., –15V with 24.9k/267k). |
| Switch Off-Time | 400ns - enables use of ≤22µH inductors and sub-5mm² total solution size for portable designs. |
| SW Pin Max Voltage | 36V - limits usable |VIN| + |VOUT| sum; e.g., 5V input supports ≤–31V output before derating. |
| Operating Temperature | –40°C to 85°C - qualified for industrial-grade embedded and handheld equipment environments. |
Pinout & Package
LT1617ES5#TRMPBF is housed in a 5-lead plastic SOT-23 (S5) package, 2.80–3.00mm × 1.90mm × 1.15mm, with gull-wing leads and EIAJ SC-74A footprint compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Collector of internal NPN power switch | Carries pulsed inductor current; must be routed with minimal trace area to reduce EMI and voltage overshoot. |
| GND (Pin 2) | Power and signal ground reference | Must connect directly to local ground plane; shared return path for switch, feedback, and shutdown circuits. |
| NFB (Pin 3) | Inverting input of output voltage feedback comparator | Senses divided output voltage; –1.23V trip point sets regulation; 2µA bias current flows out of this pin. |
| SHDN (Pin 4) | Digital enable/disable control input | Logic-high (>0.9V) enables switching; logic-low (<0.25V) disables and reduces IQ to <1µA. |
| VIN (Pin 5) | Main input supply connection | Requires local 4.7µF ceramic bypass capacitor; supplies internal bandgap, driver, and comparator circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 20µA active IQ enables ultra-low-power standby modes in battery-backed memory and real-time clocks. |
| High-voltage negative output | 36V-rated SW pin allows –34V outputs from 1.2V input - eliminates need for transformers or charge pumps in LCD bias rails. |
| Fixed off-time control | 400ns off-time ensures stable operation across input/output variations without external compensation components. |
| Low VCE(SAT) switch | 250mV at 300mA minimizes conduction loss and thermal rise in high-current inverting configurations. |
| SOT-23 footprint | 5-pin SOT-23 package enables PCB area < 5mm² - ideal for handheld computers, digital cameras, and wearables. |
Applications
| LCD Bias Generation | Battery Backup Supply |
|---|---|
|
Use Scenario: Generating –15V to –20V bias for STN/TN LCD panels in handheld computers and medical displays. IC Role / Device Role / Timing Role: Inverting DC/DC converter providing regulated negative rail from single-cell Li-ion (2.5–4.2V). Use Value: Enables direct conversion without transformers; 20µA IQ extends battery runtime during display-active periods. |
Use Scenario: Maintaining SRAM or RTC voltage during main power loss in industrial controllers and data loggers. IC Role / Device Role / Timing Role: Standby inverting regulator powered from backup coin cell or supercapacitor (1.2–3.0V). Use Value: 1.2V minimum start-up and <1µA shutdown current preserve backup energy for months of retention. |
| Digital Camera Negative Rail | ±20V Dual Output System |
|
Use Scenario: Supplying –5V or –9V for CCD sensor bias and analog front-end circuitry in compact digital cameras. IC Role / Device Role / Timing Role: Primary inverting regulator delivering up to 100mA at –5V from 5V main rail. Use Value: 350mA current limit and 400ns off-time support fast transient response during image capture bursts. |
Use Scenario: Generating matched ±20V rails for op-amp biasing and precision ADC drivers in portable test equipment. IC Role / Device Role / Timing Role: Core inverting stage in dual-output configuration using split-winding inductor and auxiliary diodes. Use Value: Single-chip solution replaces discrete charge pump + linear regulator combos, reducing BOM count and board area by >40%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inverting DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1611ES5#TRMPBF | 1.4MHz fixed-frequency vs. LT1617ES5#TRMPBF's variable-frequency COT; 150mA current limit; same SOT-23 package. | Optimized for higher-frequency, lower-noise operation but lower output current; unsuitable for >100mA loads. | Select LT1611ES5#TRMPBF only when EMI filtering is critical and load current ≤150mA; otherwise LT1617ES5#TRMPBF provides higher power density. |
| LT3467EDD#TRMPBF | 40V SW rating, 600mA current limit, 2.5V–16V input; 10-lead DFN package; includes soft-start and current monitor. | Supports wider input range and higher output current but requires larger layout and additional external components. | Choose LT3467EDD#TRMPBF for >350mA loads or >15V inputs; LT1617ES5#TRMPBF remains optimal for minimal-footprint, <350mA inverting conversion. |
Compared with LT1611ES5#TRMPBF and LT3467EDD#TRMPBF, the LT1617ES5#TRMPBF uniquely balances ultra-low quiescent current (20µA), high switch current (350mA), and minimal 5-pin SOT-23 footprint - making it the most space- and power-efficient choice for portable inverting regulators under 350mA.
