Power APE8981 3a ultra low dropout linear regulator Datasheet

Advanced Power
Electronics Corp.
APE8981
3A ULTRA LOW DROPOUT LINEAR REGULATOR
FEATURES
DESCRIPTION
Ultra Low Dropout 0.21V(typical) @ 2A Output
Current for 1.2V Output Voltage
Low ESR Output Capacitor (Multi-layer Chip
Capacitors (MLCC)) Applicable
EN Pull-low for APE8981MP-A
EN Pull-high for APE8981MP-B
Fast Transient Response
Adjustable Output Voltage by External Resistors
Power-On-Reset Monitoring on Both VCNTL
and VIN Pins
Internal Soft-Start
Current-Limit and Thermal Shutdown Protection
Power-OK Output with a Delay Time
SO-8 with Exposed Pad Pb-Free &
DFN 3x3-10L Package.
Halogen Free Product
The APE8981 series is a 3A ultra low dropout linear
regulator. This product is specifically designed to provide
well supply voltage for front-side-bus termination on
motherboards and NB applications. The IC needs two
supply voltages, a control voltage for the circuitry and a
main supply voltage for power conversion, to reduce power
dissipation and provide extremely low dropout. The
APE8981 series integrates many functions. A Power-OnReset (POR) circuit monitors both supply voltages to
prevent wrong operations. A thermal shutdown and current
limit functions protect the device against thermal and
current over-loads. A POK indicates the output status with
time delay which is set internally. It can control other
converter for power sequence.
The APE8981 series can be enabled by other power
system. Pulling and holding the EN pin below 0.4V shuts off
the output.
The APE8981 series is available in DFN 3x3-10L &
ESOP-8 package which features small size as SO-8 and an
Exposed Pad to reduce the junction-to-case resistance.
TYPICAL APPLICATION
POK
R3
U1
POK
GND
10k
EN
VIN
VCNTL
EN
FB
VIN
VOUT
VCNTL
C1
4 .7 uF
C2
1 uF
Data and specifications subject to change without notice
NC
VOUT
R1
20k
CF
*option
Cout
10uF
APE8981
R2
10k
1
201301046
Advanced Power
Electronics Corp.
APE8981
PACKAGE/ORDERING INFORMATION
( Top View )
APE8981X-X
EN Function
Package Type
MP : ESOP-8
A : Internal Pull Low
GN3 : DFN 3x3-10L B : Internal Pull High
POK
1
EN
2
( Top View )
8 GND
7 FB
GND
VIN
3
6
VCNTL
4
5 NC
VOUT
VOUT
VOUT
VOUT
FB
POK
1
2
3
4
5
GND
10 VCNTL
9 VIN
8 VIN
7 VIN
6 EN
DFN 3x3-10L
ESOP-8
ABSOLUTE MAXIMUM RATINGS (Note1)
CNTL Supply Voltage (VCNTL) --------------------------- -0.3V To 6.5V
Input Supply Voltage (VIN) ------------------------------- -0.3V To 6.5V
EN & FB Pin Voltage (VEN/VFB) ------------------------- -0.3V To VCNTL+0.3V
Power Good Voltage (VPOK) ---------------------------- -0.3V To 6.5V
Power Dissipation (PD) ---------------------------------- 2.5W
Storage Temperature Range (T ST) -------------------- -65°C To 150°C
Junction Temperature Range (T J) --------------------- -40°C To 150°C
Thermal Resistance Junction to Ambient (Rth ja)Note
ESOP-8 ------- 40°C/W
DFN 3x3-10L
Thermal Resistance Junction to Case (Rth jc)
62.5°C/W
Note
ESOP-8 ------- 15°C/W
DFN 3x3-10L
17°C/W
Note. mounted on a Demo board
RECOMMENDED OPERATING CONDITIONS
Operating Junction Temperature Range (T OJ) ----- -40°C To 125°C
Operating Ambient Temperature Range (T OA) ----- -40°C To 85°C
VCNTL Supply Voltage (VCNTL) ------------------------- 3V To 6V
Input Supply Voltage (VIN) ------------------------------- 1.1V To 5.5V
Output Voltage (VOUT)@VCNTL > VOUT + 2.5V ------- 0.8V To 2.8V
Output Cunrrent (IOUT) ------------------------------------ 0A To 3A
2
Advanced Power
Electronics Corp.
