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PDF TC1303B Data sheet ( Hoja de datos )
| Número de pieza | TC1303B | |
| Descripción | (TC1303 / TC1304) 500 mA Synchronous Buck Regulator | |
| Fabricantes | Microchip Technology | |
| Logotipo |  |
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TC1303A/TC1303B/
TC1303C/TC1304
500 mA Synchronous Buck Regulator,
+ 300 mA LDO with Power-Good Output
Features
• Dual-Output Regulator (500 mA Buck Regulator
and 300 mA Low-Dropout Regulator)
www.DataSheet4U.com• Power-Good Output with 300 ms Delay
• Total Device Quiescent Current = 65 µA, Typ.
• Independent Shutdown for Buck and LDO
Outputs (TC1303)
• Both Outputs Internally Compensated
• Synchronous Buck Regulator:
- Over 90% Typical Efficiency
- 2.0 MHz Fixed-Frequency PWM
(Heavy Load)
- Low Output Noise
- Automatic PWM to PFM mode transition
- Adjustable (0.8V to 4.5V) and Standard
Fixed-Output Voltages (0.8V, 1.2V, 1.5V,
1.8V, 2.5V, 3.3V)
• Low-Dropout Regulator:
- Low-Dropout Voltage = 137 mV Typ. @
200 mA
- Standard Fixed-Output Voltages
(1.5V, 1.8V, 2.5V, 3.3V)
• Power-Good Function:
- Monitors Buck Output Function (TC1303A)
- Monitors LDO Output Function (TC1303B)
- Monitors Both Buck and LDO Output Func-
tions (TC1303C and TC1304)
- 300 ms Delay Used for Processor Reset
• Sequenced Startup and Shutdown (TC1304)
• Small 10-pin 3X3 DFN or MSOP Package
Options
• Operating Junction Temperature Range:
- -40°C to +125°C
• Undervoltage Lockout (UVLO)
• Output Short Circuit Protection
• Overtemperature Protection
Applications
• Cellular Phones
• Portable Computers
• USB-Powered Devices
• Handheld Medical Instruments
• Organizers and PDAs
Description
The TC1303/TC1304 combines a 500 mA synchro-
nous buck regulator and 300 mA Low-Dropout Regula-
tor (LDO) with a power-good monitor to provide a highly
integrated solution for devices that require multiple
supply voltages. The unique combination of an
integrated buck switching regulator and low-dropout
linear regulator provides the lowest system cost for
dual-output voltage applications that require one lower
processor core voltage and one higher bias voltage.
The 500 mA synchronous buck regulator switches at a
fixed frequency of 2.0 MHz when the load is heavy,
providing a low noise, small-size solution. When the
load on the buck output is reduced to light levels, it
changes operation to a Pulse Frequency Modulation
(PFM) mode to minimize quiescent current draw from
the battery. No intervention is necessary for smooth
transition from one mode to another.
The LDO provides a 300 mA auxiliary output that
requires a single 1 µF ceramic output capacitor,
minimizing board area and cost. The typical dropout
voltage for the LDO output is 137 mV for a 200 mA
load.
For the TC1303/TC1304, the power-good output is
based on the regulation of the buck regulator output, the
LDO output or the combination of both. The TC1304
features start-up and shutdown output sequencing.
The TC1303/TC1304 is available in either the 10-pin
DFN or MSOP package.
Additional protection features include: UVLO,
overtemperature and overcurrent protection on both
outputs.
For a complete listing of TC1303/TC1304 standard
parts, consult your Microchip representative.
© 2005 Microchip Technology Inc.
