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  Microchip Technology Semiconductor Electronic Components Datasheet  

TC125 Datasheet

(TC126) PFM Step-Up DC/DC Regulators

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TC125 pdf
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


  Microchip Technology Semiconductor Electronic Components Datasheet  

TC125 Datasheet

(TC126) PFM Step-Up DC/DC Regulators

No Preview Available !

TC125 pdf
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............. -40°C to +85°C
Storage Temperature Range .............. -40°C to +125°C
*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 = 25°C, SHDN = VOUT (TC125), unless otherwise noted.
Symbol
Parameter
Min
Typ
Max
Units
Test Conditions
VOUT
VDD
VSTART
IDD
INL
Output Voltage
Operating Supply Voltage
Start-Up Supply Voltage
Operating Supply Current
TC125
TC125/126
TC125/126
No Load Supply Current
ISTBY
Standby Supply Current
ISHDN Shutdown Supply Current
RLX(ON) LX Pin ON Resistance
VR – 2.5%
0.70
VR ± 0.5%
0.80
VR + 2.5%
10.0
0.90
— 14 28
— 20 40
— 32 64
—5
9
— 5 10
— 6 11
—2
—3
—3
4
5
5
— — 0.5
— 10 14
—6
8
—3
5
V
V
V
µA
µA
µA
µA
ILX LX Pin Leakage Current
——
1 µA
DCYCLE
fMAX
VLXLIM
η
Duty Cycle
Maximum Oscillator Frequency
LX Pin Limit Voltage
Efficiency
70 75 80 %
85 100 115 kHz
0.7 — 1.1 V
— 70 — %
— 80 —
— 85 —
VIH
VIL
IINH
IINL
Note
SHDN Input Logic High
0.75 —
—V
SHDN Input Logic Low
— — 0.20 V
SHDN Input Current (High)
0.25
µA
SHDN Pin Input Current (Low)
-0.25
µA
1: VR is the factory output voltage setting.
2: VIN = VOUT x 0.95.
3: VDD 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.
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
DS21372B-page 2
© 2002 Microchip Technology Inc.


Part Number TC125
Description (TC126) PFM Step-Up DC/DC Regulators
Maker Microchip Technology
Total Page 12 Pages
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