RT8204BGQW Richtek USA Inc, RT8204BGQW Datasheet - Page 3

• Manufacturer Part Number: RT8204BGQW
• Description: IC SYNC BUCK W/LDO CTRLR 16WQFN
• Manufacturer: Richtek USA Inc

Specifications of RT8204BGQW

• Topology: Step-Down (Buck) Synchronous (1), Linear (LDO) (1)
• Function: Any Function
• Number Of Outputs: 2
• Voltage/current - Output 1: Controller
• Voltage/current - Output 2: Controller
• W/led Driver: No
• W/supervisor: No
• W/sequencer: No
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-WFQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Functional Pin Description
DS8204B-03 March 2011
17 (Exposed Pad)
Pin No.
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
VOUT
VDD
FB
PGOOD
LPGOOD
LFB
LDRV
LGATE
VDDP
OC
PHASE
UGATE
BOOT
LEN
EN/DEM
TON
GND
Pin Name
VOUT Sense Input. Connect to the output of PWM converter. VOUT is an
input of the PWM controller.
Analog Supply Voltage Input for the internal analog integrated circuit. Bypass
to GND with a 1μF ceramic capacitor.
VOUT Feedback Input. Connect FB to a resistor voltage divider from VOUT to
GND to adjust the output from 0.75V to 3.3V.
Power Good Signal Open-Drain Output of PWM Converter. This pin will be
pulled high when the output voltage is within the target range.
Power Good signal Open-Drain Output of LDO Regulator. This pin will be
pulled high when the output voltage is within the target range.
LDO Feedback Input. Connect LFB to a resistor voltage divider from VOUT to
GND to adjust the output greater than 0.75V.
Drive Signal for the LDO’s path MOSFET.
Low side N-MOSFET Gate-Drive Output for PWM. This pin swings between
GND and VDDP.
VDDP is the gate driver supply for the external MOSFETs. Bypass to GND
with a 1μF ceramic capacitor.
PWM Current Limit Setting and sense. Connect a resistor between OC to
PHASE for current limit setting.
Inductor Connection. This pin is not only the zero-current-sense input for the
PWM converter, but also the UGATE high side gate driver return.
High Side N-MOSFET Floating Gate-Driver Output for the PWM converter.
This pin swings between PHASE and BOOT.
Boost Capacitor Connection for PWM Converter. Connect an external
ceramic capacitor to PHASE and an external diode to VDDP.
LDO Enable Input with internal pull low resistor. LDO is enabled if LEN is
greater than the on level and disabled if LEN is less than the off level.
PWM Enable and Operation Mode Selection Input. Connect to VDD for
diode-emulation mode, connect to GND for shutdown mode and floating the
pin for CCM mode.
VIN Sense Input. Connect to VIN through a resistor. TON is an input of the
PWM controller.
Analog Ground and Power Ground. The exposed pad must be soldered to a
large PCB and connected to GND for maximum power dissipation.
Pin Function
RT8204B
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