RP500x SERIES
600mA Step-down DC/DC Converter with Synchronous Rectifier
NO.EA-155-100802
∗
OUTLINE
The RP500x Series are CMOS-based 600mA step-down DC/DC Converters with synchronous rectifier.
Each of these ICs consists of an oscillator, a switching control circuit, a reference voltage unit, an error
amplifier, a soft-start circuit, protection circuits, UVLO circuit, switching transistors, and so on. A low ripple, high
efficiency step-down DC/DC converter can be easily composed of this IC with only an inductor and capacitors.
In terms of the output voltage, since the feedback resistances are built-in, the voltage is fixed internally. 0.1V
step output can be set by laser-trim and 1.5% or 24mV tolerance depending on the output voltage is guaranteed.
Mode alternative circuit works automatically for improving the efficiency. Considering fixed noise frequency,
PWM fixed control type is also available.
As protection circuits, the current limit circuit which limits peak current of Lx at each clock cycle, and the latch
type protection circuit which works if the term of the over-current condition keeps on a certain time exist. The
latch-type protection circuit works to latch an internal driver with keeping it disable. To release the condition of
the protection, after disabling this IC with a chip enable circuit, enable it again, or restart this IC with power-on or
make the supply voltage at UVLO detector threshold level or lower than UVLO.
Since packages are WLCSP-6-P2, DFN1616-6, DFN(PLP)1820-6, SOT-23-6W, high density mounting on
boards is possible.
∗)This
is an approximate value, because output current depends on conditions and external parts.
∗
FEATURES
•
Supply Current ......................................................Typ. 400μA (at PWM mode)
Typ. 100μA (at VFM mode)
•
Standby Current ....................................................Max. 5μA
•
Input Voltage Range .............................................2.55V to 5.50V
•
Output Voltage Range...........................................1.1V to 3.3V (0.1V steps)
(
For other voltages, please refer to MARK INFORMATIONS.)
•
Output Voltage Accuracy.......................................±1.5% (V
OUT
≥1.6V), ±24mV
(V
OUT
<1.6V)
•
Temperature-Drift Coefficient of Output Voltage ...Typ.
±100ppm/°C
•
Oscillator Frequency .............................................Typ. 1.2MHz
•
Oscillator Maximum Duty Cycle ............................Min. 100%
•
Built-in Driver ON Resistance ...............................Typ. Pch. 0.3Ω, Nch. 0.38Ω (V
IN
=3.6V)
•
UVLO Detector Threshold.....................................Typ. 2.2V
•
Soft Start Time.......................................................Typ. 120μs
•
Lx Current Limit.....................................................Typ. 900mA
•
Latch type Protection Circuit .................................Typ. 1.5ms
•
Two choices of Switching Mode............................Automatic PWM/VFM mode change / PWM fixed
•
Packages ..............................................................WLCSP-6-P2, DFN1616-6, DFN(PLP)1820-6, SOT-23-6W
APPLICATIONS
•
Power source for battery-powered equipment.
•
Power source for hand-held communication equipment, cameras, VCRs, camcorders.
•
Power source for HDD, portable equipment.
1
RP500x
ABSOLUTE MAXIMUM RATINGS
Symbol
V
IN
V
Lx
V
CE
V
OUT
I
Lx
Input Voltage
Lx pin Voltage
CE Pin Input Voltage
Output Voltage
Lx Pin Output Current
Power Dissipation (WLCSP-6-P2)
P
D
Power Dissipation (DFN1616-6)
Power Dissipation (SOT-23-6W)
T
opt
T
stg
Operating Temperature Range
Storage Temperature Range
∗
∗
∗
AGND=PGND=0V
Item
Rating
−0.3
to 6.5
−0.3
to V
IN
+0.3
−0.3
to 6.5
−0.3
to 6.5
800
650
640
880
430
−40
to 85
−55
to 125
Unit
V
V
V
V
mA
mW
Power Dissipation (DFN(PLP)1820-6)
∗
°C
°C
∗)
For Power Dissipation, please refer to PACKAGE INFORMATION.
ABSOLUTE MAXIMUM RATINGS
Electronic and mechanical stress momentarily exceeded absolute maximum ratings may cause the
permanent damages and may degrade the life time and safety for both device and system using the device
in the field. The functional operation at or over these absolute maximum ratings is not assured.
5
Real-time operating system RTOS
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