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PDF ISL6224 Data sheet ( Hoja de datos )
| Número de pieza | ISL6224 | |
| Descripción | Single Output Mobile-Friendly PWM Controller | |
| Fabricantes | Intersil Corporation | |
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®
Data Sheet
October 2003
ISL6224
FN9042.5
Single Output Mobile-Friendly PWM
Controller
The ISL6224 provides power control and protection for a single,
adjustable output voltage required to power chip-sets and
memory banks in high-performance notebooks and PDAs. This
output voltage is adjustable in the range from 0.9–5.5V.
The hysteretic or PWM controller regulates the output
voltage from battery voltages ranging from 4V to 24V.
Synchronous rectification and hysteretic operation at light
loads contribute to a high efficiency over a wide range of
input voltages and loads. Efficiency is even further enhanced
by using MOSFET’s RDS(ON) as a current sense
component. Feed-forward ramp modulation, average current
mode control and internal feed-back compensation provide
fast and firm handling of transients when powering advanced
chip sets.
Two-stage conversion using system 5V voltage is possible at
a higher frequency (600kHz) to minimize the output filter size.
The ISL6224 monitors the output voltage. A PGOOD (power
good) signal is issued when soft start is completed and the
output is within ±10% of the set point.
A built-in overvoltage protection prevents output voltage
from going above 120% of the set point. Undervoltage
protection latches the chip off when the output drops below
70% of its setting value after soft-start sequence is
completed. The PWM controller’s overcurrent circuitry
monitors the output current by sensing the voltage drop
across the lower MOSFET. If higher precision sense
technique is required, an optional external current-sense
resistor may be used.
Ordering Information
PART NUMBER TEMP. (oC) PACKAGE PKG. DWG. #
ISL6224CA
-10 to 85 16 Ld SSOP M16.15A
Features
• Adjustable output voltgage: 0.9–5.5V
• High efficiency over wide load range
- Higher efficiency in hysteretic mode at light load
• Lossless current sense scheme
- Uses MOSFET’s RDS(ON)
- Optional current sense method higher precision
• Supply operation mode
- Wide VIN range: 4V–24V
- Single 5V system rail
• Input undervoltage lock-out on VCC pin(UVLO)
• Excellent dynamic response
- Combined voltage feed-forward and current mode
control
• Power-Good indicator
• 300/600kHz switching frequency
• Thermal shut-down
Applications
• Mobile PCs
• Graphic cards
• Hand-held portable instruments
Related Literature
• Application Note AN9983
Pinout
ISL6224 (SSOP)
VIN 1
PGOOD
EN
OCSET
2
3
4
VOUT 5
VSEN 6
SOFT 7
GND 8
16 FCCM
15 BOOT
14 UGATE
13 PHASE
12 ISEN
11 VCC
10 LGATE
9 PGND
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2003. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL6224
Functional Pin Description
VIN (Pin 1)
Provides battery voltage to the oscillator for feed-forward
rejection of the input voltage variation. Also, this pin
programs frequency of the internal clock and gain of the
ramp generator. When connected to the battery, which
voltage varies from 4V to 24V, the clock frequency is set to
300kHz and the ramp gain is set accordingly to
accommodate the wide input voltage range.
For two step conversion from the system 5V power rail, the
Vin pin is connected to ground via 150kΩ resistor. This
arrangement changes the gain of the ramp generator to
accommodate the lower input voltage but does not change
the clock frequency.
When the Vin pin is connected to ground, the clock
frequency is set to 600kHz. The ramp generator gain is also
changed accordingly. This circuit arrangement enables the
designer to choose smaller output filter components.
PGOOD (Pin 2)
PGOOD is an open collector output used to indicate the
status of the output voltage. This pin is pulled high when the
system output is within ±10% of it’s respective nominal
voltage.
EN (Pin 3)
This pin provides the enable/disable function for the chip. The
IC is enabled when this pin is pulled over 2V or left open.
