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Analog Devices Inc. LT1610CS8#PBF
- Part No.:
- LT1610CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1610CS8#PBF.pdf
- Description:
- IC REG BST SEPIC ADJ 450MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:321
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Product details
Overview
LT1610CS8#PBF from Analog Devices (formerly Linear Technology) is a micropower, fixed-frequency 1.7MHz step-up DC/DC converter optimized for single-cell battery systems. It operates from as low as 1V input, delivers up to 28V output, supports 300mA switch current with 300mV VCE(SAT), and achieves 3V at 30mA from a 1V source - ideal for space-constrained portable electronics requiring high efficiency at light loads.
For engineers reviewing the LT1610CS8#PBF datasheet, LT1610CS8#PBF pinout, LT1610CS8#PBF application, or LT1610CS8#PBF equivalent, key selection criteria include its 1.23V feedback reference, internal compensation capability, Burst Mode™ operation for sub-30µA quiescent current, and compatibility with tiny inductors and ceramic/tantalum output capacitors in 8-lead SO package.
Technical Context
The LT1610CS8#PBF employs current-mode PWM control with a 1.7MHz oscillator and integrated ramp generator to prevent subharmonic oscillation above 50% duty cycle. Its error amplifier drives the VC pin, which directly controls peak switch current via comparator A2 and an RS flip-flop, enabling precise output regulation across wide input ranges.
Burst Mode™ operation engages automatically at light load: when FB voltage rises above 1.23V, the hysteretic comparator A1 disables most circuitry except the error amplifier and bias network, reducing quiescent current to 30µA while 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 | 1.7MHz typical - enables use of compact 4.7µH inductors and small ceramic/tantalum capacitors, minimizing board area. |
| Feedback Voltage | 1.23V ±30mV - sets regulated output via external resistor divider (VOUT = 1.23V × (1 + R1/R2)), stable over temperature and line. |
| Quiescent Current | 30µA typical (non-switching) - extends battery life in standby or low-duty-cycle applications like pagers and backup supplies. |
| Min Operating Voltage | 1.0V minimum - supports operation down to near-dead alkaline or NiMH single-cell batteries without brownout. |
| Switch VCE(SAT) | 300mV at 300mA - reduces conduction loss and improves efficiency in high-current boost stages (e.g., 5V@200mA from 3.3V). |
| Output Voltage Range | Up to 28V - enables LCD bias generation (e.g., +8V/–8V/24V) and higher-voltage peripherals from low-input sources. |
| Shutdown Current | <1µA - ensures negligible battery drain during system sleep or storage mode. |
Pinout & Package
LT1610CS8#PBF is housed in an 8-lead plastic SO (Small Outline) package, 0.150" wide, with standard JEDEC MS-012AC footprint and 1.27mm lead pitch. Thermal resistance θJA = 160°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Error amplifier output | Drives internal switch current limit; connects to external RC compensation or COMP pin for stability tuning. |
| FB (Pin 2) | Feedback input | Senses output voltage divider; 1.23V reference enables precise regulation; sensitive to noise - minimize trace area. |
| SHDN (Pin 3) | Enable/disable control | Logic-high (>1V) enables operation; grounded disables IC and reduces current to <1µA. |
| PGND (Pin 4) | Power ground return | Carries high di/dt switch current - tie directly to local ground plane to minimize EMI and voltage spikes. |
| SW (Pin 5) | Switch node | Connects to inductor and diode anode; high dv/dt node - minimize trace length and loop area to reduce radiation. |
| VIN (Pin 6) | Main input supply | Accepts 1V–8V; requires local bypass capacitor (e.g., 22µF tantalum) placed adjacent to pin. |
| GND (Pin 7) | Signal ground | Reference for error amp and logic - tie to same ground plane as PGND but avoid sharing high-current paths. |
| COMP (Pin 8) | Internal compensation tap | Tie to VC for simplified design with built-in 50kΩ/50pF network; float if using external RC compensation. |
Key Features
| Feature | Design Value |
|---|---|
| 1.7MHz fixed-frequency PWM | Enables use of <5µH inductors and <22µF output capacitors - critical for ultra-compact portable designs. |
| Internal compensation network | Eliminates two external components (RC network) when COMP pin is tied to VC - reduces BOM count and layout complexity. |
| Burst Mode™ operation | Maintains >70% efficiency at 1mA load by cycling on/off - extends battery runtime in intermittent-use devices. |
| Low 300mV VCE(SAT) NPN switch | Delivers 300mA peak current with minimal conduction loss - improves thermal performance and full-load efficiency. |
| 1.23V precision feedback reference | Ensures ±2.5% output accuracy over temperature and line - suitable for regulated bias rails in LCD and sensor modules. |
Applications
| Pagers & Cordless Phones | LCD Bias Generation |
|---|---|
|
Use Scenario: Powering RF front-end and baseband ICs in battery-operated pagers and cordless handsets with single AA/AAA cells. IC Role / Device Role / Timing Role: Step-up converter generating stable 3V or 5V rail from 1V–1.5V alkaline input, supporting burst-mode transmission cycles. Use Value: 30µA quiescent current extends standby time to weeks; 1.7MHz switching avoids audible noise and simplifies EMI filtering. |
Use Scenario: Generating positive, negative, and high-voltage rails (e.g., +8V, –8V, +24V) for TFT-LCD panel drivers. IC Role / Device Role / Timing Role: Core boost controller in multi-output charge-pump-assisted bias supply, using all-ceramic capacitors for low profile. Use Value: 28V max output and stable 1.23V reference enable accurate, ripple-sensitive AVDD/VON/VOFF rails; internal compensation reduces component count. |
| Battery Backup Systems | Portable Medical Sensors |
|
Use Scenario: Maintaining real-time clock (RTC), SRAM, or microcontroller state during main power failure using supercapacitor or coin cell. IC Role / Device Role / Timing Role: Low-quiescent boost regulator charging supercapacitor to 4.5V or sustaining 3.3V rail from 1.2V backup source. Use Value: Sub-1µA shutdown current prevents backup energy depletion; 1V start-up ensures operation even after deep discharge. |
