RP122x Series
400 mA Low Noise and Low Supply Current LDO Regulator
NO.EA-403-190401
OVERVIEW
The RP122x is a LDO regulator that provides low output noise, high ripple rejection and fast response
characteristics, achieved by low supply current. This device is suitable not only for noise-sensitive
applications such as high-performance analog circuits, but also for various applications.
KEY BENEFITS
Achieves Low Noise, High PSRR and Fast Response.
Provides Saving Space by Adopting of 4-pin Small Package without Noise Bypass Capacitor.
Provides Long-Duration of Operation for Battery-powered Equipment by Low Supply Current of 9.5 µA
(Typ.), despite the low-noise LDO.
KEY SPECIFICATIONS
Input Voltage Range (Max.Rating):1.9 V to 5.5 V (6.0 V)
Output Voltage Range:
1.2 V to 4.8 V (0.1 V step)
Output Voltage Accuracy:
±0.8% (V
SET
≥ 1.8 V, Ta = 25°C)
Supply Current:
Typ. 9.5 µA
Output Noise:
Typ. 8 µVrms (I
OUT
= 250 mA)
Ripple Rejection:
Typ. 90 dB (f = 1kHz)
Typ. 85 dB (f = 10kHz)
Typ. 65 dB (f = 100kHz)
Dropout Voltage:
Typ. 0.145 V (I
OUT
= 400 mA, V
SET
= 2.8 V, RP122Z)
Typ. 0.170 V (I
OUT
= 400 mA, V
SET
= 2.8 V, RP122K)
Protection Features:
Thermal Shutdown Protection (Detection Temp. Typ.165°C)
Inrush Current Limit at Typ.250mA for appr.700μs period after startup
Ceramic Capacitor (C
IN
, C
OUT
):
1.0 µF or more (No Need of Noise Bypass Capacitor)
TYPICAL APPLICATIONS
VDD VOUT
V
IN
C
IN
V
OUT
C
OUT
PACKAGE
RP122x
CE
CE Control
GND
WLCSP-4-P8
0.64 mm x 0.64 mm,
Without a bypass capacitor for noise
APPLICATIONS
●
●
●
●
t = 0.4 mm (Max.)
DFN(PLP)1010-4
1.00 mm x 1.00 mm,
t = 0.6 mm (Max.)
Mobile Phones and Tablets, Digital Cameras, Audio Devices, and Battery-powered Equipment
RF Modules
Clock Generator: VCO, PLL, etc.
Noise-sensitive Devices: ADC, DAC
1
RP122x
NO.EA-403-190401
SELECTION GUIDE
The set output voltage and the auto-discharge function
(1)
are user-selectable.
Product Name
RP122Zxx1-TR-F
RP122Kxx1-TR
Package
WLCSP-4-P8
DFN(PLP)1010-4
Quantity per Reel
5,000 pcs
10,000 pcs
Pb Free
Yes
Yes
Halogen Free
Yes
Yes
xx: Specify the set output voltage (V
SET
) within the range of 1.2 V to 4.8 V in 0.1 V steps.
The voltage in 0.05 V step is shown as follows.
Ex. 1.85 V: RP122x1815
:
Specify whether with the auto-discharge or not.
B: without the auto-discharge function
D: with the auto-discharge function
BLOCK DIAGRAMS
VDD
Thermal
Shutdown
Vref
Noise
Reduction
Current
Limit
VOUT VDD
Thermal
Shutdown
Vref
Noise
Reduction
Current
Limit
VOUT
Enable
Control
Enable
Control
CE
GND CE
GND
RP122xxx1B Block Diagram
RP122xxx1D Block Diagram
(1)
Auto-discharge
function quickly lowers the output voltage to 0 V, when the chip enable signal is switched from the
active mode to the standby mode, by releasing the electrical charge accumulated in the external capacitor.
2
RP122x
NO.EA-403-190401
PIN DESCRIPTIONS
Top View
Bottom View
2
2
1
B
A
1
A
B
RP122Z (WLCSP-4-P8) Pin Configuration
Top View
4
3
Bottom View
3
4
1
2
2
1
RP122K (DFN(PLP)1010-4) Pin Configuration
RP122Z Pin Description
Pin No.
A1
A2
B1
B2
RP122K Pin Description
Pin. No.
1
2
3
4
Symbol
VOUT
GND
CE
VDD
Output Pin
Ground Pin
Chip Enable Pin, Active-high
Input Pin
Description
Symbol
VDD
VOUT
CE
GND
Input Pin
Output Pin
Chip Enable Pin, Active-high
Ground Pin
Description
The tab on the bottom of the package must be electrically connected to GND (substrate level) when mounted on the
board.
