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OCP2158
1.5MHz 700mA Synchronous Step-Down Converter with Low Quiescent Current
General Description
The OCP2158 is a 1.5MHz constant frequency, high
efficiency, slope compensated current mode PWM
step-down converter. The devices integrate a main
switch and a synchronous rectifier for high efficiency
without an external Schottky diode. The OCP2158 can
operate from a 2.0V to 6.5V input voltage and is ideal
for powering portable equipment that runs from a single
cell lithium-ion (Li+) battery. It can supply 700mA
output current and can also run at 100% duty cycle for
low dropout operation, extending battery life in portable
system.
The OCP2158 features a Power Saving Mode which
reduces quiescent current to just 30μA and significantly
improves efficiency at light load.
*The OCP2158 is offered in a low profile (1mm) 5-pin,
SOT package, and is available in an adjustable version
and fixed output voltage of 1.2V, 1.5V and 1.8V.
Applications
Cellular and Smart Phones
PDAs
MP3 Player
DSP Core Supplies
Digital Still Cameras
Portable instruments
Features
High Efficiency : Up to 96%
1.5MHz Constant Switching Frequency
700mA Output Current at VIN=3.0V
Integrated Main switch and synchronous rectifier
No Schottky Diode Required
2.0V to 6.5V Input Voltage Range
Output Voltage as low as 0.6V
100% Duty Cycle in Dropout
Low Quiescent Current : 30μA
1μA Shutdown Current
Slope Compensated Current Mode Control for
Excellent Line and Load Transient Response
Short Circuit and Thermal Fault Protection
Space Saving 5-pin Thin SOT23 package
Pin Configuration
(Top View)
Run 1
GND 2
SW 3
5 VFB
4 VIN
Pin Description
Pin Number
1
2
3
4
Pin Name
RUN
GND
SW
IN
5 FB/VOUT
Pin Function
Regulator Enable control input. Drive RUN above 1.5V to turn on the part.
Drive RUN below 0.3V to turn it off. In shutdown, all functions are disable
drawing 1μA supply current. Do not leave RUN floating.
Ground
Power Switch Output. It is the Switch node connection to inductor. This pin
connects to the drains of the internal P-CH and N-CH MOSFET switches.
Supply Input Pin. Must be closely decoupled to GND, pin2, with a 2.2μF or
greater ceramic capacitor.
VFB (OCP2158): Feedback Input Pin. Connected FB to the center point of
the external resistor divider. The feedback threshold voltage is 0.6V.
VOUT (OCP2158-1.2/1.5/1.8): Output Voltage Feedback Pin. An internal
resistive divider divides the output voltage down for comparison to the
internal reference voltage.
Page1 - 2
Rev.1.3. Feb .27, 2018
源于灿瑞 磁传天下

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OCP2158
1.5MHz 700mA Synchronous Step-Down Converter with Low Quiescent Current
Ordering Information
OCP2158XXXX
Package:
TW: TSOT23-5L
Output Voltage:
Blank: ADJ
12: 1.2V
15: 1.5V
18: 1.8V
Packing:
Temperature Grade:
Blank:Tube or Bulk D: -40~85
A:Tape & Reel
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Page2 - 2
Rev.1.3. Feb .27, 2018
源于灿瑞 磁传天下