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產(chǎn)品型號MP2374DS-LF-Z的概述

芯片MP2374DS-LF-Z的概述 MP2374DS-LF-Z 是一款高效的降壓型 DC-DC 轉換器，廣泛應用于多種電子設備中，以為負載提供所需的穩(wěn)定輸出電壓。該芯片由 Monolithic Power Systems（MPS）公司開發(fā)，針對小型化和高效率的需求進行優(yōu)化。本芯片設計靈活，能夠適應廣泛的輸入電壓范圍，支持多種輸出電流，從而滿足各種應用需求。 MP2374DS-LF-Z 采用先進的電源管理技術，其核心理念是在盡量降低功耗的同時，不妥協(xié)于性能。這使得它特別適用于便攜式設備和布線復雜的電子系統(tǒng)，尤其是在需要長電池壽命的產(chǎn)品中。芯片MP2374DS-LF-Z的詳細參數(shù) MP2374DS-LF-Z 芯片的規(guī)格參數(shù)包括： - 輸入電壓范圍：4.5V 至 18V - 輸出電壓：可調節(jié)，通常為 0.8V 至 15V - 輸出電流：最大可達 3A - 效率：高達 95% - 開關頻率...

產(chǎn)品型號MP2377的Datasheet PDF文件預覽

MP2377

3A, 21V, 600kHz

Step-Down Converter

The Future of Analog IC Technology

DESCRIPTION

FEATURES

The MP2377 is a monolithic step-down switch

mode converter with a built in high-side power

MOSFET. It achieves 3A continuous output

current over a wide input supply range with

excellent load and line regulation.

Wide 4.5V to 21V Operating Input Range

3A Output Current

100m? Internal Power MOSFET Switch

Power Good Indicator

Fixed 600kHz Frequency

Synchronizable to >1MHz External Clock

Over Current Latch Off Protection

Thermal Shutdown

Output Adjustable from 0.81V

Stable with Low ESR Output Ceramic

Capacitors

Available in Thermally Enhanced 8-Pin

SOIC Packages

Supports Soft-Start into Pre-Biased Output

Current mode operation provides fast transient

response and eases loop stabilization.

Fault condition protection includes current limiting

and thermal shutdown.

The MP2377 requires a minimum number of

readily available standard external components

and is available in 8-pin SOIC packages with

exposed pad.

APPLICATIONS

Distributed Power Systems

Battery Charger

Pre-Regulator for Linear Regulators

“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of

Monolithic Power Systems, Inc.

TYPICAL APPLICATION

Efficiency vs

Load Current

BST

100

=5V

VCC

=12V

MP2377

POWER

GOOD

EN/SYNC

GND

OFF ON

0.5 1.0 1.5 2.0 2.5 3.0 3.5

LOAD CURRENT (A)

MP2377 Rev. 0.92

4/19/2011

www.MonolithicPower.com

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

MP2377 – 3A, 21V, 600KHz STEP-DOWN CONVERTER

PACKAGE REFERENCE

ABSOLUTE MAXIMUM RATINGS ⁽¹⁾

Supply Voltage V_IN....................................... 23V

V_SW.........................-0.3V(-5V for < 10ns) to 24V

V_{BST -}V_SW.................................................... + 6V

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

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

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

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

TOP VIEW

BST

VCC

GND

EN/SYNC

Recommended Operating Conditions ⁽²⁾

Supply Voltage V_IN........................... 4.5V to 21V

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

EXPOSED PAD

ON BACKSIDE

Thermal Resistance ⁽³⁾

θ_JA

θ_JC

SOIC8.....................................90...... 45... °C/W

SOIC8E ..................................50...... 10... °C/W

Part Number*

MP2377DN

Package

Temperature

SOIC8E

–40°C to +85°C

Notes:

For Tape & Reel, add suffix –Z (eg. MP2377DN–Z)

For RoHS Compliant Packaging, add suffix –LF

(eg. MP2377DN–LF–Z)

1) Exceeding these ratings may damage the device.

