Power APE8973 3a ultra low dropout linear regulator Datasheet

Advanced Power
Electronics Corp.
APE8973
3A ULTRA LOW DROPOUT LINEAR REGULATOR
FEATURES
DESCRIPTION
The APE8973 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 APE8973 integrates many
functions. A Power-On-Reset (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 APE8973
can be enabled by other power system. Pulling and holding
the EN pin below 0.3V shuts off the output.
The APE8973 is available in ESOP-8 and DFN 3x310L packages which features small size as an Exposed Pad
to reduce the junction-to-case resistance, being applicable
in 2~3W applications.
Ultra Low Dropout - 0.23V(typical) at 3A
Output Current
Low ESR Output Capacitor (Multi-layer
Chip Capacitors (MLCC) Applicable
0.8V Reference Voltage
Fast Transient Response
Adjustable Output Voltage by External Resistors
Power-On-Reset Monitoring on Both
VCNTL and VIN Pins
Internal Soft-Start
Under-Voltage Protection
Current-Limit and Thermal Shutdown Protection
Power-OK Output with a Delay Time
ESOP-8 and DFN 3x3-10L Pb-Free Package.
TYPICAL APPLICATION
1.Using an Output Capacitor with ESR > 20mΩ
R3
1K
U1
VCNTL=5V
VIN=1.5V
VIN
VCNTL
C2
VOUT
POK
ON
C1
OFF
100uF
0.1uF
VOUT
EN
GND
1uF
C3
FB
Vout=1.2V/3A
APE8973
R1
1K
C6
12~48nF
R2
2K
2.Using an MLCC as the Output Capacitor
ESOP- 8
VCNTL
ON
POK
EN
C1
1uF
OFF
0.1u
VIN=1.5V
VIN
C3
10uF
VOUT
VOUT
Vout=1.2V/3A
GND
FB
APE8973MP
VOUT=VFB*(1+R1/R2)
VFB = 0.8V
Data and specifications subject to change without notice
C5
220uF
R3
10K
U2
VCNTL=5V
C4
R1
39K
C6
56pF
C5
10uF
R2
78K
1
201005311
Advanced Power
Electronics Corp.
APE8973
TYPICAL APPLICATION
2.Using an MLCC as the Output Capacitor
DFN 3x3-10L
R3
10K
U2
VCNTL=5V
VIN
VCNTL
POK
ON
EN
C1
1uF
VIN=1.5V
VIN
C3
10uF
VOUT
VOUT
Vout=1.2V/3A
OFF
GND
FB
R1
39K
APE8973GN3
VOUT=VFB*(1+R1/R2)
VFB = 0.8V
C6
56pF
C5
10uF
R2
78K
ABSOLUTE MAXIMUM RATINGS (at TA=25°C)
VCNTL Supply Voltage(VCNTL) -------------------------- -0.3V to 7V
VIN Supply Voltage(VIN) ---------------------------------- -0.3V to 7V
EN and FB Pin Voltage(VI/O) ----------------------------
-0.3V to VCNTL+0.3V
Power Good Voltage(VPOK) ------------------------------ -0.3V to 7V
Power Dissipation(PD) ------------------------------------- 3W
Storage Temperature Range(TST) ---------------------
-65°C to +150°C
Junction Temperature Range(T J) ----------------------
-40°C To 150°C
Operating Temperature Range (T OP) ------------------ -40°C to +85°C
Thermal Resistance from Junction to Case(Rth JC)
15°C/W
Thermal Resistance from Junction to Ambient(RthJA)
40°C/W
RECOMMENDED OPERATING CONDITIONS
VCNTL Supply Voltage(VCNTL) -------------------------- 3V to 6V
VIN Supply Voltage(VIN) ---------------------------------- 1.2V to 6V
Output Voltage(VOUT) -------------------------------------- 0.8V to VIN-VDROP (VCNTL - VOUT > 1.4V)
Output Current(IOUT) --------------------------------------- 0 to 3A
Note: RthJA is measured with the PCB copper area (need connect to Expose-Pad) of approximately 1.5 in 2 (Multi-layer)
ORDERING/PACKAGE INFORMATION
APE8973X
Package Type
MP : ESOP-8
GN3 : DFN 3x3-10L
( Top View )
GND
1
FB
2
VOUT
3
VOUT
4
8 EN
Exposed
Pad
7 POK
6
VCNTL
5
VIN
VIN 1
VIN 2
VCNTL 3
(GND)
10
NC
9
VOUT
8
POK 4
7
VOUT
FB
EN 5
6
GND
DFN 3x3-10L
ESOP-8
2
Advanced Power
Electronics Corp.
