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| 型号： | MAX887HESA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 1/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 0.6A 8SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.25 V ~ 10 V |
| 输入电压： | 3.5 V ~ 11 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 300kHz |
| 电流 - 输出： | 600mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-SOIC |
19-1142 Rev 0; 9/96
UATION
AVAILA
EVAL
KIT MA
BLE
NUAL
100% Duty Cycle, Low-Noise,
Step-Down, PWM DC-DC Converter
_______________General Description
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.
________________________Applications
____________________________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
______________Ordering Information
Portable Instruments
Cellular Phones and Radios
Personal Communicators
PART
MAX887HC/D
MAX887HESA
TEMP. RANGE
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
Dice*
8 SO
Distributed Power Systems
Computer Peripherals
__________Typical Operating Circuit
* Contact factory for availability. Dice are tested at T A = +25°C.
__________________Pin Configuration
V IN = 3.5V to 11V
V+
LX
33 μ H
V OUT = 3.3V
TOP VIEW
47 μ F
OFF
ON
0.33 μ F
MAX887
SHDN
R1
165k ?
C1
100pF
47 μ F
SHDN 1
FB 2
MAX887
8
7
V+
LX
SYNC
FB
REF 3
6
SYNC
VL
2.2 μ F
REF
0.047 μ F
GND
R2
100k ?
VL 4
SO
5
GND
V OUT = 1.25V (R1/R2 + 1)
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
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