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PDF ISL9502 Data sheet ( Hoja de datos )
| Número de pieza | ISL9502 | |
| Descripción | Two-Phase PWM Controller | |
| Fabricantes | Intersil | |
| Logotipo |  |
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®
Data Sheet
July 17, 2006
ISL9502
FN9275.1
Two-Phase PWM Controller for Graphics
Processor Units (GPU)
Increase in GPU clock frequency is accompanied by
associated increase in the demand for power and transient-
current slew rate. At the same time, the voltage tolerance
requirement during steady-state and transient operation is
becoming more stringent of advanced GPU. The ISL9502 is
a two-phase PWM controller with embedded gate drivers,
which is tailored to meet the power and dynamic
requirements. The two-phase buck converter uses two
interleaved channels to effectively double the output voltage
ripple frequency and thereby reduce output voltage ripple
amplitude with fewer components, lower component cost,
reduced power dissipation, and smaller real estate area.
The heart of the ISL9502 is the patented R3 (Robust Ripple
Regulator®) modulator. Compared with the traditional multi-
phase buck regulator, R3 technology has the fastest transient
response. This is due to the R3 modulator commanding
variable switching frequency during a load transient.
At heavy load operation of the active mode, ISL9502
commands the two phase continuous conduction mode
(CCM) operation. While the pin SET3 is asserted at the
medium or light load, the ISL9502 smoothly disables one
phase and operates in a one-phase operation. Once in one-
phase operation, when the GPU further lowers the load
current, the ISL9502 enables diode emulation to maximize
efficiency at light load depending on the logic of SET1 and
SET2.
A 6-bit digital-to-analog converter (DAC) allows dynamic
adjustment of the output voltage from 0.500V to 1.500V with
25mV step. A 0.5% system accuracy of the core output
voltage over temperature is achieved by the ISL9502.
A unity-gain differential amplifier is provided for remote GPU
die sensing. This allows the voltage on the GPU die to be
accurately measured and regulated. Current sensing can be
realized using either lossless inductor DCR sensing or
precision resistor sensing. A single NTC thermistor network
can thermally compensates the gain and the time constant of
the DCR variations. Droop control, also referred as adaptive
voltage positioning (AVP), is implemented in ISL9502 to
reduce output decoupling capacitors and achieve more cost-
effective transient-load regulation.
Features
• Precision Two-phase Buck PWM controller
- 0.5% System Accuracy Over Temperature
- Active Voltage Positioning Capability
• Internal Gate Driver with 2A Driving Capability
• Superior Load Transient Response
• Dynamic Phase Adding/Dropping
• Voltage Selection Input
- 6-Bit VSEL Input
- 0.500V to 1.500V in 25mV Steps
- Supports VSEL Change On-The-Fly
• Multiple Current-Sensing Schemes Supported
- Lossless Inductor DCR Current Sensing
- Precision Resistive Current Sensing
• Thermal Monitor
• User Programmable Switching Frequency
• Differential Remote GPU Voltage Sensing
• Static and Dynamic Current Sharing
• Overvoltage, Undervoltage, and Overcurrent Protection
• Pb-Free Plus Anneal Available (RoHS Compliant)
Ordering Information
PART
NUMBER
PART
TEMP.
MARKING (°C)
PKG.
PACKAGE DWG. #
ISL9502CRZ ISL9502CRZ -10 to 100 48 Ld 7x7 QFN L48.7x7
(Note)
(Pb-free)
ISL9502CRZ-T ISL9502CRZ -10 to 100 48 Ld 7x7 QFN L48.7x7
(Note)
(Pb-free)
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding compounds/die attach materials and 100%
matte tin plate termination finish, which are RoHS compliant and
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-020.
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2006. All Rights Reserved. R3 Technology™ is a trademark of Intersil Americas Inc.
