MAX1720
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16
6
4
2
3
1
OSC
Capacitors = 10 mF
+
V
in
= −5.0 V
5
+
+
Figure 47. Negative Input Voltage Splitter
C
C
+
C
V
out
= −2.5 V
C
A single device can be used to split a negative input voltage. The output voltage is approximately equal to −V
in
/2. The
performance characteristics are shown below. Note that the converter has an output resistance of 10 W.
0
−1.5
−1.7
−1.9
403020
−2.1
−2.3
−2.5
10 50 80
I
out
, OUTPUT CURRENT (mA)
V
out
, OUTPUT VOLTAGE (V)
60 70
Figure 48. Negative Voltage Splitter Load Regulation, Output Voltage vs. Output Current
T
A
= 25°C
R
out
= 10 W
+
6
4
2
3
1
OSC
+
V
in
5
−V
out
+
Figure 49. Combination of a Closed Loop Negative Inverter with a Positive Output Voltage Doubler
Capacitors = 10 mF
10 k
+
+
R
1
R
2
+V
out
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17
All of the previously shown converter circuits have only single outputs. Applications requiring multiple outputs can be
constructed by incorporating combinations of the former circuits. The converter shown above combines Figures 26 and 32 to
form a regulated negative output inverter with a non−regulated positive output doubler. The magnitude of −V
out
is controlled
by the resistor values and follows the relationship −V
ref
(R
2
/R
1
+ 1). Since the positive output is not within the feedback loop,
its output voltage will increase as the negative output load increases. This cross regulation characteristic is shown in the upper
portion of Figure 50. The dashed line is the open loop and the solid line is the closed loop configuration for the load regulation.
The load regulation for the positive doubler with a constant load on the −V
out
is shown in Figure 51.
−4.0
−5.0
−3.0
8.0
9.0
I
out
, NEGATIVE INVERTER OUTPUT CURRENT (mA)
V
out
, OUTPUT VOLTAGE (V)
02010 30
Figure 50. Load Regulation, Output
Voltage vs. Output Current
8.0
7.0
9.0
10.0
I
out
, POSITIVE DOUBLER OUTPUT CURRENT (mA)
V
out
, OUTPUT VOLTAGE (V)
0302010 5
0
Figure 51. Load Regulation, Output
Voltage vs. Output Current
R
1
= 10 kW
R
2
= 20 kW
T
A
= 25°C
40
Negative Inverter I
out
= 15 mA
Negative Inverter
Positive Doubler
I
out
= 15 mA
R
out
= 45 W − Open Loop
R
out
= 2 W − Closed Loop
R1 = 10 k, R2 = 20 k
T
A
= 25°C
Figure 52. Inverter Circuit Board Layout, Top View Copper Side
V
in
GND
IC1 C
1
Inverter Size = 0.5 in x 0.2 in
Area = 0.10 in
2
, 64.5 mm
2
−V
out
GND
C
3
+
C
2
+
SHDN
+
0.5
TAPING FORM
PIN 1
USER DIRECTION OF FEED
Component Taping Orientation for TSOP−6 Devices
Standard Reel Component Orientation
(Mark Right Side Up)
DEVICE
MARKING
TSOP−6
Package Tape Width (W) Pitch (P) Part Per Full Reel Diameter
8 mm 4 mm 3000 7 inches
Tape & Reel Specifications Table
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18
PACKAGE DIMENSIONS
TSOP−6
CASE 318G−02
ISSUE P
23
456
D
1
e
b
E
A1
A
0.05 (0.002)
NOTES:
1. DIMENSIONING AND TOLERANCING PER
ANSI Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. MAXIMUM LEAD THICKNESS INCLUDES LEAD
FINISH THICKNESS. MINIMUM LEAD
THICKNESS IS THE MINIMUM THICKNESS OF
BASE MATERIAL.
4. DIMENSIONS A AND B DO NOT INCLUDE
MOLD FLASH, PROTRUSIONS, OR GATE
BURRS.
c
L
0.95
0.037
1.9
0.075
0.95
0.037
ǒ
mm
inches
Ǔ
SCALE 10:1
1.0
0.039
2.4
0.094
0.7
0.028
*For additional information on our Pb−Free strategy and soldering
details, please download the ON Semiconductor Soldering and
Mounting Techniques Reference Manual, SOLDERRM/D.
SOLDERING FOOTPRINT*
H
E
DIM
A
MIN NOM MAX MIN
MILLIMETERS
0.90 1.00 1.10 0.035
INCHES
A1 0.01 0.06 0.10 0.001
b 0.25 0.38 0.50 0.010
c 0.10 0.18 0.26 0.004
D 2.90 3.00 3.10 0.114
E 1.30 1.50 1.70 0.051
e 0.85 0.95 1.05 0.034
L 0.20 0.40 0.60 0.008
0.039 0.043
0.002 0.004
0.014 0.020
0.007 0.010
0.118 0.122
0.059 0.067
0.037 0.041
0.016 0.024
NOM MAX
2.50 2.75 3.00 0.099 0.108 0.118
H
E
0° 10° 0° 10°
q
q
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to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All
operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights
nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications
intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should
Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates,
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associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal
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MAX1720/D
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MAX1720EUTG

Mfr. #:
Manufacturer:
ON Semiconductor
Description:
Switching Voltage Regulators Switched Cap Voltage Inverter w/Shutdown
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