ABLIC launches automotive step-down regulators

The S-19954/5 series is a step-down switching regulator which operates at 5.5V with a 1A output and is housed in an HSNT-8(1616)B package (which is the industry’s smallest package (*1) at 1.6 x 1.6 x t0.41mm).

In addition, while the circuit configuration of conventional switching regulators required five or more external components, the S-19954/5 Series has an integrated feedback resistance circuit (*2) and phase compensation circuit (*3) to set output voltage, which makes it possible to configure an application circuit using just one small coil and two capacitors.

These characteristics allow the S-19954/5 Series to claim the industry’s smallest mounting area (*4), a 45% reduction compared to conventional products, which in turn contributes to downsizing of camera modules.

The series is equipped with a power good function to monitor the output voltage of the IC and ensure it stays within the normal range, so if the output voltage deviates from the specified range, the function raises an error flag to notify the microcontroller, which improves overall system safety.

The S-19954/5 Series is also PPAP (Production Part Approval Process) capable and planned for compliance with Grade 1 of the AEC (*)-Q100 (*Automotive Electronics Council) quality standard for automotive ICs.

Major Features

1. Features the industry’s smallest ultra-compact package, and utilizes fewer peripheral components to achieve the industry’s smallest mounting area

The series operates at 5.5V with a 1A output housed in the industry’s smallest HSNT-8(1616)B (1.6 x 1.6 x t0.41mm) package. This product contributes to downsizing of ECUs, which are being integrated into vehicles in ever-growing quantities. Also available in a gull-wing type HTMSOP-8 (2.9 x 4.0 x t0.8mm) package.

The S-19954/5 Series also has an integrated feedback resistance circuit and phase compensation circuit to set output voltage which allows for configuration of an application circuit with a minimum of just one small coil and two capacitors as peripheral components, and this reduction of components makes it possible to configure application circuits with the smallest mounting area in the industry.

2. Power Good function for improved system safety
The S-19954/5 Series has an integrated overcurrent protection circuit and thermal shutdown circuit in addition to a power good function that monitors output voltage, ensuring it stays within the normal range. The power good function improves system safety by raising an error flag to notify the microcontroller if the output voltage deviates from the specified range.

3. Industry’s top class high efficiency
Theseries has an  efficiency conversion of 95% at an input voltage of 4V and an output voltage of 3.3V).

4. Selectable PWM control or PWM/PFM control
Available with either PWM control (S-19954 Series) or PWM/PFM switching control (S-19955
Series). The S-19955 Series features a proprietary PWM/PFM switching technology with PFM control which is capable of delivering constant voltage output from VOUT without excessive ripple voltage.

Major Specifications

・ Input voltage: 2.7 to 5.5V
・ Output voltage: 0.8 to 3.3V
・ Output current: 1A
・ VOUT pin voltage accuracy: ±1.5%, (Tj = -40℃ to +125℃ )
・ Efficiency: 95% max. ≤
・ Oscillation frequency: 2.25MHz typ.
・ Overcurrent protection function: 1.75A (pulse-by-pulse method)
・ Thermal shutdown function: 170°C detection temperature
・ Short-circuit protection function: selectable either Hiccup control or latch control
・ 100% duty cycle operation
・ Output discharge function: “available” or “unavailable” can be selected for the output discharge function.
・ Power Good function: Nch open-drain output
・ Soft-start function: 0.35ms typ.
・ Under voltage lockout function (UVLO): 2.43V, typ.
・ Operation temperature range: Ta = -40°C to +125°C
・ Lead-free (Sn 100%), halogen-free
・ AEC-Q100 in process (*6)