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TC120503EHA Datasheet(PDF) 1 Page - Microchip Technology

No. de pieza TC120503EHA
Descripción Electrónicos  PWM/PFM Step-Down Combination Regulator/Controller
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Fabricante Electrónico  MICROCHIP [Microchip Technology]
Página de inicio  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC120503EHA Datasheet(HTML) 1 Page - Microchip Technology

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 2001-2012 Microchip Technology Inc.
DS21365C-page 1
TC120
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
Package Type
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 55
A (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 2.5
A (max), and V
OUT 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
Part
Number
Output
Voltage
(V)
Package
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
1
2
3
4
8
7
6
5
TC120
8-Pin SOP
EXTW
CPC
SHDN/SS
VIN
GND
EXT
SENSE
LX
TC120XX03
VIN
EXTW
CPC
SHDN/SS
LX
EXT
GND
SENSE
CIN
D1
L1
VOUT
VIN
COUT
CSS
4.7nF
PWM/PFM Step-Down Combination Regulator/Controller


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