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Diodes Incorporated LSP5527-S8A
- Part No.:
- LSP5527-S8A
- Manufacturer:
- Diodes Incorporated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LSP5527-S8A.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,280
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Product details
Overview
LSP5527-S8A from Diodes Incorporated is a monolithic synchronous buck DC-DC converter delivering 2A continuous output current with integrated 95 mΩ high- and low-side MOSFETs, operating across 4.5V–27V input range and regulating output from 0.925V to 0.8×VIN. It employs current-mode control for fast transient response, features fixed 340 kHz switching frequency, and is used in FPGA/DSP power supplies and notebook computer core voltage regulation.
For engineers reviewing the LSP5527-S8A datasheet, LSP5527-S8A pinout, LSP5527-S8A application, or LSP5527-S8A equivalent, key selection criteria include input voltage range compatibility, soft-start programmability, cycle-by-cycle overcurrent protection, thermal shutdown at 160°C, and stability with low-ESR ceramic output capacitors.
Technical Context
This device implements peak current-mode control with an internal error amplifier (transconductance 920 µA/V, DC gain 480 V/V) and a 340 kHz oscillator. The feedback reference is precisely trimmed to 0.925 V (±2.7%), enabling accurate output regulation across line and load variations.
Protection architecture includes input UVLO (4.0 V rising threshold, 100 mV hysteresis), EN pin lockout (2.5 V enable threshold), short-circuit detection (reducing switching frequency to 120 kHz), and thermal shutdown with 25°C hysteresis. The bootstrap circuit supports high-side gate drive via a 0.01 µF capacitor between BS and SW pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2 A continuous - supports mid-power digital loads like FPGAs without external MOSFETs. |
| Input Voltage Range | 4.5 V to 27 V - enables direct operation from 5 V, 12 V, or 24 V industrial rails. |
| Feedback Reference | 0.925 V ±2.7% - sets output accuracy; used with resistor divider to configure 1.0 V–12 V outputs. |
| Switching Frequency | 340 kHz fixed - balances EMI, inductor size, and efficiency; drops to 120 kHz during short circuit. |
| Efficiency | Up to 96% - achieved using integrated 95 mΩ dual MOSFETs and low-quiescent-current operation (1.5 mA typical). |
| Soft-Start | Programmable via SS pin capacitor - 0.1 µF yields 15 ms ramp; prevents inrush into downstream capacitance. |
| Thermal Shutdown | 160°C junction temperature - protects against sustained overload; recovers after cooling below 135°C. |
Pinout & Package
Package: SOP-8L (Surface-Mount Small Outline Package, 8-pin, lead-free, RoHS-compliant, MSL Level 3).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 BS | Bootstrap supply | Provides gate drive voltage for high-side MOSFET; requires 0.01 µF capacitor to SW. |
| 2 VIN | Main input supply | Accepts 4.5–27 V; must be bypassed to GND with low-ESR capacitor near pin. |
| 3 SW | Switch node | Connects to inductor; carries high di/dt switching current; critical for layout and EMI control. |
| 4 GND | Power ground | Primary return path for high-side/low-side currents; must be low-inductance connection. |
| 5 FB | Feedback input | Senses output voltage via resistor divider; regulated to 0.925 V reference. |
| 6 COMP | Compensation node | Connects RC network to stabilize control loop; determines phase margin and transient response. |
| 7 EN | Enable control | Active-high logic input (2.5 V threshold); 200 kΩ pull-up to VIN recommended for reliable startup. |
| 8 SS | Soft-start timing | Capacitor-to-GND sets ramp time; open = disable soft-start; 0.1 µF = 15 ms. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Stage | Dual 95 mΩ MOSFETs eliminate external switches and reduce BOM count and PCB area. |
| Current-Mode Control | Enables inherent cycle-by-cycle current limiting and stable operation across wide duty cycles (up to 92%). |
| Ceramic-Capacitor Compatible | Stable with low-ESR ceramic output caps (e.g., 22 µF); eliminates need for bulk electrolytic capacitors. |
| Comprehensive Protection | Includes UVLO, overcurrent, short-circuit, and thermal shutdown - reduces need for external supervision circuits. |
| Adjustable Output | 0.925 V to 0.8×VIN range supports common core voltages (1.0 V, 1.2 V, 1.8 V, 3.3 V, 5 V) via simple resistor divider. |
Applications
| FPGA Core Power Supply | Notebook CPU Core Regulator |
|---|---|
|
Use Scenario: Powers Xilinx Artix-7 or Intel Cyclone V FPGA core rails requiring tight voltage tolerance and fast load transient response. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering 1.0 V/1.2 V at up to 2 A with <1% output deviation under 1 A step load. Use Value: Integrated MOSFETs and 340 kHz switching enable compact, low-noise design meeting FPGA VCCINT ripple spec (<20 mVpp). |
Use Scenario: Supplies CPU core voltage in ultra-thin notebooks where board space and thermal headroom are constrained. IC Role / Device Role / Timing Role: Main DC-DC converter generating 1.05 V/1.1 V from 12 V battery or adapter rail, supporting dynamic voltage scaling. Use Value: 96% peak efficiency and thermal shutdown at 160°C allow reliable operation in sealed chassis with limited airflow. |
| Networking ASIC Bias Rail | Distributed Telecom Power |
|
Use Scenario: Generates 1.8 V bias for Marvell Prestera or Broadcom StrataXGS switch ASICs in 1U rack-mounted switches. IC Role / Device Role / Timing Role: Secondary point-of-load regulator fed from 3.3 V or 5 V intermediate bus, handling 1.5 A steady-state load. Use Value: Input UVLO (4.0 V) and EN pin sequencing ensure clean power-up of ASICs synchronized with system management controller. |
