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Analog Devices Inc. LT1610IS8#PBF
- Part No.:
- LT1610IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1610IS8#PBF.pdf
- Description:
- IC REG BST SEPIC ADJ 450MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,837
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Product details
Overview
LT1610IS8#PBF from Analog Devices (formerly Linear Technology) is a micropower, fixed-frequency 1.7MHz step-up DC/DC converter optimized for single-cell battery operation. It delivers 3V at 30mA from 1V input, supports up to 28V output, features internal compensation, 30µA quiescent current, and an integrated NPN switch with 300mV VCE(SAT) at 300mA - enabling compact, low-noise boost supplies in portable electronics.
For engineers reviewing the LT1610IS8#PBF datasheet, LT1610IS8#PBF pinout, LT1610IS8#PBF application, or LT1610IS8#PBF equivalent, key selection criteria include minimum input voltage (1V), feedback reference (1.23V), burst-mode efficiency at light load, SO-8 package thermal performance (θJA = 120°C/W), and compatibility with ceramic/tantalum output capacitors in SEPIC or boost topologies.
Technical Context
The LT1610IS8#PBF implements current-mode PWM control with a 1.7MHz oscillator and ramp generator to prevent subharmonic oscillation above 50% duty cycle. Its error amplifier (transconductance = 25 µmhos, gain = 100 V/V) drives the VC pin to regulate output via FB (1.23V reference), while the internal NPN switch enables high-efficiency operation down to 1V input.
Burst Mode™ operation engages below ~1mA load: the IC shuts down core circuitry except the error amplifier and low-battery detector, reducing quiescent current to 30µA and maintaining regulation via low-frequency switching. Shutdown current drops below 1µA when SHDN is grounded.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.7 MHz typical - enables use of tiny inductors (e.g., 4.7 µH) and low-ESR ceramic/tantalum capacitors for minimal board area. |
| Feedback Voltage | 1.23 V ±30 mV - sets regulated output via external resistor divider (VOUT = 1.23 × (1 + R1/R2)); tight tolerance ensures stable output across temperature. |
| Quiescent Current | 30 µA typical (not switching) - extends battery life in always-on, low-duty-cycle applications like pagers and backup systems. |
| Min Input Voltage | 1.0 V - supports operation down to near-dead alkaline or NiMH single-cell batteries, critical for long runtime in portable devices. |
| Max Output Voltage | 28 V - enables high-voltage bias generation for LCDs, sensors, or RF modules without external charge pumps. |
| Switch VCE(SAT) | 300 mV at 300 mA - minimizes conduction loss and improves efficiency in medium-current boost stages (e.g., 3.3V/70mA from 2-cell input). |
| Shutdown Current | <1 µA - ensures negligible battery drain during system sleep, essential for battery-backed memory or real-time clocks. |
Pinout & Package
LT1610IS8#PBF is housed in an 8-lead plastic SO (Small Outline) package (SO-8, narrow 0.150"), with θJA = 120°C/W and operating temperature range of –40°C to +85°C (Industrial grade). Pin 4 (PGND) and Pin 7 (GND) must be tied to separate local ground planes to isolate high-switching-current paths from signal references.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Error amplifier output | Drives compensation network; connect external RC (220kΩ/220pF typical) or tie to COMP for internal compensation - determines loop stability and transient response. |
| FB (Pin 2) | Feedback input | Monitors output via resistive divider; 1.23V reference enables precise output setting; trace area must be minimized to reduce noise coupling. |
| SHDN (Pin 3) | Enable/disable control | Logic-high (>1V) enables operation; grounded disables IC and reduces supply current to <1µA - used for system-level power sequencing. |
| PGND (Pin 4) | Power ground return | Carries high di/dt switch current; must connect directly to local ground plane under IC to minimize EMI and voltage spikes. |
| SW (Pin 5) | Switch node | Connects to inductor/diode junction; high dv/dt requires short, wide traces and minimized loop area to suppress radiated emissions. |
| VIN (Pin 6) | Input supply | Accepts 1V–8V; requires local bypass capacitor (e.g., 22µF tantalum) placed adjacent to pin to stabilize input during switching transitions. |
