RP500x SERIES
Step-down DC/DC Converters with synchronous rectifier
NO.EA-155-071030
OUTLINE
The RP500X Series are CMOS-based 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.
50mV(custom-made) 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 DFN(PLP)1820-6, SOT23-6, WLCSP-6 (0.16φ), high density mounting on boards is
possible.
FEATURES
z
Output Current....................................................... Min. 400mA
z
Input Voltage Range.............................................. 2.55V to 5.50V
z
Output Voltage....................................................... 1.1V to 3.3V
z
High Accuracy Output Voltage .............................. ±1.5% (Vout≥1.6V)
±24mV (Vout<1.6V)
z
Oscillator Frequency ............................................. Typ. 1.2MHz/3.3MHz
(We changed the product name of 3.3MHz device.)
z
Built-in Soft start Function ..................................... Typ.0.1ms
z
Built-in Latch type Protection ................................ Typ.1.5ms
z
Built-in UVLO Function.......................................... Typ. 2.2V
z
Two choices of Switching Mode ............................ Automatic PWM/PFM mode change / PWM fixed
z
Packages............................................................... DFN(PLP)1820-6, SOT23-6W, WLCSP-6 (0.16φ)
APPLICATIONS
z
Power source for portable equipment such as cellular, PDA, DSC, Notebook PC
z
Power source for HDD
z
Power source for Li-ion battery-used equipment
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RP500X
ABSOLUTE MAXIMUM RATINGS
AGND=PGND=0V
Item
Symbol
Rating
Unit
V
IN
Supply Voltage
V
IN
6.5
V
Lx Pin Voltage
V
LX
-0.3 to V
IN
+0.3
V
CE Pin Input Voltage
V
CE
-0.3 to V
IN
+0.3
V
Vout Pin Voltage
V
OUT
-0.3 to V
IN
+0.3
V
Lx Pin Output Current
I
LX
800
mA
Power Dissipation
P
D
DFN(PLP)
880
mW
SOT
430
WLCSP
T.B.D.
Operating Temp. Range
Topt
-40 to 85
°
C
Storage Temp. Range
Tstg
-55 to 125
°
C
*Absolute Maximum ratings are threshold limit values that must not be exceeded. Moreover, such values for any two
items must not be reached simultaneously. Operation above these absolute maximum ratings may cause degradation
or permanent damage to the device. These are stress ratings only and do not necessarily imply functional operation
these limits.
SELECTION GUIDE
In the RP500 series, output voltage, function options, etc. can be designated with user's request.
Part number can be designated as follows:
RP500X xx x x - xx
a
Code
a
b c d
e
←
Part Number
Contents
Designation of the package
K: DFN(PLP)1820-6
N: SOT-23-6W
Z: WL-CSP-6
(Under Development)
Designation of output voltage
Designation is possible in the range from 1.1V to 3.3V with a step of 0.1V
Designation of the function (with or without PWM/PFM Alternative function, auto
discharge function)
1:with PWM/PFM alternative, without auto discharge
2:without PWM/PFM alternative, without auto discharge
4:without PWM/PFM alternative function, with auto discharge function
Frequency
A: 1.2MHz
Designation of the taping type: (-TR is the standard.)
b
c
d
e
* 0.05V step is also available as a custom code.
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