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

operating conditions.

3) Measured on JESD51-7, 4-layer PCB.

ELECTRICAL CHARACTERISTICS

V_IN= 12V, T_A= +25°C, unless otherwise noted.

Parameters

Symbol Condition

Min

Typ

Max

Units

Feedback Voltage

V_FB

0.788

0.808

100

0.1

0.828

μA

4.5V ≤ V_IN≤ 21V

_FB= 0.8V

V_FB= 2V

Feedback Current

I_FB

Switch On Resistance ⁽⁴⁾

Switch Leakage

R_DS(ON)

V_EN= 0V, V_SW= 0V

Current Limit ⁽⁴⁾

Oscillator Frequency

Fold-back Frequency

Maximum Duty Cycle

f_SW

V_FB= 0.6V

V_FB= 0V

V_FB= 0.6V

600

150

KHz

Minimum On Time (4)

t_ON

100

4.1

880

Under Voltage Lockout Threshold Rising

Under Voltage Lockout Threshold Hysteresis

EN Input Low Voltage

3.9

4.3

0.4

En Input High Voltage

1.2

4.5

_EN= 2V

EN Input Current

μA

V_EN= 0V

0.01

0.1

0.9

150

5.0

0.74

Supply Current (Shutdown)

Supply Current (Quiescent)

Thermal Shutdown

V_EN= 0V

μA

°C

KHz

MHz

μS

V_EN= 2V, V_FB= 1V

Bias Supply

V_CC

_CC= 5mA

Power Good Threshold Rising

Power Good Threshold Hysteresis

PG Pin Level

Sync Frequency Range (Low)

Sync Frequency Range (High)

Enable Turnoff Delay

V_PG

F_SYNCL

F_SYNCH

T_OFF

PG Sink 4mA

0.4

300

1.5

5.0

Note:

4) Guaranteed by design.

MP2377 Rev. 0.92

4/19/2011

www.MonolithicPower.com

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

MP2377 – 3A, 21V, 600KHz STEP-DOWN CONVERTER

PIN FUNCTIONS

Pin #

Name

Description

Switch Output.

Bootstrap. This capacitor is needed to drive the power switch’s gate above the supply

voltage. It is connected between SW and BS pins to form a floating supply across the power

switch driver.

BST

VCC

GND

Bias Supply. Decouple this pin with a 1μF ceramic capacitor.

Ground. This pin is the voltage reference for the regulated output voltage. For this reason

care must be taken in its layout. This node should be placed outside of the D1 to C1 ground

path to prevent switching current spikes from inducing voltage noise into the part.

Feedback. An external resistor divider from the output to GND, tapped to the FB pin sets

the output voltage. To prevent current limit run away during a short circuit fault condition the

frequency foldback comparator lowers the oscillator frequency when the FB voltage is

below 250mV.

Power Good Indicator. Connect this pin to V_CCor V_OUTby a 100k? pull-up resistor. The

output of this pin is low if the output voltage is 10% less than the nominal voltage, otherwise

it is an open drain.

EN/SYNC On/Off Control Input and Synchronization Pin.

Supply Voltage. The MP2377 operates from a +4.5V to +21V unregulated input. C1 is

needed to prevent large voltage spikes from appearing at the input.

MP2377 Rev. 0.92

4/19/2011

www.MonolithicPower.com

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

MP2377 – 3A, 21V, 600KHz STEP-DOWN CONVERTER

TYPICAL PERFORMANCE CHARACTERISTICS

V_IN= 12V, V_OUT= 3.3V, L = 3.3μH, T_A= +25oC, unless otherwise noted.

Efficiency vs

Load Current

Efficiency vs

Load Current

= 3.3V, I

OUT

= 3A

OUT

100

=5V

OUT

=12V

10mV/div.

10V/div.

I indutor

1A/div.

