TC3683EUATR [MICROCHIP]
SWITCHED CAPACITOR CONVERTER, 45.5 kHz SWITCHING FREQ-MAX, PDSO8, MSOP-8;
| 型号： | TC3683EUATR |
| 厂家： | 
MICROCHIP |
| 描述： | SWITCHED CAPACITOR CONVERTER, 45.5 kHz SWITCHING FREQ-MAX, PDSO8, MSOP-8 开关 光电二极管 |
| 文件： | 总10页 (文件大小：404K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TC3682/TC3683/TC3684
M
Inverting Charge Pump Voltage Doublers with Active Low Shutdown
Features
General Description
• Small 8-Pin MSOP Package
• Operates from 1.8V to 5.5V
• 120 Ohms (typ) Output Resistance
• 99% Voltage Conversion Efficiency
• Only 3 External Capacitors Required
• Power-Saving Shutdown Mode
• Low Active Supply Current
The TC3682/TC3683/TC3684 are CMOS charge pump
converters that provide an inverted doubled output
from a single positive supply. An on-board oscillator
provides the clock and only three external capacitors
are required for full circuit implementation. Switching
frequencies are 12kHz for the TC3682, 35kHz for the
TC3683, and 125kHz for the TC3684. When the SHDN
pin is held at a logic low, the device goes into a very low
power mode of operation consuming less than 1µA
(typ) of supply current.
- 95µA (typ) for TC3682
- 225µA (typ) for TC3683
Low output source impedance (typically 120Ω), pro-
vides output current up to 10mA. The TC3682/TC3683/
TC3684 feature a 1.8V to 5.5V operating voltage range
and high efficiency, which make them an ideal choice
for a wide variety of applications requiring a negative
doubled voltage derived from a single positive supply
(for example: generation of -7.2V from a +3.6V lithium
cell or -10V generated from a +5V logic supply).
- 700µA (typ) for TC3684
• Fully Compatible with 1.8V Logic Systems
Applications
• LCD Panel Bias
• Cellular Phones PA Bias
• Pagers
The minimum external part count, small physical size
and shutdown mode feature make this family of prod-
ucts useful for a wide variety of negative bias power
supply applications.
• PDAs, Portable Data Loggers
• Battery-Powered Devices
Device Selection Table
Functional Block Diagram
Osc.
Freq.
(kHz)
Operating
Temp.
Range
Part
Number
Package
C1+
V
+
IN
Input
ON
C1
TC3682EUA 8-Pin MSOP
TC3683EUA 8-Pin MSOP
12
35
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
C1–
SHDN
OFF
C2+ TC3682
TC3684EUA 8-Pin MSOP 125
+
C2
TC3683
TC3684
C2–
Package Type
V
= -(2 x V )
IN
OUT
GND
8-Pin MSOP
V
OUT
–
C
OUT
C1
1
2
3
4
8
7
6
5
SHDN
+
C2+
OUT
C1+
TC3682
TC3683
TC3684
C1 must have a voltage rating ≥ V
IN
V
IN
C2 and C
must have a voltage rating ≥ 2V
OUT
IN
V
GND
2002 Microchip Technology Inc.
DS21556B-page 1
TC3682/TC3683/TC3684
*Stresses above 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 above those indicated in the
operation sections of the specifications is not implied.
Exposure to Absolute Maximum Rating conditions for
extended periods may affect device reliability.
