(PDF) MAX865 Datasheet PDF | Maxim





MAX865 Datasheet PDF

Part Number MAX865
Description Compact / Dual-Output Charge Pump
Manufacture Maxim
Total Page 8 Pages
PDF Download Download MAX865 Datasheet PDF

Features: Datasheet pdf 19-0472; Rev 1; 7/97 Compact, Dual-Outp ut Charge Pump _______________General D escription The MAX865 is a CMOS charge- pump DC-DC converter in an ultra-small µMAX package. It produces positive and negative outputs from a single positiv e input, and requires only four capacit ors. The charge pump first doubles the input voltage, then inverts the doubled voltage. The input voltage ranges from +1.5V to +6.0V. The internal oscillato r is guaranteed to be between 20kHz and 38kHz, keeping noise above the audio r ange while consuming minimal supply cur rent. A 75Ω output impedance permits useful output currents up to 20mA. The MAX865 comes in a 1.11mm-high, 8-pin µ MAX package that occupies half the boar d area of a standard 8-pin SOIC. For a device with selectable frequencies and logic-controlled shutdown, refer to the MAX864 data sheet. __________________ __________Features o 1.11mm-High µMAX Package o Compact: Circuit Fits in 0.08 in2 o Requires Only Four Capacitors o Dual Outputs (positive and neg.

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MAX865 datasheet
19-0472; Rev 1; 7/97
Compact, Dual-Output Charge Pump
_______________General Description
The MAX865 is a CMOS charge-pump DC-DC convert-
er in an ultra-small µMAX package. It produces positive
and negative outputs from a single positive input, and
requires only four capacitors. The charge pump first
doubles the input voltage, then inverts the doubled volt-
age. The input voltage ranges from +1.5V to +6.0V.
The internal oscillator is guaranteed to be between
20kHz and 38kHz, keeping noise above the audio
range while consuming minimal supply current. A 75
output impedance permits useful output currents up to
20mA.
The MAX865 comes in a 1.11mm-high, 8-pin µMAX
package that occupies half the board area of a stan-
dard 8-pin SOIC. For a device with selectable frequen-
cies and logic-controlled shutdown, refer to the MAX864
data sheet.
________________________Applications
Low-Voltage GaAsFET Bias in Wireless Handsets
VCO and GaAsFET Supplies
Split Supply from 3 Ni Cells or 1 Li+ Cell
Low-Cost Split Supply for Low-Voltage
Data-Acquisition Systems
Split Supply for Analog Circuitry
LCD Panels
__________________Pin Configuration
TOP VIEW
C1- 1
C2+ 2
C2- 3
V- 4
MAX865
µMAX
8 C1+
7 V+
6 IN
5 GND
____________________________Features
o 1.11mm-High µMAX Package
o Compact: Circuit Fits in 0.08in2
o Requires Only Four Capacitors
o Dual Outputs (positive and negative)
o +1.5V to +6.0V Input Voltage
o 20kHz (min) Frequency (above the audio range)
______________Ordering Information
PART
MAX865C/D
MAX865EUA
TEMP. RANGE
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
Dice
8 µMAX
__________Typical Operating Circuit
VIN
(+1.5V to +6.0V)
IN
C1+ MAX865
C1-
V+
C2+
C2-
GND
V-
+2*VIN
-2*VIN
GND
+VIN to ±2VIN CONVERTER
GND
________________________________________________________________ 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.

MAX865 datasheet
Compact, Dual-Output Charge Pump
ABSOLUTE MAXIMUM RATINGS
V+ to GND .................................................................+12V, -0.3V
IN to GND .................................................................+6.2V, -0.3V
V- to GND ..................................................................-12V, +0.3V
V- Output Current .............................................................100mA
V- Short-Circuit to GND ................................................Indefinite
Continuous Power Dissipation (TA = +70°C)
µMAX (derate 4.1mW/°C above +70°C) .......................330mW
Operating Temperature Range
MAX865EUA .....................................................-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 = 5V, C1 = C2 = C3 = C4 = 3.3µF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
Minimum Supply Voltage
Maximum Supply Voltage
Supply Current
Oscillator Frequency
Output Resistance
Power Efficiency
Voltage Conversion Efficiency
CONDITIONS
RLOAD = 10k
RLOAD = 10k
TA = +25°C
TA = -40°C to +85°C (Note 1)
TA = +25°C
TA = -40°C to +85°C (Note 1)
IV+ = 1mA,
IV- = 0mA
TA = +25°C
TA = TMIN to TMAX
V+ = 10V (forced),
IV- = 1mA
TA = +25°C
TA = TMIN to TMAX
IL = 5mA
V+, RL =
V-, RL =
MIN TYP MAX
2.0 1.5
6.0
0.6 1.05
1.15
19.5 24 32.5
18 34
150 200
280
75 100
140
85
95 99
90 98
Note 1: These specifications are guaranteed by design and are not production tested.
UNITS
V
V
mA
kHz
%
%
__________________________________________Typical Operating Characteristics
(Circuit of Figure 1, VIN = 5V, TA = +25°C, unless otherwise noted.)
EFFICIENCY vs. OUTPUT CURRENT
(VIN = 5V)
100
90 V+
80
70 V-
60
50
40
30
20
10
0
0 2 4 6 8 10 12 14 16 18
OUTPUT CURRENT (mA)
EFFICIENCY vs. OUTPUT CURRENT
(VIN = 3.3V)
100
90 V+
80 V-
70
60
50
40
30
20
10
0
012 345 678
OUTPUT CURRENT (mA)
EFFICIENCY vs. OUTPUT CURRENT
(VIN = 2V)
100
V+
90
80 V-
70
60
50
40
30
20
10
0
0
0.5 1.0 1.5 2.0
OUTPUT CURRENT (mA)
2.5
2 _______________________________________________________________________________________




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