參數(shù)資料
型號(hào)： MAX1765
廠商： Maxim Integrated Products, Inc.
元件分類： 數(shù)字信號(hào)處理
英文描述： Replaced by TMS320C6410 : Digital Signal Processors 68-PLCC -40 to 85
中文描述： 800mA、低噪聲、升壓型DC-DC轉(zhuǎn)換器，帶有500mA線性穩(wěn)壓器
文件頁(yè)數(shù)： 1/19頁(yè)
文件大小： 559K
代理商： MAX1765
General Description
The MAX1765 is a high-efficiency, low-noise, step-up
DC-DC converter intended for use in battery-powered
wireless applications. This device operates at a high
1MHz fixed frequency while maintaining an exception-
ally low quiescent supply current (200μA). Its small
external components and tiny package make this
device an excellent choice for small hand-held applica-
tions that require the longest possible battery life.
The MAX1765 uses a synchronous-rectified pulse-
width-modulation (PWM) boost topology to generate
2.5V to 5.5V outputs from a wide range of input
sources, such as one to three alkaline or NiCd/NiMH
cells or a single lithium-ion (Li+) cell. Maxim's propri-
etary architecture significantly improves efficiency at
low load currents while automatically transitioning to
fixed-frequency PWM operation at medium to high load
currents to maintain excellent full-load efficiency.
Forced-PWM mode is available for applications that
require constant-frequency operation at all load cur-
rents, and the MAX1765 may also be synchronized to
an external clock to protect sensitive frequency bands
in communications equipment.
The MAX1765’s low-dropout (LDO) linear regulator and
DC-DC converter have separate shutdown control. The
linear regulator's 250m
pass device maintains excel-
lent dropout voltage at currents up to 500mA. The
MAX1765 also features analog soft-start and current-
limit functions to permit optimization of efficiency, exter-
nal component size, and output voltage ripple.
The MAX1765 comes in a 16-pin QSOP package and a
thermally enhanced 16-pin TSSOP-EP.
____________________________Features
o
High-Efficiency Step-Up Converter
Up to 93% Efficiency
Adjustable Output from +2.5V to +5.5V
Up to 800mA Output
PWM Synchronous-Rectified Topology
1MHz Operating Frequency (or Sync)
o
LDO Linear Regulator
500mA LDO Linear Regulator
2.85V Linear Regulator Output or Adjustable
(1.25V to 5V)
Low 125mV Dropout at 500mA
o
+0.7V to +5.5V Input Range
o
0.1μA Logic-Controlled Shutdown
o
Adjustable Inductor Current Limit and Soft-Start
o
Thermal Shutdown
o
1.5W, 16-Pin TSSOP-EP Package Available
M
800mA, Low-Noise, Step-Up DC-DC Converter
with 500mA Linear Regulator
________________________________________________________________
Maxim Integrated Products
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1
19-1805; Rev 0; 12/00
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
FBL
ONL
TRACK
INL
POUT
LX
PGND
OUTL
TOP VIEW
MAX1765
QSOP/TSSOP-EP
ONB
ISET
REF
OUT
GND
FB
ONA
CLK/SEL
Pin Configuration
Wireless Handsets
PCS Phones
Palmtop Computers
Personal
Communicators
Hand-Held Instruments
Portable Audio Players
Applications
FBL
REF
ILIM
ONL
ONA
POUT
INL
(0.7V TO 5.5V)
3.3
μ
H
OUTL = 2.85V
(ADJ 1.25V
TO 5V)
OUT = 3.3V
OUT
OUTL
PGND
FB
GND
TRACK
LX
CLK/SEL
ONB
MAX1765
Typical Operating Circuit
Ordering Information
TEMP. RANGE
-40
°
C to +85
°
C
-40
°
C to +85
°
C
*Exposed pad
PART
PIN-PACKAGE
16 QSOP
16 TSSOP-EP*
MAX1765EEE
MAX1765EUE
相關(guān)PDF資料
PDF描述
MAX1765EEE 800mA, Low-Noise, Step-Up DC-DC Converter with 500mA Linear Regulator
MAX1765EUE 800mA, Low-Noise, Step-Up DC-DC Converter with 500mA Linear Regulator
MAX1812 Dual USB Switch with Fault Blanking
MAX1812EUB Dual USB Switch with Fault Blanking
MAX1817 Replaced by TMS320VC5506 : Digital Signal Processors 132-BQFP
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX1765EEE 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 800mA Step-Up w/500mA Linear Reg RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
MAX1765EEE+ 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 800mA Step-Up w/500mA Linear Reg RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
MAX1765EEE+T 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 800mA Step-Up w/500mA Linear Reg RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
MAX1765EEE-T 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 800mA Step-Up w/500mA Linear Reg RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
MAX1765EUE 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 800mA Step-Up w/500mA Linear Reg RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
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