Advanced Power Electronics Corp. APE8901 .
Advanced Power
Electronics Corp.
APE8901
1A ULTRA LOW DROPOUT LINEAR REGULATOR
DESCRIPTION
FEATURES
The APE8901 is a 1A 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
APE8901 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 APE8901 can be enabled by
other power system. Pulling and holding the EN pin below
0.3V shuts off the output.
The APE8901 is available in ESOP-8 and DFN 2x2
packages. That features small size as SOP-8 with an
Exposed Pad to reduce the junction-to-case resistance,
being applicable in 2~3W applications.
Ultra Low Dropout - 0.2V(typical) at 1A 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 2x2 Pb-Free Packages.
TYPICAL APPLICATION CIRCUIT
1. Using an Output Capacitor with ESR > 20mΩ
.
R3
1K
U1
VCNTL=5V
VIN=1.5V
VIN
VCNTL
C2
ON
POK
EN
C1
OFF
1uF
NC
C3
100uF
0.1uF
VOUT
GND
FB
APE8901
Vout=1.2V/1A
R1
1K
C6
12~48nF
R2
2K
C4
C5
220uF
0.1u
2. Using an MLCC as the Output Capacitor
R3
1K
U2
VCNTL=5V
VCNTL
VIN=1.5V
VIN
C3
ON
POK
EN
C1
1uF
NC
22uF
VOUT
OFF
GND
APE8901
VOUT=VFB x (1+R1/R2)
VFB =0.8V
Data and specifications subject to change without notice
Vout=1.2V/1A
FB
R1
39K
C6
C5
56pF
22u
R2
78K
1
201010203
Advanced Power
Electronics Corp.
APE8901
ABSOLUTE MAXIMUM RATINGS (at TA=25oC)
VCNTL Supply Voltage (VCNTL) --------------------------- -0.3V to 7V
VIN Supply Voltage (VIN) ----------------------------------
-0.3V to 6V
EN & FB Pin Voltage (VI/O) ------------------------------- -0.3V to VCNTL+0.3V
Power Voltage (VPOK) --------------------------------------- -0.3V to 7V
Power Dissipation (PD)
ESOP-8 ------- 3W
DFN 2x2 ------ 0.8W
Storage Temperature Range (TST) ---------------------- -65°C To 150°C
Junction Temperature Range (TJ) ----------------------- -40°C To 125°C
Operating Temperature Range (TOP) ------------------- -40°C To 85°C
Thermal Resistance Junction to Ambient (Rth ja)
ESOP-8 ------- 40°C/W
DFN 2x2 ------ 125°C/W
Thermal Resistance Junction to Case (Rthjc)
ESOP-8 ------- 15°C/W
DFN 2x2 ------ 20°C/W
Note. Rthja is measured with the PCB copper area (need connect to Expose-Pad) of approximately 1.5 in2 (Multi-layer) by ESOP-8 and DFN-8L packages.
RECOMMENDED OPERATING CONDITIONS
VCNTL Supply Voltage (VCNTL) --------------------------
3V to 6V
VIN Supply Voltage (VIN) ----------------------------------
1V to 5.5V
.
Output Voltage (VOUT) -------(V CNTL-VOUT > 1.9V)----- 0.8V to 2.8V
Output Current (I OUT) --------------------------------------- 0 to 1A
ORDERING / PACKAGE INFORMATION
APE8901X
Package Type
MP : ESOP-8
GN2 : DFN 2x2
GND FB VOUT NC
( Top View )
POK
1
EN
2
VIN
3
VCNTL
4
8 GND
8
7 FB
GND
6
6
5
GND
VOUT
5 NC
ESOP-8
7
1
2
POK EN
3
4
VIN VCNTL
DFN 2x2
(TOP VIEW)
2
Advanced Power
Electronics Corp.
APE8901
ELECTRICAL SPECIFICATIONS
o
(VCNTL = 5V, VIN = 1.5V, VOUT = 1.2V, TA=25 C unless otherwise specified)
Parameter
SYM
VCNTL POR Threshold
VCNTL
VCNTL POR Hysteresis
TEST CONDITION
MIN
TYP
MAX
UNITS
2.5
2.7
2.9
V
VCNTL(hys)
-
0.4
-
V
VIN POR Threshold
VIN
0.8
0.9
1
V
VIN POR Hysteresis
VIN(hys)
VCNTL Nominal Supply Current
ICNTL
VCNTL Shuntdown Current
ISD
Feedback Voltage
VFB
Ripple Rejection
10
30
uA
V
0.25
%
VOUT<2.0V,IOUT=1A
-
200
250
2.0V<VOUT<2.8V,IOUT=1A
-
250
300
EN=0V
-
90
120
Ω
-
2
-
ms
VENH
Enable
1.2
-
-
VENL
Disable
-
-
0.4
-
50
-
mV
EN=GND
-
10
-
uA
1.2
-
-
A
-
70
-
-
65
-
VFB Falling
-
0.4
-
V
ILIM
VIN
VCNTL
-
0.816
IEN
Current Limit
mA
0.8
EN Hysteresis
EN Pin Pull-Up Current
V
2
0.06
TSS
EN Pin Logic High Threshold Voltage
-
1
-
VOUT Pull Low Resistance
VCNTL=3 ~ 6.0V
0.5
0.784
VDROP
Soft Start Time
EN= 0V
0.4
IOUT=0A ~ 1A
Load Regulation
Dropout Voltage
EN= VCNTL
PSRR
Under-Voltage Threshold
o
VCNTL=3~6.0V, TJ= -40 ~ 125 C
F=120Hz, IOUT=100mA
.
mV
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
-
0.25
0.4
V
POK Low Voltage
POK Delay Time
Thermal Shutdown Temp
POK sinks 5mA
TDELAY
0.8
2
10
mS
TSD
-
150
-
°C
-
40
-
°C
Thermal Shutdown Hysteresis
PIN DESCRIPTIONS
PIN SYMBOL
FB
PIN DESCRIPTION
Feedback Pin
EN
Internal Pull High.
