Power APE8977MP 2.5a linear regulator Datasheet

Advanced Power
Electronics Corp.
APE8977MP
2.5A LINEAR REGULATOR
DESCRIPTIOON
FEATURES
The APE8977MP is a simple, cost-effective and
high-speed linear regulator. The regulator is capable of
actively sinking or sourcing up to 2.5A while regulating
an output voltage to within 40mV. The desired output
voltage can be programmed by two external voltage
divider resistors of the REFEN pin.
The APE8977MP also incorporates a high-speed
differential amplifier to provide ultra-fast response in
line/load transient. Other features include extremely low
initial offset voltage, excellent load regulation, current
limiting in bi-directions and on-chip thermal shut-down
protection. Built-in soft-start function avoids a misoperation by inrush current.
The APE8977MP are available in the ESOP-8
(Exposed Pad) surface mount packages.
Sink and Source up to 2.5Amp
Integrated Power MOSFETs
High Accuracy Output Voltage at Full-Load
Output Adjustment by Two External Resistors
Built-in Soft-start Function
Current Limiting Protection
On-Chip Thermal Protection
Available in ESOP-8 (Exposed Pad) Packages
VIN and VCNTL Under Voltage Protection
RoHS Compliant and 100% Lead (Pb)-Free
Halogen Free Product
APPLICATION
Desktop PCs, Notebooks, and Workstations
Graphics Card Memory Termination
Set Top Boxes, Digital TVs, Printers
Embedded Systems
Active Termination Buses
TYPICAL APPLICATION
VCNTL
VIN
VIN
CIN
VCNTL
R1
CCNTL
APE8977MP
RTT
VOUT
REFEN
VOUT
Shutdown
R2
CSS
GND
COUT
RDUMMY
Enable
R1 = R 2 = 100 K Ω , RTT = 50Ω / 33 Ω / 25 Ω
COUT = 10 uF ( + 100 uF under the worst case testing condition )
CSS = 1 uF , CIN = 470 uF (Low ESR ) , CCNTL = 47 uF
Data and specifications subject to change without notice
1
20130104V1.1
Advanced Power
Electronics Corp.
APE8977MP
(Note1)
ABSOLUTE MAXIMUM RATINGS
Input Voltage (V IN) ------------------------------------------ 6V
CNTL Pin Voltage (VCNTL) -------------------------------- 6V
Power Dissipation (P D) ------------------------------------ Internally Limited
Storage Temperature Range (T ST) --------------------- -65 to +150°C
Lead Temperature (Soldering, 10sec.) ---------------- 260°C
Thermal Resistance from Junction to Case (R thjc)
28°C/W
Note1 : Exceeding the absolute maximum rating may damage the device.
(Note2)
OPERATING RATING
Input Voltage (V IN) ------------------------------------------ 2.5V to 1.5V +3%
CNTL Pin Voltage (VCNTL) -------------------------------- 5.5V or 3.3V +5%
Junction Temperature Range (T J) ---------------------- -40 to +125°C
Ambient Temperature Range (T A) ---------------------
-40 to +85°C
Note2 : The device is not guaranteed to function outside its operating conditions.
ORDERING / PACKAGE INFORMATION
( Top View )
APE8977X
Package Type
VIN
1
8
GND
2
7 NC
REFEN
3
VOUT
4
GND
NC
6 VCNTL
5
MP : ESOP-8
NC
ESOP-8
Rthja = 75oC/W
ELECTRICAL SPECIFICATIONS
(VIN=1.8V, VCNTL=3.3V, VREFEN=0.9V, COUT=10uF(Ceramic), T A =25oC, unless otherwise specified)
Parameter
SYM
TEST CONDITION
MIN
TYP
MAX
UNITS
Input
VCNTL Operation Current
ICNTL
IOUT = 0A
-
1
2.5
mA
Standby Current
ISTBY
VREFEN= 0V (Shutdown)
-
2
5
uA
IVIN
VREFEN= 0V (Shutdown)
-
-
5
uA
VCNTL Rising
2.4
2.55
2.7
V
-
0.35
-
V
VIOP Rising
0.8
0.95
1.1
V
-
0.15
-
V
IOUT = 10mA
-20
-
20
IOUT = -10mA
-20
-
20
IOUT = 10mA ~ 2A
-20
-
20
IOUT = -10mA ~ -2A
-20
-
20
VIN Shutdown Current
UVP Function
VCNTL UVP Rising Threshold
VCOP
VCNTL UVP Hysteresis
VCHYS
VIN UVP Rising Threshold
VIOP
VIN UVP Hysteresis
VIHYS
Output (DDR / DDRII / DDRIII)
Output Offset Voltage (Note3)
Load Regulation
(Note4)
ΔVLoad
ΔVLoad
mV
2
Advanced Power
Electronics Corp.
APE8977MP
ELECTRICAL SPECIFICATIONS
Parameter
SYM
TEST CONDITION
MIN
TYP
MAX
UNITS
A
Protection
Current Limit
ILIM
VCNTL=5V, VIN=1.5V, VOUT=1.0V
2.5
-
-
Thermal Shutdown Temperature
TSD
3.3V < VCNTL < 5V
-
150
-
ΔTSD
3.3V < VCNTL < 5V
-
20
-
0.15
-
0.8
0.4
-
Thermal Shutdown Hysteresis
o
C
ENABLE and Soft-Start
REFEN Threshold
Soft-Start Interval
VEN
TSS
∆VOUT=1V
V
ms
Note3. VOS offset is the voltage measurement defined as VOUT subtracted from VREFEN.
