YB1253ST25X260 [YOBON]
300mA, Low Power, High PSRR LDO Regulator;
| 型号： | YB1253ST25X260 |
| 厂家： | 
YOBON TECHNOLOGIES,INC. |
| 描述： | 300mA, Low Power, High PSRR LDO Regulator |
| 文件： | 总11页 (文件大小：476K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
YB1253
300mA, Low Power, High PSRR LDO Regulator
Description
Features
The YB1253 is a series of ultra-low-noise,
high PSRR, and low quiescent current low
dropout (LDO) linear regulators with 2.0%
output voltage accuracy. The YB1253
regulators achieve a low 300mA dropout at
300mA load current of 3.6V output and are
available in voltages ranging from 1.2V to
3.6V with 0.1 V per step (custom voltage is
considerate at request).
• High Accuracy Output Voltage : + 2%
• Wide Output Voltage Range : 1.2~3.6V
• Ultra-Low-Noise Low-Drop-Out
• Typical Output Current : 300 mA
• Low Quiescent Current: ~10μA
• 300mV Dropout at 300mA 3.6V Output
• Stable with 1.0μF Ceramic Capacitor
• Only Need Input and Output Capacitors
• Thermal Protection Shutdown
• Auto discharge function
• Green Package (RoHS) Available
The YB1253 regulators are optimized to
work with low-ESR and low cost ceramic
capacitors, reducing the amount of board
space critical in portable devices. The
YB1253 requires only 1.0μF output
capacitor for stability with any load and
consumes less than 1μA in shutdown
mode.
Applications
• PDA, Notebook, PC Computers
• DSC, Cellular phones
• PCMCIA Cards, PC Cameras
• USB Based Portable Devices
• GSM/GPRS/3G RF Transceiver
• Wireless LANs
• Bluetooth Portable Radios
• Battery-Powered Devices
Built-in thermal shutdown and short-circuit
current limit offer secure protection against
fault operation. YB1253 regulators also
include an auto-discharge function. The
YB1253 regulators are available in SOT-23
/ SOT-25 / SOT-89 packages.
Typical Application Circuitry
Input
Cin=1uF
Output
Cout=1uF
VIN VOUT
YB1253
Input
Output
Cout=1uF
VIN VOUT
YB1253
Cin=1uF
ON
GND
EN
OFF
GND
Figure 1-2 : SOT-23 application circuit
Figure 1-1 : SOT-25 application circuit
YB1253 Rev. 1.5
www.yobon.com.tw
1
YB1253
300mA, Low Power, High PSRR LDO Regulator
Pin Configuration
NC
VIN
VOUT
3
5
4
SOT-89
SOT-89R
SOT-23
SOT-25
1
2
3
1
2
3
1
2
1
2
3
VOUT
EN
VIN
GND VIN
VOUT GND
GND
VOUT
VIN
GND
Figure 2 : pin configuration
Pin Description
Table 1
Pin Name
Pin Function
Unregulated Input Supply. Bypass with a capacitor to GND
VIN
GND
EN
Ground pin
Pull high to enable the regulator
No connection is required
Regulated Output Voltage
NC
VOUT
YB1253 Rev. 1.5
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2
YB1253
300mA, Low Power, High PSRR LDO Regulator
Ordering Information
X
YB1253
*Order exam ple :
Output Voltage
120 : 1.2V
130 : 1.3V
:
YB1253 ST89X250 for YB1253 of
2.5V output and SO T-89 package
*Shipping Quantity :
SO T-23
SO T-25
SO T-89
: 3000 units tape & reel
: 3000 units tape & reel
: 1000 units tape & reel
360 : 3.6V
SO T-89R : 1000 units tape & reel
*Only green package
X : fixed
Package Type
ST23 : SOT-23
ST25 : SOT-25
ST89 : SOT-89
ST8R : SO T-89R
Marking Information
Absolute Maximum Ratings (Note 1)
Recommended Operating Conditions
(Note 2)
Supply Voltage................................-0.3V to 6.0V
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℃
ESD Susceptibility (HBM)…………… ………2KV
ESD Susceptibility (MM) ............................. 200V
Input Supply Voltage.........................2V to 5.5V
Operating Temperature..............-40℃ to +85℃
Thermal Information (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 = 25℃ on a low effective thermal conductivity board.
