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OB2222M
High Precision Low Cost Power Switch
GENERAL DESCRIPTION
OB2222M is a high performance, high precision
and low cost PWM Power switch for non-isolated
buck and buck-boost application. It combines a
dedicated current mode PWM controller with a
high voltage power Bipolar in SOP8 package. Its
built-in error amplifier is optimized for good
overshoot and dynamic response for low cost and
component count. With precise inner resistor
divider, precise reference of EA constant
voltage regulation of 5.0V at universal AC input
can be guaranteed. Frequency reduction and
burst mode control is implemented for high
efficiency at light load. Good EMI performance is
achieved with On-Bright proprietary frequency
shuffling technique and soft base driver design.
Low startup current and low operating current
contribute to a reliable power on startup and low
standby power consumption with OB2222M.
Constant power operation is supported at over
load application with OB2222M, which makes it
suitable for small home appliance application
where instant large power consumption is required
such as start-up of a fan.
OB2222M offers power on soft start control and
protection coverage with auto-recovery features
including cycle-by-cycle current limiting, output
short circuit protection, FB pin open loop
protection, on-chip Over Temperature Protection
(OTP), VDD Over Voltage Protection (OVP), and
VDD Under Voltage Lockout Protection (UVLO).
The tone energy at below 20KHz is minimized in
the design so that audio noise is eliminated during
operation.
OB2222M is offered in SOP8 package.
FEATURES
Universal AC input range and 5.0V output
voltage
Constant power mode operation at over load
application
Low cost and less BOM for buck and buck-
boost applications
Current mode control
40kHz (typical) maximum switching frequency
Frequency-reduction and burst mode control
for high efficiency
Frequency shuffling for EMI improvement
Power on soft-start
Built-in Leading Edge Blanking (LEB)
Cycle-by-cycle current limiting
FB pin open loop protection
Output short-circuit protection
VDD Under Voltage Lockout with Hysteresis
VDD OVP
On-Chip OTP
APPLICATIONS
Low power AC/DC offline SMPS for
Small home appliance
Linear regulator/RCC replacement
TYPICAL APPLICATION
©On-Bright Electronics
Confidential
-1-
Preliminary Datasheet
OB_DOC_DS_2222M02

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OB2222M
High Precision Low Cost Power Switch
GENERAL INFORMATION
Pin Configuration
The pin map is shown as below for SOP8
FB 1
8C
GND 2
VDD 3
SOP
7
6
CS 4
5
C
C
C
Ordering Information
Part Number
Description
OB2222MCP
SOP8, Pb-free, Tube
OB2222MCPA
SOP8, Pb-free, T&R
Package Dissipation Rating
Package
RθJA (/W)
SOP8
90
Note: Drain Pin Connected 100mm2 PCB copper
clad.
Output Power Table
Topology
Buck/Buck-Boost
90~264Vac Input
(open frame)
300mA
Absolute Maximum Ratings
Parameter
Value
C-B Voltage
700V
VDD Voltage
-0.3 to 20V
FB Voltage
-0.3 to 20V
CS Input Voltage
-0.3 to 7V
Min/Max Operating Junction
Temperature TJ
Operating Ambient
Temperature TA
Min/Max Storage
Temperature Tstg
Lead Temperature
(Soldering, 10secs)
-40 to 150
-40 to 85
-55 to 150
260
Note: Stresses beyond those listed under “absolute
maximum ratings” may cause permanent damage to the device.
These are stress ratings only, functional operation of the
device at these or any other conditions beyond those indicated
under “recommended operating conditions” is not implied.
Exposure to absolute maximum-rated conditions for extended
periods may affect device reliability.
Recommended Operating Condition
Symbol Parameter
Range
VDD
VDD Supply Voltage 4.5 to 6V
©On-Bright Electronics
Confidential
2
Preliminary Datasheet
OB_DOC_DS_2222M02

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Marking Information
OB2222M
High Precision Low Cost Power Switch
TERMINAL ASSIGNMENTS
Pin Num Pin Name
1 FB
2
3
4
5/6/7/8
GND
VDD
CS
C
I/O Description
I
Output Voltage Feedback. This pin should connect a capacitor to
ground.
P Ground
P Power Supply
I Current sense input
O Power bipolar collector pins.
©On-Bright Electronics
Confidential
-3-
Preliminary Datasheet
OB_DOC_DS_2222M02

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OB2222M
High Precision Low Cost Power Switch
BLOCK DIAGRAM
VDD
UVLO
POR
LDO
AVDD
OVP
Base Driver
LEB
C
FB
R2
OTP
Open Loop
Logic
core
PWM
Generate
Frequency
Shuffling
OSC
OCP
SCP
PWM
Vref EA
COMP
R1
AVDD
CS
GND
©On-Bright Electronics
Confidential
-4-
Preliminary Datasheet
OB_DOC_DS_2222M02

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OB2222M
High Precision Low Cost Power Switch
ELECTRICAL CHARACTERISTICS
(TA = 25, VDD=5.5V, if not otherwise noted)
Symbol
Parameter
Test Conditions
Min Typ. Max Unit
Supply Voltage (VDD) Section
I_startup
Startup Current
VDD=UVLO(off) -1V
10 uA
I_VDD_op
Operation Current
Operation supply current
CS=0.5V
Operation supply current
FB=6V
1.5 2 mA
0.4 mA
UVLO(ON) VDD Under Voltage Lockout Enter
VDD falling, gate
disappear
3 3.7 3.9 V
UVLO(OFF) VDD Under Voltage Lockout Exit
VDD rising
10.5 11.5 12.5 V
OVP
Over voltage protection Threshold
Ramp VDD
shut down
until
gate 14
15
16 V
FB RegulationIn normal regulation, FB will be regulated to
Voltage
average of 5.15V
5.15 V
Current Sense Input Section
TLEB
LEB time
250 300 350 ns
Vth_oc
Over current detection
Threshold voltage
550 575 600 mV
Td_oc
OCP propagation delay
50 100 ns
Vth_scp
Short Current protection threshold voltage
0.6 0.7 0.8 V
Vth_flt
CS floating protection threshold voltage
0.9 1.0 1.1 V
EA Section
Vref EA reference
1.44 1.5 1.56 V
Kfb/vref
FB divider coefficient
3.43
Frequency Section
Freq_Max IC Maximum frequency
36 40 44 KHz
f/Freq
Frequency shuffling range
+/-8 %
F_shuffling Shuffling frequency
78 Hz
Dmax
Maximum Duty Cycle
7 11 15 %
F_Burst
Burst Mode Switch Frequency
20 KHz
Base Driver Section
Is_max
Base sourcing maximum current
90 mA
Is_preoff Base sourcing current after pre-off
3 mA
Protection Section
Vth_OLD FB pin open loop detection threshold voltage
0.515 V
OTP
Power switch temperature for exiting over
temperature protection
Power switch temperature for entering over
temperature protection
125
150
Power BJT Section
Vceo
Collector-emitter breakdown voltage
Ic=10mA, Ib=0
450
V
Vcbo
Ic
Collector-base breakdown voltage
Collect Peak Current
Ic=10mA
700
1.0
V
A
©On-Bright Electronics
Confidential
-5-
Preliminary Datasheet
OB_DOC_DS_2222M02