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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Monolithic Power Systems Inc. MP1522ET-LF-P

Name: MP1522ET-LF-P
Brand: Monolithic Power Systems Inc.
SKU: MP1522ET-LF-P
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MP1522ET-LF-P

Manufacturer:: Monolithic Power Systems Inc.

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: SC-74A, SOT-753

Datasheet:: MP1522ET-LF-P.pdf

Description:: IC REG BOOST ADJ 300MA SOT23-5

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Product details

Overview

MP1522ET-LF-P from Monolithic Power Systems is a 25V step-up DC-DC converter with internal 0.5Ω N-channel MOSFET, operating from 2.7V to 25V input and delivering up to 25V output. It uses variable-frequency constant-peak-current control, features 1.23V feedback threshold, 550ns minimum off-time, and integrated thermal shutdown and input UVLO. Used in compact portable power rails for LCD bias and camera flash drivers.

For engineers reviewing the MP1522ET-LF-P datasheet, MP1522ET-LF-P pinout, MP1522ET-LF-P application, or MP1522ET-LF-P equivalent, key selection criteria include output voltage programmability via FB divider, BIAS pin bootstrapping capability for low-VIN efficiency, EN logic-level on/off control, and SOT23-5 thermal performance under 450mA peak switch current.

Technical Context

The MP1522ET-LF-P implements a variable-frequency, constant-peak-current boost architecture with 450mA internal current limit and 550ns minimum off-time (extended to 1.6µs at startup). Its feedback comparator regulates output using a precise 1.23V reference with 10mV hysteresis.

BIAS pin enables internal circuitry bootstrapping from VOUT for improved gate drive at low VIN, or direct connection to VIN for reduced quiescent current. EN pin accepts 0.8–2.0V logic thresholds with 60mV hysteresis and <1µA bias current.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	2.7V to 25V - supports single-cell Li-ion, multi-cell alkaline, and intermediate bus rails
Output Voltage Range	VIN to 25V - programmable via external resistor divider on FB pin
Feedback Threshold	1.23V ±40mV - sets output accuracy and stability margin for divider design
Internal Switch R_DS(on)	0.5Ω typ - enables high-efficiency operation up to 25V output with minimal conduction loss
Peak Switch Current Limit	450mA - defines maximum inductor energy transfer per cycle and limits fault current
Shutdown Current	1µA max - preserves battery life in standby mode of handheld devices
Thermal Shutdown	160°C - protects device during overload or poor PCB thermal management

Pinout & Package

SOT23-5 package: 2.9mm × 1.6mm × 1.1mm body, 0.95mm pitch, JEDEC MO-178 AA compliant, rated for –20°C to +85°C ambient operation.

Pin/Terminal	Circuit Role	Design Meaning
1 - SW	Switch Node	Drain of internal N-MOSFET; connects to inductor and rectifier anode; swings from GND to VOUT
2 - GND	Power Ground	Reference for all internal circuits and return path for inductor current and IC bias
3 - FB	Feedback Input	High-impedance input sensing divided output voltage; regulates at 1.23V threshold
4 - EN	Enable Control	Logic-level input (0.8–2.0V threshold); pulls internal regulator on/off; <1µA leakage
5 - BIAS	Internal Bias Supply	Provides gate drive and core bias; connect to VOUT for low-VIN efficiency or VIN for lower I_Q

Key Features

Feature	Design Value
Variable-Frequency Constant-Peak-Current Control	Adapts switching frequency to load and input conditions, minimizing output capacitor size while maintaining regulation
BIAS Pin Flexibility	Enables dual supply configuration: bootstrapped from VOUT for >90% efficiency at 3.3V input, or tied to VIN for <650µA quiescent current
Integrated Protection Functions	Includes undervoltage lockout (2.3V typ), thermal shutdown (160°C), and internal current limiting (450mA)
Low-Noise Layout Support	Requires feed-forward capacitor across FB divider (1nF–10nF) and tight placement of 0.1µF BIAS bypass to suppress switching noise coupling

Applications

Handheld Computer LCD Bias

Digital Camera Flash Driver

Use Scenario: Generating 18–25V bias rail for small monochrome or color STN/TFT LCD panels in PDAs and early smartphones.

IC Role / Device Role / Timing Role: Primary boost converter supplying regulated high-voltage analog rail; operates in discontinuous conduction mode at light loads.

Use Value: Delivers stable 20V @ 15mA from 3.3V input with <1% output ripple, enabled by 1.23V precision FB reference and 550ns off-time control.

Use Scenario: Charging high-voltage capacitor (100–330µF) for xenon flash in digital still cameras.

IC Role / Device Role / Timing Role: High-efficiency charge pump alternative; provides fast transient response to enable rapid flash recycling.

Use Value: Achieves 90% efficiency at 25V/10mA output from 3.3V input, leveraging 0.5Ω R_DS(on) and variable-frequency operation to minimize EMI during burst charging.

Cell Phone Backlight Supply

Portable Medical Sensor Bias

Use Scenario: Driving white LED strings requiring 15–20V forward voltage in legacy GSM handsets.

IC Role / Device Role / Timing Role: Constant-current source interface via external current-sense resistor; regulated by FB voltage scaling.

Use Value: Maintains ±2% LED current accuracy over temperature using 10mV FB hysteresis and low-drift internal reference.

Use Scenario: Providing isolated 12V analog bias for photodiode transimpedance amplifiers or MEMS sensor excitation in portable diagnostics.

