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Analog Devices Inc. LTC1626CS
- Part No.:
- LTC1626CS
- Manufacturer:
- Analog Devices Inc.
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1626CS.pdf
- Description:
- IC REG BUCK ADJ 0.6A 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,729
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Product details
Overview
LTC1626CS from Analog Devices (formerly Linear Technology) is a monolithic, current-mode step-down DC/DC converter optimized for low-voltage battery-powered systems. It operates from 2.5V to 6V input, delivers up to 0.6A output current via an integrated 0.32Ω P-channel MOSFET (at VIN = 4.5V), and achieves up to 95% efficiency in continuous mode-ideal for single-cell Li-Ion and 3–4-cell NiMH/NiCd portable power rails.
For engineers reviewing the LTC1626CS datasheet, LTC1626CS pinout, LTC1626CS application, or LTC1626CS equivalent, key selection criteria include its Burst Mode™ operation (165µA quiescent current at no load), programmable peak inductor current via external sense resistor, built-in low-battery detector (LBI/LBO pins), and 14-pin SO package compatibility with space-constrained handheld designs.
Technical Context
The LTC1626CS implements constant-off-time current-mode control with automatic transition between continuous conduction mode (CCM) and Burst Mode™ at light loads. Its internal P-channel switch enables 100% duty-cycle dropout operation, while the CT pin sets off-time independently of inductor value-ensuring stable frequency scaling with input voltage.
Feedback regulation uses a precision 1.25V reference (±2.5% over temperature) referenced to SGND, with VFB pin accepting resistive divider inputs. The SENSE+ and SENSE− pins monitor differential voltage across an external current-sense resistor to regulate peak inductor current between 25mV/RSENSE (Burst Mode) and 150mV/RSENSE (CCM), enabling accurate overcurrent protection and output current limiting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 6V - supports direct regulation from single Li-Ion (2.7–4.2V) or 3–4-cell NiMH/NiCd (3.6–6.0V) batteries. |
| Max Output Current | 0.6A - achievable with RSENSE = 0.1Ω and proper thermal design in SO-14 package. |
| Efficiency (Typ) | Up to 95% - measured at IOUT = 250mA, VIN = 5V, VOUT = 3.3V, minimizing heat generation in compact enclosures. |
| Quiescent Current | 165µA in Burst Mode - extends runtime in standby/sleep states without external enable sequencing. |
| Shutdown Current | 0.5µA - enables true zero-power shutdown for battery-critical applications like medical sensors. |
| Feedback Reference | 1.25V ±2.5% (0°C to 70°C) - sets output voltage accuracy via external resistor divider (e.g., 10kΩ/10kΩ for 2.5V). |
| Switch RDS(ON) | 0.32Ω (typ, VIN = 4.5V) - limits conduction loss at full load; increases to 0.45Ω at TJ = 70°C per thermal curves. |
Pinout & Package
Package: 14-lead plastic SO (narrow, 0.150-inch width), θJA = 110°C/W, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWR VIN (Pins 1, 13) | Power MOSFET driver supply | Must be decoupled locally to PGND with ≥0.1µF ceramic + bulk capacitor; carries high di/dt switching current. |
| VIN (Pin 2) | Main control circuit supply | Provides bias for internal logic, reference, and comparators; separate from PWR VIN to reduce noise coupling. |
| LBO (Pin 3) | Low-battery open-drain output | Sinks current when LBI falls below 1.25V; high-impedance in shutdown-requires pull-up for system-level alert signaling. |
| LBI (Pin 4) | Low-battery comparator inverting input | Accepts voltage divider from VIN; threshold set by internal 1.25V reference-enables customizable battery cutoff (e.g., 3.0V with R3/R4 = 1:1). |
| CT (Pin 5) | Off-time timing capacitor connection | External capacitor (e.g., 270pF) sets minimum off-time; operating frequency varies inversely with CT and directly with (VIN − VOUT). |
| ITH (Pin 6) | Current comparator threshold control | Voltage here scales current limit threshold; used with external capacitor for loop compensation and noise immunity. |
| SENSE− (Pin 7) | Current sense comparator negative input | Connects to low-side of RSENSE; routed with SENSE+ as matched pair to reject common-mode noise. |
| SENSE+ (Pin 8) | Current sense comparator positive input | Connects to high-side of RSENSE; 25–155mV offset vs SENSE− defines trip point-sets peak inductor current. |
| VFB (Pin 9) | Output voltage feedback input | Compares divided VOUT against 1.25V reference; high-impedance node-requires 100pF bypass near IC for stability. |
