AN30180A
VIN = 2.5V to 5.5V
1.2A Synchronous DC-DC Step Down Regulator
FEATURES
Wide output voltage range : 1.15V to 2.80V
Input voltage range : 2.5V to 5.5V
Up to 1200mA Output Current
Load transient response is fast
Output current limit control of 1.8A to prevent
Excessive current flows
High efficiency over a wide load current area by
DCM (discontinuous conductive mode) operation
at light loads, CCM (continuous conductive mode)
operation in heavy loads those two modes can be
automatically switched
Switching frequency of 2.6MHz during CCM.
100% duty operation when input voltage goes
down to output voltage.
9 pin Wafer level chip size package (WLCSP Type)
Size : 1.46
×
1.46 mm ( 0.5 mm pitch)
DESCRIPTION
AN30180A is a synchronous DC-DC Step Down
Regulator and employs the hysteretic control system.
By this system, when load current charges suddenly, it
responds at high speed and minimizes the changes of
output voltage.
Since it is possible to use capacitors with small
capacitance and it is unnecessary to add external parts
for system phase compensation, this IC realizes
downsizing of set and reducing in the number of external
parts.
APPLICATIONS
High Current Distributed Power Systems such as
power amplifier in cellular phone etc.
SIMPLIFIED APPLICATION
100
90
80
70
CNT1
V
IN
PVIN
FB
1.0
μH
CNT2
EFFICIENCY CURVE
Efficiency[%]
60
50
40
30
20
VIN=2.50V
VIN=3.70V
VIN=5.50V
4.7
μF
x 2
AVIN
VOUT
AN30180A
EN
AGND
PGND
LX
4.7
μF
10
0
1
10
100
1000
Load Current[mA]
Condition :
V
IN
=2.5V , 3.7V , 5.5V, Vout=1.15V , Cout=4.7μF , Lout=1.0μH
Notes)
This application circuit is an example. The operation
of mass production set is not guaranteed. You should
perform enough evaluation and verification on the
design of mass production set. You are fully
responsible for the incorporation of the above
application circuit and information in the design of
your equipment.
Publication date: October 2012
1
Ver. AEB
AN30180A
ABSOLUTE MAXIMUM RATINGS
Parameter
Supply voltage
Operating free-air temperature
Operating junction temperature
Storage temperature
Input Voltage Range
Output Voltage Range
ESD
Symbol
V
IN
T
opr
T
j
T
stg
FB,EN,CTL1,CTL2
LX
HBM (Human Body Model)
Rating
6.0
– 30 to + 85
– 40 to + 150
– 55 to + 150
– 0.3 to (V
IN
+ 0.3)
– 0.3 to (V
IN
+ 0.3)
2
Unit
V
°C
°C
°C
V
V
kV
Notes
*1
*3
*2
*2
*2
*1
*3
*1
*3
-
Notes) Do not apply external currents and voltages to any pin not specifically mentioned.
This product may sustain permanent damage if subjected to conditions higher than the above stated absolute maximum rating.
This rating is the maximum rating and device operating at this range is not guaranteeable as it is higher than our stated
recommended operating range. When subjected under the absolute maximum rating for a long time, the reliability of the product
may be affected.
*1:The values under the condition not exceeding the above absolute maximum ratings and the power dissipation.
*2:Except for the power dissipation, operating ambient temperature, and storage temperature, all ratings are for Ta = 25°C.
*3:V
IN
is voltage for AVIN, PVIN. AVIN = PVIN,(V
IN
+ 0.3) V must not be exceeded 6 V.
POWER DISSIPATION RATING
PACKAGE
θ
JA
PD(Ta=25°C)
0.286 W
PD(Ta=85°C)
0.148 W
Notes
*1
9pin Wafer level chip size package
436
°C
/W
(WLCSP Type)
Note). For the actual usage, please refer to the PD-Ta characteristics diagram in the package specification, follow the power supply
voltage, load and ambient temperature conditions to ensure that there is enough margin and the thermal design does not
exceed the allowable value.
*1:Glass Epoxy Substrate(4 Layers) [Glass-Epoxy: 50 X 50 X 0.8t(mm)]
Die Pad Exposed , Soldered.
CAUTION
Although this has limited built-in ESD protection circuit, but permanent damage may occur on it.
Therefore, proper ESD precautions are recommended to avoid electrostatic damage to the MOS gates
2
Ver. AEB
AN30180A
RECOMMENDED OPERATING CONDITIONS
Parameter
Supply voltage range
Symbol
V
IN
FB
EN
Input Voltage Range
CNT1
CNT2
Output Voltage Range
LX
– 0.3
– 0.3
– 0.3
—
—
—
Min.
2.5
– 0.3
– 0.3
Typ.
3.7
—
—
Max.
