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부품번호 | TC1188 기능 |
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기능 | 120 mA Linear Regulators | ||
제조업체 | Microchip | ||
로고 | |||
전체 18 페이지수
TC1188/TC1189
MAX8863/64 Pin Compatible, Low Dropout,
120 mA Linear Regulators
Features
• Input Voltage Range: 2.7 V to 6.0 V
• 120 mA Output Current
• Low Supply Current: 50 µA, (typical)
• Low Dropout Voltage: 110 mV, (typical at 100 mA)
• Fast Turn-On from Shutdown: 140 µsec (typical)
• Low Output Noise
• Over-Current and Over-Temperature Protection
• Low Power Shutdown Mode
• Auto Discharge of Output Capacitor (TC1189)
Applications
• Battery Powered Systems
• Portable Computers
• Medical Instruments
• Cellular, Cordless Phones
• PDAs
• Pagers
Package Type
5-Pin SOT-23A
GND
5
VOUT
4
TC1188
TC1189
1 23
SHDN GND VIN
NOTE: 5-Pin SOT-23A is equivalent to the EIAJ (SC-74A)
General Description
The TC1188 and TC1189 are fixed output, low dropout
linear regulators that operate from a 2.7V to 6.0V input
voltage source. The output is capable of delivering up
to 120 mA while consuming only 50 µA of quiescent
current. The low dropout voltage, 120 mV, make the
TC1188 and TC1189 good choices for battery powered
applications. Integrated over-current and over-temper-
ature protection features provide for a fault tolerant
solution.
The TC1189 includes an output voltage auto discharge
feature. When shutdown, the TC1189 will automatically
discharge the output voltage using an internal N-Chan-
nel MOSFET switch.
Fixed output voltage options for the TC1188/TC1189
are: 1.80V, 2.80V, 2.84V and 3.15V. Both the TC1188
and TC1189 are available in SOT23-5 packages.
Typical Application Circuit
+
–
Battery
CIN
1 µF
VIN VOUT
TC1188
TC1189
SHDN
GND GND
Output
Voltage
COUT
1 µF
2002-2012 Microchip Technology Inc.
DS21364C-page 1
TC1188/TC1189
2.0 TYPICAL PERFORMANCE CURVES
Note:
The graphs and tables provided following this note are a statistical summary based on a limited number of
samples and are provided for informational purposes only. The performance characteristics listed herein are
not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified
operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
0.10
0.08
0.06
0.04
0.02
0.00
–0.02
–0.04
–0.06
–0.08
–0.10
–40°C
Line Reg. @ 3.50 V
to 5.50V(%)
0°C 25°C 70°C
TEMPERATURE (°C)
85°C
FIGURE 2-1:
Line Regulation vs.
Temperature. (TC1188)
2.930
2.910
2.890
2.870
2.850
2.830
2.810
2.790
2.770
2.750
–40°C
VOUT - SET/1.0mA
@ 3.5V (V)
0°C 25°C 70°C
TEMPERATURE (°C)
85°C
FIGURE 2-2:
Output Voltage vs.
Temperature. (TC1188)
0.040
0.035
0.030
0.025
0.020
0.015
Load Reg. 0 to 50mA (%)
0.010
0.005
0.00–040°C
0°C 25°C 70°C
TEMPERATURE (°C)
85°C
FIGURE 2-3:
Load Regulation vs.
Temperature. (TC1188)
0.040
0.035
0.030
0.025
0.020
0.015 Load Reg. 0 to 50mA (%)
0.010
Load Reg. 0 to 100mA (%)
0.005
0.000
–40°C
0°C 25°C 70°C
TEMPERATURE (°C)
85°C
FIGURE 2-4:
Load Regulation vs.
Temperature. (TC1188)
0.120
0.100
50mA, Dropout V (V)
0.080
0.060
0.040
0.020
0.000
–40°C
0°C 25°C 70°C
TEMPERATURE (°C)
85°C
FIGURE 2-5:
Dropout Voltage vs.
Temperature. (TC1188)
10.0
1.0
RLOAD = 50μΩ
COUT = 1μF
0.1
0.0
0.01
0.01 1 10 100
FREQUENCY (kHz)
1000
FIGURE 2-6:
(TC1188)
Output Noise vs. Frequency.
DS21364C-page 4
2002-2012 Microchip Technology Inc.
4페이지 TC1188/TC1189
VIN
SHDN
Shutdown
Logic
GND
Thermal
Sensor
Bandgap
Reference
GND
FIGURE 3-2:
Functional Block Diagram.
3.4 Shutdown
The SHDN input is used to turn off the LDO P-Channel
pass MOSFET and internal bias. When shutdown, the
typical quiescent current consumed by the LDO is
0.1 nA. A logic low (< 0.4V) at the SHDN input will
cause the device to operate in the shutdown mode. A
logic high (> 2.0V) at the SHDN input will cause the
device to operate in the normal mode.
3.5 Current Limit
The LDO output current is monitored internal to the
TC1188/TC1189. The internal current sense will limit
the LDO output current to a typical value of 280 mA.
The current limit can range from approximately 50 mA
to 410 mA from device to device. The internal current
limit protects the device from a continuous output short
circuit.
3.6 Thermal Overload Protection
Integrated thermal protection circuitry shuts the
TC1188/TC1189 off when the internal die temperature
exceeds approximately 170°C. The regulator output
remains off until the internal die temperature drops to
approximately 150°C.
–
+
Error
Amplifier
MOS Driver
With ILIMIT
N
(TC1189 Only)
PMOS Pass
Transistor
VOUT
3.7 Operating Region and Power
Dissipation
The internal power dissipation to the LDO is primarily
determined by the input voltage, output voltage and
output current. The following equation is used to
approximate the worst case for power dissipation:
EQUATION
PD = VIN(MAX) - VOUT(MIN) x ILOAD(MAX)
Where:
PD = Worst case internal power dissipation.
VIN(MAX) = Maximum input voltage.
VOUT(MIN) = Minimum output voltage.
ILOAD(MAX) = Maximum output current.
The maximum power dissipation is a function of the
maximum ambient temperature, TA(MAX), the maximum
junction temperature, TJ(MAX), and the package thermal
resistance from junction to air, JA. The 5-Pin SOT23A
package has a JA of approximately 220°C/Watt.
EQUATION
PD = (TJ(MAX) - TA(MAX))/JA
Where all terms are previously defined.
2002-2012 Microchip Technology Inc.
DS21364C-page 7
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