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  Richtek Technology Electronic Components Datasheet  

RT8058 Datasheet

High Efficiency PWM Step-Down DC/DC Converter

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RT8058 pdf
Preliminary
RT8058
1MHz, 2A, High Efficiency PWM Step-Down DC/DC Converter
General Description
The RT8058 is a current mode PWM step-down converter.
The chip is ideal for fixed frequency and low ripple
applications over full range of load conditions. Its input
voltage range is from 2.6V to 5.5V with a constant 1MHz
switching frequency that allows it to adopt tiny, low cost
www.DataSchaepeat4cUit.ocrosmand inductors with 2mm or less in height making
it ideal for single-cell Li-lon/polymer battery applications.
The low on resistance internal MOSFET can achieve high
efficiency without the need of external schottky diodes in
wide operating ranges and the output voltage is adjustable
from 0.6V to 5V that can provide up to 2A load current.
The RT8058 operates at 100% duty cycle for low dropout
operation that extends battery life in portable devices.
The RT8058 is available in a WQFN-16L 3x3 package.
Ordering Information
RT8058
Package Type
QW : WQFN-16L 3x3 (W-Type)
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
Note :
Richtek Pb-free and Green products are :
}RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
}Suitable for use in SnPb or Pb-free soldering processes.
}100% matte tin (Sn) plating.
Features
l 0.6V Reference Allows Low Output Voltage
l Low Dropout Operation : 100% Duty Cycle
l 2A Load Current
l < 2uA Shutdown Current
l Up to 95% Efficiency
l No Schottky Diode Required
l 1MHZ Constant Switching Frequency
l Low RDS(ON) Internal Switches
l Internally Compensated
l Internal Soft-Start
l Over temperature Protection
l Short Circuit Protection
l Small 16-Lead WQFN Package
l RoHS Compliant and 100% Lead (Pb)-Free
Applications
l Portable Instruments
l Microprocessors and DSP Core supplies
l Cellular Telephones
l Wireless and DSL Modems
l Digital Cameras
l PC Cards
Pin Configurations
(TOP VIEW)
16 15 14 13
PGND 1
12 PVDD
PGND
PGND
FB
2
3
4
PGND
17
11 PVDD
10 PVDD
9 VDD
5678
WQFN-16L 3x3
DS8058-02 August 2007
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT8058 Datasheet

High Efficiency PWM Step-Down DC/DC Converter

No Preview Available !

RT8058 pdf
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
www.DataShFeeut4nU.ccotmional 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


Part Number RT8058
Description High Efficiency PWM Step-Down DC/DC Converter
Maker Richtek
Total Page 15 Pages
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