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MAX829C-D
Datasheet
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Maxim MAX829C-D, MAX829EUK, MAX828C-D, MAX828EUK Datasheet

_______________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 board­level 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 applications 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
♦ 5-Pin SOT23-5 Package ♦ 95% Voltage Conversion Efficiency ♦ Inverts Input Supply Voltage ♦ 60µA Quiescent Current (MAX828) ♦ +1.5V to +5.5V Input Voltage Range ♦ Requires Only Two Capacitors ♦ 25mA Output Current
MAX828/MAX829
Switched-Capacitor Voltage Inverters
________________________________________________________________
Maxim Integrated Products
1
TOP VIEW
IN
GND
C1-
C1+
OUT
SOT23-5
1
5
MAX828 MAX829
2
3
4
__________________Pin Configuration
NEGATIVE VOLTAGE CONVERTER
C1+
C1-
IN
OUT
GND
INPUT SUPPLY VOLTAGE
NEGATIVE OUTPUT VOLTAGE
MAX828 MAX829
4
3
52
1
__________Typical Operating Circuit
19-0495; Rev 2; 4/97
PART
MAX828C/D
MAX828EUK -40°C to +85°C
0°C to +70°C
TEMP. RANGE
PIN-
PACKAGE
Dice* 5 SOT23-5
______________Ordering Information
*
Dice are tested at TA= +25°C.
MAX829C/D MAX829EUK -40°C to +85°C
0°C to +70°C Dice*
5 SOT23-5
SOT
TOP MARK
—
AABI
—
AABJ
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.
MAX828/MAX829
Switched-Capacitor Voltage Inverters
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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 T
A
= +25°C.)
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 T
A
= +25°C.) (Note 2)
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.
Note 1: Capacitor contribution is approximately 20% of the output impedance [ESR + 1 / (pump frequency x capacitance)].
Note 2: All -40°C to +85°C specifications above are guaranteed by design.
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 (T
A
= +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, 10sec).............................+300°C
MAX829
MAX828
R
LOAD
= ∞
R
LOAD
= 10kΩ, TA= +25°C
MAX829
R
LOAD
= 10kΩ
R
LOAD
= 10kΩ
MAX828
CONDITIONS
µA
150 260
60 90
Supply Current
%95 99.9Voltage Conversion Efficiency
%98Power Efficiency
kHz
24.5 35 45.5
Oscillator Frequency
1.25 1.0 V
1.5
Minimum Supply Voltage
V5.5Maximum Supply Voltage
8.4 12 15.6
UNITSMIN TYP MAXPARAMETER
TA= +25°C TA= 0°C to + 85°C
I
OUT
= 5mA
TA= 0°C to + 85°C
TA= +25°C
Ω
65
Output Resistance
20 50
MAX829
MAX828
I
OUT
= 5mA
MAX829
R
LOAD
= 10kΩ
MAX828
CONDITIONS
µA
325
115
Supply Current
Ω65Output Resistance
kHz
19 54.3
Oscillator Frequency
V1.5 5.5Supply Voltage Range
6 20
UNITSMIN TYP MAXPARAMETER
TA= +25°C
TA= +25°C
MAX828/MAX829
Switched-Capacitor Voltage Inverters
_______________________________________________________________________________________
3
40
0
1.5 2.5
OUTPUT RESISTANCE vs. SUPPLY VOLTAGE
5
10
35
MAX828/829-01
SUPPLY VOLTAGE (V)
OUTPUT RESISTANCE (Ω)
3.5 5.54.5
30
20
25
15
MAX829
MAX828
50
10
OUTPUT RESISTANCE
vs. TEMPERATURE
15
40
45
MAX828/829-02
TEMPERATURE (°C)
OUTPUT RESISTANCE (Ω)
35 30
25 20
VIN = 3.3V
VIN = 5.0V
VIN = 1.5V
-40 -20 0 6020 40 80
45
0
0 105 15 35 40
MAX828
OUTPUT CURRENT vs. CAPACITANCE
5
35
40
MAX828/829-03
CAPACITANCE (µF)
OUTPUT CURRENT (mA)
20 25 30 45 50
30 25 20 15 10
VIN = 3.15V, V
OUT
= -2.5V
VIN = 1.9V, V
OUT
= -1.5V
VIN = 4.75V, V
OUT
= -4.0V
45
0
0 5 20 25
MAX829
OUTPUT CURRENT vs. CAPACITANCE
5
35
40
MAX828/829-04
CAPACITANCE (µF)
OUTPUT CURRENT (mA)
1510 30
30 25 20 15 10
VIN = 3.15V, V- = -2.5V
VIN = 1.9V, V- = -1.5V
VIN = 4.75V, V- = -4.0V
200
0
1.5 2.5
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
25
50
175
MAX828/829-07
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (µA)
3.5 5.54.5
150
100
125
75
MAX829
MAX828
500 450
0
0 5 20 25
MAX828
OUTPUT VOLTAGE RIPPLE
vs. CAPACITANCE
50
350
400
MAX828/829-05
CAPACITANCE (µF)
OUTPUT VOLTAGE RIPPLE (mVp-p)
1510 30
300 250 200 150 100
VIN = 4.75V, V
OUT
= -4.0V
V
IN
= 3.15V, V
OUT
= -2.5V
V
IN
= 1.9V, V
OUT
= -1.5V
450
0
0 5 20 25
MAX829
OUTPUT VOLTAGE RIPPLE
vs. CAPACITANCE
50
350
400
MAX828/829-06
CAPACITANCE (µF)
OUTPUT VOLTAGE RIPPLE (mVp-p)
1510 30
300 250
200 150 100
VIN = 4.75V, V
OUT
= -4.0V
V
IN
= 3.15V, V
OUT
= -2.5V
V
IN
= 1.9V, V
OUT
= -1.5V
60 55
45
35
25
15 10
-40 -20 0 60
MAX828
PUMP FREQUENCY vs. TEMPERATURE
20
50
MAX828/829-08
TEMPERATURE (°C)
PUMP FREQUENCY (kHz)
20 40 80
40
30
VIN = 3.3V
VIN = 5.0V
VIN = 1.5V
__________________________________________Typical Operating Characteristics
(Circuit of Figure 1, VIN= +5V, C1 = C2 = C3, TA= +25°C, unless otherwise noted.)
55
30
MAX829
PUMP FREQUENCY vs. TEMPERATURE
35
50
MAX828/829-9
TEMPERATURE (°C)
PUMP FREQUENCY (kHz)
45
40
VIN = 3.3V
VIN = 5.0V
VIN = 1.5V
-40 -20 0 6020 40 80
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