APE8858 Format - Advanced Power Electronics Corp

Advanced Power
Electronics Corp.
APE8858
ULTRA LOW OUTPUT VOLTAGE LINEAR N-FET CONTROLLER
FEATURES
DESCRIPTION
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.
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
Vin=1.8V
C1
VCC=5V
4.7uF
U1
1
C3
0.1uF
2
3
VCC
DRV
GND
FB
POK
EN
6
Q1
MOSFET N
Vout=1.5V
5
4
1000pF
APE8858
R1
20K
C2
R2
10K
10uF
R1
VOUT = 0.5V * (1 + ------ )
R2
VFB = 0.5V ; R2 range 1 ~ 100k
10K
ORDERING INFORMATION
APE8858
-HF
Package
Halogen Free
Y : SOT-26
Data and specifications subject to change without notice
1
200905086
Advanced Power
Electronics Corp.
APE8858
ABSOLUTE MAXIMUM RATINGS (at T =25°C)
A
VCC
…………………………………………………… -0.3V to 7V
DRV to GND …………………………………………… -0.3V to VCC+0.3V
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 INFORMATION
(Top View)
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
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
ICC
EN= VCC
-
0.4
0.8
mA
EN= 0V
Supply Voltage Range
Supply Current
VCC
Shutdown Current
ISD
Feedback Voltage
VFB
Feedback Pin Input Current
IFB
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
TSS
-1
-
1
uA
0.49
0.5
0.51
V
-100
-
100
nA
ms
-
1
-
VENH
Enable
1.3
-
-
VENL
Disable
-
-
0.5
IOUT=0mA, VIN=5V
-1
-
+1
VTH(UV)
VFB Falling
0.2
0.25
0.3
V
TON
VFB < 0.25V
-
30
-
%
Sourcing,VFB=0.48V
-
20
-
-
20
-
4.9
-
5.0
V
90%
93%
96%
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
uA
mA
2
Advanced Power
Electronics Corp.
APE8858
ELECTRICAL SPECIFICATIONS(Cont.)
Parameter
SYM
POK Threshold Voltage for Power
Not OK
VPNOK
POK Low Voltage
POK Delay Time
Thermal Shutdown Temperature
TEST CONDITION
VFB Falling
POK sinks 1mA
TDELAY
TSD
Thermal Shutdown Hysteresis
MIN
TYP
MAX
UNITS
82%
85%
88%
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
EN
VCC
H : Normal Operation
L : Shutdown
Input Voltage
BLOCK DIAGRAM
3
Advanced Power
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 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)
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.
Thermal Shutdown
A thermal shutdown circuit limits the junction temperature of APE8858. 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.
APE8858
TYPICAL CHARACTERISTICS
Load Regulation(VOUT )
Temperature Vs V FB
0.512
1.215
0.509
1.213
1.211
1.209
0 503
VOUT (V)
VFB (V)
0.506
0.500
0.497
1.207
1.205
1.203
1.201
0.494
1.199
0.491
1.197
1.195
0.488
-40℃ -25℃
0℃
25℃
Temperature
50℃
75℃ 100℃
0
0.5
1
1.5
2
2.5
3
IOUT(A)
5
ADVANCED POWER ELECTRONICS CORP.
Package Outline : SOT-26
G
L
L
Millimeters
C
A
SYMBOLS
MIN
NOM
MAX
A
2.70
2.90
3.10
B
2.60
2.80
3.00
C
1.40
1.60
1.80
D
0.30
0.43
0.55
E
0.00
0.05
0.10
B
D
H
1.20REF
G
1.90REF
I
0.12REF
J
0.37REF
L
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