Advanced Power
Y
Electronics Corp.
ULTRA LOW OUTPUT VOLTAGE LINEAR N-FET CONTROLLER
FEATURES DESCRIPTION
Low ESR Output Capacitor (MLCC and POSCAP)
Applicable
0.5V Reference Voltage with 2% Accuracy
Internal Soft-Start
Enable Control
Under-Voltage Short Circuit Protection
Fast Transient Response
Power OK Output with a Delay Time
Adjustable Output Voltage Down to 0.5V
Drive N-Channel MOSFETs
Halogen Free & RoHS Compliant
TYPICAL APPLICATION
The APE8858 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 APE8858 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 APE8858 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.
APE8858
Vin=1.8V
VCC=5V
U1
1
VCC
C3
0.1uF
25
GND FB
3
POK
APE8858
VOUT = 0.5V * (1 + ------ )
VFB = 0.5V ; R2 range 1 ~ 100k
10K
ORDERING INFORMATIO
APE8858 -HF
Package
: SOT-26
Halogen Free
DRV
EN
C1
R1
R2
10K
4.7uF
Vout=1.5V
C2
10uF
Q1
6
4
MOSFET N
1000pF
20K
R1
R2
Data and specifications subject to change without notice
1
200905086
Advanced Power
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Electronics Corp. APE8858
ABSOLUTE MAXIMUM RATINGS
T
(at
=25°C)
A
VCC …………………………………………………
DRV to GND …………………………………………
-0.3V to 7V
-0.3V to VCC+0.3V
Power Dissipation (SOT-26) ……………………..... 0.4W
Storage Temperature Range ………………………
Operating Temperature Range ……………………
-65 to 150°C
-40 to 85°C
Junction Temperature Range ……………………… -40 to 125°C
PACKAGE INFORMATION
(Top View)
VCC DRV
GND FB
POK
1
2
3
6
5
EN
4
SOT-26
Rthja=250°C/W
ELECTRICAL SPECIFICATIONS
(VIN=1.5V, V
SHDN=VIN
, TA=25°C, CIN=C
=1µF, unless otherwise noted.)
OUT
Parameter SYM TEST CONDITION MIN TYP MAX
Supply Voltage Range V
Input Voltage UVLO Threshold V
Input Voltage UVLO Hysteresis V
Supply Current I
Shutdown Current I
Feedback Voltage V
Feedback Pin Input Current I
CC
UVLO
HYST
CC
SD
FB
FB
V
rising - 3.75 -
CC
V
falling - 0.25 - V
CC
EN= V
CC
EN= 0V -1 - 1 uA
VFB =0.5V -100 - 100 nA
4.5 - 5.5 V
- 0.4 0.8
0.49 0.5 0.51 V
UNITS
V
mA
Soft Start Time TSS - 1 - ms
EN Pin Logic High threshold voltage V
EN Pin Input Current
Output Voltage UVLO Threshold
Ton Duty T
DRV Output Current mA
DRV Pin Output Voltage
POK Threshold Voltage for Power
OK
VENH Enable 1.3 - -
V
ENL
I
EN
V
TH(UV)
ON
I
DRV(SRC)
I
DRV(SINK)
V
DRV
V
POK
Disable - - 0.5
I
=0mA, VIN=5V -1
OUT
VFB Falling 0.2 0.25 0.3 V
V
< 0.25V - 30 - %
FB
Sourcing,VFB=0.48V
Sinking ,VFB=0.52V
-
20
-
20
VFB=0.48V,VCC=5V, no load 4.9 - 5.0 V
VFB Rising
90% 93%
+1 uA
-
-
96%
VFB
2
Advanced Power
Electronics Corp. APE8858
ELECTRICAL SPECIFICATIONS(Cont.)
Parameter SYM TEST CONDITION MIN TYP MAX
POK Threshold Voltage for Power
Not OK
POK Low Voltage
POK Delay Time
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis - 50 - °C
V
PNOK
T
DELAY
TSD - 150 - °C
VFB Falling
POK sinks 1mA - 50 100
82% 85% 88%
0.8 2 10
PIN DESCRIPTIONS
PIN SYMBOL PIN DESCRIPTION
FB
GND
DRV
POK
EN
VCC
Feedback Pin
Common Ground Pin
Gate Drive to N-FET
Power ok Output Pin
H : Normal Operation
L : Shutdown
Input Voltage
UNITS
VFB
mV
ms
BLOCK DIAGRAM
3
Advanced Power
g
g
(
j
Electronics Corp. APE8858
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 fallin
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
ulation.
re
Under-Voltage Protection (UVP)
APE8858 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 ) , APE8858 starts a new soft-start to regulate output.
POR threshold.
Thermal Shutdown
A thermal shutdown circuit limits the junction temperature of APE8858. When the
unction 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.
TYPICAL CHARACTERISTICS
Temperature Vs V
0.512
0.509
0.506
0.500
VFB (V)
0.497
0.494
0.491
0.488
-40℃ -25℃ 0℃ 25℃ 50℃ 75℃ 100℃
Temperature
FB
VOUT (V)
1.215
1.213
1.211
1.209
1.207
1.205
1.203
1.201
1.199
1.197
1.195
APE8858
Load Regulation(V
0.5
0
1
IOUT(A)
1.5
OUT
2
2.5
3
5
ADVANCED POWER ELECTRONICS CORP.
L
L
Package Outline : SOT-26
G
C
A
D
Millimeters
SYMBOLS
A 2.70 2.90 3.10
B 2.60 2.80 3.00
C 1.40 1.60 1.80
B
D 0.30 0.43 0.55
E 0.00 0.05 0.10
H 1.20REF
G
I
J
L
MIN NOM MAX
1.90REF
0.12REF
0.37REF
0.95REF
H
E
I
1.All Dimension Are In Millimeters.
J
2.Dimension Does Not Include Mold Protrusions.
Part Marking Information & Packing : SOT-26
Part Number : RO
ROXXX
Date Code : XXX
6
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