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PDF ISL6625A Data sheet ( Hoja de datos )
| Número de pieza | ISL6625A | |
| Descripción | Synchronous Rectified Buck MOSFET Drivers | |
| Fabricantes | Intersil | |
| Logotipo |  |
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Synchronous Rectified Buck MOSFET Drivers
ISL6625A
The ISL6625A is a high frequency MOSFET driver designed to
drive upper and lower power N-Channel MOSFETs in a
synchronous rectified buck converter topology.
In ISL6625A, the upper and lower gates are both driven to an
externally applied voltage. This provides the capability to
optimize applications involving trade-offs between gate charge
and conduction losses.
An advanced adaptive shoot-through protection is integrated to
prevent both the upper and lower MOSFETs from conducting
simultaneously and to minimize dead time. The ISL6625A has
a 10kΩ integrated high-side gate-to-source resistor to prevent
self turn-on due to high input bus dV/dt.
This driver also has an overvoltage protection feature, which is
operational while VCC is below the POR threshold. The PHASE
node is connected to the gate of the low-side MOSFET (LGATE)
via a 30kΩ resistor, limiting the output voltage of the converter
close to the gate threshold of the low-side MOSFET. This is
dependent on the current being shunted, which provides some
protection to the load should the upper MOSFET(s) become
shorted.
Applications
• High light load efficiency voltage regulators
• Core regulators for advanced microprocessors
• High current DC/DC converters
Features
• Dual MOSFET drives for synchronous rectified bridge
• Advanced adaptive zero shoot-through protection
- PHASE detection
- LGATE detection
- Auto-Zero of rDS(ON) conduction offset effect
• Low standby bias current
• 36V internal bootstrap switcher
• Bootstrap capacitor overcharging prevention
• Integrated high-side gate-to-source resistor to prevent from
self turn-on due to high input bus dV/dt
• Pre-POR overvoltage protection for start-up and shutdown
• Power rails undervoltage protection
• Expandable bottom copper pad for enhanced heat sinking
• Dual flat no-lead (DFN) package
- Near chip-scale package footprint; improves PCB
efficiency and thinner in profile
• Pb-Free (RoHS compliant)
Related Literature
• Technical Brief TB363 “Guidelines for Handling and
Processing Moisture Sensitive Surface Mount Devices
(SMDs)”
• Technical Brief TB417 “Designing Stable Compensation
Networks for Single Phase Voltage Mode Buck Regulators”
VCC
PIN 6
PWM
+5V
30.4k
POR/
CONTROL
LOGIC
32k
SHOOT-
THROUGH
PROTECTION
FIGURE 1. BLOCK DIAGRAM
BOOT
UGATE
10k
PHASE
30k
VCC
PIN 7
PINS 6 AND 7 MUST BE
TIED TOGETHER
LGATE
GND
September 19, 2012
FN7978.0
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas Inc. 2012. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
1 page  
Typical Application Circuit
ISL6625A
+5V
VTT
SVALERT#
SVDATA
SVCLK
VR_RDY
VR_RDYS
VR_HOT#
VIN
FB COMP VCC PWM1
PSICOMP
HFCOMP
ISEN1-
ISEN1+
VSEN
RGND
EN_VTT
PWM2
ISEN2-
ISEN2+
ISL6364A
OVP
VIN
+5V
+5V
+5V
+5V
+5V
EN_PWR_OVP
RAMP_ADJ
PWM3
ISEN3-
ISEN3+
IMON
IMONS
FS_DRP
FSS_DRPS
BTS_DES_TCOMPS
PWM4
ISEN4-
ISEN4+
BT_FDVID_TCOMP
ADDR_IMAXS_TMAX
GND
NPSI_DE_IMAX
PWMS
ISENS-
+5V TMS
NTC
ISENS+
RGNDS
NTC
TM
AUTO
VSENS
HFCOMPS/DVCS
RSET COMPS FBS
+12V
BOOT
VCC
ISL6625A
PWM
UGATE
PHASE
GND
LGATE
+12V
BOOT
VCC
ISL6625A
PWM
UGATE
PHASE
GND
LGATE
VIN
VIN
+12V
BOOT
VCC
ISL6625A
PWM
UGATE
PHASE
GND
LGATE
+12V
BOOT
VCC
ISL6625A
PWM
UGATE
PHASE
GND
LGATE
+12V
BOOT
VCC
ISL6625A
PWM
UGATE
PHASE
GND
LGATE
VIN
VIN
VIN
NTC: Beta = ~ 3477
5
CPU
LOAD
GPU
LOAD
FN7978.0
September 19, 2012
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet ISL6625A.PDF ] | |
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