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Data Sheet
PT7M8411
Dual LDO Regulator
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
Description
The PT7M8411 series are highly accurate, dual, low
noise, CMOS LDO voltage regulators. Performance
features of the series include low output noise, high
ripple rejection ratio, low dropout and very fast turn-on
times. The PT7M8411 includes a reference voltage
source, error amplifiers, driver transistors, current
limiters and phase compensators internally. The output
voltage for each regulator is set independently by
trimming. Voltages are selectable in 100mV steps within
a range of 1.2V to 3.3V includes 2.85V. The PT7M8411
series are also fully compatible with low ceramic
capacitors, reducing cost and improving output stability.
This high level of output stability is maintained even
during frequent load fluctuations, due to the excellent
transient response performance and high PSRR achieved
across a broad range of frequencies. The EN function
allows the output of each regulator to be turned off
independently, resulting in greatly reduced power
consumption.
Dual LDO Outputs (300mA/300mA)
Dropout Voltage：210mV@300mA
Operating Voltage Range：1.8V---5.5V
Output Voltage Range：1.2V---3.3V(100 mV Step)
Highly Accurate：±2%
Low Power Consumption：55µA/LDOs (TYP)
Standby Current：Less than 0.1µA (TYP)
High Ripple Rejection：75dB@1kHZ
Thermal Shutdown Protection
Current Limit Protection
Operating Temperature Range：-40℃~+85℃
Low ESR Capacitor compatible：Ceramic capacitor
Tiny TSOT-23-6L Package
Ordering Information
Part Number
PT7M8411①②③④TT6E
Package
Lead free and Green
TSOT23-6L
Applications
•
•
•
•
•
•
Note:
“
①②③④
” refer to different functions. See below
Table 1.
MP3/MP4/PMP
Mobile Phone
PHS RF and Baseband
DSC CMOS Sensor
GPS RF
WLAN
Table 1 Option Definition Table
Designator
Symbol
Description
Internally set sequential number relating output voltage of regulator1
①②
12-33, 2A
③④
12-33, 2A
Regulator 1 Output Voltage Range: 1.2V~ 3.3V, 2.85V the detail is in table2
Internally set sequential number relating output voltage of regulator2
Regulator 2 Output Voltage Range: 1.2V~ 3.3V, 2.85V the detail is in table2
PT0298 (05/11)
1
Ver: 1
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Data Sheet
PT7M8411
Dual LDO Regulator
Output Voltage (V)
2.3
2.4
2.5
2.6
2.7
2.8
2.9
3.0
3.1
3.2
3.3
Definition of designator
Designator
①②or ③④
12
13
14
15
16
17
18
19
20
21
22
2A
Output Voltage
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
2.0
2.1
2.2
2.85
Designator
①②or③④
23
24
25
26
27
28
29
30
31
32
33
Block Diagram
PT0298 (05/11)
2
Ver: 1
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Data Sheet
PT7M8411
Dual LDO Regulator
Pin Assignment
VOUT2
GND
EN2
1
2
3
TSOT23-6L
PT7M8411
6
5
4
VOUT1
VIN
EN1
Pin Description
Pin
1
2
3
4
5
6
I/O
O
P
I
I
I
O
Name
VOUT2
GND
EN2
EN1
VIN
VOUT1
Descriptions
Output of Regulator 2. Bypass with a 1µF ceramic capacitor (X5R/X7R) to GND.
Ground.
ON/OFF Control of Regulator 2.
ON/OFF Control of Regulator 1.
Regulators Supply Input. Supply voltage can range from 1.8V to 5.5V. Bypass with a 1µF ceramic
capacitor (X5R/X7R) to GND.
Output of Regulator 1. Bypass with a 1µF ceramic capacitor (X5R/X7R) to GND.
Functional Description
(Refer to Block Diagram)
Output voltage control
The P-Channel MOSFETs which are connected to the VOUT1 and VOUT2 pins, are then driven by the subsequent output signal.
The output voltages at the VOUT1 and VOUT2 pins are controlled and stabilized by a system of negative feedback. The current
limit circuit operates in relation to the level of output current. Further, the IC's internal circuitry can be shutdown via the EN1 and
EN2 pin's signal.
Low ESR Capacitors
With the PT7M8411 series, a stable output voltage is achievable even if used with low ESR capacitors as a phase compensation
circuit is built-in. In order to ensure the effectiveness of the phase compensation, we suggest that output capacitors are connected
as close as possible to the output pins (VOUT1 and VOUT2) and the GND pin. Please use an output capacitor with a capacitance
value of 1µF. Also, please connect an input capacitor of 1µF between the VIN pin and the GND pin in order to ensure a stable
power input.
Current Limiter
The PT7M8411 series includes a fixed current limiter circuit & a foldback circuit. When the load current reaches the current limit
level, the fixed current limiter circuit operates and output voltage drops.
Thermal Overload Protection
Thermal overload protection limits total power dissipation in the PT7M8411. When the junction temperature exceeds TJ =+170°C,
a thermal sensor turns off the pass transistor, allowing the device to cool. The thermal sensor turns the pass transistor on again
after the junction temperature cools by -40°C, resulting in a pulsed output during continuous thermal overload conditions.
Thermal overload protection protects the PT7M8411 in the event of fault conditions. For continuous operation, do not exceed the
absolute maximum junction-temperature rating of TJ=+125°
EN Pins
The IC's internal circuitry can be shutdown via the signal from the EN1 and EN2 pins with the PT7M8411 series. In shutdown
mode, output at the VOUT1 and VOUT2 pins will be pulled down to the GND level. For to protecting the system, the PT7M8411
have a quick-discharge function. The operational logic of the IC's EN1 and EN2 pins are selectable.