3
RP122x
NO.EA-403-190401
ABSOLUTE MAXIMUM RATINGS
Symbol
V
IN
V
CE
V
OUT
I
OUT
P
D
Tj
Tstg
Input Voltage
Input Voltage (CE pin)
Output Voltage
Output Current
Power Dissipation
(1)
WLCSP-4-P8, JEDEC STD.51-9
DFN(PLP) 1010-4, JEDEC STD.51-7
Junction Temperature Range
Storage Temperature Range
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 are not assured.
Item
Rating
−0.3
to 6.0
−0.3
to 6.0
−0.3
to V
IN
+ 0.3
600
520
550
−40
to 125
−55
to 125
Unit
V
V
V
mA
mW
mW
C
C
RECOMMENDED OPERATING CONDITIONS
Symbol
V
IN
Ta
Input Voltage
Operating Temperature Range
Item
Rating
1.9 to 5.5
−40
to 85
Unit
V
°C
RECOMMENDED OPERATING CONDITIONS
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 ratings by momentary electronic noise or surge. And the
semiconductor devices may receive serious damage when they continue to operate over the recommended
operating conditions.
(1)
Refer to
POWER DISSIPATION
for detailed information.
4
RP122x
NO.EA-403-190401
ELECTRICAL CHARACTERISTICS
V
IN
= V
SET
+ 1 V (V
IN
= 5.5 V when V
SET
≥ 4.5 V), I
OUT
= 1mA, C
IN
= C
OUT
= 1μF, unless otherwise specified.
The specifications surrounded by
RP122xxx1x Electrical Characteristics
Symbol
Parameter
Ta = 25°C
V
OUT
Output Voltage
−40°C
≤ Ta ≤ 85°C
I
OUT
ΔV
OUT
/
ΔI
OUT
V
DIF
I
SS
Output Current
Load
Regulation
RP122Z
RP122K
1 mA ≤ I
OUT
≤ 400 mA
V
IN
= V
SET
+ 0.5 V, V
IN
≥ 1.9 V
1 mA ≤ I
OUT
≤ 400 mA
I
OUT
= 400 mA
I
OUT
= 0 mA
V
CE
= 0 V
1.2V≤V
SET
<1.4V
Line Regulation
1.4V≤V
SET
<4.3V
4.3V≤V
SET
≤4.8V
Ripple Rejection
Short Current Limit
CE Pull-down Current
CE Input Voltage, high
CE Input Voltage, low
Output Noise
Thermal Shutdown
Temperature, detection
Thermal Shutdown
Temperature, released
Auto-discharge NMOS
On-resistance
(RP122xxx1D only)
BW
I
OUT
= 1 mA
12
8
165
110
=10Hz to 100kHz I
OUT
= 250 mA
Junction Temperature
Junction Temperature
1.0
0.4
Ripple 0.2 Vp-p,
I
OUT
= 20 mA
V
OUT
= 0 V
1.9V≤V
IN
≤5.5V
V
SET
+0.5V≤V
IN
≤5.5V
V
SET
+0.3V≤V
IN
≤5.5V
f = 1 kHz
f = 10 kHz
f = 100 kHz
90
85
65
70
0.25
0.50
mA
µA
V
V
µVrms
ºC
ºC
Ω
dB
0.02
0.10
%/V
Conditions
V
SET
≥ 1.8V
V
SET
< 1.8V
V
SET
≥ 1.8V
V
SET
< 1.8V
Min.
x0.992
−14
x0.987
Typ.
are guaranteed by design engineering at -40°C ≤ Ta ≤ 85°C.
(Ta = 25°C)
Max.
x1.008
+14
x1.012
Unit
V
mV
V
Refer to
PRODUCT-SPECIFIC
ELECTRICAL CHARACTERISTICS
400
3
13
25
mA
mV
40
Dropout Voltage
Supply Current
Refer to
PRODUCT-SPECIFIC
ELECTRICAL CHARACTERISTICS
9.5
0.01
25
0.3
µA
µA
I
STANDBY
Standby Current
ΔV
OUT
/
ΔV
IN
RR
I
SC
I
PD
V
CEH
V
CEL
en
T
TSD
T
TSR
R
LOW
V
IN
= 5.0 V, CE = 0 V,
50
All test items listed under Electrical Characteristics are done under the pulse load condition (Tj ≈ Ta = 25°C) except Ripple
Rejection and Output Noise.
5
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