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
YB1231 Rev.1.6
Figure 1-2: SOT-23/SOT-89 Application Circuit
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YB1231
HV600mA, Low-Noise LDO Regulator
Ordering Information
Marking Information
Absolute Maximum Ratings
(Note 1)
Supply Voltage............................ -0.3V to 6V
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
(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,
θ
JA
) ... 280℃/W
Thermal Resistance (SOT-89,
θ
JA
)......... 180℃/W
Internal Power Dissipation (SOT-23/25, P
D
) . 0.4W
Internal Power Dissipation (SOT-89, P
D
)..... 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
JA
is measured in free air at T
A
= 25℃ on a low effective thermal conductivity board.
YB1231 Rev.1.6
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YB1231
HV600mA, Low-Noise LDO Regulator
Typical Performance Characteristics
V
IN
= ( V
OUT
+ 1V ), C
IN
= C
OUT
= 2.2μF, V
EN
= V
IN
, T
A
=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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