TC125/TC126
PFM Step-Up DC/DC Regulators
Features
鈥?Assured Start-up at 0.9V
鈥?PFM (100kHz Max Operating Frequency)
鈥?40碌A(chǔ) Maximum Supply Current
(V
OUT
= 3V @ 30mA)
鈥?0.5碌A(chǔ) Shutdown Mode (TC125)
鈥?Voltage Sense Input (TC126)
鈥?Requires Only Three External Components
鈥?80mA Maximum Output Current
鈥?Small Package: 5-Pin SOT-23A
General Description
The TC125/126 step-up (Boost) switching regulators
furnish output currents to a maximum of 80mA
(V
IN
= 2V, V
OUT
= 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 70碌A(chǔ) at full output load, and less
than 5碌A(chǔ) in standby (V
OUT
= 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
0.5碌A(chǔ) 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
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
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
-40擄C to +85擄C
-40擄C to +85擄C
-40擄C to +85擄C
-40擄C to +85擄C
-40擄C to +85擄C
-40擄C to +85擄C
Typical Application
Sumida
100碌H CD54
V
IN
+
MA735
V
OUT
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
鈥?/div>
47碌F/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
V
DD
3
NC
SENSE
NOTE:
5-Pin SOT-23A is equivalent to the EIAJ SC-74A
2002 Microchip Technology Inc.
DS21372B-page 1
漏
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