Datasheet > MAX1959ETP-T

MAX1959ETP-T

更新时间： 2024-11-25 07:55:03

品牌	Logo	应用领域
美信 - MAXIM		信息通信管理
页数	文件大小	规格书
24页	796K
描述
Baseband Circuit, BICMOS, 5 X 5 MM, 0.80 MM HEIGHT, QFN-20

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MAX1959ETP-T 数据手册

19-2659; Rev 0; 10/02

W-CDMA/N-CDMA Cellular Phone HBT PA

Management ICs

General Description

Features

The MAX1958/MAX1959 power amplifier (PA) power-

management ICs (PMICs) integrate an 800mA, dynami-

cally adjustable step-down converter, a 5mA Rail-to-

Rail^®operational amplifier (op amp), and a precision

temperature sensor to power a heterojunction bipolar

transistor (HBT) PA in W-CDMA and N-CDMA cell

phones.

ꢀ Step-Down Converter

Dynamically Adjustable Output Voltage from

0.75V to 3.4V (MAX1958)

Dynamically Adjustable Output Voltage from

1V to 3.6V (MAX1959)

800mA Guaranteed Output Current

130mV IC Dropout at 600mA Load

Low Quiescent Current

The high-efficiency, pulse-width modulated (PWM), DC-

to-DC buck converter is optimized to provide a guaran-

teed output current of 800mA. The output voltage is

dynamically controlled to produce any fixed-output volt-

age in the range of 0.75V to 3.4V (MAX1958) or 1V to

3.6V (MAX1959), with settling time less than 30µs for a

full-scale change in voltage and current. The 1MHz PWM

switching frequency allows the use of small external

components while pulse-skip mode reduces quiescent

current to 190µA with light loads. The converter utilizes a

low on-resistance internal MOSFET switch and synchro-

nous rectifier to maximize efficiency and minimize

external component count. The 100% duty-cycle opera-

tion allows for an IC dropout voltage of only 130mV (typ)

at 600mA load.

190µA (typ) in Skip Mode (MAX1958)

3mA (typ) in PWM Mode

0.1µA (typ) in Shutdown Mode

1MHz Fixed-Frequency PWM operation

16% to 100% Duty-Cycle Operation

No External Schottky Diode Required

Soft-Start

ꢀ Operational Amplifier

5mA Rail-to-Rail Output

Active Discharge in Shutdown

800kHz Gain-Bandwidth Product

120dB Open-Loop Voltage Gain (R = 100kΩ)

ꢀ Temperature Sensor

Accurate Sensor -11.7mV/°C Slope

-40°C to +125°C-Rated Temperature Range

The micropower op amp is used to provide bias to the

HBT PA to maximize efficiency. The amplifier features

active discharge in shutdown for full PA bias control. It

has 5mA rail-to-rail drive capability, 800kHz gain-band-

width product, and 120dB open-loop voltage gain.

ꢀ 20-Pin Thin QFN (5mm ✕ 5mm), 0.8mm Height (max)

Ordering Information

The precision temperature sensor measures tempera-

tures between -40°C to +125°C, with linear tempera-

ture-to-voltage analog output characteristics.

PART

TEMP RANGE

-40°C to +85°C

PIN-PACKAGE

20 Thin QFN-EP*

20 Thin QFN-EP

MAX1958ETP

MAX1959ETP

The MAX1958/MAX1959 are available in a 20-pin 5mm ✕

5mm thin QFN package (0.8mm max height).

*EP = Exposed paddle.

Pin Configuration

TOP VIEW

Applications

W-CDMA and N-CDMA Cellular Phones

AOUT

SHDN2

AGND

TOUT

REF

15 PWM

14 INP

13 IN

Wireless PDAs and Modems

MAX1958/

MAX1959

PGND

Typical Operating Circuit and Functional Diagram appear at

end of data sheet.

THIN QFN

5mm x 5mm

Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.

________________________________________________________________ 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...24

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MAX1959ETP-T 替代型号

型号	品牌	替代类型	描述	数据表
MAX1959ETP+	MAXIM	功能相似	Baseband Circuit, BICMOS, 5 X 5 MM, 0.80 MM HEIGHT, QFN-20

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