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ILC7280
Micropower Dual 150mA CMOS RF LDOTM Regulators
Features
* * * * * * * * * * Low Power Consumption 150mV Dropout at 150mA 1% Output Voltage Accuracy Requires only 0.47F Output Capacitor Only 135A Ground Current at 150mA load 50VRMS 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
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. The ILC7280 is available in a space saving MSOP-8 package.
Applications
* * * * 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 *Optional - VOUTB
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ILC7280
PRODUCT SPECIFICATION
Pin Configuration
VOUTA GND VOUTB CNOISE
(Optional) 1 2 3 4 8 7 6 5
VINA ENA VINB ENB
MSOP-8
Pin Definitions
Pin Number 1 2 3 4 5 6 7 8 Pin Name VOUTA GND VOUTB CNOISE ENA VINB ENB VINA Ground of the IC Output B.Regulated voltage Optional bypass for noise reduction. Digital Input Enable for regulator A Supply input B.Internally connected to pin 8* Digital Input Enable for regulator B Supply input B.Internally connected to pin 6* Pin Function Description Output A.Regulated voltage
*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 Supply Voltage: VINA or VINB to GND Voltage on all other pin to GND Junction Temperature Storage Temperature Lead Soldering Temperature, 10 seconds Power Dissipation at 85C -0.3 -65 -65 Min. Max. 10 VIN + 0.3 150 150 300 315 Units V V C C C mW
Recommended Operating Conditions
Parameter Supply Voltage VDD Output Current Ambient Operating Temperature Conditions VINA or VINB to GND IOUT -40 Min. VOUT + VDO Typ. VOUT + 1V Max. 9 150 85 Units V mA C
2
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PRODUCT SPECIFICATION
ILC7280
Electrical Specifications
(All values are for each regulator at VIN=VOUTnom+1V, IOUT=1mA, COUT=0.47F, CN=0, VEN=2V and TA = +25C using Test circuit in Figure 1, unless otherwise noted.) Parameter Output Voltage Dropout Voltage Line Regulation Load Regulation Ground Pin Current One Regulator ON IOUT = 10mA IOUT = 150mA VOUT + 1V VIN VOUT + 2V IOUT: 1mA to 150mA IOUT = 0mA IOUT = 10mA IOUT = 150mA Ground Pin Current Both Regulators ON IOUT = 0mA IOUT = 10mA IOUT = 150mA OFF State Current Enable Input Current Shut Down Input Voltage Output Voltage Noise Ripple Rejection Dynamic Line Regulation VEN = 0V VOUT = 2V VOUT = 0.6 High = Regulator ON Low = Regulator OFF COUT = 2.2F, CN=1nF, IOUT = 10mA, BW = 300Hz to 50kHz COUT = 4.7F, f = 120Hz COUT = 4.7F, f = 1KHz VIN: VOUT + 1V to VOUT + 2V dV/dt = 1V/S 50 50 45 20 10 mV mV 2 0.6 Vrms dB Conditions Min. 0.99 VOUTnom Typ. VOUTnom 5.5 155 0.2 0.3 80 85 95 120 125 135 150 4 0.2 220 10 0.5 V nA A Max. 1.01 VOUTnom 7 180 0.5 0.75 105 110 125 A %/V % A Units V mV
Dynamic Load Regulation IOUT: 0 to 150mA DI/dt = 1A/S
VOUTA COUT
VINA ENA VINB COUT CN
Figure 1. Test Circuit
VIN CIN
VOUTB
ENB
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ILC7280
PRODUCT SPECIFICATION
Typical Applications Diagrams
Power Spectral Density and Output Noise Voltage Thermal Protection Under Short Circuit Conditions
COUT=2.2F 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=2.2F, CN=1nF
VOUT@ 100mA load COUT=2.2F CN=0
VEN
Ripple Rejection, Low Frequencies
Ripple Rejection, High Frequencies
COUT=4.7F Load=10mA
COUT=4.7F Load=10mA
4
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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 Pin Current, Both Regulators ON
350 300 250 200 150 100 50 0
Ground Current (A)
VOUTnom
150mA load
no load
0
1
2
3
4
5
6
7
8
9
10
Input Voltage (V)
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ILC7280
PRODUCT SPECIFICATION
Reference Voltage vs. Temperature
1.206 1.204 Reference Voltage,V 1.202 1.200 1.198 1.196 1.194 1.192 1.190 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 Temperature, C Dropout Voltage, mV 200 180 160 140 120 100 80 60 40 20 0 0
Dropout Voltage vs. IOUT
85C -40C
25C
50
100
150
Output Current, mA
6
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PRODUCT SPECIFICATION
ILC7280
Application Information
VIN A and B
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+.
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 protect the device from damage.
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.
Thermal Considerations
In order to minimize thermal resistance (JA), 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.
Input Capacitor
A 1F 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.
Reference Bypass Capacitor
CNOISE (the reference voltage bypass capacitor) may be connected to the internal VREF which is common to regulator's A and B. 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.
Thermal Evaluation Examples
The maximum allowed package power dissipation is: PD(max) =(TJmax-TA) / JA, where TJmax is the maximum junction temperature and TA is the ambient temperature. For an ambient temperature of 50C PD(max) = (150C - 50C) / 200C/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 50C ambient temperature, the expected power dissipation is found in the following calculation: 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.
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 0.47F is recommended. For CNOISE = 1nF, a minimum of 2.2F 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 10m. If the system design calls for smaller load currents, lower capacitance may be used. Below 10mA the capacitance may be reduced to 0.33F.
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PRODUCT SPECIFICATION
ILC7280
Mechanical Dimensions
MSOP-8
0.118 - 0.004 [3 0.1] 8
-A-
5
SYMM C
0.193 0.004 [4.9 0.1]
0.118 0.004 [3 0.1]
-B-
(0.189) [4.8] (0.040) TYP [1.02]
PIN 1 IDENT (0.016) TYP [0.41] 1 4 (0.0256) TYP [0.65] R 0.030 - 0.037 [0.78 - 0.94] (0.0256) TYP [0.65]
LAND PATTERN RECOMMENDATION 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 AS BS
(0.033) [0.84] 0.0375 [0.953]
0.021 0.005 [0.53 0.12]
0-6 TYP SEATING PLANE
0.007 0.002 TYP [0.18 0.05]
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ILC7280
PRODUCT SPECIFICATION
Ordering Information
Part Number ILC7280AR2530X ILC7280AR2830X ILC7280AR2828X ILC7280AR8585X ILC7280AR3030X ILC7280AR3333X VOUT 2.5V and 3.0V 3.0V and 2.8V 2.8V and 2.8V 2.85V and 2.85V 3.0V and 3.0V 3.3V and 3.3V Temperature Range (C) -40 to +85 -40 to +85 -40 to +85 -40 to +85 -40 to +85 -40 to +85 Package MSOP-8 MSOP-8 MSOP-8 MSOP-8 MSOP-8 MSOP-8
DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY 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. LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 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 (c) 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 of the user.
www.fairchildsemi.com 6/3/02 0.0m 002 Stock#DS30007280 2002 Fairchild Semiconductor Corporation
2. A critical component in 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.

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