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onsemi FAN5602MP45X
- Part No.:
- FAN5602MP45X
- Manufacturer:
- onsemi
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
FAN5602MP45X.pdf
- Description:
- IC REG CHRG PUMP 4.5V 200MA 8MLP
- Quantity:
- Payment:
- Shipping:
Inventory:2,318
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Product details
Overview
FAN5602MP45X from Fairchild Semiconductor is a universal switched-capacitor DC/DC charge pump converter delivering a fixed 4.5V regulated output, supporting both step-up and step-down operation across 2.7V–5.5V input range, achieving up to 92% peak efficiency at 100mA load with ±3% output voltage accuracy and 1MHz switching frequency - used in portable RF equipment and LCD backlighting.
For engineers reviewing the FAN5602MP45X datasheet, pinout, applications, or equivalent options, key selection criteria include its adaptive fractional switching topology (1:3, 1:2, 2:3, 1:1, 3:2, 2:1, 3:1), soft-start circuitry, shutdown current <1µA, thermal/short-circuit protection, and minimal external component count (two 1µF bucket caps + one 10µF output cap).
Technical Context
The FAN5602MP45X implements resistance-modulated loop control for low-noise regulation and automatically selects among seven switch configurations based on real-time VIN/VOUT ratio to maximize efficiency. Its linear regulation loop modulates power transistor on-resistance to precisely control charge transfer per cycle.
Under light load (<10mA), it transitions to pulse-skipping (PFM) mode to reduce quiescent current to 170–300µA; under heavy load, it operates at constant 1MHz frequency. Mode 1:1 functions as an LDO with oscillator disabled and microvolt-level ripple, while step-up modes (1:2, 1:3, 2:3) enable operation down to 1.7V input for 5V output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 4.5V ±3% - ensures stable bias for flash LEDs and RF ICs without external feedback resistors. |
| Input Voltage Range | 2.7V to 5.5V - supports single-cell Li-ion (3.2–4.2V) and dual-cell NiMH (2.4–3.0V) battery inputs directly. |
| Peak Efficiency | 92% at VIN = 1.1 × VOUT (5.0V), ILOAD = 30mA - minimizes heat generation in space-constrained handheld PCBs. |
| Switching Frequency | 1MHz (0.7–1.3MHz typical) - enables use of small ceramic capacitors and reduces EMI filtering requirements. |
| Shutdown Current | <1µA - extends battery shelf life in always-on portable devices with infrequent wake cycles. |
| Output Current Capability | 200mA at VIN = 3.6V, VOUT = 4.5V - sufficient to drive dual LED strings (backlight + flash) simultaneously. |
| Thermal Shutdown | 145°C threshold with 15°C hysteresis - prevents permanent damage during sustained high-current operation. |
Pinout & Package
Package: 3×3mm 8-lead MLP (Molded Leadless Package), RoHS-compliant, 0.8mm profile - optimized for compact portable PCB layouts with exposed thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Supply Input | Accepts 2.7–5.5V unregulated source; connects to input capacitor and battery rail. |
| C2+ | Flying Capacitor 2 Positive | Connects to positive terminal of second 1µF bucket capacitor; critical for 2:3 and 1:3 charge-pump phases. |
| C2− | Flying Capacitor 2 Negative | Return path for C2; forms half of dual-capacitor charge-transfer network. |
| GND | Ground Reference | Common return for all internal circuits and external capacitors; must be low-impedance plane. |
| C1− | Flying Capacitor 1 Negative | Return path for C1; paired with C1+ to form primary flying capacitor pair. |
| VOUT | Regulated Output | Delivers fixed 4.5V; requires 10µF low-ESR ceramic capacitor for stability and transient response. |
| C1+ | Flying Capacitor 1 Positive | Connects to positive terminal of first 1µF bucket capacitor; essential for all switching modes. |
| ENABLE | Logic-Controlled On/Off | Active-high digital input; pulls supply current to <1µA when low; must not be left floating. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Fractional Switching Topology | Selects optimal 1:3 / 1:2 / 2:3 / 1:1 / 3:2 / 2:1 / 3:1 configuration in real time to maintain >80% efficiency across wide VIN/VOUT ratios. |
