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TC125/TC126
PFM Step-Up DC/DC Regulators
Features
* Assured Start-up at 0.9V * PFM (100kHz Max Operating Frequency) * 40A Maximum Supply Current (VOUT = 3V @ 30mA) * 0.5A Shutdown Mode (TC125) * Voltage Sense Input (TC126) * Requires Only Three External Components * 80mA Maximum Output Current * Small Package: 5-Pin SOT-23A
General Description
The TC125/126 step-up (Boost) switching regulators furnish output currents to a maximum of 80mA (VIN = 2V, VOUT = 3V) with typical efficiencies above 80%. These devices employ pulse frequency modulation (PFM) for minimum supply current at low loads. They are ideal for battery-operated applications powered from one or more cells. Maximum supply current is less than 70A at full output load, and less than 5A in standby (VOUT = 3V). Both devices require only an external inductor, diode, and capacitor to implement a complete DC/DC regulator. The TC126 has separate output voltage sensing and chip power inputs for greater application flexibility. The TC125 combines the output voltage sensing and chip power inputs onto a single package pin, but adds a power-saving shutdown mode that suspends regulator operation and reduces supply current to less than 0.5A when the shutdown control input (SHDN) is low. The TC125/TC126 are available in a small 5-Pin SOT-23A package, occupy minimum board space and use small external components. The TC125 accepts input voltages from 2V to 10V. The TC126 accepts input voltages from 2.2V to 10V. Both the TC125 and TC126 have a start-up voltage of 0.9V at light load.
Applications
* * * * Palmtops/PDAs Battery-Operated Systems Cameras Portable Communicators
Device Selection Table
Part Number TC125501ECT TC125331ECT TC125301ECT TC126503ECT TC126333ECT TC126303ECT Output Voltage (V)* 5.0 3.3 3.0 5.0 3.3 3.0 Package 5-Pin SOT-23A 5-Pin SOT-23A 5-Pin SOT-23A 5-Pin SOT-23A 5-Pin SOT-23A 5-Pin SOT-23A Operating Temp. Range -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C
Typical Application
Sumida 100H CD54 VIN + MA735 VOUT 5V @80mA
*Other output voltages are available. Please contact Microchip Technology Inc. for details.
+
5 LX 2 x "AA" Cell 3V SHDN 1
4 GND
-
47F/16V Tantalum
Package Type
5-Pin SOT-23A
LX 5 GND 4 LX 5 GND 4
TC125
PS 2 NC 3
Two Cell to 5V Boost Regulator
TC125
1 SHDN 2 PS 3 NC 1
TC126
2 VDD 3 NC
SENSE
NOTE: 5-Pin SOT-23A is equivalent to the EIAJ SC-74A
2002 Microchip Technology Inc.
DS21372B-page 1
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TC125/TC126
1.0 ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings*
Voltage on VDD, SENSE/VDD, LX, SHDN Pins ....................................................... -0.3V to +12V LX Sink Current ............................................ 400mA pk Power Dissipation.............................................150mW Operating Temperature Range............. -40C to +85C Storage Temperature Range .............. -40C to +125C
*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.
TC125/TC126 ELECTRICAL SPECIFICATIONS
Electrical Characteristics: VIN = VOUT x 0.6, TA = 25C, SHDN = VOUT (TC125), unless otherwise noted. Symbol VOUT VDD VSTART IDD Parameter Output Voltage Operating Supply Voltage Start-Up Supply Voltage Operating Supply Current TC125 TC125/126 TC125/126 No Load Supply Current Min VR - 2.5% 0.70 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 70 85 0.7 -- -- -- 0.75 -- -- -0.25 Typ VR 0.5% -- 0.80 14 20 32 5 5 6 2 3 3 -- 10 6 3 -- 75 100 -- 70 80 85 -- -- -- -- Max VR + 2.5% 10.0 0.90 28 40 64 9 10 11 4 5 5 0.5 14 8 5 1 80 115 1.1 -- -- -- -- 0.20 0.25 -- A Units V V V A Note 4 IOUT = 1mA (Note 2) VOUT = 2V, IOUT = 10mA VOUT = 3V, IOUT = 30mA VOUT = 5V, IOUT = 50mA IOUT = 0, VOUT = 2V VOUT = 3V VOUT = 5V VIN = VOUT + 0.5V, VIN = 2V VIN = 3V VIN = 5V SHDN = VIL, (Note 2) VLX = 0.4V, VOUT = 2V VOUT = 3V VOUT = 5V (Note 2), (Note 3) No external components, VOUT = VLX = 10V Measured at LX pin (Note 2) Note 2 Note 2 VOUT = 2V VOUT = 3V VOUT = 5V Test Conditions
INL
ISTBY
Standby Supply Current
A
ISHDN RLX(ON)
Shutdown Supply Current LX Pin ON Resistance
A
ILX DCYCLE fMAX VLXLIM
LX Pin Leakage Current Duty Cycle Maximum Oscillator Frequency LX Pin Limit Voltage Efficiency
A % kHz V %
VIH VIL IINH IINL
Note 1: 2: 3: 4:
SHDN Input Logic High SHDN Input Logic Low SHDN Input Current (High) SHDN Pin Input Current (Low)
V V A A
VR is the factory output voltage setting. VIN = VOUT x 0.95. VDD input tied to SENSE input for TC126, as shown in Figure 3-2. The VPS input of the TC125 must be operated between 2.0V and 10.0V for spec compliance. The VDD input of the TC126 must be operated between 2.2V and 10.0V for spec compliance.
