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PDF TC1263 Data sheet ( Hoja de datos )
| Número de pieza | TC1263 | |
| Descripción | 500mA Fixed Output CMOS LDO with Shutdown | |
| Fabricantes | Microchip Technology | |
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TC1263
500mA Fixed Output CMOS LDO with Shutdown
Features
• Very Low Dropout Voltage
• 500mA Output Current
• High Output Voltage Accuracy
• Standard or Custom Output Voltages
• Over Current and Over Temperature Protection
• SHDN Input for Active Power Management
• ERROR Output Can Be Used as a Low Battery
Detector (SOIC only)
Applications
• Battery Operated Systems
• Portable Computers
• Medical Instruments
• Instrumentation
• Cellular/GSM/PHS Phones
• Linear Post-Regulators for SMPS
• Pagers
Device Selection Table
Part Number
TC1263-xxVOA
TC1263-xxVAT
TC1263-xxVET
Package
8-Pin SOIC
5-Pin TO-220
5-Pin DDPAK
Junction
Temp. Range
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
NOTE: xx indicates output voltages.
Available Output Voltages: 2.5, 2.8, 3.0, 3.3, 5.0.
Other output voltages are available. Please contact Microchip
Technology Inc. for details.
Package Type
5-Pin DDPAK
FRONT VIEW
TAB IS GND
5-Pin TO-220
TAB IS GND
TC1263
TC1263
12 345
12345
8-Pin SOIC
VOUT 1
GND 2
NC 3
BYPASS 4
TC1263
8 VIN
7 NC
6 SHDN
5 ERROR
General Description
The TC1263 is a fixed output, high accuracy (typically
±0.5%) CMOS low dropout regulator. Designed
specifically for battery-operated systems, the TC1263’s
CMOS construction eliminates wasted ground current,
significantly extending battery life. Total supply current
is typically 80µA at full load (20 to 60 times lower than
in bipolar regulators).
TC1263 key features include ultra low noise operation,
very low dropout voltage (typically 350mV at full load),
and fast response to step changes in load.
The TC1263 incorporates both over temperature and
over current protection. The TC1263 is stable with an
output capacitor of only 1µF and has a maximum
output current of 500mA. It is available in 8-Pin SOIC,
5-Pin TO-220 and 5-Pin DDPAK packages.
Typical Application
VIN VIN
VOUT +
VOUT
TC1263
COUT
1µF
GND
SHDN
SHDN
© 2002 Microchip Technology Inc.
DS21374B-page 1
1 page  
4.0 THERMAL CONSIDERATIONS
4.1 Thermal Shutdown
Integrated thermal protection circuitry shuts the
regulator off when die temperature exceeds 160°C.
The regulator remains off until the die temperature
drops to approximately 150°C.
4.2 Power Dissipation
The amount of power the regulator dissipates is
primarily a function of input and output voltage, and
output current. The following equation is used to
calculate worst case actual power dissipation:
EQUATION 4-1:
PD ≈ (VINMAX – VOUTMIN)ILOADMAX
Where:
PD = Worst case actual power dissipation
VINMAX = Maximum voltage on VIN
VOUTMIN = Minimum regulator output voltage
ILOADMAX = Maximum output (load) current
The maximum allowable power dissipation (Equation
4-2) is a function of the maximum ambient temperature
(TAMAX), the maximum allowable die temperature
(TJMAX) and the thermal resistance from junction-to-air
(θJA).
EQUATION 4-2:
PDMAX = (TJMAX – TAMAX)
θJA
Where all terms are previously defined.
Table 4-1 and Table 4-2 show various values of θJA for
the TC1263 packages.
TABLE 4-1:
THERMAL RESISTANCE
GUIDELINES FOR TC1263 IN
8-PIN SOIC PACKAGE
Copper
Area
(Topside)*
Copper
Area
(Backside)
Board
Area
Thermal
Resistance
(θJA)
2500 sq mm 2500 sq mm 2500 sq mm 60°C/W
1000 sq mm 2500 sq mm 2500 sq mm 60°C/W
225 sq mm 2500 sq mm 2500 sq mm 68°C/W
100 sq mm 2500 sq mm 2500 sq mm 74°C/W
*Pin 2 is ground. Device is mounted on topside.
TC1263
TABLE 4-2:
THERMAL RESISTANCE
GUIDELINES FOR TC1263 IN
3-PIN TO-220/DDPAK
PACKAGE
Copper
Area
(Topside)*
Copper
Area
(Backside)
Board
Area
Thermal
Resistance
(θJA)
2500 sq mm 2500 sq mm 2500 sq mm 25°C/W
1000 sq mm 2500 sq mm 2500 sq mm 27°C/W
125 sq mm 2500 sq mm 2500 sq mm 35°C/W
*Tab of device attached to topside copper
Equation 4-1 can be used in conjunction with Equation
4-2 to ensure regulator thermal operation is within
limits. For example:
Given:
VINMAX = 3.3V ± 10%
VOUTMIN = 2.7V ± 0.5%
ILOADMAX = 275mA
TJMAX = 125°C
TAMAX = 95°C
θJA = 60°C/W
Find: 1. Actual power dissipation
2. Maximum allowable dissipation
Actual power dissipation:
PD ≈ (VINMAX – VOUTMIN)ILOADMAX
= [(3.3 x 1.1) – (2.7 x .995)]275 x 10–3
= 260mW
Maximum allowable power dissipation:
PDMAX = (TJMAX – TAMAX)
θJA
= (125 – 95)
60
= 500mW
In this example, the TC1263 dissipates a maximum of
260mW; below the allowable limit of 500mW. In a
similar manner, Equation 4-1 and Equation 4-2 can be
used to calculate maximum current and/or input
voltage limits. For example, the maximum allowable
VIN, is found by substituting the maximum allowable
power dissipation of 500mW into Equation 4-1, from
which VINMAX = 4.6V.
© 2002 Microchip Technology Inc.
DS21374B-page 5
5 Page 
TC1263
SALES AND SUPPORT
Data Sheets
Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recom-
mended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following:
1. Your local Microchip sales office
2. The Microchip Corporate Literature Center U.S. FAX: (480) 792-7277
3. 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.
DS21374B-page 11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet TC1263.PDF ] | |
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