ST1S10 STMicroelectronics, ST1S10 Datasheet - Page 2

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ST1S10

Manufacturer Part Number
ST1S10
Description
Monolithic synchronous step-down regulator
Manufacturer
STMicroelectronics
Datasheet

Specifications of ST1S10

Input Voltage Range
2.5 V to 18 V
Max Iout
3 A
High Internal Switching Frequency
900 kHz
Quiescent Current
< 6 μA in inhibit state

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Contents
Contents
1
2
3
4
5
6
7
8
9
10
2/26
Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.1
5.2
5.3
5.4
5.5
5.6
5.7
5.8
Layout considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6.1
Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
External components selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.2.1
Output capacitor (V
Output capacitor (0.8 V < V
Output voltage selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Inductor (V
Inductor (0.8 V < V
Function operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.8.1
5.8.2
5.8.3
5.8.4
5.8.5
Thermal considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Input capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Sync operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Inhibit function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
OCP (over-current protection) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
SCP (short circuit protection) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
SCP and OCP operation with high capacitive load . . . . . . . . . . . . . . . . 12
OUT
> 2.5 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
OUT
OUT
Doc ID 13844 Rev 4
< 2.5 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
> 2.5 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
OUT
< 2.5 V) . . . . . . . . . . . . . . . . . . . . . . . . . 10
ST1S10

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