150mA CMOS Low Dropout Regulator With Power OK
Copyright
ANPEC Electronics Corp.
Rev. A.4 - Aug., 2003
APL5158
www.anpec.com.tw
1
ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and advise
customers to obtain the latest version of relevant information to verify before placing orders.
P a c k a g e C o d e
B : S O T - 2 3 - 5
T e m p . R a n g e
C : 0 t o 7 0 C
H a n d lin g C o d e
T R : T a p e & R e e l
V o lt a g e C o d e :
1 2 : 1 . 2 V
L e a d F r e e C o d e
L : L e a d F r e e D e v ic e
B la n k : O r g i n a l D e v ic e
A P L 5 1 5 8 -
H a n d lin g C o d e
T e m p . R a n g e
P a c k a g e C o d e
V o lt a g e C o d e
5 - 1 . 2 V
X - D a t e C o d e
1 8 5 X
L e a d F r e e C o d e
Features
General Description
The APL5158 is a precise CMOS LDO with power ok
function. The APL5158 offers 2% output accuracy
over temp, and an ultra low ground current 60
µ
A.
The power good 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
over current, thermal shutdown, the power ok output
is pulled low.
The APL5158 also works with low-ESR
output capacitors, reducing the amount of board space
for power applications, critical in hand-held wireless
devices. Key features include current-limit, thermal
shutdown, fast transient response. A compact pack-
age SOT-23-5 is available for space saving purpose.
Applications
•
Processor power up sequencing
•
Laptop,notebook, and palmtop computers
•
Wireless LAN
•••••
Ultra low ground current : 60
µ
A
•••••
Low Dropout Voltage Regulator, 1.5V
•••••
150mA Load Current Capability
•••••
Output Voltage Accuracy : ±2% Over Temp.
•••••
Input Voltage Range of 2.7V to 6.0V
•••••
Power Good (POK) Function
•••••
Current Limit Protection
•••••
Thermal Shutdown Protection
•••••
Fast Transient Response
•••••
Stability with low-ESR capacitors
•••••
TTL Logic controlled enable input
•••••
SOT-23-5 Package
Pin Configuration
V
IN
G N D
P O K
V
O U T
1
2
3
5
E N
4
SOT-23-5
Ordering and Marking Information
°
Copyright
ANPEC Electronics Corp.
Rev. A.4 - Aug., 2003
APL5158
www.anpec.com.tw
2
Pin Description
PIN
No.
Name
I/O
Description
1
V
IN
I
Input supply voltage.
2
GND
Ground pin for signal ground and power ground.
3
EN
I
Enable/shutdown input (active high). Do not leave open.
4
POK
O
Power OK indicator.
5
V
OUT
O
Regulator output voltage.
Symbol
Parameter
Rating
Unit
V
IN
Input Voltage
7
V
V
EN
Enable Input Voltage
7
V
P
D
Power Dissipation
Internally Limited
W
T
J
Junction Temperature
150
°
C
T
STG
Storage Temperature
-65 to +150
°
C
T
S
Soldering Temperature (10 seconds)
300
°
C
ESD
ESD Classification
2
kV
Absolute Maximum Ratings
Block Diagram
POK
Shutdown
Control
EN
Voltage
Reference
Voltage
Supervisor
2.5ms Delay
Power Okay
Control
Thermal
Protection
Current Sense
V
IN
GND
V
OUT
Copyright
ANPEC Electronics Corp.
Rev. A.4 - Aug., 2003
APL5158
www.anpec.com.tw
3
Electrical Characteristics
T
A
=25
°
C, V
I
=5V, V
(EN)
=V
I
, I
O
=100
µ
A, C
L
=1
µ
F, unless otherwise specified.
Thermal Characteristics
Symbol
Parameter
Rating
Unit
θ
JA
Thermal Resistance in Free Air
SOT-23-5
357
°C/W
APL5158
Symbol
Parameter
Test Conditions
Min. Typ. Max.
