MAX887 Maxim, MAX887 Datasheet
MAX887
Manufacturer Part Number
MAX887
Description
100% Duty Cycle / Low-Noise / Step-Down / PWM DC-DC Converter
Manufacturer
Maxim
Datasheet
1.MAX887.pdf
(12 pages)
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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
19-1142 Rev 0; 9/96
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
__________Typical Operating Circuit
_______________General Description
47 F
V
OFF
IN
2.2 F
= 3.5V to 11V
ON
Portable Instruments
Cellular Phones and Radios
Personal Communicators
Distributed Power Systems
Computer Peripherals
0.33 F
0.047 F
V+
REF
SHDN
SYNC
VL
________________________________________________________________ Maxim Integrated Products
MAX887
GND
V
OUT
= 1.25V (R1/R2 + 1)
LX
FB
Step-Down, PWM DC-DC Converter
33 H
100k
165k
R2
R1
C1
100pF
100% Duty Cycle, Low-Noise,
V
OUT
= 3.3V
47 F
*
____________________________Features
Contact factory for availability. Dice are tested at T
______________Ordering Information
MAX887HC/D
MAX887HESA
__________________Pin Configuration
95% Efficiency
600mA Output Current
Cycle-by-Cycle Current Limiting
Low-Dropout, 100% Duty-Cycle Operation,
300mV at 500mA
Internal 0.6Ω (typ) MOSFET
Internal Synchronous Rectifier
High-Frequency Current-Mode PWM
External SYNC or Internal 300kHz Oscillator
Guaranteed 260kHz to 340kHz Internal Oscillator
Frequency Limits
2.5µA Shutdown Mode
TOP VIEW
PART
SHDN
REF
FB
VL
-40°C to +85°C
TEMP. RANGE
1
2
3
4
0°C to +70°C
MAX887
SO
8
7
6
5
Dice*
8 SO
PIN-PACKAGE
V+
LX
SYNC
GND
A
= +25°C.
1
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