TI SN105125

SN105125
150-mA LOW DROPOUT REGULATOR WITH POK
SLVS418 – JANUARY 2002
DBV PACKAGE
(TOP VIEW)
features
D
D
D
D
D
D
D
D
D
D
D
Low Dropout Voltage Regulator, 1.2-V
150-mA Load Current Capability
Power Okay (POK) Function
Load Independent, Low Ground
Current,150-µA
Current Limiting
Thermal Shutdown
Low Sleep State Current (Off Mode)
Fast Transient Response
Low Variation Due to Load and Line
Regulation
Output Stable With Low ESR Capacitors
TTL Logic Controlled Enable Input
VI
1
GND
2
EN
3
5
VO
4
POK
applications
D Processor Powerup Sequencing
D Palmtop Computers, Laptops, and
Notebooks
description
The SN105125 is a low dropout voltage regulator with an output tolerance of ±2% over the operating range. The
device is optimized for low noise applications and has a low quiescent current (enable <0.8 V). The device has
a low dropout voltage at full load (150 mA). The power okay function monitors the output voltage and indicates
when an error occurs in the system (active low). In the event of an output fault such as overcurrent, thermal
shutdown, or dropout, the power okay output is pulled low (open drain).
The SN105125 has a fast transient response recovery capability in the event of load transition from heavy load
to light load. The device also minimizes overshoot during this condition. During power down, the output
capacitor and load are de-energized through the internal active shutdown clamp, which is turned on when the
device is disabled.
The SN105125 requires a small output capacitor for stability with low ESR. An input capacitor is not required
unless the bulk ac capacitor is placed away from the device or the power supply is a battery. In this situation,
a 1-µF capacitor is recommended for the application. Low ESR ceramic capacitors may be used with the device
to reduce board space in power applications, a key concern in hand-held wireless devices.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Copyright  2002, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
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1
SN105125
150-mA LOW DROPOUT REGULATOR WITH POK
SLVS418 – JANUARY 2002
functional block diagram
VI
EN
Voltage
Reference
Enable/Disable
Control
Fault
Gate Drive Control
and
Current Amplifier
Error
Amplifier
Thermal
Sensor
VO
Active
Shutdown
Undervoltage
Lockout
Voltage Supervisor
With
Delay Timer
POK
Fault
Overcurrent
Detection and
Dropout Voltage
Detection
Power Okay
Control
GND
Terminal Functions
TERMINAL
NAME
NO.
I/O
DESCRIPTION
EN
3
I
Enable/shutdown input (active high)
GND
2
I
Ground
POK
4
I
Power okay indicator
VI
VO
1
I
Input supply voltage
5
O
Output voltage
2
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• DALLAS, TEXAS 75265
SN105125
150-mA LOW DROPOUT REGULATOR WITH POK
SLVS418 – JANUARY 2002
absolute maximum ratings over operating free-air temperature (unless otherwise noted)†
Main input voltage range, VI (see Notes 1 and 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V to 7 V
Enable input voltage range, V(EN) (see Notes 1 and 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V – VI
Power okay output voltage range V(POK), (see Notes 1 and 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V – VI
Regulated output current limit, IO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400 mA
Continuous power dissipation, PD, TA = 25°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 W
Electrostatic discharge susceptibility, V(HBMESD), (see Note 3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 kV
Junction temperature, TJ, . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150°C
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –55°C to 150°C
Lead temperature (soldering, 10 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°C
† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES: 1. All voltage values are with respect to GND.
2. Absolute negative voltage on these terminals should not go below –0.5 V.
3. The human body model is a 100-pF capacitor discharged through a 1.5-kΩ resistor into each terminal. Devices are ESD sensitive.
Handling precautions are recommended.
recommended operating conditions
MIN
TYP
MAX
UNIT
Main input voltage, VI (see Notes 1 and 2)
3
5.25
V
Enable input voltage, V(EN) (see Notes 1 and 2)
0
V
Power okay voltage, V(POK) (see Notes 1 and 2)
0
VI
VI
0
70
°C
Operating ambient temperature, TA
NOTES: 1. All voltage values are with respect to GND.
