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Silicon Labs EFP0101GM20-E
- Part No.:
- EFP0101GM20-E
- Manufacturer:
- Silicon Labs
- Category:
- Power Management - Specialized
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
EFP0101GM20-E.pdf
- Description:
- EFP0101 WIRED BUCK PMIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,040
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Product details
Overview
EFP0101GM20-E from Silicon Labs is a highly integrated, ultra-low-quiescent-power PMIC designed for battery-powered EFM32/EFR32 microcontroller systems. It delivers four regulated outputs - one configurable buck/boost DC-DC (VOA), one buck-only DC-DC with parallel LDO (VOB), one standalone LDO (VOC), and one firmware-controlled switched output (VOA_SW) - supporting input voltages from 1.8 V to 5.5 V and achieving up to 94% efficiency. Its lossless coulomb counter enables precise battery charge monitoring in IoT sensors and metering applications.
For engineers reviewing the EFP0101GM20-E datasheet, EFP0101GM20-E pinout, EFP0101GM20-E application, or EFP0101GM20-E equivalent, this page provides verified technical context, exact pin functions, confirmed operating modes (wired buck configuration at startup), validated alternatives, and real-world design implications for energy-constrained embedded systems.
Technical Context
The EFP0101GM20-E implements a wired-buck DC-DC A converter (not buck/boost or boost-only), with fixed 1.858 V VOB startup voltage and programmable VOA output (1.7–5.2 V). It integrates lossless coulomb counting, I²C-configurable energy modes (EM0/EM2/EM4), and an IRQ pin for host notification - all while maintaining 300 nA quiescent current with one output enabled.
Its QFN20 3×3 mm package hosts dedicated power rails: VOA supplies core logic, VOB powers RF/peripheral subsystems, VOC serves as auxiliary or low-noise bias, and VOA_SW enables zero-leakage shutdown of external circuitry. Safety features include UVLO (1.2 V threshold), over-temperature IRQ, and short-circuit tolerant outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8 V to 5.5 V - supports single Li/MnO₂, dual alkaline, USB, and other common primary/rechargeable sources without external regulation. |
| VOA Output Voltage | 1.7 V to 5.2 V - digitally programmable via VOA_V register (step = 30.6 mV); enables flexible core voltage scaling for EFM32/EFR32 MCUs. |
| VOB Startup Voltage | 1.858 V - factory-programmed fixed output; eliminates need for external resistor dividers in wired-buck configuration. |
| Quiescent Current (EM2) | 300 nA with one output enabled - enables multi-year battery life in always-on sensor nodes with periodic wake-up. |
| Efficiency | Up to 94% - achieved in high-load buck operation; critical for extending runtime in compact, sealed IoT endpoints. |
| Coulomb Counter | Lossless (no sense resistor) - measures charge flow directly through internal current paths; enables accurate state-of-charge estimation without board area penalty. |
| Package | QFN20 3×3 mm, 0.5 mm pitch - surface-mount compatible with standard reflow profiles; thermal pad improves power dissipation in space-constrained designs. |
Pinout & Package
Package: QFN20 (3 mm × 3 mm, 0.5 mm pitch), thermally enhanced with exposed pad (GND connection required for thermal and electrical performance).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDA | Analog supply input | Primary analog domain input (1.8–5.5 V); powers ADC, coulomb counter, and internal references - must be filtered per datasheet layout guidelines. |
| VDDB | Power input for DC-DC B & LDOs | Supplies DCDC B, LDO B, and LDO C; decoupling required near pin to stabilize switching noise. |
| VOA | Main regulated output (buck) | Configurable 1.7–5.2 V rail; powers MCU core or high-current peripherals; requires external inductor and output capacitor. |
| VOB | Secondary regulated output | Fixed 1.858 V at startup (0.8–3.3 V programmable); powers RF transceivers or low-voltage peripherals; shares VDDB input path. |
| VOC | Tertiary LDO output | 1.7–3.3 V linear regulator; low-noise option for analog sensors or clock buffers; can be paralleled with VOA for improved light-load efficiency. |
| VOA_SW | Firmware-controlled switch | Open-drain output enabling full power-down of external high-leakage circuits (e.g., sensors, radios) during EM2/EM4 sleep modes. |
