PicoBK MYRGP-WMYRGP-B series
1.0A Inductor Built-in Step-Down DC/DC Converters
GreenOperationCompatible
GENERAL DESCRIPTION
The MYRGP-W/MYRGP-B series is a synchronous step-down micro DC/DC converter
which integrates an inductor and a control IC in one tiny package (2.0mm2.5mm, 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 2.5V to 5.5V enables
support for applications that require an internally fixed output voltage (0.8V to 3.6V).
The MYRGP-W/MYRGP-B series use synchronous rectification at an operating frequency
of 3.0MHz. The MYRGP-W/MYRGP-B series use High Speed Transient Response -COT
synchronous rectification.
PWM control (MYRGP-W) or PWM/PFM switching control (MYRGP-B) automatic 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 LX and VSS pins. The power consumption will be less than 1.0A.
FEATURES
APPLICATIONS
Input Voltage : 2.5V5.5V
Note Book PC
Output Voltage : 0.8V3.6V(2.0%)
Tablet PC
Switching Frequency : 3.0MHz
SSD(Solid State Drive)
: 1.0A
Output Current
Mobile phone
Efficiency : 93% (VIN=5.0V, VOUT=3.3V/300mA)
Digital still camera
Control Methods : High Speed Transient Response -COT
Portable game machine 100% Duty Cycle
PWM (MYRGP-W)
PWM/PFM (MYRGP-B)
Circuit Protection : Thermal Shut Down Current
Limit Circuit (Drop)
Short Circuit Protection (Latch)
: Soft-start Circuit Built-in
Functions
UVLO
C Discharge
L
: Low ESR Ceramic Capacitor
Output Capacitor
Operating Ambient Temperature : -40+105
Environmentally Friendly : EU RoHS Compliant, Pb Free
Halogen Free
TYPICAL PERFORMANCE
TYPICAL APPLICATIONCIRCUIT
CHARACTERISTICS
MYRGP-W/MYRGP-B
(VOUT=3.3V)
100
7 MYRGP-B
80
1 Lx 6
V
IN
CIN
60
4.7F
AGND
2 PGND 5
CL
1.0A
10F
40
3 V CE 4
OUT
MYRGP-W
8
20
V =5.0V
IN
0
0.1 1 10 100 1000
Output Current : I (mA)
OUT
Export Control Code : X0863, Document No : D90DH00050
MYRGP-W/B series A01 Page 1 of 20
Efficiency : EFFI (%)PicoBK MYRGP-WMYRGP-B series
1.0A Inductor Built-in Step-Down DC/DC Converters
BLOCK DIAGRAM
L1
L2
Inductor
Short
VOUT
Protection
R1 CFB
High Side
VIN
Phase CurrentLim it
Compensation
R2
Error
Comparator
Amp.
AGND
S Synch
Q Logic Buffer
Lx
Drive
R
Vrefwith
SoftStart
CE ControlLogic, Minimum
UVLO VIN
On Time
PGND
CE Thermal Shutdown
Generator
VOUT
PWM/PFM
Selector
* The MYRGP-W offers a fixed PWM control, a Control Logic of PWM/PFM Selector is fixed at PWM internally.
The MYRGP-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.
MYRGP-W/B series A01 Page 2 of 20