=12V

=5V

OUT

0.5 1.0 1.5 2.0 2.5 3.0 3.5

LOAD CURRENT (A)

0.5 1.0 1.5 2.0 2.5 3.0 3.5

LOAD CURRENT (A)

Steady States

= 12V, V = 3.3V, I

= 0=1.5A

= 12V, V = 3.3V, I

= 3A

OUT

5V/div.

10mV/div.

OUT

2V/div.

10V/div.

I inductor

2A/div.

I inductor

2A/div.

I indcutor

1A/div.

1ms/div.

5V/div.

OUT

2V/div.

10V/div.

I inductor

1A/div.

I inductor

1A/div.

I inductor

2A/div.

1ms/div.

MP2377 Rev. 0.92

4/19/2011

www.MonolithicPower.com

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

MP2377 – 3A, 21V, 600KHz STEP-DOWN CONVERTER

TYPICAL PERFORMANCE CHARACTERISTICS

V_IN= 12V, V_OUT= 3.3V, L = 3.3μH, T_A= +25oC, unless otherwise noted.

5V/div.

OUT

2V/div.

OUT

2V/div.

10V/div.

I inductor

1A/div.

I inductor

2A/div.

I inductor

2A/div.

1ms/div.

2ms/div.

Load Regulation

Line Regulation

Peak Current vs Duty Cycle

1.00%

0.50%

0.00%

-0.50%

-1.00%

1.00%

0.50%

0.00%

-0.50%

-1.00%

=12V, V

=3.3V

OUT

=1.5A

OUT

=5V, V

=3.3V

OUT

=23V V =3.3V

IN OUT

0.00

1.00

2.00

3.00

0.00 5.00 10.00 15.00 20.00 25.00

10% 20% 30% 40% 50% 60% 70%

LOAD CURRENT (A)

INPUT VOLTAGE (V)

CYCLE DUTY (%)

Load Transient

O/AC

50mV/div.

I_inductor

2A/div.

MP2377 Rev. 0.92

4/19/2011

www.MonolithicPower.com

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

MP2377 – 3A, 21V, 600KHz STEP-DOWN CONVERTER

OPERATION

CURRENT SENSE

AMPLIFIER

- -

x40

REGULATOR

BST

OSCILLATOR

600KHz

REGULATOR

REFERENCE

EN/SYNC

VCC

DRIVER

CURRENT

LIMIT

COMPARATOR

0.81 V

REF

POWER

GOOD

PWM

ERROR

AMPLIFIER

COMPARATOR

GND

Figure 1—Functional Block Diagram

The MP2377 is a fixed frequency, step-down

switching regulator with an integrated high-side

power MOSFET. It achieves 3A continuous

output current over a wide input supply range

with excellent load and line regulation. It

provides a single highly efficient solution with

current mode control for fast loop response and

easy compensation.

Error Amplifier

The error amplifier compares the FB pin voltage

with the internal 0.808V reference (REF) and

outputs a current proportional to the difference

between the two. This output current is then

used to charge or discharge the internal

compensation network to form the COMP

voltage, which is used to control the power

MOSFET current. The optimized internal

compensation network minimizes the external

component counts and simplifies the control

loop design.

The MP2377 operates in a fixed frequency,

peak current control mode to regulate the

output voltage. A PWM cycle is initiated by the

internal clock. The integrated high-side power

MOSFET is turned on and remains on until its

current reaches the value set by the COMP

voltage. When the power switch is off, it

remains off until the next clock cycle starts. If, in

90% of one PWM period, the current in the

power MOSFET does not reach the COMP set

current value, the power MOSFET will be

forced to turn off.

Internal Regulator

Most of the internal circuitries are powered from

the 5V internal regulator. This regulator takes

the VIN input and operates in the full VIN range.

When VIN is greater than 5.0V, the output of

the regulator is in full regulation. When VIN is

lower than 5.0V, the output decreases. Since

this internal regulator provides the bias current

for the bottom gate driver that requires

significant amount of current depending upon

the external MOSFET selection, a 1uF ceramic

capacitor for decoupling purpose is required.

