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TC110503ECTTR

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
2002 Microchip Technology Inc. DS21355B-page 1
TC110
Features
• Assured Start-up at 0.9V
•50µA (Typ) Supply Current (f
OSC
= 100kHz)
• 300mA Output Current @ V
IN
≥ 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
*Other output voltages are available. Please contact
Microchip Technology Inc. for details.
Package Type
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
Part
Number
Output
Voltage
(V)*
Package
Osc.
Freq.
(kHz)
Operating
Temp.
Range
TC110501ECT 5.0 5-Pin SOT-23A 100 -40°Cto+85°C
TC110331ECT 3.3 5-Pin SOT-23A 100 -40°Cto+85°C
TC110301ECT 3.0 5-Pin SOT-23A 100 -40°Cto+85°C
TC110503ECT 5.0 5-Pin SOT-23A 300 -40°Cto+85°C
TC110333ECT 3.3 5-Pin SOT-23A 300 -40°Cto+85°C
TC110303ECT 3.0 5-Pin SOT-23A 300 -40°Cto+85°C
TC110
1 23
5
4
V
DD
EXT
GND
5-Pin SOT-23A
NOTE: 5-Pin SOT-23A is equivalent to the EIAJ SC-74A
V
OUT
SHDN/SS
5
4
TC110
1
3
2
3V to 5V Supply
SHDN/SS
V
DD
EXT GND
IN5817
D1
47µF
Tantalum
Si9410DY
47µH
10µF
Battery
3V
V
OUT
V
OUT
R
*RC Optional
C
ON
OFF
+
+
+
–
PFM/PWM Step-Up DC/DC Controller
TC110
DS21355B-page 2 2002 Microchip Technology Inc.
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings*
Voltage on V
DD
,V
OUT
, SHDN Pins ........-0.3V to +12V
EXT Output Current ...................................±100mA pk
Voltage on EXT Pin ........................-0.3V to V
DD
+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, V
IN
=0.6xV
R
,V
DD
=V
OUT
,T
A
=25°C, unless otherwise noted.
Symbol Parameter Min Typ Max Units Test Conditions
V
DD
Operating Supply Voltage 2.0 — 10.0 V Note 2
V
START
Start-Up Supply Voltage — — 0.9 V I
OUT
=1mA
V
HOLD-UP
Oscillator Hold-Up Voltage — — 0.7 V I
OUT
=1mA
I
DD
Boost Mode Supply Current —
—
—
—
—
—
120
130
180
50
50
70
190
200
280
90
100
120
µAV
OUT
= SHDN = (0.95 x V
R
); f
OSC
=300kHz;V
R
=3.0V
V
R
=3.3V
V
R
=5.0V
f
OSC
= 100kHz; V
R
=3.0V
V
R
=3.3V
V
R
=5.0V
I
STBY
Standby Supply Current —
—
—
—
—
—
20
20
22
11
11
11
34
35
38
20
20
22
µAV
OUT
= SHDN =(V
R
+0.5V);f
OSC
=300kHz;V
R
=3.0V
V
R
=3.3V
V
R
=5.0V
f
OSC
= 100kHz; V
R
=3.0V
V
R
=3.3V
V
R
=5.0V
I
SHDN Shutdown Supply Current — 0.05 0.5 µA SHDN =GND,V
O
=(V
R
x0.95)
f
OSC
Oscillator Frequency 255
85
300
100
345
115
kHz V
OUT
= SHDN = (0.95 x V
R
); f
OSC
=300kHz
f
OSC
= 100kHz
V
OUT
Output Voltage V
R
x0.975
V
R
V
R
x1.025
VNote3
DTYMAX Maximum Duty Cycle
(PWM Mode)
——92%V
OUT
= SHDN =0.95xV
R
DTYPFM Duty Cycle (PFM Mode) 15 25 35 % I
OUT
=0mA
V
IH
SHDN Input Logic High 0.65 — — V V
OUT
=(V
R
x0.95)
V
IL
SHDN Input Logic Low — — 0.20 V V
OUT
=(V
R
x0.95)
REXTH EXT ON Resistance to V
DD
—
—
—
32
29
20
47
43
29
Ω V
OUT
= SHDN =(V
R
x0.95);V
R
=3.0V
V
R
=3.3V
V
EXT
=(V
OUT
–0.4V) V
R
=5.0V
REXTL EXT ON Resistance to GND —
—
—
20
19
13
30
27
19
Ω V
OUT
= SHDN =(V
R
x0.95);V
R
=3.0V
V
R
=3.3V
V
EXT
=0.4V V
R
=5.0V
η Efficiency — 84 — %
Note 1: V
R
=3.0V,I
OUT
=120mA
V
R
=3.3V,I
OUT
=130mA
V
R
=5.0V,I
OUT
=200mA
2: See Application Notes “Operating Mode” description for clarification.
3: V
R
is the factory output voltage setting.
2002 Microchip Technology Inc. DS21355B-page 3
TC110
2.0 PIN DESCRIPTIONS
ThedescriptionsofthepinsarelistedinTable2-1.
TABLE 2-1: PIN FUNCTION TABLE
Pin No.
(5-Pin SOT-23A)
Symbol Description
1V
OUT
Internal device power and voltage sense input. This dual function input provides both feedback
voltage sensing and internal chip power. It should be connected to the regulator output. (See
Section 4.0, Applications).
2V
DD
Power supply voltage input.
3 SHDN
/SS Shutdown input. A logic low on this input suspends device operation and supply current is
reducedtolessthan0.5µA. The device resumes normal operation when SHDN
is again brought
high. An RC circuit connected to this input also determines the soft-start time.
4 GND Ground terminal.
5 EXT External switch transistor drive complimentary output. This pin drives the external switching
transistor. It may be connected to the base of the external bipolar transistor or gate of the external
N-channel MOSFET. (See Section 4.0, Applications).
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

TC110503ECTTR

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Manufacturer:
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Description:
Switching Controllers PFM/PWM Step-Up
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