Use Scenario: Provides isolated 5 V/2 A auxiliary power in telecom line cards where 24 V or 48 V backplane is available. IC Role / Device Role / Timing Role: Non-isolated buck stage converting 27 V max input to stable 5 V output for microcontroller, PHY, and interface ICs. Use Value: 27 V absolute max input rating and robust short-circuit protection support unregulated industrial 24 V systems with voltage spikes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2315DJ-LF-Z (Monolithic Power) | 3A rated, 4.5–28V input, 500 kHz switching, no integrated bootstrap capacitor requirement. | Higher current capability but less optimal for 2A designs due to larger inductor requirements and higher light-load quiescent current (250 µA vs. 0.3 µA shutdown). | Select when >2A output or faster transient response is required; verify layout for higher-frequency EMI mitigation. |
| TPS54202HDDCR (Texas Instruments) | 2A, 4.5–28V, 500 kHz, integrated soft-start and power-good, but requires external bootstrap diode. | Better light-load efficiency (PFM mode) and built-in PG signal, yet lacks cycle-by-cycle OCP and has higher minimum on-time (130 ns vs. 220 ns). | Prefer for battery-powered systems needing PFM; avoid in high-noise environments where cycle-by-cycle OCP is critical. |
Compared with MP2315DJ-LF-Z and TPS54202HDDCR, the LSP5527-S8A offers superior thermal protection (160°C shutdown), tighter feedback reference (±2.7%), and simpler bootstrap implementation - making it optimal for cost-sensitive, thermally constrained 2A applications without PFM needs.
Availability
LSP5527-S8A is available at Aetrix Electronics and suitable for FPGA power supplies, notebook computing subsystems, and networking ASIC bias rails requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for LSP5527-S8A 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions.
The LSP5527 belongs to Diodes' high-efficiency synchronous buck regulator product line, designed specifically for space-constrained, mid-power digital load applications in computing, networking, and consumer electronics.
FAQ
What is the minimum output voltage achievable with the LSP5527-S8A?
The LSP5527-S8A regulates its feedback node to 0.925 V, and the datasheet specifies an output range from 0.925 V to 0.8×VIN. Therefore, the absolute minimum output voltage is 0.925 V - confirmed by electrical characteristics table (VFB min = 0.900 V, typ = 0.925 V). This allows stable generation of 1.0 V, 1.2 V, and other standard core voltages using external resistive dividers.
Can the LSP5527-S8A operate with only ceramic capacitors on input and output?
Yes - the LSP5527-S8A is explicitly characterized for stability with low-ESR ceramic output capacitors (e.g., 22 µF X5R/X7R), and the datasheet recommends pairing a bulk electrolytic input cap (≥68 µF) with a local 0.1 µF ceramic. For VIN ≤15 V, pure ceramic input is acceptable; above 15 V, a hybrid approach is advised to avoid resonant voltage spikes caused by trace inductance.
How does the soft-start function behave when the SS pin is left unconnected?
Per the Pin Descriptions section, leaving the SS pin unconnected disables the soft-start feature entirely. The device powers up with full duty cycle immediately upon EN assertion, which may cause inrush current into large output capacitance. To ensure controlled startup, a capacitor (e.g., 0.1 µF) must be connected from SS to GND - yielding a 15 ms soft-start period - or a pull-down resistor can be used for deterministic behavior.
What is the maximum allowable input voltage for continuous operation?
The Recommended Operating Conditions table specifies a maximum input voltage of 27 V for continuous operation. While the Absolute Maximum Rating permits 30 V transiently, sustained operation above 27 V risks exceeding internal voltage limits on the BS, SW, and EN pins - especially under high ambient temperature - and may trigger UVLO or thermal shutdown. Designers must maintain VIN ≤27 V under all steady-state conditions.
LSP5527-S8A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 27V
- Voltage - Output (Min/Fixed):
- 0.925V
- Voltage - Output (Max):
- 21.6V
- Current - Output:
- 2A
- Frequency - Switching:
- 340kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -20°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOP
LSP5527-S8A FAQ
1.How can I place an order for LSP5527-S8A through Aetrix?
Please submit a Request for Quotation (RFQ) for LSP5527-S8A 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 LSP5527-S8A reliable?
The price and inventory of LSP5527-S8A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LSP5527-S8A is usually 5 days.
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4.How is shipping managed for LSP5527-S8A?
LSP5527-S8A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LSP5527-S8A 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 LSP5527-S8A?
For technical support, including LSP5527-S8A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LSP5527-S8A requirements.
6.How does Aetrix verify that LSP5527-S8A is sourced from the original manufacturer or authorized distributors?
All LSP5527-S8A 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 LSP5527-S8A meets industry standards.
7.What is the process for return or replacement of LSP5527-S8A?
All LSP5527-S8A units undergo pre-shipment inspection (PSI). If there is an issue with LSP5527-S8A, 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 LSP5527-S8A part is unused and in its original packaging.
Return procedure for LSP5527-S8A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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