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ST1S03PUR
1.5 A, 1.5 MHz adjustable, step-down switching regulator
November 2014 DocID10992 Rev 7 1/16
ST1S031.5 A, 1.5 MHz adjustable, step-down switching regulator
Datasheet - production data
Features Step-down current mode PWM (1.5 MHz)
DC-DC converter 2% DC output voltage tolerance Internal soft-start for STARTUP current
limitation and power on delay of 50 - 100 µs Typical efficiency: > 70% over all operating
conditions 1.5 A output current capability Not switching quiescent current: max 2.5 mA
over temperature range Switch VDS: max. 350 mV at ISW = 750 mA Uses tiny capacitors and inductors Available in DFN6D 3 x 3 mm package with
exposed pad
DescriptionThe ST1S03 is a step-down DC-DC converter
optimized for powering a low voltage digital core
in HDD applications and, generally, to replace the
high current linear solution when the power
dissipation may cause a high heating of the
application environment. It provides up to 1.5 A
over an input voltage range of 3 V to 16 V. A high
switching frequency (1.5 MHz) allows the use of
tiny surface-mount components: as well as the
resistor divider to set the output voltage value,
only an inductor, a Schottky diode and two
capacitors are required. Besides, a low output
ripple is guaranteed by the current mode PWM
topology and by the use of low ESR SMD ceramic
capacitors. The device is thermal protected and
current limited to prevent damages due to an
accidental short-circuit. The ST1S03 device is
available in a DFN6D package.
Table 1. Device summary
Contents ST1S032/16 DocID10992 Rev 7
Contents Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Application notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
DocID10992 Rev 7 3/16
ST1S03 Diagram
1 Diagram
Figure 1. Schematic diagram
Pin configuration ST1S034/16 DocID10992 Rev 7
Pin configuration
Figure 2. Pin connections (top view)
Table 2. Pin description
DocID10992 Rev 7 5/16
ST1S03 Maximum ratings
3 Maximum ratings Note: Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these conditions is not implied.
Table 3. Absolute maximum ratings
Table 4. Thermal data
Electrical characteristics ST1S036/16 DocID10992 Rev 7
4 Electrical characteristics
Table 5. Electrical characteristics (VIN_SW = VIN_A = 5 V, CI = 4.7 µF, CO = 22 µF, L1 = 3.3 µH, TJ = 0 to 125 °C, unless otherwise specified. Typical values are referred to 25 °C) Guaranteed by design, but not tested in production.
DocID10992 Rev 7 7/16
ST1S03 Application notes
5 Application notesThe ST1S03 is an adjustable current mode PWM step-down DC-DC converter with an
internal 1.5 A power switch, housed in a 6-lead DFN 3 x 3 mm package.
It’s a complete 1.5 A switching regulator with its internal compensation eliminating an
additional component.
The constant frequency, current mode, PWM architecture and stable operation with ceramic
capacitors results in a low, predictable output ripple. However, in order to keep the output
regulated, the devices goes in pulse skipping mode when a very light load is required. o clamp the error amplifier reference voltage, a soft-start control block generating a voltage
ramp has been implemented. Besides an on-chip power on reset of 50 = 100 µs ensures the
proper operation when switching on the power supply. Other circuits fitted to the device
protection are the thermal shutdown blocks which turn off the regulator when the junction
temperature exceeds 150 °C typically and the cycle-by-cycle current limiting that provides
protection against shorted outputs.
Being the ST1S03 an adjustable regulator, the output voltage is determined by an external
resistor divider. The desired value is given by the following equation:
VO = VFB [1 + R1 / R2] o make the device working, only other four external components are required: a Schottky
diode, an inductor and two capacitors. The chosen inductor must be able to not saturate at
the peak current level. Besides, its value can be selected keeping in account that a large
inductor value increases the efficiency at a low output current and reduces an output voltage
ripple, while a smaller inductor can be chosen when it is important to reduce the package
size and the total cost of the application. Finally, the ST1S03 device has been designed to
work properly with the X5R or X7R SMD ceramic capacitors both at the input and at the
output. This kind of capacitors, thanks to their very low series resistance (ESR), minimize
the output voltage ripple. Other low ESR capacitors can be used according to the need of
the application without invalidating the right functioning of the device. Due to the high
switching frequency and peak current, it is important to optimize the application environment
reducing the length of the PCB traces and placing all the external components near the
device.
Typical application ST1S03 DocID10992 Rev 7
6 Typical application
Figure 3. Application circuits
