|Description||Synchronous Switching /Linear Regulator Controller|
|Datasheet||Download ADP3153 datasheet
FEATURES 5-Bit Digitally Programmable 3.5 V Output Voltage Dual N-Channel Synchronous Driver Total Output Accuracy to +70C) High Efficiency Current-Mode Operation Short Circuit Protection Power Good Output Overvoltage Protection Crowbar On-Board Linear Regulator Controller VRM 8.2 Compatible Narrow Body TSSOP 20-Lead Package APPLICATIONS Desktop PC Power Supply for: Pentium II Processor Deschutes Processor Pentium Pro Processor Pentium Processor AMDK6 Processor VRM Modules5-Bit Programmable Dual Power Supply Controller for Pentium® II Processor ADP3153
The is a highly efficient synchronous switching regulator controller and a linear regulator controller. The switching regulator controller is optimized for Pentium II and Deschutes Processor applications where V is stepped down to a digitally controlled output voltage between 1.8 V and 3.5 V. Using a 5-bit DAC to read a voltage identification (VID) code directly from the processor, the ADP3153 uses a current mode constant offtime architecture to generate its precise output voltage. The ADP3153 drives two N-channel MOSFETS in a synchronous rectified buck converter, at a maximum switching frequency of 250 kHz. Using the recommended loop compensation and guidelines, the ADP3153 provides a dc/dc converter that meets Intel's stringent transient specifications with a minimum number of output capacitors and smallest footprint. Additionally, the current mode architecture also provides guaranteed short circuit protection and adjustable current limiting. The ADP3153's linear regulator controller drives an external N-channel device. The output voltage is set by the ratio of the external feedback resistors. The controller has been designed for excellent load transient response.
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Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 1998
Parameter OUTPUT ACCURACY 1.8 V Output Voltage 2.8 V Output Voltage 3.5 V Output Voltage OUTPUT VOLTAGE LINE REGULATION OUTPUT VOLTAGE LOAD REGULATION INPUT DC SUPPLY CURRENT Normal Mode Shutdown
Conditions With Respect to Nominal Output Voltage (Figure 1) ILOAD 10 A (Figure 2) VIN 5.25 V (Figure mA < ILOAD 14 A VSD = +25°C, VSD V V10 Forced to VOUT 3%
CURRENT SENSE THRESHOLD VOLTAGE VID PINS THRESHOLD Low High VID PINS INPUT CURRENT VID0VID4 PULL-UP RESISTANCE CT PIN DISCHARGE CURRENT
VID = +25°C VOUT in Regulation VOUT 7000 pF (Pins +25°C % Above Output Voltage % Below Output Voltage 8 1.8
OFFTIME DRIVER OUTPUT TRANSITION TIMES POSITIVE POWER GOOD TRIP POINT NEGATIVE POWER GOOD TRIP POINT POWER GOOD RESPONSE TIME CROWBAR TRIP POINT ERROR AMPLIFIER OUTPUT IMPEDANCE ERROR AMPLIFIER TRANSCONDUCTANCE ERROR AMPLIFIER MINIMUM OUTPUT VOLTAGE ERROR AMPLIFIER MAXIMUM OUTPUT VOLTAGE ERROR AMPLIFIER BANDWIDTH 3 dB LINEAR REGULATOR FEEDBACK CURRENT LINEAR REGULATOR OUTPUT VOLTAGE2 SHUTDOWN (SD) PIN Low Threshold High Threshold Input CurrenttOFF tR, tF VPWRGD tPWRGD VCROWBAR ROERR GMERR VCMPMIN VCMPMAX BW ERR IFB VO2 SDL SDH SDIB
Figure 2 RPROG 1 A Part Active Part in Shutdown
NOTES 1 Dynamic supply current is higher due to the gate charge being delivered to the external MOSFETS. 2 The LDO is tested a V OUT 3.3 V configuration with the circuit shown in Figure 2. By selecting a different R PROG value, any output voltage above 1.20 V can be set. All limits at temperature extremes are guaranteed via correlation using standard quality control methods. Specifications are subject to change without notice.Mnemonic VID1VID4, VID0 AGND FB NC VLDO SENSE SENSE+ CT CMP PWRGD VCC DRIVE2 DRIVE1 PGND
Function Voltage Identification DAC Input Pins. These pins are internally pulled up to VREG providing a logic high if left open. The DAC output range 1.167 V. Leaving all five DAC inputs open results in placing the ADP3153 into shutdown. Analog Ground Pin. This pin must be routed separately to the terminal of COUT. Shutdown Pin. A logic high will place the ADP3153 in shutdown and disable both outputs. This pin is internally pulled down. This pin is the feedback connection for the linear controller. Connect this pin to the resistor divider network to set the output voltage of the linear regulator. No Connect. Gate Drive for the Linear Regulator N-channel MOSFET. Connects to the internal resistor divider which along with the VID code, sets the output voltage. Pin 10 is also the input for the current comparator. The input for the current comparator. A threshold between Pins 10 and 11 set by the error amplifier in conjunction with RSENSE, sets the current trip point. External Capacitor CT from Pin 12 to ground sets the off time of the device. Error Amplifier Compensation Point. The current comparator threshold increases with the Pin 13 voltage. Power Good Pin. An open drain signal to indicate that the output voltage is within ± 5% regulation band. Input Voltage Pin. Gate Drive for the Synchronous Rectifier N-channel MOSFET. The voltage at Pin 16 swings from ground to VCC. Gate Drive for the buck switch N-channel MOSFET. The voltage at Pin 17 swings from ground to VCC. Driver Power Ground. Connects to the source of the bottom N-channel MOSFET onto the terminal of CIN.PIN CONFIGURATION 20-Lead Thin Shrink Small Outline (TSSOP) (RU-20)
Input Supply Voltage (Pin +16 V Shutdown Input Voltage. +16 V Power Dissipation. Internally Limited Operating Temperature Range. to +70°C Junction Temperature. 150°C JA. 110°C/W Storage Temperature Range. to +150°C Lead Temperature Range (Soldering 10 sec). +300°C
*This is a stress rating only; operation beyond these limits can cause the device to be permanently damaged.
CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the ADP3153 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality.
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