APE8973
ELECTRICAL SPECIFICATIONS
(VCNTL = 5V, VIN = 1.5V, VOUT = 1.2V, TA=25°C unless otherwise specified)
Parameter
SYM
MIN
TYP
MAX
UNITS
VCNTL POR Threshold
VCNTL
2.5
2.7
2.9
V
VCNTL POR Hysteresis
VCNTL(hys)
-
0.4
-
V
VIN POR Threshold
VIN
0.8
0.9
1
V
VIN POR Hysteresis
VIN(hys)
-
0.5
-
V
TEST CONDITION
EN= VCNTL
-
1
1.8
mA
VCNTL Shuntdown Current
ISD
EN= 0V
-
50
100
uA
Feedback Voltage
VFB
VCNTL=3.0 ~ 6.0V, IOUT=10mA
0.784
0.8
0.816
V
%
VCNTL Nominal Supply Current
ICNTL
IOUT=0A ~ 3A
Load Regulation
VDROP
Dropout Voltage
VOUT Pull Low Resistance
IOUT = 3A,
VCNTL=5V
-
0.06
0.25
1.2V<VOUT<2.0V
-
0.23
0.3
2.0V≦VOUT<2.8V
-
0.26
0.33
2.8V≦VOUT<3.6V
V
-
0.5
1
EN=0V
-
85
-
Ω
ms
Soft Start Time
TSS
-
2
4
EN Pin Logic High Threshold
Voltage
VENH
Enable
1.2
-
-
VENL
Disable
-
-
0.4
-
50
-
mV
-
10
-
uA
3.3
-
-
A
-
65
-
-
65
-
VFB Falling
-
0.4
-
V
EN Hysteresis
EN Pin Pull-Up Current
IEN
ILIM
Current Limit
Ripple Rejection
VIN
VCNTL
PSRR
Under-Voltage Threshold
EN=GND
VCNTL=3.0~6.0V
TJ= -40 ~ 125°C
F=120Hz, IOUT=100mA
V
dB
POK Threshold Voltage for Power OK
VPOK
VFB Rising
89%
92%
95%
VFB
POK Threshold Voltage for Power
Not OK
VPNOK
VFB Falling
78%
81%
84%
VFB
POK Low Voltage
POK Delay Time
Thermal Shutdown Temp
POK sinks 5mA
TDELAY
TSD
Thermal Shutdown Hysteresis
-
0.25
0.4
V
0.8
2
4
ms
-
160
-
-
50
-
°C
PIN DESCRIPTIONS
PIN SYMBOL
GND
FB
PIN DESCRIPTION
GND Pin
Feedback Pin
Internal Pull High.
EN
EN=High or Floating à Enable
EN=Low à Shutdown mode
VOUT
POK
VCNTL
VCC
EP
Output Voltage pin
Power OK Output Pin
CNTL Pin Input Voltage
Input Voltage
Connect to VIN or GND
3
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Electronics Corp.
APE8973
BLOCK DIAGRAM
N-MOSFET
VIN
VCNTL
EN
Current
Limit
Power -ON
Reset
Enable
Soft-Start
And
Control Logic
VOUT
Error
Amp
-
+
Bandgap
UV
+
FB
0.4V
+
Thermal
Shutdown
Delay
POK
-
GND
92%
Vref
POK
FUNCTION 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:
VOUT = 0.8 x (1 + R1/R2)
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 R1in parallel to improve
load transient response. The recommended R2 and R1 are in the range of 1K~100KΩ.
VIN
Main supply input pins for power conversions. The voltage at this pin is monitored
for Power-On 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 Power-On 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 re-enabled, the IC undergoes a new soft-start cycle. Left this pin open, this pin is
internal pulled up to VCNTL voltage, enabling the regulator.
VOUT
Output of the regulator. Please connect Pin 3 and Pin 4 using wide tracks. It is
necessary to connect an output capacitor with this pin for closed-loop compensation and
improving transient responses.
4
Advanced Power
Electronics Corp.
APE8973
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 2ms.
