Advanced Monolithic Systems
FEATURES
AMS1505V
5A ULTRA LOW DROPOUT VOLTAGE REGULATORS
APPLICATIONS
• High Speed Video/Graphic Cards • Post Regulators for Switching Supplies • Microprocessor Supply • Adjustable Power Supply • Notebook/Personal Computer Supplies • High Current Regulators
• Adjustable or Fixed Output 1.5V, 2.5V, 2.85V, 3.0V, 3.3V, 3.5V and 5.0V • Output Current of 5A • Low Dropout, 350mV max. at 5A Output Current • Fast Transient Response • Remote Sense
GENERAL DESCRIPTION
The Designed specially for video applications where a very low dropout is critical, the AMS1505V series of adjustable and fixed low dropout voltage regulators provide 5A output current to power the new generation of high speed video cards. The dropout voltage of the device is 200mV max. at 3A loads and rising to 350mV at maximum output current. A second low current input voltage 1V or greater then the output voltage is required to achieve this dropout. New features have been added to the AMS1505V: a remote Sense pin is brought out virtually eliminating output voltage variations due to load changes. The typical load regulation, measured at the Sense pin, for a load current step of 100mA to 5A is less than 1mV. The AMS1505V series has fast transient response. To further improve the transient response the addition of a small capacitor on the Adjust pin is recommended. The AMS1505V series are ideal for generating supplies of 2V to 3V on boards where both 5V and 3.3V supplies are available. The AMS1505V devices are offered in 5 lead TO-220 and TO-263 (plastic DD) packages.
ORDERING INFORMATION: PIN CONNECTIONS
PACKAGE TYPE 5 LEAD TO-263 AMS1505CMV AMS1505CMV-1.5 AMS1505CMV-2.5 AMS1505CMV-2.85 AMS1505CMV-3.0 AMS1505CMV-3.3 AMS1505CMV-3.5 AMS1505CMV-5.0 5 LEAD TO-220 AMS1505CTV AMS1505CTV-1.5 AMS1505CTV-2.5 AMS1505CTV-2.85 AMS1505CTV-3.0 AMS1505CTV-3.3 AMS1505CTV-3.5 AMS1505CTV-5.0 OPERATING TEMPERATURE RANGE 0 to 125° C 0 to 125° C 0 to 125° C 0 to 125° C 0 to 125° C 0 to 125° C 0 to 125° C 0 to 125° C
5 LEAD TO-220
5 4 3 2 1 VPOWER VCONTROL OUTPUT ADJUST/GND SENSE
FRONT VIEW
5 LEAD TO-263
5 4 3 2 1 Vpower Vcontrol OUTPUT ADJUST/GND SENSE
FRONT VIEW
Advanced Monolithic Systems, Inc.
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS1505V
ABSOLUTE MAXIMUM RATINGS (Note 1)
VPOWER Input Voltage 7V VCONTROL Input Voltage 13V Operating Junction Temperature Range Control Section 0°C to 125°C Power Transistor 0°C to 150°C Storage temperature - 65°C to +150°C Soldering information Lead Temperature (10 sec) Thermal Resistance TO-220 package TO-263 package 300°C ϕ JA= 50°C/W ϕ JA= 30°C/W*
* With package soldering to 0.5in2 copper area over backside ground plane or internal power plane ϕ JA can vary from 20°C/W to >40°C/W depending on mounting technique.
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at ILOAD = 0 mA, and TJ = +25°C unless otherwise specified. Parameter
Reference Voltage
Device
AMS1505V
Conditions
VCONTROL = 2.75V, VPOWER =2V, ILOAD = 10mA VCONTROL = 2.7V to 12V, VPOWER =3.3V to 5.5V, ILOAD = 10mA to 5A VCONTROL = 4V, VPOWER =2.V, ILOAD = 0mA VCONTROL = 3V, VPOWER =2.3V, ILOAD = 0mA to 5A VCONTROL = 5V, VPOWER =3.3V, ILOAD = 0mA VCONTROL = 4V, VPOWER =3.3V, ILOAD = 0mA to 5A VCONTROL = 5.35V, VPOWER =3.35V, ILOAD = 0mA VCONTROL = 4.4V, VPOWER =3.7V, ILOAD = 0mA to 5A VCONTROL = 5.5V, VPOWER =3.5V, ILOAD = 0mA VCONTROL = 4.5V, VPOWER =3.8V, ILOAD = 0mA to 5A VCONTROL = 5.8V, VPOWER =3.8V, ILOAD = 0mA VCONTROL = 4.8V, VPOWER =4.1V, ILOAD = 0mA to 5A VCONTROL = 6V, VPOWER =4V, ILOAD = 0mA VCONTROL = 5V, VPOWER =4.3V, ILOAD = 0mA to 5A VCONTROL = 7.5V, VPOWER =5.5V, ILOAD = 0mA VCONTROL = 6.5V, VPOWER =5.8V, ILOAD = 0mA to 5A ILOAD = 10 mA , 1.5V≤ (VCONTROL - VOUT) ≤ 12V 0.8V≤ (VPOWER - VOUT) ≤ 5.5V VCONTROL = VOUT + 2.5V, VPOWER =VOUT + 0.8V, ILOAD = 10mA to 5A VCONTROL = 5V, VPOWER =3.3V, VADJ = 0V (Note 3) VCONTROL = VOUT + 2.5V, VPOWER =VOUT + 0.8V, ILOAD = 10mA to 5A VCONTROL = VOUT + 2.5V, VPOWER =VOUT + 0.8V, ILOAD = 10mA to 5A VCONTROL = 2.75V, VPOWER = 2.05V, ILOAD = 10mA VCONTROL = VPOWER = VOUT + 2.5V, VRIPPLE = 1VP-P ILOAD = 2A TA = 25°C, 30ms pulse T Package: Control Circuitry/ Power Transistor M Package: Control Circuitry/ Power Transistor
Min
1.238
Typ
1.250
Max
1.262
Units
V
Output Voltage
AMS1505V-1.5
1.485
1.500
1.515
V
AMS1505V-2.5 AMS1505V-2.85 AMS1505V-3.0 AMS1505V-3.3 AMS1505V-3.5 AMS1505V-5.0 Line Regulation AMS1505V/-1.5/-2.5/ -2.85/-3.0/-3.3/-3.5/-5.0 Load Regulation AMS1505V/-1.5/-2.5/ -2.85/-3.0/-3.3/-3.5/-5.0 Minimum Load Current Control Pin Current (Note 4) Ground Pin Current (Note 4) Adjust Pin Current Ripple Rejection AMS1505V AMS1505V/-1.5/-2.5/ -2.85/-3.0/-3.3/-3.5/-5.0 AMS1505V/-1.5/-2.5/ -2.85/-3.0/-3.3/-3.5/-5.0 AMS1505V AMS1505V/-1.5/-2.5/ -2.85/-3.0/-3.3/-3.5/-5.0 Thermal Regulation Thermal Resistance Junction-to-Case AMS1505V
