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STMicroelectronics Electronic Components Datasheet

ST1S10 Datasheet

monolithic synchronous step-down regulator

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ST1S10 pdf
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


STMicroelectronics Electronic Components Datasheet

ST1S10 Datasheet

monolithic synchronous step-down regulator

No Preview Available !

ST1S10 pdf
Contents
Contents
ST1S10
1 Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.2 External components selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Input capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.3 Output capacitor (VOUT > 2.5 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
5.4 Output capacitor (0.8 V < VOUT < 2.5 V) . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.5 Output voltage selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.6 Inductor (VOUT > 2.5 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.7 Inductor (0.8 V < VOUT < 2.5 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.8 Function operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.8.1 Sync operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.8.2 Inhibit function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.8.3 OCP (overcurrent protection) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.8.4 SCP (short-circuit protection) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.8.5 SCP and OCP operation with high capacitive load . . . . . . . . . . . . . . . . 14
6 Layout considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Thermal considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
8 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2/30 DocID13844 Rev 6


Part Number ST1S10
Description monolithic synchronous step-down regulator
Maker STMicroelectronics
Total Page 30 Pages
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