Datasheet > 电源电路 > 开关式稳压器或控制器> MAX1977EEI-T

MAX1977EEI-T

更新时间： 2024-09-25 13:10:23

品牌	Logo	应用领域
美信 - MAXIM		电脑控制器
页数	文件大小	规格书
32页	498K
描述
Dual Switching Controller, Current-mode, 500kHz Switching Freq-Max, BICMOS, PDSO28, 0.150 INCH, 0.025 INCH PITCH, QSOP-28

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MAX1977EEI-T 技术参数

是否无铅：	含铅	是否Rohs认证：	不符合
生命周期：	Obsolete	零件包装代码：	SOIC
包装说明：	0.150 INCH, 0.025 INCH PITCH, QSOP-28	针数：	28
Reach Compliance Code：	not_compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.22
Is Samacsys：	N	模拟集成电路 - 其他类型：	DUAL SWITCHING CONTROLLER
控制模式：	CURRENT-MODE	控制技术：	PULSE WIDTH MODULATION
最大输入电压：	24 V	最小输入电压：	4.5 V
标称输入电压：	12 V	JESD-30 代码：	R-PDSO-G28
JESD-609代码：	e0	长度：	9.89 mm
湿度敏感等级：	1	功能数量：	1
端子数量：	28	最高工作温度：	85 °C
最低工作温度：	-40 °C	封装主体材料：	PLASTIC/EPOXY
封装代码：	SSOP	封装等效代码：	SSOP28,.25
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE, SHRINK PITCH
峰值回流温度（摄氏度）：	245	认证状态：	Not Qualified
座面最大高度：	1.75 mm	子类别：	Switching Regulator or Controllers
表面贴装：	YES	切换器配置：	PUSH-PULL
最大切换频率：	500 kHz	技术：	BICMOS
温度等级：	INDUSTRIAL	端子面层：	Tin/Lead (Sn85Pb15)
端子形式：	GULL WING	端子节距：	0.635 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	NOT SPECIFIED
宽度：	3.9 mm	Base Number Matches：	1

MAX1977EEI-T 数据手册

19-2187; Rev 1; 9/04

Hig h -Effic ie n c y, Qu a d Ou t p u t , Ma in P o w e r-

S u p p ly Co n t ro lle rs fo r No t e b o o k Co m p u t e rs

Ge n e ra l De s c rip t io n

Fe a t u re s

♦ No Current-Sense Resistor Needed (MAX1999)

The MAX1777/MAX1977/MAX1999 d ua l s te p -d own,

switch-mode power-supply (SMPS) controllers generate

logic-supply voltages in battery-powered systems. The

MAX1777/MAX1977/MAX1999 include two pulse-width

modulation (PWM) controllers, adjustable from 2V to 5.5V

or fixed at 5V and 3.3V. These devices feature two linear

regulators providing 5V and 3.3V always-on outputs.

Each linear regulator provides up to 100mA output cur-

rent with automatic linear regulator bootstrapping to the

main SMPS outputs. The MAX1777/MAX1977/MAX1999

include on-board power-up sequencing, a power-good

(PGOOD) output, digital soft-start, and internal soft-stop

output discharge that prevents negative voltages on shut-

down.

♦ Accurate Current Sense with Current-Sense

Resistor (MAX1777/MAX1977)

♦ 1.5% Output Voltage Accuracy

♦ 3.3V and 5V 100mA Bootstrapped Linear

Regulators

♦ Internal Soft-Start and Soft-Stop Output

Discharge

♦ Quick-PWM with 100ns Load Step Response

♦ 3.3V and 5V Fixed or Adjustable Outputs

(Dual Mode™)

♦ 4.5V to 24V Input Voltage Range

♦ Ultrasonic Pulse-Skipping Mode (25kHz min)

♦ Power-Good (PGOOD) Signal

Maxim’s proprietary Quick-PWM™ quick-response, con-

stant on-time PWM control scheme operates without

sense resistors and provides 100ns response to load

transients while maintaining a relatively constant switch-

ing frequency. The unique ultrasonic pulse-skipping

mode maintains the switching frequency above 25kHz,

which eliminates noise in audio applications. Other fea-

tures include pulse skipping, which maximizes efficiency

in light-load applications, and fixed-frequency PWM

mode, which reduces RF interference in sensitive appli-

cations.

♦ Overvoltage Protection Enable/Disable

Ord e rin g In fo rm a t io n

5V/3V

PIN-

PACKAGE

PART

TEMP RANGE

SWITCHING

FREQUENCY

MAX1777EEI -40°C to +85°C 28 QSOP 200kHz/300kHz

MAX1777EEI+ -40°C to +85°C 28 QSOP 200kHz/300kHz

MAX1977EEI -40°C to +85°C 28 QSOP 400kHz/500kHz

MAX1977EEI+ -40°C to +85°C 28 QSOP 400kHz/500kHz

The MAX1777 features a 200kHz/5V and 300kHz/3.3V

SMPS for highest efficiency, while the MAX1977 features

a 400kHz/5V and 500kHz/3.3V SMPS for “thin and light”

applications. The MAX1999 provides a pin-selectable

switching frequency, allowing either 200kHz/300kHz or

400kHz/500kHz operation of the 5V/3.3V SMPSs, respec-

tively. The MAX1777/MAX1977/MAX1999 are available in

28-pin QSOP packages and operate over the extended

temperature range (-40°C to +85°C). The MAX1777/

MAX1977/MAX1999 are available in lead-free packages.

200kHz/300kHz or

MAX1999EEI -40°C to +85°C 28 QSOP

400kHz/500kHz

200kHz/300kHz or

MAX1999EEI+ -40°C to +85°C 28 QSOP

400kHz/500kHz

+Denotes lead-free package.

P in Co n fig u ra t io n s

TOP VIEW

N.C.

PGOOD

ON3

28 BST3

27 LX3

26 DH3

25 LDO3

24 DL3

23 GND

22 OUT3

21 OUT5

20 V+

Ap p lic a t io n s

Notebook and Subnotebook Computers

PDAs and Mobile Communication Devices

3- and 4-Cell Li+ Battery-Powered Devices

ON5

ILIM3

SHDN

FB3

MAX1999

REF

FB5

PRO 10

ILIM5 11

SKIP 12

TON 13

BST5 14

19 DL5

18 LDO5

Quick-PWM and Dual Mode are trademarks of Maxim

Integrated Products, Inc.

16 DH5

15 LX5

QSOP

Pin Configurations continued at end of data sheet.

________________________________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

12 3 4 5 6 7...32

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与MAX1977EEI-T相关器件

型号	品牌	获取价格	描述	数据表
MAX1978	MAXIM	获取价格	Integrated Temperature Controllers for Peltier Modules
MAX1978	ADI	获取价格	Peltier模块集成温度控制器
MAX1978_10	MAXIM	获取价格	Integrated Temperature Controllers for Peltier Modules
MAX1978ETM	MAXIM	获取价格	Integrated Temperature Controllers for Peltier Modules
MAX1978EVKIT	MAXIM	获取价格	Evaluation Kit for the MAX1978
MAX1978-MAX1979	MAXIM	获取价格	Integrated Temperature Controllers for Peltier Modules
MAX1979	MAXIM	获取价格	Integrated Temperature Controllers for Peltier Modules
MAX1979	ADI	获取价格	Peltier模块集成温度控制器
MAX19790	MAXIM	获取价格	250MHz to 4000MHz Dual, Analog Voltage Variable Attenuator
MAX19790	ADI	获取价格	250MHz至4000MHz、双通道、可变电压模拟衰减器

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