Note4. Regulation is measured at constant junction temperature by using a 1ms(on) / 9ms(off) current pulse. Devices are tested for load regulation
in the load range from 10mA to 2A for source and -10mA to -2A for sink capability.
PIN DESCRIPTIONS
PIN SYMBOL
VIN
PIN DESCRIPTION
Power Input Voltage.
GND
Ground Pin
VOUT
Output Voltage
VCNTL
Gate Drive Voltage
REFEN
Reference Voltage Input and Chip Enable
BLOCK DIAGRAM
VCNTL
UVP
Function
VIN
OTP
Function
ENABLE
FUNCTION
REFEN
Soft-Start
Function
OCP
Function
GATE
CONTROL
LOGIC
ERROR
AMPLIFIER
VOUT
GND
3
Advanced Power
Electronics Corp.
APE8977MP
APPLICATION INFORMATION
Input Capacitor and Layout Consideration
Place the input bypass capacitor as close as possible to the APE8977MP. A low ESR
capacitor larger than 470uF is recommended for the input capacitor. Use short and wide traces to
minimize parasitic resistance and inductance.
Inappropriate layout may result in large parasitic inductance and cause undesired oscillation
between APE8977MP and the preceding powe converter.
Consideration while designs the resistance of voltage divider
Make sure the sinking current capability of pull-down NMOS if the lower resistance was
chosen so that the voltage on VREFEN is below 0.15V. In addition, the capacitor and voltage divider
form the lowpass filter. There are two reasons doing this design; one is for output voltage softstart while another is for noise immunity.
Thermal Consideration
APE8977MP regulators have internal thermal limiting circuitry designed to protect the device
during overload conditions.For continued operation, do not exceed maximum operation junction
temperature 125 oC. The power dissipation definition in device is:
P D = (VIN - VOUT) x IOUT + VIN x IQ
The maximum power dissipation depends on the thermal resistance of IC package, PCB
layout, the rate of surroundings airflow and temperature difference between junction to ambient.
The maximum power dissipation can be calculated by following formula:
P D(MAX) = ( TJ(MAX) -TA ) / Rthja
Where TJ(MAX) is the maximum operation junction temperature 125oC, TA is the ambient
temperature and the Rthja is the junction to ambient thermal resistance. The junction to ambient
thermal resistance (Rthja is layout dependent) for ESOP-8 package (Exposed Pad) is 75oC/W on
standard JEDEC 51-7 (4 layers, 2S2P) thermal test board. The maximum power dissipation at TA
= 25oC can be calculated by following formula:
P D(MAX) = (125oC - 25oC) / 75oC/W = 1.33W
The thermal resistance Rthja of ESOP-8 (Exposed Pad) is determined by the package design
and the PCB design. However, the package design has been decided. If possible, it's useful to
increase thermal performance by the PCB design. The thermal resistance can be decreased by
adding copper under the expose pad of ESOP-8 package. We have to consider the copper
couldn't stretch infinitely and avoid the tin overflow.
4
Advanced Power
Electronics Corp.
APE8977MP
TYPICAL PERFORMANCE CHARACTERISTICS
Load Transient (Source test)
Load Transient (Sink test)
VIN
VIN
VOUT
VOUT
IOUT
IOUT
VIN = 5V, VCNTL = 5V
VIN = 5V, VCNTL = 5V
VREF = 2.5V Supplied by a regulator
VREF = 2.5V Supplied by a regulator
Output Voltage vs. Temperature
1.1
Shutdown Threshold vs. Temperature
0.55
Turn On
Shutdown Threshold (V)
Output Voltage (V)
0.5
1
0.9
0.8
0.45
Turn Off
0.4
0.35
0.3
0.7
0.25
-50
-25
0
25
50
75
100
125
-50
-25
0
o
VCNTL Current (mA)
VIN Current (uA)
125
VCNTL Current vs. Temperature
4
VIN=1.8V, VCNTL=5V
VIN=1.8V, VCNTL=3.3V
VIN=1.5V, VCNTL=5V
VIN=1.5V, VCNTL=3.3V
13
100
VIN = 1.8V, VCNTL = 3.3V, IOUT = 10mA, Source test
VIN Current vs. Temperature
14
75
Temperature ( C)
VIN = 1.8V, VCNTL = 3.3V, IOUT = 0A, Source test
15
50
o
Temperature ( C)
16
25
12
11
10
9
8
3.5
VIN=1.8V, VCNTL=5V
3
2.5
VIN=1.8V, VCNTL=3.3V
2
7
6
1.5
-50
-25
0
25
50
75
o
Temperature ( C)
IOUT = 0A, Source test
100
125
-50
-25
0
25
50
75
100
125
o
Temperature ( C)
IOUT = 0A, Source test
5
Advanced Power
Electronics Corp.
APE8977MP
TYPICAL PERFORMANCE CHARACTERISTICS
5.5
Sink Current Limit (A)
Source Current Limit (A)
Sink Current Limit vs. Temperature
Source Current Limit vs. Temperature
5.5
5
4.5
5
4.5
4
3.5
VIN=1.8V, VCNTL=3.3V
VIN=1.8V, VCNTL=5V
VIN=1.8V, VCNTL=3.3V
VIN=1.8V, VCNTL=5V
3
4
-50
-25
0
25
50
75
o
Temperature ( C)
100
125
-50
-25
0
25
50
75
100
125
o
Temperature ( C)
6
Advanced Power
Electronics Corp.
APE8977MP
MARKING INFORMATION
ESOP-8
Part Number
Package Code
8977MP
YWWSSS
Date Code (YWWSSS)
Y:Last Digit Of The Year
WW:Week
SSS:Sequence
7
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