2.475 2.833 2.970 3.235 3.430 4.950
2.500 2.850 3.000 3.300 3.500 5.000 1
2.525 2.867 3.030 3.333 3.535 5.030 3
V V V V V V mV
1
5
mV
5 50
10 85
mA mA
6
10
mA
50 60 80
120
µA dB
0.002
0.020 0.65/2.70 0.65/2.70
%W °C/W °C/W
Advanced Monolithic Systems, Inc.
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS1505V
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at IOUT = 0 mA, and TJ = +25°C unless otherwise specified. Parameter
Dropout Voltage Control Dropout (VCONTROL - VOUT) Power Dropout (VPOWER - VOUT) AMS1505V/-1.5/-2.5/ -2.85/-3.0/-3.3/-3.5/-5.0 AMS1505V/-1.5/-2.5/ -2.85/-3.0/-3.3/-3.5/-5.0
Device
Conditions
Note 2 VPOWER =VOUT + 0.8V, ILOAD = 10mA VPOWER =VOUT + 0.8V, ILOAD = 5A VCONTROL =VOUT + 2.5V, ILOAD = 3A VCONTROL =VOUT + 2.5V, ILOAD = 5A
Min
Typ
Max
Units
1.00 1.15 175 300
1.20 1.30 200 350
V V mV mV
Parameters identified with boldface type apply over the full operating temperature range. Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Note 2: Unless otherwise specified VOUT = VSENSE. For the adjustable device VADJ = 0V. Note 3: The dropout voltage for the AMS1505V is caused by either minimum control voltage or minimum power voltage. The specifications represent the minimum input/output voltage required to maintain within 1% regulation. Note 4: For the adjustable device the minimum load current is the minimum current required to maintain regulation. Normally the current in the resistor divider used to set the output voltage is selected to meet the minimum load current requirement. Note 5: The control pin current is the drive current required for the output transistor. This current will track output current with a ratio of about 1:100. The minimum value is equal to the quiescent current of the device.
PIN FUNCTIONS
Sense (Pin 1): This pin is the positive side of the reference voltage for the device. With this pin it is possible to Kelvin sense the output voltage at the load. Adjust/Ground (Pin 2): This pin is the negative side of the reference voltage for the device. Adding a small bypass capacitor from the Adjust pin to ground improves the transient response. Output (Pin 3): This is the power output of the device. VCONTROL (Pin 4): This pin is the supply pin for the control circuitry of the device. The current flow into this pin will be about 1% of the output current. The voltage at this pin must be 1.3V or greater than the output voltage for the device to regulate. VPOWER (Pin 5): This pin is the collector to the power device of the AMS1505V. The output load current is supplied through this pin. The voltage at this pin must be between 0.1V and 0.35V greater than the output voltage for the device to regulate.
Advanced Monolithic Systems, Inc.
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS1505V
APPLICATION HINTS
The AMS1505V series of adjustable and fixed regulators are designed to power the new generation of microprocessors. The AMS1505V is designed to make use of multiple power supplies, existing in most systems, to reduce the dropout voltage. One of the advantages of the two supply approach is maximizing the efficiency. The second supply is at least 0.35V greater than output voltage and is providing the power for the control circuitry and supplies the drive current to the NPN output transistor. This allows the NPN to be driven into saturation; thereby reducing the dropout voltage by a VBE compared to conventional designs. For the control voltage the current requirement is small equal to about 1% of the output current or approximately 50mA for a 5A load. Most of this current is drive current for the NPN output transistor. This drive current becomes part of the output current. The maximum voltage on the Control pin is 13V. The maximum voltage at the Power pin is 7V. Ground pin current for fixed voltage devices is typical 6mA and is constant as a function of load. Adjust pin current for adjustable devices is 60µA at 25°C and varies proportional to absolute temperature. The improved frequency compensation of AMS1505V permits the use of capacitors with very low ESR. This is critical in addressing the needs of modern, low voltage high sped microprocessors. The new generation of microprocessors cycle load current from several hundred mA to several A in tens of nanoseconds. Output voltage tolerances are tighter and include transient response as part of the specification. Designed to meet the fast current load step requirements of the video-processors, the AMS1505V also saves total cost by needing less output capacitance to maintain regulation. Careful design of the AMS1505V has eliminated any supply sequencing issues associated with a dual supply system. The output voltage will not turn on until both supplies are operating. If the control vo
