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Details, datasheet, quote on part number:RT9237ACS
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| Part: | RT9237ACS |
| Category: | Power Management => Power Distribution/Switches => Power Switches => Switching->VRM Specified |
| Description: | Description = 2-4 Phase Synchronous Buck ;; Power in Voltage = 5V ;; Output Volt. Range = 1.1V V 1.85V ;; VCC Voltage = 5V ;; Packages = SOP-28 ;; VRM = 9.0/9.2 ;; |
| Company: | RichTek Technology |
| Datasheet: | Download RT9237ACS datasheet File size : 275 kB |
| Request For quote: | Find where to buy RT9237ACS
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Datasheet text preview:
Preliminary
RT9237A
Multi-Phase DC/DC Controller for CPU Core Power Supply
General Description
The RT9237A is a multi-phase buck DC/DC controller integrated with all control functions for high performance processor VRM. The RT9237A drives 2, 3 or 4 buck switching stages operating in interleaved phase set automatically. The multi-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. RT9237A 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 RT9237A 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
Multi-Phase Power Conversion with Automatic Phase Selection 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 100kHz) Times Channel Number
Pin Configurations
Part Number RT9237ACS (Plastic SOP-28) Pin Configurations TOP VIEW
VID4 VID3 VID2 VID1 VID0 COMP FB ADJ GND
1 2 3 4 5 6 7 8 9
VDD PGOOD 2 6 PWM4
28 27 25 24 23
ISP4 ISP1 PWM1 2 2 PWM2 2 1 ISP2 2 0 ISP3 PWM3 ISN1 1 7 ISN2 1 6 ISN3
18 15 19
VSEN 1 0 IRMP 1 1 DVD 1 2 IMAX 1 3 SS 1 4
ISN4
Applications
Power Supply for Server and Workstation Power Supply for High Current Microprocessor
Ordering Information
RT9237A Package Type S : SOP-28 Operating Temperature Range C: Commercial Standard
DS9237A-00 December 2002
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RT9237A
Absolute Maximum Ratings
Supply Voltage Input, Output or I/O Voltage Ambient Temperature Range Operating Junction Temperature Range Storage Temperature Range Power Dissipation, PD @ TA = 25°C SOP-28 Package Thermal Resistance SOP-28, JA Lead Temperature (Soldering, 10 sec.)
Preliminary
7V GND-0.3V ~ VDD+0.3V 0°C ~ 70°C 0°C ~ 125°C -65°C ~ 150°C 0.625W 60°C /W 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 IRMP Pin Voltage 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 RIRMP = 50k VOSC For each phase RIRMP = 112k 85 -1.0 70 0.95 100 1 1.3 75 1 115 --80 1.05 kHz V 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 1,2,3,4 Open -5 12 mA Symbol Test Conditions Min Typ Max Units
To be continued
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DS9237A-00 December 2002
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Preliminary
Parameter Current Sense GM Amplifier ISP 1,2,3,4 Full Scale Source Current ISP 1,2,3,4 Current for OCP Protection IMAX Voltage SS Current Over-Voltage Trip (VSEN/DACOUT) Power Good Upper Threshold (VSEN/DACOUT) Lower Threshold (VSEN/DACOUT) VSEN Rising VSEN Rising 106 86 110 92 RIMAX = 15k VSS = 1V 0.55 8 118 0.6 13 122 50 80 -90 Symbol Test Conditions Min Typ
RT9237A
Max --0.65 18 126 114 94 Units µA µA V µA % % %
Function Block Diagram
DV D IMA X IRMP
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 Curr ent Limit
PW M Logic & Driver PW M Logic & Driver PW M Logic & Driver PW M Logic & Driver
+_
PW M1
_
PW MCP INH
+ _
+ _ _ _ + _ _ _
PW M2
PW MCP INH Curr ent Balance Pr oc es s or
+ _
PW M3
V SEN A DJ Dr oop Control EA
PW MCP INH
+ _
PW M4 IS P1 IS N1 IS P2 IS N2 IS P3 IS N3 IS P4 IS N4
PW MCP
+
FB
CS1 CS2
GND
CS3 CS4
CO MP
SS
DS9237A-00 December 2002
+_
+_
SS Control
+_
_
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