1.0
ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings*
Input Voltage (VIN to GND)....................... +6.0V, -0.3V
Output Voltage (VOUT to GND)............... -12.0V, +0.3V
Current at VOUT Pin.............................................20mA
Short-Circuit Duration VOUT to GND ..............Indefinite
Power Dissipation (TA ≤ 70°C)
8-Pin MSOP .............................................320mW
Operating Temperature Range.............-40°C to +85°C
Storage Temperature (Unbiased).......-65°C to +150°C
TC3682/TC3683/TC3684 ELECTRICAL SPECIFICATIONS
Electrical Characteristics: T = -40°C to +85°C, V = +5V, C1 = C2 = 3.3µF (TC3682), C1 = C2 = 1µF (TC3683),
A
IN
C1 = C2 = 0.33µF (TC3684), SHDN = GND, Typical values are at T = +25°C
A
Symbol
Parameter
Supply Current
Min
Typ
Max
Units
Device
Test Conditions
I
—
—
—
95
225
700
160
480
1500
µA
TC3682
TC3683
TC3684
SHDN = V
DD
IN
IN
IN
SHDN = V
SHDN = V
I
Shutdown Supply Current
Minimum Supply Voltage
Maximum Supply Voltage
Oscillator Frequency
—
1.8
—
0.5
—
2
µA
V
All
All
All
SHDN = GND, V = +5V
IN
SHDN
V
—
R
R
= 1kΩ
= 1kΩ
MIN
LOAD
LOAD
V
—
5.5
V
MAX
OSC
F
8.4
24.5
65
12
35
125
15.6
45.5
170
kHz TC3682
TC3683
TC3684
V
V
V
SHDN Input Logic High
1.4
—
—
—
—
0.4
—
V
V
All
All
All
All
V
V
= V
= V
to V
MIN
IH
IN
MAX
MAX
SHDN Input Logic Low
to V
IL
IN
MIN
Voltage Conversion Efficiency
Output Resistance
95
—
99
%
Ω
R
I
= ∞
EFF
LOAD
R
120
170
= 0.5mA to 10mA (Note 1)
OUT
LOAD
TWK
Wake-up Time From Shutdown Mode
—
—
—
1800
600
200
—
—
—
µsec TC3682
TC3683
R
= 2kΩ
LOAD
TC3684
Note 1: Capacitor contribution is approximately 20% of the output impedance (ESR = 1/ pump frequency x capacitance).
DS21556B-page 2
2002 Microchip Technology Inc.
TC3682/TC3683/TC3684
2.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
PIN FUNCTION TABLE
Pin No.
(8-Pin MSOP)
Symbol
Description
1
2
3
4
5
6
7
8
C1–
C2+
C2–
C1 commutation capacitor negative terminal.
C2 commutation capacitor positive terminal.
C2 commutation capacitor negative terminal.
V
Doubling inverting charge pump output (-2 x V ).
OUT
IN
GND
Ground.
V
Positive power supply input.
C1 commutation capacitor positive terminal.
Shutdown input (active low).
IN
C1+
SHDN
2002 Microchip Technology Inc.
DS21556B-page 3
TC3682/TC3683/TC3684
Each device contains an on-board oscillator that
synchronously controls the operation of the charge
pump switching matrices. The TC3682 synchronously
switches at 12kHz, the TC3683 synchronously
switches at 35kHz, and the TC3684 synchronously
switches at 125kHz. The different oscillator frequencies
for this device family allow the user to trade-off
capacitor size versus supply current. Faster oscillators
can use smaller external capacitors, but will consume
more supply current (see Section 1.0 Electrical
Characteristics).
3.0
DETAILED DESCRIPTION
The TC3682/TC3683/TC3684 inverting charge pumps
perform a -2x multiplication of the voltage applied to
the VIN pin. Conversion is performed using two
synchronous switching matrices and three external
capacitors. When the shutdown input is held at a logic
low, the device goes into a very low power mode of
operation consuming less than 1µA of supply current.
Figure 3-1 is a block diagram representation of the
TC3682/TC3683/TC3684 architecture. The first switch-
ing stage inverts the voltage present at VIN and the
second stage uses the ‘-VIN’ output generated from the
first stage to produce the ‘-2X’ output function from the
second stage switching matrix.
When the shutdown input is in a low state, the oscillator
and both switch matrices are powered off placing the
TC3682/TC3683/TC3684 in the shutdown mode.
When the VIN supply input is powered from an external
battery, the shutdown mode minimizes power
consumption, which in turn will extend the life of the
battery.
