Anpec APL5912KA Schematics
APL5912
0.8V Reference Ultra Low Dropout (0.2V@5A) Linear Regulator
Features
• Ultra Low Dropout
- 0.2V (typical) at 5A Output Current
• Low ESR Output Capacitor (Multi-layer Chip
Capacitors (MLCC)) Applicable
• 0.8V Reference Voltage
• High Output Accuracy
- ±1.5% over Line, Load and Temperature
• Fast Transient Response
• Adjustable Output Voltage by External
Resistors
• Power-On-Reset Monitoring on Both VCNTL and
VIN Pins
• Internal Soft-Start
• Current-Limit Protection
• Under-Voltage Protection
• Thermal Shutdown with Hysteresis
• Power-OK Output with a Delay Time
General Description
The APL5912 is a 5A ultra low dropout linear regulator.
This product is specifically designed to provide well supply voltage for front-side-bus termination on motherboard
and NB applications. The IC needs two supply voltages, a
control voltage for the circuitry and a main supply volatege
for power conversion, to reduc e power dissipation and
provide extremely low dropout.
The APL5912 integrates many functions. A Power-OnReset (POR) circuit monitors both supply voltages to prevent wrong operations. A thermal s hutdown 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 APL5912 is enabled by
other power system. Pulling and holding the EN pin below 0.3V shuts off the output.
The APL5912 is available in SOP-8P package which features small size as SOP-8 and an Exposed Pad to reduce
the junction-to-case resistanc e, being applicable in
2~2.5W applications.
• Shutdown for Standby or Suspend Mode
• Simple SOP-8P Package with Exposed Pad
• Lead Free and Green Devices Available
(RoHS Compliant)
Applications
• Front Side Bus VTT (1.2V/5A)
• Note Book PC Applications
• Motherboard Applications
Copyright ANPEC Electronics Corp.
Rev. A.9 - Apr., 2008
Pin Configuration
1
GND
2
FB
VOUT
VOUT
SOP-8P (Top View)
(connected to VIN plane for better heat
dissipation)
= Exposed Pad
VIN
3
4
8
7
6
5
EN
POK
VCNTL
VIN
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APL5912
o
Ordering and Marking Information
APL5912
Assembly Material
Handling Code
Temperature Range
Package Code
Package Code
KA : SOP-8P
Operating Ambient Temperature Range
C : 0 to 70 C
Handing Code
TR : Tape & Reel
Assembly Material
L : Lead Free Device
G : Halogen and Lead Free Device
APL5912 KA :
APL5912
XXXXX
XXXXX - Date Code
Note: ANPEC lead-free products contain molding compounds/die attach materials and 100% matte tin plate termination finish; which
are fully compliant with RoHS. ANPEC lead-free products meet or exceed the lead-free requirements of IPC/JEDEC J-STD-020C for
MSL classification at lead-free peak reflow temperature. ANPEC defines “Green” to mean lead-free (RoHS compliant) and halogen
free (Br or Cl does not exceed 900ppm by weight in homogeneous material and total of Br and Cl does not exceed 1500ppm by
weight).
Block Diagram
0.4V
UV
EN
Soft-Start
and
Control Logic
Power-
On-Reset
Thermal
Limit
VINVCNTL
VREF
0.8V
FB
POK
90%
VREF
Typical Application Circuit
1. Using an Output Capacitor with ESR≥18mΩ
C
CNTL
1µF
R3
1k
POK
EN
Enable
7
POK
APL5912
8
EN
EAMP
6
VCNTL
GND
1
Delay
POK
VIN
VOUT
VOUT
FB
Current
Limit
VOUT
GND
VCNTL
+5V
VIN
OUT
+1.5V
VOUT
+1.2V / 5A
C
IN
5
3
4
2
R2
2k
100µF
R1
1k
C1
(in the range of 12 ~ 48nF)
33nF
C
220µF
Copyright ANPEC Electronics C orp.
www.anpec.com.tw2
Rev. A.9 - Apr., 2008
APL5912
Typical Application Circuit (Cont.)
2. Using an MLCC as the Output Capacitor
R4
10 (in the range of 5.1~15Ω)
6
5
VIN
FB
3
4
2
VOUT
VOUT
1
Enable
POK
EN
R3
1k
C
1µF
CNTL
7
8
VCNTL
POK
APL5912
EN
GND
R2
78k
R1
39k
C1
30pF
C
IN
22µF
C
OUT
22µF
V
CNTL
+5V
V
IN
+1.5V
V
OUT
+1.2V / 5A
V
OUT
(V)
R1 (kΩ) R2 (kΩ)
C1 (pF)
1.05 43 137.6 27
1.5 27 30.86 36
1.8 15 12 68
Absolute Maximum Ratings
Symbol Parameter Rating Unit
V
VCNTL Supply Voltage (VCNTL to GND) -0.3 ~ 7 V
CNTL
VIN VIN Supply Voltage (VIN to GND) -0.3 ~ 3.3 V
V
EN and FB to GND -0.3 ~ V
I/O
V
POK to GND -0.3 ~ 7 V
POK
PD Power Dissipation 3 W
TJ Junction Temperature 150
T
Storage Temperature -65 ~ 150
STG
T
Maximum Lead Soldering Temperature, 10 Seconds 260
SDR
+0.3 V
CNTL
o
C
o
C
o
C
Copyright ANPEC Electronics C orp.
Rev. A.9 - Apr., 2008
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APL5912
Thermal Characteristics
Symbol Parameter Value Unit
Junction-to-Ambient Thermal Resistance in Free Air
Junction-to-Case Thermal Resistance
(Note 2)
17
is measured with the component mounted on a high effective thermal conductivity test board in free air. The exposed pad
Note 1 : θ
θ
JA
θJC
JA
of SOP-8P is soldered directly on the PCB.
