TS9008
300mA High PSRR Low Noise CMOS LDO
SOT-25
Pin Definition:
1. Input
2. Ground
3. Enable
4. Bypass
5. Output
SOT-23
Pin Definition:
1. Input
2. Output
3. Ground
General Description
The TS9008 is a low dropout, high PSRR, low noise linear regulator with very low quiescent. It can supply
300mA output current with low dropout about 250mV. The Device includes pass element, error amplifier, band-
gap, current-limit and thermal shutdown circuitry. The characteristics of low dropout voltage and less quiescent
current make it good for some critical current application, for example, some battery powered devices. The
typical quiescent current is approximately 30µA. In the shutdown mode, the maximum supply current is less
than 1uA. Built-in current-limit and thermal-shutdown functions prevent any fault condition from IC damage
Features
●
●
●
●
●
●
●
●
Input voltage range 2.8V~5.5V
250mV dropout at 300mA load
300mA output Current
Low quiescent current 30µA (Typ.)
Max. supply current <1µA at shutdown mode
Fixed output voltage
Current limit and thermal shutdown protection
High PSRR 73db @ 1kHz
Ordering Information
Part No.
Package
Packing
TS9008xCX RFG
SOT-23
3kpcs / 7” Reel
TS9008xCX5 RFG
SOT-25
3kpcs / 7” Reel
Note:
“G” denote for Halogen Free Product
Where
x
denotes voltage option, available are
D=
1.8V,
S=
3.3V
Applications
●
●
●
●
●
Palmtops, PDA and Notebook Computers
DSC, Handset Camera Modules
PCMCIA Cards, PC Cameras
USB Based Portable Devices (MPS, PMP)
GSM/GPRS/3G RF Transceiver Modules
Block Diagram
VIN
Error
Amp
VOUT
Typical Application Circuit
TS9008
Current
Limit
EN
Enable
- +
Bandgap
Thermal
Shutdown
BP
GND
1/9
Version: E14
TS9008
300mA High PSRR Low Noise CMOS LDO
Absolute Maximum Ratings
Parameter
VIN Pin Voltage
Output Voltage
Enable Voltage
Power Dissipation
Storage Temperature Range
Operating Temperature Range
Junction Temperature
Thermal Resistance from Junction to case
Symbol
V
IN
V
OUT
V
EN
P
D
T
STG
T
OP
T
J
R
θJC
Limit
GND - 0.3 to GND + 6
GND - 0.3 to VIN + 0.3
GND - 0.3 to GND + 6
350
-40 to +150
-40 to +85
-40 to +125
230
Unit
V
V
V
mW
°C
°C
°C
°C/W
°C/W
Thermal Resistance from Junction to ambient
R
θJA
280
2
Note:
R
θJA
is measured with the PCB copper area of approximately 1 in (Multi-layer).
Electrical Characteristics
(V
IN
=V
OUT
+1V or V
IN
=2.8V whichever is greater, C
IN
=C
OUT
=1uF, T
A
=25°C, unless otherwise noted)
Characteristics
Input Voltage
Output Voltage Accuracy
Quiescent Current
Dropout Voltage
(Note2)
Current Limit
Line Regulation
Load Regulation
(Note3)
Ripple Rejection
Symbol
V
IN
∆V
OUT
I
Q
V
DROP
I
LIMIT
∆V
LINE
∆V
LOAD
PSRR
V
ENH
V
ENL
I
EH
I
SD
T
C
T
S
V
EN
=V
IN
(Note1)
I
OUT
=1mA
I
OUT
=0mA
Conditions
Min
2.8
-2
--
Typ
--
--
30
1000
250
--
1
6
73
60
--
--
--
--
50
160
--
Max
5.5
+2
60
--
--
Units
V
%
µA
mV
mA
1.5V＜V
OUT
≦2.0V
I
OUT
=300mA
R
LOAD
=1Ω
I
OUT
=1mA,
V
IN
=V
OUT
+1V to 5V
I
OUT
=0m~150mA
C
OUT
=1uF,
I
OUT
=1mA
F=1KHz
F=10K
2.8V＜V
OUT
≦3.3V
--
--
300
--
--
--
--
1.4
--
--
--
--
--
5
20
--
--
--
0.4
0.1
1
--
--
mV
mV
dB
Enable Input Threshold
Enable Pin Current
Shutdown Current
Temperature Coefficient
Temperature Shutdown
Temperature
V
µA
µA
ppm/°C
ºC
ºC
V
IN
=3.6V, V
EN
=0V
I
OUT
=1mA, V
IN
=5V
T
SH
--
25
--
Shutdown Hysterisis
Note:
1. Minimum V
IN
voltage is defined by output adds a dropout voltage.
