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Description
The YB1231 is a series of ultra-low-noise,
low dropout (LDO) linear regulators with
2.0% output voltage accuracy. The YB1231
regulators achieve a low 440mV dropout at
600mA load current of 4.5V output and are
available in voltages ranging from 3.2V to
4.5V with 0.1 V per step (custom voltage is
considerable at request).
The YB1231 regulators are optimized to
work with low-ESR and low cost ceramic
capacitors, reducing the amount of board
space critical in hand-held devices. The
YB1231 – HV600mA
Low-Noise LDO Regulator
Features
2.0% Accuracy Output Voltage
Output Voltage range 3.2V~4.5V
Low-Noise Low-Drop-Out
Stable with 2.2μF Ceramic Capacitor for
Any Load
Typical Output Current : 600 mA
Low Quiescent Current : ~100μA
440mV Dropout at 600mA Load (4.5V)
Only Need Input and Output Capacitors
Power Saving Shutdown Mode (<1μA)
Thermal Protection Shutdown
Built-In Internal Soft-Start
Output Short-circuit Current Limit
Protection
Green package (RoHS) available
YB1231 requires only 2.2 μF output
capacitor for stability with any load and
consumes less than 1μA in shutdown
mode.
Built-in thermal shutdown and short-circuit
protect offer secure protection against fault
operation. The YB1231 regulators are
available in SOT-23 / SOT-25 / SOT-89
packages.
Typical Application Circuitry
Applications
PDA, Palmtops and Notebook
Computers
DSC, Handset Camera Modules
PCMCIA Cards, PC Cameras
USB Based Portable Devices (MP3, PMP)
GSM/GPRS/3G RF Transceiver Modules
Wireless LANs
Bluetooth Portable Radios
YB1231 MRev. 1.4 www.yobon.com.tw 1
Pin Configuration
Pin Description
Tab le 1
Pin Name Pin Function
VIN Unregulated Input Supply. Bypass with a capacitor to GND.
GND Ground pin.
EN Pull high to enable the regulator.
VOUT Regulated Output Voltage. Bypass with a capacitor to GND.
YB1231 – HV600mA
Low-Noise LDO Regulator
Ordering Information
Marking Information
YB1231 MRev. 1.4 www.yobon.com.tw 2
YB1231 – HV600mA
Low-Noise LDO Regulator
Absolute Maximum Ratings
Supply Voltage........................................ -0.3V to 7.0V
Output Voltage ...............................-0.3V to (V
Output Short-Circuit Duration ........................... Infinite
Junction Temperature Range........................... +150℃
Storage Temperature Range ............. -65℃ to +150℃
Lead Temperature............................................ +250℃
+0.3V)
IN
Electrical Characteristics
Table 2
TA = 25℃, V
Function Parameter Conditions Min Typ Max Units
IN
= ( V
OUT
+ 1 V ), C
IN
= C
OU T
= 2.2μF, V
Input Voltage Range 3.5 6.0 V
Output Voltage Predefined 3.2 4.5 V
Output Voltage Accuracy I
Output Current Limit Short-circuit output 420 mA
= 10mA -2.0 +2.0 %
OUT
Recommended Operating Conditions
Input Supply Voltage................................ 2V to 6.0V
Operating Temperature..................... -40℃ to +85℃
Thermal Resistance (SOT-23/25, θ
Thermal Resistance (SOT-23/25, θ
Thermal Resistance (SOT-89, θ
Thermal Resistance (SOT-89, θ
Thermal Power Dissipation (SOT-23/25, P
Thermal Power Dissipation (SOT-89, P
= VIN
EN
) ........140℃/W
JC
)......... 280℃/W
JA
) ............... 46℃/W
JC
).............. 180℃/W
JA
)....0.4W
D
).......0.55W
D
Dropout Voltage (Note 1)
Ground Current Iground = Iin - Iout 100 160
Line Regulation Vin = (Vout + 1V) to 6V, Iout = 10 mA 0.4 %/V
Load Regulation Iout = 1mA to 600 mA 1.7 %
Shutdown Supply Current EN = 0.4V 0.01
Ripple Rejection (PSRR)
Shutdown Exit Delay (Note 2) Vout = 3.3V, Rload = 11 ohm 36 100
EN Logic Low Level Vin = 2.0V to 6.0V 0.4 V
EN Logic High Level Vin = 2.0V to 6.0 V 1.5 Vin V
EN Input Bias Current Vin = EN = Vout + 1V 0.01
Vout = 4.5V, Iout = 600 mA 440
Vout = 4.0V, Iout = 600 mA 470
Vout = 3.6V, Iout = 600 mA 500
Vout = 3.3V, Iout = 600 mA 530
Vout = 3.2V, Iout = 600 mA 550
f = 100 Hz, Iout = 10 mA 51
f = 1KHz, Iout = 10 mA 51
f = 10 KHz, Iout = 10 mA 45
Thermal Shutdown Shutdown Temperature 160
Thermal Shutdown Hysteresis V
Note1 : The drop out voltage varies depending on output voltage selection
Dropout is defined as V
Note 2: Time needed for V
IN
– V
OUT
OUT
= 3.3V, I
OUT
when V
to reach 90% of final value.
