MP2309

NOT RECOMMENDED FOR NEW DESIGNS

1A, 23V, 340KHz Synchronous Rectified Step-Down Converter with Soft Start

ALTERNATIVE PART

NRFND Datasheet

MP2309 continues to be in production for existing customers. Please consider this alternative for new designs:

MP2392

High-Efficiency, 2A, 4.2 to 24V, 650kHz, Synchronous, DC Step-Down Converter with PG and Soft Start In SOT583

Features & Benefits

Wide 4.2V to 24V Operating Input Range
110mΩ/45mΩ Low R_DS(ON)Internal Power MOSFETs
200µA Low I_Q
High-Efficiency Synchronous Mode Operation
Power-Save Mode (PSM) at Light Load
Fast Load Transient Response
650kHz Switching Frequency
Programmable Soft-Start Time
Power Good (PG) Indication
Output Over-Voltage Protection (OVP)
Over-Current Protection (OCP) and Hiccup
Pre-Bias Start-Up
Thermal Shutdown
Available in a SOT583 (1.6mmx2.1mm) Package

… and many more!

Parameters Description

Vin (min) (V)
4.75
Vin (max) (V)
23
Iout (max) (A)
1
Iq (typ) (mA)
1.3
Vfb (V)
0.923
fsw (max) (kHz)
340
Control Mode
Current Mode
Package (mm)
SOIC-8
Grade
Catalog
Regulated Outputs
1
Vout (min) (V)
0.923
Vout (max) (V)
20
Isw Limit (typ) (A)
2
Max Duty Cycle (%)
0.9

The MP2309 is a monolithic synchronous buck regulator. The device integrates 140mΩ MOSFETS that provide 1A continuous load current over a wide operating input voltage of 4.75V to 23V. Current mode control provides fast transient response and cycle-by-cycle current limit. An adjustable soft-start prevents inrush current at turn-on. Shutdown mode drops the supply current to 1μA. This device, available in an 8-pin SOIC package, provides a very compact system solution with minimal reliance on external components.