MP2309 datasheet(2/10 Pages) MPS

2 / 10 page

MP2309 – 1A, 23V, 340KHz SYNCHRONOUS RECTIFIED STEP-DOWN CONVERTER

MP2309 Rev. 1.4

www.MonolithicPower.com

3/13/2006

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

PACKAGE REFERENCE

GND

COMP

TOP VIEW

MP2309_PD01_SOIC8

Part Number*

Package

Temperature

MP2309DS

SOIC8

–40° to +85°C

* For Tape & Reel, add suffix –Z (eg. MP2309DS–Z)

For Lead Free, add suffix –LF (eg. MP2309DS–LF–Z)

ABSOLUTE MAXIMUM RATINGS

(1)

Supply Voltage VIN....................... –0.3V to +26V

Switch Voltage VSW.................. –1V to VIN +0.3V

Boost Voltage VBS..........VSW – 0.3V to VSW + 6V

All Other Pins................................. –0.3V to +6V

Junction Temperature...............................150°C

Lead Temperature ....................................260°C

Storage Temperature .............–65°C to +150°C

Recommended Operating Conditions

(2)

Input Voltage VIN............................ 4.75V to 23V

Output Voltage VOUT .................... 0.923V to 20V

Ambient Operating Temperature .... –40°C to +85°C

Thermal Resistance

(3)

θJA

θJC

SOIC8..................................... 90 ...... 45...

°C/W

Notes:

1) Exceeding these ratings may damage the device.

2) The device is not guaranteed to function outside of its

operating conditions.

3) Measured on approximately 1” square of 1 oz copper.

ELECTRICAL CHARACTERISTICS

VIN = 12V, TA = +25°C, unless otherwise noted.

Parameter

Symbol Condition

Min

Typ

Max

Units

Shutdown Supply Current

VEN = 0V

3.0

µA

Supply Current

VEN = 2.0V, VFB = 1.0V

1.3

1.5

Feedback Voltage

VFB

4.75V

≤ VIN ≤ 23V

0.900

0.923

0.946

Feedback Overvoltage Threshold

1.1

Error Amplifier Voltage Gain

(4)

AEA

400

V/V

Error Amplifier Transconductance

GEA

∆IC = ±10µA

800

µA/V

High-Side Switch On Resistance

(4)

RDS(ON)1

140

mΩ

Low-Side Switch On Resistance

(4)

RDS(ON)2

140

mΩ

High-Side Switch Leakage Current

VEN = 0V, VSW = 0V

µA

Upper Switch Current Limit

Minimum Duty Cycle

1.4

Lower Switch Current Limit

From Drain to Source

0.8

COMP to Current Sense

Transconductance

GCS

2.4

A/V

Oscillation Frequency

Fosc1

340

KHz

Short Circuit Oscillation Frequency

Fosc2

VFB = 0V

100

KHz

Maximum Duty Cycle

DMAX

VFB = 0.8V

Minimum On Time

(4)

220

EN Shutdown Threshold

VEN Rising

1.1

1.5

2.0

EN Shutdown Threshold Hysteresis

210

EN Lockout Threshold Voltage

2.2

2.5

2.7

EN Lockout Hysteresis

210

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