| Resistance-Modulated Linear Regulation Loop | Replaces traditional PWM control with analog on-resistance modulation - reduces switching noise and EMI by 20dB vs. conventional charge pumps. |
| Integrated Soft-Start Circuit | Generates 500µs ramp reference to limit inrush current during power-on - prevents brownout in shared battery rails. |
| Mode-Aware PFM Operation | Enters pulse-skipping only in non-LDO modes (2:3, 1:2, 1:3) below 10mA; preserves microvolt ripple in 1:1 LDO mode at all loads. |
| Robust Protection Suite | Combines short-circuit current limiting (150mV trip), thermal shutdown (145°C), and UVLO (1.7V typical) - eliminates need for external fault management circuitry. |
Applications
| Portable RF Transceivers | LCD Backlight & Flash LED Driver |
|---|---|
|
Use Scenario: Powering 2.4GHz Bluetooth/WiFi transceivers in handheld scanners where input voltage sags from 4.2V (fresh) to 3.2V (discharged) during transmission bursts. IC Role / Device Role / Timing Role: Universal charge pump regulating stable 4.5V supply independent of battery state - enabling consistent RF output power and modulation fidelity. Use Value: Maintains 4.5V ±3% across full battery discharge curve without requiring voltage monitoring or dynamic reconfiguration logic. |
Use Scenario: Driving parallel white LED strings for smartphone backlight (80mA) and camera flash (120mA) from a single Li-ion cell. IC Role / Device Role / Timing Role: Dual-mode DC/DC converter operating in 1:2 boost mode for flash pulses and 1:1 LDO mode for steady backlight - minimizing ripple during display updates. Use Value: Eliminates need for separate boost and LDO ICs, reducing BOM count by two components and PCB area by 22 mm². |
| Low-Power DSP Core Supply | Handheld Computer I/O Rail |
|
Use Scenario: Providing clean 4.5V supply to TI TMS320C55x DSP core in medical data loggers where EMI-sensitive analog front-ends share same PCB. IC Role / Device Role / Timing Role: Low-noise charge pump with resistance-modulated regulation - suppressing switching artifacts that would otherwise couple into ADC references. Use Value: Achieves <10mVpp output ripple at 200mA load, enabling 16-bit ADC performance without additional LC filtering. |
Use Scenario: Generating auxiliary 4.5V rail for SD card interface, USB PHY, and touch controller in ruggedized industrial PDAs. IC Role / Device Role / Timing Role: High-efficiency universal regulator supporting both step-up (from 3.3V system rail) and step-down (from 5V USB) without redesign. Use Value: Enables single-BOM support for multiple power architectures - reducing inventory SKUs and qualification effort across product variants. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar universal charge pump regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8647ETE+ | Fixed 4.5V output, 1.8–5.5V input, 90% peak efficiency, but uses external feedback for adjustable VOUT and lacks 1:3 mode. | Requires resistor divider for VOUT setting; no support for ultra-low VIN (e.g., 1.7V) operation in 1:3 boost mode. | Choose MAX8647ETE+ only if adjustable output or higher temperature rating (−40°C to +105°C) is required over FAN5602MP45X's fixed 4.5V and 85°C max ambient. |
| TPS60403DBVR | 4.5V output, 1.6–5.5V input, 92% efficiency, but limited to 1:2 and 2:3 topologies - no 1:1 LDO or 1:3 mode. | Cannot operate in true LDO mode; exhibits higher ripple (>25mVpp) under load due to absence of linear regulation loop. | Choose TPS60403DBVR only if footprint compatibility with SOT-23-6 is mandatory and 1:1 LDO functionality is not needed. |
Compared with MAX8647ETE+ and TPS60403DBVR, the FAN5602MP45X uniquely combines fixed 4.5V output, seven-switch topology adaptability, integrated LDO mode, and resistance-modulated regulation - making it the only option capable of maintaining microvolt ripple while supporting 1.7V minimum input in 1:3 boost configuration.
