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ST1S09PUR

2 A, 1.5 MHz PWM step-down switching regulator with synchronous rectification

Manufacturer:

STMicroelectronics
Mfr.Part #:

ST1S09PUR
Datasheet:

ST1S09PUR Datasheet (PDF)
Function:

Step-Down
Output Configuration:

Positive
Topology:

Buck
Output Type:

Adjustable
EDA/CAD Models:

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ST1S09PUR General Description

The ST1S09 is a step-down DC-DC converter optimized for powering low output voltage applications. It supplies a current in excess of 2 A over an input voltage range from 2.7 V to 6 V.A high PWM switching frequency (1.5 MHz) allows the use of tiny surface-mount components.Moreover, since the required synchronous rectifier is integrated, the number of the external components is reduced to minimum: a resistor divider, an inductor and two capacitors. The Power Good function continuously monitors the output voltage. An open drain Power Good flag is released when the output voltage is within regulation. In addition, 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 thermally protected and the output current limited to prevent damages due to accidental short circuit. The ST1S09 is available in the DFN6 (3 x 3 mm) package.2 A / 3.3 V high-efficiency synchronous buck con.

Key Features

Operating junction temp. -30 °C to 125 °C
Utilizes tiny capacitors and inductors
Available in DFN6 (3 x 3 mm) exposed pad
Non switching quiescent current: (typ) 1.5 mA over temperature range
Integrated output over-voltage protection
1.5 MHz fixed frequency PWM with current control mode
Typical efficiency: > 90%
2 A output current capability
Two versions available: power good or inhibit
R_DSON (typ) 100 mΩ
2 % DC output voltage tolerance

Specifications

Function	Step-Down	Output Configuration	Positive
Topology	Buck	Output Type	Adjustable
Number of Outputs	1	Voltage - Input (Min)	2.7V
Voltage - Input (Max)	6V	Voltage - Output (Min/Fixed)	0.8V
Voltage - Output (Max)	5.22V	Current - Output	2A
Frequency - Switching	1.5MHz	Synchronous Rectifier	Yes
Operating Temperature	-30°C ~ 85°C (TJ)	Mounting Type	Surface Mount
Base Product Number	ST1S09