RT8203GA Richtek USA Inc, RT8203GA Datasheet - Page 22

• 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
www.richtek.com
22
Under Voltage
Over Voltage
Power-UP
Protection
Protection
Discharge
Shutdown
Shutdown
GND
VCC
Standby
Thermal
T
Mode
ON
RUN
K-Factor (μs)
LDOx < UVLO threshold
EN = High, ON3 or ON5 enabled
Either output > 111% of nominal
level, PRO = Low
Either output < 70% of nominal level
after 22ms time-out expires and
output is enabled, PRO = Low
PRO is low and either SMPS output
is still high in either standby mode or
shutdown mode
ONx < startup threshold, EN = High. LGATEx stays low if PRO is low. LDO3, LDO5 active.
EN = Low
T
J
VOUT 5
> 150°C
4.90
2.45
Condition
Table 1. TON Setting and PWM Frequency Table
Frequency (kHz)
Table 2. Operation Mode Truth Table
VOUT5
200
400
Transitions to discharge mode after a VIN POR and after
VREF becomes valid. LDO5, LDO3, and VREF remain
active.
Normal Operation.
LGATEx is forced high. LDO3, LDO5 active. Exited by VIN
POR or by toggling EN, ON3, or ON5
If PRO is low, both UGATEx and LGATEx are forced low until
enter discharge mode terminates. LDO3, LDO5 active.
Exited by VIN POR or by toggling EN, ON3, or ON5.
During discharge mode, there are two paths to discharge the
outputs capacitor residual charge during discharge mode.
The first is output capacitor discharge to GND through an
internal 17Ω switch. The second is output capacitor
discharged by forcing the low-side MOSFET turn on/off until
PHASEx voltage decrease under 1V.
All circuitry off.
All circuitry off. Exit by VIN POR or by toggling EN, ON3, or
ON5.
K-Factor (μs)
VOUT3
3.29
1.97
Frequency (kHz)
Comment
VOUT3
300
500
DS8203-04 March 2011
K-Factor Erro r (%)
Approximate
± 10
± 10