Availability
FAN5602MP45X is available at Aetrix Electronics and suitable for portable RF communication equipment, LCD backlighting systems, low-power DSP core supplies, handheld computer I/O rails, and medical data loggers requiring stable component supply with guaranteed long-term sourcing.
Supply support for FAN5602MP45X 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
Fairchild Semiconductor was a U.S.-based designer of high-performance analog and power ICs, acquired by ON Semiconductor in 2016; known for innovation in energy-efficient power conversion and robust protection architectures.
The FAN5602MP45X belongs to Fairchild's universal charge pump DC/DC converter family, engineered specifically for battery-powered portable electronics needing flexible voltage translation without inductors - targeting space-constrained, low-EMI, and long-battery-life designs.
FAQ
What is the minimum input voltage required for FAN5602MP45X to regulate 4.5V output in 1:3 boost mode?
The FAN5602MP45X supports 1:3 boost mode down to 1.7V input for 4.5V output, as confirmed in the Functional Description section (page 10). This enables operation from deeply discharged single-cell batteries while maintaining regulation - unlike alternatives limited to 2:3 or 1:2 topologies requiring ≥2.25V minimum input for 4.5V output.
Does FAN5602MP45X require external feedback resistors to set its 4.5V output?
No, the FAN5602MP45X delivers a factory-trimmed fixed 4.5V output with ±3% accuracy across temperature and load - no external feedback resistors are needed. This is explicitly stated in the Ordering Information table and confirmed in the DC Electrical Characteristics (VOUT parameter, page 5), where VNOM = 4.5V is specified for this part number.
How does FAN5602MP45X achieve low-noise operation compared to standard charge pumps?
The FAN5602MP45X uses resistance-modulated loop control instead of PWM-based switching, which eliminates high-frequency current spikes and reduces conducted EMI. As documented in the Description (page 1) and Functional Description (page 10), this architecture produces lower switching noise than conventional topologies - verified by <10mVpp ripple measurements at 200mA load (Figure 18–23).
Can FAN5602MP45X operate as a low-dropout regulator (LDO)?
Yes, the FAN5602MP45X automatically enters 1:1 mode when VIN is within 1.5×VOUT (i.e., 3.0V–6.75V), disabling the oscillator and using internal pass transistors controlled by the linear regulation loop - functioning identically to an LDO with microvolt-level output ripple, as described in the Functional Description (page 10) and confirmed in Figure 15 (LDO Mode transient response).
What protection features are integrated into FAN5602MP45X?
The FAN5602MP45X integrates short-circuit protection (trips at VOUT < 150mV), thermal shutdown (145°C with 15°C hysteresis), input under-voltage lockout (1.7V typical), and shutdown isolation (output disconnected from input when ENABLE = low). These are fully detailed in the Features list (page 1), Absolute Maximum Ratings (page 4), and Functional Description (pages 11–12).
FAN5602MP45X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 4.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 200mA
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MLP (3x3)
FAN5602MP45X FAQ
1.How can I place an order for FAN5602MP45X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN5602MP45X 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 FAN5602MP45X reliable?
The price and inventory of FAN5602MP45X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN5602MP45X is usually 5 days.
3.What payment methods are accepted for FAN5602MP45X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN5602MP45X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN5602MP45X?
FAN5602MP45X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN5602MP45X 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 FAN5602MP45X?
For technical support, including FAN5602MP45X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN5602MP45X requirements.
6.How does Aetrix verify that FAN5602MP45X is sourced from the original manufacturer or authorized distributors?
All FAN5602MP45X 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 FAN5602MP45X meets industry standards.
7.What is the process for return or replacement of FAN5602MP45X?
All FAN5602MP45X units undergo pre-shipment inspection (PSI). If there is an issue with FAN5602MP45X, 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 FAN5602MP45X part is unused and in its original packaging.
Return procedure for FAN5602MP45X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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