YB1253 Rev. 1.5
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3
YB1253
300mA, Low Power, High PSRR LDO Regulator
Electrical Characteristics
Table 2
TA = 25℃, VIN = ( VOUT + 1 V ), CIN = COU T = 1.0μF, VEN = VIN, unless otherwise
Function Parameter
Conditions
Min
Typ
Max
Units
Input Voltage Range
Output Voltage, VOUT
2.0
1.2
5.5
3.6
V
V
Predefined
IOUT = 10mA, VOUT >= 1.3V
-2.0
+2.0
%
Output Voltage Accuracy
Output Current Limit
I
OUT = 10mA, VOUT = 1.2V
0
+4.0
%
Short-circuit output
500
300
350
430
600
900
10
mA
Vout = 3.6V, Iout = 300 mA
Vout = 3.3V, Iout = 300 mA
Vout = 2.8V, Iout = 300 mA
Vout = 1.8V, Iout = 300 mA
Vout = 1.2V, Iout = 300 mA
Iground = Iin - Iout
Dropout Voltage (Note 1)
mV
Ground Current
μA
Line Regulation
Vin = (Vout+1V) to 5.5V, Iout =10mA
Iout = 1mA to 300 mA
EN = Vin=0V
0.10
0.005
0.20
%/V
Load Regulation
0.01 %/mA
Shutdown Supply Current
Ripple Rejection (PSRR)
Start Up Delay (Note 3)
1
μA
dB
μS
mS
mS
V
(Note 2)
50
200
1
Rload=100ohm
Rload=10K ohm, VOUT=1.5V
Rload=10K ohm, VOUT=1.2V
Vin = 2.0V to 5.5V
Shutdown Delay
1
EN Logic Low Level
EN Logic High Level
EN Input Bias Current
Thermal Shutdown
Thermal Hysteresis
0.4
Vin
Vin = 2.0V to 5.5V
1.2
V
Vin = EN = 3V
1.5
160
20
μA
°C
°C
Shutdown Temperature
Note 1: The dropout 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
.
Note 2: PSRR is tested at Vin=3.8+1Vppac, Vout=2.8V, I_load=1mA.
Note 3: Time needed for VOUT to reach 90% of final value.
YB1253 Rev. 1.5
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4
YB1253
300mA, Low Power, High PSRR LDO Regulator
Typical Characteristics
At TA=25℃, VIN=(VOUT+1V), CIN=COUT=1.0μF, VEN=VIN, unless otherwise noted.
Output Curent VS Dropout voltage
Input voltage VS Quiescent current
1000
900
800
700
600
500
400
300
200
100
0
45
40
35
30
25
20
15
10
5
Iout= 300mA
Iout= 0
1.3V
3.3V
1.8V
3.3V
1.8V
0
0
50
100
150
200
250
300
350
2
2.5
3
3.5
4
4.5
5
5.5
Output current (mA)
input voltage (V)
Output voltage VS Temperature
Output voltage VS Output current
3.5
3
3.5
3
3.3V
3.3V
Iout= 300mA
2.5
2
2.5
2
1.8V
1.8V
1.5
1
1.5
1
0.5
0
0.5
0
50
60
70
80
90
100
110
120
130
0
50
100
150
200
250
300
Temperature (degree)
Output current (mA)
Startup delay time
Shutdown delay time
Rout = 10Ω
Rout = 10Ω
EN
Vout = 3.3V
Vout = 3.3V
EN
Vout
Vout
YB1253 Rev. 1.5
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5
YB1253
300mA, Low Power, High PSRR LDO Regulator
Input transient response
Load transient response
Iout=100mA
Vout =3.3V
Iout
Vout
VIN
250mA
10mA
Vout
6V
VIN=4.3V
4V
Vout =3.3V
Power supply rejection ratio
Power supply rejection ratio
Vin=3.8VDC + 1VP-P, Cout=1.0μF
Vout=2.8V
Vin=3.8VDC + 1VP-P, Cout=1.0μF
Vout=2.8V
Iout=1mA
Iout=10mA
YB1253 Rev. 1.5
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6
YB1253
300mA, Low Power, High PSRR LDO Regulator
Functional Block Diagram
VIN
EN
Vref
VOUT
Thermal
shutdown
Short Circuit
Protection
GND
Figure 3 : Function diagram
Functional Description
The YB1253 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
applications. YB1253 can supply load current up to
300mA (typical operation, not maximum) with good
line and load regulation. Output voltages are preset
and ranging from 1.2V to 3.6V.
and amplifies the difference. If the feedback voltage
is lower than the reference voltage, the gate of the
pass-transistor is pulled low. This allows more
current to pass to the output and increases the
output voltage. If the feedback voltage is too high,
the gate of the pass transistor is pulled high,
allowing less current to pass to the output.