IC Role / Device Role / Timing Role: Low-noise, low-quiescent-power auxiliary supply; operated in shutdown between measurement cycles.

Use Value: Draws only 1µA in shutdown and resumes regulation within 1.6µs start-up delay, enabling microamp-level system sleep current.

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-up converter applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS61040DRVR	Fixed 600kHz frequency, 28V max output, 0.45Ω switch, no BIAS pin	Lacks bootstrapped gate drive; less efficient below 4V input; requires external soft-start	Prefer when fixed-frequency EMI control is required and input stays ≥4V
MAX17062ETA+	20V max output, 0.35Ω switch, integrated soft-start, 2.5µA shutdown current	Lower max output limits use in 25V LCD bias; higher shutdown current reduces battery life in ultra-low-power modes	Prefer for space-constrained designs needing integrated soft-start and tighter output tolerance (±0.8%)

Compared with TPS61040DRVR and MAX17062ETA+, the MP1522ET-LF-P uniquely supports 25V output with BIAS pin flexibility-enabling >90% efficiency down to 2.7V input-making it optimal for legacy portable displays where both high voltage and battery longevity are critical.

Availability

MP1522ET-LF-P is available at Aetrix Electronics and suitable for handheld computers, digital cameras, and small LCD displays requiring stable component supply and long-term industrial availability.

Supply support for MP1522ET-LF-P 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

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance analog and power ICs, headquartered in Kirkland, WA, with global design and support operations.

The MP1522 belongs to MPS's low-pin-count, high-efficiency DC-DC converter product line, designed specifically for space- and battery-constrained portable electronics requiring wide-input, high-output boost capability in SOT23 packages.

FAQ

What is the recommended inductor value for MP1522ET-LF-P at 3.3V input?

For 3.3V input, use ≥4.7µH inductors rated for >450mA peak current. Lower values increase switching frequency and reduce output ripple but risk exceeding the current-limit comparator delay; 6.8µH is preferred for 5V input to ensure reliable 550ns+ off-time compliance.

Can BIAS be left unconnected?

No. BIAS must be connected either to VOUT (for enhanced low-VIN efficiency) or to VIN (to minimize quiescent current). Leaving it floating causes undefined operation and potential failure due to insufficient internal bias voltage.

What diode type is required for MP1522ET-LF-P?

A Schottky barrier diode with ≥1.5×VOUT reverse breakdown rating is mandatory. For 20V output, use RB751 (30V) or similar fast-recovery Schottky; silicon PN diodes cause excessive losses and thermal stress due to slow recovery.

How is output voltage set on MP1522ET-LF-P?

VOUT is set by a resistive divider from output to FB pin, solving R2 = R1 × (VOUT/1.23 − 1). With R1 = 130kΩ and VOUT = 20V, R2 = 2MΩ (standard 1% value); a 1nF capacitor must be placed in parallel with R2 for loop stability.

Does MP1522ET-LF-P support automatic restart after thermal shutdown?

Yes. After junction temperature drops below ~145°C (15°C hysteresis), the device automatically resumes normal operation without requiring EN toggling or power cycle, ensuring robust fault recovery in thermally constrained layouts.

Is there a recommended PCB layout for minimizing EMI?

Yes: place 0.1µF ceramic BIAS bypass ≤2mm from pins 5–2; route SW (pin 1) with short, wide traces; locate FB divider resistors and 1nF feed-forward cap adjacent to pin 3; use separate power and quiet ground planes joined at single point near GND (pin 2).

What is the minimum off-time during normal operation versus startup?

Normal operation minimum off-time is 300–700ns (typ 550ns); during startup (first 64 pulses after EN high), it extends to 1.6µs to prevent output overshoot and ensure glitch-free turn-on under varying load and input conditions.

MP1522ET-LF-P Specifications

Product attributes: Attribute value

Manufacturer:: Monolithic Power Systems Inc.

Series:: -

Package/Case:: SC-74A, SOT-753

Packaging:: Tape & Reel (TR)

Product Status:: Active

Function:: Step-Up

Output Configuration:: Positive

Topology:: Boost

Output Type:: Adjustable

Number of Outputs:: 1

Voltage - Input (Min):: 2.7V

Voltage - Input (Max):: 25V

Voltage - Output (Min/Fixed):: 2.7V

Voltage - Output (Max):: 25V

Current - Output:: 300mA (Switch)

Frequency - Switching:: -

Synchronous Rectifier:: No

Operating Temperature:: -20°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-5

MP1522ET-LF-P FAQ

1.How can I place an order for MP1522ET-LF-P through Aetrix?

Please submit a Request for Quotation (RFQ) for MP1522ET-LF-P 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 MP1522ET-LF-P reliable?

The price and inventory of MP1522ET-LF-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP1522ET-LF-P is usually 5 days.

3.What payment methods are accepted for MP1522ET-LF-P?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP1522ET-LF-P transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MP1522ET-LF-P?

MP1522ET-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MP1522ET-LF-P 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 MP1522ET-LF-P?

For technical support, including MP1522ET-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP1522ET-LF-P requirements.

6.How does Aetrix verify that MP1522ET-LF-P is sourced from the original manufacturer or authorized distributors?

All MP1522ET-LF-P 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 MP1522ET-LF-P meets industry standards.

7.What is the process for return or replacement of MP1522ET-LF-P?

All MP1522ET-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP1522ET-LF-P, 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 MP1522ET-LF-P part is unused and in its original packaging.

Return procedure for MP1522ET-LF-P:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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