TC125 [MICROCHIP]
PFM Step-Up DC/DC Regulators; PFM升压型DC / DC稳压器
| 型号： | TC125 |
| 厂家： | 
MICROCHIP |
| 描述： | PFM Step-Up DC/DC Regulators |
| 文件： | 总12页 (文件大小：461K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TC125/TC126
PFM Step-Up DC/DC Regulators
Features
General Description
• Assured Start-up at 0.9V
The TC125/126 step-up (Boost) switching regulators
furnish output currents to
a maximum of 80mA
• PFM (100kHz Max Operating Frequency)
• 40µA Maximum Supply Current
(V = 2V, V = 3V) with typical efficiencies above
IN
OUT
80%. These devices employ pulse frequency modula-
tion (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 70µA at full output load, and less
(V
= 3V @ 30mA)
OUT
• 0.5µA Shutdown Mode (TC125)
• Voltage Sense Input (TC126)
• Requires Only Three External Components
• 80mA Maximum Output Current
• Small Package: 5-Pin SOT-23A
than 5µA in standby (V
= 3V). Both devices require
OUT
only an external inductor, diode, and capacitor to
implement a complete DC/DC regulator.
Applications
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
0.5µA when the shutdown control input (SHDN) is low.
• Palmtops/PDAs
• Battery-Operated Systems
• Cameras
• Portable Communicators
Device Selection Table
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.
Output
Voltage
(V)*
Operating
Temp.
Range
Part
Number
Package
TC125501ECT
TC125331ECT
TC125301ECT
TC126503ECT
TC126333ECT
TC126303ECT
5.0
3.3
3.0
5.0
3.3
3.0
5-Pin SOT-23A -40°C to +85°C
5-Pin SOT-23A -40°C to +85°C
5-Pin SOT-23A -40°C to +85°C
5-Pin SOT-23A -40°C to +85°C
5-Pin SOT-23A -40°C to +85°C
5-Pin SOT-23A -40°C to +85°C
Typical Application
Sumida
100µH CD54
V
OUT
MA735
5V @80mA
V
IN
+
47µF/16V
Tantalum
*Other output voltages are available. Please contact
Microchip Technology Inc. for details.
5
4
–
GND
LX
+
2 x "AA"
Cell
3V
TC125
Package Type
SHDN PS
NC
3
5-Pin SOT-23A
2
1
LX
5
GND
4
LX
5
GND
4
Two Cell to 5V Boost Regulator
TC126
TC125
1
2
3
1
2
3
V
SENSE
NC
SHDN
PS
NC
DD
NOTE: 5-Pin SOT-23A is equivalent to the EIAJ SC-74A
2002 Microchip Technology Inc.
DS21372B-page 1
TC125/TC126
*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*
Voltage on V , SENSE/V , LX, SHDN Pins
DD
DD
....................................................... -0.3V to +12V
LX Sink Current............................................ 400mA pk
Power Dissipation.............................................150mW
Operating Temperature Range.............-40°C to +85°C
Storage Temperature Range ..............-40°C to +125°C
TC125/TC126 ELECTRICAL SPECIFICATIONS
Electrical Characteristics: VIN = VOUT x 0.6, TA = 25°C, SHDN = VOUT (TC125), unless otherwise noted.
Symbol
Parameter
Output Voltage
Min
Typ
Max
Units
Test Conditions
VOUT
VDD
VR – 2.5% VR ± 0.5% VR + 2.5%
V
V
V
Operating Supply Voltage
Start-Up Supply Voltage
0.70
—
—
10.0
0.90
Note 4
IOUT = 1mA
VSTART
IDD
0.80
Operating Supply Current
TC125
TC125/126
µA (Note 2)
—
—
—
14
20
32
28
40
64
V
V
V
OUT = 2V, IOUT = 10mA
OUT = 3V, IOUT = 30mA
OUT = 5V, IOUT = 50mA
TC125/126
INL
No Load Supply Current
Standby Supply Current
Shutdown Supply Current
—
—
—
5
5
6
9
10
11
µA
IOUT = 0, VOUT = 2V
V
V
OUT = 3V
OUT = 5V
ISTBY
—
—
—
2
3
3
4
5
5
µA VIN = VOUT + 0.5V, VIN = 2V
VIN = 3V
VIN = 5V
ISHDN
—
—
0.5
µA SHDN = VIL, (Note 2)
RLX(ON) LX Pin ON Resistance
—
—
—
10
6
3
14
8
5
Ω
VLX = 0.4V, VOUT = 2V
VOUT = 3V
OUT = 5V
V
(Note 2), (Note 3)
µA No external components,
OUT = VLX = 10V
Measured at LX pin (Note 2)
kHz Note 2
ILX
LX Pin Leakage Current
—
—
1
V
DCYCLE
fMAX
Duty Cycle
70
85
75
100
—
80
115
1.1
%
Maximum Oscillator Frequency
LX Pin Limit Voltage
Efficiency
VLXLIM
η
0.7
V
Note 2
—
—
—
70
80
85
—
—
—
%
VOUT = 2V
VOUT = 3V
VOUT = 5V
VIH
VIL
SHDN Input Logic High
0.75
—
—
—
—
—
—
0.20
0.25
—
V
V
SHDN Input Logic Low
IINH
IINL
SHDN Input Current (High)
SHDN Pin Input Current (Low)
—
µA
µA
-0.25
Note 1: VR is the factory output voltage setting.
