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PDF MAX864 Data sheet ( Hoja de datos )
| Número de pieza | MAX864 | |
| Descripción | Dual-Output Charge Pump with Shutdown | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-0478; Rev 0; 3/96
Dual-Output Charge Pump with Shutdown
_______________General Description
The MAX864 CMOS, charge-pump, DC-DC voltage
converter produces a positive and a negative output
from a single positive input, and requires only four
capacitors. The charge pump first doubles the input
voltage, then inverts the doubled voltage. The input
voltage ranges from +1.75V to +6.0V.
The internal oscillator can be pin-programmed from
7kHz to 185kHz, allowing the quiescent current, capac-
itor size, and switching frequency to be optimized. The
55Ω output impedance permits useful output currents
up to 20mA. The MAX864 also has a 1µA logic-con-
trolled shutdown.
The MAX864 comes in a 16-pin QSOP package that
uses the same board area as a standard 8-pin SOIC.
For more space-sensitive applications, the MAX865 is
available in an 8-pin µMAX package, which uses half
the board area of the MAX864.
________________________Applications
Low-Voltage GaAsFET Bias in Wireless Handsets
VCO and GaAsFET Supply
Split Supply from 2 to 4 Ni Cells or 1 Li+ Cell
Low-Cost Split Supply for Low-Voltage
Data-Acquisition Systems
Split Supply for Analog Circuitry
LCD Panels
____________________________Features
o Requires Only Four Capacitors
o Dual Outputs (Positive and Negative)
o Low Input Voltages: +1.75V to +6.0V
o 1µA Logic-Controlled Shutdown
o Selectable Frequencies Allow Optimization
of Capacitor Size and Supply Current
______________Ordering Information
PART
MAX864C/D
MAX864EEE
TEMP. RANGE
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
Dice*
16 QSOP
* Contact factory for dice specifications.
__________Typical Operating Circuit
__________________Pin Configuration
TOP VIEW
C1- 1
C2+ 2
GND 3
C2- 4
V- 5
SHDN 6
FC1 7
FC0 8
MAX864
QSOP
16 C1+
15 V+
14 N.C.
13 N.C.
12 IN
11 GND
10 N.C.
9 N.C.
VIN
(+1.75V TO +6.0V)
IN V+
C1+
MAX864
C1-
C2+
V-
C2-
FC0 FC1 SHDN GND
VIN VIN VIN
+2VIN
-2VIN
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
1 page  
Dual-Output Charge Pump with Shutdown
____________________________Typical Operating Characteristics (continued)
(VIN = 5.0V, capacitor values in Table 1, TA = +25°C, unless otherwise noted.)
TIME TO EXIT SHUTDOWN
+5V
0V
+10V
FC0 = FC1 = IN (185kHz), C1–C4 = 1µF
FC0 = FC1 = GND (7kHz), C1–C4 = 33µF
0V
-10V
1ms/div
_____________________Pin Description
PIN
1
2
3, 11
4
5
6
7
8
9, 10,
13, 14
12
15
16
NAME
C1-
C2+
GND
C2-
V-
SHDN
FC1
FC0
N.C.
IN
V+
C1+
FUNCTION
Negative Terminal of the Flying Boost
Capacitor
Positive Terminal of the Flying
Inverting Capacitor
Ground (connect pins 3 and 11 together)
Negative Terminal of the Flying
Inverting Capacitor
Output of the Inverting Charge Pump
Active-Low Shutdown Input. With
SHDN low, the part is in shutdown
mode and its supply current is less
than 1µA. In shutdown mode, V+
connects to IN through a 22Ω switch,
and V- connects to GND through a
6Ω switch.
Frequency Select, MSB (see Table 1)
Frequency Select, LSB (see Table 1)
No Connect—no internal connection.
Connect these to ground to improve
thermal dissipation.
Positive Power-Supply Input
Output of the Boost Charge Pump
Positive Terminal of the Flying Boost
Capacitor
VCC IN
C1
C2
+5V
MAX864
1 C1-
C1+ 16
2 C2+
3
GND
V+ 15
N.C. 14
4 C2-
N.C. 13
5 V-
6 SHDN
7 FC1
IN 12
GND 11
N.C. 10
8 FC0
N.C. 9
SEE TABLE 1 FOR CAPACITOR VALUES.
C3
IL+
V+ OUT
RL+
C4
IL-
RL-
V- OUT
Figure 1. Test Circuit
_______________________________________________________________________________________ 5
5 Page 
Dual-Output Charge Pump with Shutdown
________________________________________________________Package Information
INCHES
DIM
MIN MAX
MILLIMETERS
INCHES MILLIMETERS
MIN
MAX
DIM PINS
MIN MAX MIN MAX
A 0.061 0.068 1.55 1.73
D 16 0.189 0.196 4.80 4.98
D
A1 0.004 0.0098 0.127 0.25
S 16 0.0020 0.0070 0.05 0.18
A2 0.055 0.061 1.40 1.55
D 20 0.337 0.344 8.56 8.74
A
e B A1
B 0.008 0.012 0.20 0.31
C 0.0075 0.0098 0.19 0.25
D SEE VARIATIONS
E 0.150 0.157 3.81 3.99
e 0.25 BSC
0.635 BSC
S 20 0.0500 0.0550 1.27 1.40
D 24 0.337 0.344 8.56 8.74
S 24 0.0250 0.0300 0.64 0.76
D 28 0.386 0.393 9.80 9.98
S 28 0.0250 0.0300 0.64 0.76
H 0.230 0.244 5.84 6.20
21-0055A
S h 0.010 0.016 0.25 0.41
L 0.016 0.035 0.41 0.89
N SEE VARIATIONS
S SEE VARIATIONS
α 0° 8° 0° 8°
EH
A2
N
h x 45°
E
α
QSOP
QUARTER
SMALL-OUTLINE
PACKAGE
CL
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MAX864.PDF ] | |
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