Power Good Indicator

When the FB is below 0.74V, the PG pin will be

internally pulled low. When the FB is above

0.74V, the PG becomes an open-drain output.

MP2377 Rev. 0.92

4/19/2011

www.MonolithicPower.com

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

MP2377 – 3A, 21V, 600KHz STEP-DOWN CONVERTER

Enable/Synch Control

Thermal Shutdown

The MP2377 has a dedicated Enable/Synch

control pin (EN/SYNC). By pulling it high or low,

the IC can be enabled and disabled by EN. Tie

EN to VIN for automatic start up. To disable the

part, EN must be pulled low for at least 5μs.

Thermal shutdown is implemented to prevent

the chip from operating at exceedingly high

temperatures. When the silicon die temperature

is higher than 150°C, it shuts down the whole

chip. When the temperature is lower than its

lower threshold, typically 140°C, the chip is

enabled again.

The MP2377 can be synchronized to external

clock range from 300KHz up to 1.4MHz through

the EN/SYNC pin. The internal clock rising

edge is synchronized to the external clock rising

edge.

Floating Driver and Bootstrap Charging

The floating power MOSFET driver is powered

by an external bootstrap capacitor. This floating

driver has its own UVLO protection. This

UVLO’s rising threshold is 2.2V with a

hysteresis of 150mV. The bootstrap capacitor

voltage is regulated internally (Figure 2). Even

at no load condition, as long as V_INis 3V higher

than V_OUT, C4 will have enough voltage

provided by V_INthrough D2, M2 C4, L1 and C2.

If (V_IN-V_SW) is more than 5V, U2 will regulate M2

to maintain a 5V BST voltage across C4.

Under-Voltage Lockout (UVLO)

Under-voltage lockout (UVLO) is implemented

to protect the chip from operating at insufficient

supply voltage. The MP2377 UVLO comparator

monitors the output voltage of the internal

regulator, VCC. The UVLO rising threshold is

about 4.0V while its falling threshold is about

3.6V.

Internal Soft-Start

The soft-start is implemented to prevent the

converter output voltage from overshooting

during startup. When the chip starts, the

internal circuitry generates a soft-start voltage

(SS) ramping up from 0V to 1.2V. When it is

lower than the internal reference (REF), SS

overrides REF so the error amplifier uses SS as

the reference. When SS is higher than REF,

REF regains control.

Over-Current-Protection and Latchoff

The MP2377 has cycle-by-cycle over current

limit when the inductor current peak value

exceeds the set current limit threshold.

Meanwhile, output voltage starts to drop until

FB is below the Under-Voltage(UV) threshold,

typically 30% below the reference. Once a UV

is triggered, the MP2377 is latched off until En

or IN is recycled. This protection mode is

especially useful when the output is dead-short

to ground.

Figure 2—Internal Bootstrap Charging Circuit

Startup and Shutdown

If both VIN and EN are higher than their

appropriate thresholds, the chip starts. The

reference block starts first, generating stable

reference voltage and currents, and then the

internal regulator is enabled. The regulator

provides stable supply for the remaining

circuitries.

Three events can shut down the chip: EN low,

VIN low and thermal shutdown. In the shutdown

procedure, the signaling path is first blocked to

avoid any fault triggering. The COMP voltage

and the internal supply rail are then pulled

down. The floating driver is not subject to this

shutdown command.

MP2377 Rev. 0.92

4/19/2011

www.MonolithicPower.com

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

MP2377 – 3A, 21V, 600KHz STEP-DOWN CONVERTER

APPLICATION INFORMATION

The schematic on the front page shows a typical

MP2377 application. The IC can provide up to

3A output current at a nominal output voltage of

3.3V. For proper thermal performance, the

exposed pad of the device must be soldered

down to the printed circuit board.

Output Rectifier Diode

The output rectifier diode supplies the current to

the inductor when the high-side switch is off. To

reduce losses due to the diode forward voltage

and recovery times, use a Schottky diode.

