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PDF TC2054 Data sheet ( Hoja de datos )
| Número de pieza | TC2054 | |
| Descripción | 50mA / 100mA / and 150mA CMOS LDOs with Shutdown and Error Output | |
| Fabricantes | Microchip Technology | |
| Logotipo |  |
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TC2054/2055/2186
50mA, 100mA, and 150mA CMOS LDOs
with Shutdown and Error Output
Features
• Very Low Supply Current (55µA Typ.) for Longer
Battery Life
• Very Low Dropout Voltage: 140mV (Typ.) @
150mA
• High Output Voltage Accuracy: ±0.4% (Typ)
• Standard or Custom Output Voltages
• Power-Saving Shutdown Mode
• ERROR Output Can Be Used as a Low Battery
Detector or Processor Reset Generator
• Fast Shutdown Reponse Time: 60µsec (Typ)
• Over-Current Protection
• Space-Saving 5-Pin SOT-23A Package
• Pin Compatible Upgrades for Bipolar Regulators
Applications
• Battery Operated Systems
• Portable Computers
• Medical Instruments
• Instrumentation
• Cellular / GSMS / PHS Phones
• Pagers
Device Selection Table
Part Number
Package
Junction Temp.
Range
TC2054-xxVCT 5-Pin SOT-23A* -40°C to +125°C
TC2055-xxVCT 5-Pin SOT-23A* -40°C to +125°C
TC2186-xxVCT 5-Pin SOT-23A* -40°C to +125°C
Note: *5-Pin SOT-23A is equivalent to EIAJ (SC-74A).
Package Type
VOUT
ERROR
54
TC2054
TC2055
TC2186
12 3
5-Pin SOT-23A*
VIN GND SHDN TOP VIEW
General Description
The TC2054, TC2055 and TC2186 are high accuracy
(typically ±0.4%) CMOS upgrades for older (bipolar)
low dropout regulators. Designed specifically for bat-
tery-operated systems, the devices’ total supply current
is typically 55µA at full load (20 to 60 times lower than
in bipolar regulators).
The devices’ key features include ultra low noise oper-
ation, very low dropout voltage - typically 45mV
(TC2054); 90mV (TC2055); and 140mV (TC2186) at
full load - and fast response to step changes in load. An
error output (ERROR) is asserted when the devices are
out-of-regulation (due to a low input voltage or exces-
sive output current). Supply current is reduced to 0.5µA
(max) and both VOUT and ERROR are disabled when
the shutdown input is low. The devices also incorporate
over-current protection.
The TC2054, TC2055 and TC2186 are stable with a
low esr ceramic output capacitor of 1µF and have a
maximum output current of 50mA, 100mA and 150mA,
respectively. This LDO Family also features a fast
response time (60µsec typically) when released from
shutdown.
Typical Application
VIN 1 VIN
1µF
VOUT 5
VOUT
1µF
2
GND
TC2054
TC2055
TC2186
1M
3
SHDN
Shutdown Control
(from Power Control Logic)
4
ERROR
ERROR
© 2002 Microchip Technology Inc.
DS21663B-page 1
1 page  
4.0 THERMAL CONSIDERATIONS
4.1 Power Dissipation
The amount of power the regulator dissipates is prima-
rily a function of input and output voltage, and output
current.
The following equation is used to calculate worst case
power dissipation:
EQUATION 4-1:
PD ≈ (VIN – VOUTMIN)ILOADMAX
Where:
PD
VINMAX
VOUTMIN
ILOADMAX
=
=
=
=
Worst case actual power dissipation
Maximum voltage on VIN
Minimum regulator output voltage
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 (125
°C) and the thermal resistance from junction-to-air
(θJA). The 5-Pin SOT-23A package has a θJA of
approximately 220°C/Watt when mounted on a typical
two layer FR4 dielectric copper clad PC board.
EQUATION 4-2:
PDMAX
=
T----J---M---A--X----–-----T----A---M---A--X-
θJA
Where all terms are previously defined
TC2054/2055/2186
Equation 4-1 can be used in conjunction with Equation
4-2 to ensure regulator thermal operation is within lim-
its. For example:
Given:
VINMAX = 3.0V ±5%
VOUTMIN = 2.7V – 2.5%
ILOADMAX = 40mA
TAMAX = 55°C
Find 1. Actual power dissapation
:
2. Maximum allowable dissapation
Actual power dissipation:
PD ≈ (VINMAX – VOUTMIN)ILOADMAX
= [(3.0 x 1.05) – (2.7 x .975)]40 x 10–3
= 20.7mW
Maximum allowable power dissipation:
PDMAX
=
(---T---J---M---A--X----–----T----A---M---A--X--)-
θJA
(---1---2---5-----–-----5---5----)
220
= 318mW
In this example, the TC2054 dissipates a maximum of
only 20.7mW; far below the allowable limit of 318mW.
In a similar manner, Equation 4-1 and Equation 4-2 can
be used to calculate maximum current and/or input
voltage limits.
4.2 Layout Considerations
The primary path of heat conduction out of the package
is via the package leads. Therefore, layouts having a
ground plane, wide traces at the pads, and wide power
supply bus lines combine to lower θJA and, therefore,
increase the maximum allowable power dissipation
limit.
© 2002 Microchip Technology Inc.
DS21663B-page 5
5 Page 
6.3 Package Dimensions
SOT-23A-5
.075 (1.90)
REF.
TC2054/2055/2186
.122 (3.10)
.098 (2.50)
.071 (1.80)
.059 (1.50)
.020 (0.50)
.012 (0.30)
PIN 1
.037 (0.95)
REF.
.122 (3.10)
.106 (2.70)
.057 (1.45)
.035 (0.90)
.006 (0.15)
.000 (0.00)
10° MAX.
.024 (0.60)
.004 (0.10)
.010 (0.25)
.004 (0.09)
Dimensions: inches (mm)
© 2002 Microchip Technology Inc.
DS21663B-page 11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet TC2054.PDF ] | |
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