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DS21372B-page 2
2002 Microchip Technology Inc.
TC125/TC126
2.0 PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
TC125 Pin No. (5-Pin SOT-23A) 1
PIN FUNCTION TABLE
TC126 Pin No. (5-Pin SOT-23A) -- Symbol SHDN Description Shutdown input. A logic low on this input suspends device operation and supply current is reduced to less than 0.5A. The device resumes normal operation when SHDN is again brought high. Voltage sense input. This input provides feedback voltage sensing to the internal error amplifier. It must be connected to the output voltage node, preferably the single point in the system where tight voltage regulation is most beneficial. Power and voltage sense input. This dual function input provides both feedback voltage sensing and internal chip power. It should be connected to the regulator output. (See Figure 3-1). Power supply voltage input. Not connected. Ground terminal. Inductor switch output. LX is the drain of an internal N-channel switching transistor. This terminal drives the external inductor, which ultimately provides current to the load.
--
1
SENSE
2
--
PS
-- 3 4 5
2 3 4 5
VDD NC GND LX
2002 Microchip Technology Inc.
DS21372B-page 3
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TC125/TC126
3.0 DETAILED DESCRIPTION
3.2
The TC125/126 are PFM step-up DC/DC regulators for use in systems operating from two or more cells or in low voltage, line powered applications. Because Pulse Frequency Modulation (PFM) is used, the TC125/126 switching frequency (and therefore supply current) is minimized at low output loads. This is especially important in battery operated applications (such as pagers) that operate in standby mode most of the time. For example, a TC125/126 with a 3V output and no load will consume a maximum supply current of only 10A versus a supply current of 40A maximum when IOUT = 30mA. Both devices require only an external inductor, diode and capacitor to implement a complete DC/DC converter. The TC125 is recommended for applications requiring shutdown mode as a means of reducing system supply current. The TC125 is powered from the PS input, which must be connected to the regulated output as shown in Figure 3-1. PS also senses output voltage for closed-loop regulation. Start-up current is furnished through the inductor when input voltage is initially applied. This action starts the oscillator, causing the voltage at the PS input to rise, bootstrapping the regulator into full operation. The TC126 (Figure 3-2) is recommended for all applications not requiring shutdown mode. It has separate VDD and SENSE inputs, allowing it to be powered from any source of 2.2V to 10V in the system. The VDD input of the TC126 may be connected to the VIN , VOUT, or an external DC voltage. Lower values of VDD result in lower supply current, but lower efficiency due to higher switch ON resistance. Higher V DD values increase supply current, but drive the internal switching transistor harder (lowering RDSON), thereby increasing efficiency.
Behavior When VIN is Greater Than the Factory-Programmed OUT Setting
The TC125 and TC126 are designed to operate as step-up regulators only. As such, VIN is assumed to always be less than the factory-programmed output voltage setting (VR). Operating the TC125/126 with VIN > VR causes regulating action to be suspended (and corresponding supply current reduction) until VIN is again less than VR. While regulating action is suspended, VIN is connected to the output voltage node through the series combination of the inductor and Schottky diode. Again, care must be taken to add the appropriate isolation (MOSFET series switch or post LDO with shutdown) during system design if this VIN / VOUT leakage path is problematic.
