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Part: ISL6227EVAL1
Category:
Power Management
-> PWM Controllers
Description: Dual Mobile-friendly PWM Controller With DDR Option <<<>>> <<<>>>The ISL6227 Dual PWM Controller Delivers High Efficiency Precision Voltage Regulation From Two Synchronous Buck DC/DC Converters. It Was Designed Especially to Provide Power Regulation For DDR Memory, Chipsets, Graphics And Other System Electronics in Notebook Pcs. The ISL6227 S Wide Input Voltage Range Capability Allows For Voltage Conversion Directly From Ac/dc Adaptor or Li-ion Battery Pack.
Company: Intersil Corporation
Datasheet: Download ISL6227EVAL1 datasheet File size : 288 kB
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Datasheet text preview:
®
ISL6227
D a ta Sheet M ar c h 2004 FN9094.1
Dual Mobile-Friendly PWM Controller with DDR Option
The ISL6227 dual PWM controller delivers high efficiency precision voltage regulation from two synchronous buck DC/DC converters. It was designed especially to provide power regulation for DDR memory, chipsets, graphics and other system electronics in Notebook PCs. The ISL6227's wide input voltage range capability allows for voltage conversion directly from ac/dc adaptor or Li-Ion battery pack. Automatic mode transition of constant-frequency synchronous rectification at heavy load, and hysteretic (HYS) diodeemulation at light load, assure high efficiency over a wide range of conditions. The HYS mode of operation can be disabled separately on each PWM converter if constant-frequency continuous-conduction operation is desired for all load levels. Efficiency is further enhanced by using the lower MOSFET rDS(ON) as the current sense element. Voltage-feed-forward ramp modulation, current mode control, and internal feedback compensation provide fast response to input voltage and load transients. Input current ripple is minimized by channel-to-channel PWM phase shift of 0°, 90°, or 180° (determined by input voltage and status of the DDR pin). The ISL6227 can control two independent output voltages adjustable from 0.9V to 5.5V, or by activating the DDR pin, transform into a complete DDR memory power supply solution. In DDR mode, CH2 output voltage VTT tracks CH1 output voltage VDDQ. CH2 output can both source and sink current, an essential power supply feature for DDR memory. The reference voltage VREF required by DDR memory is generated as well. In dual power supply applications the ISL6227 monitors the output voltage of both CH1 and CH2. An independent PGOOD (power good) signal is asserted for each channel after the softstart sequence has completed, and the output voltage is within PGOOD window. In DDR mode CH1 generates the only PGOOD signal. Built-in overvoltage protection prevents the output from going above 115% of the set point by holding the lower MOSFET on and the upper MOSFET off. When the output voltage re-enters regulation, PGOOD will go HIGH and normal operation automatically resumes. Once the soft-start sequence has completed, undervoltage protection latches the offending channel off if the output drops below 75% of its set point value. Adjustable overcurrent protection (OCP) monitors the voltage drop across the rDS(ON) of the lower MOSFET. If more precise current-sensing is required, an external current sense resistor may be used.
Features
· Provides regulated output voltage in the range 0.9V5.5V · Operates from an input battery voltage range of 5V to 24V or from 3.3V/5V system rail · Complete DDR1 and DDR2 memory power solution with VTT tracking VDDQ/2 and a VDDQ/2 buffered reference output · Flexible PWM or HYS plus PWM mode selection with HYS diode emulation at light loads for higher system efficiency · rDS(ON) current sensing · Excellent dynamic response with voltage feed-forward and current mode control accommodating wide range LC filter selections · Undervoltage lock-out on VCC pin · Power-good, overcurrent, overvoltage, undervoltage protection for both channels · Synchronized 300kHz PWM operation in PWM mode · Pb-Free Available as an Option
Ordering Information
PART # ISL62 27CA ISL62 27CAZ (Note) ISL62 27CA-T ISL6227CAZ-T (Note) TEMP. (°C) -10 to 100 -10 to 100 -10 to 100 -10 to 100 PACKAGE 28 Ld SSOP 28 Ld SSOP (Pb-Free) PKG. DWG. # M28.15 M28.15
28 Ld SSOP Tape and Reel M28.15 28 Ld SSOP Tape and Reel M28.15 (Pb-Free)
NOTE: Intersil Pb-Free products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which is compatible with both SnPb and Pb-free soldering operations. Intersil Pb-Free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J Std-020B.