Current Limit
The APE8973 monitors the current via the output NMOS and limits the maximum
current to prevent load and APE8973 from damages during overload or short circuit
conditions.
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.
Under Voltage Protection (UVP)
The APE8973 monitors the voltage on FB pin after soft-start process is finished.
Therefore the UVP is disabling during soft-start. When the voltage on FB pin falls below
the under-voltage threshold, the UVP circuit shuts off the output immediately. After a while,
the APE8973 starts a new soft-start to regulate output.
Thermal Shutdown
A thermal shutdown circuit limits the junction temperature of APE8973. When the
junction temperature exceeds +150°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 50°C, resulting in
a pulsed output during continuous thermal overload conditions. The thermal shutdown
designed.
5
Advanced Power
Electronics Corp.
APE8973
VCNTL VS ICNTL
2
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
VCNTL VS VFB
VFB (V)
I CNT L (mA)
TYPICAL PERFORMANCE CHARACTERISTICS
IOUT=0A
3
3.5
4
4.5
VCNTL (V)
5
0.810
0.808
0.806
0.804
0.802
0.800
0.798
0.796
0.794
0.792
0.790
3
5.5
3.5
0.805
VFB(V)
V O U T (V )
0.810
0.800
0.795
VCNTL=5V, VIN=1.5V
0.785
0.5
1
1.5
5
5.5
Temperaute VS VFB
0.815
0
4.5
VCNTL (V)
IOUT VS VOUT
0.790
4
2
2.5
3
IOUT (A)
0.85
0.84
0.83
0.82
0.81
0.80
0.79
0.78
0.77
0.76
0.75
-40
-25
0
25
50
75
100
125
Temperature(℃)
ICNTL(m A)
Temperaute VS ICNTL
2.00
1.80
1.60
1.40
1.20
1.00
0.80
0.60
0.40
0.20
0.00
-40
-25
0
25
50
75
100
125
Temperature(℃)
6
Advanced Power
Electronics Corp.
APE8973
TYPICAL PERFORMANCE CHARACTERISTICS
Enable-ON
Power OK Wave
Output Discharge
Load Transient
7
ADVANCED POWER ELECTRONICS CORP.
Package Outline : ESOP-8
Millimeters
P
MIN
NOM
MAX
A
5.80
6.00
6.20
B
4.80
4.90
5.00
C
3.80
3.90
4.00
D
0°
4°
8°
Q
SYMBOLS
E
0.40
0.65
0.90
F
0.19
0.22
0.25
M
0.00
0.08
0.15
H
0.35
0.42
0.49
L
1.35
1.55
1.75
0.375 REF.
J
B
A2
K
45°
G
1.27 TYP.
P
3.15
3.25
3.35
Q
2.25
2.35
2.45
L
I
J
1.All Dimension Are In Millimeters.
2.Dimension Does Not Include Mold Protrusions.
Part Marking Information & Packing : ESOP-8
Part Number
Package Code
8973MP
YWWSSS
Date Code (YWWSSS)
Y:Last Digit Of The Year
WW:Week
SSS:Sequence
Advanced Power
Electronics Corp.
APE8973
(2) DFN 3x3-10L
(Top View)
(Bottom View)
b
10
D
D1
10
L
Pin 1 Indent
1
1
e
E
e1
E1
A1
A3
A
0.10 C
Symbol
SEATING
PLANE
y
Dimensions In Millimeters
Dimensions In Inches
Min.
Nom.
Max.
Min.
Nom.
Max.
A
-
-
0.90
-
-
0.036
A1
0.00
0.02
0.05
0.000
0.001
0.002
A3
0.20 REF.
0.008 REF.
b
0.18
0.25
0.30
0.007
0.010
0.012
D
2.90
3.00
3.10
0.114
0.118
0.122
D1
1.10
1.20
1.30
0.043
0.047
0.051
E
2.90
3.00
3.10
0.114
0.118
0.122
E1
2.10
2.20
2.30
0.083
0.087
0.091
L
0.45
0.55
0.65
0.018
0.022
0.026
e
0.50 BSC.
0.020 BSC.
e1
2.00 BSC.
0.079 BSC.
y
0.00
-
0.08
0.000
-
0.003
Part Number
8973
YWWS
Date Code (YWWS)
Y:Last Digit Of The Year
WW :Week
S :Sequence
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