FIGURE 3-1:
TC3682/TC3683/TC3684 ARCHITECTURE
V
IN
+
-V
IN
C1
Switch Matrix
(1st Stage)
C
OUT1
+
ENABLE
Oscillator
ENABLE
+
-2V
IN
C2
Switch Matrix
(2nd Stage)
C
OUT2
+
ENABLE
SHDN
DS21556B-page 4
2002 Microchip Technology Inc.
TC3682/TC3683/TC3684
4.3
Input Supply Bypassing
4.0
4.1
APPLICATIONS INFORMATION
Output Voltage Considerations
The VIN input should be capacitively bypassed to
reduce AC impedance and minimize noise effects due
to the switching internal to the device. It is
recommended that a large value capacitor (at least
equal to C1) be connected from VIN to GND for optimal
circuit performance.
The TC3682/TC3683/TC3684 perform inverting
voltage conversions but do not provide any type of
regulation. The output voltage will droop in a linear
manner with respect to the output load current. The
value of the equivalent output resistance of the ‘-VIN’
output is approximately 50Ω nominal at +25°C and
VIN = +5V. The value of the ‘-2VIN’ output is approxi-
mately 140Ω nominal at +25°C and VIN = +5V. In this
particular case, ‘-VIN’ is approximately -5V and ‘-2VIN’
is approximately -10V at very light loads and each
stage will droop according to the equation below:
4.4
Shutdown Input
The TC3682/TC3683/TC3684 is enabled when SHDN
is high, and disabled when SHDN is low. This input
cannot be allowed to float. (If SHDN is not required, see
the TC2682/TC2683/TC2684 data sheet.) The SHDN
input should be limited to 0.3V above VIN.
VDROOP = IOUT x ROUT
4.5
Inverting Voltage Doubler
4.2
Capacitor Selection
The most common application for the TC3682/TC3683/
TC3684 devices is the inverting voltage doubler
(Figure 4-1). This application uses three external
capacitors: C1, C2 and COUT
Note: power supply bypass capacitor is
recommended.
In order to maintain the lowest output resistance and
output ripple voltage, it is recommended that low ESR
capacitors be used. Additionally, larger values of C1
and C2 will lower the output resistance and larger
values of COUT will reduce output ripple.
.
A
Note: For proper charge pump operation, C1
must have a voltage rating greater than or
equal to VIN, while C2 and COUT must have
a voltage rating greater than or equal to
2VIN.
The output is equal to -2VIN plus any voltage drops due
to loading. Refer to Table 4-1 and Table 4-2 for
capacitor selection guidelines.
FIGURE 4-1:
INVERTING VOLTAGE
Table 4-1 shows various values of C1/C2 and the
corresponding output resistance values for VIN = 5V
@ +25°C.
DOUBLER TEST CIRCUIT
V
IN
+
C
IN
Table 4-2 shows the output voltage ripple for various
values of COUT (again assuming VIN = 5V @ +25°C).
The VRIPPLE values assume a 1mA output load current
6
8
V
7
SHDN
IN
+
C1
+
+
C1
C2
and a 0.1Ω ESRCOUT
.
1
2
TC3682
TC3683
TC3684
C1
C2
TABLE 4-1:
OUTPUT RESISTANCE
+
VS. C1/C2 (ESR = 0.1Ω)
4
-2V
IN
V
OUT
C
3
OUT
C2
C1, C2
(µF)
TC3682
ROUT(Ω)
TC3683
ROUT(Ω)
TC3684
ROUT(Ω)
R
L
+
GND
5
0.33
1
633
262
120
184
120
95
120
102
84
Device
TC3682
TC3683
C
3.3µF
1µF
C1
3.3µF
1µF
C2
3.3µF
1µF
C
OUT
3.3µF
1µF
IN
3.3
TC3684 0.33µF 0.33µF
0.33µF
0.33µF
TABLE 4-2:
OUTPUT VOLTAGE RIPPLE
4.6
Layout Considerations
VS. COUT (ESR = 0.1Ω)
IOUT = 1mA
As with any switching power supply circuit, good layout
practice is recommended. Mount components as close
together as possible to minimize stray inductance and
capacitance. Also use a large ground plane to minimize
noise leakage into other circuitry.
