RP503x SERIES
600mA Step-down DC/DC Converter with Synchronous Rectifier
NO.EA-235-130509
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OUTLINE
The RP503x Series are low supply current 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, UVLO circuit, a latch protection 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 18mV tolerance depending on the output voltage is guaranteed.
RP503x is PWM/VFM auto switching control in which mode automatically switches from PWM mode to
high-efficiency VFM mode in low output current. The efficiency in low output current (VFM mode) improved
compared with existing products.
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 (Non-promotion), DFN1616-6, SOT-23-5, high density mounting on
boards is possible.
∗)This
is an approximate value, because output current depends on conditions and external parts.
∗
FEATURES
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Supply Current ......................................................Typ. 20μA (at VFM mode, at no load)
Standby Current ....................................................Max. 5μA
Input Voltage Range .............................................2.5V to 5.5V (Absolute maximum rating; 6.5V)
Output Voltage Range...........................................0.8V to 2.5V (0.1V step)
Output Voltage Accuracy.......................................±1.5% (V
OUT
≥1.2V), ±18mV
(V
OUT
<1.2V)
Temperature-Drift Coefficient of Output Voltage ...Typ.
±100ppm/°C
Oscillator Frequency .............................................Typ. 2.0MHz
Oscillator Maximum Duty Cycle ............................Min. 100%
Built-in Driver ON Resistance ...............................Typ. Pch. 0.34Ω, Nch. 0.43Ω (V
IN
=3.6V)
UVLO Detector Threshold.....................................Typ. 2.2V
Soft Start Time.......................................................Typ. 0.15ms
Lx Current Limit.....................................................Typ. 800mA
Latch type Protection Circuit .................................Typ. 1.5ms
Two choices of Switching Mode............................Automatic PWM/VFM mode change
Packages ..............................................................DFN1616-6, WLCSP-6-P2 (Non-promotion), SOT-23-5
APPLICATIONS
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Power source for battery-powered equipment.
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Power source for hand-held communication equipment, cameras, VCRs, camcorders.
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Power source for HDD, portable equipment.
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RP503x
SELECTION GUIDE
The output voltage, auto discharge function, and package for the ICs can be selected at the user’s request.
Product Name
RP503Zxx∗A-E2-F
RP503Lxx∗A-TR
RP503Nxx∗A-TR-FE
Package
WLCSP-6-P2
(Non-promotion)
DFN1616-6
SOT-23-5
Quantity per Reel
5,000 pcs
5,000 pcs
3,000 pcs
Pb Free
Yes
Yes
Yes
∗
Halogen Free
Yes
Yes
Yes
xx : The output voltage can be designated in the range from 0.8V(08) to 2.5V(25) in 0.1V steps .
(For other voltages, please refer to MARK INFORMATIONS.)
∗
: The auto discharge function at off state are options as follows.
(1) without auto discharge function at off state
(2) with auto discharge function at off state
∗)
0.05V step is also available as a custom code.
The products scheduled to be discontinued (be sold to limited customer) : "Limited"
These products will be discontinued in the future. You can not select these products newly.
We will provide these products to the customer who has been using or has ordered them before.
But we recommend changing to other products as soon as possible.
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