Choose a diode whose maximum reverse

voltage rating is greater than the maximum

input voltage, and whose current rating is

greater than the maximum load current. Table 2

Setting the Output Voltage

The external resistor divider is used to set the

output voltage (see the schematic on front

page). The feedback resistor R1 also sets the

feedback loop bandwidth with the internal

compensation capacitor (see Figure 1). Choose

R1 to be around 40.2k? for optimal transient

response. R2 is then given by:

lists

example

Schottky

diodes

and

manufacturers.

Table 2—Diode Selection Guide

Voltage/Current

Diode

Rating

30V, 3A

Manufacture

Diodes Inc.

On Semi

R2 =

B330

V_OUT

? 1

MBRS330

0.8V

Selecting the Input Capacitor

Table 1—Resistor Selection for Common

Output Voltages

The input capacitor (C1) reduces the surge

current drawn from the input and the switching

noise from the device. The input capacitor

impedance at the switching frequency should

be less than the input source impedance to

prevent high frequency switching current from

passing to the input. Ceramic capacitors with

V_OUT(V)

1.8

R1 (k?)

40.2 (1%)

R2 (k?)

32.4 (1%)

19.1 (1%)

13 (1%)

2.5

3.3

7.68 (1%)

X5R

X7R

dielectrics

are

highly

recommended because of their low ESR and

small temperature coefficients. For 3A output

applications, a 10μF capacitor is sufficient.

Selecting the Inductor

A 1μH to 10μH inductor with a DC current rating

of at least 25% percent higher than the

maximum load current is recommended for

most applications. For highest efficiency, the

inductor DC resistance should be less than

15m?. For most designs, the inductance value

can be derived from the following equation.

Selecting the Output Capacitor

The output capacitor (C2) keeps output voltage

small and ensures regulation loop stability. The

output capacitor impedance should be low at

the switching frequency. Ceramic capacitors

with X5R or X7R dielectrics are recommended.

V_OUT× (V_IN? V_OUT

V_IN× ?I_L× f_OSC

)

L =

Where ?I_Lis the inductor ripple current.

Choose inductor current to be approximately

30% of the maximum load current, 3A. The

maximum inductor peak current is:

?I_L

I_L(MAX)= I_LOAD

Under light load conditions below 100mA, larger

inductance is recommended for improved efficiency.

MP2377 Rev. 0.92

4/19/2011

www.MonolithicPower.com

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

MP2377 – 3A, 21V, 600KHz STEP-DOWN CONVERTER

PCB Layout Guide

PCB layout is very important to achieve stable

operation. Please follow these guidelines and

take Figure3 and 4 for references.

1) Keep the path of switching current short

and minimize the loop area formed by Input

cap, high-side MOSFET and schottky diode.

2) Keep the connection of schottky diode

between SW pin and input power ground

as short and wide as possible.

3) Ensure all feedback connections are short

and direct. Place the feedback resistors

and compensation components as close to

the chip as possible.

4) Route SW away from sensitive analog

areas such as FB.

Top Layer

5) Connect IN, SW, and especially GND

respectively to a large copper area to cool

the chip to improve thermal performance

and long-term reliability. For single layer

PCB, exposed pad should not be soldered.

Bottom Layer

Figure 4—PCB Layout for Double Layers

Figure 3—PCB Layout for Single Layer

MP2377 Rev. 0.92

4/19/2011

www.MonolithicPower.com

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

MP2377 – 3A, 21V, 600KHz STEP-DOWN CONVERTER

External BST Diode

IN4148

External Bootstrap Diode

BST

An external bootstrap diode may enhance the

efficiency of the regulator, the applicable

conditions of external BST diode are:

C_BST

MP2377

5V or 3.3V

V_OUT=5V or 3.3V; and

C_OUT

V_OUT

V_IN

Duty cycle is high: D=

>65%

Figure 5—Add Optional External Bootstrap

Diode to Enhance Efficiency

In these cases, an external BST diode is

recommended from the output of the voltage

regulator to BST pin, as shown in Fig.5

The recommended external BST diode is

IN4148, and the BST cap is 0.1~1μF.