OUT
= 100mA 20
OUT
is 100mV below V
where Vin=Vout + 1V for nominal V
OUT
mV
μA
μA
dB
μS
μA
°C
°C
OUT
.
YB1231 MRev. 1.4 www.yobon.com.tw 3
Typical Characteristics
At TA=25℃, VIN=(V
+1V), CIN=C
OUT
OUT
YB1231 – HV600mA
Low-Noise LDO Regulator
=2.2μF, VEN=VIN, unless otherwise noted.
Dropout Voltage vs Output Voltage
600
500
400
300
200
ILOAD=1mA
100
Dropout Voltage (mV)
0
3 3.3 3.5 3.6 3.8 4 4.5
Ground Current vs. Input Voltage
140
120
100
80
60
40
Ground Current (uA)
20
0
123456
Output Voltage (V)
Input Voltage (V)
3.3V
4.5V
Dropout Voltage vs. Load Current
500
400
300
200
100
Dropout Voltage (mV)
0
10 100 200 300 400 500 600
Dropout Voltage vs. Temperature
600
500
400
300
200
100
Dropout Voltage (mV)
0
10 100 200 300 400 500 600
3.3V
4.5V
Load Current (mA)
3.3V at 25 C
3.3V at 85 C
Load Current (mA)
YB1231 MRev. 1.4 www.yobon.com.tw 4
YB1231 – HV600mA
Low-Noise LDO Regulator
3.36
3.355
3.35
3.345
3.34
3.335
3.33
Output Voltage (V)
3.325
3.32
25 35 45 55 65 75 85
Output Voltage vs. Temperature
3.3V at 10 mA load
Temperature (C)
YB1231 MRev. 1.4 www.yobon.com.tw 5
Functional Block Diagram
IN
YB1231 – HV600mA
Low-Noise LDO Regulator
EN
SHUTDOWN AND
POWER-ON CONTROL
ERROR
AMP
GND
THERMAL
SENSOR
Figure 3. Block Diagram
Functional Description
The YB1231 is an ultra-low-noise,
low-quiescent current, low-dropout linear
regulator. It is supplied in a SOT-23 /
SOT-25 / SOT-89 package for different
MOS DRIVER
WITH
LIMIT
REFERENCE
AND NOISE BYPASS
P
OUT
feedback voltage is too high, the pass
transistor gate is pulled high, allowing less
current to pass to the output. The parts are
available with preset output voltages
applications. These devices can supply
loads up to 600mA. As shown in the
Functional Block Diagram, the YB1231
consists of a reference and noise bypass
circuit, error amplifier, output drive
transistor, internal feedback voltage divider,
thermal sensor, and short circuit current
limiter. The internal reference is connected
to the error amplifier’s inverting input. The
error amplifier compares this reference with
the feedback voltage and amplifies the
difference. If the feedback voltage is lower
than the reference voltage, the
pass-transistor gate is pulled low. This
allows more current to pass to the output
and increases the output voltage. If the
ranging from 3.2V to 4.5V.
Stability
The YB1231 is a high performance LDO
emphasizing stability with low output
capacitance. It is able to maintain stability
with an output capacitor as low as 2.2 uF.
The output capacitor can also be increased
to optimize performance. The YB1231 will
remain stable and in regulation with no load,
unlike many other voltage regulators.
