MP2104DQT-LF

更新时间： 2024-01-30 06:09:15

品牌	Logo	应用领域
芯源 - MPS		转换器
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10页	445K
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数据手册

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MP2104DQT-LF 数据手册

MP2104 – 1.7MHz 600mA SYNCHRONOUS STEP-DOWN CONVERTER

PIN FUNCTIONS

Pin # Name Description

Regulator Enable Control Input. Drive EN above 1.5V to turn on the MP2104. Drive EN below

0.3V to turn it off (shutdown current < 0.1µA).

GND Ground.

SW Power Switch Output. Inductor connection to drains of the internal PFET and NFET switches.

Supply Input. Bypass to GND with a 2.2µF or greater ceramic capacitor.

Feedback Input (MP2104DJ). Connect FB to the center point of the external resistor divider. The

feedback threshold voltage is 0.6V.

Output Voltage Sense Input (MP2104DJ-1.5 and MP2104DJ-1.8). An internal resistor divider is

connected to this pin to set the proper output voltage.

OUT

OPERATION

The MP2104 is a constant frequency current

mode PWM step-down converter. The MP2104

is optimized for low voltage, Li-Ion battery

powered applications where high efficiency and

small size are critical. The MP2104 uses an

external resistor divider to set the output

voltage from 0.6V to 6V. The device integrates

both a main switch and a synchronous rectifier,

which provides high efficiency and eliminates

an external Schottky diode. The MP2104 can

achieve 100% duty cycle. The duty cycle D of a

step-down converter is defined as:

V_OUT

D = T_ON× f_OSC×100% ≈

×100%

V_IN

Where T_ONis the main switch on time, f_OSCis

the oscillator frequency (1.7MHz), V_OUTis the

output voltage and V_INis the input voltage.

BIAS

IAMP

10X

VOLTAGE

REFERENCE

CURRENT

SENSE

AMP

ICS

0.6V

PWM

OSC

SLOPE COMP

EAO

PWMCMP

FEEDBACK

MAIN

ERROR EAMP

SWITCH

(PCH)

AMP

PWM

CONTROL

LOGIC

17pF

SYNCHRONOUS

RECTIFIER

(NCH)

1.7MHz

OSCILLATOR

GND

MP2104_BD01

Figure 1—Functional Block Diagram (MP2104)

MP2104 Rev. 1.3

10/4/2005

www.MonolithicPower.com

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

1...3 4 567 8 9 10

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