LT1777CS#PBF Analog Devices Integrated Circuit (Small Outline Packages) In Stock
The Analog Devices LT1777CS#PBF is a low-noise, current-mode PWM step-down switching regulator in a 16-pin SOIC package. It accepts a 7.4 V to 48 V input range and delivers regulated output voltages with minimal EMI, making it ideal for noise-sensitive industrial and telecom power supplies. Available from stock worldwide with lead-free RoHS-compliant construction.
- Manufacturer
- Analog Devices
- Package
- Small Outline Packages
- Pin Count
- 16
- Lifecycle
- ACTIVE
- Datasheet
- LT1777CS#PBF Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $3.6400(MOQ 19)
- Temp Range
- ?°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Wide 7.4 V to 48 V input range covers industrial 24 V and telecom 48 V bus voltages in a single device
- Current-mode PWM control with low output noise for analog and RF power supply designs where EMI must be minimized
- 16-pin SOIC (S16) package with standard 1.27 mm pitch footprint enables compact layout and easy hand-soldering during prototyping
- Internal slope compensation and cycle-by-cycle current limiting provide inherent short-circuit protection
Applications
The LT1777CS#PBF is designed for step-down power conversion in industrial control, test instrumentation, and telecom line-card applications where a wide input range of 7.4 V to 48 V and low output noise are simultaneously required. Its current-mode control architecture supports fast transient response for loads that switch abruptly, such as DSP or FPGA cores powered from a 24 V distribution bus. The 16-pin SOIC footprint integrates into dense power supply modules alongside filtering components.
Specifications
| Pbfree Code | No |
| Manufacturer Package Code | 05-08-1610 (S16) |
| YTEOL | 9 |
| Analog IC - Other Type | SWITCHING REGULATOR |
| Control Mode | CURRENT-MODE |
| Control Technique | PULSE WIDTH MODULATION |
| Input Voltage-Max | 48V |
| Input Voltage-Min | 7.4V |
| Input Voltage-Nom | 24V |
| JESD-30 Code | R-PDSO-G16 |
| JESD-609 Code | e3 |
| Number of Functions | 1 |
| Output Current-Max | 1A |
| Package Body Material | PLASTIC/EPOXY |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Supply Current-Max (Isup) | 4.5mA |
| Surface Mount | YES |
| Switcher Configuration | BUCK |
| Switching Frequency-Max | 115kHz |
| Technology | BIPOLAR |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.01 |
| Country of Origin | Malaysia |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What input voltage range does LT1777CS#PBF support and which power bus standards does that cover?
The LT1777CS#PBF accepts input voltages from 7.4 V to 48 V, spanning standard 12 V, 24 V, and 48 V industrial and telecom distribution bus voltages. A single design using this regulator can be deployed across multiple product variants without changing the power conversion stage, reducing BOM complexity. The 48 V upper limit also suits PoE-powered equipment and railway auxiliary supplies.
How does the current-mode PWM control of LT1777CS#PBF benefit noise-sensitive applications?
Current-mode PWM control in the LT1777CS#PBF senses the inductor current on a cycle-by-cycle basis, allowing the regulator to respond within one switching cycle to load transients. This results in lower output voltage deviation during sudden load steps compared to voltage-mode controllers. Combined with the device's inherent low-noise switching topology, it is suitable for powering analog signal chains, ADCs, and RF modules where supply ripple below a few millivolts is required.
In which package does the LT1777CS#PBF come and what does that mean for PCB layout?
The LT1777CS#PBF is housed in a 16-pin SOIC (1.27 mm pitch, 10.3 mm body length) package. This wide-body SOIC provides adequate pin spacing to route the high-side switch, bootstrap, and feedback pins away from each other, reducing parasitic coupling. The exposed thermal pad is not present on this package, so a heat-slug PCB area is not required, but adequate copper pour around VIN and PGND pins is still recommended for thermal management at the maximum 48 V input.
Can LT1777CS#PBF be used in a 48 V telecom rack application, and what output voltages can it produce?
Yes. With a 48 V nominal input comfortably within the 7.4 V to 48 V rated range, the LT1777CS#PBF is directly applicable to telecom 48 V rack power conversion. Output voltage is set by an external resistor divider referenced to the internal 1.25 V reference, allowing output voltages from approximately 1.25 V up to several tens of volts. Common targets for 48 V step-down include 5 V, 3.3 V, and 12 V rails for mixed-logic and analog loads.
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About Analog Devices
Analog Devices (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing integrated circuits used in virtually all types of electronic equipment.
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| 50+ | $3.6400 | $182.00 |
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