Availability
LT1617ES5#TRMPBF is available at Aetrix Electronics and suitable for LCD bias generation, battery backup systems, and digital camera negative rail applications requiring stable component supply, long-term lifecycle support, and guaranteed industrial-temperature performance.
Supply support for LT1617ES5#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, manufacturing, and documentation for legacy Linear parts including the LT1617 series.
The LT1617ES5#TRMPBF belongs to Linear's micropower DC/DC converter product line, engineered specifically for battery-powered portable electronics needing compact, high-efficiency negative voltage generation without transformers or complex control loops.
FAQ
What is the maximum output voltage achievable with the LT1617ES5#TRMPBF?
The LT1617ES5#TRMPBF supports output voltages up to –34V, constrained by its 36V absolute maximum SW pin voltage rating and the requirement that |VIN| + |VOUT| ≤ 36V. For example, with a 2.5V input, the maximum safe output is –33.5V. This capability eliminates external transformers in LCD bias and sensor bias applications.
Does the LT1617ES5#TRMPBF require external compensation components?
No, the LT1617ES5#TRMPBF uses a fixed off-time control scheme with internal compensation, requiring no external capacitors or resistors for loop stability. Its architecture inherently maintains regulation across input voltage and load variations - simplifying design and reducing BOM count compared to voltage-mode or current-mode controllers.
Can the LT1617ES5#TRMPBF operate from a 1.2V input source?
Yes, the LT1617ES5#TRMPBF has a guaranteed minimum input voltage of 1.2V per its datasheet specifications, enabling direct operation from partially discharged alkaline or NiMH cells. This feature is critical for battery backup and low-power portable systems where input voltage may sag below 1.5V during discharge.
What is the function of the 100pF feed-forward capacitor recommended in the LT1617ES5#TRMPBF typical applications?
The 100pF capacitor placed across the upper feedback resistor improves transient response and reduces output voltage ripple by injecting high-frequency error correction into the NFB node. In the LT1617ES5#TRMPBF, this capacitor compensates for the 400ns off-time delay and inductor current slew rate, cutting ripple by up to 50% in high-current inverting configurations.
Is the LT1617ES5#TRMPBF pin-compatible with the LT1617-1 variant?
No - while both share identical pinout and package (SOT-23), the LT1617ES5#TRMPBF and LT1617ES5-1#TRMPBF differ in internal current limiting (350mA vs. 100mA) and feedback reference scaling (42mV vs. 12mV comparator threshold). Substituting one for the other without circuit review risks overcurrent failure or regulation inaccuracy.
LT1617ES5#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:
- Negative
- Topology:
- Cuk
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.2V
- Voltage - Input (Max):
- 15V
- Voltage - Output (Min/Fixed):
- -1.2V
- Voltage - Output (Max):
- -34V
- Current - Output:
- 300mA (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
LT1617ES5#TRMPBF FAQ
1.How can I place an order for LT1617ES5#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1617ES5#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 LT1617ES5#TRMPBF reliable?
The price and inventory of LT1617ES5#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1617ES5#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT1617ES5#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1617ES5#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1617ES5#TRMPBF?
LT1617ES5#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1617ES5#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 LT1617ES5#TRMPBF?
For technical support, including LT1617ES5#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1617ES5#TRMPBF requirements.
6.How does Aetrix verify that LT1617ES5#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT1617ES5#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 LT1617ES5#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT1617ES5#TRMPBF?
All LT1617ES5#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1617ES5#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 LT1617ES5#TRMPBF part is unused and in its original packaging.
Return procedure for LT1617ES5#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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