lm43601-Cff反馈电容-Cout-L-计算过程资源-CSDN文库

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LM43601 反馈电容 Cout-L 计算过程 LM43601 是一款同步降压 DC-DC 转换器，可以驱动高达 1A 的负载电流，从 3.5V 到 36V 的输入电压范围内工作。 LM43601 提供了出色的效率、输出精度和 dropout 电压，在一个非常小的解决方案尺寸中。 LM43601 的特点包括：低静态电流、高效率、可调整的频率范围、集成同步整流、电压跟踪能力、软启动功能、输出短路保护、过温热关断保护等。 1. 低静态电流：LM43601 在调节状态下的静态电流只有 33μA，这使得它非常适合在低功耗应用中使用。 2. 高效率：LM43601 的效率非常高，尤其是在轻载状态下，使用 Direct Current Mode (DCM) 和 Pulse-Frequency Modulation (PFM) 可以获得高效率。 3. 可调整的频率范围：LM43601 的频率范围可以从 200 kHz 到 2.2 MHz 调整， default 值为 500 kHz。 4. 集成同步整流：LM43601 集成了同步整流电路，能够提高转换效率和减少损耗。 5. 电压跟踪能力：LM43601 具有电压跟踪能力，可以追踪输出电压的变化。 6. 软启动功能：LM43601 具有软启动功能，可以减少启动时的电流冲击。 7. 输出短路保护：LM43601 具有输出短路保护功能，可以在输出短路时自动断开输出。 8. 过温热关断保护：LM43601 具有过温热关断保护功能，可以在温度过高时自动断开输出。 LM43601 的应用领域非常广泛，包括工业电源、电信系统、汽车电子、一般用途的宽电压调节、高效率的点-of-load 调节等。在设计 LM43601 的时，需要考虑 Cout 的计算过程。 Cout 是输出电容的电容值，计算过程可以按照以下步骤进行： 1. 确定输出电压和输出电流的要求。 2. 根据 LM43601 的 datasheet，选择合适的输出电容值。 3. 使用公式计算 Cout 的电容值：Cout = (Iout \* Δt) / (ΔVout \* f) 其中，Iout 是输出电流，Δt 是开关周期，ΔVout 是输出电压的变化，f 是开关频率。在计算 Cout 的过程中，需要考虑到 LM43601 的输出电压、输出电流、开关频率等参数，选择合适的输出电容值，以确保 LM43601 的稳定工作。 LM43601 是一款高效率、低静态电流、可调整频率范围的同步降压 DC-DC 转换器，非常适合在各种应用中使用。

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EN 55022 Class B Limit

Frequency (MHz)

dBuV

Evaluation Board Emissions

1000100

Vertical Polarization

Horizontal Polarization

SWVIN

PGND

CBOOT

VCC

BIAS

SYNC

ENABLE

SS/TRK

AGND

LM43601

OUT

BOOT

VCC

OUT

BIAS

FBT

FBB

PGOOD

Product

Folder

Order

Now

Technical

Documents

Tools &

Software

Support &

Community

Reference

Design

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

LM43601

SNVSA44B –AUGUST 2014–REVISED JANUARY 2018

LM43601 3.5-V to 36-V, 1-A Synchronous Step-Down Voltage Converter

1 Features

• 33-µA Quiescent Current in Regulation

• High Efficiency at Light Load (DCM and PFM)

• Meets EN55022/CISPR 22 EMI Standards

• Integrated Synchronous Rectification

• Adjustable Frequency Range: 200 kHz to 2.2 MHz

(500 kHz default)