5.5
V
IN
+ 0.3
V
IN
+ 0.3
V
IN
+ 0.3
V
IN
+ 0.3
V
IN
+ 0.3
Unit
V
V
V
V
V
V
Notes
*1
*2
*3
*3
*3
*3
*3
Note) Do not apply external currents and voltages to any pin not specifically mentioned.
Voltage values, unless otherwise specified, are with respect to GND. GND is voltage for AGND, PGND. AGND = PGND
Vin is voltage for AVIN, PVIN. AVIN = PVIN
*1 : Please set the rising time of power input pin to the following range.
In addition, please input the voltage with the rising time which has margin enough in consideration of the variation
in external parts.
*2 : The values under the condition not exceeding the above absolute maximum ratings and the power dissipation.
*3 : (V
IN
+ 0.3) V must not be exceeded 6 V.
0V
100
μs
< Tr < 1.5 ms
(Tr is the rise time from 0 V to the setup voltage of V
IN
.)
3
Ver. AEB
AN30180A
ELECTRICAL CHARACTERISTICS
Cout = 4.7
μF
(Murata), Lout = 1.0
μH
(FDK) , VOUT Setting = 1.15 V , V
IN
= AV
IN
= PV
IN
= 3.7 V,
T
a
= 25
°C ±
2
°C
unless otherwise noted.
Limits
Parameter
Symbol
Conditions
Min
[Current Consumption] (DCDC step down regulator)
Current Consumption
OFF Current Consumption
IINQ
ISTB
IOUT = 0A,VOUT = 1.15 V,
EN = L
—
—
40
0
80
1
μA
μA
—
—
Typ
Max
Unit
Notes
[DCDC Characteristics] (DCDC step down regulator)
Output Voltage Setting 1
Output Voltage Setting 2
Output Voltage Setting 3
Output Voltage Setting 4
VOUT1
VOUT2
VOUT3
VOUT4
CNT1 = L , CNT2 = L
IOUT = 600 mA
CNT1 = H , CNT2 = L
IOUT = 600 mA
CNT1 = L , CNT2 = H
IOUT = 600 mA
CNT1 = H , CNT2 = H
IOUT = 600 mA
1.115
1.260
1.745
2.715
1.150
1.300
1.800
2.800
1.185
1.340
1.855
2.885
V
V
V
V
—
—
—
—
Line Regulation
VIN = 2.5 V to 5.5 V,
REGIN VOUT = 1.15 V
IOUT = 600m A
REGLD
RONP
RONN
FSW
IOUT = 600 mA ( CCM )
Load resistance = 12
Ω
Settling time to reach 90 % of
setting voltage from EN rising
edge
EN = L
VOUT = 1.15 V,
IOUT = 10
μA
to 1200 mA
—
0.25
0.75
%/V
—
Load Regulation
Pch-MOS ON Resistance
Nch-MOS ON Resistance
SW Frequency
—
—
—
2.0
3.3
0.2
0.2
2.6
5.8
0.4
0.4
3.2
%
Ω
Ω
MHz
—
—
—
—
Rising Time
TSTU
—
—
120
μs
Ω
—
Output discharge resistance
RDIS
—
10
20
—
4
Ver. AEB
AN30180A
ELECRTRICAL CHARACTERISTICS
(Continued)
Cout = 4.7
μF
(Murata), Lout = 1.0
μH
(FDK) , VOUT Setting = 1.15V , V
IN
= AV
IN
= PV
IN
= 3.7 V,
T
a
= 25
°C ±
2
°C
unless otherwise noted.
Limits
Parameter
Symbol
Conditions
Min
[Logic Pin Characteristics] (DCDC step down regulator)
EN Control Voltage L
EN Control Voltage H
EN Leak Current
CNT1 Control Voltage L
CNT1 Control Voltage H
CNT1 Leak Current
CNT2 Control Voltage L
CNT2 Control Voltage H
CNT2 Leak Current
VENTL
VENTH
IENL
VCNT1
L
VCNT1
H
ICNT1L VIN = VCNT1 = 5.5 V
VCNT2
L
VCNT2
H
ICNT2L VIN = VCNT2 = 5.5 V
VIN = VEN = 5.5 V
—
1.5
–1
—
VIN –
0.3
–1
—
VIN –
0.3
–1
—
—
0
—
—
0
—
—
0
0.3
—
1
0.3
—
1
0.3
—
1
V
V
μA
V
V
μA
V
V
μA
—
—
—
—
—
—
—
—
—
Typ
Max
Unit
Notes
[Under Voltage Lock out] (DCDC step down regulator)
UVLO Detection Voltage
UVLO Hysteresis Voltage
VUON
VUHY
VIN rising to Start Operation
2.3
25
2.4
75
2.5
125
V
mV
—
—
5
Ver. AEB
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