Stability
As shown in the Functional Block Diagram, the
YB1253 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 YB1253 is a high performance LDO
emphasizing stability with low output capacitance. It
is able to maintain stability with an output capacitor
as low as 1.0µF. The output capacitor can also be
increased to optimize performance. The YB1253 will
remain stable and in regulation with no load, unlike
many other voltage regulators.
The internal reference is connected to the error
amplifier’s inverting input. The error amplifier
compares this reference with the feedback voltage
YB1253 Rev. 1.5
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7
YB1253
300mA, Low Power, High PSRR LDO Regulator
Internal P-Channel Pass Transistor
Application Information
The YB1253 features a low impedance 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 YB1253 consumes only 10µA of
quiescent current under most conditions.
Enable/Shutdown
The YB1253 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.
Output Short-Circuit Current Limit
Input/Output Capacitor
The YB1253 includes a current limiter, which
monitors and controls the pass transistor’s gate
voltage, limiting the output current to about 500mA,
for example, in a short-circuit output situation.
It is recommended to use a 1.0µF capacitor in the
YB1253 input and a 1.0µF capacitor in 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.
Shutdown
The YB1253 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.
YB1253 Rev. 1.5
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8
YB1253
300mA, Low Power, High PSRR LDO Regulator
SOT-25 Package Information
E1
A 1
A 2
A
E
L2
GAUGE PLANE
L
milimeters
Inches
MAX.
.057
.006
.051
.019
.0078
.118
.0669
.118
MIN.
.037
MAX.
MIN.
0.95
0.05
0.90
0.30
0.08
2.84
1.50
2.60
A
A1
A2
b
1.45
0.15
1.30
0.50
0.20
3.00
1.70
3.00
.002
.035
.0118
.0031
.1118
.059
C
D
E
E1
e
.102
0.95 BSC.
1.90 BSC.
0.35 0.55
.0374 BSC.
.0748 BSC.
e1
L
.0137
.0216
L1
L2
t
0.10 BSC.
0.60 REF.
.0039 BSC.
.0236 REF.
0°
8°
0°
8°
YB1253 Rev. 1.5
www.yobon.com.tw
9
YB1253
300mA, Low Power, High PSRR LDO Regulator
SOT-23 Package Information
A1
A2
E1
A
E
L2
GAUGE PLANE
L
milimeters
Inches
MAX.
MIN.
.037
MAX.
MIN.
0.95
0.05
0.90
0.30
0.08
2.84
1.50
2.60
A
1.45
0.15
1.30
0.50
0.20
3.00
1.70
3.00
.057
.006
.051
.019
A1
A2
b
.002
.035
.0118
.0031
.1118
.059
C
.0078
.118
D
E
.0669
.118
E1
e
.102
0.95 BSC.
1.90 BSC.
0.35 0.55
.0374 BSC.
.0748 BSC.
.0137 .0216
e1
L
L1
L2
t
0.10 BSC.
0.60 REF.
.0039 BSC.
.0236 REF.
0°
8°
0°
8°
YB1253 Rev. 1.5
www.yobon.com.tw
10
YB1253
300mA, Low Power, High PSRR LDO Regulator
SOT-89 Package Information
E1
E
L
milimeters
MAX.
Inches
MAX.
.063
.019
.022
.072
.017
.181
.102
.167
MIN.
.055
.014
.017
.059
.014
.173
.090
.155
MIN.
1.40
0.36
0.44
1.50
0.35
4.40
2.29
3.94
A
1.60
0.48
0.56
1.83
0.44
4.60
2.60
4.25
b
b1
b2
C
D
E
E1
e
1.50 BSC.
3.00 BSC.
0.89 1.20
.059 BSC.
.118 BSC.
e1
L
.035
.047
YB1253 Rev. 1.5
www.yobon.com.tw
11
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