RT8203GA Richtek USA Inc, RT8203GA Datasheet - Page 4

• Manufacturer Part Number: RT8203GA
• Description: IC CTRLR SMPS STPDN DUAL 28SSOP
• Manufacturer: Richtek USA Inc

Specifications of RT8203GA

• Output Isolation: Isolated
• Frequency Range: Adjustable, Selectable
• Voltage - Input: 7 V ~ 24 V
• Voltage - Output: Selectable
• Power (watts): 1.05W
• Operating Temperature: -10°C ~ 85°C
• Package / Case: 28-SSOP (0.150", 3.90mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

RT8203
Functional Pin Description
www.richtek.com
4
Pin No.
10
11
12
13
14
1
2
3
4
5
6
7
8
9
NC
PGOOD
ON3
ON5
ILIM3
EN
FB3
VREF
FB5
PRO
ILIM5
SKIP
TON
BOOT5
Pin Name
Connect to GND.
Power Good Open Drain Output. PGOOD is pulled low if either output is disable or is
more than 8.75% below its normal value.
VOUT3 Enable Input. The 3.3V SMPS is enable if ON3 is greater than the on level
and disable if ON3 is less than the off level. If ON3 is connected to V
SMPS starts after the 5V SMPS reached regulation(delay start). Force ON3 below the
clear fault level to reset the fault latched.
VOUT5 Enable Input. The 5V SMPS is enable if ON5 is greater than the on level and
disable if ON5 is less than the off level. If ON5 is connected to VREF, the 5V SMPS
starts after the 3.3V SMPS reached regulation(delay start). Force ON5 below the clear
fault level to reset the fault latched.
VOUT3 Current Limit Adjustment. The GND-PHASE3 current limit threshold defaults
to 100mV if ILIM3 is tied to VCC. In adjustable mode, the current limit threshold is 1/10
the voltage seen at ILIM3 over 0.5V to 3V range. The logic threshold for switch over to
100mV default value is approximately VCC − 1V.
Enable Control Input. The device enters its 15μA supply current shutdown mode if EN
is less than the EN input falling edge trip level and does not restart until EN is greater
than the EN input rising edge trip level. Connect EN to VIN for automatically startup.
EN can be connected to VIN through a resistive voltage divider to implement a
programmable undervoltage lockout.
VOUT3 Feedback Input. Connect FB3 to GND for fixed 3.3V operation. Connect FB3
to a resistive voltage divider from VOUT3 to GND to adjust the output from 2V to 5.5V.
2V Reference Output. Bypass to GND with a 0.22μF
up to 100μA for external loads. Loading VREF degrades FBx and VOUTx accuracy
according to the VREF load regulation error.
VOUT5 Feedback Input. Connect FB5 to GND for fixed 5V operation. Connect FB5 to
a resistive voltage divider from VOUT5 to GND to adjust the output from 2V to 5.5V.
Over Voltage and Under Voltage Fault Protection Enable/Disable. Connect PRO to
VCC to disable Over Voltage and Under Voltage protection. Connect PRO to GND to
enable Over Voltage and Under Voltage protection.
VOUT5 Current Limit Adjustment. The GND − PHASE5 current limit threshold defaults
to 100mV if ILIM5 is tied to VCC. In adjustable mode, the current limit threshold is 1/10
the voltage seen at ILIM5 over 0.5V to 3V range. The logic threshold for switch over to
100mV default value is approximately VCC − 1V.
Operation Mode Input Control. Connect SKIP to GND for diode-emulation mode
(DEM) or to VCC for CCM mode(fixed frequency). Connect to VREF or floating for
ultrasonic mode.
Frequency Select Input. Connect to VCC for 200kHz/300kHz operation and to GND
for 400kHz/500kHz operation (VOUT5/VOUT3 switching frequency respectively).
Boost Capacitor Connection for 5V SMPS. Connect an external ceramic capacitor to
PHASE5 and an external diode to LDO5.
Pin Function
(MIN)
capacitor. VREF can source
DS8203-04 March 2011
To be continued
REF
, the 3.3V