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TC125 Datasheet, PDF (2/12 Pages) Microchip Technology – PFM Step-Up DC/DC Regulators
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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............. -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% VR ± 0.5% VR + 2.5% V
0.70
—
10.0
V
—
0.80
0.90
V
µA
—
14
28
—
20
40
—
32
64
—
5
9
µA
—
5
10
—
6
11
—
2
—
3
—
3
4
µA
5
5
—
—
0.5
µA
—
10
14
Ω
—
6
8
—
3
5
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.
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