EN=High or Floating → Enable
EN=Low → Shutdown Mode
VIN
Input voltage.
POK
Power OK Output Pin
VCNTL
NC
CNTL Pin Input Voltage
No connect
VOUT
Output Voltage
GND
GND Pin.
3
Advanced Power
Electronics Corp.
APE8901
BLOCK DIAGRAM
N-MOSFET
VIN
EN
Enable
Soft-Start
And
Control Logic
UV
Thermal
Shutdown
+
Error
Amp
-
+
Bandgap
FB
0.4V
Delay
POK
-
GND
90Ω
+
VCNTL
Current
Limit
Power -ON
Reset
VOUT
90%
Vref
POK
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 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 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 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 reenabled, the IC undergoes a new soft-start cycle. Left this pin open, this pin is internal pulled up to
VCNTL voltage, enabling the regulator.
4
Advanced Power
Electronics Corp.
APE8901
PIN DESCRIPTION
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 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.
Current-Limit
The APE8901 monitors the current via the output NMOS and limits the maximum current to
prevent load and APE8901 from damages during overload or short circuit conditions.
.
Under-Voltage Protection (UVP)
The APE8901 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 APE8901 starts a new
soft-start to regulate output.
Thermal Shutdown
A thermal shutdown circuit limits the junction temperature of APE8901. 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 40°C, resulting in a pulsed output during continuous thermal
overload conditions. The thermal shutdown designed
5
Advanced Power
Electronics Corp.
APE8901
TYPICAL PERFORMANCE CHARACTERISTICS
VCNTL Supply Current
VCNTL Shutdown Current
50
VCNTL Shutdown Current (uA)
VCNTL Supply Current (mA)
3
2.5
2
1.5
1
VIN=1.5V
VOUT=1.2V
No Load
0.5
0
40
30
20
10
0
3
3.5
4
4.5
5
5.5
6
3
3.5
VCNTL (V)
VCNTL VS Feedback Voltage
5
5.5
6
Temperature VS VCNTL Supply Current
4
VIN=1.5V
VCNTL=5V
VOUT=1.2V
No Load
3.5
0.82
0.8
.
0.78
VIN=1.5V
VOUT=1.2V
Load=100mA
0.76
VCNTL Supply Current (mA)
0.84
Feedback Voltage (V)
4.5
VCNTL (V)
0.86
0.74
3
2.5
2
1.5
1
0.5
0
3
3.5
4
4.5
5
5.5
-40℃ -20℃ 0℃
6
VCNTL (V)
25℃ 50℃ 85℃ 105℃ 125℃
Temperature (℃)
Load VS Dropout
Load VS Feedback Voltage
0.84
600
0.83
500
VCNTL=5V
0.82
Dropout Voltage (mV)
Feedback Voltage (V)
4
0.81
0.8
0.79
0.78
VIN=1.5V
VCNTL=5V
VOUT=1.2V
0.77
0.76
400
VOUT=3.0V
300
VOUT=2.5V
200
VOUT=1.8V
VOUT=1.2V
100
0
3
3.5
4
4.5
Load (mA)
5
5.5
6
0
200
400
600
800
1000
Load (mA)
6
Advanced Power
Electronics Corp.
APE8901
TYPICAL PERFORMANCE CHARACTERISTICS
Temperature VS VCNTL UVLO
3
0.84
2.9
0.83
2.8
VCNTL UVLO (V)
Feedback Voltage (V)
Temperature VS Feedback Voltage
0.85
0.82
0.81
0.8
0.79
0.78
VIN=1.5V
VCNTL=5V
VOUT=1.2V
Load=10mA
0.77
0.76
Rising
2.7
2.6
2.5
2.4
2.3
Falling
2.2
2.1
0.75
2
-40℃ -20℃ 0℃
25℃ 50℃ 85℃ 105℃ 125℃
-40℃ -20℃ 0℃
Temperature (℃)
25℃ 50℃ 85℃ 105℃ 125℃
Temperature (℃)
Power –ON
Load Transient
(VIN=1.5V, VCNTL=5V,VOUT=1.2V,Laod=1A)
(VIN=1.5V, VCNTL=5V,VOUT=1.2V,Laod=10m~1A)
VCNTL
EN
VOUT
IIN
VOUT
.
IOUT
Enable –ON
Enable –OFF
(VIN=1.5V, VCNTL=5V,VOUT=1.2V,Laod=1A)
(VIN=1.5V, VCNTL=5V,VOUT=1.2V,No Laod)
VCNTL
EN
EN
VOUT
VOUT
IIN
7
Advanced Power
Electronics Corp.
APE8901
MARKING INFORMATION
ESOP-8
Part Number
Package Code
8901MP
YWWSSS
H3
XXX
Date Code (YWWSSS)
Y:Last Digit Of The Year
WW :Week
SSS:Sequence
Part Number : H3
Date Code
.
8
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