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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Battery Chargers

Monolithic Power Systems Inc. MP2603EJ-LF-Z

Name: MP2603EJ-LF-Z
Brand: Monolithic Power Systems Inc.
SKU: MP2603EJ-LF-Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MP2603EJ-LF-Z

Manufacturer:: Monolithic Power Systems Inc.

Category:: Battery Chargers

Package:: SOT-23-5 Thin, TSOT-23-5

Datasheet:: MP2603EJ-LF-Z.pdf

Description:: IC BATT CHG LI-ION TSOT23-5

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MP2603EJ-LF-Z from Monolithic Power Systems is a single-cell linear Li-ion battery charger IC with programmable 50–150mA constant-current/constant-voltage charging, 4.20V ±0.75% battery regulation accuracy, and integrated thermal protection at 130°C. It operates from 4.75–5.25V input, requires no external sense resistor or reverse-blocking diode, and targets compact portable devices such as Bluetooth headsets and digital cameras.

For engineers reviewing the MP2603EJ-LF-Z datasheet, MP2603EJ-LF-Z pinout, MP2603EJ-LF-Z application, or MP2603EJ-LF-Z equivalent, key selection criteria include its TSOT23-5 package footprint, 1µA max battery reverse leakage, 640mV dropout at 150mA, CHGZ open-drain status output, and absence of required output capacitor for stability.

Technical Context

The MP2603EJ-LF-Z implements a fully integrated linear charging architecture with internal current-setting reference and voltage regulation loop. It autonomously transitions between trickle charge (at <2.6V), constant-current (CC) mode (programmed via IPGM resistor), and constant-voltage (CV) mode (4.20V ±0.04V) without external control logic.

Thermal regulation activates at 130°C junction temperature by reducing the internal current reference, maintaining continuous but scaled-down charging. The CHGZ pin provides end-of-charge detection when charge current falls to ≤10% of programmed I_CHG, signaled by high-impedance release to VBATT.

Key Specifications

Parameter	Value and Actual Design Meaning
Charge Current Range	50–150mA, set externally via IPGM-to-GND resistor (e.g., 2.5kΩ → 151mA)
Battery Regulation Voltage	4.20V ±0.04V (0°C to +50°C), enabling accurate full-charge termination for Li-ion cells
Input Surge Rating	25V absolute max on IN pin, allowing robust operation with unregulated or transient-prone 5V supplies
Battery Reverse Leakage	<1µA at VBATT = 4V, minimizing self-discharge when input is disconnected
Dropout Voltage	640mV at 150mA, defining minimum VIN–VBATT margin needed for full-current CC operation
Thermal Shutdown Threshold	130°C (guaranteed by design), providing automatic current derating without shutdown interruption
Trickle Threshold	2.60V ±0.15V, initiating safe low-current pre-charge for deeply discharged batteries

Pinout & Package

MP2603EJ-LF-Z is housed in a 5-pin TSOT23 package (2.9mm × 1.6mm × 0.9mm), optimized for space-constrained portable PCB layouts. Pin 1 (IPGM) sets charge current; Pin 3 (CHGZ) is open-drain status output; Pin 4 (IN) accepts 4.75–5.25V supply; Pin 5 (BATT) connects directly to cell anode.

Pin/Terminal	Circuit Role	Design Meaning
1 - IPGM	Charge current programming input	Connects to GND via resistor (1.5kΩ–12.4kΩ) to set I_CHG; no capacitor allowed
2 - GND	Chip ground reference	System ground return path for all internal circuits and current sensing
3 - CHGZ	Open-drain charge status output	Sinks current during charging; floats HIGH at end-of-charge (≤10% I_CHG)
4 - IN	Input power supply	Accepts 4.75–5.25V; includes internal 500kΩ pull-down and 25V surge tolerance
5 - BATT	Battery output terminal	Direct connection to single-cell Li-ion anode; supports optional output capacitor

Key Features

Feature	Design Value
No external current-sense resistor	Reduces BOM count and layout area; eliminates resistor tolerance impact on I_CHG accuracy
No external reverse-blocking diode	Enables direct IN-to-BATT path while blocking reverse current <1µA, simplifying power path
Integrated thermal regulation	Maintains continuous charging below 130°C junction temp without hard shutdown or restart delay
Trickle charge enable below 2.6V	Protects over-discharged cells by limiting initial current to ≤15% of programmed I_CHG
CHGZ status pin with LED/microcontroller interface	Supports visual (LED+430Ω) or digital (1kΩ pull-up) end-of-charge indication without extra logic

Applications

Bluetooth Headset Charging

MP3 Player Power Management

Use Scenario: Compact wireless audio device with 3.7V Li-ion cell requiring safe, space-efficient charging from USB 5V.

IC Role / Device Role / Timing Role: Linear charger IC managing CC/CV profile, thermal foldback, and end-of-charge signaling.

Use Value: Eliminates need for external sense resistor and blocking diode, reducing solution size by >30% vs discrete alternatives.

Use Scenario: Portable media player with intermittent USB charging and battery-backed operation.

IC Role / Device Role / Timing Role: Single-cell Li-ion charger with trickle mode, precise 4.20V regulation, and CHGZ status reporting.

Use Value: Ensures full capacity utilization and cycle life via ±0.75% VBATT accuracy and low 1µA reverse leakage.

Digital Camera Battery Pack

Mini PDA System Power

Use Scenario: Small-format digital camera using 3.7V Li-ion with fast-turnaround recharge capability.

IC Role / Device Role / Timing Role: Linear charger delivering up to 150mA CC current and transitioning to CV at 4.20V.

Use Value: 640mV dropout enables full 150mA charge even with VIN as low as 4.4V, improving USB port compatibility.