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL9502
Electrical Specifications VDD = 5V, TA = -10°C to 100°C, Unless Otherwise Specified. (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
Leakage Current of SET1
DAC(VSEL0-VSEL5), SET3 and
SET2 Inputs Low
IIL_SET1
IIH_SET1
VIL
SET1 input is low
SET1 input is high at 3.3V
-1
-
-
DAC(VSEL0-VSEL5), SET3 and
SET2 Inputs High
VIH
0.7
Leakage Current of DAC(VSEL0-
VSEL5), SET3 and SET2
THERMAL MONITOR
IIL Logic input is low
IIH Logic input is high at 1V
-1
-
NTC Source Current
NTC = 1.3 V
53
Over-temperature Threshold
V(NTC) falling
1.165
VRHOT# Low Output Resistance
RHOT
I = 20mA
-
TYP
0
0.45
-
-
0
0.45
60
1.18
5
MAX
-
1
0.3
UNITS
µA
µA
V
-V
- µA
1 µA
67 µA
1.2 V
9Ω
ISL9502 Gate Driver Timing Diagram
PWM
UGATE
tPDHU
tRU
tFU
1V
LGATE
tFL
1V
tPDHL
tRL
Functional Pin Description
PGOOD - Power good open-drain output. Will be pulled up
externally by a 680Ω resistor to VCCP or 1.9kΩ to 3.3V.
SET3 - Low load current indicator input. When asserted low,
indicates a reduced load-current condition, and product goes
into single phase operation.
VDD - 5V control power supply.
RBIAS - 147kΩ resistor to GND sets internal current
reference.
VRHOT# - Thermal overload output indicator with
open-drain output. Over- temperature pull-down resistance
is 10Ω.
NTC - Thermistor input to VRHOT# circuit and a 60µA
current source is connected internally to this pin.
SOFT - A capacitor from this pin to GND pin sets the
maximum slew rate of the output voltage. The SOFT pin is
the non-inverting input of the error amplifier.
OCSET - Over-current set input. A resistor from this pin to
VO sets DROOP voltage limit for OC trip. A 10µA current
source is connected internally to this pin.
VW - A resistor from this pin to COMP programs the
switching frequency (exa. 4.42kΩ ≅ 300kHz).
COMP - This pin is the output of the error amplifier.
FB - This pin is the inverting input of error amplifier.
FB2 - There is a switch between FB2 pin and the FB pin.
The switch is closed in single-phase operation and is
opened in two phase operation. The components connecting
to FB2 is to adjust the compensation in single phase
operation to achieve optimum performance if needed.
VDIFF - This pin is the output of the differential amplifier.
VSEN - Remote core voltage sense input.
RTN - Remote core voltage sense return.
5 FN9275.1
July 17, 2006
5 Page 
ISL9502
Simplified Application Circuit for DCR Current Sensing
V +5
VSEL<0:5>
VIN
R12 VDD PVCC VIN
RBIAS
VIN
NTC
R13
VRHOT#
C8
SOFT
VSELs
UGATE1
BOOT1
PHASE1
SET2
SET1
SET3
ISL9502 LGATE1
PGND2
ISEN1
C6
C7
LO
R10
RL CL
ISEN1
R8
VSUM
VO'
VR_ON
GPUGOOD
REMOTE
SENSE
R2
R3 C3
C1 R1
C2
RFSET
C9
VR_ON
VIN
PGOOD
VSEN
RTN
VDIFF
FB
COMP
UGATE2
BOOT2
PHASE2
LGATE2
PGND2
ISEN2
C5
C8
LO
R11
RL CL
ISEN2
R9
VSUM
VO'
VW
GND DFB
VSUM
OCSET
DROOP VO
VSUM
R5
R4 C4
R6 RN
NTC
CCS
NETWORK
VO'
VO
CO
FIGURE 19. ISL9502 BASED TWO-PHASE BUCK CONVERTER WITH INDUCTOR DCR CURRENT SENSING
11 FN9275.1
July 17, 2006
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet ISL9502.PDF ] | |
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