Note 2 : The “Thermal Pad Temperature” is measured on the PCB copper area connected to the thermal pad of package.
(Note 1)
40
o
C/W
o
C/W
1
2
VIN
3
4
8
7
6
5
Measured Point
PCB Copper
Recommended Operating Conditions
Symbol Parameter Range Unit
V
VCNTL Supply Voltage 3.1 ~ 6 V
CNTL
VIN VIN Supply Voltage 1.1 ~ 3.3 V
OUT
I
VOUT Output Current 0 ~ 6 A
OUT
V
V
CNTL
CNTL
=3.3±5%
=5.0±5%
V
Output Voltage
0.8 ~ 1.2
0.8 ~ VIN-0.2
TJ Junction Temperature -25 ~ 125
Electrical Characteristics
Refer to “Typical Applic ation Circuits”. These specifications apply over, V
70°C, unless otherwise specified. Typical values refer to TA =25°C.
=5V, VIN=1.5V, V
CNTL
OUT
V
o
C
= 1.2V and TA=0 to
Symbol
Parameter Test Conditions
APL5912
Min Typ Max
Unit
SUPPLY CURRENT
I
VCNTL Supply Current EN = VCNTL, VFB is well regulated. 0.4 1 2 mA
CNTL
ISD VCNTL Shutdown Current EN = GND 180 380
µ
A
POWER-ON-RESET
VCNTL POR Threshold V
Rising 2.7 2.9 3.1 V
CNTL
VCNTL POR Hysteresis 0.4 V
VIN POR Threshold VIN Rising 0.8 0.9 1.0 V
VIN POR Hysteresis 0.5 V
Copyright ANPEC Electronics C orp.
Rev. A.9 - Apr., 2008
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APL5912
Electrical Characteristics (Cont.)
Refer to “Typical Application Circuit”. These specifications apply over, V
= 5V, VIN = 1.5V, V
CNTL
= 1.2V and TA = 0 to
OUT
70°C, unless otherwise specified. Typical values refer to TA =25°C.
Symbol
Parameter Test Conditions
OUTPUT VOLTAGE
V
Reference Voltage FB =VOUT 0.8 V
REF
Output Voltage Accuracy I
Line Regulation V
Load Regulation I
=0A ~ 5A, TJ= -25 ~125oC -1.5 +1.5 %
OUT
=3.3 ~ 5.5V -0.13 0.13 %/V
CNTL
=0A ~ 5A 0.06 0.15 %
OUT
DROPOUT VOLTAGE
Dropout Voltage
I
OUT
OUT
= 5A, V
= 5A, V
=5V, TJ= 25oC 0.15 0.2 V
CNTL
=5V, TJ= -25~125oC 0.25 V
CNTL
I
PROTECTION
V
=5V, TJ= 25oC 7 8 9 A
CNTL
V
=5V, TJ= -25 ~ 125oC 6 A
I
Current Limit
LIM
CNTL
V
=3.3V, TJ= 25oC 6.8 7.8 8.8 A
CNTL
V
=3.3V, TJ= -25 ~ 125oC 6 A
CNTL
TSD Thermal Shutdown Temperature TJ Rising 150
Thermal Shutdown Hysteresis 50
Under-Voltage Threshold VFB Falling 0.4 V
ENABLE AND SOFT-START
EN Logic High Threshold Voltage VEN Rising 0.3 0.4 0.5 V
EN Hysteresis 30 mV
EN Pin Pull-Up Current EN=GND 10
TSS Soft-Start Interval 2 ms
POWER OK AND DELAY
POK Threshold Voltage for
POK
Power OK
POK Threshold Voltage for
Power Not OK
VFB Rising 90% 92% 94% V
VFB Falling 79% 81% 83% V
V
V
PNOK
POK Low Voltage POK sinks 5mA 0.25 0.4 V
T
POK Delay Time 1 3 10 ms
DELAY
APL5912
Min Typ Max
Unit
o
C
oC
µ
A
REF
REF
Copyright ANPEC Electronics C orp.
www.anpec.com.tw5
Rev. A.9 - Apr., 2008
APL5912
Typical Operating Characteristics
VCNTL Supply Current vs.
Junction Temperature
1.0
0.9
V
= 5V
(mA)
CNTL
0.8
0.7
CNTL
0.6
V
0.5
CNTL
= 3.3V
0.4
0.3
0.2
VCNTL Supply Current, I
0.1
0.0
-50 -25 0 25 50 75 100 125
Junction Temperature (°C)
Dropout Voltage vs. Output Current
Current-limit vs. Junction Temperature
8.6
V
=1.2V
8.4
8.2
8
(A)
LIM
7.8
7.6
7.4
Current-limit, I
7.2
7
-50 -25 0 25
OUT
V
CNTL
V
=3.3V
CNTL
75 100 125
50
Junction Temperature (°C)
Dropout Voltage vs. Output Current
=5V
250
V
=3.3V
200
V
CNTL
OUT
=1.2V
TJ=125 C
TJ=75 C
150
TJ=25 C
100
Dropout Voltage (mV)
50
TJ=-25 C
0
0 1 2 3 4 5
Output Current, l
OUT
Copyright ANPEC Electronics C orp.
Rev. A.9 - Apr., 2008
(A)
TJ=0 C
200
V
=5V
CNTL
V
=1.2V
OUT
TJ=125 C
150
TJ=75 C
100
Dropout Voltage (mV)
50
TJ=25 C
TJ=-25 C
0
0 1 2 3 4 5
Output Current, l
OUT
(A)
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TJ=0 C
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