2. Absolute negative voltage on these terminals should not go below –0.5 V.
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V
3
SN105125
150-mA LOW DROPOUT REGULATOR WITH POK
SLVS418 – JANUARY 2002
electrical characteristics, TA= 25°C, VI =5 V, V(EN) = VI, IO = 100 µA, CL = 1 µF(unless otherwise noted)
regulator VO
PARAMETER
TEST CONDITIONS
Output voltage
VO
IO = 25 mA
IO = 0
Output voltage accuracy
Quiescent supply current
I(GND)
Ground terminal current (see Note 5)
IL
I(Limit)
Output load current
∆V(LNR)
∆V(LDR)
Line regulation
CL
Load capacitance
I(REV)
NOTES: 4.
5.
6.
–1%
V
2%
µA
1
150
µA
A
150
160
IO = 0.1 mA to150 mA, See Note 6
IO = 100 µA
UNITS
1%
–2%
IO = 0
IO = 150 mA
VO = 0
VI = 3 V to 5.25 V
Load regulation
Dropout voltage
MAX
150
Output current limit
VI – VO
TYP
1.2
IO = 50 mA, TA = 0°C to 70°C (see Note 4)
V(EN) ≤ 0.8 V
IQ
MIN
mA
300
mA
10
mV
2%
3%
1
IO = 150 mA
ESR and capacitance tradeoffs
V
1
µF
1
VI = GND, VO = regulated voltage
50
µA
Assured by design, not tested in production.
Ground terminal current is the regulator quiescent current drawn from the supply to support the load current.
Regulation is measured at constant junction temperature using low duty cycle pulse testing. Devices are tested for load regulation
in the load range from 0.1 mA to 150 mA.
Reverse output current on VI
enable input
PARAMETER
VIL
VIH
I(EN)
TEST CONDITIONS
Regulated shutdown
VI = 3 V to 5.25 V regulated shutdown
VI = 3 V to 5.25 V regulated enabled
Regulated enabled
Enable input current
Resistance discharge
MIN
TYP
MAX
0.8
2
UNITS
V
V
Shutdown, VIL ≤ 0.8 V
0.01
Enabled, VIH ≥ 2 V
0.01
V(EN) ≤ 0.8 V
500
µA
A
Ω
thermal protection (see Note 4)
PARAMETER
T(SD)
T(SDHYS)
TEST CONDITIONS
MIN
Thermal shutdown
Hysteresis
TYP
MAX
UNITS
165
°C
15
°C
NOTE 4: Assured by design, not tested in production.
power okay (see Note 7)
PARAMETER
TEST CONDITIONS
V(POKLO)
V(POKTH)
Low threshold
Output falls % of VO (power NOT okay)
High threshold
Output reaches % of VO, starts delay timer (power okay)
VOL
Ilkg
VO out of regulation
Leakage current
Fault condition, IOL = 100 µA
MIN
TYP
MAX
UNITS
85%
90%
0.4
V
VI = 5 V
1
µA
NOTE 7: Power okay is a function of the output voltage being 5% lower than the specified range. The function is a detection of one of the following:
over current, over temperature, or dropout.
4
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• DALLAS, TEXAS 75265
SN105125
150-mA LOW DROPOUT REGULATOR WITH POK
SLVS418 – JANUARY 2002
switching characteristics (see Note 4),TA = 25°C, VI = 5 V, V(EN) = VI, IO = 100 µA, CL = 1 µF(unless
otherwise noted)
PARAMETER
t(STEP)
TEST CONDITIONS
Power up overshoot
Maximum voltage overshoot allowed on output during
powerup
Output transient time limit
Time for output to return within specified regulation range
Output transient voltage limit
Voltage that load step can affect the nominal output voltage
I(SR)
tr
Load step current slew rate
IL = 0.1 mA to 150 mA
tf
td(POK)
Power down fall time
MIN
TYP
MAX
UNIT
1%
µs
5
1%
Power up rise time
Discharge resistance = 500 Ω, VO < 1.08 V
Power okay delay time
VI > V(POKTH) until POK↑
NOTE 4: Assured by design, not tested in production.
