Fairchild ILC7280AR2828X Micropower dual 150ma cmos rf ldo-tm regulator Datasheet

www.fairchildsemi.com
ILC7280
Micropower Dual 150mA CMOS RF LDO™
Regulators
Features
General Description
•
•
•
•
•
•
•
•
•
•
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 offered by CMOS technology as well as the low
noise and good ripple rejection characteristics of bipolar
LDO regulators.
Low Power Consumption
150mV Dropout at 150mA
1% Output Voltage Accuracy
Requires only 0.47µF Output Capacitor
Only 135µA Ground Current at 150mA load
50µVRMS Noise at BW = 300Hz to 50kHz
Excellent Line and Load Transient Response
Over Current/Over Temperature Protection
8-pin MSOP package
Voltage Options Available: 3.3/3.3V, 3.0/3.0V, 3.0/2.8V,
3.0/2.5V, 2.8/2.8V, 2.85/2.85V. Other Custom Values
available upon request.
• Minimum External Components
The ILC7280 is available in a space saving MSOP-8
package.
Applications
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•
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Cellular Phones, pagers and wireless headsets
Palmtops, organizers, PDAs and portable electronics
Battery powered portable appliances and equipment
Remote data accumulation and instrumentation
Block Diagram
VINA
VOUTA
–
+
ENA
Current Limit
Thermal Shutdown
*CNOISE
Bandgap
Reference
GND
Current Limit
Thermal Shutdown
ENB
+
–
VINB
VOUTB
*Optional
REV. 1.0.5 6/3/02
ILC7280
PRODUCT SPECIFICATION
Pin Configuration
VOUTA
1
8
VINA
GND
2
7
ENA
VOUTB
3
6
VINB
CNOISE
4
5
ENB
(Optional)
MSOP-8
Pin Definitions
Pin Number
Pin Name
Pin Function Description
1
VOUTA
Output A.Regulated voltage
2
GND
Ground of the IC
3
VOUTB
Output B.Regulated voltage
4
CNOISE
Optional bypass for noise reduction.
5
ENA
Digital Input Enable for regulator A
6
VINB
Supply input B.Internally connected to pin 8*
7
ENB
Digital Input Enable for regulator B
8
VINA
Supply input B.Internally connected to pin 6*
*If maximum current is required from each regulator, then connect both pin 6 and 8 to power supply.
Absolute Maximum Ratings
Absolute maximum ratings are the values beyond which the device may be damaged or have its useful life
impaired. Functional operation under these conditions is not implied.
Parameter
Min.
Supply Voltage: VINA or VINB to GND
Max.
Units
10
V
Voltage on all other pin to GND
–0.3
VIN + 0.3
V
Junction Temperature
–65
150
°C
Storage Temperature
–65
150
°C
Lead Soldering Temperature, 10 seconds
300
°C
Power Dissipation at 85°C
315
mW
Recommended Operating Conditions
Parameter
Supply Voltage VDD
Output Current
Ambient Operating Temperature
2
Conditions
VINA or VINB to GND
Min.
VOUT + VDO
IOUT
-40
Typ.
VOUT + 1V
Max.
9
Units
V
150
mA
85
°C
REV. 1.0.5 6/3/02
PRODUCT SPECIFICATION
ILC7280
Electrical Specifications
(All values are for each regulator at VIN=VOUTnom+1V, IOUT=1mA, COUT=0.47µF, CN=0, VEN=2V and TA = +25°C
using Test circuit in Figure 1, unless otherwise noted.)
Parameter
Conditions
Min.
Typ.
Max.