By using this circuit, 5V input voltage can output

3.3V and 2.5V with just 30mA load.

MP2377 Rev. 0.92

4/19/2011

www.MonolithicPower.com

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

MP2377 – 3A, 21V, 600KHz STEP-DOWN CONVERTER

PACKAGE INFORMATION

SOIC8E (EXPOSED PAD)

0.189(4.80)

0.197(5.00)

0.124(3.15)

0.136(3.45)

0.150(3.80)

0.157(4.00)

0.228(5.80)

0.244(6.20)

0.089(2.26)

0.101(2.56)

PIN 1 ID

TOP VIEW

BOTTOM VIEW

SEE DETAIL "A"

0.051(1.30)

0.067(1.70)

SEATING PLANE

0.000(0.00)

0.006(0.15)

0.0075(0.19)

0.0098(0.25)

0.013(0.33)

0.020(0.51)

SIDE VIEW

0.050(1.27)

BSC

FRONT VIEW

0.010(0.25)

0.020(0.50)

x 45^o

GAUGE PLANE

0.010(0.25) BSC

0.050(1.27)

0.024(0.61)

0.063(1.60)

0.016(0.41)

0.050(1.27)

0^o-8^o

DETAIL "A"

0.103(2.62)

0.213(5.40)

NOTE:

1) CONTROL DIMENSION IS IN INCHES. DIMENSION IN

BRACKET IS IN MILLIMETERS.

2) PACKAGE LENGTH DOES NOT INCLUDE MOLD FLASH,

PROTRUSIONS OR GATE BURRS.

3) PACKAGE WIDTH DOES NOT INCLUDE INTERLEAD FLASH

OR PROTRUSIONS.

0.138(3.51)

4) LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING)

SHALL BE 0.004" INCHES MAX.

5) DRAWING CONFORMS TO JEDEC MS-012, VARIATION BA.

6) DRAWING IS NOT TO SCALE.

RECOMMENDED LAND PATTERN

MP2377 Rev. 0.92

4/19/2011

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MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

MP2374DS-LF-Z相關文章

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MP2377DN產(chǎn)品參數(shù)

型號:	MP2377DN
是否無鉛：	含鉛
是否Rohs認證：	不符合
生命周期：	Not Recommended
IHS 制造商：	MONOLITHIC POWER SYSTEMS INC
零件包裝代碼：	SOIC
包裝說明：	HLSOP,
針數(shù)：	8
Reach Compliance Code：	compliant
ECCN代碼：	EAR99
HTS代碼：	8542.39.00.01
風險等級：	5.19
模擬集成電路 - 其他類型：	SWITCHING REGULATOR
控制模式：	CURRENT-MODE
控制技術：	PULSE WIDTH MODULATION
最大輸入電壓：	21 V
最小輸入電壓：	4.5 V
標稱輸入電壓：	12 V
JESD-30 代碼：	R-PDSO-G8
長度：	4.9 mm
功能數(shù)量：	1
端子數(shù)量：	8
最高工作溫度：	85 °C
最低工作溫度：	-40 °C
標稱輸出電壓：	3.3 V
封裝主體材料：	PLASTIC/EPOXY
封裝代碼：	HLSOP
封裝形狀：	RECTANGULAR
封裝形式：	SMALL OUTLINE
峰值回流溫度（攝氏度）：	NOT SPECIFIED
認證狀態(tài)：	Not Qualified
座面最大高度：	1.7 mm
表面貼裝：	YES
切換器配置：	BUCK
最大切換頻率：	1500 kHz
溫度等級：	INDUSTRIAL
端子形式：	GULL WING
端子節(jié)距：	1.27 mm
端子位置：	DUAL
處于峰值回流溫度下的最長時間：	NOT SPECIFIED
寬度：	3.9 mm
Base Number Matches：	1

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