Pinout
ISL6227 (28 LD SSOP) TOP VIEW
GND 1 LGATE1 2 PGND1 3 PHASE1 4 UGATE1 5 BOOT1 6 ISEN1 7 EN1 8 VOUT1 9 VSEN1 10 OCSET1 11 28 VCC 27 LGATE2 26 PGND2 25 PHASE2 24 UGATE2 23 BOOT2 22 ISEN2 21 EN2 20 VOUT2 19 VSEN2 18 OCSET2 17 SOFT2 16 PG2/REF 15 PG1
Applications
· Notebook PCs and Desknotes · Hand-held portable instruments 1 · Tablet PCs/Slates
SOFT1 12 DDR 13 VIN 14
ISL6227 Generic Application Circuits
OCSET1
Q1
L1
VOUT1
PWM1 Q2 VI N +5V to +24V EN1 EN2 VCC DDR +5V OCSET2 PWM2 C1
+
+1.80V
Q3
L2
VOUT2 + +1.20V
Q4
C2
ISL6227 APPLICATION CIRCUIT FOR TWO CHANNEL POWER SUPPLY
OCSET1
Q1
L1
VDDQ + +2.50V
PWM1 Q2 VIN +5V to 24V EN1 EN2 VCC DDR +5V PG2/VREF PWM2 OCSET2 C1
Q3
L2 VTT + +1.25V
Q4
C2
VREF +1.25V
ISL6227 APPLICATION CIRCUIT FOR COMPLETE DDR MEMORY POWER SUPPLY
2
ISL6227
Absolute Maximum Ratings
Bias Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +6.5V Input Voltage, VIN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . +25.0V PHASE, UGATE .. . . . . . . . . . . . . . . . . . . . . . . .GND -5V (Note 1) to 33.0V BOOT, ISEN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .GND -0.3V to +33.0V BOOT with respect to PHASE .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . + 6.5V All Other Pins. . . . . . . . . . . . . . . . . . . . . . . . . . . .GND -0.3V to VCC + 0.3V ESD Classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Class 2
Thermal Information
Thermal Resistance (Typical, Note 2)
JA (°C/W)
80 SSOP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Maximum Junction Temperature (Plastic Package). . . . . . . . . 150°C Maximum Storage Temperature Range . . . . . . . . . . . -65°C to 150°C Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . . 300°C (SSOP - Lead Tips Only)
Recommended Operating Conditions
Bias Voltage, VCC. . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . .+5.0V ± 5% Input Voltage, VIN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +5.0V to +24.0V Ambient Temperature Range . . . . . . . . . . . . . . . . . . . . . .-10°C to 100°C Junction Temperature Range . . . . . . . . . . . . . . . . . . . . . . -10°C to 125°C
CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTES: 1. 250ns transient. See Confining The Negative Phase Node Voltage Swing in Application Information Section 2. JA is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
Electrical Specifications
PARAMETER VCC SUPPLY Bias Current Shut-down Current VCC UVLO Rising VCC Threshold Falling VCC Threshold VIN Input Voltage Pin Current (Sink) Shut-down Current OSCILLATOR PWM1 Oscillator Frequency Ramp Amplitude, pk-pk Ramp Amplitude, pk-pk Ramp Offset Ramp/VIN Gain Ramp/VIN Gain REFERENCE AND SOFT-START Internal Reference Voltage Reference Voltage Accuracy Soft-Start Current During Start-up Soft-Start Complete Threshold
Recommended Operating Conditions, Unless Otherwise Noted. SYMBOL TEST CONDITIONS MIN T YP MAX UNITS
ICC ICCSN
LGATEx, UGATEx Open, VSENx forced above regulation point, VIN > 5V
-
1 .8 -
3 .0 1
mA µA
VCCU VCCD
4 .3 4
4. 45 4. 14
4 .5 4 . 34
V V
IVIN IVINS
-
-
35 1
µA µA
Fc VR1 VR2 VROFF GRB1 GRB2 VIN = 16V, by design VIN = 5V, by design By design VIN 4.2V, by design VIN 4.1V by design
255 -
300 2 0 . 6 25 1 125 250
345 -
kHz V V V m V/V m V/V
VREF
- 1. 0
0 .9 - 4. 5 1.5
+1.0 -
V % µA V
ISOFT VST By design
-
3
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