2. The dropout voltage is defined as V
IN
-V
OUT
, which is measured when V
OUT
drop about 100mV.
3. Regulation is measured at constant junction temperature by using pulsed testing with a low ON time.
2/9
Version: E14
TS9008
300mA High PSRR Low Noise CMOS LDO
Function Description
A minimum of 1uF capacitor must be connected from V
OUT
to ground to insure stability. Typically a large storage
capacitor is connected from V
IN
to ground to ensure that the input voltage does not sag below the minimum dropout
voltage during the load transient response. This pin must always be dropout voltage higher than V
OUT
in order for
the device to regulate properly
Application Information
Like any low-dropout regulator, the TS9008 requires input and output decoupling capacitors. The device is
specifically designed for portable applications requiring minimum board space and smallest components. These
capacitors must be correctly selected for good performance. Please note that linear regulators with a low dropout
voltage have high internal loop gains which require care in guarding against oscillation caused by insufficient
decoupling capacitance.
Capacitor Selection
Normally, use a 1µF capacitor on the input and a 1µF capacitor on the output of the TS9008. Larger input capacitor
values and lower ESR provide better supply-noise rejection and transient response. A large value output capacitor
may be necessary if large, fast transients are anticipated and the device is located several inches from the power
source. The capacitors is recommended to use 1uF X5R or X7R dielectric ceramic capacitors with 30mΩ to 50mΩ
ESR range between device outputs to ground for transient stability.
Input-Output (Dropout) Voltage
A regulator's minimum input-to-output voltage differential (dropout voltage) determines the lowest usable supply
voltage. In battery-powered systems, this determines the useful end-of-life battery voltage. Because the device
uses a PMOS, its dropout voltage is a function of drain-to source on-resistance, RDS(ON), multiplied by the load
current:
V
DROPOUT
= V
IN
-V
OUT
= R
DS (ON)
x I
OUT
Current limit and Thermal Shutdown Protection
In order to prevent overloading or thermal condition from damaging the device, TS9008 regulator has internal
thermal and current limiting functions designed to protect the device. It will rapidly shut off PMOS pass element
during overloading or over temperature condition.
Thermal Considerations
The TS9008 series can deliver a current of up to 300mA over the full operating junction temperature range.
However, the maximum output current must be dated at higher ambient temperature to ensure the junction
temperature does not exceed 125°C. With all possible conditions, the junction temperature must be within the
range specified under operating conditions. Power dissipation can be calculated based on the output current and
the voltage drop across regulator.
P
D
= (V
IN
- V
OUT
) I
OUT
The final operating junction temperature for any set of conditions can be estimated by the following thermal
equation:
P
D (MAX)
= (T
J(MAX)
- T
A
) / R
θJA
Where T
J(MAX)
is the maximum junction temperature of the die (125°C) and TA is the maximum ambient
temperature. The junction to ambient thermal resistance (R
θJA
) for SOT-25 package at recommended minimum
footprint is 250°C/W.
3/9
Version: E14
TS9008
300mA High PSRR Low Noise CMOS LDO
PCB Layout
An input capacitance 1µF is required between the TS9008 input pin and ground (the amount of the capacitance
may be increased without limit), this capacitor must be located a distance of not more than 1cm from the input and
return to a clean analog ground. Input capacitor can filter out the input voltage spike caused by the surge current
due to the inductive effect of the package pin and the printed circuit board’s routing wire. Otherwise, the actual
voltage at the VIN pin may exceed the absolute maximum rating. The output capacitor also must be located a
distance of not more than 1cm from output to a clean analog ground. Because it can filter out the output spike
caused by the surge current due to the inductive effect of the package pin and the printed circuit board’s routing
wire.
4/9
Version: E14
TS9008
300mA High PSRR Low Noise CMOS LDO
Electrical Characteristics Curve
Figure 1. Output Voltage vs. Input Voltage
Figure 2. Threshold Voltage vs. Input Voltage
Figure 3. Quiescent Current vs. Input Voltage
Figure 4. Output Current vs. Output Voltage
Figure 5. Output Voltage vs. Temperature
Figure 6. Load Transient Response
5/9
Version: E14
嵌入式系统
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
