TC120503EHATR Microchip Technology, TC120503EHATR Datasheet

IC PWM/PFM REG/CONTRLR 5V SOP-8

TC120503EHATR

Manufacturer Part Number
TC120503EHATR
Description
IC PWM/PFM REG/CONTRLR 5V SOP-8
Manufacturer
Microchip Technology
Type
Step-Down (Buck)r
Datasheet

Specifications of TC120503EHATR

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
5V
Current - Output
600mA
Frequency - Switching
300kHz
Voltage - Input
1.8 ~ 10 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-SOP
Power - Output
300mW
Output Current
600 mA
Mounting Style
SMD/SMT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
©
Features
• Internal Switching Transistor Supports 600mA
• External Switching Transistor Control for Output
• 300kHz Oscillator Frequency Supports Small
• Short Circuit Protection
• Built-In Undervoltage Lockout
• 95% Typical Efficiency
• Automatic Switchover to Current-Saving PFM
• Automatic Output Capacitor Discharge While in
• 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
Functional Block Diagram
TC120503EHA
TC120333EHA
TC120303EHA
PWM/PFM Step-Down Combination Regulator/Controller
2002 Microchip Technology Inc.
Output Current
Currents of 2A+
Inductor Size
Mode at Low Output Loads
Shutdown
Number
Part
Voltage
Output
(V)
5.0
3.3
3.0
8-Pin SOP -40°C to +85°C
8-Pin SOP -40°C to +85°C
8-Pin SOP -40°C to +85°C
Package
V
IN
C
IN
C
4.7nF
SS
Operating
V
EXTW
CPC
SHDN/SS
Range
Temp.
IN
TC120XX03
SENSE
GND
EXT
L
X
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 (V
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 (V
mode by bringing the shutdown input (SHDN) low.
During shutdown, the regulator is disabled, supply
current is reduced to 2.5µA (max), and V
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.
SHDN/SS
D1
EXTW
OUT
L1
CPC
V
IN
= 3.3V) and can be placed in shutdown
1
2
4
3
C
8-Pin SOP
V
OUT
OUT
TC120
TC120
IN
= 5V, V
DS21365B-page 1
8
6
5
7
OUT
EXT
GND
SENSE
L
X
= 3.3V). An
OUT
is

Related parts for TC120503EHATR

TC120503EHATR Summary of contents

Page 1

... SOP -40°C to +85°C TC120303EHA 3.0 8-Pin SOP -40°C to +85°C Functional Block Diagram 2002 Microchip Technology Inc. © Package Type EXTW CPC SHDN/SS 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 line-powered applications ...

Page 2

... OUT = 5. – 0.4V); OUT EXT1 EXT2 (Note 2) OUT IN = 3.0V SHDN = V ; EXT1 and EXT2 OUT IH = 3.3V pulled up through a series OUT = 5.0V resistance of 200Ω voltage OUT such that VEXT1 0. 0.3V, IN OUT = 20mA (Note 3) OUT > 1 2002 Microchip Technology Inc. © ...

Page 3

... Short Circuit Protection PRO Response Time t Soft Start Time SS Note the factory-programmed output voltage setting external components connected, except C 3: While operating in PWM Mode. 2002 Microchip Technology Inc. © = 25° 1.2, Note 1 unless otherwise noted Min Typ Max Units 0.9 — 1.8 ...

Page 4

... Lx Inductor terminal. This pin is connected to the drain of the internal P-channel switching transistor. If the TC120 is operated as a regulator (i.e., using the internal switch); the inductor must be connected between this pin and the SENSE pin. DS21365B-page 4 Description 2002 Microchip Technology Inc. © ...

Page 5

... TC120. For highest efficiency, use inductors with a low DC resistance (less than 20mΩ). To minimize radiated noise, consider using a toroid, pot core or shielded-bobbin inductor. 2002 Microchip Technology Inc. © 3.2 Input Bypass Capacitor Using an input bypass capacitor reduces peak current transients drawn from the input supply, and reduces the switching noise generated by the regulator ...

Page 6

... TC120 as possible. The IN length of the EXT trace must also be kept as short as possible. when high and 26Ω 5V designed to OUT . The total gate charge specification IN MAX of 0.07Ω at 2A, with lead lengths should be 2002 Microchip Technology Inc. © = ...

Page 7

... TC120 WITH ADDED COMPONENTS FOR IMPROVED EFFICIENCY AT HIGH OUTPUT CURRENTS ≤ 2200 pF Ceramic EXTW TC120XX03 CPC D 1 IN5817 SHDN/SS ≤ For V IN 2002 Microchip Technology Inc. © Capacitors Diodes ON Semiconductor MBRS340T3 Nihon NSQ Series Matsushita MA737 IRC OAR Series V > 2200 pF Ceramic ...

Page 8

... Shutdown Not Used – with Pull-Up FIGURE 3-4: SOFT START TIMING Shutdown Signal SHDN/SS DS21365B-page 8 TC120XX03 V IN SHDN SHDN/SS ON OFF b) Using a Complementary Output Device C 4.7nF d) Shutdown Not Used – No Pull-Up ON OFF 0.65V X 0V 1.5msec TC120XX03 CMOS Gate R 1 SHDN/ TC120XX03 SHDN/SS SS 2002 Microchip Technology Inc. © ...

Page 9

... FIGURE 3-5: USING EXTERNAL TRANSISTOR SWITCH V IN EXTW CPC SHDN/ 4.7 nF FIGURE 3-6: EXTERNAL (EXT) AND EXTENDED EXTERNAL (EXTW) SWITCHING TRANSISTOR DRIVE OUTPUT EXT EXTW 100nsec 2002 Microchip Technology Inc. © EXT TC120XX03 GND SENSE TC120 C IN 47µF Tantalum L1 22µH ...

Page 10

... Standard Reel Component Orientation for TR Suffix Device Carrier Width (W) Pitch (P) Part Per Full Reel 1000 .256 (6.50) .232 (5.90) .069 (1.75) .055 (1.40) 8° MAX. .018 (0.45) .014 (0.35) W Reel Size 7 in .010 (0.25) .004 (0.10) Dimensions: inches (mm) 2002 Microchip Technology Inc. © ...

Page 11

... The Microchip Worldwide Site (www.microchip.com) Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using. New Customer Notification System Register on our web site (www.microchip.com/cn) to receive the most current information on our products.  2002 Microchip Technology Inc. TC120 DS21365B-page11 ...

Page 12

... TC120 NOTES: DS21365B-page12  2002 Microchip Technology Inc. ...

Page 13

... Serialized Quick Turn Programming (SQTP service mark of Microchip Technology Incorporated in the U.S.A. All other trademarks mentioned herein are property of their respective companies. © 2002, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved. Printed on recycled paper. Microchip received QS-9000 quality system ...

Page 14

... Korea Microchip Technology Korea 168-1, Youngbo Bldg. 3 Floor Samsung-Dong, Kangnam-Ku Seoul, Korea 135-882 Tel: 82-2-554-7200 Fax: 82-2-558-5934 Singapore Microchip Technology Singapore Pte Ltd. 200 Middle Road #07-02 Prime Centre Singapore, 188980 Tel: 65-6334-8870 Fax: 65-6334-8850 Taiwan Microchip Technology Taiwan 11F-3, No. 207 ...

Related keywords