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參數資料
| 型號： | MAX887 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | DC/DC變換器 |
| 英文描述： | 100% Duty Cycle, Low-Noise, Step-Down, PWM DC-DC Converter |
| 中文描述： | 100%占空比、低噪聲、降壓型、PWM DC-DC轉換器 |
| 文件頁數： | 1/12頁 |
| 文件大小： | 146K |
| 代理商： | MAX887 |
_______________General Desc ription
The MAX887 high-efficiency, step-down DC-DC con-
verter provides an adjustable output from 1.25V to
10.5V. It accepts inputs from 3.5V to 11V and delivers
600mA. Operation to 100% duty cycle minimizes
dropout voltage (300mV typ at 500mA). Synchronous
rectification reduces output rectifier losses, resulting in
efficiency as high as 95%.
Fixed-frequency pulse-width modulation (PWM)
reduces noise in sensitive communications applica-
tions. Using a high-frequency internal oscillator allows
tiny surface-mount components to reduce PC board
area, and eliminates audio-frequency interference. A
SYNC input allows synchronization to an external clock
to avoid interference with sensitive RF and data-
acquisition circuits.
The MAX887 features current-mode operation for supe-
rior load/line-transient response. Cycle-by-cycle current
limiting protects the internal MOSFET and rectifier. A
low-current (2.5μA typ) shutdown mode conserves bat-
tery life.
________________________Applic ations
Portable Instruments
Cellular Phones and Radios
Personal Communicators
Distributed Power Systems
Computer Peripherals
____________________________Features
o
95% Efficiency
o
600mA Output Current
o
Cycle-by-Cycle Current Limiting
o
Low-Dropout, 100% Duty-Cycle Operation,
300mV at 500mA
o
Internal 0.6
(typ) MOSFET
o
Internal Synchronous Rectifier
o
High-Frequency Current-Mode PWM
o
External SYNC or Internal 300kHz Oscillator
o
Guaranteed 260kHz to 340kHz Internal Oscillator
Frequency Limits
o
2.5μA Shutdown Mode
M
100% Duty Cyc le, Low-Noise,
S tep-Down, PWM DC-DC Converter
________________________________________________________________ Maxim Integrated Products
1
1
2
8
7
V+
LX
SYNC
GND
SHDN
FB
REF
VL
MAX887
SO
TOP VIEW
3
4
6
5
__________________Pin Configuration
MAX887
REF
R1
165k
R2
100k
0.047
μ
F
2.2
μ
F
47
μ
F
47
μ
F
C1
100pF
0.33
μ
F
33
μ
H
V+
LX
FB
GND
SYNC
VL
SHDN
V
OUT
= 3.3V
V
OUT
= 1.25V (R1/R2 + 1)
V
IN
= 3.5V to 11V
ON
OFF
__________Typic al Operating Circ uit
19-1142 Rev 0; 9/96
EVALUAVAILABLE
PART
MAX887HC/D
MAX887HESA
*
Contact factory for availability. Dice are tested at T
A
= +25°C.
-40°C to +85°C
0°C to +70°C
TEMP. RANGE
PIN-PACKAGE
Dice*
8 SO
______________Ordering Information
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MAX8873REUK | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube 制造商:Rochester Electronics LLC 功能描述: |
| MAX8873REUK+T | 功能描述:低壓差穩壓器 - LDO 120mA Linear Regulator RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節:0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| MAX8873REUK-T | 功能描述:低壓差穩壓器 - LDO 120mA Linear Regulator RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節:0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| MAX8873SEUK | 制造商:Maxim Integrated Products 功能描述:- Cut Tape Product 制造商:Rochester Electronics LLC 功能描述: |
| MAX8873SEUK+ | 制造商:Maxim Integrated Products 功能描述:LDO REG 1.25V TO 6.5V/2.84V 0.12A 5PIN SOT-23 - Rail/Tube |
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