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TC1313 Datasheet, PDF (1/28 Pages) Microchip Technology – 500 mA Synchronous Buck Regulator, + 300 mA LDO | |||
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TC1313
500 mA Synchronous Buck Regulator,
+ 300 mA LDO
Features
⢠Dual-Output Regulator (500 mA Buck Regulator
and 300 mA Low-Dropout Regulator (LDO))
⢠Total Device Quiescent Current = 57 µA (Typ.)
⢠Independent Shutdown for Buck and LDO
Outputs
⢠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)
⢠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 TC1313 combines a 500 mA synchronous buck
regulator and 300 mA Low-Dropout Regulator (LDO)
to provide a highly integrated solution for devices that
require multiple supply voltages. The unique combina-
tion 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.
The TC1313 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 TC1313 standard parts,
consult your Microchip representative.
Package Type
10-Lead DFN
SHDN2 1
VIN2 2
VOUT2 3
NC 4
AGND 5
10 PGND
9 LX
8 VIN1
7 SHDN1
6 VFB1/VOUT1
10-Lead MSOP
SHDN2 1
VIN2 2
VOUT2 3
NC 4
AGND 5
10 PGND
9 LX
8 VIN1
7 SHDN1
6 VFB1/VOUT1
© 2005 Microchip Technology Inc.
DS21974A-page 1
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