FIGURE 3-1:
L1 100H Sumida CD54
TYPICAL TC125 CIRCUIT
D1 MA735
1.5V 5 LX 4 GND
TC125
SHDN ON OFF 1 PS 2 NC 3 + C1 47F/16V Tantalum VOUT 3.3V @40mA
Shutdown Control
FIGURE 3-2:
3.3V Line Supply L1 100H Sumida CD54 4 LX
TYPICAL TC126 CIRCUIT
D1 MA735
3.1
Low Power Shutdown Mode
The TC125 enters a low power shutdown mode when SHDN is brought low. While in shutdown, the oscillator is disabled and the internal switch is shut off. Normal regulator operation resumes when SHDN is brought high. Because the TC125 uses an external diode, a leakage path between the input voltage and the output node (through the inductor and diode) exists while the regulator is in shutdown. Care must be taken in system design to assure the input supply is isolated from the load during shutdown.
5 GND
TC126
SENSE 1 VDD 2 NC 3 + C1 47F/16V Tantalum VOUT 5V @80mA
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DS21372B-page 4
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TC125/TC126
4.0
4.1
APPLICATIONS
Input Bypass Capacitors
4.4
Output Diode
Adding an input bypass capacitor reduces peak current transients drawn from the input supply and reduces the switching noise generated by the regulator. The source impedance of the input supply determines the size of the capacitor that should be used.
For best results, use a Schottky diode such as the MA735, 1N5817, MBR0520L or equivalent. Connect the diode between the PS and LX pins (TC125) or SENSE and LX pins (TC126) as close to the IC as possible. (Do not use ordinary rectifier diodes since the higher threshold voltages reduce efficiency.)
4.5
Output Capacitor
4.2
Inductor Selection
Selecting the proper inductor value is a trade-off between physical size and power conversion requirements. Lower value inductors cost less, but result in higher ripple current and core losses. They are also more prone to saturate since the coil current ramps to a higher value. Larger inductor values reduce both ripple current and core losses, but are larger in physical size and tend to increase the start-up time slightly. The recommended inductor value for use with the TC125/ 126 is 100H. Inductors with a ferrite core (or equivalent) are recommended. For highest efficiency, use an inductor with a series resistance less than 20m.
The effective series resistance of the output capacitor directly affects the amplitude of the output voltage ripple. (The product of the peak inductor current and the ESR determines output ripple amplitude.) Therefore, a capacitor with the lowest possible ESR should be selected. Smaller capacitors are acceptable for light loads or in applications where ripple is not a concern. The Sprague 595D series of tantalum capacitors are among the smallest of all low ESR surface mount capacitors available. Table 4-1 lists suggested components and suppliers.
4.6
Board Layout Guidelines
4.3
Internal Transistor Switch Current Limiting
The peak switch current is equal to the input voltage divided by the RDS ON of the internal switch. The internal transistor has absolute maximum current rating of 400mA with a design limit of 350mA. A built-in oscillator frequency doubling circuit guards against high switching currents. Should the voltage on the LX pin rise above 1.1V, max while the internal N-channel switch is ON, the oscillator frequency automatically doubles to minimize ON time. Although reduced, switch current still flows because the regulator remains in operation. Therefore, the LX input is not internally current limited and care must be taken never to exceed the 350mA maximum limit. Failure to observe this will result in damage to the regulator.
As with all inductive switching regulators, the TC125/ 126 generate fast switching waveforms that radiate noise. Interconnecting lead lengths should be minimized to keep stray capacitance, trace resistance, and radiated noise as low as possible. In addition, the GND pin, input bypass capacitor, and output filter capacitor ground leads should be connected to a single point. The input capacitor should be placed as close to power and ground pins of the TC125/126 as possible.
TABLE 4-1:
Type Surface Mount
SUGGESTED COMPONENTS AND SUPPLIERS
Inductors Sumida CD54 Series CDR125 Series Coiltronics CTX Series Murata LQN6C Series Capacitors Matsuo 267 Series Murata GRM200 Series Sprague 595D Series Nichicon F93 Series Sanyo OS-CON Series Nichicon PL Series ON Semiconductor 1N5817 - 1N5822 Diodes Nihon EC10 Series Matsushita MA735 Series
Through-Hole
Sumida RCH855 Series RCH110 Series Renco RL1284-12
2002 Microchip Technology Inc.
DS21372B-page 5
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TC125/TC126
5.0
Note:
TYPICAL CHARACTERISTICS
(Unless Otherwise Specified, All Parts Are Measured At Temperature = 25C) 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.
