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  Microchip Technology Semiconductor Electronic Components Datasheet  

TC110 Datasheet

PFM/PWM Step-Up DC/DC Controller

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TC110 pdf
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TC110
PFM/PWM Step-Up DC/DC Controller
Features
• Assured Start-up at 0.9V
• 50µA (Typ) Supply Current (fOSC = 100kHz)
• 300mA Output Current @ VIN 2.7V
• 0.5µA Shutdown Mode
• 100kHz and 300kHz Switching Frequency
Options
• Programmable Soft-Start
• 84% Typical Efficiency
• Small Package: 5-Pin SOT-23A
Applications
• Palmtops
• Battery-Operated Systems
• Positive LCD Bias Generators
• Portable Communicators
Device Selection Table
Part
Number
Output
Voltage
(V)*
Package
Osc.
Freq.
(kHz)
Operating
Temp.
Range
TC110501ECT 5.0 5-Pin SOT-23A 100 -40°C to +85°C
TC110331ECT 3.3 5-Pin SOT-23A 100 -40°C to +85°C
TC110301ECT 3.0 5-Pin SOT-23A 100 -40°C to +85°C
TC110503ECT 5.0 5-Pin SOT-23A 300 -40°C to +85°C
TC110333ECT 3.3 5-Pin SOT-23A 300 -40°C to +85°C
TC110303ECT 3.0 5-Pin SOT-23A 300 -40°C to +85°C
*Other output voltages are available. Please contact
Microchip Technology Inc. for details.
Package Type
5-Pin SOT-23A
EXT GND
54
General Description
The TC110 is a step-up (Boost) switching controller
that furnishes output currents of up to 300mA while
delivering a typical efficiency of 84%. The TC110
normally operates in pulse width modulation mode
(PWM), but automatically switches to pulse frequency
modulation (PFM) at low output loads for greater
efficiency. Supply current draw for the 100kHz version
is typically only 50µA, and is reduced to less than
0.5µA when the SHDN input is brought low. Regulator
operation is suspended during shutdown. The TC110
accepts input voltages from 2.0V to 10.0V, with a
guaranteed start-up voltage of 0.9V.
The TC110 is available in a small 5-Pin SOT-23A
package, occupies minimum board space and uses
small external components (the 300kHz version allows
for less than 5mm surface-mount magnetics).
Functional Block Diagram
+
Battery
3V
+
10µF
5
EXT
VOUT
1
4
GND
TC110
VDD SHDN/SS
23
47µH
D1
IN5817
Si9410DY
+
47µF
Tantalum
VOUT
R
C
OFF ON
3V to 5V Supply
*RC Optional
TC110
1
VOUT
23
VDD SHDN/SS
NOTE: 5-Pin SOT-23A is equivalent to the EIAJ SC-74A
© 2002 Microchip Technology Inc.
DS21355B-page 1


  Microchip Technology Semiconductor Electronic Components Datasheet  

TC110 Datasheet

PFM/PWM Step-Up DC/DC Controller

No Preview Available !

TC110 pdf
TC110
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings*
Voltage on VDD, VOUT, SHDN Pins ........ -0.3V to +12V
EXT Output Current ................................... ±100mA pk
Voltage on EXT Pin ........................-0.3V to VDD +0.3V
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.
TC110 ELECTRICAL SPECIFICATIONS
Electrical Characteristics: Note 1, VIN = 0.6 x VR, VDD = VOUT, TA = 25°C, unless otherwise noted.
Symbol
Parameter
Min Typ Max Units
Test Conditions
VDD
VSTART
VHOLD-UP
IDD
Operating Supply Voltage
Start-Up Supply Voltage
Oscillator Hold-Up Voltage
Boost Mode Supply Current
2.0
ISTBY
Standby Supply Current
ISHDN
Shutdown Supply Current
fOSC
Oscillator Frequency
255
85
VOUT
Output Voltage
VR
x 0.975
120
130
180
50
50
70
20
20
22
11
11
11
0.05
300
100
VR
10.0
0.9
0.7
190
200
280
90
100
120
34
35
38
20
20
22
0.5
345
115
VR
x 1.025
V Note 2
V IOUT = 1mA
V IOUT = 1mA
µA VOUT = SHDN = (0.95 x VR); fOSC = 300kHz; VR = 3.0V
VR = 3.3V
VR = 5.0V
fOSC = 100kHz; VR = 3.0V
VR = 3.3V
VR = 5.0V
µA VOUT = SHDN = (VR + 0.5V); fOSC = 300kHz; VR = 3.0V
VR = 3.3V
VR = 5.0V
fOSC = 100kHz; VR = 3.0V
VR = 3.3V
VR = 5.0V
µA SHDN = GND, VO = (VR x 0.95)
kHz VOUT = SHDN = (0.95 x VR); fOSC = 300kHz
fOSC = 100kHz
V Note 3
DTYMAX Maximum Duty Cycle
(PWM Mode)
— — 92 % VOUT = SHDN = 0.95 x VR
DTYPFM Duty Cycle (PFM Mode)
15 25 35 % IOUT = 0mA
VIH SHDN Input Logic High 0.65 — — V VOUT = (VR x 0.95)
VIL SHDN Input Logic Low
— — 0.20 V VOUT = (VR x 0.95)
REXTH EXT ON Resistance to VDD — 32 47 VOUT = SHDN = (VR x 0.95); VR = 3.0V
— 29 43
VR = 3.3V
— 20 29
VEXT = (VOUT – 0.4V)
VR = 5.0V
REXTL EXT ON Resistance to GND — 20 30 VOUT = SHDN = (VR x 0.95); VR = 3.0V
— 19 27
VR = 3.3V
— 13 19
VEXT = 0.4V
VR = 5.0V
η Efficiency
— 84 — %
Note
1: VR = 3.0V, IOUT = 120mA
VR = 3.3V, IOUT = 130mA
VR = 5.0V, IOUT = 200mA
2: See Application Notes “Operating Mode” description for clarification.
3: VR is the factory output voltage setting.
DS21355B-page 2
© 2002 Microchip Technology Inc.


Part Number TC110
Description PFM/PWM Step-Up DC/DC Controller
Maker Microchip Technology
Total Page 16 Pages
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