Use Scenario: Powering low-power analog front-ends (AFE), ADCs, and wireless transceivers in handheld glucose meters or pulse oximeters. IC Role / Device Role / Timing Role: Primary DC/DC source converting single-cell 1.2V NiMH to regulated 3.3V for signal chain and BLE radio. Use Value: High light-load efficiency (>75% at 100µA) preserves battery life during sensor sampling intervals; SO-8 package eases hand-soldering in low-volume production. |
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 |
|---|---|---|---|
| LT1307CS8#PBF | 600kHz switching frequency; lower max output voltage (20V); no Burst Mode - higher 100µA quiescent current. | Better suited for cost-sensitive, non-audio-sensitive applications where size is less constrained and light-load efficiency is secondary. | Select LT1307CS8#PBF only if 1.7MHz EMI is problematic and 30µA IQ is not required. |
| LT1613CS5#TRPBF | SOT-23-5 package; 1.4MHz frequency; fixed 5V output; no VC/COMP pins - simpler layout but no adjustable output or external compensation. | Ideal for fixed 5V point-of-load conversion where board space is extremely limited and output voltage is invariant. | Choose LT1613CS5#TRPBF for drop-in 5V generation in wearables; retain LT1610CS8#PBF for programmable outputs or multi-rail bias. |
Compared with LT1307CS8#PBF and LT1613CS5#TRPBF, the LT1610CS8#PBF offers superior light-load efficiency via Burst Mode™, wider output voltage range (up to 28V), and flexible compensation - making it optimal for battery-critical, multi-output, or space-constrained applications demanding design adaptability.
Availability
LT1610CS8#PBF is available at Aetrix Electronics and suitable for portable medical sensors, LCD bias supplies, battery backup systems, and single-cell IoT edge nodes requiring stable component supply with long-term lifecycle support.
Supply support for LT1610CS8#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 technical and manufacturing continuity for legacy Linear products including the LT1610 family.
The LT1610 belongs to Linear's micropower DC/DC converter product line, designed specifically for ultra-low-power, single-cell battery-powered equipment where extended runtime and minimal PCB area are critical.
FAQ
What is the minimum input voltage required for LT1610CS8#PBF to start switching?
The LT1610CS8#PBF begins switching at a minimum input voltage of 1.0V (typical), with guaranteed operation down to 0.9V over temperature. This allows reliable startup from nearly depleted alkaline, NiMH, or Li-ion single-cell sources - a key advantage over many competing boost converters that require ≥1.8V. The LT1610CS8#PBF sustains regulation even as the cell voltage decays further during discharge.
Can LT1610CS8#PBF be used in SEPIC topology, and what design considerations apply?
Yes, the LT1610CS8#PBF supports SEPIC configuration, as confirmed in Figure 4 and Figure 14 of its datasheet, enabling regulated output when input voltage may fall above or below the output (e.g., Li-ion 3V–4.2V to 3.3V). Critical considerations include using coupled or matched uncoupled inductors (e.g., Murata LQH3C220), selecting Schottky diodes rated for full input+output voltage (e.g., MBR0530), and verifying loop stability with the chosen output capacitor ESR.
Does LT1610CS8#PBF require external compensation components, or can it operate with internal compensation?
The LT1610CS8#PBF supports both configurations: tying the COMP pin (Pin 8) to VC (Pin 1) activates the internal 50kΩ/50pF compensation network - eliminating external RC parts and simplifying layout. For optimized transient response across varying loads/capacitors, an external RC (e.g., 220kΩ/220pF) can be connected from VC to ground, with COMP left floating. Internal compensation is sufficient for most standard boost designs.
What is the maximum continuous output current achievable with LT1610CS8#PBF in a 3.3V-to-5V boost application?
In a 3.3V-to-5V boost configuration, the LT1610CS8#PBF reliably delivers 200mA continuous output current, as specified in the "Features" section and validated in Typical Application TA06. This assumes proper thermal management (θJA = 160°C/W), low-ESR output capacitor (e.g., 22µF tantalum), and a 4.7µH inductor with ≥0.5A saturation rating. Peak switch current is limited to 600mA (typical), supporting brief load surges.
How does Burst Mode™ operation affect output voltage ripple in LT1610CS8#PBF?
Burst Mode™ in the LT1610CS8#PBF causes low-frequency (1–10kHz) output ripple under light loads (<5mA), as the IC cycles between active switching and sleep states to maintain regulation. Ripple amplitude depends on output capacitance and ESR - adding a 1µF X7R ceramic capacitor in parallel with the bulk output cap reduces peak-to-peak ripple by up to 8× (e.g., from 400mV to ~50mV), as shown in Figures TA08 and F08. This is essential for noise-sensitive analog circuits.
LT1610CS8#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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1610CS8#PBF FAQ
1.How can I place an order for LT1610CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1610CS8#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 LT1610CS8#PBF reliable?
The price and inventory of LT1610CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1610CS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1610CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1610CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1610CS8#PBF?
LT1610CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1610CS8#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 LT1610CS8#PBF?
For technical support, including LT1610CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1610CS8#PBF requirements.
6.How does Aetrix verify that LT1610CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1610CS8#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 LT1610CS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1610CS8#PBF?
All LT1610CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1610CS8#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 LT1610CS8#PBF part is unused and in its original packaging.
Return procedure for LT1610CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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