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PDF TC1185 Data sheet ( Hoja de datos )
| Número de pieza | TC1185 | |
| Descripción | CMOS LDOs | |
| Fabricantes | Microchip | |
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TC1014/TC1015/TC1185
50 mA, 100 mA and 150 mA CMOS LDOs with Shutdown
and Reference Bypass
Features:
General Description
• Low Supply Current (50 µA, typical)
• Low Dropout Voltage
• Choice of 50 mA (TC1014), 100 mA (TC1015)
and 150 mA (TC1185) Output
• High Output Voltage Accuracy
• Standard or Custom Output Voltages
• Power-Saving Shutdown Mode
• Reference Bypass Input for Ultra Low-Noise
Operation
• Overcurrent and Overtemperature Protection
• Space-Saving 5-Pin SOT-23 Package
• Pin-Compatible Upgrades for Bipolar Regulators
• Standard Output Voltage Options:
- 1.8V, 2.5V, 2.6V, 2.7V, 2.8V, 2.85V, 3.0V,
3.3V, 3.6V, 4.0V, 5.0V
Applications:
• Battery-Operated Systems
• Portable Computers
• Medical Instruments
• Instrumentation
• Cellular/GSM/PHS Phones
• Linear Post-Regulator for SMPS
• Pagers
Typical Application
VIN 1 VIN
VOUT 5
VOUT
TC1014
TC1015
+
1 µF
2
TC1185
GND
The TC1014/TC1015/TC1185 are high accuracy
(typically ±0.5%) CMOS upgrades for older (bipolar)
Low Dropout Regulators (LDOs) such as the LP2980.
Designed specifically for battery-operated systems, the
devices’ CMOS construction eliminates wasted ground
current, significantly extending battery life. Total supply
current is typically 50 µA at full load (20 to 60 times
lower than in bipolar regulators).
The devices’ key features include ultra low-noise
operation (plus optional Bypass input), fast response to
step changes in load, and very low dropout voltage,
typically 85 mV (TC1014), 180 mV (TC1015), and
270 mV (TC1185) at full-load. Supply current is
reduced to 0.5 µA (max) and VOUT falls to zero when
the shutdown input is low. The devices incorporate both
overtemperature and overcurrent protection.
The TC1014/TC1015/TC1185 are stable with an output
capacitor of only 1 µF and have a maximum output
current of 50 mA, 100 mA and 150 mA, respectively.
For higher output current regulators, please see the
TC1107 (DS21356), TC1108 (DS21357), TC1173
(DS21362) (IOUT = 300 mA) data sheets.
Package Type
5-Pin SOT-23
VOUT
Bypass
54
TC1014
TC1015
TC1185
1 23
3
SHDN
4
Bypass
470 pF
Reference
Bypass Cap
(Optional)
VIN GND SHDN
Shutdown Control
(from Power Control Logic)
© 2007 Microchip Technology Inc.
DS21335E-page 1
1 page  
TC1014/TC1015/TC1185
TYPICAL PERFORMANCE CURVES (CONTINUED)
Note: Unless otherwise specified, all parts are measured at temperature = +25°C.
Ground Current vs. VIN
80
70
VOUT = 3.3V
ILOAD = 150mA
60
50
40
30
20
10 CIN = 1µF
COUT = 1µF
0
0 0.5 1 1.5 2 2.55 3 3..55 4 4.55 5 5..55 6 6.55 77 7.5
VIN (V)
FIGURE 2-7:
Voltage (VIN).
Ground Current vs. Input
3.5
VOUT = 3.3V
3 ILOAD = 0
VOUT vs. VIN
2.5
2
1.5
1
0.5 CIN = 1µF
COUT = 1µF
0
0 00..5 11 11.5.5 2 2.5 3 33..55 44 4.5 55 55..55 66 66..55 77
VIN (V)
FIGURE 2-10:
Output Voltage (VOUT) vs.
