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ISL6625A Datasheet

Synchronous Rectified Buck MOSFET Drivers

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ISL6625A
Synchronous Rectified Buck MOSFET Drivers
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
DATASHEET
FN7978
Rev 0.00
September 19, 2012
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
32k
POR/
CONTROL
LOGIC
SHOOT-
THROUGH
PROTECTION
FN7978 Rev 0.00
September 19, 2012
FIGURE 1. BLOCK DIAGRAM
BOOT
UGATE
10k
PHASE
30k
PIN 7
VCC
PINS 6 AND 7 MUST BE
TIED TOGETHER
LGATE
GND
Page 1 of 10


Renesas Electronics Components Datasheet

ISL6625A Datasheet

Synchronous Rectified Buck MOSFET Drivers

No Preview Available !

ISL6625A
Ordering Information
PART NUMBER
(Notes 1, 2, 3)
PART
MARKING
TEMP. RANGE
(°C)
PACKAGE
(Pb-Free)
PKG.
DWG. #
ISL6625ACRZ-T
5AZ
0 to +70
8 Ld 2x2 DFN
L8.2x2D
ISL6625AIRZ-T
25A
-40 to +85
8 Ld 2x2 DFN
L8.2x2D
NOTES:
1. Please refer to TB347 for details on reel specifications.
2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte
tin plate plus anneal (e3 termination finish, which is 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.
3. For Moisture Sensitivity Level (MSL), please see device information page for ISL6625A. For more information on MSL please see tech brief TB363
Pin Configuration
ISL6625A
(8 LD 2x2 DFN)
TOP VIEW
UGATE 1
BOOT 2
PWM 3
GND 4
GND
8 PHASE
7 VCC
6 VCC
5 LGATE
Functional Pin Descriptions
PIN
PIN # SYMBOL
FUNCTION
1 UGATE Upper gate drive output. Connect to gate of high-side
power N-Channel MOSFET.
2 BOOT Floating bootstrap supply pin for the upper gate drive.
Connect the bootstrap capacitor between this pin
and the PHASE pin. The bootstrap capacitor provides
the charge to turn on the upper MOSFET. See
“Internal Bootstrap Device” on page 6 for guidance in
choosing the capacitor value.
3 PWM The PWM signal is the control input for the driver. The
PWM signal can enter three distinct states during
operation, see the three-state PWM Input section for
further details. Connect this pin to the PWM output of
the controller.
4 GND Bias and reference ground. All signals are referenced
to this node. It is also the power ground return of the
driver.
5 LGATE Lower gate drive output. Connect to gate of the
low-side power N-Channel MOSFET.
6,7 VCC These two pins must tie to each other. Connect them
to 12V bias supply. Place a high quality low ESR
ceramic capacitor from this pin to GND.
8 PHASE Connect this pin to the SOURCE of the upper MOSFET
and the DRAIN of the lower MOSFET. This pin provides
a return path for the upper gate drive.
- PAD Connect this pad to the power ground plane (GND) via
thermally enhanced connection.
FN7978 Rev 0.00
September 19, 2012
Page 2 of 10


Part Number ISL6625A
Description Synchronous Rectified Buck MOSFET Drivers
Maker Renesas
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