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 2.2
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.
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
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
Typical Application Circuitry
YB1231 MRev. 1.4
www.yobon.com.tw
1
YB1231 – HV600mA
Low-Noise LDO Regulator
Pin Configuration
Pin Description
Table 1
Pin Name
VIN
GND
EN
VOUT
Pin Function
Unregulated Input Supply. Bypass with a capacitor to GND.
Ground pin.
Pull high to enable the regulator.
Regulated Output Voltage. Bypass with a capacitor to GND.
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
IN
+0.3V)
Output Short-Circuit Duration ........................... Infinite
Junction Temperature Range........................... +150℃
Storage Temperature Range ............. -65℃ to +150℃
Lead Temperature............................................ +250℃
Recommended Operating Conditions
Input Supply Voltage................................ 2V to 6.0V
Operating Temperature..................... -40℃ to +85℃
Thermal Resistance (SOT-23/25,
θ
JC
) ........ 140℃/W
Thermal Resistance (SOT-23/25,
θ
JA
)......... 280℃/W
Thermal Resistance (SOT-89,
θ
JC
) ............... 46℃/W
Thermal Resistance (SOT-89,
θ
JA
).............. 180℃/W
Thermal Power Dissipation (SOT-23/25, P
D
)....0.4W
Thermal Power Dissipation (SOT-89, P
D
).......0.55W
Electrical Characteristics
Table 2
T
A
= 25℃, V
IN
= ( V
OUT
+ 1 V ), C
IN
= C
OU T
= 2.2μF, V
EN
= V
IN
Function Parameter
Input Voltage Range
Output Voltage
Output Voltage Accuracy
Output Current Limit
Predefined
I
OUT
= 10mA
Conditions
Min
3.5
3.2
-2.0
Typ
Max
6.0
4.5
+2.0
Units
V
V
%
mA
Short-circuit output
Vout = 4.5V, Iout = 600 mA
Vout = 4.0V, Iout = 600 mA
420
440
470
500
530
550
100
0.4
1.7
0.01
51
51
45
36
100
0.4
1.5
0.01
160
20
Vin
160
Dropout Voltage (
Note 1
)
Vout = 3.6V, Iout = 600 mA
Vout = 3.3V, Iout = 600 mA
Vout = 3.2V, Iout = 600 mA
mV
Ground Current
Line Regulation
Load Regulation
Shutdown Supply Current
Iground = Iin - Iout
Vin = (Vout + 1V) to 6V, Iout = 10 mA
Iout = 1mA to 600 mA
EN = 0.4V
f = 100 Hz, Iout = 10 mA
μA
%/V
%
μA
Ripple Rejection (PSRR)
f = 1KHz, Iout = 10 mA
f = 10 KHz, Iout = 10 mA
dB
Shutdown Exit Delay
(Note 2)
EN Logic Low Level
EN Logic High Level
EN Input Bias Current
Thermal Shutdown
Thermal Shutdown Hysteresis
Vout = 3.3V, Rload = 11 ohm
Vin = 2.0V to 6.0V
Vin = 2.0V to 6.0 V
Vin = EN = Vout + 1V
Shutdown Temperature
V
OUT
= 3.3V, I
OUT
= 100mA
μS
V
V
μA
°C
°C
Note1 :
The drop out voltage varies depending on output voltage selection
Dropout is defined as V
IN
– V
OUT
when V
OUT
is 100mV below V
OUT
where Vin=Vout + 1V for nominal V
OUT
.
Note 2:
Time needed for V
OUT
to reach 90% of final value.
YB1231 MRev. 1.4
www.yobon.com.tw
3
YB1231 – HV600mA
Low-Noise LDO Regulator
Typical Characteristics
At T
A
=25℃, V
IN
=(V
OUT
+1V), C
IN
=C
OUT
=2.2μF, V
EN
=V
IN
, unless otherwise noted.
Dropout Voltage vs Output Voltage
600
Dropout Voltage (mV)
Dropout Voltage (mV)
500
400
300
200
100
I
LOAD
=1mA
0
3
3.3
3.5
3.6
3.8
4
4.5
Output Voltage (V)
500
400
300
200
100
0
10
100
200
300
400
500
600
Load Current (mA)
3.3V
4.5V
Dropout Voltage vs. Load Current
Ground Current vs. Input Voltage
140
Dropout Voltage vs. Temperature
600
Dropout Voltage (mV)
500
400
300
200
100
0
10
100
200
300
400
500
600
3.3V at 25 C
3.3V at 85 C
Ground Current (uA)
120
100
80
60
40
20
0
1
2
3
4
5
6
Input Voltage (V)
3.3V
4.5V
Load Current (mA)
YB1231 MRev. 1.4
www.yobon.com.tw
4
YB1231 – HV600mA
Low-Noise LDO Regulator
Output Voltage vs. Temperature
3.36
3.355
Output Voltage (V)
3.35
3.345
3.34
3.335
3.33
3.325
3.32
25
35
45
55
65
75
85
Temperature (C)
3.3V at 10 mA load
YB1231 MRev. 1.4
www.yobon.com.tw
5
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