PicoBK MYRGM-WMYRGM-B series
1.5A Inductor Built-in Step-Down DC/DC Converters
GreenOperationCompatible
GENERAL DESCRIPTION
The MYRGM-W/MYRGM-B series is a synchronous step-down mini DC/DC converter
which integrates an inductor and a control IC in one tiny package (2.5mm3.2mm, h=1.0mm).
An internal coil simplifies the circuit and enables minimization of noise and other operational
trouble due to the circuit wiring. A wide operating voltage range of 2.7V to 5.5V enables
Support for applications that require an internally fixed output voltage (0.8V to 3.6V).
The MYRGM-W/MYRGM-B series use synchronous rectification at an operating frequency
of 3.0MHz. The MYRGM-W/MYRGM-B series use High Speed Transient Response-COT.
PWM control (MYRGM-W) or automatic PWM/PFM switching control (MYRGM-B) can be selected.
The series have a high speed soft-start as fast as 0.3ms in typical for quick turn-on. With the built-in UVLO (Under Voltage Lock
Out) function, the internal P-channel driver transistor is forced OFF when input voltage becomes 2.0V or lower. When
CE=Low, the integrated CL discharge function which enables the electric charge at the output capacitor CL to be discharged via
the internal discharge switch located between the L and V pins. The power consumption will be less than 1.0A.
X SS
FEATURES
APPLICATIONS
Input Voltage
: 2.7V5.5V
Note Book PC
Output Voltage : 0.8V3.6V
Tablet PC
Oscillation Frequency : 3.0MHz
SSD
Output Current : 1.5A
Mobile phone
Efficiency : 92% (V =5.0V, V =3.3V/500mA)
IN OUT
Projector
High Speed Transient Response-COT
ControlMethods :
Printer 100% Duty Cycle
PWM (MYRGM-W)
PWM/PFM(MYRGM-B)
: Thermal Shut Down Current
Circuit Protection
Limit Circuit (Drop)
Short Circuit Protection (Latch)
Functions : Soft-start Circuit Built-in
UVLO
CLDischarge
Output Capacitor
: Low ESR Ceramic Capacitor
Operating Ambient Temperature
: -40+105
Environmentally Friendly
: EU RoHS Compliant, Pb Free
Halogen Free
TYPICAL PERFORMANCE
TYPICAL APPLICATIONCIRCUIT
CHARACTERISTICS
MYRGM-W/MYRGM-B
(VOUT=3.3V)
100
MYRGM-B
80
60
40
MYRGM-W
20
V =5.0V
IN
0
0.1 1 10 100 1000 10000
Output Current : I (mA)
OUT
MYRGM-W/B series A01 Page 1 of 17
Efficiency : EFFI (%)PicoBK MYRGM-WMYRGM-B series
1.5A Inductor Built-in Step-Down DC/DC Converters
BLOCK DIAGRAM
* The MYRGM-W offers a fixed PWM control, a Control Logic of PWM/PFM Selector is fixed at PWM internally.
The MYRGM-B control scheme is a fixed PWM/PFM automatic switching, a Control Logic of PWM/PFM Selector is fixed at PWM/PFM automatic
switching internally.
Diodes inside the circuit are an ESD protection diode and a parasitic diode.
MYRGM-W/B series A01 Page 2 of 17