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PDF ST1S14 Data sheet ( Hoja de datos )
| Número de pieza | ST1S14 | |
| Descripción | Up to 3A step-down switching regulator | |
| Fabricantes | STMicroelectronics | |
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ST1S14
Up to 3 A step-down switching regulator
Datasheet - production data
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Applications
• Factory automation
• Printers
• DC-DC modules
• High current LED drivers
Features
• 3 A DC output current
• Operating input voltage from 5.5 V to 48 V
• 850 kHz internally fixed switching frequency
• Internal soft-start
• Power good open collector output
• Current mode architecture
• Embedded compensation network
• Zero load current operation
• Internal current limiting
• Inhibit for zero current consumption
• 2 mA maximum quiescent current over
temperature range
• 250 mΩ typ. RDS(on)
• Thermal shutdown
Description
The ST1S14 is a step-down monolithic power
switching regulator able to deliver up to 3 A DC
current to the load depending on the application
conditions. The high current level is also achieved
thanks to a HSOP8 package with exposed frame,
that allows to reduce the Rth(JA) down to
approximately 40 °C/W. The output voltage can
be set from 1.22 V. The device uses an internal N-
channel DMOS transistor (with a typical RDS(on) of
200 mΩ) as the switching element to minimize the
size of the external components. The internal
oscillator fixes the switching frequency at 850
kHz. Power good open collector output validates
the regulated output voltage as soon as it reaches
the regulation. Pulse-by-pulse current limit offers
an effective constant current short-circuit
protection. Current foldback decreases overstress
in a persistent short-circuit condition.
Figure 1. Application schematic
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March 2013
This is information on a product in full production.
DocID17977 Rev 2
1/46
www.st.com
46
1 page  
ST1S14
List of figure
Figure 46.
Figure 47.
Figure 48.
Figure 49.
Figure 50.
Figure 51.
Zoom - 1 A to 3 A rising edge load transient (VIN 24 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Zoom - 1 A to 3 A falling edge load transient (VIN 24 V). . . . . . . . . . . . . . . . . . . . . . . . . . . 41
1 A to 3 A load transient (VIN 32 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Zoom - 1 A to 3 A rising edge load transient (VIN 32 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Zoom - 1 A to 3 A falling edge load transient (VIN 32 V). . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Package dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
DocID17977 Rev 2
5/46
5 Page 
ST1S14
Function description
4.1 Power supply and voltage reference
The internal regulator circuit consists of a start-up circuit, an internal voltage pre-regulator,
the bandgap voltage reference, and the bias block that provides current to all the blocks.
The starter supplies the start-up current to the entire device when the input voltage goes
high and the device is enabled (inhibit pin connected to ground). The pre-regulator block
supplies the bandgap cell with a pre-regulated voltage that has a very low supply voltage
noise sensitivity.
4.2 Voltage monitor
An internal block continuously senses the Vcc, Vref, and Vbg. If the monitored voltages are
good, the regulator begins operating. There is also a hysteresis on the VCC (UVLO).
Figure 4. Internal circuit
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4.3 Soft-start
The startup phase minimizes the inrush current and decreases the stress of the power
components at the power up. The startup takes place when VIN crosses the selected UVLO
threshold. A internal counter (2816 clks) sets the soft start time (see Figure 5).
The reference of the error amplifier is ramped smootly in 704 steps (one step every 4 clks).
A low pass filter smooths each step to minimize output discontinuity. Considering the typical
850 kHz switching frequency, the phase two duration is 3.3 msec
The device has full load current capability during the soft start time in order to charge the
output capacitor (see Figure 5).
DocID17977 Rev 2
11/46
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet ST1S14.PDF ] | |
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