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TC1313 Datasheet

  • TC1313

  • 500 mA Synchronous Buck Regulator,+ 300 mA LDO

  • 746.64KB

  • 32頁

  • Microchip   Microchip

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TC1313
500 mA Synchronous Buck Regulator,
+ 300 mA LDO
Features
鈥?Dual-Output Regulator (500 mA Buck Regulator
and 300 mA Low-Dropout Regulator (LDO))
鈥?Total Device Quiescent Current = 57 碌A(chǔ) (Typ.)
鈥?Independent Shutdown for Buck and LDO
Outputs
鈥?Both Outputs Internally Compensated
鈥?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)
鈥?Low-Dropout Regulator:
- Low-Dropout Voltage = 137 mV Typ. @
200 mA
- Standard Fixed-Output Voltages
(1.5V, 1.8V, 2.5V, 3.3V)
鈥?Small 10-pin 3X3 DFN or MSOP Package
Options
鈥?Operating Junction Temperature Range:
- -40擄C to +125擄C
鈥?Undervoltage Lockout (UVLO)
鈥?Output Short Circuit Protection
鈥?Overtemperature Protection
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 碌F 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.
Applications
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Cellular Phones
Portable Computers
USB-Powered Devices
Handheld Medical Instruments
Organizers and PDAs
Package Type
10-Lead DFN
SHDN2
1
V
IN2
2
V
OUT2
3
NC
4
A
GND
5
10
P
GND
9
L
X
8
V
IN1
7
SHDN1
6
V
FB1
/V
OUT1
10-Lead MSOP
SHDN2
1
V
IN2
2
V
OUT2
3
NC
4
A
GND
5
10
P
GND
9
L
X
8
7
V
IN1
SHDN1
6
V
FB1
/V
OUT1
漏
2005 Microchip Technology Inc.
DS21974A-page 1

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