http://www.www.datasheet4u.com

900,000+ Datasheet PDF Search and Download

Datasheet4U offers most rated semiconductors datasheets pdf




  Microchip Technology Semiconductor Electronic Components Datasheet  

TC120 Datasheet

PWM/PFM Step-Down Combination Regulator/Controller

No Preview Available !

TC120 pdf
TC120
PWM/PFM Step-Down Combination Regulator/Controller
Features
• Internal Switching Transistor Supports 600mA
Output Current
• External Switching Transistor Control for Output
Currents of 2A+
• 300kHz Oscillator Frequency Supports Small
Inductor Size
• Short Circuit Protection
• Built-In Undervoltage Lockout
• 95% Typical Efficiency
• Automatic Switchover to Current-Saving PFM
Mode at Low Output Loads
• Automatic Output Capacitor Discharge While in
Shutdown
• Programmable Soft-Start
• Power-Saving Shutdown Mode
• Small 8-Pin SOP Package
Applications
• Portable Test Equipment
• Local Logic Supplies
• Portable Audio Systems
• Portable Scanners
• Palmtops
• Electronic Organizers
Device Selection Table
Part
Number
Output
Voltage Package
(V)
Operating
Temp.
Range
TC120503EHA 5.0 8-Pin SOP -40°C to +85°C
TC120333EHA 3.3 8-Pin SOP -40°C to +85°C
TC120303EHA 3.0 8-Pin SOP -40°C to +85°C
Package Type
8-Pin SOP
VIN 1
EXTW 2
CPC 3
SHDN/SS 4
TC120
8 LX
7 EXT
6 GND
5 SENSE
General Description
TC120 is a 300kHz PFM/PWM step-down (Buck) DC/
DC regulator/controller combination for use in systems
operating from two or more cells, or in line-powered
applications. It uses PWM as the primary modulation
scheme, but automatically converts to PFM at low
output loads for greater efficiency. It requires only an
external inductor, Schottky diode, and two capacitors to
implement a step-down converter having a maximum
output current of 600mA (VIN = 5V, VOUT = 3.3V). An
external switching transistor (P-channel MOSFET) can
be added to increase output current capability to
support output loads of 2A or more.
The TC120 consumes only 55µA (max) of supply
current (VOUT = 3.3V) and can be placed in shutdown
mode by bringing the shutdown input (SHDN) low.
During shutdown, the regulator is disabled, supply
current is reduced to 2.5µA (max), and VOUT is
internally pulled to ground, discharging the output
capacitor. Normal operation resumes when SHDN is
brought high. Other features include a built-in under-
voltage lockout (UVLO), an externally programmable
soft start time, and output short circuit protection. The
TC120 operates from a maximum input voltage of 10V
and is available in a low-profile 8-Pin SOP package.
Functional Block Diagram
VIN
CIN
VIN LX
EXTW
EXT
TC120XX03
CPC
GND
L1
D1
VOUT
COUT
SHDN/SS
CSS
4.7nF
SENSE
© 2002 Microchip Technology Inc.
DS21365B-page 1


  Microchip Technology Semiconductor Electronic Components Datasheet  

TC120 Datasheet

PWM/PFM Step-Down Combination Regulator/Controller

No Preview Available !