Units
0.99
VOUTnom
VOUTnom
1.01
VOUTnom
V
IOUT = 10mA
5.5
7
mV
Output Voltage
Dropout Voltage
IOUT = 150mA
155
180
Line Regulation
VOUT + 1V ≤ VIN ≤ VOUT + 2V
0.2
0.5
%/V
Load Regulation
IOUT: 1mA to 150mA
0.3
0.75
%
Ground Pin Current
One Regulator ON
IOUT = 0mA
80
105
µA
IOUT = 10mA
85
110
IOUT = 150mA
95
125
Ground Pin Current
Both Regulators ON
IOUT = 0mA
120
IOUT = 10mA
125
IOUT = 150mA
135
VEN = 0V
150
OFF State Current
Enable Input Current
Shut Down Input Voltage
µA
220
nA
µA
VOUT = 2V
4
10
VOUT = 0.6
0.2
0.5
High = Regulator ON
2
V
Low = Regulator OFF
0.6
Output Voltage Noise
COUT = 2.2µF, CN=1nF,
IOUT = 10mA, BW = 300Hz to 50kHz
50
µVrms
Ripple Rejection
COUT = 4.7µF, f = 120Hz
50
dB
COUT = 4.7µF, f = 1KHz
45
VIN: VOUT + 1V to VOUT + 2V
dV/dt = 1V/µS
20
mV
10
mV
Dynamic Line Regulation
Dynamic Load Regulation IOUT: 0 to 150mA
DI/dt = 1A/µS
VINA
VOUTA
COUT
ENA
VINB
VOUTB
COUT
VIN
CIN
CN
ENB
Figure 1. Test Circuit
REV. 1.0.5 6/3/02
3
ILC7280
PRODUCT SPECIFICATION
Typical Applications Diagrams
Power Spectral Density and Output Noise Voltage
Thermal Protection Under Short Circuit Conditions
COUT=2.2µF
CNOISE=1nF
Load=10mA
BW=300Hz to 50kHz
Isc(0.5A/div)
ON/OFF Response, One Regulator ON
ON/OFF Response, Both Regulators ON
VEN
VOUT@ 10mA load,
COUT=2.2µF, CN=1nF
VOUT@
100mA load
COUT=2.2µF
CN=0
Ripple Rejection, Low Frequencies
COUT=4.7µF
Load=10mA
4
VEN
Ripple Rejection, High Frequencies
COUT=4.7µF
Load=10mA
REV. 1.0.5 6/3/02
PRODUCT SPECIFICATION
ILC7280
Ripple Rejection, Low Frequencies, 150mA Load
Ripple Rejection, High Frequencies, 150mA Load
Line Transient Response, 10mA Load
Load Transient Response
VIN
VOUT(AC)
ILOAD (0.1A/div)
VOUT(AC)
Ground Current (µA)
Ground Pin Current, Both Regulators ON
350
300
250
200
150
100
50
0
VOUTnom
no load
150mA load
0
1
2
3
4
5
6
7
8
9
10
Input Voltage (V)
REV. 1.0.5 6/3/02
5
ILC7280
PRODUCT SPECIFICATION
1.206
200
1.204
180
160
140
120
1.202
1.200
1.198
1.196
1.194
1.192
1.190
-40 -30 -20 -10 0
85°C
100
80
25°C
-40°C
60
40
20
10 20 30 40 50 60 70 80 90
Temperature, °C
6
Dropout Voltage vs. IOUT
Dropout Voltage, mV
Reference Voltage,V
Reference Voltage vs. Temperature
0
0
50
100
150
Output Current, mA
REV. 1.0.5 6/3/02
PRODUCT SPECIFICATION
ILC7280
Application Information
No-load Stability
VIN A and B
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.
These pins are connected internally through a galvanic
connection. For maximum power from each regulator, both
VINA and VINB must be connected externally to V+.
Enable/Shutdown
Forcing ENA and/or ENB to a voltage greater than 2V,
enables the regulator(s). These inputs are CMOS logic
compatible gates. If this feature is not required, connect
ENAand/or ENB to VIN. Note that VINA and VINB are
connected internally. To minimize the effect of imbalanced
current sharing and possible noise, both VINA and VINB
should also be connected externally.
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
protect the device from damage.
Thermal Considerations
A 1µF capacitor should be placed from VINA/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.
