RT8058 Ver la hoja de datos (PDF) - Richtek Technology
Número de pieza
componentes Descripción
Fabricante
RT8058 Datasheet PDF : 15 Pages
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RT8058
Preliminary
Typical Application Circuit
VIN
2.6V to 5.5V
RT8058
L1
10,11,12 PVDD
LX 13,14,15 3.3uH
7 EN
CIN
10uF
9 VDD
GND
5
FB 4
PGND
1, 2, 3,
Exposed Pad (17)
R1
100k
R2
100k
COUT1
22uF
VOUT
1.2V/2A
COUT2
22uF
Functional Pin Description
Pin No.
Pin Name
Pin Function
1, 2, 3
Exposed Pad (17)
PGND
Power Ground. Connect this pin close to the (–) terminal of CIN and COUT. The
exposed pad must be soldered to a large PCB and connected to PGND for
maximum power dissipation.
4
FB
Feedback Input Pin. Receives the feedback voltage from a resistive divider
connected across the output.
5
GND
Signal Ground. Return the feedback resistive dividers to this ground, which in turn
connects to PGND at one point.
6, 8, 16
NC
No Internal Connection.
7
EN
Enable pin. A logical high level at this pin enables the converter, while a logical low
level causes the converter to shut down.
Signal Input Supply. Decouple this pin to GND with a capacitor. Normally VDD is
9
VDD
equal to PVDD. Keep the voltage difference between VDD and PVDD less than
0.5V.
10, 11, 12
PVDD
Power Input Supply of converter power stage. Decouple this pin to PGND with a
capacitor.
13, 14, 15 LX
Internal Power MOSFET Switches Output of converter. Connect this pin to the
inductor.
Function Block Diagram
OSC
Slope
Com
ISEN
PVDD
0.6V
EA
FB
Output
Clamp
OC
Limit
Int-SS
0.3V
Control
Logic
OT
VREF POR
Temp-SEN
Driver
LX
PGND
GND
www.richtek.com
2
VDD EN
DS8058-02 August 2007
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