TS9007
300mA Ultra-Low-Noise, High PSRR LDO Regulator
Pin assignment
1. Input
2. Ground
3. Enable
4. Bypass
5. Output
Low Drop Out Voltage 0.45V
Low Quiescent Current
High PSRR
General Description
The TS9007 series is 300mA ultra-low-noise LDO especially designed for battery-power RF and wireless applications.
The TS9007 regulator achieves a low 450mV dropout at 300mA load current of 3.3V output, ultra-low output voltage
noise of 15uVrms and PSRR of 57dB at 1KHz.
The TS9007 regulators are also optimized to work with low-ESR and low cost ceramic capacitors reducing the amount
of board space critical in hand-held devices. The TS9007 requires only 0.47uF output capacitor for stability with and
load. The TS9007 consumes less than 1uA in shutdown mode. Available in SOT-25 package.
Features
450mV Dropout at 300mA load (3.3V)
Ultra low noise
Output current up to 300mA
Low quiescent current: 90µA
Output voltage +/-2%
Internal current limit and thermal shutdown
Power saving shutdown mode (<1uA)
Only need input and output capacitors
Build-In internal Soft-Start
Output short-circuit current limit protection
Stable with 0.47uF ceramic capacitor for load
Green package (RoHS) available
Ordering Information
Part No.
TS9007
x
CX5
Operating Temp.
(Ambient)
-40 ~ +85
o
C
Package
SOT-25
Note: Where
x
denotes voltage option, available are
D=
1.8V
K=
2.5V
N=
2.8V
O=
2.9V
P=
3.0V
R=
3.2V
S=
3.3V
Contact factory for additional voltage options
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
Wireless LANs
Bluetooth Portable Radios
Block Diagram
Typical Application Circuit
TS9007 series
1-5
2006/02 rev. C
Absolute Maximum Rating
Supply Voltage
Input Supply Voltage (Recommended)
Output Short-Circuit Duration
Power Dissipation
Thermal Resistance
Junction Temperature Range
Storage Temperature Range
Lead Soldering Temperature (260
o
C)
Pd
Өja
Tj
Tstg
Vin
Vopr
-0.3 ~ +7
+2 ~ +6
Infinite
380
260
+150
-65 ~ +150
5
mW
o
V
V
C/W
o
o
C
C
S
Caution:
Stress above the listed absolute rating may cause permanent damage to the device
.
Electrical Characteristics
Ta = 25
o
C, Vin= (V
OUT
+1V), Cin=Cout=0.47uF, Ven=Vin, unless otherwise specified.
Parameter
Output Voltage
Output Current Limit
Maximum Output Current
Line Regulation
Load Regulation
Conditions
Vin =Vo + 1V, I
O
=10mA
Short-circuit output
Vin =Vo+1V,
Vin=(V
OUT
+1V) to 6V, I
O
=10mA
Vin=Vo+1V,
1mA≤I
L
≤300mA
Vin=Vo+1V,
1mA≤I
L
≤200mA
Vout<2.5V
Vout
≥
2.5V
Vout<2.5V
Vout
≥
2.5V
Min
-2.0
--
300
--
--
--
--
--
--
--
--
--
--
--
--
--
--
1.5
--
--
Typ
--
200
--
0.3
0.2
0.2
500
800
0.01
90
55
75
55
45
15
45
--
--
--
160
Max
+2
--
--
--
1.0
Unit
%
mA
mA
%/V
%
1.0
600
1000
--
150
--
--
--
--
--
300
0.4
VIN
--
--
uVrms
dB
uA
uA
mV
Dropout Voltage
Io=300mA,
Vout=Vo - 2%
Io=200mA,
Vout=Vo - 2%
Shutdown Supply Current
Ground Pin Current
Ripple Rejection (PSRR)
EN=0V
Io=0mA
f=100Hz, Io=1mA
f=1KHz, Io=1mA
f=10kHz, Io=1mA
Io=10mA, f=10Hz to 100kHz,
Bypass = 0nF
Io=10mA, f=10Hz to 100kHz,
Bypass = 30nF
R
LOAD
= 50Ω
Vin=2.0V to 5.5V
Vin=2.0V to 5.5V
Vin=2.0V to 5.5V
Shutdown Temperature
Output Noise
Shutdown Exit Delay (note 2)
EN Logic Low Level
EN Logic High Level
EN Input Bias Current
Thermal Shutdown
uS
V
uA
o
o
C
C
Thermal Shutdown Hysteresis
--
20
--
Note 1: The drop out voltage varies depending on output voltage selection
Dropout is defined as Vin - Vout when Vout is 100mV below Vout where Vin = Vout+1V for nominal Vout
Note 2: Time needed for Vout to reach 90% of final value
TS9007 series
2-5
2006/02 rev. C
Functional Description
Description
The TS9007 is an ultra-low-noise, low-quiescent current, low-dropout linear regulator. It is supplied in a SOT-25
package for difference applications. This device can supply loads up to 300mA. As shown in the functional block
diagram, the TS9007 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 internal reference is connected to the
error amplifier’s inverting input. The error amplifier compares this reference with the feedback voltage and amplifies
the difference. If the feedback voltage is lower than the reference voltage, the pass=transistor gate is pulled low. This
allows more current to pass to the output and increases the output voltage.
Stability
The TS9007 is a high performance LDO emphasizing stability with low output capacitance. It is able to maintain
stability with an output capacitor can also be increased to optimize performance. The TS9007 will remain stable and
in regulation with no load, unlike many other voltage regulators.
Internal P-Channel Pass Transistor
The TS9007 features alow 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 TS9007
consumes only 90µA of quiescent current under most conditions.
Output Short-Circuit Current Limit
The TS9007 includes a current limiter, which monitors and controls the pass transistor’s gage voltage, limiting the
output current to about 200mA, for example, in a short-circuit output situation.
Shutdown
The TS9007 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
o
junction temperature exceeds +160 C, the thermal sensor signals the shutdown logic, turning off the pass transistor
and allowing the IC to tool down. The thermal sensor turns the pass transistor on again after the IC’s junction
o
temperature drops to +140 C.
Soft-Start Circuitry
The TS9007 includes a soft-start circuitry to limit inrush current at turn-on. During power up, the output capacitor and
output load are charged with a reduce output current. Shortly after the initial power up, the soft-start feature is
terminated and normal operation is resumed.
Application Information
Enable / Shutdown
The TS9007 comes with and 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.
Input / Output Capacitor
It is recommended to use a 0.47uF capacitor on the TS9007 input and a 0.47uF capacitor on 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.
Power Supply Rejection and Transient Response
The PSRR and transient response can be improved by increasing the values of the input and output bypass
capacitors, and through passive filtering techniques
TS9007 series
3-5
2006/02 rev. C
Embedded System
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