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Advanced Monolithic Systems
FEATURES
* Fast Transient Response * Dropout Voltage Defined by FET Used * Very Tight Load Regulation * High Side Sense Current Limit
AMS2115
FAST TRANSIENT RESPONSE LOW DROPOUT REGULATOR
APPLICATIONS
* Microprocessor Supplies * Video Card Supplies * Low Voltage Logic Supplies * GTL Termination
GENERAL DESCRIPTION
The AMS2115 is a single IC controller that drives an external N channel MOSFET as a source follower to produce a fast The transient response, low dropout voltage regulator. The fast transient load performance is obtained by eliminating expensive tantalum or bulk electrolytic output capacitors in the most demanding modern microprocessor applications. Precision-trimmed adjustable and fixed output voltage versions accommodate any required microprocessor power supply voltage. By selecting the N-channel MOSFET RDS(ON) a very low dropout voltage can be achieved. A protection feature includes a high side current limit amplifier that activates a circuit to limit the FET gate drive. A shutdown pin turns off the gate drive and some internal circuits to reduce quiescent current. AMS2115 is offered in 8L SOIC and 8L PDIP package.
ORDERING INFORMATION:
PACKAGE TYPE 8L PDIP AMS2115P AMS2115P-1.5 AMS2115P-1.8 AMS2115P-2.5 AMS2115P-3.3 AMS2115P-5.0 8L SOIC AMS2115S AMS2115S-1.5 AMS2115S-1.8 AMS2115S-2.5 AMS2115S-3.3 AMS2115S-5.0 OPERATING JUNCTION 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
S/D VIN GND FB
1 2 3 4
8L SOIC 8L PDIP
8 7 6 5
IPOS INEG GATE COMP
Top View
TYPICAL APPLICATION:
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Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS2115
ABSOLUTE MAXIMUM RATINGS (Note 1)
Input Voltage Operating Junction Temperature Range ESD Storage temperature 20V 0C to 125C 2000V - 65C to +150C Soldering information Lead Temperature (10 sec) Thermal Resistance SO-8 package 8L-PDIP package 300C JA= 130C/W JA= 100C/W
ELECTRICAL CHARACTERISTICS
Parameter
Supply Current Reference Voltage Output Voltage Output Voltage Output Voltage Output Voltage Output Voltage Line Regulation Input Bias Current OUT Divider Current Gate Output Swing Low Gate Output Swing High IPOS + INEG Supply Current Current Limit Threshold Voltage Current Limit Threshold Voltage Line Regulation Shut Down Current (Input Shut Down - High) Shut Down Input logic (Shut Down - Low) Shut Down Input logic (Shut Down - High) Shut Down Hysteresis Output Voltage TC Reference Voltage TC (VOUT TC) (VREF TC) (Ifb) (Isy) (VREF) (VOUT) (VOUT) (VOUT) (VOUT) (VOUT) AMS2115 AMS2115-1.5 AMS2115-1.8 AMS2115-2.5 AMS2115-3.3 AMS2115-5.0 AMS2115-XX AMS2115 AMS2115-XX AMS2115-XX AMS2115-XX AMS2115-XX AMS2115-XX AMS2115-XX AMS2115-XX AMS2115-XX AMS2115-XX AMS2115-XX AMS2115-XX AMS2115
TA = 25C, V IN = 12V, IPOS = INEG = 5V, SHDN = 0V unless otherwise noted. Device Conditions Min
1.238 1.485 1.782 2.475 3.267 4.950 10 V VIN 20V FB = VFB OUT = VOUT I Gate = 0mA I Gate = 0mA 3V IPOS 20V VIN - 1.6 0.3 42 37 3V IPOS 20V V Shutdown = 2.0 V Low (Regulator On) High (Regulator Off) From High To Low T = TA to 125C T = TA to 125C 2.0
Typ
4.5 1.250 1.500 1.0 1.800 2.500 3.300 5.000 0.01 -3.0 0.5 0.1 VIN - 1 0.625 50 50 -0.20 5.0 1.2 1.5 150 30 30
Max
7 1.26 1.51 5 1.81 2.52 3.33 5.05 0.3 -4.0 1.0 0.5
Units
mA V V V V V V V %/V A mA V V 1.0 58 63 -0.50 8.0 1.4 mA mV mV %/V A V V mV ppm/C ppm/C
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: Line regulation is guaranteed up to the maximum input voltage. Note 3: XX represents all output voltages.
