Step-up Converter. YP6188 Datasheet

YP6188 Datasheet PDF, Equivalent


Part Number

YP6188

Description

1A Iout DC-DC Step-up Converter

Manufacture

ETC

Total Page 5 Pages
PDF Download
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YP6188 Datasheet
YP6188 1A Iout DC-DC Step-up Converter
General Description
The YP6188 is a high efficiency boost
DC-DC converter which com bines a current
mode, fixed frequency (1.22MHz or 640KHz
programmable with FSEL pin) PWM architecture
for TFT LCD displays and other portable
applications.
YP6188 operates over a wide range of input
supply voltage(2.5V<VIN<5.5V) and provides a
regulated boost voltage (from VIN up to as
high as 15V). The YP6188 also features a skip
cycle mode operation for power saving at light
loads.
The built-in soft-start circuitry (externally
programm able through the CSS pin) provides the
freedom for the control of input current ramp
rate.Overall current consum ption during the
power down mode (by pull MPD~pin to logic
low) is typically less than 0.1uA.Under-voltage
lockout(UVLO),Thermal Shutdown (TSD),
Over Current detection/protection (OVL) and
other protection featuers are also incorporated
onto the YP6188 to ensure the reliable operation
under different operating circumstances.
Features
90% efficiency
Built-in 2.4A,0.18Ω,20V power NMOS switch
640KHz/1.22MHz FSEL pin selectable fixed frequency
PWM operation
Built-in slope compensation circuitry to ensure system
stability
Adfustable output voltage from VIN up to as high as 15V
Programmable Soft-Start for optimizing control of input
current
ramp rate.
Built-in Skip Cycle mode to maintain high power efficiency at
light loads.
Built-in Thermal Shutdown (TSD) and Over-current
detection/protection(OVI)
Built-in maximum duty cycle detection/protection.
Small 8-pin MSOP Package
Applications
TFT LCD displays
Portable Applications
Handheld Devices
Pin Assignment:
Pin Description
PinNumber PinName
1 COMP
2 FB
3 MPD~
4 GND
5 LX
6 VIN
7 FSEL
Comp 1
FB 2
MPD- 3
VSS 4
MSOP-8
8 CSS
7 FSEL
6 VIN
5 LX
Pin description
Compensation pin for Error Amplifier Connect RC1 and CC1 in series
in-between COMP pin and ground (GND) Optional CC2 between COMP and
GND pins will introduce the extra pole to cancel the un wanted zero due to the
non-ideal ESR of the output capacitor.
Output Voltage Feedback Loop pin.Connect an external preeision resistor
divider (RFB1 and RFB2) tap to FB pin (reference voltage is 1.18V nominal)
Will determine the nomiinal output voltage.i.e,VOUT=1.18*(1+RFB1/RFB2).
Master power down pin (active low).When MPD~pin goes low,the YP6188
Will enter the power down mode.
Ground pin
Boost converter power switch pin.Connect the inductor (L1) and catch
(Schottky)diode (D1) to LX pin with minimum trace area.
Supply voltage input pin (2.5V to 5.5V recommen ded).
Frequency selection pin When this pin is low,640KHz PWM frequency is

YP6188 Datasheet
YP6188 1A Iout DC-DC Step-up Converter
Selected. When this pin is high,the PWM frequency is 1.22MHz.This pin is
Default low (640KHz) with internal 5uA pull down device.
8 CSS Soft-Start current ramp rate control pin. Connect a soft start capscitor (Css)
In-between this pin and ground (GND) to set the proper input current ramp rate.
Typical Application Circuit:
10~47uH
1N5819
Vin LX
H: 1.22MHz FSEL
L: 640KHz
Comp
MPD-
H: Normal
L: Power Down
Cin CSS
10~100uF
Css
102
Vss
FB
RFB1
VFB=1.18V
RFB2
out
100uF
C4
C3 103
Functional Block Diagram.
VSS
Recommended Operating Conditions
VIN Supply Voltage Range
2.5V to 5.5V


Features Datasheet pdf YP6188 1A Iout DC-DC Step-up Converter General Description The YP6188 is a hig h efficiency boost DC-DC converter whic h com bines a current mode, fixed frequ ency (1.22MHz or 640KHz programmable wi th FSEL pin) PWM architecture for TFT L CD displays and other portable applicat ions. YP6188 operates over a wide range of input supply voltage(2.5V
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