TC3684EUA - Microchip Technology

 2002 Microchip Technology Inc. DS21556B-page 1

MTC3682/TC3683/TC3684

Features

• Small 8-Pin MSOP Package

• Operates from 1.8V to 5.5V

• 120 Ohms (typ) Output Resistance

• 99% Voltage Conversion Efficiency

• Only 3 External Capac itor s Requ ired

• Power-Savi ng Shutdown Mode

• Low Active Supply Current

-95µA (typ) for TC3682

- 225µA (typ) for TC3683

- 700µA (typ) for TC3684

• Fully Compatible with 1.8V Logic Systems

Applications

• LCD Panel Bias

• Cellular Phones PA Bias

• Pagers

• PDAs, Portable Data Loggers

• Battery-Powered Devices

Device Selection Table

Package Type

General Description

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, a nd 125kHz for the TC 3684. When the SHDN

pin is he ld at a logic low , the d evice goes in to a very lo w

power mode of operation consuming less than 1µA

(typ) of supply current.

Low output source impedance (typically 120Ω), pro-

vides ou tput current up to 10mA. The TC3682/TC36 83/

TC3684 fe ature a 1.8V to 5.5V operati ng volt age 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).

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.

Functional Block Diagram

Part

Number Package Osc.

Freq.

(kHz)

Operating

Temp.

Range

TC3682EUA 8-Pin MSOP 12 -40°C to +85°C

TC3683EUA 8-Pin MSOP 35 -40°C to +85°C

TC3684EUA 8-Pin MSOP 125 -40°C to +85°C

C3682

C3683

C3684

OUT

SHDN

VIN

–

GND

–

C1+

-Pin M

SOP

C1+

C2+

VIN

C1–

C2–

TC3682

TC3683

TC3684

VOUT

–COUT

Input

GND

C1 must have a voltage rating ≥ VIN

C2 and COUT must have a voltage rating ≥ 2VIN

VOUT = -(2 x VIN)

SHDN ON

OFF

Inverting Charge Pump Voltage Doublers with Active Low Shutdown

TC3682/TC3683/TC3684

DS21556B-page 2  2002 Microchip Technology Inc.

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

Operati ng Temperature Range.............-40°C to +85°C

Storage Temperature (Unbiased).......-65°C to +150°C

*Stresses above those listed under "Absolute Maximum

Ratings" may cause permanent damage to the device. These

are stress ratings only and funct ional 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.

TC3682/TC3683/TC3684 ELECTRICAL SPECIFICATIONS

Electrical Characteristics: TA = -40°C to +85°C, VIN = +5V, C1 = C2 = 3.3µF (TC3682), C1 = C2 = 1µF (TC3683),

C1 = C2 = 0.33µF (TC3684), SHDN = GND, Typical values are at TA = +25°C

Symbol Parame ter Min Typ Max Units Device Test Condi tions

IDD Supply Current —

—

225

700

160

480

1500

µA TC3682

TC3683

TC3684

SHDN = VIN

ISHDN Shutdown Supply Current —0.5 2 µA All SHDN = GND, VIN = +5V

VMIN Minimum Supply Voltage 1.8 —— VAll R

LOAD = 1kΩ

VMAX Maximum Supply Voltage ——5.5 V All RLOAD = 1kΩ

FOSC Oscillator Frequency 8.4

24.5

125

15.6

45.5

170

kHz TC3682

TC3683

TC3684

VIH SHDN Input Logic High 1.4 —— VAll V

IN = VMIN to VMAX

VIL SHDN Input Logic Low ——0.4 V All VIN = VMIN to VMAX

VEFF Voltage Conver sion Efficiency 95 99 —%All R

LOAD = ∞

ROUT Output Resistance —120 170 ΩAll ILOAD = 0.5mA to 10mA (Note 1)

TWK Wake-up Ti me From Shutdown Mode —

—

1800

600

200

—

µsec TC3682

TC3683

TC3684

RLOAD = 2kΩ

Note 1: Capacitor contribution is approximately 20% of the output impedance (ESR = 1/ pump frequency x capacitance).

 2002 Microchip Technology Inc. DS21556B-page 3

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

1C1–C1 commutation capacitor negative terminal.

2 C2+ C2 commutation capacitor positive terminal.

3C2–C2 commutation capacitor negative terminal.

OUT Doubling inverting charge pump output (-2 x VIN).

5 GND Ground.

IN Positive power supply input.

7 C1+ C1 commutation capacitor positive terminal.

8 SHDN Shutdown input (active low).

TC3682/TC3683/TC3684

DS21556B-page 4  2002 Microchip Technology Inc.

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

capac itor s. Wh en th e shu tdo wn in put is hel d at a log ic

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 us es the ‘-VIN’ ou tput g enerate d from the

first stage to produce the ‘-2X’ output functi on from the

second stage switching matrix.

