RT8205L Ver la hoja de datos (PDF) - Richtek Technology
Número de pieza
componentes Descripción
Lista de partido
RT8205L Datasheet PDF : 26 Pages
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RT8205L/M
Pin No.
18
19
20
21
22
23
24
Pin Name
NC
(RT8205L)
SECFB
(RT8205M)
LGATE1
PHAS E1
UGATE1
BOOT1
PGOOD
VOUT1
Pin Function
No Internal Connection.
Charge Pump Control Pin. The SECFB is used to monitor the optional external 14V
charge pump. Connect a resistive voltage divider from the 14V charge pump output to
GND to detect the output. If SECFB drops below the threshold voltage, LGATE1 will
provide 33kHz switching frequency for the charge pump. This will refresh the external
charge pump driven by LGATE1 without over discharging the output voltage.
Lower Gate Drive Output for SMPS1. LGATE1 swings between GND and VREG5.
Switch Node for SMPS1. PHASE1 is the internal lower supply rail for the UGATE1 high
side gate driver. PHASE1 is also the current sense input for the SMPS1.
Upper Gate Driver Output for SMPS1. UGATE1 swings between PHASE1 and BOOT1.
Boost Flying Capacitor Connection for SMPS1. Connect to an external capacitor
according to the typical application circuits.
Power Good Output for Channel 1 and Channel 2. (Logical AND)
Bypass Pin for SMPS1. Connect to the SMPS1 output to bypass efficient power for
VREG5 pin. VOUT1 is also for the SMPS1 output soft-discharge.
Function Block Diagram
TONSEL SKIPSEL
BOOT1
UGATE1
PHASE1
LGATE1
VREG5
VREG5
SMPS1
PWM Buck
Controller
FB1
ENTRIP1
EN
VOUT1
VREG5
VIN
Power-On
Sequence
Clear Fault Latch
SW5 Threshold
Thermal
Shutdown
VREG5
VREG5
SMPS2
PWM Buck
Controller
VREG5
SW3 Threshold
BOOT2
UGATE2
PHASE2
LGATE2
VOUT2
FB2
ENTRIP2
PGOOD
GND
REF
VREG3
VREG3
DS8205L/M-05 June 2011
REF
www.richtek.com
5
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