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  Microchip Technology Semiconductor Electronic Components Datasheet  

TC115 Datasheet

PFM/PWM Step-Up DC/DC Converter

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TC115 pdf
TC115
PFM/PWM Step-Up DC/DC Converter
Features
• High Efficiency at Low Output Load Currents via
PFM Mode
• Assured Start-up at 0.9V
• 80µA (Typ) Supply Current
• 85% Typical Efficiency at 100mA
• 140mA Typical Output Current @ VIN = 2.0V
• Low Power Shutdown Mode
• No External Switching Transistor Needed
• Space Saving SOT-89 Package
Applications
• Pagers
• Cellular Phones
• Palmtops
• 1-Cell to 3-Cell Battery Powered Systems
• Cameras, Video Recorders
• Local +3V to +5V Supplies
Device Selection Table
Part
Number
Output
Osc.
Voltage Package Freq.
(V)* (kHz)
Operating
Temp.
Range
TC115501ECT 5.0 SOT-89-5 100 -40°C to +85°C
TC115331ECT 3.3 SOT-89-5 100 -40°C to +85°C
TC115301ECT 3.0 SOT-89-5 100 -40°C to +85°C
*Other output voltages are available. Please contact
Microchip Technology for details.
Package Type
SOT-89-5
5
GND
NC
1
4
LX
TC115
PS SHDN
23
General Description
The TC115 is a high-efficiency step-up DC/DC
converter for small, low input voltage or battery
powered systems. This device has a start-up voltage of
0.9V and a typical supply current of 80µA. Phase
compensation and soft-start circuitry are included on-
chip. Unlike conventional PWM step-up converters, the
TC115 automatically shifts to pulse frequency
modulation (PFM) at low loads, resulting in reduced
supply current and improved efficiency.
The TC115 requires only an external diode, an
inductor, and a capacitor, and supports typical output
currents of 140mA. Supply current is reduced to less
than 0.5µA, max when SHDN input is brought low.
Small size, low installed cost, and low supply current
make the TC115 step-up converter ideal for use in a
wide range of battery powered systems.
Functional Block Diagram
+
1.5V
+
C1
10µF
L1
100µH
Sumida
CD-54
D1
5
GND
NC
1
IN5817 +
C2
4 47µF
Tantalum
LX
TC115
PS SHDN
23
+3V
OUT
1.5V to +3V, 50mA Supply
© 2002 Microchip Technology Inc.
DS21361B-page 1


  Microchip Technology Semiconductor Electronic Components Datasheet  

TC115 Datasheet

PFM/PWM Step-Up DC/DC Converter

No Preview Available !

TC115 pdf
TC115
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings*
Power Supply Voltage (PS) .................................... 12V
Power Dissipation.............................................500mW
LX Sink Current ............................................ 400mA pk
SHDN Input Voltage ............................................... 12V
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.
TC115 ELECTRICAL SPECIFICATIONS
Electrical Characteristics: VOUT = 5V, TA = 25°C, unless otherwise noted. Circuit configuration per Figure 4-1.
Symbol
Parameter
Min Typ Max Units
Test Conditions
VIN
Operating Supply Voltage
0.9
— 10.0 V Note 5
VSTART Start-Up Supply Voltage
— — 0.9 V IOUT = 1mA
ILXMAX
LX Maximum Sink Current
— 350 mA
fLIM LX Limit Frequency
— 200 — kHz VLX = VLXLIM
VLXLIM LX Limit Voltage
0.7 — 1.3 V Note 2
IDD No Load Supply Current — 13 26 µA IOUT = 0, VIN = VOUT x 0.8 (Note3)
ICC
Boost Mode Supply Current —
80 135 µA No external components,
VIN = (0.95 x VOUT) applied to PS (or VDD) input
ISTBY
Standby Supply Current
9 17 µA No external components,
VIN = (1.1 x VOUT) applied to PS (or VDD) input
ISD
Shutdown Supply Current
0.5 µA SHDN = 0V
fOSC
Oscillator Frequency
85 100 115 kHz Note 2, Note 4
VOUT
Output Voltage
VR x 0.975 VR VR x 1.025 V VIN = 2.2V minimum (Note 1)
RSWON LX Output ON Resistance
1.4 2.4
VLX = 0.4V
PFMDUTY Duty Cycle
10 17 25 % No external components.
(PFM Operating Mode)
MAXDUTY Maximum Duty Cycle
80 87 92 % Note 4
tSS Soft Start Time
η Efficiency
4 10 20 msec
— 85 — %
VIH
VIL
Note
SHDN Input Logic High 0.75 — — V
SHDN Input Logic Low
— — 0.20 V
1: VR is the nominal factory-programmed output voltage setting.
2: VLXLIM is the voltage on the LX pin (with internal switch ON) that will cause the oscillator to run at twice nominal frequency in to limit the
switch current through the internal N-channel switching transistor.
3: Measured with D1 = MA735 (reverse current < 1µA at a reverse voltage of 10V).
4: With TC115 operating in PWM mode.
5: See Section 3.4 “Behavior When VIN is Greater Than the Factory-Programmed VOUT Setting”.
DS21361B-page 2
© 2002 Microchip Technology Inc.


Part Number TC115
Description PFM/PWM Step-Up DC/DC Converter
Maker Microchip
Total Page 14 Pages
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