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Monolithic Power Systems Inc. MP111DS-LF
- Part No.:
- MP111DS-LF
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- Specialized ICs
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Description:
- IC STORAGE CAP CONTROL 8SOIC
- Quantity:
Unit Price:$0
Ext Price:$0
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Product Details
MP111DS-LF - Dying-Gasp Energy Storage and Release Controller
MP111DS-LF is the lead-free SOIC-8 version of Monolithic Power Systems' MP111. It charges an external storage capacitor during normal input operation and returns stored energy to the input rail when the supply falls below a programmed release threshold.
It is a storage-and-release controller, not a stand-alone energy source; hold-up time depends on the external capacitor, load and programmed voltages.
Overview
The MP111 maintains an external storage capacitor at a resistor-programmed voltage while input power is available. On a power failure it transfers charge back toward VIN, helping downstream circuitry retain power long enough to react. Separate feedback networks set storage and release voltages. Its open-drain GASP output signals the power-loss condition to a host.
Key Advantages
Built-in current limiting reduces inrush while charging the external storage capacitor.
Stored charge is released toward VIN when the input reaches the programmed release level.
External resistor dividers set the storage and release voltages for the application.
An open-drain indication can alert system logic that hold-up operation is active.
Feature Summary
The specified operating VIN range is 4.5 V to 18 V.
The data sheet lists a 250 mA typical precharge current limit for the storage capacitor.
A 2.5 A typical current limit is listed for transferring charge from storage to VIN.
DS denotes SOIC-8 and LF denotes the lead-free compliant package; optional P/Z suffixes indicate reel form.
Package & Footprint
The manufacturer specifies the MP111DS family in SOIC-8. LCDChip registers MP111DS-LF as 8-SOIC (0.154", 3.90 mm width). Check the controlled MPS package drawing, pin-one orientation and board land pattern before releasing a PCB.
- Keep the VIN decoupling and storage current path low impedance.
- Provide the BST network and VMAX decoupling specified by MPS.
- Connect GND with adequate copper and vias, and verify thermal rise.
The generic package image shows form factor only, not the device-specific pinout.
Pin Functions
The manufacturer's SOIC-8 top view assigns 1 BST (bootstrap connection to the converter switch-node network), 2 VIN (input supply), 3 FB2 (release-voltage feedback), 4 GND, 5 FB1 (storage-voltage feedback), 6 GASP (open-drain status output), 7 STRG (external storage capacitor), and 8 VMAX (internal-supply decoupling). Follow MPS component-value and layout guidance rather than treating this as a generic pin-compatible controller.
Key Specifications
| Function | Dying-gasp storage and release controller |
|---|---|
| Operating input VIN | 4.5 V to 18 V |
| Recommended storage voltage | VIN to 2 × VIN - 0.8 V, 32 V maximum |
| Storage precharge current limit | 250 mA typical |
| Storage-to-VIN release current limit | 2.5 A typical |
| Feedback reference | 1.0 V typical |
| GASP output | Open drain |
| Programmed thresholds | External resistor dividers at FB1 and FB2 |
| Operating junction temperature | -40 C to +125 C |
| Package | SOIC-8, lead-free LF variant |
| Thermal resistance | 90 C/W junction-to-ambient, stated 4-layer-board condition |
Current limits and thermal values depend on the manufacturer's specified measurement conditions; absolute maximum ratings are not operating setpoints.
Replacement Considerations
A similar SOIC-8 power-management IC is not a drop-in replacement. Compare charge and release topology, VIN and storage-voltage limits, current limits, FB thresholds, GASP behavior, bootstrap requirements, thermal performance and exact pin assignment. No internal substitute link is asserted without a confirmed matching database product and engineering equivalence review.
Manufacturer Information
Monolithic Power Systems' MP111 data sheet Rev. 1.0 (March 2020) documents the operating range, current limits, pin functions, application circuit and ordering suffixes. The MPS product page explicitly lists MP111DS-LF as an active part number. Use the current controlled document and lifecycle information for final qualification.
Applications
Provide a brief hold-up interval for orderly response to input loss.
Support power-fail signaling and controlled energy release in network terminals.
Preserve power long enough for system-defined shutdown or status handling.
Use storage-backed input support where the complete power tree has been validated.
Quality & Authenticity
Verify the full MP111DS-LF order code, SOIC-8 marking, lot traceability and lead-free documentation. Check behavior with the intended feedback resistors and storage capacitor; package appearance alone cannot confirm threshold accuracy or hold-up performance.
FAQ
Does the MP111 include the bulk energy-storage capacitor?
No. The capacitor is external and must be sized for the required load and hold-up time.
What does LF designate?
MPS uses LF for lead-free compliant packaging; DS identifies the SOIC-8 family.
What sets the release threshold?
An external resistor divider connected to FB2 sets the release voltage.
Is 2.5 A a continuous output guarantee?
No. It is the listed typical storage-to-VIN release current limit; system operation depends on thermal, voltage and stored-energy conditions.
Engineering Notice
Verify worst-case storage-capacitor capacitance, voltage rating, ESR and lifetime, including the intended hold-up interval and load. The BST pin requires the MPS-specified connection to the converter switch node for boost charging. Keep recommended operating conditions separate from absolute maximum ratings, and qualify GASP timing, feedback stability and thermal rise in the complete system.
MP111DS-LF Information
- Specifications
- Tags
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Storage Capacitor Control IC
- Applications:
- Cable/DSL/PON Modems
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
- Grade:
- -
- Qualification:
- -
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