| GND (Pin 7) | Signal ground | Reference for FB, SHDN, and internal circuitry; tie to same local ground as VC/FB but separate from PGND to avoid noise injection. |
| COMP (Pin 8) | Internal compensation node | Tie to VC for internal RC compensation (50kΩ/50pF); leave floating if using external RC - determines whether compensation is fixed or adjustable. |
Key Features
| Feature | Design Value |
|---|---|
| 1.7MHz fixed-frequency PWM | Enables use of <5 mm² passive components (e.g., 4.7 µH inductor, 22 µF tantalum caps), reducing solution size vs. lower-frequency converters. |
| Internal compensation option | Eliminates two external compensation components when COMP pin is tied to VC - simplifies BOM and layout for cost-sensitive designs. |
| Burst Mode™ operation | Maintains >70% efficiency at 1mA load by cycling full-power bursts, unlike linear regulators which would dissipate excess voltage as heat. |
| Low 300mV VCE(SAT) switch | Reduces conduction loss by ~50% vs. typical 600mV switches at 300mA, improving efficiency in 3.3V/50mA boost applications from 2-cell inputs. |
| 1V minimum input voltage | Supports operation through full discharge of single alkaline/NiMH cells (down to ~0.9V), extending usable battery capacity by 15–20%. |
Applications
| Portable Medical Sensors | Pager Power Management |
|---|---|
Use Scenario: Wearable glucose monitor powered by a single AA alkaline cell requiring regulated 3.3V for MCU and 5V for Bluetooth radio. IC Role / Device Role / Timing Role: Primary step-up converter generating both rails; operates in Burst Mode during sensor sleep (10µA avg. load) and continuous mode during transmission bursts (150mA peak). Use Value: 30µA quiescent current extends battery life to >6 months; 1V start-up ensures operation until cell reaches 0.95V, maximizing energy extraction. | Use Scenario: Two-way pager with LCD display needing +8V AVDD, –8V VOFF, and +24V VON bias from 3.3V rail. IC Role / Device Role / Timing Role: Core boost controller in multi-output TFT LCD bias supply; drives coupled inductor and charge-pump diodes in fixed-frequency mode. Use Value: 28V max output and 1.7MHz switching enable all-ceramic design (0.22µF–4.7µF) with <50mV ripple - eliminating bulkier tantalum caps and improving reliability. |
| Single-Cell Super Capacitor Charger | Industrial Battery Backup System |
Use Scenario: Energy-harvesting node charging a 10F supercapacitor from a single NiMH cell to power a microcontroller during mains outage. IC Role / Device Role / Timing Role: Constant-voltage charger regulating output to 4.5V; uses FB divider and SHDN for charge termination logic. Use Value: 1V min input allows charging even as cell discharges to 1.05V; 300mV VCE(SAT) limits thermal rise during 20mA constant-current phase. | Use Scenario: PLC I/O module with nonvolatile RAM requiring 3.3V backup during 100ms AC dropout; powered by primary 5V rail with Li-ion backup cell. IC Role / Device Role / Timing Role: Standby boost converter activated only during main supply failure; regulated 3.3V output sustains SRAM for >72 hours. Use Value: <1µA shutdown current prevents measurable drain on backup cell over years; SO-8 package supports conformal coating for industrial humidity resistance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1307CS8#PBF | 600kHz switching frequency; 3.3V/75mA from 1-cell; no internal compensation; SO-8 package | Lower frequency requires larger inductors/caps; higher quiescent current (65µA); suited for less space-constrained, cost-sensitive designs | Select LTC1307 if board area is not critical and 600kHz EMI profile is preferred over 1.7MHz. |
| LT1613CS3#TRMPBF | SOT-23-6 package; 1.4MHz; 3.3V→5V at 200mA; integrated Schottky; no PGND/GND separation | Smaller footprint but limited to 5V output; lacks PGND/GND isolation for high-EMI environments; lower max output voltage (12V) | Choose LT1613 only for ultra-compact 5V boost where SO-8 layout is impractical and 28V capability is unnecessary. |
Compared with LTC1307 and LT1613, the LT1610IS8#PBF offers superior 1V start-up, lower quiescent current, higher output voltage headroom, and dedicated PGND/GND separation - making it optimal for industrial battery backup and medical sensor applications demanding robust low-voltage operation and EMI control.
