MAX849

更新时间： 2024-11-19 22:55:11

品牌	Logo	应用领域
美信 - MAXIM		转换器电池
页数	文件大小	规格书
16页	167K
描述
1-Cell to 3-Cell, High-Power, Low-Noise, Step-Up DC-DC Converters

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MAX849 数据手册

19-1095; Rev 2; 12/97

1 -Ce ll t o 3 -Ce ll, Hig h -P o w e r,

Lo w -No is e , S t e p -Up DC-DC Co n ve rt e rs

/MAX849

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

Fe a t u re s

The MAX848/MAX849 boost converters set a new stan-

dard of high efficiency and high integration for noise-

sensitive power-supply applications, such as portable

phones and small systems with RF data links. The heart

of the these devices is a synchronous boost-topology

regulator that generates a fixed 3.3V output (or 2.7V to

5.5V adjustable output) from one to three NiCd/NiMH

cells or one Li-Ion cell.

♦ Up to 95% Efficiency

(see Typical Output Selector Guide below)

♦ 3.3V Dual Mode™ or 2.7V to 5.5V Adj. Output

♦ 0.7V to 5.5V Input Range

♦ 0.15mW Standby Mode

♦ 300kHz PWM Mode or Synchronizable

♦ Two-Channel ADC with Serial Output

♦ Power-Good Function

Sync hronous re c tific a tion provid e s a 5% e ffic ie nc y

improvement over similar nonsynchronous boost regu-

lators. In standby mode, pulse-skipping PFM operation

keeps the output voltage alive with only 150µW quies-

cent power consumption. Fixed-frequency PWM opera-

tion ensures that the switching noise spectrum is limited

to the 300kHz fundamental and its harmonics, allowing

easy post-filtering noise reduction. For even tighter

noise spectrum control, synchronize to a 200kHz to

400kHz external clock.

Ap p lic a t io n s

PCS Phones

Digital Cordless Phones

Cellular Phones

Hand-Held Instruments

Personal Communicators

Palmtop Computers

Local 3.3V to 5V Supplies

Battery monitoring is provided by a two-channel, volt-

age-to-frequency analog-to-digital converter (ADC).

One channel is intended for a single-cell battery input

(0.625V to 1.875V range), while the other channel is for

monitoring higher voltages (0V to 2.5V range).

Ord e rin g In fo rm a t io n

Two control inputs are provided for push-on, push-off

c ontrol via a mome nta ry p us hb utton s witc h. Up on

power-up, an internal comparator monitors the output

voltage to generate a power-good output (POK).

PART

TEMP. RANGE

-40°C to +85°C

PIN-PACKAGE

16 Narrow SO

MAX848ESE

MAX849ESE

The d e vic e s d iffe r only in the c urre nt limit of the

N-c ha nne l MOSFET p owe r s witc h: 0.8A for the

MAX848, and 1.4A for the MAX849.

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

INPUT

0.8V TO 5.5V

Typ ic a l Ou t p u t S e le c t o r Gu id e

(V)

MAX849 I

(mA)

MAX848 I

(mA)

OUT

MAX848

MAX849

(V)

3.3

A/D CHANNEL 1 IN

A/D CHANNEL 2 IN

A/D CHANNEL SELECT

A/D OUTPUT

AIN1

OUTPUT

100

AIN2

0.9

AINSEL

DATA

ON1

OUT

3.3

300

200

750

500

800

600

1000

110

POUT

1.2

2.4

ON/OFF CONTROL

SYNC INPUT

3.3

200

130

250

150

300

ON2

POK

VOLTAGE MONITOR

OUTPUT

CLK/SEL

POKIN

3.3

2.7

3.6

REF

GND PGND

Pin Configuration appears at end of data sheet.

Dual Mode is a trademark of Maxim Integrated Products.

________________________________________________________________ Maxim Integrated Products

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.

For small orders, phone 408-737-7600 ext. 3468.

12 3 4 5 6 7...16

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与MAX849相关器件

型号	品牌	获取价格	描述	数据表
MAX849C/D	MAXIM	获取价格	Switching Regulator, Voltage-mode, 1A, 300kHz Switching Freq-Max, CMOS, DIE
MAX849C/D-T	MAXIM	获取价格	Switching Regulator, Voltage-mode, 1A, 300kHz Switching Freq-Max, CMOS, DIE
MAX849CSE	MAXIM	获取价格	Analog IC
MAX849ESE	MAXIM	获取价格	1-Cell to 3-Cell, High-Power, Low-Noise, Step-Up DC-DC Converters
MAX849ESE+	MAXIM	获取价格	Switching Regulator, Voltage-mode, 1.4A, 300kHz Switching Freq-Max, CMOS, PDSO16, 0.150 IN
MAX849ESE+T	MAXIM	获取价格	Switching Regulator, Voltage-mode, 1.4A, 300kHz Switching Freq-Max, CMOS, PDSO16, 0.150 IN
MAX849ESE-T	MAXIM	获取价格	Switching Regulator, Current-mode, 1.8A, 340kHz Switching Freq-Max, CMOS, PDSO16, 0.150 IN
MAX849EVKIT	MAXIM	获取价格	Evaluation Kit for the MAX848/MAX849
MAX849LESA	MAXIM	获取价格	Interface IC
MAX850	MAXIM	获取价格	Low-Noise, Regulated, Negative Charge-Pump Power Supplies for GaAsFET Bias

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