TC1173-2.8VOART [MICROCHIP]

2.8 V FIXED POSITIVE LDO REGULATOR, 0.48 V DROPOUT, PDSO8, SOIC-8;


型号：	TC1173-2.8VOART
厂家：	MICROCHIP
描述：	2.8 V FIXED POSITIVE LDO REGULATOR, 0.48 V DROPOUT, PDSO8, SOIC-8 光电二极管输出元件调节器
文件：	总8页 (文件大小：62K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

TC1173

300mA CMOS LDO with Shutdown, ERROR Output and Bypass

GENERAL DESCRIPTION

FEATURES

The TC1173 is a precision output (typically ±0.5%)

CMOS low dropout regulator. Total supply current is typi-

cally 50µA at full load (20 to 60 times lower than in bipolar

regulators!).

■ Extremely Low Supply Current for Longer

Battery Life!

■ Very Low Dropout Voltage

■ 300mA Output

TC1173 key features include ultra low noise operation

(plus optional Bypass input); very low dropout voltage

(typically 240mV at full load) and internal feed-forward

compensation for fast response to step changes in load. An

error output (ERROR) is asserted when the TC1173 is out-

of-regulation (due to a low input voltage or excessive output

current). ERROR can be set as a low battery warning or as

a processor RESET signal (with the addition of an external

RC network). Supply current is reduced to 0.05µA (typical)

and V_OUTand ERROR fall to zero when the shutdown input

is low.

■ Standard or Custom Output Voltages

■ ERROR Output Can be Used as a Low Battery

Detector or Processor Reset Generator

■ Power-Saving Shutdown Mode

■ Bypass Input for Ultra-Quiet Operation

■ Over-Current and Over-Temperature Protection

■ Space-Saving MSOP Package Option

APPLICATIONS

■ Battery-Operated Systems

■ Portable Computers

■ Medical Instruments

■ Instrumentation

■ Cellular / GSM / PHS Phones

■ Linear Post-Regulator for SMPS

■ Pagers

The TC1173 incorporates both over-temperature and

over-currentprotection.TheTC1173isstablewithanoutput

capacitor of only 1µF and has a maximum output current of

300mA.

ORDERING INFORMATION

Part

Junction

Number

Package

Temp. Range

TYPICAL APPLICATION

TC1173-xxVOA

TC1173-xxVUA

8-Pin SOIC

8-Pin MSOP

– 40°C to +125°C

V_IN

V_OUT

GND

V_IN

1µF

Available Output Voltages:

2.5, 2.8, 3.0, 3.3, 5.0

xx indicates output voltages

TC1173

SHDN

Other output voltages are available. Please contact Microchip

Technology Inc. for details.

Bypass

ERROR

PIN CONFIGURATION

MSOP

C_BYPASS

470pF

(Optional)

Shutdown Control

(from Power Control Logic)

V_OUT

GND

V_IN

TC1173VUA

SHDN

ERROR

Bypass

SOIC

V_OUT

GND

V_IN

3 TC1173VOA

SHDN

Bypass 4

ERROR

TC1173-2 2/2/00

300mA CMOS LDO With Shutdown,

ERROR Output, And Bypass

TC1173

Storage Temperature ............................ – 65°C to +150°C

Maximum Voltage on Any Pin ............ V_IN+0.3V to – 0.3V

Lead Temperature (Soldering, 10 Sec.)................ +300°C

ABSOLUTE MAXIMUM RATINGS*

Input Voltage ..............................................................6.5V

Output Voltage ........................... (V_SS– 0.3) to (V_IN+ 0.3)

Power Dissipation ....................Internally Limited (Note 7)

Operating Temperature.................... – 40°C < T_J< 125°C

*Absolute Maximum Ratings indicate device operation limits beyond dam-

age may occur. Device operation beyond the limits listed in Electrical

Characteristics is not recommended.

ELECTRICAL CHARACTERISTICS: V_IN= V_OUT+ 1V, I_L= 0.1µA, C_L= 3.3µF, SHDN > V_IH, T_A= 25°C, unless otherwise noted.

