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
capacitors and 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.
Features
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0.6V Reference Allows Low Output Voltage
Low Dropout Operation : 100% Duty Cycle
2A Load Current
< 2uA Shutdown Current
Up to 95% Efficiency
No Schottky Diode Required
1MHZ Constant Switching Frequency
Low R
DS(ON)
Internal Switches
Internally Compensated
Internal Soft-Start
Over temperature Protection
Short Circuit Protection
Small 16-Lead WQFN Package
RoHS Compliant and 100% Lead (Pb)-Free
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 :
Applications
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Portable Instruments
Microprocessors and DSP Core supplies
Cellular Telephones
Wireless and DSL Modems
Digital Cameras
PC Cards
Pin Configurations
(TOP VIEW)
NC
LX
LX
LX
16 15 14 13
}
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.
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100% matte tin (Sn) plating.
PGND
PGND
PGND
FB
1
2
3
4
5
6
7
8
12
PGND
17
11
10
9
PVDD
PVDD
PVDD
VDD
GND
NC
WQFN-16L 3x3
DS8058-02 August 2007
EN
NC
www.richtek.com
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RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