Unit
V
IN
Input Voltage
2.7
6
V
Output Voltage
I
O
=25mA
1.2
V
I
O
=0mA
-1.0
+1.0
%
V
OUT
Output Voltage Accuracy
I
O
=1~150mA,T
A
=0°C to 70°C
-2.0
+2.0
%
I
Q
Quiescent Current
V
(EN)
Ø0.8V
0.45 1
µ
A
I
O
=0mA
60
µ
A
I
GND
Ground Terminal Current
I
O
=150mA
370
µ
A
I
L
Output Load Current
150
mA
I
LIMIT
Output Current Limit
300 600
mA
µV
LNR
Line Regulation
V
IN
=2.7V to 6V
-0.1
+0.1
%
µV
LDR
Load Regulation
I
O
=10mA to 150mA
0.2
1
%
I
O
=100
µ
A
1.5
V
V
IN
-V
OUT
Dropout Voltage
I
O
=150mA
1.5
V
C
L
Load Capacitance
ESR and Capacitance Tradeoffs
1
µ
F
I
REV
Reverse Output Current on
V
IN
V
IN
=GND, V
OUT
= Regulated Voltage
4
mA
Enable Input
V
IL
Enable Input Logic-Low
Voltage
V
IN
=2.7V to 6V Regulated Shutdown
0.4
V
V
IH
Enable Input Logic-High
Voltage
V
IN
=2.7V to 6V Regulated Enabled
1.6
V
Shutdown, V
IL
Ø0.8V
0.01
µ
A
I
EN
Enable Input Current
Enabled, V
IH
Ù2V
0.01
µ
A
Resistance Discharge
V
EN
Ø0.8V
500
Ω
Thermal Protection
T
SD
Thermal Shutdown
150
°C
T
SDHYS
Hysteresis
15
°C
Power Good
Low Threshold
Output Falls % of V
OUT
(Power not OK)
83
%
V
POK
High Threshold
Output Reaches % of V
O
,Starts Delay
Timer(Power OK)
90
%
V
OL
V
O
Out of Regulation
Fault Condition,I
OL
=2mA,V
IN
=3.3V
0.13 0.15
V
I
POK
POK Leakage Current
Power good off,V
IN
=5V
1
µ
A
Switching Characteristics
Power Up Overshoot
Max Voltage Overshoot Allowed on
Output During Power Up
1
%
t
STEP
Output Transient Time Limit Time for Output to Return within
Specified Regulation Range
5
µ
s
Output Transient Voltage
Limit
Voltage that Load Step can Affect the
Nominal Output Voltage
1
%
Copyright
ANPEC Electronics Corp.
Rev. A.4 - Aug., 2003
APL5158
www.anpec.com.tw
4
APL5158
Symbol
Parameter
Test Conditions
Min. Typ. Max.
Unit
I
SR
Load Step Current Slew
Rate
I
L
=10mA to 150mA
10
mA/
µ
s
tr
Power Up Rise Time
3
ms
tf
Power Down Fall Time
Discharge resistance=500
Ω,
V
O
<1.08V
60
µ
s
V
POK
Delay Delay Time to Power Good
1
2.5
5
ms
Application Circuit
Electrical Characteristics Cont.
T
A
=25
°
C, V
I
=5V, V
(EN)
=V
I
, I
O
=100
µ
A, C
L
=1
µ
F, unless otherwise specified.
Note 1 : Positive output current means the regulator is sourcing load current, and negative one is sinking
load current.
Typical Application For Processor VID Code Power Sequencing Schematic
V
IN
=3 to 6V
1
µ
F
V
OUT
=1.2V
10K
Ω
EN
POK
GND
V
IN
1
µ
F
V
OUT
1
2
3
4
5
APL5158
Copyright
ANPEC Electronics Corp.
Rev. A.4 - Aug., 2003
APL5158
www.anpec.com.tw
5
Timing Chart
POK Delay 2.5 ms typ.
90% max
83% min
2.5ms
2.5ms
Fault Condition
EN
V
I
V
O
POK
Copyright
ANPEC Electronics Corp.
Rev. A.4 - Aug., 2003
APL5158
www.anpec.com.tw
6
!
"
#
!
"
#
$
0
4
8
12
16
20
0
0.5
1
1.5
2
2.5
3
3.5
#
#
#
!