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS2115
PIN FUNCTIONS
S/D (Pin 1) This is a shutdown pin that provides GATE drive latchoff capability. The pin is also the input to a comparator referenced to VREF (1.25V). When the pin pulls above VREF, the comparator latches the gate drive to the external MOSFET off. The comparator typically has 150mV of hysteresis and the Shutdown pin can be pulled low to reset the latchoff function. This pin provides overvoltage protection or thermal shutdown protection when driven from various resistor divider schemes. S/D pin is clamped at 2.5V. VIN (Pin 2) This is the input supply for the IC that powers the majority of internal circuitry and provides sufficient gate drive compliance for the external N-channel MOSFET. The typical supply voltage is 12 with 4.5 mA of quiescent current. The maximum operating VIN is 20V and the MOSFET at max. IOUT + 1.6V (worst-case VIN to GATE output swing). GND (Pin 3) Analog Ground. This pin is also the negative sense terminal for the internal 1.25V reference. Connect external feedback divider networks that terminate to GND and frequency compensation components that terminate to GND directly to this pin for best regulation and performance. FB (Pin 4) Adjustable Version This is the inverting input of the error amplifier for the adjustable voltage AMS 2115. The noninverting input is tied to the internal 1.25V reference. Input bias current for this pin is typically - 3 A flowing out of the pin. This pin is normally tied to a resistor divider network to set output voltage. Tie the top of the external resistor divider directly to the output voltage for best regulation performance. OUT (Pin 4) Fixed Output Voltage This is the input of the error amplifier for the fixed voltage AMS 2115-X. The fixed voltage parts contain a precision resistor divider network to set output voltage. The typical resistor divider current is 1 mA into the pin. Tie this pin directly to the output voltage for best regulation performance. COMP (Pin 5) This is the high impedance gain node of the error amplifier and is used for external frequency compensation. Frequency compensation is generally performed with a series RC network to ground. GATE (Pin 6) This is the output of the error amplifier that drives N-channel MOSFETs with up to 5000pf of "effective" gate capacitance. The typical open-loop output impedance is 2. When using low input capacitance MOSFETs (,1500pF), a small gate resistor of 2 to 10 dampens high frequency ringing created by an LC resonance that is created by the MOSFET gate's lead inductance and input capacitance. The GATE pin delivers up to 50mA for a few hundred nanoseconds when slewing the gate of the N-channel MOSFET in response to output load current transients. INEG (Pin 7) This is the negative sense terminal of the current limit amplifier. A small sense resistor is connected in series with the drain of the external MOSFET and is connected between the IPOS and INEG pins. A 50mV threshold voltage in conjunction with the sense resistor value sets the current limit level. The current sense resistor can be low value shut or can be made from a piece of PC board trace. If the current limit amplifier is not used tie the INEG and IPOS to power input voltage. This action disables the current limit amplifier. IPOS (Pin 8) This is the positive sense terminal of the current limit amplifier. Tie this pin directly to the main power input voltage from which the output voltage is regulated. This pin is also the input to a comparator that monitors the power input voltage and keeps the GATE voltage low until power input voltage is at least 1V. This prevents the external N Channel MOSFET to turn on before V power is on thus eliminating possible voltage spikes in the output voltage when powered up.
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS2115
PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted.
8 LEAD SOIC PLASTIC PACKAGE (S)
0.189-0.197* (4.801-5.004) 8 7 6 5
0.228-0.244 (5.791-6.197)
0.150-0.157** (3.810-3.988)
1
2
3
4
0.053-0.069 (1.346-1.752)
0.010-0.020 x 45 (0.254-0.508) 0.004-0.010 (0.101-0.254) 0.008-0.010 (0.203-0.254) 0-8 TYP
0.014-0.019 (0.355-0.483)
0.050 (1.270) TYP
0.016-0.050 (0.406-1.270)
S (SO-8 ) AMS DRW# 042293
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
8 LEAD PLASTIC DIP PACKAGE (P)
0.400* (10.160) MAX 8 7 6 5
0.2550.015* (6.4770.381)
1
2
3
4
0.045-0.065 (1.143-1.651)
0.1300.005 (3.3020.127)
0.300-0.325 (7.620-8.255)
0.065 (1.651) TYP 0.005 (0.127) MIN 0.1000.010 (2.5400.254)
0.125 (3.175) MIN 0.0180.003 (0.4570.076)
0.009-0.015 (0.229-0.381) 0.015 (0.380) MIN 0.325 +0.025 -0.015 (8.255 +0.635 ) -0.381
P (8L PDIP ) AMS DRW# 042294
*DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTUSIONS. MOLD FLASH OR PROTUSIONS SHALL NOT EXCEED 0.010" (0.254mm)
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723

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