Datasheet ILC7280CS-3028, ILC7280CS-3025, ILC7280CS-2530, ILC7280CS-3030, ILC7280CS-2828 Datasheet (Impala Linear Corporation)

Ordering Information* (TA= -40°C to +85°C)

ILC7280CS-2530 150mA 2.5V and 3.0V LDO regulators
ILC7280CS-3028 150mA 3.0V and 2.8V LDO regulators
ILC7280CS-2828 150mA 2.8V and 2.8V LDO regulators
ILC7280CS-3030 150mA 3.0V and 3.0V LDO regulators
ILC7280CS-3025 150mA 3.0V and 2.5V LDO regulators

+

+

+

V

INA

V

INB

1µF

ceramic

EN

A

EN

B

GND

C

NOISE

22pF

(optional)

0.47-2.2µF
ceramic

V

OUTA

V

OUTB

0.47-2.2µF
ceramic

4.7µF

+

The ILC7280 is two independent 150mA low dropout (LDO)
voltage regulators in an 8-pin MSOP package. Each regu­lator output is independently short circuit protected and has
independent enable lines. The device offers a unique com­bination of low dropout voltage and low quiescent current of
CMOS as well as the low noise and high ripple rejection
characteristics of bipolar LDO regulators. Moreover, only
one input capacitor is required.

Dropout Voltage: Typically 150mV at 150mA load, and
1mV at 1mA load.

Ground pin current: Typically 130µA at 1mA load, and
135µA at 150mA load.

Ripple Rejection: 55dB at 1kHz and 60dB at 100kHz.
Shutdown mode: Less than 0.5µA quiescent current in

shutdown mode.

Small package: MSOP-8
Small capacitor: Requires only a 0.47µF external capacitor

on the regulator output.

Precision output: Output voltage trimmed to 1% accuracy .
Output Noise: 80µV

RMS

, optional noise bypass capacitor

at pin 3 will further reduce noise on V

OUTA/B

Voltage Pairings available: 3.0/3.0V, 3.0/2.8V, 3.0/2.5V,

2.8/2.8V

Micropower Dual 150mA CMOS RF LDO™ Regulators
with 75dB Ripple Rejection

Impala Linear Cor poration

Impala Linear Corporation

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• Guaranteed 150mA output per regulator

• Ultra low 150mV dropout at 150mA

• 1% output voltage accuracy

• Requires only 0.47µF output capacitor

• Only 150µA ground current at 150mA load

• 60dB ripple rejection at 1kHz (C

OUT

= 0.47µF)

• 80µV

RMS

noise at BW = 300Hz to 50kHz

• Excellent line and load transient response

• Over current / over temperature protection

• 8-pin MSOP package

• -60dB cross talk

• Cellular Phones, pagers and wireless headsets

• Palmtops, organizers, PDAs and portable electronics

• Battery powered portable appliances and equipment

• Remote data accumulation and instrumentation

General Description

Features

Applications

Figure 1: Typical Application

Note: Enable may be connected to VIN,
C

NOISE

is common to both LDOs

ILC7280

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Pin Number

1
2
3
4

5

6

7

8

Pin Name

V

OUTA

GND

V

OUTB

C

NOISE (optional)

EN

B

V

INB

EN

A

V

INA

Pin Description

Regulator Output A
Ground
Regulator Output B
Voltage Reference Bypass: Connect external 22pF capacitor to GND to minimize

output noise in regulator “A” or “B.” May be left open. Do not ground.
Enable/Shutdown B (input): CMOS compatible input. Logic high = enable, logic low or

open = shutdown. Do not leave floating.
Supply Input B (Internally connected to pin 8)*
Enable/Shutdown A (Input): CMOS compatible input. Logic high = enable, logic low or

open = shutdown. Do not leave floating.
Supply Input A (Internally connected to pin 6)* Galvanic connection only.

