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參數資料
| 型號： | MAX868 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Regulated, Adjustable -2x Inverting Charge Pump |
| 中文描述： | 穩壓型、可調節、-2倍壓反相電荷泵 |
| 文件頁數： | 1/12頁 |
| 文件大?。?/td> | 152K |
| 代理商： | MAX868 |
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
General Desc ription
The MAX868 inverting charge pump provides a low-cost
and compact means of generating a regulated negative
voltage up to -2 x V
IN
from a positive input voltage
between 1.8V and 5.5V. It uses a pulse-frequency-
modulation (PFM) control scheme to generate the regulat-
ed negative output voltage. PFM operation is obtained
by gating the internal 450kHz oscillator on and off as
needed to maintain output voltage regulation. This
unique on-demand switching scheme gives the MAX868
excellent light-load efficiency without degrading its full-
load operation (up to 30mA), permitting smaller capaci-
tors to take advantage of the oscillator’s high switching
frequency.
The MAX868 requires no inductors; only four capacitors
are required to build a complete DC-DC converter.
Output voltage regulation is achieved by adding just two
resistors. The MAX868 comes in a 10-pin μMAX pack-
age, which is only 1.11mm high and occupies just half
the board area of a standard 8-pin SO.
________________________Applic ations
Small LCD Panels
Cell Phones
Cordless Phones
Camcorders
Handy-Terminals, PDAs
Medical Instruments
Battery-Operated Equipment
____________________________Features
o
Regulated Negative Output Voltage
(up to -2 x V
IN
)
o
Ultra-Small, 10-Pin μMAX Package
o
On-Demand Switching at up to 450kHz
o
30μA Quiescent Supply Current
o
Requires Only Four Small External Capacitors
o
1.8V to 5.5V Input Voltage Range
o
0.1μA Logic-Controlled Shutdown
o
Up to 30mA Output Current
M
Regulated, Adjustable -2x
Inverting Charge Pump
________________________________________________________________ Maxim Integrated Products
1
1
2
3
4
5
10
9
8
7
6
FB
SHDN
C2+
IN
PGND
C1-
OUT
GND
MAX868
μ
MAX
TOP VIEW
C2-
C1+
Configuration
MAX868
C1+
IN
PGND
SHDN
GND
FB
OUT
0.1
μ
F
1
μ
F
2.2
μ
F
V
OUT
= 0V TO-2 x V
IN
V
IN
= 1.8V TO5.5V
0.1
μ
F
C1-
C2+
C2-
Typic al Operating Circ uit
19-1290; Rev 1; 2/98
PART
MAX868C/D
MAX868EUB
*Dice are tested at T
A
= +25°C.
-40°C to +85°C
0°C to +70°C
TEMP. RANGE
PIN-PACKAGE
Dice*
10 μMAX
Ordering Information
相關PDF資料 |
PDF描述 |
|---|---|
| MAX868EUB | Regulated, Adjustable -2x Inverting Charge Pump |
| MAX869LEEE | 2A, Current-Limited, High-Side P-Channel Switch with Thermal Shutdown |
| MAX869 | 2A, Current-Limited, High-Side P-Channel Switch with Thermal Shutdown |
| MAX869L | 2A, Current-Limited, High-Side P-Channel Switch with Thermal Shutdown |
| MAX892L | 2A, Current-Limited, High-Side P-Channel Switch with Thermal Shutdown |
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