Datasheet > MAX8500

MAX8500

更新时间： 2024-11-17 22:55:11

品牌	Logo	应用领域
美信 - MAXIM		转换器手机
页数	文件大小	规格书
14页	298K
描述
PWM Buck Converters with Bypass FET for N-CDMA/W-CDMA Handsets

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中文翻译

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数据手册

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MAX8500 数据手册

19-2641; Rev 0; 10/02

P WM Bu c k Co n ve rt e rs w it h Byp a s s FET

fo r N-CDMA/W-CDMA Ha n d s e t s

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

Fe a t u re s

The MAX8500–MAX8504 PWM DC-to-DC buck converters

are optimized with integrated bypass FET (0.25Ω typ)

to provide power to the PA in N-CDMA and W-CDMA

cell phones. The devices have a low on-resistance FET

to bypass the external inductor for low dropout of only

150mV at 600mA load, regardless of inductor series

resistance. The supply voltage range is from 2.6V to

5.5V and the guaranteed converter output current is

600mA. The 1MHz PWM switching frequency allows for

small external components.

♦ Integrated Bypass PFET

♦ 150mV Dropout at 600mA Load (Regardless of

External Inductor)

♦ Dynamically Adjustable Output from 0.4V to

BATT

♦ Externally Fixed Output from 1.25V to 2.5V with

Digitally Controlled High-Power Bypass Mode

(MAX8504)

The MAX8500–MAX8503 are dynamically controlled to

♦ 1MHz Fixed-Frequency PWM Switching

♦ 600mA Guaranteed Output Current

♦ 10% to 100% Duty-Cycle Operation

provide varying output voltages from 0.4V to V

BATT

The LDO regulation point is slightly lower than the PWM

converter such that the transition into and out of dropout

is smooth, regardless of the inductor resistance. The

MAX8504 is programmed for fixed 1.25V to 2.5V output

with external resistors. It features a high-power bypass

mode that connects the output directly to the battery. All

devices are designed to achieve an output settling time

of less than 30µs for a full-scale change in output volt-

age and load current.

♦ Low Quiescent Current

280µA (typ) in Normal Mode

3.3mA (typ) in PWM Mode

0.1µA (typ) in Shutdown Mode

♦ 12-Pin Thin QFN (4mm x 4mm, 0.8mm max Height)

The MAX8500–MAX8504 are available in a 12-lead

4mm x 4mm thin QFN package (0.8mm max height).

Ord e rin g In fo rm a t io n

PIN-

PACKAGE

TOP

MARK

Ap p lic a t io n s

PART

TEMP RANGE

N-CDMA/W-CDMA Cellular Phones

Wireless PDAs and Modems

MAX8500ETC

MAX8501ETC*

MAX8502ETC*

MAX8503ETC

MAX8504ETC

-40°C to +85°C

12 Thin QFN

AABQ

—

AABU

AABS

Typ ic a l Op e ra t in g Circ u it

*Future product—contact factory for availability.

4.7µH

INPUT 2.6V TO 5.5V

OUTPUT 0.4V TO V

BATT

P in Co n fig u ra t io n

10µF

4.7µF

BATT

OUT

SHDN SKIP

OUT

SKIP

SHDN

REF

LDO

REFIN

PWM

DAC

1MHz

OSC

GND

REF

BATT

BATTP

MAX8500–

MAX8504

REFIN

(FB)

MAX8500-

MAX8503

PGND

GND

COMP

COMP BATT PGND

(HP)

8.2kΩ

Thin QFN 4mm x 4mm

1000pF

( ) MAX8504 ONLY

________________________________________________________________ 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...14

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与MAX8500相关器件

型号	品牌	获取价格	描述	数据表
MAX8500ETC	MAXIM	获取价格	PWM Buck Converters with Bypass FET for N-CDMA/W-CDMA Handsets
MAX8500ETC+	MAXIM	获取价格	Switching Regulator, Current-mode, 2.25A, 1000kHz Switching Freq-Max, BICMOS, CQCC12, 4 X
MAX8500ETC-T	MAXIM	获取价格	Switching Regulator, Current-mode, 2.25A, 1000kHz Switching Freq-Max, BICMOS, CQCC12, 4 X
MAX8501	MAXIM	获取价格	PWM Buck Converters with Bypass FET for N-CDMA/W-CDMA Handsets
MAX8501ETC	MAXIM	获取价格	PWM Buck Converters with Bypass FET for N-CDMA/W-CDMA Handsets
MAX8501ETC+	MAXIM	获取价格	Switching Regulator, Current-mode, 2.25A, 1000kHz Switching Freq-Max, BICMOS, CQCC12, 4 X
MAX8501ETC-T	MAXIM	获取价格	Switching Regulator, Current-mode, 2.25A, 1000kHz Switching Freq-Max, BICMOS, CQCC12, 4 X
MAX8502	MAXIM	获取价格	PWM Buck Converters with Bypass FET for N-CDMA/W-CDMA Handsets
MAX8502ETC	MAXIM	获取价格	PWM Buck Converters with Bypass FET for N-CDMA/W-CDMA Handsets
MAX8502ETC+	MAXIM	获取价格	Switching Regulator, Current-mode, 2.25A, 1000kHz Switching Freq-Max, BICMOS, CQCC12, 4 X

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