In order to minimize thermal resistance (θJA), the device
mounted on conventional FR4 PCB material should be
surrounded as much ground copper ground plane as
possible. In a worst case application with minimum trace
widths and no ground plane, the MSOP-8 package exhibits a
thermal resistance of 200 °C/W. The maximum allowable
power dissipation is calculated in the following examples.
Reference Bypass Capacitor
Thermal Evaluation Examples
CNOISE (the reference voltage bypass capacitor) may be
connected to the internal VREF which is common to regulator’s A and B.
The maximum allowed package power dissipation is:
Input Capacitor
For low noise applications use of 1nF CNOISE is recommended. Value higher than 1nF will lead to minimum
improvement of output noise, but it will substantially
increase the start-up time. Lower value of CNOISE results in
faster start –up. If a slow or delayed start up time is desired,
a larger value of CNOISE is used. Conversely, faster start up
times or instant-on applications will require smaller values
of CNOISE or its omission with the pin left open. The tradeoff of noise to response time should be considered.
PD(max) =(TJmax–TA) / θJA, where TJmax is the maximum
junction temperature and TA is the ambient temperature.
For an ambient temperature of 50°C
PD(max) = (150°C - 50°C) / 200°C/W
PD(max) = 500mW
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:
Output Capacitor
An output capacitor is required from VOUTA and VOUTB 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 CNOISE and its value.
Without CNOISE, a minimum of 0.47µF is recommended.
For CNOISE = 1nF, a minimum of 2.2µF is recommended.
Larger values of output capacitance will slightly slow the
regulator’s response during power up. The ILC7280 remains
stable even with ESR values as low as 10mΩ.
PD (each regulator) = (VIN – VOUT) * IOUT + (VIN * IGND)
PD (each regulator) = (4V – 3V) * 150mA + (4V * 0.12mA)
PD (each regulator) = 150mW
PD (both regulators) = 2 * 150mW
PD (both regulators) = 300mW
In this example the total power dissipated is 300mW which
is below the 500mW 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.
If the system design calls for smaller load currents, lower
capacitance may be used. Below 10mA the capacitance may
be reduced to 0.33µF.
REV. 1.0.5 6/3/02
7
PRODUCT SPECIFICATION
ILC7280
Mechanical Dimensions
MSOP-8
0.118 - 0.004
[3 ± 0.1]
8
–A–
SYMM
C
5
(0.189)
[4.8]
0.118 ± 0.004
[3 ± 0.1]
0.193 ± 0.004
[4.9 ± 0.1]
–B–
(0.040)
TYP
[1.02]
PIN 1
IDENT
(0.016)
TYP
[0.41]
1
4
LAND PATTERN RECOMMENDATION
(0.0256) TYP
[0.65]
R
0.030 - 0.037
[0.78 - 0.94]
(0.0256)
TYP
[0.65]
0.005
TYP
[0.13]
R
0.005
TYP
[0.13]
GAGE
PLANE
(0.010)
[0.23]
–C–
0.002 [0.05]
C
0.002 - 0.006
TYP
[0.06 - 0.15]
0.012 ± 0.002
TYP
[0.3 ± 0.05]
0.002 [0.05]
M
0.021 ± 0.005
[0.53 ± 0.12]
(0.033)
[0.84]
A S
B S
0.0375
[0.953]
0°–6° TYP
SEATING PLANE
0.007 ± 0.002
TYP
[0.18 ± 0.05]
REV. 1.0.5 6/3/02
8
ILC7280
PRODUCT SPECIFICATION
Ordering Information
Part Number
VOUT
Temperature Range (°C)
Package
ILC7280AR2530X
2.5V and 3.0V
-40 to +85
MSOP-8
ILC7280AR2830X
3.0V and 2.8V
-40 to +85
MSOP-8
ILC7280AR2828X
2.8V and 2.8V
-40 to +85
MSOP-8
ILC7280AR8585X
2.85V and 2.85V
-40 to +85
MSOP-8
ILC7280AR3030X
3.0V and 3.0V
-40 to +85
MSOP-8
ILC7280AR3333X
3.3V and 3.3V
-40 to +85
MSOP-8
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LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER
DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.
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