PicoBK MYRGC series
0.5A Inductor Built-in Step-down DC/DC Converter
GENERAL DESCRIPTION
The MYRGC series is a 18V operation synchronous step-down
DC/DC converter ICs with a built-in high-side / low-sidedriver transistor.
The MYRGC series has operating voltage range of 3.0V 18.0V and
it can support 0.5A as an outputcurrent with high-efficiency.
Compatible with Low ESR capacitors such as ceramic capacitors
for the load capacitor (CL).
0.75V reference voltage source is incorporated in the IC,
and the output voltage can be set to a value from 1.0V to 15.0V using external resistors (RFB1, RFB2).
1.2MHz can be selected for the switching frequency. In PWM/PFM automatic switchover control, IC can change the control method
between PWM and PFM based on the output current requirement and as a result IC can achieve high efficiency over the full load
range.
MYRGC has a fixed internal soft start time which is 1.0ms (TYP.), additionally the time can be extended by using an external
resistor and capacitor.
FEATURES
APPLICATIONS
: 3.0 18VAbsolute Max 20V
Input Voltage Range
Hot water supply system
Output Voltage Range : 1.0 15.0V (FB Voltage=0.75V1.5%)
Recorders,Camcorders
Switching Frequency
: 1.2MHz
Refrigerators,Air-conditioners
Output Current
: 0.5A
ControlMethods : PWM control (MYRGC075050P/Q)
Low Power Systems
PWM/PFM Automatic (MYRGC075050R/S)
Efficiency 85%@12V5V, 1mA
Soft-start Time
: Adjustable by RC
ProtectionCircuits
: Over Current Protection
Integral Latch Method (MYRGC075050P/R)
Automatic Recovery (MYRGC075050Q/S)
Thermal Shutdown
Environmentally Friendly
: EU RoHS Compliant, Pb Free
Halogen Free
TYPICAL PERFORMANCE
TYPICAL APPLICATION CIRCUIT
CHARACTERISTICS
MYRGC V =12V, V =5.0V
IN OUT
100
80
R
PG
PG
Lx
L1
60
EN/SS V
V L2 OUT
EN/SS
C
L
PG
C
FB R 40
FB1
V
IN V
IN
FB
C 1 C 2
IN IN
PGND AGND
R
FB2
20
MYRGC075050P/Q
MYRGC075050R/S
0
0.1 1 10 100 1000
Output Current : I [mA]
OUT
Export Control Code : X0863, Document D90DH - 00054
MYRGC series A01 Page 1 of 27
Efficiency : EFFI [%]PicoBK MYRGC series
0.5A Inductor Built-in Step-down DC/DC Converter
BLOCK DIAGRAM
MYRGC Series
L1
L2
Inductor
V
IN
Local
Reg
AGND
Each
Circuit
Gate
UVLO
CLAMP
Current
SENSE
Thermal Operation Each
Shutdown Enable
Circuit
CE
Controller
EN/SS
Log ic
Current Current
Vre f Current
Feed Limit
Soft Start Limit
Back PFM
High
Side
Buffer
PWM/PFM
Controller
FB
Lx
Logic
Low
Error
Side
PWM
Amp.
Buffer
Comparator
Ramp Wave
OSC
Generator
PGND
PG
Power-Good
Comparator
The MYRGC075050P/Q series is fixed to PWM control.
The MYRGC075050R/S series is PWM / PFM automatic switching control.
Diodes inside the circuit are an ESD protection diodes and a parasitic diodes.
MYRGC series A01 Page 2 of 27