• Frequency Synchronization to External Clock

• Internal Compensation

• Stable With Almost Any Combination of Ceramic,

Polymer, Tantalum, and Aluminum Capacitors

• Power-Good Flag

• Soft Start into Pre-Biased Load

• Internal Soft Start: 4.1 ms

• Extendable Soft-Start Time by External Capacitor

• Output Voltage Tracking Capability

• Precision Enable to Program System UVLO

• Output Short-Circuit Protection With Hiccup Mode

• Overtemperature Thermal Shutdown Protection

• Create a Custom Design Using the LM43601 With

the WEBENCH

Power Designer

2 Applications

• Industrial Power Supplies

• Telecommunications Systems

• Sub-AM Band Automotive

• General Purpose Wide V

Regulation

• High Efficiency Point-Of-Load Regulation

3 Description

The LM43601 regulator is an easy to use

synchronous step-down DC-DC converter capable of

driving up to 1 A of load current from an input voltage

ranging from 3.5 V to 36 V (42 V transient). The

LM43601 provides exceptional efficiency, output

accuracy, and dropout voltage in a very small solution

size. An extended family is available in 0.5-A, 2-A

and 3-A load current options in pin-to-pin compatible

packages. Peak-current-mode control is employed to

achieve simple control-loop compensation and cycle-

by-cycle current limiting. Optional features such as

programmable switching frequency, synchronization,

power-good flag, precision enable, internal soft start,

extendable soft start, and tracking provide a flexible

and easy-to-use platform for a wide range of

applications. Discontinuous conduction and automatic

frequency modulation at light loads improve light load

efficiency. The family requires few external

components and pin arrangement allows simple,

optimum PCB layout. Protection features include

thermal shutdown, V

undervoltage lockout, cycle-

by-cycle current limit, and output short-circuit

protection. The LM43601 device is available in the

16-leaded HTSSOP (PWP) package (6.6 mm × 5.1

mm × 1.2 mm) with 0.65-mm lead pitch. This device

is pin-to-pin compatible with LM46000, LM46001,

LM46002, LM43600, LM43602, and LM43603.

Device Information

(1)

PART NUMBER PACKAGE BODY SIZE

LM43601 HTSSOP (16) 6.60 mm × 5.10 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

space

Simplified Schematic

Radiated Emission Graph

= 12 V, V

OUT

= 3.3 V, F

= 500 kHz, I

OUT

= 1 A

LM43601

SNVSA44B –AUGUST 2014–REVISED JANUARY 2018

www.ti.com

Product Folder Links: LM43601

Table of Contents

1 Features.................................................................. 1

2 Applications ........................................................... 1

3 Description ............................................................. 1

4 Revision History..................................................... 2

5 Pin Configuration and Functions......................... 3

6 Specifications......................................................... 4

6.1 Absolute Maximum Ratings ...................................... 4

6.2 ESD Ratings.............................................................. 4

6.3 Recommended Operating Conditions....................... 4

6.4 Thermal Information.................................................. 5

6.5 Electrical Characteristics........................................... 5

6.6 Timing Requirements................................................ 6

6.7 Switching Characteristics.......................................... 7

6.8 Typical Characteristics.............................................. 8

7 Detailed Description............................................ 14

7.1 Overview ................................................................. 14

7.2 Functional Block Diagram ....................................... 14

7.3 Feature Description................................................. 15

7.4 Device Functional Modes........................................ 23

8 Applications and Implementation ...................... 25

8.1 Application Information............................................ 25

8.2 Typical Application .................................................. 25

9 Power Supply Recommendations...................... 43

10 Layout................................................................... 43

10.1 Layout Guidelines ................................................. 43

10.2 Layout Example .................................................... 46

11 Device and Documentation Support ................. 47

11.1 Device Support...................................................... 47

11.2 Receiving Notification of Documentation Updates 47

11.3 Community Resources.......................................... 47

11.4 Trademarks........................................................... 47

11.5 Electrostatic Discharge Caution............................ 47

11.6 Glossary................................................................ 47

12 Mechanical, Packaging, and Orderable

Information ........................................................... 48

4 Revision History

Changes from Revision A (August 2014) to Revision B Page

• Added top navigator icon for TI Design ................................................................................................................................. 1

• Editorial changes to meet writing/editing standards ............................................................................................................... 1

Changes from Original (August 2014) to Revision A Page

• Changed from Preview to Production Data ........................................................................................................................... 1

VIN

PGND

CBOOT

VCC

BIAS

SYNC

PGOOD

SS/TRK

AGND

PGND

VIN

PAD

1 16

LM43601

www.ti.com

SNVSA44B –AUGUST 2014 –REVISED JANUARY 2018

Product Folder Links: LM43601

5 Pin Configuration and Functions

PWP Package

16-Pin HTSSOP

Top View

Pin Functions

I/O DESCRIPTION

NO. NAME

1, 2 SW P

Switching output of the regulator. Internally connected to both power MOSFETs. Connect to

power inductor.

