R5220x SERIES
PWM Step-down DC/DC Converter with switch function
NO.EA-121-120113
OUTLINE
The R5220x Series are CMOS-based PWM step-down DC/DC Converters with synchronous rectifier, low
supply current and LDO mode.
DC/DC converter of the R5220x consists of an oscillator, a PWM control circuit, a reference voltage unit, an
error amplifier, a soft-start circuit, protection circuits, a protection against miss operation under low voltage
(UVLO), PWM-DC to DC converter / LDO alternative circuit, a chip enable circuit, and a driver transistor. A high
efficiency step-down DC/DC converter can be easily composed of this IC with only a few kinds of external
components, or an inductor and capacitors.
LDO of the R5220x consists of a vortage reference unit, an error amplifier, resistors for voltage setting, output
current limit circuit, a driver transistor, and so on. The output voltage is fixed internally in the R5220x. The output
voltage of the DC/DC converter and the LDO can be set independently.
PWM step-down DC/DC converter / LDO alternative circuit is active with Mode Pin of the R5220x Series. Thus,
when the load current is small, the operation can be switching into the LDO operation from PWM operation by
the logic of MODE pin and the consumption current of the IC itself will be small at light load current. 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 in PWM mode. Latch-type
protection circuit works to latch an internal driver with keeping it disable. To release the protection, after disable
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.
FEATURES
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Supply Current ................................................................ Typ. 350μA (DC/DC), Typ. 5μA (VR)
Standby Current .............................................................. Typ. 0.1μA
Built-in Driver ON Resistance ......................................... P-channel 0.5Ω, N-channel 0.5Ω (at V
IN
=3.6V)
Output Current ................................................................ Min. 400mA (DC/DC), Min. 50mA (VR)
Input Voltage ................................................................... 2.8V to 5.5V (Absolute Input Maximum: 6.5V)
Output Voltage ................................................................ 1.0V to 3.3V (0.1V steps)
Output
Oscillator Frequency (DC/DC) ........................................ Typ. 1.2MHz
Package .......................................................................... SON-6, DFN(PLP)2514-6
Built-in Soft-start Function............................................... Typ. 0.2ms
Latch-type Protection Function (Delay Time).................. Typ. 3.0ms
Built-in fold-back protection circuit (DC/DC, VR)
Ceramic Capacitor is recommended.
(For other voltages, please refer to MARK INFORMATIONS.)
Voltage Accuracy.................................................
±2.0%
(V
OUT
>
1.5),
±30mV
(V
OUT
<1.5V)
=
APPLICATIONS
•
Power source for portable equipment such as DSC, DVC, and communication equipment.
1
R5220x
BLOCK DIAGRAM
V
IN
OSC
OUTPUT
CONTROL
Vref
Current Limit
Soft
Start
L
X
MODE
∗
1
CE
V
OUT
Vref
Current Limit
GND
*1) R5220xxxxA: DC/DC mode: Mode pin= "H", VR mode: Mode pin= "L"
R5220xxxxB: DC/DC mode: Mode pin= "L", VR mode: Mode pin= "H"
SELECTION GUIDE
In the R5220x Series, the output voltage, the version and the pin polalities for the ICs can be selected at the
user's request.
Product Name
R5220Kxx∗$-TR
R5220Dxx∗$-TR-FE
package
DFN(PLP)2514-6
SON-6
Quantity per Reel
5,000 pcs
3,000 pcs
Pb Free
○
○
Halogen Free
○
○
xx： Output Voltage (V
OUT
) or serial number.
The output voltage can be designed in the range from 1.0V(10) to 3.3V(33) in 0.1V steps.
( If selected the custum-made product)The output voltage can be designed by Serial numbers.
Please refer to the attached Mark Informations.
∗
：（1）Standard
(DC/DC output voltage
=
LDO output voltage)
（2）Custom-made
(DC/DC output voltage
≠
LDO output voltage)
$
：Designation
of chip enable and Mode pin polarities
（A）Mode
pin; "H"=DC/DC converter mode, "L"=LDO Mode
（B）Mode
pin; "L"=DC/DC converter mode, "H"=LDO Mode
2
R5220x
ABSOLUTE MAXIMUM RATINGS
Symbol
V
IN
V
LX
V
CE
V
MODE
V
OUT
I
LX
I
OUT
P
D
Topt
Tstg
Item
V
IN
Supply Voltage
L
X
Pin Voltage
CE Pin Input Voltage
MODE Pin Input Voltage
V
OUT
Pin Voltage
L
X
Pin Output Current
V
OUT
Pin Output Current
Power Dissipation (SON-6)*
Power Dissipation (DFN(PLP)2514-6)*
Operating Temperature Range
Storage Temperature Range
Rating
6.5
−0.3
to V
IN
+0.3
−0.3
to 6.5
−0.3
to 6.5
−0.3
to V
IN
+0.3
600
200
500
730
−40
to 85
−55
to 125
°C
°C
Unit
V
V
V
V
V
mA
mA
mW
*) 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.
RECOMMENDED OPERATING CONDITIONS (ELECTRICAL CHARACTERISTICS)
All of electronic equipment should be designed that the mounted semiconductor devices operate within the
recommended operating conditions. The semiconductor devices cannot operate normally over the
recommended operating conditions, even if when they are used over such conditions by momentary
electronic noise or surge. And the semiconductor devices may receive serious damage when they continue
to operate over the recommended operating conditions.
4
Analogue and Mixed Signal
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