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MAX871EUK+TG002

P1-P3P4-P6P7-P8
General Description
The ultra-small MAX870/MAX871 monolithic, CMOS
charge-pump inverters accept input voltages ranging
from +1.4V to +5.5V. The MAX870 operates at 125kHz,
and the MAX871 operates at 500kHz. Their high efficien-
cy (90%) and low operating current (0.7mA for the
MAX870) make these devices ideal for both battery-pow-
ered and board-level voltage-conversion applications.
Oscillator control circuitry and four power MOSFET
switches are included on-chip. A typical MAX870/
MAX871 application is 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 MAX1720/MAX1721. For applications
requiring more power, the MAX860 delivers up to 50mA
with a voltage drop of 600mV, in a space-saving µMAX
package.
________________________Applications
Local -5V Supply from 5V Logic Supply
Small LCD Panels
Cell Phones
Medical Instruments
Handy-Terminals, PDAs
Battery-Operated Equipment
Features
♦ 5-Pin SOT23-5 Package
♦ 99% Voltage Conversion Efficiency
♦ Invert Input Supply Voltage
♦ 0.7mA Quiescent Current (MAX870)
♦ +1.4V to +5.5V Input Voltage Range
♦ Require Only Two Capacitors
♦ 25mA Output Current
♦ Shutdown Control
MAX870/MAX871
Switched-Capacitor Voltage Inverters
________________________________________________________________ Maxim Integrated Products 1
TOP VIEW
IN
GND
C1-
C1+
OUT
SOT23-5
1
5
MAX870
MAX871
2
3
4
Pin Configuration
NEGATIVE VOLTAGE CONVERTER
C1+
C1-
IN
OUT
GND
INPUT
SUPPLY
VOLTAGE
NEGATIVE
OUTPUT
VOLTAGE
MAX870
MAX871
4
3
52
1
Typical Operating Circuit
19-1240; Rev 1; 2/04
PART
MAX870EUK
-40°C to +85°C
TEMP RANGE
PIN-
PACKAGE
5 SOT23-5
Ordering Information
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
MAX871EUK
-40°C to +85°C 5 SOT23-5
SOT
TOP MARK
ABZN
ABZO
MAX870/MAX871
Switched-Capacitor Voltage Inverters
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
IN
= +5V, C1 = C2 = 1µF (MAX870), C1 = C2 = 0.33µF (MAX871), T
A
= 0°C to +85°C, unless otherwise noted. Typical values
are at T
A
= +25°C.)
ELECTRICAL CHARACTERISTICS
(V
IN
= +5V, C1 = C2 = 1µF (MAX870), C1 = C2 = 0.33µF (MAX871), T
A
= -40°C to +85°C, unless otherwise noted.) (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 are guaranteed by design.
Note 3: The MAX870/MAX871 may draw high supply current during startup, up to the minimum operating supply voltage. To guarantee
proper startup, the input supply must be capable of delivering 90mA more than the maximum load current.
IN to GND ..............................................................+6.0V to -0.3V
OUT to GND ..........................................................-6.0V to +0.3V
C1+ ..............................................................(V
IN
+ 0.3V) to -0.3V
C1-............................................................(V
OUT
- 0.3V) to +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
MAX870EUK/MAX871EUK ...............................-40°C to +85°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10s) .................................+300°C
MAX871
MAX870
R
LOAD
= 500kΩ,
T
A
=+25°C
R
LOAD
= 10kΩ
R
LOAD
= 10kΩ
T
A
= +25°C
CONDITIONS
mA
2.7 3.8
0.7 1.0
Supply Current
96 99
%
90
Power Efficiency
