TC105333ECTTR Microchip Technology, TC105333ECTTR Datasheet

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TC105333ECTTR

Manufacturer Part Number
TC105333ECTTR
Description
IC,SMPS CONTROLLER,VOLTAGE-MODE,TSOP,5PIN,PLASTIC
Manufacturer
Microchip Technology
Type
Step-Down (Buck)r
Datasheet

Specifications of TC105333ECTTR

Rohs Compliant
YES
Internal Switch(s)
No
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
3.3V
Current - Output
1A
Frequency - Switching
300kHz
Voltage - Input
0.9 ~ 2.2 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
SOT-23-5, SC-74A, SOT-25
Power - Output
150mW
Output Current
1.0 A
Mounting Style
SMD/SMT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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©
Features
• 57µA (Typ) Supply Current
• 1A Output Current
• 0.5µA Shutdown Mode
• 300kHz Switching Frequency for Small Inductor
• Programmable Soft-Start
• 92% Typical Efficiency
• Small Package: 5-Pin SOT-23A
Applications
• Palmtops
• Battery-Operated Systems
• Portable Instruments
• Positive LCD Bias Generators
• Portable Communicators
• Hand-Held Scanners
• 5V to 3V Down Converters
Device Selection Table
*Other output voltages are available. Please contact
Microchip Technology Inc. for details.
Functional Block Diagram
TC105503ECT
TC105333ECT
TC105303ECT
2002 Microchip Technology Inc.
Size
Number
Part
Voltage
Output
(V)*
5.0
3.3
3.0
PFM/PWM Step-Down DC/DC Controller
5-Pin SOT-23A
5-Pin SOT-23A
5-Pin SOT-23A
Package
MA737
Si 9430
D
V
NiMH
1
BATT
Freq.
(kHz)
Osc.
6V
300 -40°C to +85°C
300 -40°C to +85°C
300 -40°C to +85°C
+
P
L
1
22µH (Sumida CD54)
Operating
Range
Temp.
V
EXT
5
1
OUT
TC105333ECT
3.3V Regulated Supply Using 6V
C
1
10µF/16V
NiMH Battery Pack Input
V
DD
2
SHDN
GND
4
3
Package Type
General Description
The TC105 is a step-down (Buck) switching controller
that furnishes output currents of up to 1A (max) while
delivering a typical efficiency of 92%. The TC105
normally operates in pulse width modulation mode
(PWM), but automatically switches to pulse frequency
modulation (PFM) at low output loads for greater
efficiency. Oscillator frequency is 300kHz, allowing use
of small (22µH) inductors. Supply current draw is only
102µA (max), and is reduced to less than 0.5µA when
the SHDN input is brought low. Regulator operation is
suspended during shutdown. The TC105 accepts a
maximum input voltage of 10V.
The TC105 is available in a small 5-Pin SOT-23A
package, occupies minimum board space and is ideal
for a wide range of applications.
R
C
0.033µF
SS
SS
NOTE: 5-Pin SOT-23A is equivalent to the EIAJ SC-74A
470K
OFF
(From System
Control Logic)
ON
5-Pin SOT-23A
V
C2
47µF
10V
Tantalum
EXT
OUT
5
1
3.3V
V
OUT
TC105
V
TC105
DD
2
SHDN
GND
4
3
DS21349B-page 1

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TC105333ECTTR Summary of contents

Page 1

... TC105333ECT 3.3 5-Pin SOT-23A 300 -40°C to +85°C TC105303ECT 3.0 5-Pin SOT-23A 300 -40°C to +85°C *Other output voltages are available. Please contact Microchip Technology Inc. for details. Functional Block Diagram D 1 MA737 Si 9430 V BATT 6V NiMH 2002 Microchip Technology Inc. ...

Page 2

... No external components; V — — OUT — 92 — % Test Conditions = 0V, SHDN = 3.0V, 3. 0V, SHDN = 5. 3.0V, 3. SHDN = 5. 0.3V OUT = 0mA = 0V, No external components = 0V, No external components = SHDN = – 0.4V) IN EXT 0V, SHDN = 0.4V IN EXT 2002 Microchip Technology Inc. © ...

Page 3

... The device resumes normal operation when SHDN is again brought high Voltage sense input. This input senses output voltage for regulation and must be connected to the OUT output voltage node as shown in the application schematic in this data sheet. 2002 Microchip Technology Inc. © TC105 Description DS21349B-page 3 ...

Page 4

... Schottky diodes such as the MA737 or 1N5817 through 1N5823 (and the equivalent surface mount versions) are recommended. Select a diode whose average current rating is greater than the peak inductor current and whose voltage rating is higher than MAX Table 4-1 lists suggested 2002 Microchip Technology Inc. © ...

Page 5

... -4.5V. Table 4-1 lists suppliers of external components recommended for use with the TC105. 2002 Microchip Technology Inc. © 3.8.1 BOARD LAYOUT GUIDELINES As with all inductive switching regulators, the TC105 generates fast switching waveforms, which radiate noise ...

Page 6

... TC105 Shutdown Not Used TC105 Shutdown Used OUT – PNP Bipolar Transistor SOFT START CIRCUIT R SS 470K 0.033µF – 4 SHDN/ 470K SHDN + OFF 0.033µF – 4 (From System Control Logic) SHDN/ OUT + – TC105 EXT 1 2002 Microchip Technology Inc. © ...

Page 7

... Series DO Series Miniature Sumida Sanyo Through-Hole RCH Series OS-CON Series Standard Coilcraft Nichicon Through-Hole PCH Series PL Series Coiltronics United Chemi-Con CTX Series LXF Series 2002 Microchip Technology Inc. © 22µH Sumida CD- 47µF MA737 10V Tantalum – SHDN/SS OUT R TC105 B ...

Page 8

... TC105 5.0 PACKAGING INFORMATION 5.1 Package Marking Information represents product classification; TC105 = M 1 represents first integer of voltage 2 Symbol (300kHz) Voltage DS21349B-page 8 represents first decimal of voltage 3 Symbol (300kHz represents production lot ID code Voltage . 2002 Microchip Technology Inc. © ...

Page 9

... PIN 1 .057 (1.45) .035 (0.90) .006 (0.15) .000 (0.00) 2002 Microchip Technology Inc. © User Direction of Feed P Standard Reel Component Orientation TR Suffix Device (Mark Right Side Up) Carrier Width (W) Pitch (P) Part Per Full Reel ...

Page 10

... TC105 NOTES: DS21349B-page 10 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. TC105 DS21349B-page11 ...

Page 12

... TC105 NOTES: DS21349B-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 ...

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