TelCom Semiconductor Inc TC1173-2.5VOA, TC1173-5.0VUA, TC1173-5.0VOA, TC1173-3.3VUA, TC1173-3.3VOA Datasheet

300mA CMOS LDO with Shutdown, ERROR Output and Bypass

TC1173

FEATURES

■ Extremely Low Supply Current for Longer Battery

Life!

■ Very Low Dropout Voltage

■ Guaranteed 300mA Output

■ 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

TYPICAL APPLICATION

8

V

IN

7

NC

6

SHDN

5

ERROR

Shutdown Control
(from Power Control Logic)

R3
1M

V

IN

ERROR

C1
1µF

1

V

OUT

2

GND

TC1173

3

NC

4

Bypass

C

BYPASS

470pF
(Optional)

GENERAL DESCRIPTION

The TC1173 is a precision output (typically ±0.5%)
CMOS low dropout regulator. Total supply current is typi­cally 50µA at full load

regulators

!).

(20 to 60 times lower than in bipolar

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 out­of-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

and ERROR fall to zero when the shutdown input

OUT

is low.

The TC1173 incorporates both over-temperature and
over-current protection. The TC1173 is stable with an output
capacitor of only 1µF and has a maximum output current of
300mA.

ORDERING INFORMATION

Part Junction
Number Package Temp. Range

TC1173-xxVOA 8-Pin SOIC – 40°C to +125°C
TC1173-xxVUA 8-Pin MSOP – 40°C to +125°C

Available Output Voltages:

2.5, 2.8, 3.0, 3.3, 5.0
xx indicates output voltages

Other output voltages are available. Please contact TelCom
Semiconductor for details.

PIN CONFIGURATION

MSOP

V

OUT

GND

NC

Bypass

1
2
3

TC1173VUA

4

8

V

7

NC

6

SHDN

5

ERROR

IN

SOIC

TC1173-2 2/2/00 TelCom Semiconductor reserves the right to make changes in the circuitry and specifications of its devices.

V

OUT

GND

NC

Bypass

1
2
3

TC1173VOA

4

8
7
6
5

V

IN

NC
SHDN
ERROR

TC1173

300mA CMOS LDO With Shutdown,

ERROR Output, And Bypass

ABSOLUTE MAXIMUM RATINGS*

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

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

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

Output Voltage ........................... (V

– 0.3) to (VIN + 0.3)

SS

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

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

ELECTRICAL CHARACTERISTICS:

V

= V

IN

+ 1V, IL = 0.1µA, CL = 3.3µF, SHDN > VIH, TA = 25°C, unless otherwise noted.

OUT

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

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

*Absolute Maximum Ratings indicate device operation limits beyond dam­age may occur. Device operation beyond the limits listed in

Characteristics

is not recommended.

Electrical

Symbol Parameter Test Conditions Min Typ Max Units

V

IN

IOUT

MAX

V

OUT

∆V

/∆TV

OUT

∆V

/∆V

OUT

∆V

OUT/VOUT

V

– V

IN

OUT

I

SS1

I

SS2

PSRR Power Supply Rejection Ratio FRE ≤ 1kHz — 60 — dB
IOUT

SC

∆V

OUT∆PD

eN Output Noise F = 1kHz, C

Input Operating Voltage — — 6.0 V
Maximum Output Current 300 ——mA
Output Voltage Note 1 — VR ± 0.5% — V

VR - 2.5% VR + 2.5%

Temperature Coefficient Note 2 — — — ppm/°C

OUT

40

Line Regulation (VR + 1V) < VIN < 6V — 0.05 0.35 %

IN

Load Regulation IL = 0.1mA to I

OUT

(Note 3) — 0.5 2.0 %

MAX

Dropout Voltage (Note 4) IL = 0.1mA — 20 30 mV

I

= 100mA 80 160

L

IL = 300mA 240 480

Supply Current SHDN = V

IH

—5090 µA

Shutdown Supply Current SHDN = 0V — 0.05 0.5 µA

Output Short Circuit Current V

= 0V — 550 650 mA

OUT

Thermal Regulation Note 5 — 0.04 — V/W

= 1µF, — 260 — nV/√Hz

R

LOAD

OUT

= 50Ω

SHDN Input

V

IH

V

IL

SHDN Input High Threshold 45 ——%V
SHDN Input Low Threshold — — 15 %V

IN
IN

ERROR Output

V

MIN

V

OL

V

TH

V

OL

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

Minimum Operating Voltage 1.0 — — V
Output Logic Low Voltage 1mA Flows to ERROR — — 400 mV
ERROR Threshold Voltage — 0.95 x V

R

—V

ERROR Positive Hysteresis Note 7 — 50 — mV

2. TC V

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

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. TA, TJ, θJA). Exceeding the maximum allowable power dissipation causes the device to initiate
thermal shutdown. Please see

7. Hysteresis voltage is referenced to VR.

= (V

OUT

OUT

V

MAX –

V

OUT

OUT

x

MIN)

∆T

6

x 10

Thermal Considerations

at VIN = 6V for T = 10msec.

LMAX

section of this data sheet for more details.

TC1173-2 2/2/00

2

300mA CMOS LDO With Shutdown,
ERROR Output, And Bypass

DETAILED DESCRIPTION

The TC1173 is a fixed output, low drop-out regulator.
Unlike bipolar regulators, the TC1173 supply current does not
increase with load current. In addition, V
within regulation at very low load currents (an important consid­eration in RTC and CMOS RAM battery back-up applications).
TC1173 pin functions are detailed below:

PIN DESCRIPTIONS

Pin
No. Symbol Description

1V

OUT

2 GND Ground terminal
3 NC No connect
4 Bypass Reference bypass input. Connecting a 470pF

5 ERROR Out-of-Regulation Flag (Open Drain Out-

6 SHDN Shutdown control input. The regulator is fully

7 NC No connect
8VINUnregulated supply input

Regulated voltage output

to this input further reduces output noise.

put). This output goes low when V
of-tolerance by approximately -5%.

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).

remains stable and

OUT

OUT

is out-

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

falls to zero and ERROR is disabled.

OUT

ERROR Output

ERROR is driven low whenever V
lation by more than – 5% (typical). This condition may be
caused by low input voltage, output current limiting, or
thermal limiting.

The ERROR threshold is 5% below rated V
less of the programmed output voltage value (e.g., ERROR
= VOL at 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
below VTH, and inactive when V

OUT

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 VIH of 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
voltage less than (VIN + 0.3V.)

V

OUT

V

TH

falls out of regu-

OUT

regard-

OUT

is at or

OUT

is above VTH + VH.

, VIN or any other

OUT

Hysteresis (VH)

Figure 1 shows a typical application circuit. The regula­tor is enabled any time the shutdown input (SHDN) is above
VIH, and shutdown (disabled) when SHDN is at or below VIL.

V

OUT

TC1173-2 2/2/00

1

V

C1
1µF

Figure 1: Typical Application Circuit

OUT

2

GND

TC1173

3

NC

4

Bypass

C

BYPASS

470pF
(Optional)

8

V

IN

7

NC

6

SHDN

5

ERROR

Shutdown Control
(from Power Control Logic)

R3
1M

V

IN

ERROR

ERROR

V

IH

V

OL

Figure 2: ERROR Output Operation

Output Capacitor

A 1µF (min) capacitor from V

to ground is recom-

OUT

mended. The output capacitor should have an effective
series resistance of 5Ω or less. A 1µF capacitor should be
connected from VIN to 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 electro­lytic 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.

3