C

NOISE(optional)

1

2

3

4

5

6

7

8

V

INA

EN

A

V

INB

EN

B

V

OUTB

GND

V

OUTA

MSOP

(TOP VIEW)

ILC7280CS-XXXX

Pin-Package Configurations

Pin Functions ILC7280

*If maximum current required from each regulator then connect both pin 6 and pin 8 to V

DD

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Parameter

Input Voltage
S/D Input Voltage

Output Current
Output Voltage
Power Dissipation
Maximum Junction Temperature
Storage Temperature
ESD Rating
Operating Input Voltage
Operating Ambient Temperature
Package Thermal Resistance

Symbol

V

IN

V

S/D

I

OUT

V

OUT

P

D

T

J(max)

T

stg

V

IN

T

A

θ

JA

Ratings

-0.3 to +12

-0.3 to V

IN

Short circuit protected

-0.3 to 10

Internally Limited

175

-40~+125
2

2.1 to 8

-40 to +85
200

Units

V

mA

V

mW

°C
°C

kV

V

°C

°C/W

Absolute Maximum Ratings (Note 1)

Micropower dual 150mA CMOS RF LDO™ Regulators with 75dB Ripple Rejection

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Parameter

Output Voltage

Output Voltage

Output Voltage

Line Regulation

Dropout Voltage (Note 3)

Dropout Voltage (Note 3)

Dropout Voltage (Note 3)

Ground Pin Current
One regulator on

Ground Pin Current
One regulator on

Ground Pin Current
One regulator on

Ground pin Current
Both regulator on

Ground pin Current
Both regulators on

Ground pin Current
Both regulators on

Shutdown Current

Symbol

V

OUT

V

OUT

V

OUT

∆VO/∆V

IN

VIN- V

OUT

V

IN

- V

OUT

VIN- V

OUT

I

GND

I

GND

I

GND

I

GND

I

GND

I

GND

I

S/D

Conditions

I

OUT

= 1mA

1mA < I

OUT

< 100mA

1mA < I

OUT

< 100mA

1mA < I

OUT

< 150mA

1mA < I

OUT

< 150mA

V

O(NOM)

+ 1V < VIN< 10V

I

OUT

= 0mA

I

OUT

= 10mA

I

OUT

=150mA

I

OUT

= 0mA

I

OUT

= 10mA

I

OUT

= 150mA

I

OUT

= 0mA

I

OUT

= 10mA

I

OUT

= 150mA

Min

-1

-2

-3

Typ

V

OUT

(Nom.)

V

OUT

(Nom.)

V

OUT

(Nom.)

0.007

0.1

10

150

90

100

135

105

115

150

0.1

Max

+1

+2

+3

0.014

0.032

1

2

15

20

175

200

1

Units

%V

(Nom.)

%V

(Nom.)

%V

(Nom.)

%/V

mV

mV

mV

µA

µA

µA

µA

µA

µA

µA

Electrical Characteristics ILC7280CS

Unless otherwise specified, all limits are at TA= 25°C; VIN= V

O(NOM)

+ 1V, I

OUT

= 1mA, C

OUT

= 0.47µF, V

S/D

= 2V.

Boldface limits apply over the operating temperature range. (Note 2)

Max

10

0.6

Typ

500

60
60

60
10

40
20

300

Micropower Dual 150mA CMOS RF LDO™ Regulators with 75dB Ripple Rejection

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Parameter

Shut Down Input Voltage

Peak Output Current (Note 4)
Output Noise Voltage (RMS)

Ripple Rejection

Dynamic Line Regulation

Dynamic Load Regulation

Short Circuit Current

Symbol

V

S/D

I

O(peak)

e

N

∆VO/∆V

IN

∆V

O(line)

∆V

O(load)

I

SC

Conditions

High = Regulator On
Low = Regulator Off

V

OUT

> 0.95V

O(NOM)

BW = 300Hz to 50kHz, C

NOISE

= 0pF

freq = 1kHz
freq = 10kHz

freq = 100kHz
VIN: V

O(NOM)

+ 1V to V

O(NOM)

+ 2V; dV

IN/dt

=

1V/

µS;lo

= 150mA

I

OUT

: 0 to 150mA; d(l

OUT

)/dt = 50A/µs, with

C

OUT

= 2.2µF

V

OUT

= 0V

Min

2.0

300

Units

V

mA

µV

dB

mV

mV

mA

Electrical Characteristics ILC7280CS

Unless otherwise specified, all limits are at TA= 25°C; VIN= V

O(NOM)

+ 1V, I

OUT

= 1mA, C

OUT

= 0.47µF, V

S/D

= 2V.