2:
3:
V
V
IN = VOUT x 0.95.
DD input tied to SENSE input for TC126, as shown in Figure 3-2.
4: 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.
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:
PIN FUNCTION TABLE
TC125
TC126
Pin No.
Pin No.
Symbol
Description
(5-Pin SOT-23A) (5-Pin SOT-23A)
1
—
SHDN
Shutdown input. A logic low on this input suspends device operation and
supply current is reduced to less than 0.5µA. The device resumes normal
operation when SHDN is again brought high.
—
1
SENSE
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.
2
—
PS
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).
—
3
2
3
4
5
VDD
NC
Power supply voltage input.
Not connected.
4
GND
LX
Ground terminal.
5
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.
2002 Microchip Technology Inc.
DS21372B-page 3
TC125/TC126
3.2
Behavior When VIN is Greater
Than the Factory-Programmed
OUT Setting
3.0
DETAILED DESCRIPTION
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
10µA versus a supply current of 40µA maximum when
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
V
IN > 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/
IOUT = 30mA. Both devices require only an external
inductor, diode and capacitor to implement a complete
DC/DC converter.
V
OUT leakage path is problematic.
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.
FIGURE 3-1:
TYPICAL TC125 CIRCUIT
L1
D1
MA735
100µH Sumida CD54
1.5V
5
4
GND
LX
TC125
The TC126 (Figure 3-2) is recommended for all appli-
cations not requiring shutdown mode. It has separate
SHDN PS
NC
3
V
OUT
3.3V @40mA
ON OFF
2
1
V
DD and SENSE inputs, allowing it to be powered from
Shutdown
Control
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 VDD values increase
supply current, but drive the internal switching
transistor harder (lowering RDSON), thereby increasing
efficiency.
+
C
1
47µF/16V
Tantalum
FIGURE 3-2:
TYPICAL TC126 CIRCUIT
3.3V
Line
Supply
D1
MA735
L1
100µH Sumida CD54
3.1
Low Power Shutdown Mode
4
5
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.
LX
GND
TC126
SENSE
1
V
DD
NC
3
2
V
OUT
5V @80mA
+
C
1
47µF/16V
Tantalum
DS21372B-page 4
2002 Microchip Technology Inc.
TC125/TC126
4.4
Output Diode
4.0
4.1
APPLICATIONS
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.)
Input Bypass Capacitors
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.
4.5
Output Capacitor
4.2
Inductor Selection
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.) There-
fore, 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.
Selecting the proper inductor value is a trade-off
between physical size and power conversion require-
ments. 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 100µH. Inductors with a ferrite core (or equiva-
lent) are recommended. For highest efficiency, use an
inductor with a series resistance less than 20mΩ.
4.6
Board Layout Guidelines
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.
4.3
Internal Transistor Switch Current
Limiting
The peak switch current is equal to the input voltage
divided by the RDS of the internal switch. The
ON
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.
TABLE 4-1:
Type
SUGGESTED COMPONENTS AND SUPPLIERS
Inductors Capacitors
Diodes
Surface Mount
Sumida
Matsuo
Nihon
CD54 Series
267 Series
EC10 Series
CDR125 Series
Murata
Matsushita
Coiltronics
CTX Series
GRM200 Series
MA735 Series
Sprague
Murata
595D Series
LQN6C Series
Nichicon
F93 Series
Through-Hole
Sumida
RCH855 Series
RCH110 Series
Sanyo
OS-CON Series
ON Semiconductor
1N5817 - 1N5822
Nichicon
Renco
PL Series
RL1284-12
2002 Microchip Technology Inc.
DS21372B-page 5
TC125/TC126
5.0
TYPICAL CHARACTERISTICS
(Unless Otherwise Specified, All Parts Are Measured At Temperature = 25°C)
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.
