BQ25606RGER

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1. Describe

BQ25606 is a highly integrated standalone 3.0- Switch mode battery charge management and Single-machine system power path management device Battery lithium ion and lithium polymer battery. BQ25606 has a fast charging function, supports high input voltage, and is suitable for various independent chargers and Portable equipment. Its input voltage and current regulation can provide the maximum charging power for the battery. it is also A bootstrap diode for high-side gate drive is integrated to simplify system design. The device supports a variety of input sources, including standard USB host ports, USB charging ports and USB compatible with high voltage adapter. The device sets the default input current limit according to the built-in USB interface. The device complies with USB 2.0 and USB 3.0 power specifications in terms of input current and voltage Regulation. When the built-in USB interface recognizes that the input adapter is unknown, The device is determined by the resistance value set by the ILIM pin. The device also complies with USB On-the-Go (OTG) By providing 5.15 V on VBUS and a constant current limit of up to 1.2 A operating power rating specification. Power path management adjusts the system to slightly higher than the battery voltage but not lower The minimum system voltage of 3.5V. With this feature, the system can keep running even when the battery is low Completely exhausted or removed. When the input current limit or voltage limit is reached, the power path The management automatically reduces the charging current. As the system load continues to increase, the power path discharges the battery until the system power requirements are met. This supplementary mode can prevent The input source is overloaded. The device starts and completes a charging cycle without software control. It senses the battery voltage and The battery is charged in three stages: pre-conditioning, constant current and constant voltage. At the end of The charging cycle, when the charging current is lower than the preset limit, the charger automatically terminates, and The battery voltage is higher than the charge threshold. If a fully charged battery is lower than charged Threshold, the charger automatically starts another charging cycle. The charger provides various safety functions for battery charging and system operation, including: Negative temperature coefficient thermistor monitoring, charging safety timer, overvoltage and overcurrent Safeguard. When the junction temperature exceeds 110°C, thermal regulation will reduce the charging current. this The STAT output reports the charging status and any fault conditions. Other safety features include battery temperature Detect charge and boost mode, thermal regulation and thermal shutdown, and input UVLO and overvoltage protect. The device is available in a 24-pin, 4 mm x 4 mm QFN package.

2. Feature

    1. High-efficiency, 1.5MHz, synchronous switch-mode step-down charger

        – 92% charging efficiency from 5V input at 2A

        – Optimized for USB voltage input (5 V)

    2. Support USB On-The-Go (OTG)

        – Boost converter with output up to 1.2A

        – Improve efficiency by 92% at 1A output

        – Precise constant current (CC) limit

        – Soft-start capacitive loads up to 500µF

        – Output short circuit protection

    3. Single input, support USB input and high voltage adapter

        – Support input voltage range from 3.9V to 13.5V With 22V absolute maximum input voltage score

        – Maximum power tracking by input voltage limit Up to 4.6 V (VINDPM)

        – VINDPM threshold automatically tracks battery Voltage

        – Automatically detect USB SDP, DCP and non-standard adapter

    4. 19.5mΩ high battery discharge efficiency Battery discharge MOSFET

    5. Narrow DC (NVDC) power path management

        – No need for battery or deep use, ready to use Discharged battery

        – Ideal diode operation in battery replenishment model

    6. High integration includes all MOSFETs, current Sensing and loop compensation

    7. 58µA low battery leakage current system Voltage standby

    8. High accuracy

        – ±0.5% charging voltage adjustment

        – ±6% at 1.2A and 1.8A charging current Regulation

        – ±5% at 0.5-A, 1.2-A and 1.8-A input current Regulation

    9. Safety related certification:

        – IEC 62368-1 CB certification

3. Application

    1. EPOS, portable speaker

    2. Mobile phone accessories

    3. Medical equipment

4. Pin Configuration 

5. Pin Functions

6. Feature Description

1. Device Power Up from Battery without Input Source

If only battery is present and the voltage is above depletion threshold (VBAT _DPL_RISE), the BATFET turns on and connects battery to system. The REGN stays off to minimize the quiescent current. The low RDSON of BATFET and the low quiescent current on BAT minimize the conduction loss and maximize the battery run time. The device always monitors the discharge current through BATFET (Supplement Mode). When the system is overloaded or shorted (IBAT > IBATFET_OCP), the device turns off BATFET immediately until the input source plugs in again.

2. Power Up from Input Source

When an input source is plugged in, the device checks the input source voltage to turn on REGN LDO and all the bias circuits. It detects and sets the input current limit before the buck converter is started. The power-up sequence from input source is as listed:

 - Power up REGN LDO

 - Poor source qualification

 - Input source type detection is based on D+/D– to set input current limit (IINDPM) .

 - Input voltage limit threshold setting (VINDPM threshold)

 - Converter power up

7. Converter Power Up

After the input current limit is set, the converter is enabled and the HSFET and LSFET start switching. If battery charging is disabled, BATFET turns off. Otherwise, BATFET stays on to charge the battery. The device provides soft start when system rail is ramped up. When the system rail is below 2.2 V, the input current is limited to is to 200 mA . After the system rises above 2.2 V, the device limits input current to the value set by ILIM pin. As a battery charger, the device deploys a highly efficient 1.5 MHz step-down switching regulator. The fixed frequency oscillator keeps tight control of the switching frequency under all conditions of input voltage, battery voltage, charge current and temperature, simplifying output filter design. The device switches to PFM control at light load or when battery is below minimum system voltage setting or charging is disabled.

8. Application Information

A typical application consists of the device configured as a stand-alone power path management device and a single cell battery charger for Li-Ion and Li-polymer batteries used in a wide range of Smartphone and other portable devices. It integrates an input reverse-block FET (RBFET, Q1), high-side switching FET (HSFET, Q2), low-side switching FET (LSFET, Q3), and battery FET (BATFET Q4) between the system and battery. The device also integrates a bootstrap diode for the high-side gate drive.