Boldface limits apply over the operating temperature range. (Note 2)

Note1: Absolute maximum ratings indicate limits which when exceeded may result in damage to the component. Electrical specifications do not apply

when operating the device outside of its rated operating conditions.
Note 2: Specified Min/Max limits are production tested or guaranteed through correlation based on statistical control methods. Measurements are

taken at constant junction temperature as close to ambient as possible using low duty pulse testing.
Note 3: Dropout Voltage is defined as the measured Differential Voltage between input and output voltage, when the output voltage drops 2% below the nominal output

voltage as V

IN

is decreased, and approaches V

OUT

. Nominal output voltage is defined at VIN= V

OUT

+ 1V.

Note 4: Guaranteed by design

Micropower Dual 150mA CMOS RF LDO™ Regulators with 75dB Ripple Rejection

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CURRENT LIMIT

THERMAL SHUTDOWN

-

+

V

OUTA

EN

A

V

INA

BANDGAP

REF.

V

OUTB

*C

NOISE

EN

B

V

INB

-

+

CURRENT LIMIT

THERMAL SHUTDOWN

GND

*Optional

Micropower Dual 150mA CMOS RF LDO™ Regulators with 75dB Ripple Rejection

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Output Capacitor

An output capacitor is required from V

OUTA

and V

OUTB

to

GND to prevent oscillation and minimize the effect of load
transient currents. The minimum size of the output capac­itor(s) is dependent on the usage of C

NOISE

and its value.

Without C

NOISE

, a minimum of 1µF is recommended. For

C

NOISE

= 22pF, a minimum of 2.2µF is recommended

(See figure 1). Larger values of output capacitance will
slow the regulator's response during power up. The upper
limit of capacitance is indefinite, however, it should have
an equivalent series resistance (ESR) of approximately
5Ω or less and a series resonance above 1MHz. Stability
is assured with the use of a capacitor having ultra-low
ESR and as such will not produce low amplitude oscilla­tions nor an underdamped transient response. This
allows the use of modern ceramic capacitors in prefer­ence to their more costly Tantalum counterparts.

If the system design calls for smaller load currents, lower
capacitance may be used. Below 10mA the capacitance
may be reduced to 0.47µF and below 1mA to 0.33µF.

No-Load Stability

The ILC7280 will remain stable and in regulation with no
load current. These are desirable performance features
for applications such as keep-alive modes in CMOS sys­tems.

Split-Supply Operation

When using the ILC7280 in a system requiring that the
load be returned to the negative voltage source, the out­put(s) must be diode clamped to inhibit significant volt­age excursions below ground. A simple external diode
clamp to ground will afford protection from damage to
the device. (See figure below).

APPLICATIONS INFORMATION

+V

IN

A and B

These pins are connected internally through a galvanic
connection for maximum power from each regulator, both
V

INA

and V

INB

must be connected externally to VDD.

Enable/Shutdown

Forcing EN

A

and/or ENBto a voltage greater than 2V,

enables the regulator(s). These inputs are CMOS logic
compatible gates. If this feature is not required, connect
EN

A

and/or ENBto VIN. Note that V

INA

and V

INB

are con-

nected internally. To minimize the effect of imbalanced
current sharing and possible noise, both V

INA

and V

INB

should also be connected externally.

Input Capacitor

A 1µF capacitor should be placed from V

INA/B

to GND if

there is more than 10 inches of wire between the input and
the ac filter capacitor or if a battery is used as the input.

Reference Bypass Capacitor

C

NOISE

(the reference voltage bypass capacitor) is con-

nected to the internal V

ref

which is common to regulator's

A and B. A 22pF capacitor connected between C

NOISE

and

GND decouples the reference output voltage and provides
a significant reduction in regulator output noise. An effect
of C

NOISE

also reduces the regulator phase margin. When

using C

NOISE

, output capacitors of 2.2µF or greater are

required to maintain stability.
Also affected by C

NOISE

is the start up speed of the ICL7280.

