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  Microchip Technology Semiconductor Electronic Components Datasheet  

TC1268 Datasheet

500mA Fixed Output / Fast Response CMOS LDO with Shutdown

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TC1268 pdf
TC1268
500mA Fixed Output, Fast Response CMOS LDO with Shutdown
Features
• Very Low Dropout Voltage
• 500mA Output Current
• High Output Voltage Accuracy
• Standard or Custom Output Voltages
• Over Current and Over Temperature Protection
• SHDN Input for Active Power Management
• ERROR Output to Detect Low Battery
• 5µsec (typical) Wake-up Time from SHDN
Applications
• RAMBUS Memory Module
• Battery-Operated Systems
• Portable Computers
• Medical Instruments
• Instrumentation
• Cellular/GSM/PHS Phones
• Linear Post-Regulator for SMPS
• Pagers
• Digital Cameras
Device Selection Table
Output*
Part Number Voltage Package
(V)
Junction
Temp. Range
TC1268-2.5VOA 2.5 8-Pin SOIC -40°C to +125°C
*Other output voltages and package options are available.
Please contact Microchip Technology Inc. for details.
Package Type
8-Pin SOIC
VOUT 1
GND 2
NC 3
BYPASS 4
TC1268
8 VIN
7 NC
6 SHDN
5 ERROR
General Description
The TC1268 is a fixed output, fast turn-on, high
accuracy (typically ±0.5%) CMOS low dropout
regulator. Designed specifically for battery-operated
systems, the TC1268’s CMOS construction eliminates
wasted ground current, significantly extending battery
life. Total supply current is typically 80µA at full load (20
to 60 times lower than in bipolar regulators).
TC1268’s key features include ultra low noise, very low
dropout voltage (typically 350mV at full load), and
fast response to step changes in load. The TC1268
also has a fast wake-up response time (5µsec typically)
when released from shutdown. The TC1268
incorporates both over temperature and over current
protection. The TC1268 is stable with an output
capacitor of only 1µF and has a maximum output
current of 500mA.
Typical Application
VIN VIN
VOUT +
VOUT
TC1268
COUT
1µF
GND
SHDN
SHDN
© 2002 Microchip Technology Inc.
DS21379B-page 1


  Microchip Technology Semiconductor Electronic Components Datasheet  

TC1268 Datasheet

500mA Fixed Output / Fast Response CMOS LDO with Shutdown

No Preview Available !

TC1268 pdf
TC1268
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings*
Input Voltage .........................................................6.5V
Power Dissipation................Internally Limited (Note 6)
Maximum Voltage on Any Pin ........ VIN +0.3V to -0.3V
Operating Temperature ............... -40°C < TJ < +125°C
Storage Temperature.......................... -65°C to +150°C
*Stresses above those listed under "Absolute Maximum
Ratings" may cause permanent damage to the device. These
are stress ratings only and functional operation of the device
at these or any other conditions above those indicated in the
operation sections of the specifications is not implied.
Exposure to Absolute Maximum Rating conditions for
extended periods may affect device reliability.
TC1268 ELECTRICAL SPECIFICATIONS
Electrical Characteristics: VIN = VOUT + 1V, IL = 100µA, CL = 3.3µF, SHDN > VIH, TA = 25°C, unless otherwise noted. Boldface
type specifications apply for junction temperatures of -40°C to +125°C.
Symbol
Parameter
Min
Typ
Max
Units
Test Conditions
VIN
IOUTMAX
VOUT
Input Operating Voltage
Maximum Output Current
Output Voltage
VOUT/T
VOUT/VIN
VOUT/VOUT
VIN-VOUT
VOUT Temperature Coefficient
Line Regulation
Load Regulation
Dropout Voltage
IDD
ISHDN
TWK
Supply Current (Active Mode)
Supply Current (Shutdown Mode)
Wake-up Time
(from Shutdown Mode)
TS Settling Time
PSRR
IOUTSC
VOUT/PD
eN
(from Shutdown Mode)
Power Supply Rejection Ratio
Output Short Circuit Current
Thermal Regulation
Output Noise
2.7
500
VR – 2.5%
VR ±0.5%
40
0.05
0.002
20
60
200
350
80
5
5
15
64
1200
0.04
260
6.0
VR + 2.5%
0.35
0.01
30
160
480
800
130
10
1400
V
mA
V
ppm/°C
%
%/mA
mV
µA
µA
µsec
µsec
dB
mA
V/W
nV/Hz
Note 8
Note 1
Note 2
(VR + 1V) VIN 6V
IL = 0.1mA to IOUTMAX (Note 3)
IL = 100µA
IL = 100mA
IL = 300mA
IL = 500mA (Note 4)
SHDN = VIH, IL = 0
SHDN = 0V
VIN = 3.5V, VOUT = 2.5V
CIN = COUT = 1µF
IL = 250mA (See Figure 3-2)
VIN = 3.5V, VOUT = 2.5V
CIN = COUT = 1µF
IL = 250mA (See Figure 3-2)
FRE 1kHz
VOUT = 0V
Note 5
IL = IOUTMAX
SHDN Input
VIH
VIL
Note 1:
2:
3:
4:
5:
6:
7:
8:
SHDN Input High Threshold
45 — — %VIN
SHDN Input Low Threshold
— — 15 %VIN
VR is the regulator output voltage setting.
TC VOUT = (VOUTMAX – VOUTMIN) x 106
VOUT x T
Regulation is measured at a constant junction temperature using low duty cycle pulse testing. Load regulation is tested over a load range from
0.1mA to the maximum specified output current. Changes in output voltage due to heating effects are covered by the thermal regulation
specification.
Dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at a 1V
differential.
Thermal Regulation is defined as the change in output voltage at a time T after a change in power dissipation is applied, excluding load or
line regulation effects. Specifications are for a current pulse equal to ILMAX at VIN = 6V for T = 10 msec.
The maximum allowable power dissipation is a function of ambient temperature, the maximum allowable junction temperature and the
thermal resistance from junction-to-air (i.e., TA, TJ, θJA). Exceeding the maximum allowable power dissipation causes the device to initiate
thermal shutdown. Please see Section 4.0 Thermal Considerations for more details.
Hysteresis voltage is referenced to VR.
The minimum VIN has to justify the conditions: VIN VR + VDROPOUT and VIN 2.7V for IL = 0.1mA to IOUTMAX.
DS21379B-page 2
© 2002 Microchip Technology Inc.


Part Number TC1268
Description 500mA Fixed Output / Fast Response CMOS LDO with Shutdown
Maker Microchip Technology
Total Page 12 Pages
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