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).

When t he shutdown input is in a l ow state , the oscillat or

and both switch matrices are powered off placing the

TC3682/TC3683/TC3684 in the shutdown mode.

When t he 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/TC3 683 /T C368 4 ARCHITECTUR E

SHDN

ENABLE

-2VIN

-VIN

COUT2

VIN

Switch Matrix

(1st Stage)

Switch Matrix

(2nd Stage)

Oscillator

COUT1

 2002 Microchip Technology Inc. DS21556B-page 5

TC3682/TC3683/TC3684

4.0 APPLICATIONS INFORMATION

4.1 Output Voltage Considerations

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

par ti cul ar ca se, ‘-VIN’ is approximately -5V and ‘-2VIN’

is approximately -10V at very light loads and each

stage will droop according to the equation below:

VDROOP = IOUT x ROUT

4.2 Capacitor Selection

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.

Note: For proper charge pump operation, C1

must have a voltage rating greater than or

equal to V IN, while C2 and COUT must hav e

a voltage rating greater than or equal to

2VIN.

Table 4-1 shows various values of C1/C2 and the

corresponding output resistance values for VIN = 5V

@+25°C.

Table 4-2 shows the output voltage ripple for various

values of COUT (again assuming VIN = 5V @ +25°C).

The V RIPPLE valu es assum e a 1mA o utput lo ad current

and a 0.1Ω ESRCOUT.

TABLE 4-1: OUTPUT RESISTANCE

VS. C1/C2 (ESR = 0.1Ω)

TABLE 4-2: OUTPUT VOLTAGE RIPPLE

VS. COUT (ESR = 0.1Ω)

IOUT = 1mA

4.3 Input Suppl y Bypassing

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) b e connec ted from V IN to G ND for optima l

circuit performance.

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.

4.5 Inverting Volt age Doubler

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: A power supply bypass capacitor is

recommended.

The outp ut is equa l to -2V IN plus any vol tage dro ps du e

to loading. Refer to Table 4-1 and Table 4-2 for

capa ci tor selectio n guid eli nes .

FIGURE 4-1: INVERTING VOLTAGE

DOUBLER TEST CIRCUIT

4.6 Layout Considerations

As with any sw itching po wer supply ci rcuit, go od layout

pract ice is recomm ended . Mount compo nent s a s close

together as possible to minimize stray inductance and

capa citance . Also use a large groun d plane to m inimize

noise leakage into other circuitry.

C1, C2

(µF) TC3682

ROUT(Ω)TC3683

ROUT(Ω)TC3684

ROUT(Ω)

0.33 633 184 120

1 262 120 102

3.3 120 95 84

COUT

(µF) TC3682

VRIPPLE

(mV)

TC3683

VRIPPLE

(mV)

TC3684

VRIPPLE

(mV)

0.33 192 60 27

1632116

3.3 17 8 7

OUT

C3682

C3683

C3684

–

OUT

TC3682 3.3µF 3.3µF 3.3µF 3.3µF

TC3683 1µF 1µF 1µF 1µF

TC3684 0.33µF 0.33µF 0.33µF 0.33µF

TC3682/TC3683/TC3684

DS21556B-page 6  2002 Microchip Technology Inc.

5.0 P ACKAGING INFORMATION

5.1 Package Marking Information

Package marki ng data not available at this time.

5.2 Taping Form

5.3 Package Dimensions

Component Taping Orientation for 8-Pin MSOP Devices

Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size

8-Pin MSOP 12 mm 8 mm 2500 13 in

Carrier Tape, Number of Components Per Reel and Reel Size

User Direction of Feed

PIN 1

Standard Reel Component Orientation

for TR Suffix Device

8-Pin MSOP

.122 (3.10)

.114 (2.90)

.122 (3.10)

.114 (2.90)

.043 (1.10)

MAX.

.006 (0.15)

.002 (0.05)

.016 (0.40)

.010 (0.25)

.197 (5.00)

.189 (4.80)

.008 (0.20)

.005 (0.13)

.028 (0.70)

.016 (0.40)

6° MAX.

.026 (0.65) TYP.

PIN 1

Dimensions: inches (mm)

 2002 Microchip Technology Inc. DS21556B-page7

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.c om)

Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using.

New Customer Notification System

TC3682/TC3683/TC3684

DS21556B-page8  2002 Microchip Technology Inc.

NOTES:

 2002 Microchip Technology Inc. DS21556B-page 9

TC3682/TC3683/TC3684

Information contained in this publication regarding device

applications and the like is intended through sug gestion 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 Microc hip Technology Incorporated with respect

to the accuracy or use of such inf orm ation, or inf ringement 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.

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