10
mA/µs
50
µs
60
µs
2.5
ms
thermal resistance
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
RθJC
Thermal impedance, junction-to-case
145
°C/W
RθJA
Thermal impedance, junction-to-ambient
235
°C/W
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5
SN105125
150-mA LOW DROPOUT REGULATOR WITH POK
SLVS418 – JANUARY 2002
PARAMETER MEASUREMENT INFORMATION
V(POKTH)
90%
td(POK)
VO
POK
Figure 1. Power Okay Timing During Power Up
EN
VI
85% min
90% max
VO
POK Delay 2.5 ms typ
POK
Figure 2. Power Okay Delay Timing and Output Voltage Supervisory
6
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• DALLAS, TEXAS 75265
SN105125
150-mA LOW DROPOUT REGULATOR WITH POK
SLVS418 – JANUARY 2002
TYPICAL CHARACTERISTICS
VO
IL
Figure 3. Load Regulation, 50-mA Dynamic Load Step (VI = 3 V)
VO
IL
Figure 4. Load Regulation, 150-mA Dynamic Load Step (VI = 3 V)
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SN105125
150-mA LOW DROPOUT REGULATOR WITH POK
SLVS418 – JANUARY 2002
TYPICAL CHARACTERISTICS
VO
IL
Figure 5. Load Regulation, 50-mA Dynamic Load Step (VI = 5 V)
VO
IL
Figure 6. Load Regulation, 150-mA Dynamic Load Step (VI = 5 V)
8
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
SN105125
150-mA LOW DROPOUT REGULATOR WITH POK
SLVS418 – JANUARY 2002
TYPICAL CHARACTERISTICS
VO
POK
EN
Figure 7. Power Okay Delay During Power Up Condition
VO
POK
Figure 8. Power Okay Delay During Power Down Condition
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• DALLAS, TEXAS 75265
9
SN105125
150-mA LOW DROPOUT REGULATOR WITH POK
SLVS418 – JANUARY 2002
THERMAL INFORMATION
The SN105125 is designed to provide a continuous load current of 150 mA when the maximum power
dissipation of the package is not exceeded in the application. To determine the maximum power dissipation of
the package, use the junction-to-ambient thermal resistance of the device. The basic equation is as follows:
Maximum power dissipation (W)
PD(MAX) = (TJ(MAX) – TA) / RθJA (maximum power dissipation limit)
Where:
TJ(MAX) is the maximum junction temperature of the die (less than 150°C, minimum thermal shutdown)
TA is the operating ambient temperature
RθJA is the thermal resistance and is layout dependent
The recommended minimum footprint offers a RθJA of 235°C/W.
To determine the actual power dissipation of the regulator, use the following equation:
PD = (VI – VO) IO + VI I(GND) (Watts)
Power dissipation resulting from quiescent current is negligible. When the power dissipation is excessive, the
thermal protection circuit is triggered.
10
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
SN105125
150-mA LOW DROPOUT REGULATOR WITH POK
SLVS418 – JANUARY 2002
APPLICATION INFORMATION
47 kΩ
1
VO 5
VI
SN105125
2
GND
Optional: EN May
Be Connected to VI
Enable
3
EN
POK
1.2 V
1 µF
4
Shutdown
Figure 9. Typical Application Schematic
VCC3_3
VCC1_2
1
VO 5
VI
SN105125
2
GND
3
EN
POK
10 kΩ
4
1 µF
1 µF
Figure 10. Typical Application For Processor VID Code Power Sequencing Schematic
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11
SN105125
150-mA LOW DROPOUT REGULATOR WITH POK
SLVS418 – JANUARY 2002
MECHANICAL DATA
DBV (R-PDSO-G5)
PLASTIC SMALL-OUTLINE
0,50
0,30
0,95
5
0,20 M
4
1,70
1,50
1
0,15 NOM
3,00
2,60
3
Gage Plane
3,00
2,80
0,25
0°–8°
0,55
0,35
Seating Plane
1,45
0,95
0,05 MIN
0,10
4073253-4/F 10/00
NOTES: A.
B.
C.
D.
12
All linear dimensions are in millimeters.
This drawing is subject to change without notice.
Body dimensions do not include mold flash or protrusion.
Falls within JEDEC MO-178
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Copyright  2002, Texas Instruments Incorporated