ISL6530 Dual 5V Synchronous Buck Pulse-Width Modulator (PWM) Controller for DDRAM Memory V<sub>DDQ</sub> and V<sub>TT</sub>Termination

ISL6530

Dual 5V Synchronous Buck Pulse-Width Modulator (PWM) Controller for DDRAM Memory V_DDQ and V_TTTermination

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	Technical Documentation		Tools And Support
	Pricing / Samples		Related Devices

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	ISL6530CBZ	Details
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Datasheet
	ISL6530
	Dual 5V Synchronous Buck Pulse-Width Modulator (PWM) Controller for DDRAM Memory V_DDQ and V_TT Termination

V_IN (min) (V)

V_IN (max) (V)

V_OUT (min) (V)

V_OUT (max) (V)

I_OUT (max) (A)

Switching Freq. (kHz)

300

Product Information

Key Features

Provides V_DDQ, Vsub>REF, and V_TT voltages for one- and two-channel DDRAM memory systems
Excellent voltage regulation
- V_DDQ = 2.5V ±2% over full operating range
- Vsub>REF = (V_DDQ÷2) ±1% over full operating range
- V_TT = Vsub>REF ± 30mV
Supports 'S3' sleep mode
- V_TT is held at VDDQ÷2 via low power window regulator to minimize wake-up time
Fast transient response
- Full 0% to 100% duty ratio
Operates from +5V input
Overcurrent fault monitor on VDD
- Does not require extra current sensing element
- Uses MOSFET's r_DS(ON)
Drives inexpensive N-Channel MOSFETs
Small converter size
- 300kHz fixed frequency oscillator
24 Lead, SOIC or 32 Lead, 5mm×5mm QFN

Description

The ISL6530 provides complete control and protection for dual DC-DC converters optimized for high-performance DDRAM memory applications. It is designed to drive low cost N-channel MOSFETs in synchronous-rectified buck topology to efficiently generate 2.5V V_DDQ for powering DDRAM memory, V_REF for DDRAM differential signalling, and V_TT for signal termination. The ISL6530 integrates all of the control, output adjustment, monitoring and protection functions into a single package.

The VDDQ output of the converter is maintained at 2.5V through an integrated precision voltage reference. The Vsub>REF output is precisely regulated to 1/2 the memory power supply, with a maximum tolerance of ±1% over temperature and line voltage variations. V_TT accurately tracks Vsub>REF. During V2_SD sleep mode, the V_TT output is maintained by a low power window regulator.

The ISL6530 provides simple, single feedback loop, voltagemode control with fast transient response. It includes two phase-locked 300kHz triangle-wave oscillators which are displaced 90^o to minimize interference between the two PWM regulators. The regulators feature error amplifiers with a 15MHz gain-bandwidth product and 6V/µs slew rate which enables high converter bandwidth for fast transient performance. The resulting PWM duty ratio ranges from 0% to 100%.

The ISL6530 protects against over-current conditions by inhibiting PWM operation. The ISL6530 monitors the current in the V_DDQ regulator by using the r_DS(ON) of the upper MOSFET which eliminates the need for a current sensing resistor.

Pricing / Packaging / Samples / Ordering

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	Part No.	Design-In Status	Temp.	Package	MSL	Price US $

	ISL6530CBZ	Active	Comm	24 Ld SOIC	3	2.08

	ISL6530CBZ-T	Active	Comm	24 Ld SOIC T+R	3	2.08

	ISL6530CRZ	Active	Comm	32 Ld QFN	3	2.24

	ISL6530CRZ-T	Active	Comm	32 Ld QFN T+R	3	2.24

	ISL6530EVAL1	Active		Eval Board	N/A	Contact Us

	ISL6530EVAL2	Active		Eval Board	N/A	Contact Us

	ISL6530CB	InActive	Comm	24 Ld SOIC	1	N/A

	ISL6530CB-T	InActive	Comm	24 Ld SOIC T+R	1	N/A

	ISL6530CR	InActive	Comm	32 Ld QFN	1	N/A

	ISL6530CR-T	InActive	Comm	32 Ld QFN T+R	1	N/A

The price listed is the manufacturer's suggested retail price for quantities of 1K units. However, prices in today's market are fluid and may change without notice.
MSL = Moisture Sensitivity Level - per IPC/JEDEC J-STD-020
SMD = Standard Microcircuit Drawing

Technical Documentation

Datasheet(s):
Dual 5V Synchronous Buck Pulse-Width Modulator (PWM) Controller for DDRAM Memory V_DDQ and V_TT Termination
Evaluation Board(s):
VDDQ and VTT Termination Regulation for DDR DRAM Memory Power Utilizing the ISL6530

Tools And Support
iSim Design Simulation
No Models Available

Application Block Diagrams

Applications

V_DDQ, V_TT, and Vsub>REF regulation for DDRAM memory systems
- Main Memory in AMD® Athlon™ and K8™, Pentium® III, Pentium IV, Transmeta, PowerPC™, AlphaPC™, and UltraSparc® based computer systems
- Video memory in graphics systems
High-power tracking DC-DC regulators

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