參數資料
型號： MAX1927-MAX1928
廠商： Maxim Integrated Products, Inc.
元件分類： DC/DC變換器
英文描述： Low-Output-Voltage, 800mA, PWM Step-Down DC-DC Converters
中文描述： 低輸出電壓，800mA的PWM升壓型DC - DC轉換器
文件頁數： 1/12頁
文件大?。?/td> 303K
代理商： MAX1927-MAX1928
General Description
The MAX1927/MAX1928 800mA step-down converters
power low-voltage microprocessors in compact equip-
ment requiring the highest possible efficiency. The
MAX1927/MAX1928 are optimized for generating low
output voltages (down to 750mV) at high efficiency
using small external components. The supply voltage
range is from 2.6V to 5.5V and the guaranteed minimum
output current is 800mA. 1MHz pulse-width modulation
(PWM) switching allows for small external components.
A unique control scheme minimizes ripple at light loads,
while maintaining a low 140μA quiescent current.
The MAX1927/MAX1928 include a low on-resistance
internal MOSFET switch and synchronous rectifier to
maximize efficiency and minimize external component
count. No external diode is needed. 100% duty-cycle
operation allows for a dropout voltage of only 340mV at
800mA. Other features include internal soft-start,
power-OK (POK) output, and selectable forced PWM
operation for lower noise at all load currents.
The MAX1928 is available with several preset output
voltages: 1.5V (MAX1928-15), 1.8V (MAX1928-18), and
2.5V (MAX1928-25). The MAX1927R has adjustable
output range down to 0.75V. The MAX1927/MAX1928
are available in a tiny 10-pin μMAX package.
Applications
WCDMA Handsets
PDAs and Palmtops
DSP Core Power
Battery-Powered Equipment
Features
o
800mA Output Current
o
Output Voltages from 0.75V to 5V
o
2.6V to 5.5V Input Voltage Range
o
Power-OK Output
o
No Schottky Diode Required
o
Selectable Forced PWM Operation
o
1MHz Fixed-Frequency PWM Operation
o
140μA Quiescent Current
o
Soft-Start
o
10-Pin μMAX Package
M
Low-Output-Voltage, 800mA, PWM Step-Down
DC-DC Converters
________________________________________________________________
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.
1
Ordering Information
BATT
COMP
GND
REF
PGND
LX
POK
FB
V
2.6V TO 5.5V
C1
C2
C
C
R
C
L1
V
0.75V AT 800mA
SHDN
PWM
MAX1927R
C
f
Typical Operating Circuit
19-2527; Rev 0; 7/02
PART
PRESET
OUTPUT
VOLTAGE
Adj. to 0.75V -40
°
C to +85
°
C 10 μMAX
1.5V
-40
°
C to +85
°
C 10 μMAX
1.8V
-40
°
C to +85
°
C 10 μMAX
2.5V
-40
°
C to +85
°
C 10 μMAX
TEMP
RANGE
PIN-
PACKAGE
MAX1927
REUB
MAX1928
EUB15
MAX1928EUB18
MAX1928EUB25
1
2
3
4
5
10
9
8
7
6
POK
BATT
LX
PGND
FB
REF
GND
PWM
MAX1927R
MAX1928
μ
MAX
TOP VIEW
COMP
SHDN
Pin Configuration
相關PDF資料
PDF描述
MAX1927REUB Low-Output-Voltage, 800mA, PWM Step-Down DC-DC Converters
MAX1928EUB25 Low-Output-Voltage, 800mA, PWM Step-Down DC-DC Converters
MAX1927 Fixed-Point Digital Signal Processor 288-FCBGA
MAX1928EUB15 Low-Output-Voltage, 800mA, PWM Step-Down DC-DC Converters
MAX1928EUB18 Low-Output-Voltage, 800mA, PWM Step-Down DC-DC Converters
相關代理商/技術參數
參數描述
MAX1927REUB 功能描述:直流/直流開關轉換器 800mA PWM Step-Down DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT
MAX1927REUB+ 功能描述:直流/直流開關轉換器 800mA PWM Step-Down DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT
MAX1927REUB+T 功能描述:直流/直流開關轉換器 800mA PWM Step-Down DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT
MAX1927REUB-G05 功能描述:直流/直流開關轉換器 800mA PWM Step-Down DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT
MAX1927REUB-T 功能描述:直流/直流開關轉換器 800mA PWM Step-Down DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT
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