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MAX868 Datasheet

Regulated / Adjustable -2x Inverting Charge Pump

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19-1290; Rev 1; 2/98
Regulated, Adjustable -2x
Inverting Charge Pump
General Description
The MAX868 inverting charge pump provides a low-cost
and compact means of generating a regulated negative
voltage up to -2 x VIN 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.
________________________Applications
Small LCD Panels
Cell Phones
Cordless Phones
Camcorders
Handy-Terminals, PDAs
Medical Instruments
Battery-Operated Equipment
Configuration
TOP VIEW
____________________________Features
o Regulated Negative Output Voltage
(up to -2 x VIN)
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
Ordering Information
PART
TEMP. RANGE
MAX868C/D
0°C to +70°C
MAX868EUB
-40°C to +85°C
*Dice are tested at TA = +25°C.
PIN-PACKAGE
Dice*
10 µMAX
Typical Operating Circuit
VIN = 1.8V TO 5.5V
1µF
SHDN IN
GND 1
OUT 2
C1- 3
PGND 4
C1+ 5
MAX868
µMAX
10 FB
9 SHDN
8 C2+
7 IN
6 C2-
0.1µF
0.1µF
MAX868
C1+ FB
C1-
C2+ OUT
C2-
PGND GND
VOUT = 0V TO -2 x VIN
2.2µF
________________________________________________________________ Maxim Integrated Products 1
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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX868 Datasheet

Regulated / Adjustable -2x Inverting Charge Pump

No Preview Available !

Regulated, Adjustable -2x
Inverting Charge Pump
ABSOLUTE MAXIMUM RATINGS
IN to GND .................................................................-0.3V to +6V
OUT to GND ...........................................................+0.3V to -12V
IN to OUT.................................................................-0.3V to -17V
C1+ to GND ........................................(VIN - 12V) to (VIN + 0.3V)
C1- to GND.............................................................+0.3V to -12V
C2+ to GND ....................................................(VIN + 0.3V) to -6V
C2- to GND...............................................................+0.3V to -6V
SHDN, FB to GND .......................................-0.3V to (VIN + 0.3V)
PGND to GND .......................................................-0.3V to +0.3V
Output Current ....................................................................35mA
Short-Circuit Duration.................................................Continuous
Continuous Power Dissipation (TA = +70°C)
10-pin µMAX (derate 5.6mW/°C above +70°C) ...........444mW
Operating Temperature Range
MAX868EUB ....................................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VIN = +3.3V, SHDN = IN, C1 = C2 = 0.22µF, CIN = 1µF, COUT = 10µF, TA = 0°C to +85°C, unless otherwise noted. Typical values
are at TA = +25°C.)
PARAMETER
Supply-Voltage Range
Supply Current
Shutdown Current
Oscillator Frequency
Closed-Loop Output
Resistance
Open-Loop Output
Resistance
FB Trip Point
Output Current
FB Input Bias Current
SHDN Input Threshold
SHDN Input Bias Current
SYMBOL
VIN
IIN
IIN,SHDN
fOSC
ROUT,CL
ROUT
IOUT
VIL
VIH
CONDITIONS
RL = 3kto GND
No load, VFB = -50mV
FB = IN
No load, SHDN = GND
VFB = 50mV
TA = +25°C
TA = 0°C to +85°C
VOUT = -5V
IOUT = 5mA, FB = IN
TA = +25°C
TA = 0°C to +85°C
SHDN = GND (OUT pulls to GND)
VIN = 1.8V to 5.5V
TA = +25°C
TA = 0°C to +85°C
Closed loop
VIN = 3.3V, VOUT = -5V
VIN = 5V, VOUT = -3.3V
VIN = 1.8V to 5.5V, TA = +25°C
VIN = 1.8V to 5.5V
VIN = 5.5V, SHDN = IN or GND
MIN TYP MAX UNITS
1.8 5.5 V
30 50 µA
5 mA
0.1 1 µA
293 450 607
kHz
270 630
0.2
70 100
125
15 50
-30 30 mV
-40 40 mV
12
mA
30
-50 1
50 nA
0.3VIN
0.7VIN
V
-100 1 100 nA
2 _______________________________________________________________________________________


Part Number MAX868
Description Regulated / Adjustable -2x Inverting Charge Pump
Maker Maxim
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MAX868 Datasheet PDF






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