3 CBOOT P

Boot-strap capacitor connection for high-side driver. Connect a high-quality, 470-nF capacitor

from CBOOT to SW.

4 VCC P

Internal bias supply output for bypassing. Connect bypass capacitor from this pin to AGND.

Do not connect external load to this pin. Never short this pin to ground during operation.

5 BIAS P

Optional internal LDO supply input. To improve efficiency, TI recommends typing to V

OUT

when 3.3 V ≤ V

OUT

≤ 28 V, or tie to an external 3.3 V or 5 V rail if available. When used, place

a bypass capacitor (1 to 10 µF) from this pin to ground. Tie to ground when not in use. Do not

float

6 SYNC A

Clock input to synchronize switching action to an external clock. Use proper high speed

termination to prevent ringing. Connect to ground if not used. Do not float.

7 RT A

Connect a resistor R

from this pin to AGND to program switching frequency. Leave floating

for 500 kHz default switching frequency.

8 PGOOD A

Open drain output for power-good flag. Use a 10-kΩ to 100-kΩ pullup resistor to logic rail or

other DC voltage no higher than 12 V.

9 FB A

Feedback sense input pin. Connect to the midpoint of feedback divider to set V

OUT

. Do not

short this pin to ground during operation.

10 AGND G

Analog ground pin. Ground reference for internal references and logic. Connect to system

ground.

11 SS/TRK A

Soft-start control pin. Leave floating for internal soft-start slew rate. Connect to a capacitor to

extend soft-start time. Connect to external voltage ramp for tracking.

12 EN A

Enable input to the LM43601: High = ON and low = OFF. Connect to VIN, or to VIN through

resistor divider, or to an external voltage or logic source. Do not float.

13,14 VIN P

Supply input pins to internal LDO and high side power FET. Connect to power supply and

bypass capacitors C

. Path from VIN pin to high frequency bypass C

and PGND must be as

short as possible.

15,16 PGND G

Power ground pins, connected internally to the low-side power FET. Connect to system

ground, PAD, AGND, ground pins of C

and C

OUT

. Path to C

must be as short as possible.

PAD G

Low impedance connection to AGND. Connect to PGND on PCB . Major heat dissipation path

of the die. Must be used for heat sinking to ground plane on PCB.

LM43601

SNVSA44B –AUGUST 2014 –REVISED JANUARY 2018

www.ti.com

Product Folder Links: LM43601

(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings

only, and functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating

Conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

6 Specifications

6.1 Absolute Maximum Ratings

Over operating free-air temperature range (unless otherwise noted)

(1)

PARAMETER MIN MAX UNIT

Input voltages

VIN to PGND –0.3 42

EN to PGND –0.3 V

+ 0.3

FB, RT, SS/TRK to AGND –0.3 3.6

PGOOD to AGND –0.3 15

SYNC to AGND –0.3 5.5

BIAS to AGND –0.3 30

AGND to PGND –0.3 0.3

Output voltages

SW to PGND –0.3 V

+ 0.3

SW to PGND less than 10-ns transients –3.5 42

CBOOT to SW –0.3 5.5

VCC to AGND –0.3 3.6

Storage temperature, T

stg

–65 150 °C

(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.

(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.

6.2 ESD Ratings

VALUE UNIT

(ESD)

Electrostatic discharge

Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001

(1)

±2000

Charged-device model (CDM), per JEDEC specification JESD22-C101

(2)

±500

(1) Recommended Operating Ratings indicate conditions for which the device is intended to be functional, but do not ensure specific

performance limits. For ensured specifications, see Electrical Characteristics.