BOLDFACE type specifications apply for junction temperatures of – 40°C to +125°C

Symbol

Parameter

Test Conditions

Min

Typ

Max

Units

V_IN

Input Operating Voltage

Maximum Output Current

Output Voltage

—

6.0

IOUT

300

—

MAX

V_OUT

Note 1

Note 2

—

V_R± 0.5%

—

V_R- 2.5%

V_R+ 2.5%

∆V_OUT/∆T

V_OUTTemperature Coefficient

—

ppm/°C

∆V_OUT/∆V_IN

∆V_OUT/V_OUT

V_IN– V_OUT

Line Regulation

(V_R+ 1V) < V_IN< 6V

—

0.05

0.5

0.35

2.0

Load Regulation

I_L= 0.1mA to I_OUT_MAX(Note 3)

Dropout Voltage (Note 4)

I_L= 0.1mA

I_L= 100mA

I_L= 300mA

240

160

480

I_SS1

Supply Current

SHDN = V_IH

SHDN = 0V

—

0.05

0.5

—

µA

I_SS2

Shutdown Supply Current

Power Supply Rejection Ratio

Output Short Circuit Current

Thermal Regulation

PSRR

_RE≤ 1kHz

IOUT

V_OUT= 0V

550

0.04

260

650

—

∆V_OUT∆P_D

Note 5

V/W

nV/√Hz

Output Noise

F = 1kHz, C_OUT= 1µF,

—

R_LOAD= 50Ω

SHDN Input

V_IH

V_IL

SHDN Input High Threshold

SHDN Input Low Threshold

—

%V_IN

—

ERROR Output

V_MIN

V_OL

V_TH

V_OL

Minimum Operating Voltage

1.0

—

400

—

Output Logic Low Voltage

ERROR Threshold Voltage

ERROR Positive Hysteresis

1mA Flows to ERROR

Note 7

0.95 x V_R

—

NOTES: 1. V_Ris the user-programmed regulator output voltage setting.

_MIN) x 10 ⁶

2. T_CV_OUT= (V_OUT

OUT

–

MAX

∆T

V_OUT

3. 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.

4. 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.

5. 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 I_LMAXat V_IN= 6V for T = 10msec.

6. 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. T_A, T_J, θ_JA). Exceeding the maximum allowable power dissipation causes the device to initiate

thermal shutdown. Please see Thermal Considerations section of this data sheet for more details.

7. Hysteresis voltage is referenced to V_R.

TC1173-2 2/2/00

300mA CMOS LDO With Shutdown,

ERROR Output, And Bypass

TC1173

SHDN may be controlled by a CMOS logic gate, or I/O port

of a microcontroller. If the SHDN input is not required, it

should be connected directly to the input supply. While in

shutdown, supply current decreases to 0.05µA (typical),

V_OUTfalls to zero and ERROR is disabled.

DETAILED DESCRIPTION

The TC1173 is a fixed output, low drop-out regulator.

Unlike bipolar regulators, the TC1173 supply current does not

increasewithloadcurrent. Inaddition, V_OUTremainsstableand

withinregulationatverylowloadcurrents(animportantconsid-

eration in RTC and CMOS RAM battery back-up applications).

TC1173 pin functions are detailed below:

ERROR Output

ERROR is driven low whenever V_OUTfalls out of regu-

lation by more than – 5% (typical). This condition may be

caused by low input voltage, output current limiting, or

thermal limiting.

PIN DESCRIPTIONS

The ERROR threshold is 5% below rated V_OUTregard-

less of the programmed output voltage value (e.g., ERROR

= V_OLat 4.75V (typ) for a 5.0V regulator and 2.85V (typ) for

a 3.0V regulator). ERROR output operation is shown in

Figure 2. Note that ERROR is active when V_OUTis at or

below V_TH, and inactive when V_OUTis above V_TH+ V_H.

As shown in Figure 1, ERROR can be used as a battery

low flag, or as a processor RESET signal (with the addition

of timing capacitor C2). R1 x C3 should be chosen to

maintain ERROR below V_IHof the processor RESET input

for at least 200msec to allow time for the system to stabilize.

Pull-up resistor R1 can be tied to V_OUT, V_INor any other

voltage less than (V_IN+ 0.3V.)

No.

Symbol Description

V_OUT

GND

Regulated voltage output

Ground terminal

No connect

Bypass

Referencebypassinput.Connectinga470pF

to this input further reduces output noise.

ERROR

SHDN

Out-of-Regulation Flag (Open Drain Out-

put). This output goes low when V_OUTis out-

of-tolerance by approximately -5%.