APE8981
ELECTRICAL SPECIFICATIONS
VCNTL= 5V, VIN=1.8V, VOUT=1.2V, TA=25oC unless otherwise specified
Parameter
VIN POR Threshold
SYM
VIN
VIN POR Hysteresis
VIN(hys)
VCNTL Nominal Supply Current
ICNTL
VCNTL Shutdown Current
ISD
Feedback Voltage
VFB
EN= VCNTL
RDS(ON)
On Resistance
VDROP
Dropout Voltage
VOUT Pull Low Resistance
Soft Start Time
MAX
1
UNITS
-
0.5
-
V
mA
1.3
-
-
1
APE8981MP-B
-
10
30
0.784
0.8
0.816
V
-
0.5
1
%
-
105
150
mΩ
IOUT = 2A, VCNTL=5V, VOUT = 1.2V
-
0.21
0.3
V
EN=0V
-
40
-
Ω
-
0.2
-
ms
EN=0V
VCNTL=3 ~ 6V, IOUT=10mA,
VIN=VOUT+0.5~5.5V
IOUT=100mA, VCNTL=VEN=5.0V,
VOUT=1.2V
Enable
1.2
-
-
VENL
Disable
-
-
0.6
IEN
Current Limit
ILIM
PSRR
V
-
VENH
EN Pin Pull-Up Current
VIN
VCNTL
TYP
0.9
-
TSS
EN Pin Logic High Threshold Voltage
MIN
0.8
APE8981MP-A
IOUT=0A ~ 2A
Load Regulation
Ripple Rejection
TEST CONDITION
EN=5V, APE8981MP-A
-
10
20
EN=GND, APE8981MP-B
-
10
20
3.1
-
-
-
65
-
-
65
-
VCNTL=5V, VIN=VOUT+1V
F=120Hz, IOUT=100mA
uA
V
uA
A
dB
POK Threshold Voltage for Power OK
VPOK
VFB Rising
92%
94%
96%
VFB
POK Threshold Voltage for Power Not OK
VPNOK
VFB Falling
83%
88%
91%
VFB
-
-
0.1
V
TDELAY
0.8
2
10
ms
TSD
-
160
-
o
C
-
40
-
o
C
POK Low Voltage
POK sinks 5mA
POK Delay Time
Thermal Shutdown Threshold
(Note1)
Thermal Shutdown Hysteresis (Note1)
Note1: Guarantee by design, not production tested.
3
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APE8981
PIN DESCRIPTIONS
PIN SYMBOL
POK
PIN DESCRIPTION
Power OK Output Pin
APE8981MP-A: Internal pull low; HIGH for enable, LOW or floating for shutdown.
EN
APE8981MP-B: Internal pull high; HIGH or floating for enable, LOW for shutdown.
VIN
Supply input for power conversion. The pin is monitored for Power-On Reset purpose.
Power input pin of the control circuitry. The pin is monitored for Power-On Reset
VCNTL
purpose.
NC
No Connect
VOUT
Output Voltage
FB
Feedback Pin
GND
GND Pin
BLOCK DIAGRAM
APE8981MP-A
N-MOSFET
VIN
Current
Limit
Power- ON
Reset
VCNTL
EN
Enable
Soft -Start
And
Control Logic
+
Error
Amp
Bandgap
Thermal
Shutdown
FB
+
10uA
-
VOUT
Delay
POK
-
GND
94%
V REF
POK
APE8981MP-B
N-MOSFET
VIN
VCNTL
10uA
EN
Current
Limit
Power- ON
Reset
Enable
-
Soft -Start
And
Control Logic
+
VOUT
Error
Amp
Bandgap
Thermal
Shutdown
+
FB
Delay
POK
-
GND
94%
V REF
POK
4
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APE8981
PIN DESCRIPTION
FB
Connecting this pin to an external resistor divider receives the feedback voltage of the
regulator. The output voltage set by the resistor divider is determined by:
Where R1 is connected from VOUT to FB with Kelvin sensing and R2 is connected from FB
to GND. A bypass capacitor may be connected with R1 in parallel to improve load transient
response. The R2 range in 1K~4.7KΩ for AL output capacitor and 30K~100KΩ for MLCC output
capacitor are recommended.
VIN
Main supply input pins for power conversions. The voltage at this pin is monitored for PowerOn Reset purpose.
VCNTL
Power input pin of the control circuitry. Connecting this pin to a +5V (recommended) supply
voltage provides the bias for the control circuitry. The voltage at this pin is monitored for PowerOn Reset purpose.
POK
Power-OK signal output pin. This pin is an open-drain output used to indicate status of
output voltage by sensing FB voltage. This pin is pulled low when the rising FB voltage is not
above the VPOK threshold or the falling FB voltage is below the VPOK threshold, indicating the
output is not OK.
EN
Enable control pin. Pulling and holding this pin below 0.4V shuts down the output. When reenabled, the IC undergoes a new soft-start cycle. For APE8981MP-B, this pin is internal pulled up
to VCNTL voltage, enabling the regulator. For APE8981MP-A, this pin is internal pulled down to
GND voltage, shutdown the regulator. The pull-high current is 10uA (typ.)
VOUT
Output of the regulator. Please connect Pin 6 using wide tracks. It is necessary to connect
an output capacitor with this pin for closed-loop compensation and improving transient responses.
