Datasheet

ManualsBrandsMICROCHIP TECHNOLOGY ManualsPMICsPMIC - DC/DC voltage regulator Switched-capacitor voltage converter SOT 23A 6

 2001-2012 Microchip Technology Inc. DS21516D-page 1

TC1240/TC1240A

Features

• Charge Pumps in 6-Pin SOT-23A Package

• >99% Typical Voltage Conversion Efficiency

• Voltage Doubling

• Input Voltage Range, TC1240: +2.5V to +4.0V,

TC1240A: +2.5V to +5.5V

• Low Output Resistance, TC1240: 17 (Typical)

TC1240A: 12 (Typical)

• Only Two External Capacitors Required

• Low Supply Current, TC1240: 180 µA (Typical)

TC1240A: 550 µA (Typical)

• Power-Saving Shutdown Mode (1 µA Maximum)

• Shutdown Input Fully Compatible with 1.8V Logic

Systems

Applications

• Cellular Phones

• Pagers

• PDAs, Portable Data Loggers

• Battery Powered Devices

• Handheld Instruments

Package Type

General Description

The TC1240/TC1240A is a doubling CMOS charge

pump voltage converter in a small 6-Pin SOT-23A

package. The TC1240 doubles an input voltage that

can range from +2.5V to +4.0V, while the TC1240A

doubles an input voltage that can range from +2.5V to

+5.5V. Conversion efficiency is typically >99%. Internal

oscillator frequency is 160 kHz for both devices. The

TC1240 and TC1240A have an active-high shutdown

that limits the current consumption of the devices to

less than 1 µA.

External component requirement is only two capacitors

for standard voltage doubler applications. All other

circuitry (including control, oscillator and power

MOSFETs) are integrated on-chip. Typical supply cur-

rent is 180 µA for the TC1240 and 550 µA for the

TC1240A. Both devices are available in a 6-Pin SOT-

23A surface mount package.

Typical Application Circuit

NOTE: 6-Pin SOT-23A is equivalent to the

C-

6-Pin SOT-23A

TC1240ECH

TC1240AECH

C+

GND

SHDN

OUT

EIAJ (SC-74A)

Positive Voltage Doubler

2 x INPUT

C+

C-

INPUT

GND

OUT

SHDN

OFF

TC1240

TC1240A

Positive Doubling Charge Pumps with Shutdown

in a SOT-23 Package

Summary of content (18 pages)