Use Scenario: Handheld PDA with limited PCB real estate and requirement for reliable battery management.

IC Role / Device Role / Timing Role: Integrated charger with thermal protection, UVLO, and open-drain status output.

Use Value: 130°C thermal limit prevents overheating during extended charging in sealed enclosures.

Equivalent & Alternatives

The following parts are listed as comparable options for similar single-cell linear Li-ion charger applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TP4056	Fixed 1A charge current; no programmable I_CHG; requires external sense resistor; no thermal regulation	Higher current, less precision, no thermal foldback-suited for cost-sensitive, non-thermal-critical designs	Select TP4056 only if 1A fixed current suffices and thermal derating is not required.
BQ24075	1A max charge current; integrated LDO for system power; I_CHG set by resistor; includes input OVP and battery NTC monitoring	More complex feature set (system power path, safety monitoring); larger QFN package	Choose BQ24075 when simultaneous system power delivery and battery charging are needed.

Compared with TP4056 and BQ24075, MP2603EJ-LF-Z offers optimal balance of ultra-low component count, precise 4.20V regulation, and autonomous thermal foldback in a 5-pin TSOT23-ideal for sub-150mA, space-constrained, thermally sensitive applications.

Availability

MP2603EJ-LF-Z is available at Aetrix Electronics and suitable for Bluetooth headsets, MP3 players, and digital cameras requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.

Supply support for MP2603EJ-LF-Z 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, with a focus on efficiency, integration, and thermal robustness.

The MP2603 product line delivers cost-optimized, highly integrated linear Li-ion chargers for portable consumer electronics where minimal external components and predictable thermal behavior are critical.

FAQ

What is the minimum input voltage required to enable MP2603EJ-LF-Z?

The MP2603EJ-LF-Z enables when input voltage exceeds 3.5V. Its input under-voltage lockout (UVLO) threshold has a falling-edge hysteresis of 190mV, with typical turn-on at 2.3V and turn-off at 2.11V. Operation is guaranteed only within the recommended range of 4.75–5.25V.

Can MP2603EJ-LF-Z charge a battery without an output capacitor?

Yes. The MP2603EJ-LF-Z is internally compensated and does not require an output capacitor for stability. A capacitor on the BATT pin is optional and used only to reduce ripple or improve transient response-not for loop compensation.

How is charge current programmed on MP2603EJ-LF-Z?

Charge current is set by connecting a resistor (R_PGM) between IPGM (Pin 1) and GND. The relationship is I_CHG ≈ 2.53 mA × (1000 kΩ / R_PGM). For example, a 2.5kΩ resistor yields ~151mA. Values from 1.5kΩ to 12.4kΩ support 50–150mA range.

What happens when the die temperature reaches 130°C?

At 130°C, the internal thermal regulation circuit reduces the current-setting reference voltage, causing charge current to decrease gradually while remaining continuous. This avoids abrupt shutdown and restart cycles, preserving battery health and user experience during sustained high-power charging.

Is MP2603EJ-LF-Z compatible with lithium-polymer batteries?

Yes. The MP2603EJ-LF-Z is designed for single-cell Li-ion and Li-polymer batteries with nominal 3.7V and 4.2V termination voltage. Its 4.20V ±0.75% regulation accuracy matches standard LiPo chemistry requirements without modification.

Does CHGZ indicate charging status during trickle mode?

No. CHGZ remains LOW throughout trickle charge, constant-current, and constant-voltage phases. It transitions to high-impedance (HIGH) only when charge current drops to ≤10% of the programmed I_CHG, indicating full charge completion-not intermediate states.

What is the maximum allowable reverse current from BATT to IN?

The MP2603EJ-LF-Z exhibits <2µA reverse current from BATT to IN when IN is grounded or floating and VBATT = 4V. This ultra-low leakage prevents battery drain when the adapter is disconnected, extending standby time in portable systems.

MP2603EJ-LF-Z Specifications

Product attributes: Attribute value

Manufacturer:: Monolithic Power Systems Inc.

Series:: -

Package/Case:: SOT-23-5 Thin, TSOT-23-5

Packaging:: Tape & Reel (TR)

Product Status:: Active

Battery Chemistry:: Lithium Ion/Polymer

Number of Cells:: 1

Current - Charging:: Constant - Programmable

Programmable Features:: Current

Fault Protection:: Over Current, Over Temperature

Charge Current - Max:: 150mA

Battery Pack Voltage:: 4.2V

Voltage - Supply (Max):: 5.25V

Interface:: -

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: TSOT-23-5

MP2603EJ-LF-Z FAQ

1.How can I place an order for MP2603EJ-LF-Z through Aetrix?

Please submit a Request for Quotation (RFQ) for MP2603EJ-LF-Z 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 MP2603EJ-LF-Z reliable?

The price and inventory of MP2603EJ-LF-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2603EJ-LF-Z is usually 5 days.

3.What payment methods are accepted for MP2603EJ-LF-Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2603EJ-LF-Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MP2603EJ-LF-Z?

MP2603EJ-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MP2603EJ-LF-Z 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 MP2603EJ-LF-Z?

For technical support, including MP2603EJ-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2603EJ-LF-Z requirements.

6.How does Aetrix verify that MP2603EJ-LF-Z is sourced from the original manufacturer or authorized distributors?

All MP2603EJ-LF-Z 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 MP2603EJ-LF-Z meets industry standards.

7.What is the process for return or replacement of MP2603EJ-LF-Z?

All MP2603EJ-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2603EJ-LF-Z, 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 MP2603EJ-LF-Z part is unused and in its original packaging.

Return procedure for MP2603EJ-LF-Z:

1.Submit a request within 90 days.

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

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