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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1720 Datasheet

Switched-Capacitor Voltage Inverters

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19-1439; Rev 2; 4/04
SOT23, Switched-Capacitor
Voltage Inverters with Shutdown
General Description
The ultra-small MAX1719/MAX1720/MAX1721 monolithic,
CMOS charge-pump inverters accept input voltages
ranging from +1.5V to +5.5V. The MAX1720 operates at
12kHz, and the MAX1719/MAX1721 operate at 125kHz.
High efficiency, small external components, and logic-
controlled shutdown make these devices ideal for both
battery-powered and board-level voltage conversion
applications.
Oscillator control circuitry and four power MOSFET
switches are included on-chip. A typical MAX1719/
MAX1720/MAX1721 application is generating a -5V
supply from a +5V logic supply to power analog circuitry.
All three parts come in a 6-pin SOT23 package and can
deliver a continuous 25mA output current.
For pin-compatible SOT23 switched-capacitor voltage
inverters without shutdown (5-pin SOT23), see the
MAX828/MAX829 and MAX870/MAX871 data sheets. For
applications requiring more power, the MAX860/MAX861
deliver up to 50mA. For regulated outputs (up to -2 x VIN),
refer to the MAX868. The MAX860/MAX861 and MAX868
are available in space-saving µMAX packages.
Applications
Local Negative Supply from a Positive Supply
Small LCD Panels
GaAs PA Bias Supply
Handy-Terminals, PDAs
Battery-Operated Equipment
Typical Operating Circuit
Features
1nA Logic-Controlled Shutdown
6-Pin SOT23 Package
99.9% Voltage Conversion Efficiency
50µA Quiescent Current (MAX1720)
+1.5V to +5.5V Input Voltage Range
25mA Output Current
Requires Only Two 1µF Capacitors
(MAX1719/MAX1721)
Ordering Information
PART
MAX1719EUT
MAX1720EUT
MAX1721EUT
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
6 SOT23-6
6 SOT23-6
6 SOT23-6
SOT
TOP MARK
AACA
AABS
AABT
Pin Configuration
1µF
INPUT
1.5V to 5.5V
C1+
IN
C1-
OUT
MAX1721
ON SHDN
OFF
GND
NEGATIVE
OUTPUT
-1 · VIN
25mA
1µF
TOP VIEW
OUT 1
6 C1+
IN 2
C1- 3
MAX1719
MAX1720
MAX1721
5 SHDN (SHDN)
4 GND
( ) ARE FOR MAX1719
SOT23-6
________________________________________________________________ Maxim Integrated Products 1
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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1720 Datasheet

Switched-Capacitor Voltage Inverters

No Preview Available !

SOT23, Switched-Capacitor
Voltage Inverters with Shutdown
ABSOLUTE MAXIMUM RATINGS
IN to GND .................................................................-0.3V to +6V
OUT to GND .............................................................-6V to +0.3V
C1+, SHDN, SHDN to GND .........................-0.3V to (VIN + 0.3V)
C1- to GND...............................................(VOUT - 0.3V) to +0.3V
OUT Output Current..........................................................100mA
OUT Short Circuit to GND..............................................Indefinite
Continuous Power Dissipation (TA = +70°C)
6-Pin SOT23 (derate 8.7mW/°C above +70°C).................696mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°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, SHDN = GND (MAX1719), SHDN = IN (MAX1720/MAX1721), C1 = C2 = 10µF (MAX1720), C1 = C2 = 1µF
(MAX1719/MAX1721), circuit of Figure 1, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
Supply Voltage Range
Quiescent Supply Current
(Note 3)
Shutdown Supply Current
Oscillator Frequency
Voltage Conversion Efficiency
Output Resistance (Note 1)
OUT to GND
Shutdown Resistance
SHDN/ SHDN Input Logic High
SHDN/ SHDN Input Logic Low
SHDN/ SHDN Bias Current
Wake-Up Time from Shutdown
SYMBOL
CONDITIONS
MAX1720
TA = +25°C
RL = 10k
TA = 0°C to + 85°C
VIN MAX1719/MAX1721 TA = +25°C
RL = 10k
TA = 0°C to + 85°C
ICC TA = +25°C
MAX1720
MAX1719/MAX1721
ISHDN
SHDN = IN (MAX1719), TA = +25°C
SHDN = GND
(MAX1720/MAX1721) TA = +85°C
fOSC TA = +25°C
MAX1720
MAX1719/MAX1721
IOUT = 0, TA = +25°C
RO
RO, SHDN
IOUT = 10mA
TA = +25°C
TA = 0°C to +85°C
SHDN = IN (MAX1719), SHDN = GND
(MAX1720/MAX1721), OUT is internally
forced to GND in shutdown
VIH
+2.5V VIN +5.5V
VIN (MIN) VIN +2.5V
VIL
+2.5V VIN +5.5V
VIN (MIN) VIN +2.5V
IIL, IIH
SHDN/ SHDN = GND TA = +25°C
or VIN
TA = +85°C
IOUT = 5mA
MAX1720
MAX1719/MAX1721
MIN
1.25
1.5
1.4
1.5
7
70
99
TYP
50
350
0.001
0.02
12
125
99.9
23
4
2.0
VIN - 0.2
-100
0.05
10
800
80
MAX
5.5
5.5
5.5
5.5
90
650
1
UNITS
V
µA
µA
17
kHz
180
%
50
65
12
V
0.6
V
0.2
100
nA
µs
2 _______________________________________________________________________________________


Part Number MAX1720
Description Switched-Capacitor Voltage Inverters
Maker Maxim Integrated
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MAX1720 Datasheet PDF






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