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TC125 데이터시트 PDF




Microchip Technology에서 제조한 전자 부품 TC125은 전자 산업 및 응용 분야에서
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부품번호 TC125 기능
기능 (TC126) PFM Step-Up DC/DC Regulators
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TC125 데이터시트, 핀배열, 회로
TC125/TC126
PFM Step-Up DC/DC Regulators
Features
• Assured Start-up at 0.9V
• PFM (100kHz Max Operating Frequency)
• 40µA Maximum Supply Current
(VOUT = 3V @ 30mA)
• 0.5µA Shutdown Mode (TC125)
• Voltage Sense Input (TC126)
• Requires Only Three External Components
• 80mA Maximum Output Current
• Small Package: 5-Pin SOT-23A
Applications
• Palmtops/PDAs
• Battery-Operated Systems
• Cameras
• Portable Communicators
Device Selection Table
Part
Number
Output
Voltage
(V)*
Package
Operating
Temp.
Range
TC125501ECT 5.0 5-Pin SOT-23A -40°C to +85°C
TC125331ECT 3.3 5-Pin SOT-23A -40°C to +85°C
TC125301ECT 3.0 5-Pin SOT-23A -40°C to +85°C
TC126503ECT 5.0 5-Pin SOT-23A -40°C to +85°C
TC126333ECT 3.3 5-Pin SOT-23A -40°C to +85°C
TC126303ECT 3.0 5-Pin SOT-23A -40°C to +85°C
*Other output voltages are available. Please contact
Microchip Technology Inc. for details.
Package Type
5-Pin SOT-23A
LX
GND
LX
GND
5 45 4
TC125
TC126
1
SHDN
2
PS
3
NC
12
SENSE VDD
3
NC
NOTE: 5-Pin SOT-23A is equivalent to the EIAJ SC-74A
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 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
than 5µA 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
0.5µA 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.
Typical Application
Sumida
100µH CD54
VIN
MA735
2 x "AA"
Cell
+
3V
54
LX GND
TC125
SHDN PS
12
NC
3
VOUT
5V @80mA
+
47µF/16V
Tantalum
Two Cell to 5V Boost Regulator
© 2002 Microchip Technology Inc.
DS21372B-page 1




TC125 pdf, 반도체, 판매, 대치품
TC125/TC126
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
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 appli-
cations 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 VDD values increase
supply current, but drive the internal switching
transistor harder (lowering RDSON), thereby increasing
efficiency.
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.
3.2 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:
TYPICAL TC125 CIRCUIT
L1
100µH Sumida CD54
D1
MA735
1.5V
ON OFF
Shutdown
Control
54
LX GND
TC125
SHDN PS
12
NC
3
VOUT
3.3V @40mA
+
C1
47µF/16V
Tantalum
FIGURE 3-2:
TYPICAL TC126 CIRCUIT
3.3V
Line
Supply
L1
100µH Sumida CD54
D1
MA735
45
LX GND
TC126
SENSE VDD NC
1 23
+
C1
47µF/16V
Tantalum
VOUT
5V @80mA
DS21372B-page 4
© 2002 Microchip Technology Inc.

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TC125 전자부품, 판매, 대치품
6.0 PACKAGING INFORMATION
6.1 Package Marking Information
1 represents product classification; TC125 = L
TC126 = N
2 represents first integer of voltage
Symbol
(100kHz)
1
2
3
4
5
6
7
Voltage
1
2
3
4
5
6
7
TC125/TC126
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
4 represents production lot ID code
© 2002 Microchip Technology Inc.
DS21372B-page 7

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