R5220x SERIES
PWM Step-down DC/DC Converter with switch function
NO.EA-121-070824
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
Output Voltage Accuracy.................................................
±2.0%
(V
OUT
>
1.5),
±30mV
(V
OUT
<1.5V)
=
Oscillator Frequency (DC/DC) ........................................ Typ. 1.2MHz
Package .......................................................................... SON-6, PLP2514-6
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.
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 taping type for the ICs can be selected at the
user's request.
The selection can be made with designating the part number as shown below;
R5220xxxxx-xx-x
←Part
Number
↑ ↑ ↑↑ ↑ ↑
a bcd e f
Code
a
b
c
Designating the Package type:
D: SON-6
K: PLP2514-6
Setting Output Voltage (V
OUT
) or alphanumeric custom code.
Setting Output Voltage
1: standard (b: output voltage; DC/DC output voltage
=
LDO output voltage)
2: custom code (b: custom code; DC/DC output voltage
≠
LDO output voltage)
Designation of chip enable and Mode pin polarities
A: CE; "H" active, Mode pin; "H"=DC/DC converter mode, "L"=LDO Mode
B: CE; "H" active, Mode pin; "L"=DC/DC converter mode, "H"=LDO Mode
Designation of Taping Type; (Refer to Taping Specification) "TR" is prescribed as a standard.
Designation of composition of plating:
−F:
Lead free plating (SON-6)
None: Au plating (PLP2514-6)
Contents
d
e
f
2
R5220x
PIN CONFIGURATIONS
SON-6
Top View
6 5 4
PLP2514-6
Top View
6
5
4
Bottom View
4 5 6
Bottom View
4
5
6
∗
∗
1 2 3
3 2 1
1
2
3
3
2
1
PIN DESCRIPTIONS
Pin No
1
2
3
4
5
6
Symbol
Lx
GND
MODE
CE
V
OUT
V
IN
Description
L
X
Pin Voltage Supply Pin
Ground Pin
Mode changer Pin
(Refer to the selection guide above.)
Chip Enable Pin (active with "H")
Output Pin
Voltage Supply Pin
* Tab in the
parts have GND level. (They are connected to the back side of this IC.)
Do not connect to other wires or land patterns.
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 (PLP2514-6)*
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 to be described.
3
Power technology
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