Shutdown control input. The regulator is fully

enabled when a logic high is applied to this

input. The regulator enters shutdown when a

logic low is applied to this input. During

shutdown, output voltage falls to zero and

supply current is reduced to 0.05µA (typical).

V_OUT

V_IN

No connect

Hysteresis (V_H)

V_TH

Unregulated supply input

Figure 1 shows a typical application circuit. The regula-

tor is enabled any time the shutdown input (SHDN) is above

V_IH, and shutdown (disabled) when SHDN is at or below V_IL.

ERROR

V_IH

V_OL

Figure 2: ERROR Output Operation

V_IN

V_OUT

GND

V_IN

1µF

Output Capacitor

A 1µF (min) capacitor from V_OUTto ground is recom-

mended. The output capacitor should have an effective

series resistance of 5Ω or less. A 1µF capacitor should be

connected from V_INto GND if there is more than 10 inches

of wire between the regulator and the AC filter capacitor, or

if a battery is used as the power source. Aluminum electro-

lytic or tantalum capacitor types can be used. (Since many

aluminum electrolytic capacitors freeze at approximately –

30°C, solid tantalums are recommended for applications

operating below – 25°C.) When operating from sources

other than batteries, supply-noise rejection and transient

response can be improved by increasing the value of the

input and output capacitors and employing passive filtering

techniques.

TC1173

SHDN

Bypass

ERROR

C_BYPASS

470pF

(Optional)

Shutdown Control

(from Power Control Logic)

Figure 1: Typical Application Circuit

TC1173-2 2/2/00

300mA CMOS LDO With Shutdown,

ERROR Output, And Bypass

TC1173

Bypass Input

Equation 1 can be used in conjunction with Equation 2

to ensure regulator thermal operation is within limits. For

example:

A 470pF capacitor connected from the Bypass input to

ground reduces noise present on the internal reference,

which in turn significantly reduces output noise. If output

noise is not a concern, this input may be left unconnected.

Larger capacitor values may be used, but results in a longer

time period to rated output voltage when power is initially

applied.

GIVEN:

VIN_MAX= 3.0V ± 10%

VOUT_MIN= 2.7V ± 0.5%

I_LOADMAX= 250mA

= 125°C

= 55°C

MAX

ꢀ_JA= 200°C/W

Thermal Considerations

8-Pin MSOP Package

Thermal Shutdown

FIND:

1. Actual power dissipation

Integrated thermal protection circuitry shuts the regula-

tor off when die temperature exceeds 150°C. The regulator

remains off until the die temperature drops to approximately

140°C.

2. Maximum allowable dissipation

Actual power dissipation:

P_D≈ (VIN_MAX- VOUT_MIN)ILOAD

MAX

= [(3.0 x 1.1) - (2.7 x .995)]250 x 10^-3

Power Dissipation

The amount of power the regulator dissipates is prima-

rilyafunctionofinputandoutputvoltage,andoutputcurrent.

Thefollowingequationisusedtocalculateworstcaseactual

power dissipation:

= 155mW

Maximum allowable power dissipation:

MAX

P_D≈ (T _MAX– T

)

ꢀ_JA

P_D≈ (VIN_MAX– VOUT_MIN)ILOAD

MAX

Where:

P_D= worst case actual power dissipation

VIN_MAX= maximum voltage on V_IN

= (125 – 55)

200

VOUT_MIN= minimum regulator output voltage

ILOAD_MAX= maximum output (load) current

= 350mW

In this example, the TC1173 dissipates a maximum of

only 155mW; far below the allowable limit of 350mW. In a

similar manner, Equation 1 and Equation 2 can be used to

calculate maximum current and/or input voltage limits. For

example, the maximum allowable V_INis found by substitut-

ing the maximum allowable power dissipation of 350mW

into Equation 1, from which VIN_MAX= 4.1V.

Equation 1.

The maximum allowablepower dissipation (Equation 2)

is a function of the maximum ambient temperature (T^A_MAX),

the maximum allowable die temperature (125°C), and the

thermal resistance from junction-to-air (ꢀ_JA). The 8-Pin

SOIC package has a ꢀ_JAof approximately 160°C/Watt,

while the 8-Pin MSOP package has a ꢀ_JAof approximately

200°C/Watt; both when mounted on a single layer FR4

dielectric copper clad PC board.

