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부품번호 | AMS682ES 기능 |
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기능 | INVERTING VOLTAGE DOUBLER | ||
제조업체 | Advanced Monolithic Systems | ||
로고 | |||
Advanced
Monolithic
Systems
AMS682
INVERTING VOLTAGE DOUBLER
FEATURES
• 99.9% Voltage Conversion Efficiency
• 92% Power Conversion Efficiency
• Wide Input Voltage Range +2.4V to 5.5V
• 185µA Supply Current
• Available in SO-8 and PDIP Packages
• Only 3 external Capacitors Required
APPLICATIONS
• Portable Handheld Instrumentation
• Cellular Phones
• Panel Meters
• -10V from +5V logic Supply
• -6V from a Single 3V Lithium Cell
• LCD Display Bias Generator
• Operational Amplifiers Power Supplies
GENERAL DESCRIPTION
The AMS682 is a CMOS charge pump converter that provides an inverted doubled output from a single positive supply.
Requiring only three external capacitors for full circuit implementation the device has an on -board 12kHz (typical) oscillator
which provides the clock.
Low output source impedance (typically 140Ω), provides output current up to 10mA. The AMS682 features low quiescent
current and high efficiency, making it the ideal choice for a wide variety of applications that require a negative voltage
derived from a single positive supply. The compact size and minimum external parts count of the AMS682 makes it useful in
many medium current, dual voltage analog power supplies.
The AMS682E is operational in the full industrial temperature range of -40°C to 85°C while AMS682C is operating over a
0°C to 70°C temperature range. The AMS682E/AMS682C are available in surface mount 8-Pin SOIC (SO-8) and 8-Pin
Plastic DIP (PDIP) packages.
ORDERING INFORMATION:
PACKAGE TYPE
8 LEAD SOIC
8 LEAD PDIP
AMS682ES
AMS682CS
AMS682EP
AMS682CP
OPERATING
TEMPERATURE RANGE
-40 to 85° C
0 to 70° C
TYPICAL OPERATING CIRCUIT
VIN +2.4V < VIN < +5.5V
+
C1 -
+
C2 -
C1+
VIN
ON/OFF
C1-
C2+
C2-
VOUT
GND
GND
All Caps = 3.3µF
VOUT = -(2 X VIN)
VOUT
COUT
+
PIN CONFIGURATIONS
8-LEAD DIP/ 8-LEAD SOIC
C-2 1
C+2 2
C-2 3
VOUT 4
AMS682
8 ON/OFF
7 C+1
6 VIN
5 GND
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
APPLICATIONS (Continued)
Capacitor Selection
The output resistance of the AMS682 is determined in part by
the ESR of the capacitors used. An expression for ROUT is
derived as shown below:
ROUT = 2( RSW1+RSW2+ESRC1+ RSW3+RSW4+ESRC2)
+2(RSW1+RSW2+ESRC1+ RSW3+RSW4+ESRC2)
+1/ (fPUMP X C1) +1/ (fPUMP X C2) + ESRC3
Assuming all switch resistances are approximately equal:
ROUT = 16 RSW+ 4ESRC1+ 4ESRC2+ ESRC3
+1/ (fPUMP X C1) +1/ (fPUMP X C2)
ROUT is typically 140Ω at +25°C with VIN =+5V and 3.3µF
low ESR capacitors. The fixed term (16RSW) is about 80-
90Ω. Increasing or decreasing values of C1 and C2 will affect
efficiency by changing ROUT.
Table 1 shows ROUT for various values of C1 and C2 (assume
0.5Ω ESR). C1 must be rated at 6VDC or greater while C2
and C3 must be rated at 12VDC or greater.
Output voltage ripple is affected by C3. Typically the larger
the value of C3 the less the ripple for a given load current.
The formula for p-p VRIPPLE is :
VRIPPLE = [1/[2(fPUMP X C3)]+2(ESRC3)] (IOUT)
For a 10µF (0.5Ω ESR), fPUMP = 10kHz and IOUT=10mA the
peak -to-peak ripple voltage at the output will be less than
60mV. In most applications (IOUT ≤ 10mA) a 10-20µF
capacitor and 1-5µF pump capacitors will be sufficient. Table
2 shows VRIPPLE for different values of C3 (assume 1Ω ESR).
Table 1. ROUT vs. C1, C2
C1, C2 (µF)
0.05
0.10
0.47
1.00
3.30
5.00
10.00
22.00
100.00
ROUT (Ω)
4085
2084
510
285
145
125
105
94
87
AMS682
Paralleling devices
Paralleling multiple AMS682 reduces the output resistance of
the converter. The effective output resistance is the output
resistance of one device divided by the number of devices.
Figure 5 illustrates how each device requires separate pump
capacitors C1 and C2, but all can share a single reservoir
capacitor.
-5V Regulated Supply From A Single 3V Battery
Figure 6 shows a -5V power supply using one 3V battery.
The AMS682 provides -6V at V-OUT , which is regulated to -5V
by the negative LDO. The AMS682 input can vary from 3V to
5.5V without affecting regulation significantly. A voltage
detector is connected to the battery to detect undervoltage.
This unit is set to detect at 2.7V. With higher input voltage,
more current can be drawn from the outputs of the AMS682.
With 5V at VIN , 10mA can be drawn from the regulated
output. Assuming 150Ω source resistance for the converter,
with IL=10mA, the charge pump will drop 1.5V.
Table 2. VRIPPLE Peak-to-Peak vs. C3 (IOUT =10mA)
C3(µF)
VRIPPLE (mV)
0.50 1020
1.00 520
3.30 172
5.00 120
10.00
70
22.00
43
100.00
25
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
4페이지 PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted.
8 LEAD SOIC PLASTIC PACKAGE (S)
AMS682
0.189-0.197*
(4.801-5.004)
87 6
5
0.228-0.244
(5.791-6.197)
0.150-0.157**
(3.810-3.988)
12 34
0.053-0.069
(1.346-1.752)
0.004-0.010
(0.101-0.254)
0.010-0.020
(0.254-0.508)
x 45°
0.008-0.010
(0.203-0.254)
0.014-0.019
(0.355-0.483)
0.050
(1.270)
TYP
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
0.016-0.050
(0.406-1.270)
0°-8° TYP
S (SO-8 ) AMS DRW# 042293
8 LEAD PLASTIC DIP PACKAGE (P)
0.400*
(10.160)
MAX
87 65
0.255±0.015*
(6.477±0.381)
1 2 34
0.045-0.065
(1.143-1.651)
0.065
(1.651)
TYP
0.005
(0.127)
MIN
0.100±0.010
(2.540±0.254)
0.130±0.005
(3.302±0.127)
0.125
(3.175)
MIN
0.018±0.003
(0.457±0.076)
0.015
(0.380)
MIN
*DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTUSIONS.
MOLD FLASH OR PROTUSIONS SHALL NOT EXCEED 0.010" (0.254mm)
0.300-0.325
(7.620-8.255)
0.009-0.015
(0.229-0.381)
0.325 +0.025
-0.015
(8.255 +0.635 )
-0.381
P (8L PDIP ) AMS DRW# 042294
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
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부품번호 | 상세설명 및 기능 | 제조사 |
AMS682EP | INVERTING VOLTAGE DOUBLER | Advanced Monolithic Systems |
AMS682ES | INVERTING VOLTAGE DOUBLER | Advanced Monolithic Systems |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |