A-POWER APE8858AY

Advanced Power
Electronics Corp.
APE8858A
FAST TRANSIENT RESPONSE LINEAR CONTROLLER
FEATURES
DESCRIPTION
Low ESR Output Capacitor (MLCC and POSCAP)
Applicable
0.5V Reference Voltage with 2% Accuracy
Internal Soft-Start
Support VID Application Circuit
Integrated Hard Short-circuit protection
Fast Transient Response
Power OK Output with a Delay Time
Adjustable Output Voltage Down to 0.5V
Over-Temperature Protection
RoHS Compliant & Haloge Free
The APE8858A is an ultra low output voltage linear NFET controller. This product is specifically designed to
provide well supply voltage for front-side-bus termination on
motherboards and NB applications. The APE8858A
integrates many functions. A Power-On-Reset (POR) circuit
monitors supply voltages to prevent wrong operations. A
POK indicates the output status with time delay which is set
internally. It can control other converter for power sequence.
The APE8858A can be enabled by other power system.
A 0.5V reference voltage with 2% accuracy provide
tight regulation of the output voltage, enable control, open
drain power good signal, under-voltage protection and soft
start.
The APE8858A is available in a space saving SOT-26
package.
TYPICAL APPLICATION
VIN
APE8858A
VCC =5V
CV CC
0.1uF
RP OK
100k
VCC
DRV
POK
FB
EN
GND
Q1
AP4434AGH
Cin
10uF
VOUT =1.8V
R1
26k
CF
Cout
10uF
R2
10k
Data and specifications subject to change without notice
1
20130108V1.1
Advanced Power
Electronics Corp.
APE8858A
ABSOLUTE MAXIMUM RATINGS (at TA=25°C)
VCC -----------------------------------------------------------
-0.3V to 7V
DRV to GND ------------------------------------------------- -0.3V to VCC+0.3V
Other Pin ------------------------------------------------------ -0.3V to 6V
Power Dissipation (SOT-26) ----------------------------
0.4W
Storage Temperature Range ---------------------------- -65 to 150°C
Operating Temperature Range ------------------------- -40 to 85°C
Junction Temperature Range --------------------------- -40 to 125°C
PACKAGE / ORDERING INFORMATION
(Top View)
APE8858A X
Package Type
Y : SOT-26
VCC
1
6
GND
2
5 FB
POK
3
4
DRV
EN
SOT-26
Rthja=250°C/W
ELECTRICAL SPECIFICATIONS
(VIN=1.5V, VSHDN=VIN, TA=25°C, CIN=COUT=1µF, unless otherwise noted.)
Parameter
SYM
Supply Voltage Range
VCC
TEST CONDITION
MIN
TYP
MAX
UNITS
4.5
-
5.5
V
Input Voltage UVLO Threshold
VUVLO
VCC rising
-
3.75
-
V
Input Voltage UVLO Hysteresis
VHYST
VCC falling
-
0.25
-
V
Supply Current
ICC
EN= VCC
-
0.4
0.8
mA
Shutdown Current
ISD
EN= 0V
-1
-
1
uA
Feedback Voltage
VFB
0.49
0.5
0.51
V
Feedback Pin Input Current
IFB
-100
-
100
nA
ms
Soft Start Time
EN Pin Logic High Threshold Voltage
EN Pin Input Current
Output Voltage UVLO Threshold
Ton Duty
DRV Output Current
VFB =0.5V
-
1
-
VENH
TSS
Enable
1.3
-
-
VENL
Disable
-
-
0.5
IOUT=0mA, VIN=5V
-1
-
+1
uA
VTH(UV)
VFB Falling
0.2
0.25
0.3
V
TON
VFB < 0.25V
-
30
-
%
Sourcing,VFB=0.48V
-
20
-
-
20
-
4.8
-
5.0
V
93%
95%
97%
VFB
IEN
IDRV(SRC)
IDRV(SINK) Sinking ,VFB=0.52V
DRV Pin Output Voltage
VDRV
VFB=0.48V,VCC=5V, no load
POK Threshold Voltage for Power
OK
VPOK
VFB Rising
V
mA
2
Advanced Power
Electronics Corp.