kHz
325 500 675
1.4 1.0
V
1.5
Minimum Supply Voltage
V5.5Maximum Supply Voltage
81 125 169
UNITSMIN TYP MAXPARAMETER
T
A
= +25°C
T
A
= 0°C to + 85°C
25
MAX871
MAX870
I
OUT
= 5mA
MAX871
R
LOAD
= 10kΩ
MAX870
CONDITIONS
mA
4.4
1.3
Supply Current (Note 3)
Ω65Output Resistance
kHz
225 775
Oscillator Frequency
V1.6Minimum Supply-Voltage Range
56 194
UNITSMIN TYP MAXPARAMETER
T
A
= +25°C (Note 3)
Oscillator Frequency
C1 = C2 = 0.47µF
I
OUT
=
5mA
C1 = C2 = 1µF
ΩOutput Resistance (Note 1)
20 50
MAX870
T
A
= +25°C C1 = C2 = 0.33µF 20 50
C1 = C2 = 0.22µF 25MAX871
C1 = C2 = 0.1µF 35
65T
A
= 0°C to + 85°C
75
MAX870
MAX871
MAX870
MAX871
R
LOAD
= ∞, T
A
=+25°C
%
98 99.3
Voltage Conversion Efficiency
MAX870
MAX871
R
LOAD
= ∞
%
97
Voltage Conversion Efficiency
95
MAX870
MAX871
R
LOAD
= 10kΩ V5.5Maximum Supply-Voltage Range
MAX870/MAX871
Switched-Capacitor Voltage Inverters
_______________________________________________________________________________________ 3
0
0.5
1.0
1.5
2.0
2.5
3.0
1.5 2.52.0 3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX870/71-TOC01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
MAX870
MAX871
60
10
1.5 2.5 3.02.0
OUTPUT RESISTANCE
vs. SUPPLY VOLTAGE
50
MAX828/829-02
SUPPLY VOLTAGE (V)
OUTPUT RESISTANCE (Ω)
3.5 4.0 5.54.5 5.0
40
20
30
MAX870
MAX871
0
15
10
5
20
25
30
35
40
45
50
-40 10-15 35 60 85
MAX870
OUTPUT RESISTANCE vs. TEMPERATURE
MAX870/71 ROC3
TEMPERATURE (°C)
OUTPUT RESISTANCE (Ω)
V
IN
= 1.5V
V
IN
= 3.3V
V
IN
= 5.0V
45
0
0 0.5 3.02.5
MAX870
OUTPUT CURRENT vs. CAPACITANCE
35
40
MAX870/871-04
CAPACITANCE (
µ
F)
OUTPUT CURRENT (mA)
1.0 1.5 2.0 3.5
30
25
20
10
5
15
V
IN
= 3.15V, V
OUT
= -2.5V
V
IN
= 1.9V, V
OUT
= -1.5V
V
IN
= 4.75V, V
OUT
= -4.0V
35
0
0 0.5 2.0
MAX871
OUTPUT CURRENT vs. CAPACITANCE
25
30
MAX870/871-07
CAPACITANCE (µF)
OUTPUT CURRENT (mA)
1.0 1.5 2.5
20
15
10
5
V
IN
= 3.15V, V
OUT
= -2.5V
V
IN
= 1.9V, V
OUT
= -1.5V
V
IN
= 4.75V, V
OUT
= -4.0V
450
0
0 0.5 2.0 2.5 3.0 4.03.5 4.5
MAX870
OUTPUT VOLTAGE RIPPLE
vs. CAPACITANCE
50
350
400
MAX870/871-05
CAPACITANCE (
µ
F)
OUTPUT VOLTAGE RIPPLE (mVp-p)
1.51.0 5.0
300
250
200
150
100
V
IN
= 4.75V, V
OUT
= -4.0V
V
IN
= 3.15V, V
OUT
= -2.5V
V
IN
= 1.9V, V
OUT
= -1.5V
0
20
10
40
30
60
50
70
-40 10-15 35 60 85
MAX871
OUTPUT RESISTANCE vs. TEMPERATURE
MAX870/71-TOC06
TEMPERATURE (°C)
OUTPUT RESISTANCE (Ω)
V
IN
= 1.5V
V
IN
= 3.3V
V
IN
= 5.0V
0
150
100
50
200
250
300
350
400
450
500
01.00.5 1.5 2.0 2.5
MAX871
OUTPUT VOLTAGE RIPPLE
vs. CAPACITANCE
MAX870/71 TOC08
CAPACITANCE (µF)
OUTPUT VOLTAGE RIPPLE (mVp-p)
V
IN
= 4.75V, V
OUT
= -4.0V
V
IN
= 3.15V, V
OUT
= -2.5V
V
IN
= 1.9V, V
OUT
= -1.5V
__________________________________________Typical Operating Characteristics
(Circuit of Figure 1, V
IN
= +5V, C1 = C2 = C3, T
A
= +25°C, unless otherwise noted.)
-5.0
-4.0
-4.5
-3.0
-3.5
-2.0
-2.5
-1.5
-0.5
-1.0
0
0 1015205 2530354045
MAX870
OUTPUT VOLTAGE
vs. OUTPUT CURRENT
MAX870/871-TOC9
OUTPUT CURRENT (mA)
OUTPUT VOLTAGE (V)
V
IN
= 2.0V
V
IN
= 3.3V
V
IN
= 5.0V
P1-P3P4-P6P7-P8

MAX871EUK+TG002

Mfr. #:
Buy MAX871EUK+TG002
Manufacturer:
Maxim Integrated
Description:
Switching Voltage Regulators
Lifecycle:
New from this manufacturer.
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