Note: a pulldown resistance of 100kΩ or less is required to
disable the controller.
OCSET (Pin 4)
A resistor from this pin to GND sets the over-current
protection threshold.
VOUT (Pin 5)
This pin is used for feedback of the output voltage to
properly position output voltage during operational mode
change.
VSEN (Pin 6)
This pin is connected to the output via a resistive divider and
provides the voltage feedback signal for the PWM controller.
The PGOOD, UVP, and OVP circuits use this signal to report
output voltage status.
SOFT (Pin 7)
This pin provides soft start of the PWM controller. When the
EN pin is pulled high, the voltage on the capacitor connected
to the soft start pin is rising linearly due to the 5µA pull-up
current. The output voltage follows the voltage on the
capacitor till it reaches the value of 0.9V. The further rise of
the voltage on the soft start capacitor does not affect the
output voltage.
GND (Pin 8)
Signal ground for the IC.
PGND (Pin 9)
This is the power ground connection for PWM converter.
This pin is connected to the lower MOSFET’s source
terminal.
LGATE (Pin 10)
This pin provides the gate drive for the lower MOSFET.
VCC (Pin 11)
This pin provides power to the chip.
ISEN (Pin 12)
This pin is used to monitor the voltage drop across the lower
MOSFET for current feedback and over-current protection.
For precise current detection this input can be connected to
an optional current sense resistor placed in series with the
source of the lower MOSFET.
PHASE (Pin 13)
Connect this pin to the PHASE node of the converter. The
PHASE node is the junction point of the upper MOSFET
source, output filter inductor, and lower MOSFET drain.
UGATE (Pin 14)
This pin provides the gate drive for the upper MOSFET.
BOOT (Pin 15)
This pin powers the upper MOSFET drivers of PWM
converter. Connect this pin to the junction of bootstrap
capacitor with the cathode of the bootstrap diode. Anode of
the bootstrap diode is connected to the VCC pin.
FCCM (Pin 16)
This pin, when pulled to VCC, restrains hysteretic operation
in light loads.
General Description
Operational Overview
The ISL6224 is a single-channel PWM controller intended
for chipset, DRAM, or other low voltage power needs of
modern notebook and sub-notebook PCs. The IC integrates
control circuits, and feedback compensation for a single
synchronous buck converter. The output voltage is set in the
range of 0.9–5.5V by an external resistive divider.
The synchronous buck converter can be configured for
either 300kHz or 600kHz switching frequencies. When
operated from battery, a switching frequency of 300kHz is
recommended. When operating from 5V, switching
frequencies of 300kHz or 600kHz are an option. For 300kHz
operation, pin 1 should be connected through a resistor
(150K) to gnd. For 600kHz operation, pin 1 should simply be
5
5 Page 
ISL6224
ISL6224 DC-DC Converter Application Circuits
Figure 5 shows an application circuit of a DC/DC converter
for a notebook PC. The power supply provides +V2_5S from
either +4V–24VDC battery voltage or system +5V bus. For
detailed information on the circuit, including a bill of
materials and circuit board description, see Application Note
AN9983. Also see Intersil’s web site (http://www.intersil.com)
for the latest information.
C2
1µF + C1
56µF
+5.6-24VIN
GND
C4
0.015µF
R2
OCSET
TBD
FCCM
EN
SOFT
PGOOD
VIN
41
16
ISL6224
3
7
2
8
GND
VCC
11
BOOT
15
CR1
14 UGATE
PHASE
13
ISEN
12
Risen
TBD
LGATE
10
9 PGND
VSEN
6
VOUT
5
+ C3
33µF
+5.0VCC
Q1
1/2 FDS6912A
C6
0.1µF
L1 6.4µH
+V2_5S
(3A)
C5
Q2 330µF
2/2 FDS6912A
+
R3
C6
R4
FIGURE 5. APPLICATION CIRCUIT FOR ONE-STEP CONVERSION (MODE 1)
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet ISL6224.PDF ] | |
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