TC120 pdf
TC120
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings*
Power Supply Voltage (VIN).................... -0.3V to +12V
Voltage on VOUT Pin ............................... -0.3V to +12V
Voltage on LX, Boost Pins
................................... (VIN – 12V) to (VIN + 0.3V)
Voltage on EXT1, EXT2, SHDN Pins
.......................................... (-0.3V) to (VIN + 0.3V)
LX Pin Current .............................................. 700mA pk
EXT1, EXT2 Pin Current ...................................±50mA
Continuous Power Dissipation .........................300mW
Operating Temperature Range............. -40°C to +85°C
Storage Temperature Range .............. -40°C to +150°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.
TC120 ELECTRICAL SPECIFICATIONS
Electrical Characteristics: Test circuit of Figure 3-1, TA = 25°C, VIN = VR x 1.2, Note 1 unless otherwise noted.
Symbol
Parameter
Min Typ Max Units
Test Conditions
VOUT Output Voltage
VR x 0.975 VR ± 0.5% VR x 1.025 V VOUT = 3.0V IOUT = 120mA (Note 1)
VOUT = 3.3V IOUT = 132mA
VOUT = 5.0V IOUT = 200mA
VIN Input Voltage
1.8 — 10.0 V
IOUTMAX Maximum Output Current
500
600
600
— mA VOUT = 3.0V
— VOUT = 3.3V
— VOUT = 5.0V
IIN Supply Current
— 52 82 µA VOUT = 3.0V VIN = VR x 1.05, no load
55 86
VOUT = 3.3V
71 110
VOUT = 5.0V
ISHDN Shutdown Supply Current
1.5
2.5 µA No load, SHDN = 0V, (Note 2)
ILX LX Pin Leakage Current
2 µA Measured at EXT1 Pin (Note 2)
— 1.5 2.5
No load, SHDN = 0V
RDSON(L LX Pin ON Resistance
X)
REXTH EXT1, EXT2
On Resistance to VIN
REXTL EXT1, EXT2
On Resistance to GND
0.69
0.94
VOUT = 3.0V VOUT = VR x 0.9 (Note 2)
0.64
0.85
VOUT = 3.3V VLX = VIN – 0.2V, 10
0.44
0.58
VOUT = 5.0V Resistor from LX to VIN,
SHDN = VIN
— 38 52 VOUT = 3.0V SHDN = VIH; EXT1 and EXT2
— 35 47
VOUT = 3.3V connected to 200load,
— 24 32
VOUT = 5.0V VEXT1 = VEXT2 = (VIN – 0.4V);
VOUT = VIN (Note 2)
— 31 41 VOUT = 3.0V SHDN = VIH; EXT1 and EXT2
— 29 37
VOUT = 3.3V pulled up through a series
— 20 26
VOUT = 5.0V resistance of 200to a voltage
such that VEXT1, 2 = 0.4V
fOSC Oscillator Frequency
255 300 345 kHz Measured at EXT1 Pin,
VIN = VOUT + 0.3V,
IOUT = 20mA (Note 3)
DPWM Maximum PWM Duty Cycle
— 100 %
DPFM PFM Duty Cycle
15 25 35 % No load
η
Note
Efficiency
— 95
1: VR is the factory-programmed output voltage setting.
2: No external components connected, except CSS.
3: While operating in PWM Mode.
— % VIN > VR x 1.2
DS21365B-page 2
© 2002 Microchip Technology Inc.


Part Number TC120
Description PWM/PFM Step-Down Combination Regulator/Controller
Maker Microchip Technology
Total Page 14 Pages
PDF Download
TC120 pdf
Download PDF File
TC120 pdf
View for Mobile






Related Datasheet

1 TC120 PWM/PFM Step-Down Combination Regulator/Controller Microchip Technology
Microchip Technology
TC120 pdf
2 TC1202A Display Module Winstar
Winstar
TC1202A pdf
3 TC1211 PWM controller with low-cost green energy technology for low EMI Zetex
Zetex
TC1211 pdf
4 TC1219 (TC1220) Switched Capacitor Voltage Converters with Shutdown in SOT Packages Microchip Technology
Microchip Technology
TC1219 pdf
5 TC122 TIRISTORI M&G Electronic
M&G Electronic
TC122 pdf
6 TC122 ARRAY CHIP RESISTORS Yageo
Yageo
TC122 pdf
7 TC122-20 thyristors (triacs) ETC
ETC
TC122-20 pdf
8 TC122-20 thyristors (triacs) ETC
ETC
TC122-20 pdf
9 TC122-25 thyristors (triacs) ETC
ETC
TC122-25 pdf




Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z

site map

webmaste! click here

contact us

Buy Components