!#
"
#
#
%#
#
#
0
100
200
300
400
500
600
700
3
3.5
4
4.5
5
5.5
6
Typical Characteristics
Current Limit vs. lnput Voltage
Current
Limit
(mA)
Input Voltage (V)
Ground Pin Current vs. Output Current
Output Current (mA)
Ground Pin Current (uA)
POK Delay Time vs. Input Voltage
Input Voltage (V)
POK
Delay
Time
(ms)
POK Sink Current vs. POK Low Voltage
POK Low Voltage (V)
POK
Sink
Current
(mA)
V
IN
= 5V
I
OL
= 100uA
V
IN
= 3.3 V
POK is connected to V
IN
Copyright
ANPEC Electronics Corp.
Rev. A.4 - Aug., 2003
APL5158
www.anpec.com.tw
7
#
#
!
"
#
$
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
2
3
4
5
6
Typical Characteristics
EN Threshold Voltage vs. lnput Voltage
lnput Voltage (V)
EN
Threshold
Voltage
(V)
Time (20us/div)
Time (20us / div)
Line Transient Response
High Thershold
Low Thershold
V
IN
= 3.3V
V
OUT
(10mV/div)
I
OUT
= 0.1mA to 150mA
(10mA /
µ
s)
V
IN
= 3V to 4V
V
OUT
(20 mV/div)
Load Transient Response
I
OUT
=0mA
Ground Pin Current vs. Input Voltage
Ground Pin Current (uA)
Input Voltage (V)
Copyright
ANPEC Electronics Corp.
Rev. A.4 - Aug., 2003
APL5158
www.anpec.com.tw
8
0.001
0.01
0.1
1
10
0
50
100
150
Typical Characteristics
Region of Stable C
OUT
ESR vs. Output Current
C
OUT
ESR(
Ω
)
Power Up
Time (2ms/div)
Time (2ms/div)
Output Current (mA)
V
OUT
= 1.2V
C
OUT
= 1uF
Stable Region
Untested Region
V
IN
(2V/div)
V
OUT
(0.5V/div)
POK(0.5V/div)
V
OUT
(0.5V/div)
POK(0.5V/div)
EN
(2V/div)
Exiting Shutdown
Time (50ms/div)
Power Down
V
IN
(2V/div)
POK(0.5V/div)
V
OUT
(0.5V/div)
Copyright
ANPEC Electronics Corp.
Rev. A.4 - Aug., 2003
APL5158
www.anpec.com.tw
9
1.188
1.190
1.192
1.194
1.196
1.198
1.200
1.202
-40 -20
0
20 40 60 80 100 120
30
40
50
60
70
80
90
-40 -20
0
20
40
60
80 100 120
2.8
3
3.2
3.4
3.6
3.8
4
-40
-20
0
20
40
60
80
100
Typical Characteristics
Temperature (°C)
POK
Delay
Time
(ms)
V
IN
=3.3V
Temperature (°C)
Output
Voltage
(V)
V
IN
=3.3V
Temperature (°C)
Q
uiescent
Current
(uA)
V
IN
=5V
V
IN
=3.3V
POK Delay Time vs. Temperature
Output Voltage vs. Temperature
Quiescent Current vs. Temperature
I
OUT
=0mA
Copyright
ANPEC Electronics Corp.
Rev. A.4 - Aug., 2003
APL5158
www.anpec.com.tw
10
Application Information
Capacitor Selection and Regulator
Stability
The APL5158 use at least a 1uF capacitor on the
input. This capacitor can use Aluminum, Tantalum or
Ceramic capacitors. Input capacitor with large value
and low ESR provides better PSRR and line-transient
response. The output capacitor also can use
Aluminum, Tantalum or Ceramic capacitors, and its
minimum values is recommended 1uF, ESR muse be
above 0.01
Ω
. The Curve of the region of stable C
OUT
ESR vs. load current in Typical Characteristics shows
the output capacitor ESR and load current range for
APL5158 stability. Large output capacitor values can
reduce noise and improve load-transient response,
stability, and PSRR. Note that some ceramic dielec-
trics exhibit large capacitance and ESR variation with
Temperature. If use this capacitor, it may be neces-
sary to use 2.2uF or more to ensure stability at tem-
perature below -10
°
C.
