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Details, datasheet, quote on part number:RT9241A
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| Part: | RT9241A |
| Category: | Power Management => Power Distribution/Switches => Power Switches => Switching->VRM Specified |
| Description: | Description = 200kHz, 2 Phase Synchronous Buck ;; Power in Voltage = 5V ;; Output Volt. Range = 1.1V V 1.85V ;; VCC Voltage = 5V ;; Packages = SOP-14 ;; VRM = 9.0/9.2 ;; |
| Company: | RichTek Technology |
| Datasheet: | Download RT9241A datasheet File size : 342 kB |
| Request For quote: | Find where to buy RT9241A
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Datasheet text preview:
RT9241A/B
Two-Phase DC/DC Controller for CPU Core Power Supply
General Description
The RT9241A/B is a two-phase buck DC/DC controller integrated with all control functions for high performance processor VRM. The RT9241A/B drives 2 buck switching stages operating in 180 degree phase shift. The two-phase architecture provides high output current while maintaining low power dissipation on power devices and low stress on input and output capacitors. The high equivalent operating frequency also reduces the component dimension and the output voltage ripple in load transient. RT9241A/B regulates both easily set voltage and current loops. Precise current sharing for power stage is achieved by differential input current sense and processing circuit. The settings of current sense, droop tuning and over current protection are independent to compensation circuit of voltage loop. The feature greatly facilitates the flexibility of CPU power supply design and tuning. The RT9241A/B uses a 5-bit DAC of 1.1V to 1.85V (25mV/step) output with load current droop compensation to meet the strict VRM transient requirement. The IC monitors the VCORE voltage for PGOOD and over voltage protection. Soft start, over current protection and programmable under voltage lockout are also provided to assure the safety of microprocessor and power system.
Features
Two-Phase Power Conversion VRM 9.0 DAC Output with Active Droop Compensation for Fast Load Transient Precise Channel Current Sharing with Differential Sense Input Hiccup Mode Over Current Protection Programmable Under Voltage Lockout and Soft Start High Ripple Frequency, (Channel Frequency Times Channel Number) 100KHz Version (RT9241B) for Lower Switching Loss
Applications
Power Supply for Server and Workstation Power Supply for High Current Microprocessor
Pin Configurations
Part Number RT9241A/B CS (Plastic SOP-20)
VID4 VID3 VID2 VID1 VID0 C OMP FB A DJ D VD SS
1 2 3 4 5 6 7 8 9 10
Pin Configurations TOP VIEW
20 19 18 17 16 15 14 13 12 11
VD D PGO OD ISP1 PWM1 PWM2 ISP2 V S EN GN D ISN1 ISN2
Ordering Information
RT9241A/B Package type S : SOP-20 Operating temperature range C: Commercial standard Operating frequency version A : 200KHz B : 100KHz
DS9241AB-01
October 2002
www.richtek.com
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RT9241A/B
Absolute Maximum Ratings
Supply Voltage Input, Output or I/O Voltage Power Dissipation, PD @ TA = 25°C SOP-20 Package Thermal Resistance SOP-20, JA Ambient Temperature Range Junction Temperature Range Storage Temperature Range Lead Temperature (Soldering, 10 sec.) 7V GND-0.3V ~ VDD+0.3V 0.625W 110°C /W 0°C ~ 70°C 0°C ~ 125°C -40°C ~ 150°C 260°C
Electrical Characteristics
(VDD = 5V, GND = 0V, TA = 25°C, unless otherwise specified) Parameter VDD Supply Current Nominal Supply Current Power-On Reset VDD Rising Threshold VDD Falling Threshold Hysteresis VDVD Rising Trip Threshold Oscillator Frequency Ramp Amplitude Ramp Valley Maximum On Time of Each Channel Reference and DAC DACOUT Voltage Accuracy DAC (VID0-VID4) Input Low Voltage DAC (VID0-VID4) Input High Voltage DAC (VID0-VID4) Bias Current PWM Controller Error Amplifier DC Gain Bandwidth Slew Rate CL = 10pF ---85 10 5 ---dB MHz V/µS -1.0 -2.0 20 ---28 +1.0 0.8 -36 % V V µA RT9241A RT9241B For each phase 170 85 -1.0 70 200 100 1.7 1.3 75 230 115 --80 kHz V V % 4.2 -0.2 1.19 4.35 3.85 0.6 1.25 4.6 --1.31 V V V V IDD PWM 1,2 Open -4 10 mA Symbol Test Conditions Min Typ Max Units
To be continued
www.richtek.com DS9241AB-01 October 2002
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RT9241A/B
Parameter Current Sense GM Amplifier ISP 1,2 Full Scale Source Current ISP 1,2 Current for OCP Protection SS Current Over-Voltage Trip (VSEN/DACOUT) Power Good Upper Threshold (VSEN/DACOUT) Lower Threshold (VSEN/DACOUT) VSEN Rising VSEN Rising 106 86 110 90 114 94 % % VSS = 1V 8 118 13 122 18 126 µA % 50 70 -75 --µA µA Symbol Test Conditions Min Typ Max Units
Function Block Diagram
DV D
V DD PG OO D V ID0 V ID1 V ID2 V ID3 V ID4
Pow er On Reset
Os c illator
120% VDAC DA C 108% V DA C 92% VDAC
INH
+ _ _ + _ + + +
INH OV P, PGOOD POR Logic Cur rent Limit Curr ent Balance Pr oc es s or
_
PW M Logic & Driver PW M Logic & Driver
PW M1
PW MCP INH
+ + + _
V SEN A DJ Dr oop Control EA SS Control
CS1
+
CS2
FB GND
_
CO MP
SS
DS9241AB-01
October 2002
+
_ _ _
_
+ +
PW M2
PW MCP IS P1 IS N1 IS P2 IS N2
www.richtek.com
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