PAGE 1
TC1240/TC1240A Positive Doubling Charge Pumps with Shutdown in a SOT-23 Package Features General Description • • • • The TC1240/TC1240A is a doubling CMOS charge pump voltage converter in a small 6-Pin SOT-23A package. The TC1240 doubles an input voltage that can range from +2.5V to +4.0V, while the TC1240A doubles an input voltage that can range from +2.5V to +5.5V. Conversion efficiency is typically >99%. Internal oscillator frequency is 160 kHz for both devices.
PAGE 2
TC1240/TC1240A 1.0 ELECTRICAL CHARACTERISTICS † 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. Absolute Maximum Ratings † Input Voltage (VIN to GND) TC1240 ..........
PAGE 3
TC1240/TC1240A TC1240A ELECTRICAL SPECIFICATIONS Electrical Specifications: Unless otherwise noted, typical values apply at TA = +25°C. Minimum and maximum values apply for TA = -40° to +85°C, and VIN = +5.0V, C1 = C2 = 3.3 µF, SHDN = GND. Parameters Supply Current Sym Min Typ Max Units IDD — 550 900 µA RLOAD =  SHDN = VIN Shutdown Supply Current ISHDN — 0.01 1.0 µA Minimum Supply Voltage VMIN 2.5 — — V Conditions Maximum Supply Voltage VMAX — — 5.
PAGE 4
TC1240/TC1240A 2.0 TYPICAL PERFORMANCE CURVES Note: The graphs and tables provided following this note are a statistical summary based on a limited number of samples and are provided for informational purposes only. The performance characteristics listed herein are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
PAGE 5
TC1240/TC1240A Note: Unless otherwise indicated, typical values apply at TA = +25°C. SWITCHING FREQUENCY (kHz) 100 VIN = 4.0V 80 VIN = 2.8V 60 40 20 0 -50 -25 FIGURE 2-7: Temperature. 0 25 50 75 TEMPERATURE (°C) 100 125 Switching Frequency vs.  2001-2012 Microchip Technology Inc.
PAGE 6
TC1240/TC1240A 3.0 PIN DESCRIPTION The description of the pins are listed in Table 3-1. TABLE 3-1: PIN FUNCTION TABLE Pin No. Symbol 1 VIN 2 GND 3 C- 4 SHDN Shutdown input (active high) 5 VOUT Doubled output voltage 6 C+ DS21516D-page 6 Description Power supply input Ground Commutation capacitor negative terminal Commutation capacitor positive terminal  2001-2012 Microchip Technology Inc.
PAGE 7
TC1240/TC1240A 4.0 DETAILED DESCRIPTION 5.0 TYPICAL APPLICATIONS The TC1240/TC1240A charge pump converter doubles the voltage applied to the VIN pin. Conversion consists of a two-phase operation (Figure 4-1). During the first phase, switches S2 and S4 are open and S1 and S3 are closed. During this time, C1 charges to the voltage on VIN and load current is supplied from C2. During the second phase, S2 and S4 are closed, while S1 and S3 are open. 5.
PAGE 8
TC1240/TC1240A The switching frequency in Equation 5-1b is defined as one-half the oscillator frequency (i.e., FSW = FOSC/2). The 1/(FSW)(C1) term in Equation 5-1b is the effective output resistance of an ideal switched capacitor circuit (Figure 5-1 and Figure 5-2). The output voltage ripple is given by Equation 5-2. EQUATION 5-2: I OUT V RIPPLE = -------------------------------- + 2  I OUT   ESR C2  2  F SW   C 2  5.
PAGE 9
TC1240/TC1240A 5.4 Input Supply Bypassing 5.6 The VIN input should be capacitively bypassed to reduce AC impedance and minimize noise effects due to the switching internal to the device. The recommended capacitor should be a large value (at least equal to C1) connected from the input to GND. 5.5 Shutdown Input Voltage Doubler The most common application for charge pump devices is the doubler (Figure 5-3).
PAGE 10
TC1240/TC1240A 5.7 Cascading Devices 5.8 Two or more TC1240/TC1240As can be cascaded to increase output voltage (Figure 5-4). If the output is lightly loaded, it will be close to ((n + 1) x VIN), but will droop at least by ROUT of the first device multiplied by the IQ of the second. It can be seen that the output resistance rises rapidly for multiple cascaded devices.
PAGE 11
TC1240/TC1240A 6.0 PACKAGING INFORMATION 6.1 Package Marking Information 6-Pin SOT-23A 1 1 1 & 2 4 5 6 2 3 2 4 3 = part number code + temperature range (two-digit code) Device Code TC1240 DN TC1240A EN ex: 1240AECH = E N 3 represents year and 2-month code 4 represents production lot ID code  2001-2012 Microchip Technology Inc.
PAGE 12
TC1240/TC1240A 6-Lead Plastic Small Outline Transistor (CH) (SOT-23) Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging E E1 B p1 n D 1 α c A A2 φ L β Units Dimension Limits n p MIN A1 INCHES* NOM MAX MILLIMETERS NOM 6 0.95 1.90 0.90 1.18 0.90 1.10 0.00 0.08 2.60 2.80 1.50 1.63 2.80 2.95 0.35 0.45 0 5 0.09 0.15 0.35 0.43 0 5 0 5 MIN Number of Pins 6 Pitch .038 p1 Outside lead pitch (basic) .
PAGE 13
TC1240/TC1240A 7.0 REVISION HISTORY Revision D (December 2012) Added a note to each package outline drawing.  2001-2012 Microchip Technology Inc.
PAGE 14
TC1240/TC1240A NOTES: DS21516D-page 14  2001-2012 Microchip Technology Inc.
PAGE 15
TC1240/TC1240A PRODUCT IDENTIFICATION SYSTEM To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office. PART NO.
PAGE 16
TC1240/TC1240A NOTES: DS21516D-page 16  2001-2012 Microchip Technology Inc.
PAGE 17
Note the following details of the code protection feature on Microchip devices: • Microchip products meet the specification contained in their particular Microchip Data Sheet. • Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions. • There are dishonest and possibly illegal methods used to breach the code protection feature.
PAGE 18
Worldwide Sales and Service AMERICAS ASIA/PACIFIC ASIA/PACIFIC EUROPE Corporate Office 2355 West Chandler Blvd. Chandler, AZ 85224-6199 Tel: 480-792-7200 Fax: 480-792-7277 Technical Support: http://www.microchip.com/ support Web Address: www.microchip.