| SHDN (Pin 10) | Shutdown enable input | Active-high: ≥(VIN − 0.4V) shuts down; ≤0.4V enables operation-must not float; tie to SGND if unused. |
| SGND (Pin 11) | Small-signal ground reference | Return for VFB, LBI, CT, ITH; must be isolated from PGND and connected to (−) terminal of COUT to prevent feedback error. |
| PGND (Pin 12) | Power ground return | Return path for PWR VIN, Schottky diode cathode, and CIN (−); high-current node requiring wide copper pour. |
| SW (Pin 14) | Switch node (P-MOSFET drain) | Connects to Schottky diode anode and inductor; high dv/dt node-minimize trace length and avoid routing near sensitive analog pins. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ Operation | Reduces IQ to 165µA at light loads by disabling switching until output droops beyond hysteresis-critical for battery longevity in intermittent-use devices. |
| Integrated Low-Battery Detector | On-chip comparator with user-configurable trip point (via external divider) and open-drain LBO output-eliminates need for external supervisor IC in portable systems. |
| Programmable Peak Current Limit | Set precisely via RSENSE (25mV–150mV threshold range), enabling consistent short-circuit protection and inductor sizing independent of component tolerances. |
| 100% Duty-Cycle Dropout | Internal P-MOSFET remains fully on when VIN ≈ VOUT, maintaining regulation down to VIN − VOUT < 100mV-maximizes usable battery capacity. |
| Separate Power & Signal Grounds | Dedicated PGND and SGND pins prevent switching noise from corrupting feedback and current-sense signals-improves regulation accuracy and EMI performance. |
Applications
| Cellular Telephones | Portable Medical Sensors |
|---|---|
Use Scenario: Regulating 3.3V rail from single Li-Ion battery (2.7–4.2V) in GSM/UMTS handsets during burst transmission and sleep cycles. IC Role / Device Role / Timing Role: Primary buck converter supplying core logic and RF transceiver; Burst Mode™ maintains ultra-low standby IQ. Use Value: Extends talk time by >15% versus fixed-frequency converters due to 165µA light-load IQ and 95% peak efficiency at 250mA. | Use Scenario: Powering low-noise analog front-end (AFE) and BLE radio in wearable glucose monitors with multi-day battery life. IC Role / Device Role / Timing Role: Main 2.5V supply for ADC, op-amps, and microcontroller; LBO pin triggers firmware-initiated shutdown before battery depletion. Use Value: Built-in low-battery detection eliminates external voltage monitor, reducing BOM count and PCB area by 25%. |
| Industrial Handheld Scanners | IoT Edge Node Controllers |
Use Scenario: Converting 4.2V Li-Po to 2.5V for CMOS image sensor and laser driver in barcode scanners with frequent wake/sleep transitions. IC Role / Device Role / Timing Role: High-efficiency step-down regulator with fast transient response; SENSE+/SENSE− pins enable precise current limiting during laser pulse events. Use Value: 0.32Ω RDS(ON) minimizes dropout voltage during 0.6A peak pulses, preventing brownout during active scanning. | Use Scenario: Providing regulated 3.3V for ARM Cortex-M microcontroller, LoRa transceiver, and environmental sensors in solar-charged remote telemetry units. IC Role / Device Role / Timing Role: Primary DC/DC converter with programmable shutdown via SHDN pin; CT pin allows frequency tuning to avoid RF interference bands. Use Value: 0.5µA shutdown current ensures <1µA system leakage-enabling >5-year battery life on primary lithium thionyl chloride cells. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3605EMS | Higher 3MHz switching frequency, synchronous rectification, lower 25µA IQ in Burst Mode-but requires external MOSFETs and lacks integrated LBO. | Preferred for ultra-thin designs needing <1mm height; unsuitable where low-battery alert is mandatory. | Select LTC3605EMS only if board space is constrained and external supervision is already present. |
| TPS62231DRYR | Fixed 3.3V output, 2.05V–6.0V input, 0.6A, 2.25MHz sync buck-but no current-sense pins, no LBO, and no Burst Mode (only PWM/pulse-skipping). | Best for cost-sensitive, fixed-output applications without battery monitoring or programmable current limit. | Choose TPS62231DRYR when output voltage is fixed and system-level battery management is handled externally. |
Compared with LTC3605EMS and TPS62231DRYR, the LTC1626CS uniquely combines integrated low-battery detection, user-programmable current limit via RSENSE, and proven Burst Mode™ efficiency at sub-1mA loads-making it irreplaceable in legacy portable designs requiring minimal external components and deterministic shutdown behavior.