Layout Considerations

The primary path of heat conduction out of the package

isviathepackageleads. Therefore, layoutshavingaground

plane, wide traces at the pads, and wide power supply bus

lines combine to lower ꢀ_JAand, therefore, increase the

maximum allowable power dissipation limit.

P_DMAX= (T_JMAX– T_A

)

MAX

ꢀ_JA

Where all terms are previously defined.

Equation 2.

TC1173-2 2/2/00

300mA CMOS LDO With Shutdown,

ERROR Output, And Bypass

TC1173

TYPICAL CHARACTERISTICS

Load Regulation

Line Regulation

Output Noise

2.00

1.80

0.012

0.010

10.0

1.0

= 50Ω

= 1µF

LOAD

OUT

1.60

1.40

1.20

1 to 300mA

1 to 100mA

0.008

0.006

1.00

0.80

0.60

0.40

0.004

0.002

0.000

0.1

0.0

1 to 50mA

–0.002

0.20

0.00

–0.004

0.01

–40 –20

20 40 60 80 100 120

–40 –20

0.01

100

1000

20 40 60 80 100 120

FREQUENCY (KHz)

TEMPERATURE (°C)

Supply Current

Dropout Voltage vs. Load Current

vs. Temperature

OUT

100.0

90.0

80.0

3.075

3.025

0.40

0.35

125°C

85°C

= 4V

= 100µA

LOAD

= 3.3µF

LOAD

0.30

0.25

0.20

0.15

0.10

0.05

0.00

70°C

25°C

70.0

60.0

50.0

40.0

0°C

2.975

–40°C

2.925

–40 –20

20 40 60 80 100 120

TEMPERATURE (°C)

150 200 250 300

100

TEMPERATURE (°C)

LOAD CURRENT (mA)

Power Supply Rejection Ratio

= 5V

–30dB

–35dB

–40dB

OUT

= 50Ω

= 50mV p-p

LOAD

INAC

–45dB

–50dB

–55dB

–60dB

–65dB

–70dB

–75dB

= 1µF

OUT

–80dB

100K

100

10K

FREQUENCY (KHz)

TC1173-2 2/2/00

300mA CMOS LDO With Shutdown,

ERROR Output, And Bypass

TC1173

TAPE AND REEL DIAGRAMS

Component Taping Orientation for 8-Pin SOIC (Narrow) Devices

User Direction of Feed

PIN 1

Standard Reel Component Orientation

for TR Suffix Device

Standard Reel Component Orientation

for RT Suffix Device

Carrier Tape, Number of Components Per Reel and Reel Size

Package

Carrier Width (W)

Pitch (P)

Part Per Full Reel

Reel Size

8-Pin SOIC (N)

12 mm

8 mm

2500

13 in

Component Taping Orientation for 8-Pin MSOP Devices

User Direction of Feed

PIN 1

Standard Reel Component Orientation

for TR Suffix Device

Reverse Reel Component Orientation

for RT Suffix Device

Carrier Tape, Number of Components Per Reel and Reel Size

Package

Carrier Width (W)

Pitch (P)

Part Per Full Reel

Reel Size

8-Pin MSOP

12 mm

8 mm

2500

13 in

TC1173-2 2/2/00

300mA CMOS LDO With Shutdown,

ERROR Output, And Bypass

TC1173

PACKAGE DIMENSIONS

8-Pin SOIC (Narrow)

PIN 1

.157 (3.99)

.150 (3.81)

.244 (6.20)

.228 (5.79)

.050 (1.27) TYP.

.197 (5.00)

.189 (4.80)

.069 (1.75)

.053 (1.35)

.010 (0.25)

.007 (0.18)

8° MAX.

.020 (0.51)

.013 (0.33)

.010 (0.25)

.004 (0.10)

.050 (1.27)

.016 (0.40)

8-Pin MSOP

PIN 1

.197 (5.00)

.189 (4.80)

.122 (3.10)

.114 (2.90)

.026 (0.65) TYP.

.122 (3.10)

.114 (2.90)

.043 (1.10)

MAX.

.008 (0.20)

.005 (0.13)

6° MAX.

.016 (0.40)

.010 (0.25)

.006 (0.15)

.002 (0.05)

.028 (0.70)

.016 (0.40)

Dimensions: inches (mm)

TC1173-2 2/2/00

300mA CMOS LDO With Shutdown,

ERROR Output, And Bypass

TC1173

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TC1173-2 2/2/00

TC1173-2.8VOART [MICROCHIP]

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