| I2C_SDA / I2C_SCL | I²C bidirectional data/clock | Standard-mode (100 kHz) and fast-mode (400 kHz) interface; used for dynamic voltage configuration, mode control, and status readback. |
| IRQ | Interrupt request output | Active-low open-drain signal notifying host MCU of events: coulomb threshold exceeded, over-temperature, UVLO, or conversion completion. |
| GND | Ground reference | Common return for analog/digital domains; exposed thermal pad must be soldered to PCB ground plane for thermal integrity and noise reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Wired Buck Configuration | Factory-set BB_CTRL3.BB_MODE = 6 ensures deterministic buck-only operation - eliminates mode transition artifacts and simplifies validation for stable 1.858 V VOB delivery. |
| Firmware-Programmable VOA_SW | Enables complete isolation of external leakage paths (e.g., sensor bias networks) during deep-sleep modes - reduces system standby current to sub-µA levels. |
| Lossless Coulomb Counting | Measures charge transfer without series sense resistor - preserves board space, avoids power loss, and eliminates resistor tolerance errors in battery gauging. |
| Ultra-Low EM2 Quiescent Current | 300 nA with single output active - extends battery life in maintenance-free deployments such as smart meters and environmental monitors. |
| Dedicated IRQ Pin | Hardware-signaled event notification (e.g., temperature alert, charge threshold) eliminates polling overhead and guarantees timely host response in real-time systems. |
Applications
| Smart Utility Metering | Low-Power IoT Sensor Node |
|---|---|
Use Scenario: Battery-powered gas/water meter with 10+ year lifetime requirement and periodic RF transmission. IC Role / Device Role / Timing Role: Primary power manager supplying MCU core (VOA), RF transceiver (VOB), and precision ADC reference (VOC); coulomb counter tracks battery depletion. Use Value: 300 nA EM2 quiescent current + lossless coulomb counting enables accurate end-of-life prediction without sacrificing measurement accuracy or runtime. |
Use Scenario: Wireless temperature/humidity sensor deployed in HVAC ducts with coin-cell battery and BLE connectivity. IC Role / Device Role / Timing Role: Single-chip power solution delivering regulated rails to MCU, sensor IC, and BLE radio; VOA_SW cuts off sensor bias during sleep. Use Value: Firmware-controlled VOA_SW reduces total system sleep current to <1 µA, enabling >5 years operation on CR2032 without capacity derating. |
| Home Security Motion Detector | Wearable Health Monitor |
Use Scenario: PIR-based motion detector with wake-on-event architecture and lithium primary battery. IC Role / Device Role / Timing Role: Powers MCU in EM4 (ultra-deep sleep), wakes it via IRQ on motion detection, then ramps VOA/VOB for processing and transmission. Use Value: EM4 support + IRQ-driven wake-up eliminates continuous polling, reducing average current to ~200 nA between events. |
Use Scenario: Optical heart-rate monitor using photodiode array and analog front-end, powered by Li-MnO₂ button cell. IC Role / Device Role / Timing Role: Supplies clean, low-noise 1.8 V (VOB) to analog sensor chain and 3.0 V (VOA) to MCU; VOC provides isolated bias for photodiode TIA. Use Value: Parallel LDO (VOC) + buck (VOA) architecture minimizes switching noise coupling into sensitive analog measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65270PWP | Single buck + dual LDO; no coulomb counter; 25 µA typical IQ (EM1); QFN24 package | Lacks battery fuel-gauging capability; higher quiescent current limits use in multi-year battery applications | Select when coulomb counting is unnecessary and cost-sensitive designs require proven TI analog integration. |
| MAX77650EWL+ | Single buck + single LDO + charger; 700 nA IQ (shutdown); WLP16 package; includes battery charging | Supports rechargeable Li-ion but adds complexity and footprint; no EM2-equivalent ultra-low-power mode | Prefer for rechargeable wearable systems where charging and compact size outweigh coulomb-counting precision. |
Compared with TPS65270PWP and MAX77650EWL+, the EFP0101GM20-E uniquely combines sub-µA EM2 operation, lossless coulomb counting, and firmware-controllable power gating - making it optimal for primary-cell IoT endpoints requiring long-term autonomy and accurate battery telemetry.
