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MAX829 Datasheet

Switched-Capacitor Voltage Inverters

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19-0495; Rev 3; 9/99
Switched-Capacitor Voltage Inverters
General Description
The ultra-small MAX828/MAX829 monolithic, CMOS
charge-pump inverters accept input voltages ranging
from +1.5V to +5.5V. The MAX828 operates at 12kHz,
and the MAX829 operates at 35kHz. Their high efficiency
(greater than 90% over most of the load-current range)
and low operating current (60µA for the MAX828) make
these devices ideal for both battery-powered and board-
level voltage-conversion applications.
The MAX828/MAX829 combine low quiescent current
and high efficiency. Oscillator control circuitry and four
power MOSFET switches are included on-chip.
Applications include generating a -5V supply from a +5V
logic supply to power analog circuitry. Both parts come
in a 5-pin SOT23-5 package and can deliver 25mA with
a voltage drop of 500mV.
For a similar device with logic-controlled shutdown,
refer to the MAX1719/MAX1720/MAX1721. For applica-
tions requiring more power, the MAX860 delivers up to
50mA with a voltage drop of 600mV, in a space-saving
µMAX package.
Applications
Small LCD Panels
Cell Phones
Medical Instruments
Handy-Terminals, PDAs
Battery-Operated Equipment
Features
o 5-Pin SOT23-5 Package
o 95% Voltage Conversion Efficiency
o Inverts Input Supply Voltage
o 60µA Quiescent Current (MAX828)
o +1.5V to +5.5V Input Voltage Range
o Requires Only Two Capacitors
o 25mA Output Current
Ordering Information
PART
MAX828EUK
MAX829EUK
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
5 SOT23-5
5 SOT23-5
SOT
TOP MARK
AABI
AABJ
Typical Operating Circuit
Pin Configuration
5
C1+
2
IN
3
C1-
4
GND
MAX828
MAX829
OUT 1
INPUT
SUPPLY
VOLTAGE
NEGATIVE
OUTPUT
VOLTAGE
NEGATIVE VOLTAGE CONVERTER
TOP VIEW
OUT 1
5 C1+
MAX828
IN 2 MAX829
C1- 3
4 GND
SOT23-5
________________________________________________________________ Maxim Integrated Products 1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX829 Datasheet

Switched-Capacitor Voltage Inverters

No Preview Available !

Switched-Capacitor Voltage Inverters
ABSOLUTE MAXIMUM RATINGS
IN to GND .................................................................+6.0V, -0.3V
OUT to GND .............................................................-6.0V, +0.3V
OUT Output Current ...........................................................50mA
OUT Short-Circuit to GND ............................................Indefinite
Continuous Power Dissipation (TA = +70°C)
SOT23-5 (derate 7.1mW/°C above +70°C)...................571mW
Operating Temperature Range
MAX828EUK/MAX829EUK ...............................-40°C to +85°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10s) .................................+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 = +5V, C1 = C2 = 10µF (MAX828), C1 = C2 = 3.3µF (MAX829), TA = 0°C to +85°C, unless otherwise noted. Typical values
are at TA = +25°C.)
PARAMETER
Supply Current
Minimum Supply Voltage
Maximum Supply Voltage
Oscillator Frequency
Power Efficiency
Voltage Conversion Efficiency
Output Resistance
CONDITIONS
TA = +25°C
MAX828
MAX829
RLOAD = 10k
TA = +25°C
TA = 0°C to + 85°C
RLOAD = 10k
TA = +25°C
MAX828
MAX829
RLOAD = 1k, TA = +25°C
RLOAD =
IOUT = 5mA
TA = +25°C
TA = 0°C to + 85°C
MIN TYP MAX UNITS
60 90
µA
150 260
1.25 1.0
1.5
V
5.5 V
8.4 12 15.6
kHz
24.5 35 45.5
94 %
95 99.9
%
20 50
65
Note 1: Capacitor contribution is approximately 20% of the output impedance [ESR + 1 / (pump frequency x capacitance)].
ELECTRICAL CHARACTERISTICS
(VIN = +5V, C1 = C2 = 10µF (MAX828), C1 = C2 = 3.3µF (MAX829), TA = -40°C to +85°C, unless otherwise noted. Typical values
are at TA = +25°C.) (Note 2)
PARAMETER
Supply Current
Supply Voltage Range
Oscillator Frequency
Output Resistance
MAX828
MAX829
RLOAD = 10k
MAX828
MAX829
IOUT = 5mA
CONDITIONS
MIN TYP MAX UNITS
115
µA
325
1.5 5.5 V
6 20
kHz
19 54.3
65
Note 2: All -40°C to +85°C specifications above are guaranteed by design.
2 _______________________________________________________________________________________


Part Number MAX829
Description Switched-Capacitor Voltage Inverters
Maker Maxim
Total Page 8 Pages
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