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MAX1977

更新时间： 2024-11-12 22:57:59

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
High-Efficiency, Quad Output, Main Power- Supply Controllers for Notebook Computers

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MAX1977 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MAX1977相关器件

型号	品牌	获取价格	描述	数据表
MAX19777	MAXIM	获取价格	3Msps, Low-Power, Serial 12-Bit ADC
MAX19777	ADI	获取价格	3Msps、低功耗、串行、12位ADC
MAX19777AZA+	MAXIM	获取价格	3Msps, Low-Power, Serial 12-Bit ADC
MAX19777AZA+T	MAXIM	获取价格	3Msps, Low-Power, Serial 12-Bit ADC
MAX19777EVKIT	MAXIM	获取价格	Time Domain, Frequency Domain, and Histogram Plotting in the EV Kit Software
MAX1977EEI	MAXIM	获取价格	High-Efficiency, Quad Output, Main Power- Supply Controllers for Notebook Computers
MAX1977EEI+	MAXIM	获取价格	Dual Switching Controller, Current-mode, 500kHz Switching Freq-Max, BICMOS, PDSO28, 0.150
MAX1977EEI+T	MAXIM	获取价格	Dual Switching Controller, Current-mode, 500kHz Switching Freq-Max, BICMOS, PDSO28, 0.150
MAX1977EEI-T	MAXIM	获取价格	Dual Switching Controller, Current-mode, 500kHz Switching Freq-Max, BICMOS, PDSO28, 0.150
MAX1978	MAXIM	获取价格	Integrated Temperature Controllers for Peltier Modules

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