Internal P-Channel Pass Transistor
The YB1231 features a low impedance
P-channel MOSFET pass transistor. This
provides several advantages over similar
YB1231 MRev. 1.4 www.yobon.com.tw 6
YB1231 – HV600mA
Low-Noise LDO Regulator
designs using a PNP pass transistor,
including low operating power and longer
battery life. The YB1231 consumes only
100µA of quiescent current under most
conditions.
Output Short-Circuit Current Limit
The YB1231 includes a current limiter,
which monitors and controls the pass
transistor’s gate voltage, limiting the output
current to about 420mA, for example, in a
short-circuit output situation.
Shutdown
The YB1231 also features a low-power
active shutdown mode. It has a switch that
turns off the device when disabled. This
up, the output capacitor and output load are
charged with a reduced output current.
Shortly after the initial power up, the
soft-start feature is terminated and normal
operation is resumed.
Application Information
Enable/Shutdown
The YB1231 comes with an active-high
enable pin that allows the regulator to be
enabled. Forcing the enable pin low
disables the regulator and puts it into the
shutdown mode. This pin cannot be left
floating as it may cause an undetermined
state.
Input/Output Capacitor
allows the output capacitor and load to
discharge and de-energize the load. In the
shutdown mode, the internal functional
blocks, such as voltage reference and the
error amplifier, are turned off completely,
and the quiescent current is less than 1µA.
Thermal Protection Shutdown
The thermal protection shutdown function
protects the device from operating in over
temperature condition. When the junction
temperature exceeds +160°C, the thermal
sensor signals the shutdown logic, turning
off the pass transistor and allowing the IC
to cool down. The thermal sensor turns the
pass transistor on again after the IC’s
junction temperature drops to +140°C.
It is recommended to use a 2.2µF capacitor
on the YB1231 input and a 2.2µF capacitor
on the output. For high regulation
performance, larger input capacitor values
and lower ESRs provide better noise
rejection and line-transient response. The
output noise, load-transient response,
stability, and power-supply rejection can be
improved by using large output capacitors.
Low ESR ceramic capacitors provide
optimal performance and save space.
Soft-Start Circuitry
The YB1231 includes a soft-start circuitry to
limit inrush current at turn-on. During power
YB1231 MRev. 1.4 www.yobon.com.tw 7
SOT-25 Package Information
YB1231 – HV600mA
Low-Noise LDO Regulator
YB1231 MRev. 1.4 www.yobon.com.tw 8
SOT-23 Package Information
YB1231 – HV600mA
Low-Noise LDO Regulator
NOTE:
1. ALL DIMENSIONS ARE IN MILLIMETERS.
2. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSION OR GATE BURRS SHALL NOT
EXCEED 0.25mm PER END.
DIMENSION E1 DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSION. INTERLEAD
FLASH OR PROTRUSION SHALL NOT EXCEED 0.25 PER SIDE.
3. THE PACKAGE TOP MAY BE SMALLER THAN THE PACKAGE
BOTTOM.
DIMENSIONS D AND E1 ARE DETERMINED AT THE OUTERMOST EXTREMES OF THE
PLASTIC BODY EXCLUSIVE OF MOLD FLASH, THE BAR BURRS. GATE BURRS AND
INTERLEAD FLASH, BUT INCLUDING ANY MISMATCH BETEEN THE TOP AND BOTTOM OF
THE PLASTIC BODY..
4. DIMENSION“b”DOES NOT INCLUDE DAMBAR PROTRUSION.
ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.08mm
TOTAL IN EXCESS OF THE “b”DIMENSION AT MAXIMUM
MATERIAL CONDITION. THE DAMBAR CANNOT BE LOCATED
ON THE LOWER RADIUS OF THE FOOT . MINMUM SPACE BETWEEN
PROTRUSION AND AN ADJACENT LEAD SHALL NOT BE LESS
THAN 0.07mm
5. LEAD FRAME MATERIAL:EFTEC 64T
YB1231 MRev. 1.4 www.yobon.com.tw 9
SOT-89 Package Information
YB1231 – HV600mA
Low-Noise LDO Regulator
YB1231 MRev. 1.4 www.yobon.com.tw 10
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