RT8055GQW Richtek USA Inc, RT8055GQW Datasheet - Page 3

• Manufacturer Part Number: RT8055GQW
• Description: IC DCDC CONV STP-DN SYNC 10WDFN
• Manufacturer: Richtek USA Inc
• Type: Step-Down (Buck), PWM - Current Moder

Specifications of RT8055GQW

• Internal Switch(s): Yes
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 0.8 V ~ 5 V
• Current - Output: 3A
• Frequency - Switching: 300kHz ~ 2MHz
• Voltage - Input: 2.6 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 10-WFDFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Functional Pin Description
Function Block Diagram
DS8055-03 March 2011
11 (Exposed Pad)
WDFN-10L 3x3
3, 4
6, 7
10
2,
1
5
8
9
COMP
Pin No.
FB
9 (Exposed Pad)
0.8V
SOP-8
POR
VDD
2,
1
3
4
5
6
7
8
Internal -
Soft Star
EA
SD
Output
Clamp
SHDN/RT
GND
LX
PGND
PVDD
VDD
FB
COMP
0.7V
0.4V
Pin Name
SHDN/RT
OSC
Shutdown Control or Frequency Setting Input. Connect a
resistor to ground from this pin sets the switching frequency.
Force this pin to V
down.
Signal Ground. All small-signal components and compensation
components should be connected to this ground, which in turn
connects to PGND at one point. The exposed pad must be
soldered to a large PCB and connected to GND for maximum
power dissipation.
Internal Power MOSFET Switches Output. Connect this pin to
the inductor.
Power Ground. Connect this pin close to the negative terminal
of C
Power Supply Input. Decouple this pin to PGND with a
capacitor.
Signal Supply Input. Decouple this pin to GND with a capacitor.
Generally, V
Feedback Pin. This pin receives the feedback voltage from a
resistive divider connected across the output.
Error Amplifier Compensation Point. The current comparator
threshold increases with this control voltage. Connect external
compensation elements to this pin to stabilize the control loop.
Comp.
Slope
IN
and C
Control
Logic
VREF
OTP
DD
OUT
ISEN
is equal to PVDD.
Limit
.
OC
DD
or GND causes the device to be shut
Pin Function
N-MOSFET I
Driver
NISEN
LIM
PVDD
LX
PGND
GND
RT8055
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