MOSFET Driver. RT9627A Datasheet

RT9627A Driver. Datasheet pdf. Equivalent

RT9627A Datasheet
Recommendation RT9627A Datasheet
Part RT9627A
Description High Voltage Synchronous Rectified Dual-Channel Buck MOSFET Driver
Feature RT9627A; ® RT9627A High Voltage Synchronous Rectified Dual-Channel Buck MOSFET Driver for Notebook Computer .
Manufacture Richtek
Datasheet
Download RT9627A Datasheet




Richtek RT9627A
®
RT9627A
High Voltage Synchronous Rectified Dual-Channel Buck
MOSFET Driver for Notebook Computer
General Description
The RT9627A is a high frequency, dual-channel driver
specifically designed to drive two power N-MOSFETs in
each channel of a synchronous-rectified Buck converter
topology. It is especially suited for mobile computing
applications that require high efficiency and excellent
thermal performance. This driver, combined with Richtek's
series of multi-phase Buck PWM controllers, provides a
complete core voltage regulator solution for advanced
microprocessors.
The drivers are capable of driving a 3nF load with fast
rising/falling time and fast propagation delay. This device
implements bootstrapping on the upper gates with only a
single external capacitor. This reduces implementation
complexity and allows the use of higher performance, cost
effective, N-MOSFETs. Adaptive shoot through protection
is integrated to prevent both MOSFETs from conducting
simultaneously.
Features
Dual-Channel Driver
Each Channel Drives Two N-MOSFETs
Adaptive Shoot-Through Protection
0.5Ω On-Resistance, 4A Sink Current Capability
Supports High Switching Frequency
Tri-State PWM Input for Power Stage Shutdown
Output Disable Function
Integrated Boost Switch
Low Bias Supply Current
VCC POR Feature Integrated
RoHS Compliant and Halogen Free
Applications
Core Voltage Supplies for Intel® / AMD® Mobile
Microprocessors
High Frequency Low Profile DC/DC Converters
High Current Low Output Voltage DC/DC Converters
High Input Voltage DC/DC Converters
Simplified Application Circuit
VCC
R1 RT9627A
VCC UGATE1
C1
BOOT1
PHASE1
Enable
EN
LGATE1
VIN
R2 C2
QUG1
CIN
QLG1
L2
C3
VCORE
COUT
R5
PWM1
PWM2
PWM1
UGATE2
PWM2 BOOT2
PHASE2
GND LGATE2
R5 C15
QUG2
VIN
L3
QLG2
C16
R8
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS9627A-02 August 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1



Richtek RT9627A
RT9627A
Ordering Information
RT9627A
Package Type
QW : WDFN-12L 3x3 (W-Type)
(Exposed Pad-Option 1)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
Richtek products are :
RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
Pin Configurations
(TOP VIEW)
UGATE1 1
BOOT1 2
PWM1 3
PWM2 4
EN 5
BOOT2 6
12 PHASE1
11 LGATE1
10 VCC
9 LGATE2
8 PHASE2
13 7 UGATE2
WDFN-12L 3x3
Marking Information
0H= : Product Code
0H=YM
DNN
YMDNN : Date Code
Functional Pin Description
Pin No.
1, 7
Pin Name
Pin Function
UGATE1, High Side Gate Drive Outputs. Connect to the Gates of high side power
UGATE2 N-MOSFETs.
2, 6
BOOT1,
BOOT2
Bootstrap Supply for High Side Gate Drives. Connect the bootstrap capacitors
between these pins and the PHASEx pins. The bootstrap capacitors provide the
charge to turn on the high side MOSFETs.
3, 4
PWM1,
PWM2
Control Inputs for Drivers. The PWM signal can enter three distinct states during
operation. Connect these pins to the PWM outputs of the controller.
5 EN
8, 12
9, 11
10
PHASE2,
PHASE1
LGATE2,
LGATE1
VCC
13 (Exposed Pad) GND
Enable Control Input. When pulling low, both UGATEx and LGATEx are driven low
and the normal operation is disabled.
Switch Nodes. Connect these pins to the Sources of the high side MOSFETs and
the Drains of the low side MOSFETs. These pins provide return paths for the high
side gate drivers.
Low Side Gate Drive Outputs. Connect to the Gates of the low side power
N-MOSFETs.
Supply Voltage Input. Connect this pin to a 5V bias supply. Place a high quality
bypass capacitor from this pin to GND.
Ground. The exposed pad must be soldered to a large PCB and connected to
GND for maximum power dissipation.
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS9627A-02 August 2014



Richtek RT9627A
Function Block Diagram
VCC
EN
PWM1
POR
VCC
R
Tri-State
Detect
R
Control
Logic
PWM2
VCC
R
Tri-State
Detect
R
Control
Logic
Shoot-Through
Protection
VCC
Shoot-Through
Protection
VCC
RT9627A
BOOT1
UGATE1
PHASE1
LGATE1
GND
BOOT2
UGATE2
PHASE2
LGATE2
Operation
POR (Power On Reset)
POR block detects the voltage at the VCC pin. When the
VCC pin voltage is higher than POR rising threshold, the
POR pin output voltage (POR output) is high. POR output
is low when VCC is not higher than POR rising threshold.
When the POR pin voltage is high, UGATEx and LGATEx
can be controlled by PWMx input voltage. If the POR pin
voltage is low, both UGATEx and LGATEx will be pulled
to low.
Tri-State Detect
When both POR output and ENx pin voltages are high,
UGATEx and LGATEx can be controlled by PWMx input.
There are three PWMx input modes which are high, low,
and shutdown state. If PWMx input is within the shutdown
window, both UGATEx and LGATEx outputs are low. When
PWMx input is higher than its rising threshold, UGATEx
is high and LGATEx is low. When PWMx input is lower
than its falling threshold, UGATEx is low and LGATEx is
high.
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS9627A-02 August 2014
Control Logic
Control logic block detects whether high side MOSFET
is turned off by monitoring (UGATEx PHASEx) voltages
below 1.1V or phase voltage below 2V. To prevent the
overlap of the gate drives during the UGATEx pull low and
the LGATEx pull high, low side MOSFET can be turned
on only after high side MOSFET is effectively turned off.
Shoot-Through Protection
Shoot-through protection block implements the dead-time
when both high side and low side MOSFETs are turned
off. With shoot-through protection block, high side and
low side MOSFETs are never turned on simultaneously.
Thus, shoot-through between high side and low side
MOSFETs is prevented.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
3







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