Load-Transient Considerations
The APL5158 Load-transient response graphs in Typi-
cal Characteristics show the transient response. A
step change in the load current from 0.1mA to 150mA
at 15u second will cause less than 10mV transient
spike. Large output capacitors value and low ESR
can reduce transient spike.
Shutdown/Enable
The APL5158 has an active high enable function.
Force EN high (>1.6V) enables the regulator, EN low
(<0.4V) disables the regulator and enter the shut-
down mode, it also causes the output voltage to dis-
charge through a 500
Ω
resistance to ground. In shut-
down mode, the quiescent current can reduce below
1uA. The EN pin cannot be floating, a floating EN pin
may cause an indeterminate state on the output. If it
is no use, connect to V
IN
for normal operation.
Power Ok
The power ok function monitors the output voltage
and drives high or low to indicate a fault. When a
fault condition such as overcurrent, undervoltage, ther-
mal shutdown., or dropout occurs, the power ok out-
put is pulled low. The power ok output comes back
when the output voltage has reached 90% of its nomi-
nal value and with a typ. 2.5ms delay time. The power
ok is an open-drain output, connect a 10k
Ω
resis-
tance to V
OUT
for typical application
Input-Output (Dropout)Voltage
The minimun input-output voltage differential (dropout)
determines the lowest usable supply voltage. The mini-
mum input voltage is 2.7V and output voltage is 1.2V,
so the dropout voltage is 1.5V.
Reverse Protection
The APL5158 has a internal reverse protection, it
doesnt need a external schottky diode to connect the
regulator input and output. If the output voltage is
forced above the input voltage, the IC will be shut-
down and the reverse output current is below 4mA , it
will increase with the output voltage. The maximum
allowable output voltage is 7V (see Absolute Maxi-
mum Rantings).
Current Limit
The APL5158 has a current limit protection, which
senses the current flows the P-channel MOSFET, and
controls the output voltage. The point where limiting
occurs is I
OUT
=600mA and the output voltage will be
shutdown. The output can be shorted to ground for
an indefinite amount of time without damaging the
part.
Copyright
ANPEC Electronics Corp.
Rev. A.4 - Aug., 2003
APL5158
www.anpec.com.tw
11
Application Information
Thermal Protection
Thermal protection limits total power dissipation in the
APL5158. When the junction temperature exceeds
T
J
=+150
°
C, the thermal sensor generate a logic sig-
nal to turn off the pass transistor and let IC to cool.
When the ICs junction temperature cools by 15
°
C,
the thermal sensor will turn the pass transistor on
again, resulting in a pulsed output during continuous
thermal protection. Thermal protection is designed to
protect the IC in the event of fault conditions. For
continual operation, do not exceed the absolute maxi-
mum junction temperature rating of T
J
=+150
°
C.
Operating Region and Power Dissi-
pation
The thermal resistance of the case and circuit board,
ambient and junction air temperature, and the rate of
air flow all control the APL5158s maximum power
dissipation. The power dissipation across the device
is P = I
OUT
(V
IN
-V
OUT
). The maximum power dissipa-
tion is:
P
MAX
= (T
J
-T
A
) / (
θ
JB
+
θ
BA
)
where T
J
-T
A
is the temperature difference between
the junction and ambient air.
θ
JB
(or
θ
JB
) is the thermal
resistance of the package,
θ
BA
is the thermal resis-
tance through the printed circuit board, copper
traces, and other materials to the surrounding air.
The GND pin of the APL5158 provide an electrical
connection to ground and channeling heat away.
Connect the GND pin to ground using a large pad or
ground plane as a heatsink, it can improve maximize
thermal dissipation.
Copyright
ANPEC Electronics Corp.
Rev. A.4 - Aug., 2003
APL5158
www.anpec.com.tw
12
Packaging Information
SOT-23-5
e1
E1
E
b
1
2
3
4
5
e
D
A2
A
A1
L 2
L
L 1
a
Millimeters
Inches
Dim
Min.
Max.
Min.
Max.
A
0.95
1.45
0.037
0.057
A1
0.05
0.15
0.002
0.006
A2
0.90
1.30
0.035
0.051
D
2.8
3.00
0.110
0.118
E