Availability
EFP0101GM20-E is available at Aetrix Electronics and suitable for IoT sensors, smart metering, and home automation devices requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for EFP0101GM20-E 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
Silicon Labs is a fabless semiconductor company specializing in low-power wireless SoCs, timing solutions, and energy-efficient mixed-signal ICs for IoT and embedded markets.
The EFP01 family was designed specifically to extend battery life in EFM32/EFR32-based systems - integrating intelligent power sequencing, coulomb counting, and ultra-low-power modes into a single QFN20 package.
FAQ
What is the default DC-DC A configuration for EFP0101GM20-E at power-up?
The EFP0101GM20-E is factory-configured in Wired Buck mode (BB_CTRL3.BB_MODE = 6) with VOA output set to 1.860 V and VOB output enabled at 1.858 V. This fixed configuration eliminates boot-time uncertainty and simplifies system validation for applications requiring deterministic buck regulation without mode transitions. No firmware initialization is needed to achieve nominal operation.
Does EFP0101GM20-E support battery voltage monitoring on VDDB?
Yes, EFP0101GM20-E supports battery voltage monitoring on the VDDB pin - confirmed in Table 3.1 (OPN-Specific Features) of the datasheet, which lists "Yes, on VDDB" for EFP0101. This enables real-time input voltage tracking for adaptive power management, low-battery warnings, and coulomb counter calibration - all accessible via the integrated ADC and I²C interface.
Can VOA_SW be used to power down external circuitry during EM2 mode?
Yes, the VOA_SW pin on EFP0101GM20-E is explicitly designed for firmware-controlled power gating during EM2 and EM4 modes. When asserted, it disconnects external high-leakage loads (e.g., sensor bias networks, pull-up resistors) from VOA, reducing total system sleep current to sub-microamp levels - a key enabler for multi-year battery life in always-on sensor applications.
What is the maximum output current capability of the VOB rail on EFP0101GM20-E?
The VOB rail on EFP0101GM20-E delivers up to 300 mA in buck mode, as specified in Section 5.1.3 (General Operating Conditions) of the datasheet. This is sufficient to power EFR32 RF transceivers, low-power displays, or multiple peripherals simultaneously - with efficiency maintained above 90% across 10 mA to 300 mA load range under typical 3.3 V input conditions.
Is the coulomb counter in EFP0101GM20-E truly lossless, and how is accuracy maintained?
Yes, the coulomb counter in EFP0101GM20-E is lossless - it measures charge flow using internal current mirrors and integrators, eliminating the need for external sense resistors. Accuracy is maintained via factory-calibrated CC_CAL register values and real-time temperature compensation (via integrated temp sensor), achieving ±2% typical charge measurement error across –40°C to 100°C junction temperature range.
EFP0101GM20-E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Silicon Labs
- Series:
- EFP01
- Package/Case:
- 20-VFQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Applications:
- -
- Current - Supply:
- 24nA
- Voltage - Supply:
- -
- Operating Temperature:
- -40°C ~ 100°C (TJ)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (3x3)
EFP0101GM20-E FAQ
1.How can I place an order for EFP0101GM20-E through Aetrix?
Please submit a Request for Quotation (RFQ) for EFP0101GM20-E 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 EFP0101GM20-E reliable?
The price and inventory of EFP0101GM20-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for EFP0101GM20-E is usually 5 days.
3.What payment methods are accepted for EFP0101GM20-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for EFP0101GM20-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for EFP0101GM20-E?
EFP0101GM20-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your EFP0101GM20-E 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 EFP0101GM20-E?
For technical support, including EFP0101GM20-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your EFP0101GM20-E requirements.
6.How does Aetrix verify that EFP0101GM20-E is sourced from the original manufacturer or authorized distributors?
All EFP0101GM20-E 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 EFP0101GM20-E meets industry standards.
7.What is the process for return or replacement of EFP0101GM20-E?
All EFP0101GM20-E units undergo pre-shipment inspection (PSI). If there is an issue with EFP0101GM20-E, 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 EFP0101GM20-E part is unused and in its original packaging.
Return procedure for EFP0101GM20-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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