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PDF ST1S10 Data sheet ( Hoja de datos )
| Número de pieza | ST1S10 | |
| Descripción | monolithic synchronous step-down regulator | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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ST1S10
3 A, 900 kHz, monolithic synchronous step-down regulator IC
DFN8 (4 x 4 mm)
PowerSO-8
Features
Step-down current mode PWM regulator
Output voltage adjustable from 0.8 V
Input voltage from 2.5 V up to 18 V
2% DC output voltage tolerance
Synchronous rectification
Inhibit function
Synchronizable switching frequency from 400
kHz up to 1.2 MHz
Internal soft start
Dynamic short-circuit protection
Typical efficiency: 90%
3 A output current capability
Standby supply current: max. 6 µA over
temperature range
Operative junction temp.: from -40 °C to 125 °C
Applications
Consumer
– STB, DVD, DVD recorders, TV, VCR, car
audio, LCD monitors
Networking
– XDSL, modems, DC-DC modules
Computer
– Optical storage, HD drivers, printers,
audio/graphic cards
Industrial and security
– Battery chargers, DC-DC converters, PLD,
PLA, FPGA, LED drivers
Datasheet - production data
Description
The ST1S10 is a high efficiency step-down PWM
current mode switching regulator capable of
providing up to 3 A of output current. The device
operates with an input supply range from 2.5 V to
18 V and provides an adjustable output voltage
from 0.8 V (VFB) to 0.85 * VIN_SW [VOUT = VFB *
(1 + R1/R2)]. It operates either at a 900 kHz fixed
frequency or can be synchronized to an external
clock (from 400 kHz to 1.2 MHz). The high
switching frequency allows the use of tiny SMD
external components, while the integrated
synchronous rectifier eliminates the need for a
Schottky diode. The ST1S10 provides excellent
transient response, and is fully protected against
thermal overheating, switching overcurrent and
output short-circuit.
The ST1S10 is the ideal choice for point of load
regulators or LDO pre-regulation.
Table 1. Device summary
Order codes
Part number
DFN8 (4 x 4 mm) PowerSO-8
ST1S10
ST1S10PUR
ST1S10PHR
March 2015
This is information on a product in full production.
DocID13844 Rev 6
1/30
www.st.com
1 page  
ST1S10
List of figures
List of figures
Figure 1.
Figure 2.
Figure 3.
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Figure 8.
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Figure 10.
Figure 11.
Figure 12.
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Figure 16.
Figure 17.
Figure 18.
Figure 19.
Figure 20.
Figure 21.
Figure 22.
Figure 23.
Figure 24.
Figure 25.
Figure 26.
Figure 27.
Typical application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Pin connections (top view for PowerSO-8, bottom view for DFN8) . . . . . . . . . . . . . . . . . . . 7
Application schematic for heavy capacitive load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Application schematic for low output voltage (VOUT < 2.5 V) and 2.5 V < VIN < 8 V . . . . . 16
Application schematic for low output voltage (VOUT < 2.5 V) and 8 V < VIN < 16 V . . . . . . 16
PCB layout suggestion - top . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
PCB layout suggestion - bottom . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Voltage feedback vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Oscillator frequency vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Max. duty cycle vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Inhibit threshold vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Reference line regulation vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Reference load regulation vs. temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
ON mode quiescent current vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Shutdown mode quiescent current vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
PMOS ON resistance vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
NMOS ON resistance vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Efficiency vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Efficiency vs. output current at Vout = 5 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Efficiency vs. output current at Vout = 3.3 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Efficiency vs. output current at Vout = 12 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Power SO-8 (exposed pad) package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Power SO-8 (exposed pad) recommended footprint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Power SO-8 (exposed pad) tape and reel dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
DFN8 (4 x 4) package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
DFN8 (4 x 4) tape and reel dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
DocID13844 Rev 6
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5 Page 
ST1S10
5 Application information
Application information
5.1 Description
The ST1S10 is a high efficiency synchronous step-down DC-DC converter with inhibit
function. It provides up to 3 A over an input voltage range of 2.5 V to 18 V, and the output
voltage can be adjusted from 0.8 V up to 85% of the input voltage level. The synchronous
rectification removes the need for an external Schottky diode and allows higher efficiency
even at very low output voltages.
A high internal switching frequency (0.9 MHz) allows the use of tiny surface-mount
components, as well as a resistor divider to set the output voltage value. In typical
application conditions, only an inductor and 3 capacitors are required for proper operation.
The device can operate in PWM mode with a fixed frequency or synchronized to an external
frequency through the SYNC pin. The current mode PWM architecture and stable operation
with low ESR SMD ceramic capacitors results in low, predictable output ripple. No external
compensation is needed.
To maximize power conversion efficiency, the ST1S10 works in pulse skipping mode at light
load conditions and automatically switches to PWM mode when the output current
increases.
The ST1S10 is equipped with thermal shutdown protection activated at 150 °C (typ.).
Cycle-by-cycle short-circuit protection provides protection against shorted outputs for the
application and the regulator. An internal soft start for start-up current limiting and power ON
delay of 275 µs (typ.) helps to reduce inrush current during start-up.
5.2 External components selection
Input capacitor
The ST1S10 features two VIN pins: VIN_SW for the power supply input voltage where the
switching peak current is drawn, and VIN_A to supply the ST1S10 internal circuitry and
drivers.
The VIN_SW input capacitor reduces the current peaks drawn from the input power supply
and reduces switching noise in the IC. A high power supply source impedance requires
larger input capacitance.
For the VIN_SW input capacitor the RMS current rating is a critical parameter that must be
higher than the RMS input current. The maximum RMS input current can be calculated
using the following equation:
Equation 1
IRMS = IO
D
-
2D2
η
D2
η
where is the expected system efficiency, D is the duty cycle and IO is the output DC
current. The duty cycle can be derived using Equation 2.
DocID13844 Rev 6
11/30
30
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet ST1S10.PDF ] | |
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