TC3682
VRIPPLE
(mV)
TC3683
VRIPPLE
(mV)
TC3684
VRIPPLE
(mV)
COUT
(µF)
0.33
1
192
63
60
21
8
27
16
7
3.3
17
2002 Microchip Technology Inc.
DS21556B-page 5
TC3682/TC3683/TC3684
5.0
5.1
PACKAGING INFORMATION
Package Marking Information
Package marking data not available at this time.
5.2
Taping Form
Component Taping Orientation for 8-Pin MSOP Devices
User Direction of Feed
PIN 1
P
Standard Reel Component Orientation
for TR Suffix Device
Carrier Tape, Number of Components Per Reel and Reel Size
Package
Carrier Width (W)
Pitch (P)
Part Per Full Reel
Reel Size
8-Pin MSOP
12 mm
8 mm
2500
13 in
5.3
Package Dimensions
8-Pin MSOP
PIN 1
.197 (5.00)
.189 (4.80)
.122 (3.10)
.114 (2.90)
.026 (0.65) TYP.
.122 (3.10)
.114 (2.90)
.043 (1.10)
MAX.
.008 (0.20)
.005 (0.13)
6° MAX.
.016 (0.40)
.010 (0.25)
.006 (0.15)
.002 (0.05)
.028 (0.70)
.016 (0.40)
Dimensions: inches (mm)
DS21556B-page 6
2002 Microchip Technology Inc.
TC3682/TC3683/TC3684
Sales and Support
Data Sheets
Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recom-
mended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following:
1. Your local Microchip sales office
2. The Microchip Corporate Literature Center U.S. FAX: (480) 792-7277
3. The Microchip Worldwide Site (www.microchip.com)
Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using.
New Customer Notification System
Register on our web site (www.microchip.com/cn) to receive the most current information on our products.
2002 Microchip Technology Inc.
DS21556B-page7
TC3682/TC3683/TC3684
NOTES:
DS21556B-page8
2002 Microchip Technology Inc.
TC3682/TC3683/TC3684
Information contained in this publication regarding device
applications and the like is intended through suggestion only
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
No representation or warranty is given and no liability is
assumed by Microchip Technology Incorporated with respect
to the accuracy or use of such information, or infringement of
patents or other intellectual property rights arising from such
use or otherwise. Use of Microchip’s products as critical com-
ponents in life support systems is not authorized except with
express written approval by Microchip. No licenses are con-
veyed, implicitly or otherwise, under any intellectual property
rights.
Trademarks
The Microchip name and logo, the Microchip logo, FilterLab,
KEELOQ, microID, MPLAB, PIC, PICmicro, PICMASTER,
PICSTART, PRO MATE, SEEVAL and The Embedded Control
Solutions Company are registered trademarks of Microchip Tech-
nology Incorporated in the U.S.A. and other countries.
dsPIC, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB,
In-Circuit Serial Programming, ICSP, ICEPIC, microPort,
Migratable Memory, MPASM, MPLIB, MPLINK, MPSIM,
MXDEV, PICC, PICDEM, PICDEM.net, rfPIC, Select Mode
and Total Endurance are trademarks of Microchip Technology
Incorporated in the U.S.A.
Serialized Quick Turn Programming (SQTP) is a service mark
of Microchip Technology Incorporated in the U.S.A.
All other trademarks mentioned herein are property of their
respective companies.
© 2002, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
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The Company’s quality system processes and
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2002 Microchip Technology Inc.
DS21556B-page 9
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03/01/02
'ꢀꢁꢂꢃ"!%ꢄ'
DS21556B-page 10
2002 Microchip Technology Inc.
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