FHT23030 DC/DC Adjustable Buck Converter Module ( 4.5V–17V Input, 0.9V–6V Output )

Features

3A continuous output current

Input voltage range: 4.5V-17V

Output voltage: 0.9V-6V

CoT control topology

40uA quiescent operating current

Power-saving mode for light-load efficiency

Power good (PG) output indication

Programmable soft-start

Small-size LGA package: (3mm×2.8mm×1.4mm)

Applications

Industrial Equipment

Telecommunications and Networking Systems

Solid State Drives

Description

The FHT23030 is a non-isolated DC/DC power module that provides a complete power solution.

It simplifies design by requiring only a minimal number of resistor and capacitor components for its periphery. With an input voltage range of 4.5~17V and a rated output current of 3A, the output voltage is adjustable, and it

exhibits excellent load regulation and line regulation. To maximize efficiency, the FHT23030 operates in PFM mode with a nominal switching frequency of 2MHz and

automatically enters power-saving mode during light loads.

In power-saving mode, the typical quiescent operating current of the module is 40μA. The FHT23030 features comprehensive protection characteristics, including over-current protection (OCP), short-circuit protection (SCP), under-voltage lockout protection (UVLO), and over-temperature protection.

Typical Applications

Pin Configuration

Electrical Characteristics

Input current

Input Current

Note 1: Stresses above those listed in the "Absolute Maximum Ratings" section may cause permanent damage to the device. Prolonged exposure to any of the Absolute Maximum Ratings conditions may affect device reliability and useful life.

Note 2: The maximum continuous output current may be derated due to the junction temperature of the FHT23030.

Note 3: The performance specifications of the FHT23030 are guaranteed over an internal operating temperature range of -40°C to 125°C. Please note that the maximum internal temperature is determined by specific operating conditions in conjunction

 with circuit board layout, the rated thermal resistance of the package, and other environmental factors.

The test conditions are VIN  = 12V ，VOUT = 1.0V，with external capacitors CIN=2x10μF and COUT  = 2x47μF, and a temperature of TA = 25。C ，unless otherwise noted.

The test conditions are VIN = 12V ，VOUT = 1.0V，with external capacitors CIN=2x10μF ，COUT  = 2x47μF ，and a temperature of TA = 25。C，unless otherwise noted.

The test conditions are V_IN  = 12V ，V_OUT = 1.0V，with external capacitors C_IN=2x10μF and C_OUT  = 2x47μF，and a temperature of TA = 25。C ，unless otherwise noted.

The test conditions are VIN = 12V ，VOUT = 1.0V，with external capacitors CIN=2x10μF ，COUT  = 2x47μF ，and a temperature of TA = 25。C，unless otherwise noted.

The test conditions are VIN = 12V ，VOUT = 1.0V，with external capacitors CIN=2x10μF ，COUT  = 2x47μF ，and a temperature of TA = 25。C，unless otherwise noted

The c are VIN = 12V ，VOUT = 1.0V，with external capacitors CIN=2x10μF ，COUT  = 2x47μF ，and a temperature of TA = 25。C，unless otherwise noted.

Operation

The FHT23030 is a synchronous buck DC-DC voltage converter with a switching frequency of 2MHz. It can achieve a continuous output current of 3A within an input voltage range of 4.5V to 17V.

Enable Control (EN)

The FHT23030 can be enabled or disabled by setting the EN pin. When the EN pin is connected to a high level, the module is enabled. When the EN pin is connected to a low level or left floating, the module is disabled. In this mode, the typical input current is 1.5μA. The EN pin can also be used to set the undervoltage lockout (UVLO) threshold of the FHT23030, with the application circuit shown in Figure 1:

Figure 1: Undervoltage Lockout (UVLO) Voltage Divider Circuit

Soft Start (SS)

The soft-start function controls the rise slope of the output voltage within 1ms during startup, which can suppress inrush current. The FHT23030 is capable of starting up with a pre-biased output capacitor. During pre-biased startup, the two power MOSFETs cannot turn on until the internal voltage clamp sets the output voltage higher than the pre-bias voltage. When the FHT23030 is in the off state, undervoltage lockout (UVLO), or thermal shutdown state, the capacitor connected to the SS pin is discharged by an internal resistor. Returning from these states initiates a new soft-start cycle.

The startup slope of the output voltage can be set by the capacitor connected between the SS pin and GND. A constant current of 2.5μA charges the external capacitor. The given soft-start time (TSS) is set by the CSS capacitor, and the calculation formula is shown in Equation (1):

 (1)

Input Undervoltage Lockout (UVLO) Protection

When the input voltage is below 4.2V, the FHT23030 will undergo undervoltage lockout and remain in shutdown mode. If enabled under UVLO conditions, the module will remain in shutdown mode until the input voltage rises above the set threshold. When the input falls below 3.8V, the module will shut down with a hysteresis of 400mV.

Over-Temperature Protection (OTP)

When the junction temperature of the FHT23030 exceeds the threshold of 160°C, the thermal shutdown protection is activated. This protection is non-latching. Once the junction temperature drops to approximately 140°C, the module resumes operation through a soft-start sequence.

Over-Current Protection (OCP)

The FHT23030 features over-current protection to prevent damage under over-current conditions. The over-current protection function is triggered when the valley current reaches 3.6A. When the output drops to approximately 60%, the output is disabled. After a 10ms disable period, the module will restart and initiate a new soft-start cycle.

Power Good Output Indicator (PGOOD)

The PGOOD pin is an open-drain output. When the FB voltage is less than 92% of the nominal internal reference voltage, the PG pin is driven low. When the FB voltage is greater than 96% of the nominal internal reference voltage, the PG pin becomes high-impedance.

Table 1: Power Good Pin Logic Table

Application Information

Output Voltage Setting

The output voltage of the FHT23030 is set by an external feedback resistor divider, with the formula shown in Equation (2). The voltage regulation circuit is illustrated in Figure 2. 

Figure 2: Voltage Divider Resistors for Setting the Output Voltage

Package Description

Soldering and Storage Precautions

Notes:

1. Please do not place the module on the bottom side of the board during reflow soldering to avoid it falling off.

2. For bulk and unpackaged products, store them in a desiccator(with a relative humidity of less than 10% inside). For products still in their original packaging, try to store them in a desiccator as well.

3.Before mounting the module on the board, strictly follow the baking conditions to dry the samples: bake at 125°C for more than 48 hours and control the reflow soldering temperature within 245°C.