DS21949B-page 1
1 page  
TC1303A/TC1303B/TC1303C/TC1304
Typical Application Circuits
VIN
2.7V to 4.2V
4.7 µF
www.DataSheet4U.com
RPULLUP
Processor
RESET
TC1303A
Fixed-Output Application
10-Lead MSOP
8 VIN1
LX 9
2 VIN2
PGND 10
7 SHDN1 VOUT1 6
1 SHDN2 VOUT2 3
4 PG
AGND 5
4.7 µH
4.7 µF
VOUT1
1.5V @ 500 mA
1 µF
VOUT2
2.5V @ 300 mA
TC1303B
Adjustable-Output Application
10-Lead DFN
Input
Voltage
4.5V to 5.5V
4.7 µF
*Optional
Capacitor
VIN2
1.0 µF
Processor
RESET
8 VIN1
2 VIN2
LX 9
PGND 10
7 SHDN1 VOUT1 6
1 SHDN2 VOUT2 3
4 PG
AGND 5
(Note)
4.7 µH
4.7 µF
200 kΩ 4.99 kΩ
1 µF
VOUT2
3.3V @
300 mA
33 pF
121 kΩ
Note: Connect DFN package exposed pad to AGND.
VOUT1
2.1V @
500 mA
VIN
2.7V to 4.2V
4.7 µF
RPULLUP
Processor
RESET
TC1304
Fixed-Output Application
10-Lead MSOP
8 VIN1
2 VIN2
7 AGND
1 SHDN
4 PG
LX 9
PGND 10
VOUT1 6
VOUT2 3
AGND 5
4.7 µH
4.7 µF
VOUT1
1.2V @ 500 mA
VOUT2
1 µF 2.5V @ 300 mA
© 2005 Microchip Technology Inc.
DS21949B-page 5
5 Page 
TC1303A/TC1303B/TC1303C/TC1304
Note: Unless otherwise indicated, VIN1 = VIN2 = SHDN1,2 = 3.6V, COUT1 = CIN = 4.7 µF, COUT2 = 1 µF, L = 4.7 µH,
VOUT1 (ADJ) = 1.8V, TA = +25°C. Boldface specifications apply over the TA range of -40°C to +85°C. TA = +25°C. Adjustable- or fixed-
output voltage options can be used to generate the Typical Performance Characteristics.
www.DataSheet4U.com
100
95
90
IOUT1 = 100 mA
SHDN1 = VIN2
SHDN2 = AGND
85 IOUT1 = 250 mA
80 IOUT1 = 500 mA
75
70
65
60
2.7 3.05 3.4 3.75 4.1 4.45 4.8 5.15 5.5
Input Voltage (V)
FIGURE 2-7:
VOUT1 Output Efficiency vs.
Input Voltage (VOUT1 = 1.8V).
100 VIN1 = 3.6V
95
90
85
VIN1 = 4.2V
80
75 VIN1 = 5.5V
70
65
60
0.005 0.104 0.203
SHDN1 = VIN2
SHDN2 = AGND
0.302 0.401 0.5
IOUT1 (A)
FIGURE 2-10:
VOUT1 Output Efficiency vs.
IOUT1 (VOUT1 = 3.3V).
100
95 VIN = 3.0V
SHDN1 = VIN2
SHDN2 = AGND
90
VIN = 4.2V
85
80
75
0.005
0.104
VIN = 3.6V
0.203 0.302
IOUT1 (A)
0.401
0.5
FIGURE 2-8:
VOUT1 Output Efficiency vs.
IOUT1 (VOUT1 = 1.8V).
1.21
1.206
1.202
VIN1 = 3.6V
SHDN1 = VIN2
SHDN2 = AGND
1.198
1.194
1.19
0.005
0.104
0.203 0.302
IOUT1 (A)
0.401
0.5
FIGURE 2-11:
(VOUT1 = 1.2V).
VOUT1 vs. IOUT1
100
96
IOUT1 = 100 mA
SHDN1 = VIN2
SHDN2 = AGND
92
IOUT1 = 250 mA
88
IOUT1 = 500 mA
84
80
3.60
3.92
4.23 4.55 4.87
Input Voltage (V)
5.18
5.50
FIGURE 2-9:
VOUT1 Output Efficiency vs.
Input Voltage (VOUT1 = 3.3V).
1.82
1.815
1.81
1.805
1.8
1.795
1.79
0.005
VIN1 = 3.6V
SHDN1 = VIN2
SHDN2 = AGND
0.104
0.203 0.302
IOUT1 (A)
0.401
0.5
FIGURE 2-12:
(VOUT1 = 1.8V).
VOUT1 vs. IOUT1
© 2005 Microchip Technology Inc.
DS21949B-page 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet TC1303B.PDF ] | |
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