(2) Whichever is lower Electrical Characteristics.

6.3 Recommended Operating Conditions

(1)

Over operating free-air temperature range (unless otherwise noted)

MIN MAX UNIT

Input voltages

VIN to PGND 3.5 36

EN –0.3 V

FB –0.3 1.1

PGOOD –0.3 12

BIAS input not used –0.3 0.3

BIAS input used 3.3 V

or 28

(2)

AGND to PGND –0.1 0.1

Output voltage V

OUT

1 28 V

Output current I

OUT

0 1 A

Temperature Operating junction temperature range, T

–40 125 °C

LM43601

www.ti.com

SNVSA44B –AUGUST 2014 –REVISED JANUARY 2018

Product Folder Links: LM43601

(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application

report.

(2) The package thermal impedance is calculated in accordance with JESD 51-7 standard with a 4-layer board and 1 W power dissipation.

(3) R

θJA

is highly related to PCB layout and heat sinking. See Figure 107 for measured R

θJA

vs PCB area from a 2-layer board and a 4-

layer board.

6.4 Thermal Information

THERMAL METRIC

(1)(2)

LM43601

UNITPWP (HTSSOP)

16 PINS

θJA

Junction-to-ambient thermal resistance 39.9

(3)

°C/W

θJC(top)

Junction-to-case (top) thermal resistance 26.9 °C/W

θJB

Junction-to-board thermal resistance 21.7 °C/W

Junction-to-top characterization parameter 0.8 °C/W

Junction-to-board characterization parameter 21.5 °C/W

θJC(bot)

Junction-to-case (bottom) thermal resistance 2.3 °C/W

6.5 Electrical Characteristics

Limits apply over the recommended operating junction temperature (T

) range of –40°C to +125°C, unless otherwise stated.

Minimum and Maximum limits are specified through test, design or statistical correlation. Typical values represent the most

likely parametric norm at T

= 25°C, and are provided for reference purposes only. Unless otherwise stated, the following

conditions apply: V

= 12 V, V

OUT

= 3.3 V, F

= 500 kHz.

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

SUPPLY VOLTAGE (VIN PINS)

IN-MIN-ST

Minimum input voltage for startup 3.8 V

SHDN

Shutdown quiescent current V

= 0 V 1.1 3.1 µA

Q-NONSW

Operating quiescent current (non-

switching) from V

= 3.3 V

= 1.5 V

BIAS

= 3.4 V external

6 11 µA

BIAS-NONSW

Operating quiescent current (non-

switching) from external V

BIAS

= 3.3 V

= 1.5 V

BIAS

= 3.4 V external

85 140 µA

Q-SW

Operating quiescent current (switching)

= 3.3 V

OUT

= 0 A

= open

BIAS

= V

OUT

= 3.3 V

FBT

= 1 Meg

33 µA

ENABLE (EN PIN)

EN-VCC-H

Voltage level to enable the internal LDO

output V

ENABLE

high level 1.2 V

EN-VCC-L

Voltage level to disable the internal

LDO output V

ENABLE

low level 0.4 V

EN-VOUT-H

Precision enable level for switching and

regulator output: V

OUT

ENABLE

high level 2 2.1 2.42 V

EN-VOUT-HYS

Hysteresis voltage between V

OUT

precision enable and disable thresholds

ENABLE

hysteresis –305 mV

LKG-EN

Enable input leakage current V

= 3.3 V 0.8 1.75 µA

INTERNAL LDO (VCC PIN AND BIAS PIN)

Internal LDO output voltage V

≥ 3.8 V 3.3 V

CC-UVLO

Undervoltage lockout (UVLO)

thresholds for V

rising threshold 3.14 V

Hysteresis voltage between rising and

falling thresholds

–567 mV

BIAS-ON

Internal LDO input change over

threshold to BIAS

BIAS

rising threshold 2.96 3.2 V

Hysteresis voltage between rising and

falling thresholds

–74 mV

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