Datasheet YB1231ST23X320, YB1231ST23X330, YB1231ST23X340, YB1231ST23X350, YB1231ST23X360 Datasheet (Yobon) [ru]
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YB1231
HV600mA, Low-Noise LDO Regulator
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 requires only 2.2μF output
capacitor for stability with any load and
consumes less than 1μA in shutdown
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 : 600mA
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
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 Circuit
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
Figure 1-1: SOT-25 Application Circuit Figure 1-2: SOT-23/SOT-89 Application Circuit
YB1231 Rev.1.6 www.yobon.com.tw 1
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Pin Configuration
YB1231
HV600mA, Low-Noise LDO Regulator
Figure 2: Pin Configuration
Pin Description
Table 1
Name Description
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.
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Ordering Information
YB1231
HV600mA, Low-Noise LDO Regulator
Marking Information
Absolute Maximum Ratings
Supply Voltage............................ -0.3V to 6V
Output Voltage................ -0.3V to (VIN+0.3V)
Output Short-Circuit Duration..............Infinite
Junction Temperature Range............ +150℃
Storage Temperature Range...... -65℃ to +150℃
Lead Temperature............................. +250℃
(Note 1)
Recommended Operating Conditions
(Note 2)
Input Supply Voltage............... 2.0V to 5.5V
Operating Temperature........-40℃ to +85℃
Thermal In formation (Note 3)
Thermal Resistance (SOT-23/25, θJA) ... 280℃/W
Thermal Resistance (SOT-89, θJA)......... 180℃/W
Internal Power Dissipation (SOT-23/25, PD).0.4W
Internal Power Dissipation (SOT-89, PD)..... 0.55W
Note:
1. Exceeding these ratings may damage the device.
2. The device is not guaranteed to function outside of its operating conditions.
3. θ
is measured in free air at TA = 25℃ on a low effective thermal conductivity board.
JA
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Electrical Characteristics
YB1231
HV600mA, Low-Noise LDO Regulator
Table 2 V
IN
= ( V
+ 1V ), CIN = C
OUT
Description Symbol Test Conditions MIN TYP MAX Units
Input Voltage Range
Output Voltage
Output Voltage Accuracy
Output Current Limit
Dropout Voltage (Note 1)
Ground Current
Line Regulation
Load Regulation
Shutdown Supply Current
Ripple Rejection (PSRR)
Shutdown Exit Delay (Note 2)
EN Logic Low Level
EN Logic High Level
EN Input Bias Current
Thermal Shutdown
Thermal Hysteresis
OUT
V
IN
V
OUT
ΔV
OUT
I
SC
V
DROP
I
G
ΔV
LINE
ΔV
LOAD
I
SD
PSRR
V
IL
V
IH
I
BEN
T
SD
T
HYS
= 2.2μF, VEN = VIN, TA=25°C, unless otherwise noted.
Predefined
I
= 10mA
OUT
Short-Circuit Output
V
= 4.5V, I
OUT
V
= 4.0V, I
OUT
V
= 3.6V, I
OUT
V
= 3.3V, I
OUT
V
= 3.2V, I
OUT
Iground = I
V
=(V
IN
I
= 1mA to 600mA
OUT
EN = 0V
IN
+1V) to 5.5V, I
OUT
f = 100Hz, I
f = 1KHz, I
OUT
f = 10KHz, I
V
= 3.3V, Rload = 11 ohm
OUT
= 2.0V to 5.5V
V
IN
V
= 2.0V to 5.5V
IN
V
= EN = V
IN
Shutdown Temperature
V
= 3.3V, I
OUT
= 600mA
OUT
= 600mA
OUT
= 600mA
OUT
= 600mA
OUT
= 600mA
OUT
- I
OUT
= 10mA
OUT
= 10mA
= 10mA
OUT
+1V
OUT
= 100mA
OUT
OUT
=10mA
2.0 5.5 V
3.2 4.5 V
-2.0 +2.0 %
420 mA
440
470
500
530
550
100 160 μA
0.4 %/V
1.7 %
1 μA
51
51
45
36 100 μs
0.4 V
1.5 V
0.01 μA
160 °C
20 °C
mV
dB
V
IN
Note :
1. The drop out voltage varies depending on output voltage selection. Dropout is defined as V
V
is 100mV below nominal V
OUT
2. Time needed for V
to reach 90% of final value.
OUT
where VIN = V
OUT
+ 1V for nominal V
OUT
OUT
.
IN
– V
OUT
when
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YB1231
HV600mA, Low-Noise LDO Regulator
Typical Performance Characteristics
V
= ( V
IN
+ 1V ), CIN = C
OUT
= 2.2μF, VEN = VIN, TA=25°C, unless otherwise noted.
OUT
Dropout Voltage vs. Output Voltage Dropout Voltage vs. Load Current
Ground Current vs. Input Voltage Dropout Voltage vs. Temperature
Load Transient Response (1) Load Transient Response (2)
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YB1231
HV600mA, Low-Noise LDO Regulator
Shutdown Exit Delay Shutdown Delay
Output Voltage vs. Temperature Output Noise Measurement
Line Transient Response (10mA) PSRR vs. Frequency
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Function Block
IN
YB1231
HV600mA, Low-Noise LDO Regulator
EN
SHUTDOWN AND
POWER-ON CONTROL
ERROR
AMP
GND
THERMAL
SENSOR
Figure 3: Function Block
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
allows more current to pass to the output
and increases the output voltage. If the
feedback voltage is too high, the pass
transistor gate is pulled high, allowing less
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
YB1231 Rev.1.6 www.yobon.com.tw 7
current to pass to the output. The parts are
available with preset output voltages
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 2.2μF.
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
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YB1231
HV600mA, Low-Noise LDO Regulator
P-channel MOSFET pass transistor. This
provides several advantages over similar
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
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.
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
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
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Package Information (SOT-23)
YB1231
HV600mA, Low-Noise LDO Regulator
E1
E
YB1231 Rev.1.6 www.yobon.com.tw 9
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Package Information (SOT-25)
YB1231
HV600mA, Low-Noise LDO Regulator
e1
D
e
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Package Information (SOT-89)
YB1231
HV600mA, Low-Noise LDO Regulator
L
A
C
NOTICE:
y The information described herein is subject to change without notice.
y Yobon does not assume any responsibility for use of any circuitry or applications described herein, nor
does it convey any patent license.
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