APE8858A
ELECTRICAL SPECIFICATIONS(Cont.)
Parameter
SYM
POK Threshold Voltage for Power
Not OK
VPNOK
POK Low Voltage
TEST CONDITION
VFB Falling
POK sinks 1mA
POK Delay Time
TDELAY
Thermal Shutdown Temperature
TSD
Thermal Shutdown Hysteresis
MIN
TYP
MAX
UNITS
86%
89%
93%
VFB
-
50
100
mV
0.8
2
10
ms
-
150
-
°C
-
50
-
°C
PIN DESCRIPTIONS
PIN SYMBOL
FB
PIN DESCRIPTION
Feedback Pin
GND
Common Ground Pin
DRV
Gate Drive to N-FET
POK
Power ok Output Pin
H : Normal Operation
EN
L : Shutdown
Input Voltage
VCC
BLOCK DIAGRAM
DRV
VCC
EN
Power On
Reset
Enable
Error
Amp
Bandgap
Soft -Start
And
Control Logic
Thermal
Shutdown
UV
FB
0.25V
GND
Delay
POK
95%
VREF
POK
3
Advanced Power
Electronics Corp.
APE8858A
FUNCTION DESCRIPTIONS
Power-On-Reset
A Power-On-Reset (POR) circuit monitors input voltages at VCC pins to prevent
wrong logic controls. The POR function initiates a soft-start process after the supply
voltages exceed the rising POR threshold voltages during powering on. The POR
function also pulls low the POK pin regardless the output voltage when the VCC voltage
falls below it’s 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 1ms.
Output Voltage Regulation
An error amplifier working with a temperature compensated 0.5V 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.
Under-Voltage Protection (UVP)
APE8858A 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 ( ~ 70% Duty ) , APE8858A starts a new soft-start to regulate output.
Thermal Shutdown
A thermal shutdown circuit limits the junction temperature of APE8858A. 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.
4
Advanced Power
Electronics Corp.
APE8858A
TYPICAL PERFORMANCE CHARACTERISTICS
POK
with CF=1nF
VOUT
without CF
VDRV
IOUT=0A~1.5A
IOUT
Fig.2 Load Transient, 3Vi to 1.8Vo
520
4.0
516
3.8
512
3.6
508
3.4
504
3.2
VCC (V)
VFB (mV)
Fig.1 Hard Short Circuit Protection
500
3.0
496
2.8
492
2.6
488
2.4
rising
484
2.2
falling
480
2.0
-40
-20
0
20
40
60
80
100
120
-40
-20
0
T J (°C)
40
60
80
T J (°C)
Fig.3 Feedback Voltage vs. Temperature
Fig.4 UVLO vs. Temperature
1.0
1.0
0.9
0.9
0.8
0.8
0.7
0.7
ISD (uA)
IQ (mA)
20
0.6
0.5
0.6
0.5
0.4
0.4
0.3
0.3
0.2
0.2
0.1
0.1
0.0
0.0
-40
-20
0
20
40
60
T J (°C)
Fig.5 Supply Current vs. Temperature
80
-40
-20
0
20
40
60
80
T J (°C)
Fig.6 Shutdown Current vs. Temperature
5
Advanced Power
Electronics Corp.
APE8858A
APPLICATION CIRCUIT
VIN =1.05V
U1
V CC=5V
C1
0.1uF
RP OK
VCC
DRV
POK
FB
Q1
AP4434AGH
Cin
10uF
POK
100k
EN
EN
V OUT=0.9V/6A
R1
10k
GND
CF
1nF
+
Cout
330uF (ESR >15mΩ)
APE8858A
R2
30k
R3
71k
VID0
R5
Q2
10k
C2
4.7nF
R4
34k
VID1
R6
Q3
10k
C3
4.7nF
VID1
VID0
Vo (V)
0
0
0.675
0
1
0.725
1
0
0.8
1
1
0.9
APE8858A with output voltage step function from 0.9V to 0.675V
6
Advanced Power
Electronics Corp.
APE8858A
MARKING INFORMATION
SOT-26
Part Number : HE
HESS
Date Code
SS:2004,2008,2012…
SS:2003,2007,2011…
SS:2002,2006,2010…
SS:2001,2005,2009…
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