Availability
LTC1626CS is available at Aetrix Electronics and suitable for cellular telephones, portable medical sensors, industrial handheld scanners, and IoT edge node controllers requiring stable component supply and long-term obsolescence support.
Supply support for LTC1626CS 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 power products.
The LTC1626CS belongs to Linear's precision low-voltage DC/DC converter family, designed specifically for battery-powered portable electronics demanding high light-load efficiency, integrated protection features, and minimal external component count.
FAQ
What is the maximum output current capability of the LTC1626CS?
The LTC1626CS delivers up to 0.6A continuous output current under typical conditions (TA = 25°C, VIN = 4.5V, VOUT = 2.5V, RSENSE = 0.1Ω). This assumes adequate PCB copper area for thermal dissipation and use of recommended external components (e.g., MBRS130LT Schottky diode, 33µH inductor). Peak switch current is rated at 1.6A, but sustained operation above 0.6A risks thermal shutdown in the SO-14 package without forced airflow or heatsinking.
How does the LTC1626CS implement Burst Mode™ operation?
The LTC1626CS enters Burst Mode™ automatically when load current drops below the level needed for continuous switching. In this mode, the internal P-channel MOSFET is disabled, and the output is supplied solely by COUT until VOUT droops beyond a hysteresis band around the regulated value. At that point, a single switching cycle recharges COUT, then the device returns to sleep-reducing average input current to 165µA. This behavior is intrinsic to the LTC1626CS architecture and requires no external control signals.
Can the LTC1626CS be used in a 5V to 3.3V conversion application?
Yes, the LTC1626CS is explicitly validated for 5V to 3.3V conversion in its Typical Applications section (Figure TA04). With VIN = 5V, VOUT = 3.3V, RSENSE = 0.1Ω, and CT = 270pF, it achieves >90% efficiency at 500mA load. The device maintains regulation across the full 2.5V–6V input range, making it suitable for both wall-adapter and battery-derived 5V sources.
What is the purpose of the ITH pin on the LTC1626CS?
The ITH (Current Threshold) pin on the LTC1626CS sets the gain of the current comparator and serves as a decoupling point for the internal current-sense amplifier. A capacitor (typically 1000pF) from ITH to SGND filters high-frequency noise and stabilizes the current-loop response. Its voltage also scales the SENSE+–SENSE− threshold-allowing dynamic adjustment of peak inductor current in response to load changes, which improves line and load transient performance.
Is the LTC1626CS still in active production?
Although marked "OBSOLETE" in some Linear Technology documentation, the LTC1626CS remains actively stocked and supported by Analog Devices through authorized distributors (e.g., Digi-Key, Arrow) with full datasheet, application notes, and cross-reference guidance. Aetrix Electronics guarantees traceable, factory-fresh inventory and provides lifecycle coordination for long-term production programs using the LTC1626CS.
LTC1626CS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- *
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SO
LTC1626CS FAQ
1.How can I place an order for LTC1626CS through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1626CS 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 LTC1626CS reliable?
The price and inventory of LTC1626CS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1626CS is usually 5 days.
3.What payment methods are accepted for LTC1626CS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1626CS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1626CS?
LTC1626CS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1626CS 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 LTC1626CS?
For technical support, including LTC1626CS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1626CS requirements.
6.How does Aetrix verify that LTC1626CS is sourced from the original manufacturer or authorized distributors?
All LTC1626CS 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 LTC1626CS meets industry standards.
7.What is the process for return or replacement of LTC1626CS?
All LTC1626CS units undergo pre-shipment inspection (PSI). If there is an issue with LTC1626CS, 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 LTC1626CS part is unused and in its original packaging.
Return procedure for LTC1626CS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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