The speed is inversely proportional to the value of C

NOISE

. If

a slow or delayed start up time is desired, a larger value of
C

NOISE

is used. Conversely , faster start up times or instant-on

applications will require smaller values of C

NOISE

or its omis-

sion with the pin left open. The trade-off of noise to response
should be considered.

+V

IN

ENA/EN

B

-V

IN

ILC7280

Dual Regulator

V

OUTA

or V

OUTB

Dext

Rload

External Diode, Dext inhibits significant voltage excursions

below ground in a split power supply load return.

Micropower Dual 150mA CMOS RF LDO™ Regulators with 75dB Ripple Rejection

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Thermal Considerations

For optimum Thermal dissipation and device reliability,
devices mounted on conventional FR4 PCB material
should be surrounded and connected to as much ground
copper as possible. In a worse case application with min­imum trace widths and no ground plane, the MSOP-8
package exhibits a thermal resistance of 200 °C/W. The
risk to the device can be calculated in the following exam­ples. (An Excel spreadsheet calculator is also available at
the Impala Linear web site: Products/ILC7280.)

Thermal Evaluation Examples

For an ambient temperature of 50°C, the maximum pack­age power dissipation is:

P D(max) = (125°C - 50°C) / 200°C/W
P D(max) = 375mW
If the intent is to operate from a 4V power source with a
150mA load current from both outputs at a 50°C ambient
temperature, the expected power dissipation is found in
the following calculation:

P D(each regulator) = (V

IN

- V

OUT

) * I

OUT

+ (VIN* I

GND

)

P D(each regulator) = (4V - 3V) * 150mA + (4V * 0.12mA)
P D(each regulator) = 150mW
P D(both regulators) = 2 * 150mW
P D(both regulators) = 300mW

In this example the total power dissipated is 300mW which
is below the 375mW maximum package consideration and
therefore safe to operate. It should be noted that it is not
always possible to operate both regulators at the maximum
output current. For example in a 5V input and 3V output
application at 50°C, one regulator operating at 150ma
would dissipate 267.5mW. The remaining regulator must
be limited to 375mW - 267.5mW or 107.5mW.

An advantage of the ILC7280 low-dropout voltage charac­teristic is that using the lowest possible input voltage can
minimize power dissipation.

APPLICATIONS INFORMATION cont.

Micropower Dual 150mA CMOS RF LDO™ Regulators with 75dB Ripple Rejection

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Devices sold by Impala Linear Corporation are covered by the warranty and patent indemnification provisions appearing
in its Terms of Sale only. Impala Linear Corporation makes no warranty, express, statutory, implied, or by description
regarding the information set forth herein or regarding the freedom of the described devices from patent infringement.
Impala Linear Corporation makes no warranty of merchantability or fitness for any purpose. Impala Linear Corporation
reserves the right to discontinue production and change specifications and prices at any time and without notice.

This product is intended for use in normal commercial applications. Applications requiring an extended temperature
range, unusual environmental requirements, or high reliability applications, such as military and aerospace, are specif­ically not recommended without additional processing by Impala Linear Corporation.

Impala Linear Corporation assumes no responsibility for the use of any circuitry other than circuitry embodied in an
Impala Linear Corporation product. No other circuits, patents, licenses are implied.

Life Support Policy

Impala Linear Corporation’s products are not authorized for use as critical components in life support devices or systems.

1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or
(b) support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use pro­vided in the labeling, can be reasonably expected to result in a significant injury to the user.

2. A critical component is any component of a life support device or system whose failure to perform can be reason­ably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.

0.0215

0.037

3 TYP

0.006 RAD. TYP

0.116

12 TYP

12 TYP

0.118

0.000-0.005 RAD. TYP

0.040

0.004

SEATING PLANE

0.118 ± 0.004

0.020 TYP

0.013 TYP

0.0256 BSC

0.118 ± 0.004

All dimensions in inches

Package Dimensions

MSOP-8