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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
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 : 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
„ 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 Circuit
Figure 1-1: SOT-25 Application Circuit
Figure 1-2: SOT-23/SOT-89 Application Circuit
YB1231 Rev.1.6
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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.
YB1231 Rev.1.6
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Ordering Information
YB1231
HV600mA, Low-Noise LDO Regulator
Marking Information
Absolute Maximum Ratings (Note 1)
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...... -65to +150
Lead Temperature............................. +250
Recommended Operating Conditions
(Note 2)
Input Supply Voltage............... 2.0V to 5.5V
Operating Temperature........-40to +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. θJA is measured in free air at TA = 25on a low effective thermal conductivity board.
YB1231 Rev.1.6
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YB1231
HV600mA, Low-Noise LDO Regulator
Electrical Characteristics
Table 2 VIN = ( VOUT + 1V ), CIN = COUT = 2.2μF, VEN = VIN, TA=25°C, unless otherwise noted.
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
VIN 2.0 5.5
VOUT Predefined
3.2 4.5
ΔVOUT IOUT = 10mA
-2.0 +2.0
ISC Short-Circuit Output
420
VOUT = 4.5V, IOUT = 600mA
440
VOUT = 4.0V, IOUT = 600mA
470
VDROP VOUT = 3.6V, IOUT = 600mA
500
VOUT = 3.3V, IOUT = 600mA
530
VOUT = 3.2V, IOUT = 600mA
550
IG Iground = IIN - IOUT
100 160
ΔVLINE VIN=(VOUT+1V) to 5.5V, IOUT=10mA
0.4
ΔVLOAD IOUT = 1mA to 600mA
1.7
ISD EN = 0V
1
f = 100Hz, IOUT = 10mA
51
PSRR f = 1KHz, IOUT = 10mA
51
f = 10KHz, IOUT = 10mA
45
VOUT = 3.3V, Rload = 11 ohm
36 100
VIL VIN = 2.0V to 5.5V
0.4
VIH VIN = 2.0V to 5.5V
1.5 VIN
IBEN VIN = EN = VOUT +1V
0.01
TSD Shutdown Temperature
160
THYS VOUT = 3.3V, IOUT = 100mA
20
V
V
%
mA
mV
μA
%/V
%
μA
dB
μs
V
V
μA
°C
°C
Note :
1. The drop out voltage varies depending on output voltage selection. Dropout is defined as VIN – VOUT when
VOUT is 100mV below nominal VOUT where VIN = VOUT + 1V for nominal VOUT.
2. Time needed for VOUT to reach 90% of final value.
YB1231 Rev.1.6
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YB1231
HV600mA, Low-Noise LDO Regulator
Typical Performance Characteristics
VIN = ( VOUT + 1V ), CIN = COUT = 2.2μF, VEN = VIN, TA=25°C, unless otherwise noted.
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)
YB1231 Rev.1.6
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