CS5112 Datasheet, PDF (1/13 Pages) Cherry Semiconductor Corporation – 1.4A Switching Regulator with 5V, 100mA Linear Regulator with Watchdog, RESET and ENABLE

CS5112
1.4 A Switching Regulator
with 5.0 V, 100 mA Linear
Regulator with Watchdog,
RESET and ENABLE
The CS5112 is a dual output power supply integrated circuit. It
contains a 5.0 V ± 2%, 100 mA linear regulator, a watchdog timer, a
linear output voltage monitor to provide a Power On Reset (POR) and a
1.4 A current mode PWM switching regulator.
The 5.0 V linear regulator is comprised of an error amplifier,
reference, and supervisory functions. It has low internal supply current
consumption and provides 1.2 V (typical) dropout voltage at maximum
load current.
The watchdog timer circuitry monitors an input signal (WDI) from
the microprocessor. It responds to the falling edge of this watchdog
signal. If a correct watchdog signal is not received within the externally
programmable time, a reset signal is issued.
The externally programmable active reset circuit operates correctly
for an output voltage (V_LIN) as low as 1.0 V. During power up, or if the
output voltage shifts below the regulation limit, RESET toggles low and
remains low for the duration of the delay after proper output voltage
regulation is restored. Additionally a reset pulse is issued if the correct
watchdog is not received within the programmed time. Reset pulses
continue until the correct watchdog signal is received. The reset pulse
width and frequency, as well as the Power On Reset delay, are set by one
external RC network.
The current mode PWM switching regulator is comprised of an error
amplifier with selectable feedback inputs, a current sense amplifier, an
adjustable oscillator, and a 1.4 A output power switch with
anti−saturation control. The switching regulator can be configured in a
variety of topologies.
The CS5112 is load dump capable and has protection circuitry which
includes current limit on the linear and switcher outputs, and an
overtemperature limiter.
Features
• Linear Regulator
♦ 5.0 V ± 2% @ 100 mA
• Switching Regulator
♦ 1.4 A Peak Internal Switch
♦ 120 kHz Maximum Switching Frequency
♦ 5.0 V to 26 V Operating Supply Range
• Smart Functions
♦ Watchdog
♦ RESET
♦ ENABLE
• Protection
♦ Overtemperature
♦ Current Limit
• Internally Fused Leads in a SOIC Package
• Pb−Free Packages are Available*
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
© Semiconductor Components Industries, LLC, 2005
1
October, 2005 − Rev. 7
http://onsemi.com
24
1
SOIC−24
DWF SUFFIX
CASE 751E
MARKING DIAGRAM
24
CS5112
AWLYYWWG
1
CS5112 = Device Code
A
= Assembly Location
WL = Wafer Lot
YY
= Year
WW = Work Week
G
= Pb−Free Package
PIN CONNECTIONS
1
V_IN
NC
NC
V_SW
GND
GND
GND
GND
V_FB1
V_FB2
SELECT
COMP
24
ENABLE
V_REG
V_LIN
I_BIAS
GND
GND
GND
GND
RESET
C_Delay
WDI
C_OSC
ORDERING INFORMATION
Device
Package
Shipping^†
CS5112YDWF24 SOIC−24 30 Units/Rail
CS5112YDWF24G SOIC−24 30 Units/Rail
(Pb−Free)
CS5112YDWFR24 SOIC−24 1000/Tape & Reel
CS5112YDWFR24G SOIC−24 1000/Tape & Reel
(Pb−Free)
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.
Publication Order Number:
CS5112/D