Input Voltage (VIN).
VOUT vs. VIN
3.5
3.0
IVILLOOOUAATDD===
31.030VmA
100mA
2.5
2.0
1.5
1.0
0.5 CIN = 1µF
0.0 COUT = 1µF
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7
VIN (V)
FIGURE 2-8:
Output Voltage (VOUT) vs.
Input Voltage (VIN).
3.320
3.315
3.310
Output Voltage vs. Temperature
VOUT = 3.3V
ILOAD = 10mA
3.305
3.300
3.295
3.290
3.285
3.280
3.275
CIN = 1µF
COUT = 1µF
VIN = 4.3V
-40 -20 -10 0
20 40
TEMPERATURE (°C)
85
125
FIGURE 2-11:
Temperature.
Output Voltage (VOUT) vs.
3.290
3.288
3.286
3.284
3.282
3.280
3.278
3.276
3.274
Output Voltage vs. Temperature
VOUT = 3.3V
ILOAD = 150mA
CIN = 1µF
COUT = 1µF
VIN = 4.3V
-40 -20 -10 0 20 40
TEMPERATURE (°C)
85 125
FIGURE 2-9:
Temperature.
Output Voltage (VOUT) vs.
© 2007 Microchip Technology Inc.
DS21335E-page 5
5 Page 
TC1014/TC1015/TC1185
3.0 PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1: PIN FUNCTION TABLE
Pin No.
(5-Pin SOT-23)
1
2
3
4
5
Symbol
Description
VIN
GND
SHDN
Bypass
VOUT
Unregulated supply input.
Ground terminal.
Shutdown control input. The regulator is fully enabled when a logic high is applied to
this input. The regulator enters shutdown when a logic low is applied to this input.
During shutdown, output voltage falls to zero and supply current is reduced to
0.5 µA (maximum).
Reference bypass input. Connecting a 470 pF to this input further reduces output
noise.
Regulated voltage output.
3.1 Input Voltage (VIN)
Connect the VIN pin to the unregulated source
voltage. Like all low dropout linear regulators, low
source impedance is necessary for the stable
operation of the LDO. The amount of capacitance
required to ensure low source impedance will
depend on the proximity of the input source
capacitors or battery type. For most applications,
1.0 µF of capacitance will ensure stable operation
of the LDO circuit. The type of capacitor used can
be ceramic, tantalum or aluminum electrolytic.
The low Effective Series Resistance (ESR) char-
acteristics of the ceramic will yield better noise
and Power Supply Ripple Rejection (PSRR)
performance at high frequency.
3.2 Ground Terminal (GND)
Connect the ground pin to the input voltage
return. For the optimal noise and PSRR
performance, the GND pin of the LDO should be
tied to a quiet circuit ground. For applications
have switching or noisy inputs tie the GND pin to
the return of the output capacitor. Ground planes
help lower inductance and voltage spikes caused
by fast transient load currents and are
recommended for applications that are subjected
to fast load transients.
3.3 Shutdown (SHDN)
The Shutdown input is used to turn the LDO on
and off. When the SHDN pin is at a logic high
level, the LDO output is enabled. When the
SHDN pin is pulled to a logic low, the LDO output
is disabled. When disabled, the quiescent current
used by the LDO is less than 0.5 µA max.
3.4 Bypass
Connecting a low-value ceramic capacitor to the
Bypass pin will further reduce output voltage
noise and improve the PSRR performance of the
LDO. While smaller and larger values can be
used, these affect the speed at which the LDO
output voltage rises when the input power is
applied. The larger the bypass capacitor, the
slower the output voltage will rise.
3.5 Output Voltage (VOUT)
Connect the output load to VOUT of the LDO. Also
connect one side of the LDO output capacitor as
close as possible to the VOUT pin.
© 2007 Microchip Technology Inc.
DS21335E-page 11
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet TC1185.PDF ] | |
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