MAX868 Maxim, MAX868 Datasheet
MAX868
Manufacturer Part Number
MAX868
Description
Regulated / Adjustable -2x Inverting Charge Pump
Manufacturer
Maxim
Datasheet
1.MAX868.pdf
(12 pages)
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The MAX868 inverting charge pump provides a low-cost
and compact means of generating a regulated negative
voltage up to -2 x V
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.
________________________Applications
19-1290; Rev 1; 2/98
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.
TOP VIEW
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Medical Instruments
Battery-Operated Equipment
PGND
GND
OUT
C1+
C1-
________________________________________________________________ Maxim Integrated Products
1
2
3
4
5
IN
General Description
from a positive input voltage
MAX868
MAX
Configuration
10
9
8
7
6
FB
SHDN
C2+
IN
C2-
Regulated, Adjustable -2x
Inverting Charge Pump
* Dice are tested at T
____________________________Features
MAX868C/D
MAX868EUB
V
Regulated Negative Output Voltage
(up to -2 x V
Ultra-Small, 10-Pin µMAX Package
On-Demand Switching at up to 450kHz
30µA Quiescent Supply Current
Requires Only Four Small External Capacitors
1.8V to 5.5V Input Voltage Range
0.1µA Logic-Controlled Shutdown
Up to 30mA Output Current
IN
= 1.8V TO 5.5V
PART
0.1 F
0.1 F
1 F
IN
Typical Operating Circuit
SHDN
C2+
C2-
C1+
C1-
)
A
= +25°C.
TEMP. RANGE
-40°C to +85°C
0°C to +70°C
MAX868
Ordering Information
PGND
IN
GND
OUT
FB
Dice*
10 µMAX
PIN-PACKAGE
V
OUT
= 0V TO -2 x V
2.2 F
IN
1
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