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GRM21BB31A475KA74L

更新时间： 2024-11-09 12:24:51
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27页 670K
描述
VIN = 2.9V to 5.5V 2ch,0.8A General-purpose High Efficiency Power LSI

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AN30181A  
VIN = 2.9V to 5.5V 2ch,0.8A  
General-purpose High Efficiency Power LSI  
FEATURES  
DESCRIPTION  
z
High-speed response DC-DC Step-Down Regulator  
circuit that employs hysteretic control system :  
2-ch (1.2 V, 0.8 A / 1.8 V, 0.8 A)  
LDO : 1-ch (0.9 V, 10 mA)  
Built-in external Pch MOSFET gate drive circuits  
Built-in Reset function  
Built-in Under Voltage Lockout function (UVLO)  
24pin Plastic Quad Flat Non-leaded Package  
(Size : 4 × 4 mm, 0.5 mm pitch)  
AN30181A is a power management LSI which has  
DC-DC Step Down Regulators (2-ch) that employs  
hysteretic control system.  
By this system, when load current changes 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 use parts for phase  
compensation, this IC realizes downsizing of set and  
reducing in the number of external parts.  
Output voltages are 1.2 V and 1.8 V. Each maximum  
current is 0.8 A.  
z
z
z
z
z
This LSI has a LDO circuit, external Pch-MOSFET gate  
drive circuits and a reset circuit of input power supply  
voltage.  
APPLICATIONS  
High Current Distributed Power Systems such as  
SSD (Solid State Drive), Cellular Phone, etc.  
SIMPLIFIED APPLICATION  
EFFICIENCY CURVE  
[DC-DC1]  
90  
85  
80  
75  
70  
65  
60  
3.3V  
3.3V  
10 kΩ  
EN  
PVIN1  
PCNB RESET PCNT  
DIS  
PVIN1  
55  
VIN=3.3V  
50  
VIN=5.0V  
4.7 μF  
FB1  
LX1  
45  
40  
VOUT1  
10 μF  
2.2 μH  
2.2 μH  
1
10  
100  
1000  
PVIN2  
Load Current [mA]  
PVIN2  
FB2  
VOUT2  
10 μF  
AN30181A  
4.7 μF  
Condition : VIN=3.3V , 5.0V , Vout=1.2V , Cout=10μF , Lout=2.2μH  
LX2  
AVIN  
BUF  
AVIN  
1.0 μF  
[DC-DC2]  
4.7 μF  
VREG  
AGND1 AGND2 PGND1PGND2  
100  
95  
90  
85  
80  
75  
70  
1.0 μF  
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.  
65  
VIN=3.3V  
60  
VIN=5.0V  
55  
50  
1
10  
100  
1000  
Load Current [mA]  
Condition : VIN=3.3V , 5.0V , Vout=1.8V , Cout=10μF , Lout=2.2μH  
Ver. BEB  
Publication date: October 2012  
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