NOTE ON USE
Please use this IC within the stated absolute maximum ratings. The IC is liable to malfunction should the ratings be exceeded.
Where wiring impedance is high, operations may become unstable due to noise and/or phase lag depending on output current.
Please keep the resistance low between IN and GND wiring in particular. Please wire the input capacitor and the output capacitors
as close to the IC as possible.
PT0298 (05/11)
3
Ver: 1
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Data Sheet
PT7M8411
Dual LDO Regulator
Maximum Ratings
Storage Temperature………………………………………….. -55
℃
to +125
℃
Ambient Temperature with Power Applied......................-40℃ to +85℃
Input Voltage (V
IN
) …………………………………………………….…...6.5V
Output Current (I
OUT1
+I
OUT2
) ……………………………………………700mA
EN pin Voltage (V
EN
)…………………………….. ………….GND-0.5 to 6.5V
Power Dissipation…………………………………………………….450
*1
mW
Note:
*1 For TSOT23-6L package.
Note:
Stresses greater than those listed under MAXIMUM
RATINGS may cause permanent damage to the
device. This is a stress rating only and functional
operation of the device at these or any other condi-
tions above those indicated in the operational sec-
tions of this specification is not implied. Exposure
to absolute maximum rating conditions for extended
periods may affect reliability.
Typ.
-
25
Max.
5.5
85
Unit
V
°C
Recommended Operating Conditions
Symbol
V
CC
T
A
Parameter
Operating Voltage
Operating temperature
Min.
1.8
-40
Electrical Characteristics
(Regulator 1, Regulator 2 T
A
=25℃)
Parameter
Output Voltage
Maximum output current
Load Regulation
Dropout Voltage
Supply Current
Standby Current
Line Regulation
Input Voltage
Output Voltage
Temperature characteristics
Ripple Rejection Rate
Current Limiter
Thermal shutdown
Thermal Shutdown Hysteresis
EN”High”Voltage
EN”Low”Voltage
EN”High”Current
EN”Low” Current
Pull-down or Pull-up
Resistance for EN Pin
ON-resistance of Nch for fast
discharge
Symbol
V
OUT(E)
*2
I
OUTMAX
∆V
OUT
V
DIF*3
I
SS
I
STB
∆V
OUT
/
∆V
IN
*V
OUT
V
IN
∆V
OUT
/
∆Topr*V
OUT
PSRR
I
LIM
T
SD
△T
SD
V
ENH
V
ENL
I
IH
I
IL
R
PULL
R
DIS
CONDITIONS
V
IN
=V
OUT(S)
+1.0V
I
OUT
=30mA
V
IN
=V
OUT(T)
+1.0V
1.0 mA≤I
OUT
≤100
mA
1.7V≤V
OUT(S)
≤1.8V
1.9V≤V
OUT(S)
≤2.3V
I
OUT
=
300mA
2.4V≤V
OUT(S)
≤2.7V
2.8V≤V
OUT(S)
≤3.3V
V
IN
=V
OUT
+1.0V
No load
V
IN
=V
OUT(S)
+1.0V
V
EN
=GND
V
OUT(S)
+1V≤V
IN
≤5.5V,
I
OUT
=
30mA
-
I
OUT
=30 mA
-40℃≤T
A
≤85℃
I
OUT
=30 mA
f=1kHz
V
IN
=V
OUT(S)
+1.0V
V
EN
=V
IN
-
-
-
-
V
IN
=V
EN
=V
OUT
+1.0V
V
IN
=V
EN
=V
OUT
+1.0V,V
EN
= V
IN
-
shut down
Min.
*0.98
300
-
-
-
-
-
-
-
-
1.8
-
-
-
-
-
1.3
-
-0.10
-0.10
-
-
Typ.
V
OUT(S)*1
-
8
0.40
0.30
0.24
0.21
Max.
*1.02
-
20
0.80
0.60
0.48
0.42
Unit
V
mA
mV
V
µA
µA
%/V
V
ppm/
℃
dB
mA
℃
V
V
µA
µA
MΩ
kΩ
55
-
0.05
-
+100
75
500
170
30
-
-
-
-
5.0
1
-
1
0.20
5.5
-
-
-
-
-
6.5
0.3
0.10
0.10
-
-
Note:
*1: V
OUT(S)
=Specified output voltage.
*2: V
OUT(E)
=Effective output voltage.
(I.e. the output voltage when "V
OUT(S)
+1.0V" is provided at the VIN pin while maintaining a certain I
OUT
value).
*3: V
DIF
={V
IND(*5)
-V
OUTD1(*4)
}.
*4: V
OUTD
=A voltage equal to 98% of the output voltage whenever an amply stabilized I
OUT
{V
OUT(S)
+1.0V} is input.
*5: V
IND
=The input voltage when V
OUTD
appears as input voltage is gradually decreased.
*6: Unless otherwise stated, V
IN
=V
OUT(S)
+1.0V
PT0298 (05/11)
4
Ver: 1
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Data Sheet
PT7M8411
Dual LDO Regulator
Application Circuit
PT7M8411
Typical Performance Characteristics
1. Output Voltage vs. Output Current
PT7M8411 (1.8V)
Cin=1µF(Ceramics), Cout=1µF(Ceramics)
2.0
1.6
Vo (V)
1.2
0.8
0.4
0.0
0
100 200 300 400 500 600 700 800
Io (mA)
Vin=2.5V
Vin=3.5V
Vin=4.5V
Vin=5.5V
3.0
2.5
2.0
1.5
1.0
0.5
0.0
0
100
200
300
400
500
600
700
Io (mA)
Vin=3.5V
Vin=4.5V
Vin=5.5V
PT7M8411 (2.8V)
Cin=1µF(Ceramics), Cout=1µF(Ceramics)
PT0298 (05/11)
5
Vo (V)
Ver: 1
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