Output Voltage vs. Output Current TC125/126
3.5
Output Voltage vs. Output Current TC125/126
L = 100 F (Tantalum)
L = 100H, C = 47F (Tantalum)
OUTPUT VOLTAGE VOUT (V)
OUT (V)
3.0 2.5 2.0 1.5
1.0
1.8V 1.5V 1.2V V VIN = 0.9V V
6 5 4 3
2
3.0V
2.0V
0.5
0
1
0
VIN = 0.9V V
1.2V
1.5V
0
20
40
60
80
100
0
20
40
60
80
100
OUTPUT CURRENT IOUT (mA)
OUTPUT CURRENT IOUT (mA)
Efficiency vs. Output Current TC125/126
L = 100H, C = 47F (Tantalum) 100 100
Efficiency vs. Output Current TC125/126
L = 100 F (Tantalum) VIN = 3.0V
EFFICIENCY EFFI (%)
60 0.9V 40 1.2V 1.5V V
VIN = 1.8V
EFFICIENCY EFFI (%)
80
80 60 0.9V 40 1.2V 1.5V
2.0V
20 0
20 0
0
20
40
60
80
100
0
20
40
60
80
100
OUTPUT CURRENT IOUT (mA)
OUTPUT CURRENT IOUT (mA)
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DS21372B-page 6
2002 Microchip Technology Inc.
TC125/TC126
6.0
6.1
PACKAGING INFORMATION
Package Marking Information
3
represents first decimal of voltage Symbol (100kHz) 0 1 2 3 4 5 6 7 8 9 Voltage .0 .1 .2 .3 .4 .5 .6 .7 .8 .9
1
represents product classification; TC125 = L TC126 = N represents first integer of voltage
4
2
represents production lot ID code
Symbol (100kHz) 1 2 3 4 5 6 7
Voltage 1 2 3 4 5 6 7
2002 Microchip Technology Inc.
DS21372B-page 7
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TC125/TC126
6.2 Taping Form
Component Taping Orientation for 5-Pin SOT-23A (EIAJ SC-74A) Devices
User Direction of Feed
Device Marking
W
PIN 1
P Standard Reel Component Orientation TR Suffix Device (Mark Right Side Up)
Carrier Tape, Number of Components Per Reel and Reel Size
Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size
5-Pin SOT-23A
8 mm
4 mm
3000
7 in
6.3
Package Dimensions
SOT-23A-5
.075 (1.90) REF.
.122 (3.10) .098 (2.50) .020 (0.50) .012 (0.30) PIN 1 .122 (3.10) .106 (2.70) .057 (1.45) .035 (0.90) .006 (0.15) .000 (0.00)
.071 (1.80) .059 (1.50)
.037 (0.95) REF.
10 MAX. .024 (0.60) .004 (0.10)
.010 (0.25) .004 (0.09)
Dimensions: inches (mm)
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DS21372B-page 8
2002 Microchip Technology Inc.
TC125/TC126
Sales and Support
Data Sheets Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recommended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following: 1. 2. 3. Your local Microchip sales office The Microchip Corporate Literature Center U.S. FAX: (480) 792-7277 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.
DS21372B-page9
TC125/TC126
NOTES:
DS21372B-page10
2002 Microchip Technology Inc.
TC125/TC126
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 components in life support systems is not authorized except with express written approval by Microchip. No licenses are conveyed, 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 Technology 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, MXLAB, 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. (c) 2002, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved.
Printed on recycled paper.
Microchip received QS-9000 quality system certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona in July 1999 and Mountain View, California in March 2002. The Company's quality system processes and procedures are QS-9000 compliant for its PICmicro (R) 8-bit MCUs, KEELOQ(R) code hopping devices, Serial EEPROMs, microperipherals, non-volatile memory and analog products. In addition, Microchip's quality system for the design and manufacture of development systems is ISO 9001 certified.
2002 Microchip Technology Inc.
DS2372B-page 11
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DS21372B-page 12
2002 Microchip Technology Inc.

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