Product Summary

The PI37xx series is a ZVS buck-boost switch with high efficiency and wide input voltage range.
It is a switching regulator. High-density SiP (System‑in‑Package) package
The control circuit, semiconductor switches, and other components are integrated.
Masu. The PI37xx uses high performance zero voltage switching (ZVS) circuitry.
A high-performance PoL battery with the highest conversion efficiency in its class.
It is the source. PI37xx only adds an inductor and minimal capacitor
can be used to configure a buck-boost switching regulator.
The ZVS architecture features minimal switching losses and
The goal is to operate at high frequencies while increasing conversion efficiency. switch
Due to the high frequency of the filter, small external filter components can be used to
High density and fast transient response to input/output fluctuations are possible.
vinegar. PI37xx can maintain efficiency even when the input voltage is at the upper limit of the rated value.
Operates at high switching frequency, making it suitable for applications with large transformation ratios.
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Product features

■ Features
• Efficiency: 97% or more (FSW >800kHz)
• Fast transient response
• Can be connected in parallel
• External frequency synchronization/interleave function
• Built-in high-side current sense amplifier
• Built-in general purpose amplifier
• Input overvoltage/undervoltage lockout (OVLO/UVLO)
• Output overvoltage protection (OVP)
• Overtemperature protection (OTP)
• Fast/slow current limit
• Operating temperature range
- LGIZ: –40 ~ 115°C (TJ)
- LGMZ: –55 ~ 115°C (TJ)Applications

package

■High-density SiP (System‑in‑Package)
Control circuits, semiconductor switches, and other components are integrated.

＜LGA SIP＞10 x 14 x 2.5mm

efficiency

PI3740, 12VOUT Efficiency 95% Ta=25℃

PI3741-01, 48VOUT Efficiency 97% Ta=25℃

circuit configuration

Standard circuit configuration

Evaluation Board

Product lineup

Special specification example - constant voltage (CV)/constant current (CC) mode

CV/CC mode peripheral circuit connection diagram

Internal monitor block diagram

Lighting (LGH) mode allows the PI3740-00 product to operate in constant current mode (CC), supporting a wide range of applications that require the ability to regulate current or voltage.

Key applications are LED lighting, battery/supercapacitor charging, and high peak current pulsed transient load applications.

The PI3740-00 product family can operate in dual mode as a constant voltage (CV) regulator or constant current (CC) regulator. Both modes are available on one system.

The PI3740-00 has a separate current amplifier called LGH, which internally incorporates a 100mV lighting reference with its output connected to the EAO pin.

When the current through the external shunt starts to reach 100mV at the LGH pin, the LGH amplifier takes over regulation by pulling down the EAO output until the current is regulated according to the designed shunt value.

LGH amplifiers are sink-only transconductance amplifiers (TCA). Does not supply current.

When the LED string is open or the current signal is open, you can set up a voltage loop to adjust the output voltage to a safe or desired value in CV mode.

When using CC mode, it is important to set R1 and R2 appropriately to avoid interaction between the voltage and current loops.

In this case, the EAIN pin voltage setting must be set such that the error between it and the 1.7V reference is sufficient to force the EAO into open loop and always source current.

If an LGH amplifier is not used, the LGH pin must be connected to SGND.

The LGH amplifier can sink more current than the error amplifier can source, thus avoiding arbitration problems when transitioning from LGH mode to voltage mode.

Inquiry

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