FUNCTION DESCRIPTION
Power-On-Reset
A Power-On-Reset (POR) circuit monitors both input voltages at VCNTL and VIN pins to
prevent wrong logic controls. The POR function initiates a soft-start process after the two supply
voltages exceed their rising POR threshold voltages during powering on. The POR function also
pulls low the POK pin regardless the output voltage when the VCNTL voltage falls below its falling
POR threshold.
Internal Soft-Start
An internal soft-start function controls rise rate of the output voltage to limit the current surge
at start-up. The typical soft-start interval is about 0.2ms.
Output Voltage Regulation
An error amplifier working with a temperature compensated 0.8V reference and an output
NMOS regulates output to the preset voltage. The error amplifier designed with high bandwidth
and DC gain provides very fast transient response and less load regulation. It compares the
reference with the feedback voltage and amplifies the difference to drive the output NMOS which
provides load current from VIN to VOUT.
5
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Electronics Corp.
APE8981
FUNCTION DESCRIPTION
Current-Limit
The APE8981 monitors the current via the output NMOS and limits the maximum current to
prevent load and APE8981 from damages during overload or short circuit conditions.
Thermal Shutdown
A thermal shutdown circuit limits the junction temperature of APE8981. When the junction
temperature exceeds +160°C, a thermal sensor turns off the output NMOS, allowing the device to
cool down. The regulator regulates the output again through initiation of a new soft-start cycle
after the junction temperature cools by 40 ° C, resulting in a pulsed output during continuous
thermal overload conditions. The thermal shutdown designed.
APPLICATION INFORMATION
Capacitor Selection
Normally, use a MLCC capacitor on the input and output of the APE8981. Larger input
capacitor values provide better supply-noise rejection and transient response. A higher- value
output capacitor may be necessary if large, fast transients are anticipated and the device is
located several inches from the power source. The X5R and X7R type in MLCC is recommended.
For aluminum electrolytic capacitor application, 100uF in input capacitor and 220uF in output
capacitor (30m Ω < ESR < 200m Ω ) are recommended. Output capacitor of larger capacitance
can reduce noise and improve load transient response, stability, and PSRR.
6
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Electronics Corp.
APE8981
TYPICAL PERFORMANCE CHARACTERISTICS
0.820
0.85
VCNTL=5
0.84
0.815
0.83
0.810
0.82
0.805
VO (V)
VO (V)
0.81
0.800
0.80
0.79
0.795
0.78
0.790
0.785
Io=0mA
0.77
Io=1A
0.76
0.780
0.75
3
3.4
3.8
4.2
4.6
5
0
0.5
1
V CNTL (V)
Line Regulation
2
2.5
3
2
2.5
3
Load Regulation
1000
1000
Vo=2.5V
900
Vo=1.2V
900
Vo=1.8V
Vo=1.05V
800
Vo=1.2V
800
700
Vo=1.05V
700
VDROP (mV)
VDROP (mV)
1.5
I OUT (A)
600
500
400
600
500
400
300
300
200
200
100
100
0
0
0
0.5
1
1.5
2
2.5
3
0
0.5
1
I OUT (A)
1.5
I OUT (A)
Dropout Voltage at VCNTL=5V
Dropout Voltage at VCNTL=3.3V
20.0
3.0
18.0
16.0
2.5
ICNTL-SD (uA)
ICNTL (mA)
14.0
2.0
1.5
1.0
12.0
10.0
8.0
6.0
4.0
0.5
2.0
0.0
0.0
-40
-20
0
20
T J (°C)
ICNTL vs. TJ
40
60
80
-40
-20
0
20
40
60
80
T J (°C)
ICNTL-SD (APE8981MP-B) vs. TJ
7
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Electronics Corp.
APE8981
0.90
2.0
0.88
1.8
0.86
1.6
0.84
1.4
VEN (V)
VFB (V)
TYPICAL PERFORMANCE CHARACTERISTICS
0.82
0.80
VENL
1.2
1.0
0.78
0.8
0.76
0.6
0.74
0.4
0.72
0.2
0.70
VENH
0.0
-40
-20
0
20
40
60
80
-40
T J (°C)
0
20
40
60
80
T J (°C)
VFB vs. TJ
EN on with POK Delay
-20
VEN vs. TJ
VEN
VIN
VOUT
VOUT
POK
POK
IOUT=3A
IOUT=3A
VIN Power –ON
8
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Electronics Corp.
APE8981
MARKING INFORMATION
ESOP-8
Part Number
Package Code
8981MP-X
YWWSSS
EN Function
Date Code (YWWSSS)
Y:Last Digit Of The Year
WW:Week
SSS:Sequence
DFN 3x3-10L
Part Number
EN Function
8981-X
YWWS
Date Code (YWWS)
Y:Last Digit Of The Year
WW:Week
S:Sequence
9
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