Output Voltage vs. Output Current
TC125/126
Output Voltage vs. Output Current
TC125/126
L = 100µH, C = 47µF (Tantalum)
L = 100µ
µF (Tantalum)
3.5
1.8V
3.0
6
3.0V
2.0V
2.5
2.0
5
4
1.5V
1.2V
V
= 0.9V
IN
1.5
1.0
3
2
1.5V
1.2V
V
= 0.9V
20
IN
0.5
0
1
0
0
20
40
60
OUT
80
(mA)
100
0
40
60
80
100
OUTPUT CURRENT I
OUTPUT CURRENT I
OUT
(mA)
Efficiency vs. Output Current
TC125/126
Efficiency vs. Output Current
TC125/126
L = 100µ
µF (Tantalum)
L = 100µH, C = 47µF (Tantalum)
100
100
V
= 3.0V
IN
80
60
80
60
V
= 1.8V
IN
2.0V
0.9V
1.2V 1.5V
1.5V
0.9V
1.2V
40
40
20
0
20
0
0
20
40
60
80
100
0
20
40
60
OUT
80
(mA)
100
OUTPUT CURRENT I
OUTPUT CURRENT I
(mA)
OUT
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)
Voltage
0
1
2
3
4
5
6
7
8
9
.0
.1
.2
.3
.4
.5
.6
.7
.8
.9
1
2
represents product classification; TC125 = L
TC126 = N
represents first integer of voltage
4
represents production lot ID code
Symbol
Voltage
(100kHz)
1
2
3
4
5
6
7
1
2
3
4
5
6
7
2002 Microchip Technology Inc.
DS21372B-page 7
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.
.071 (1.80)
.059 (1.50)
.122 (3.10)
.098 (2.50)
.020 (0.50)
.012 (0.30)
PIN 1
.037 (0.95)
REF.
.122 (3.10)
.106 (2.70)
.057 (1.45)
.035 (0.90)
.010 (0.25)
.004 (0.09)
10° MAX.
.006 (0.15)
.000 (0.00)
.024 (0.60)
.004 (0.10)
Dimensions: inches (mm)
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 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.
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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 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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2002 Microchip Technology Inc.
DS2372B-page 11
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Batiment A - ler Etage
91300 Massy, France
Tel: 33-1-69-53-63-20 Fax: 33-1-69-30-90-79
Germany
Microchip Technology GmbH
Gustav-Heinemann Ring 125
D-81739 Munich, Germany
Tel: 49-89-627-144 0 Fax: 49-89-627-144-44
18201 Von Karman, Suite 1090
Irvine, CA 92612
Tel: 949-263-1888 Fax: 949-263-1338
China - Shenzhen
Microchip Technology Consulting (Shanghai)
Co., Ltd., Shenzhen Liaison Office
Rm. 1315, 13/F, Shenzhen Kerry Centre,
Renminnan Lu
Shenzhen 518001, China
Tel: 86-755-2350361 Fax: 86-755-2366086
New York
150 Motor Parkway, Suite 202
Hauppauge, NY 11788
Tel: 631-273-5305 Fax: 631-273-5335
San Jose
Microchip Technology Inc.
2107 North First Street, Suite 590
San Jose, CA 95131
Tel: 408-436-7950 Fax: 408-436-7955
Toronto
China - Hong Kong SAR
Italy
Microchip Technology Hongkong Ltd.
Unit 901-6, Tower 2, Metroplaza
223 Hing Fong Road
Kwai Fong, N.T., Hong Kong
Tel: 852-2401-1200 Fax: 852-2401-3431
Microchip Technology SRL
Centro Direzionale Colleoni
Palazzo Taurus 1 V. Le Colleoni 1
20041 Agrate Brianza
Milan, Italy
6285 Northam Drive, Suite 108
Mississauga, Ontario L4V 1X5, Canada
Tel: 905-673-0699 Fax: 905-673-6509
India
Tel: 39-039-65791-1 Fax: 39-039-6899883
Microchip Technology Inc.
India Liaison Office
United Kingdom
Microchip Ltd.
505 Eskdale Road
Winnersh Triangle
Wokingham
Berkshire, England RG41 5TU
Tel: 44 118 921 5869 Fax: 44-118 921-5820
Divyasree Chambers
1 Floor, Wing A (A3/A4)
No. 11, O’Shaugnessey Road
Bangalore, 560 025, India
Tel: 91-80-2290061 Fax: 91-80-2290062
05/01/02
DS21372B-page 12
2002 Microchip Technology Inc.
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