Availability
LT1610IS8#PBF is available at Aetrix Electronics and suitable for portable medical sensors, pager power management, single-cell super capacitor chargers, and industrial battery backup systems requiring stable component supply with guaranteed Industrial-grade temperature performance (–40°C to +85°C).
Supply support for LT1610IS8#PBF 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, datasheets, and application notes for legacy Linear parts including the LT1610 series.
The LT1610IS8#PBF belongs to Linear's micropower DC/DC converter product line, designed specifically for battery-powered portable equipment where ultra-low quiescent current, single-cell start-up, and small solution size are critical requirements.
FAQ
What is the minimum input voltage required for the LT1610IS8#PBF to start switching?
The LT1610IS8#PBF starts switching at a minimum input voltage of 1.0 V (typical) across the full industrial temperature range (–40°C to +85°C). At –40°C, the guaranteed minimum is 1.25 V per datasheet specifications. This enables reliable operation from nearly depleted single-cell alkaline or NiMH batteries, extending usable battery life beyond conventional boost converters.
Can the LT1610IS8#PBF be used in SEPIC topology, and what layout considerations apply?
Yes, the LT1610IS8#PBF supports SEPIC topology, as confirmed in Figure 4 and Figure 5 of its datasheet for Li-ion to 3.3V conversion. Critical layout practices include separating PGND (Pin 4) and GND (Pin 7) ground returns, placing C2's negative terminal adjacent to PGND, and using multiple vias to tie the PGND copper to the main ground plane at a single point - minimizing high-di/dt noise coupling into sensitive analog nodes like FB and VC.
Does the LT1610IS8#PBF require external compensation components, or is internal compensation sufficient?
The LT1610IS8#PBF offers dual compensation options: internal (tie COMP pin to VC) or external (RC network from VC to ground). Internal compensation eliminates two external parts and is sufficient for standard boost/SEPIC designs with typical output capacitors (e.g., 22 µF tantalum). External compensation (e.g., 220kΩ/220pF) is recommended when using low-ESR ceramic output capacitors to ensure adequate phase margin and stable transient response.
What is the maximum output voltage achievable with the LT1610IS8#PBF, and how is it limited?
The LT1610IS8#PBF supports output voltages up to 28 V, as specified in the "Features" section and absolute maximum ratings (SW pin voltage ≤ 30 V). This limit is enforced by the breakdown rating of the internal NPN switch and external diode selection - for example, the MBR0520 Schottky diode (20 V) must be replaced with MBR0530 (30 V) or MBR0540 (40 V) when targeting outputs above 20 V to prevent reverse-voltage failure.
How does Burst Mode™ operation improve efficiency at light loads in the LT1610IS8#PBF?
Burst Mode™ operation in the LT1610IS8#PBF improves light-load efficiency by disabling the oscillator, driver, and power stage while retaining only the error amplifier and reference - reducing total current draw to 30 µA. When load demand increases, the error amplifier triggers full-power switching bursts to recharge the output capacitor, maintaining regulation with >70% efficiency even at 1 mA load - far exceeding linear regulators or non-burst-mode switchers.
LT1610IS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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):
- 0.9V
- Voltage - Input (Max):
- 8V
- Voltage - Output (Min/Fixed):
- 1.23V
- Voltage - Output (Max):
- 30V (Switch)
- Current - Output:
- 450mA (Switch)
- Frequency - Switching:
- 1.7MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1610IS8#PBF FAQ
1.How can I place an order for LT1610IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1610IS8#PBF 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 LT1610IS8#PBF reliable?
The price and inventory of LT1610IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1610IS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1610IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1610IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1610IS8#PBF?
LT1610IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1610IS8#PBF 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 LT1610IS8#PBF?
For technical support, including LT1610IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1610IS8#PBF requirements.
6.How does Aetrix verify that LT1610IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1610IS8#PBF 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 LT1610IS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1610IS8#PBF?
All LT1610IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1610IS8#PBF, 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 LT1610IS8#PBF part is unused and in its original packaging.
Return procedure for LT1610IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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