fitipower integrated technology lnc.
FP6137F
3A BUS
TERMINATION REGULATOR
Description
The FP6137F linear regulator is designed to provide
the transient peaks up to 3A sourcing or sinking
capability for DDR SDRAM bus termination
application. The output voltage can track half of
input power by two external voltage divider resistors.
The FP6137F provides current limiting in both
sourcing/sinking mode and thermal shutdown
function which protects the excessive heating due to
high current and high junction temperature.
The FP6137F is available in SOP-8 (Exposed Pad)
package.
Features
● Peak 3A Source or Sink Current
● Power MOSFET Integrated
● Low Output Voltage Offset
● Built-in Soft-start
● Current Limiting Protection
● Thermal Shutdown Protection
● Adjustable Output by External Resistors
● Shutdown for Standby or Suspend Mode
● RoHS Compliant
Applications
● DDR-I, DDR-II, DDR-III ,and DDR-IIIL Bus
Termination Voltage
● SSTL-2 and SSTL-3 Termination
● Active Termination Buses
Pin Assignments
SP Package (SOP-8 Exposed Pad)
Ordering Information
FP6137F
□□□
TR: Tape/Reel
VIN
GND
REFEN
VOUT
1
2
3
4
GND
8
7
6
5
NC
NC
VCNTL
NC
C: Green
Package Type
SP: SOP-8 (Exposed Pad)
Fig
ure 1. Pin Assignment of FP6137F (Top View)
FP6137F-0.2-JUL-2011
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fitipower integrated technology lnc.
FP6137F
Typical Application Circuit
1.35V/1.5V/1.8V/2.5V
V
IN
V
CNTL
3.3V
R
U
100K
VIN
VCNTL
0.675V/0.75V/0.9V/1.25V
V
OUT
C
CNTL
47µF
FP6137F
REFEN
VOUT
C
IN
470µF
Q1
EN
R
D
100K
C
SS
1µF
GND
C
VOUT
470µF
Figure 2. Typical Application Circuit of FP6137F with EC Capacitors
1.35V/1.5V/1.8V/2.5V
V
IN
V
CNTL
3.3V
R
U
100K
*A
VIN
VCNTL
0.675V/0.75V/0.9V/1.25V
V
OUT
C
CNTL
1µF
FP6137F
REFEN
VOUT
C
IN
10µF
Q1
EN
R
D
100K
*A
C
SS
1µF
GND
C
VOUT
22µF
Note A: The recommend value of resistor is 10k~100k
Figure 3. Typical Application Circuit of FP6137F with MLCC Capacitors
Functional Pin Description
Pin Name
VIN
GND
VCNTL
REFEN
VOUT
Pin Function
Power input pin. VIN is the input power supply used to create the external reference voltage for regulating
VOUT. VIN sources current to VOUT by upper NMOS.
Common ground pin. The VOUT sinks current to GND by lower NMOS.
Power input pin. The VCNTL power supplies the internal control circuitry and gate drive voltage.
Chip enable, and input reference voltage pin.
voltage divide resistors.
The reference voltage is half of the VIN power by two external
Regulator output pin. VOUT voltage tracks the REFEN voltage and is capable of sourcing or sinking current up
to peak 3A.
FP6137F-0.2-JUL-2011
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fitipower integrated technology lnc.
FP6137F
Block Diagram
VCNTL
VIN
REFEN
Soft Start
+
Error
Amp
VOUT
-
Current Limit &
Thermal Shutdown
GND
Figure 4. Block Diagram of FP6137F
Absolute Maximum Ratings
● VIN to GND --------------------------------------------------------------------------------------- 6V
● VCNTL to GND ---------------------------------------------------------------------------------- 6V
● Power Dissipation @25°C (P
D
) SOP-8 (Exposed Pad) -------------------------------- 1.25W
● Package Thermal Resistance (θ
JA
) SOP-8 (Exposed Pad) --------------------------- 80°C/W
● Junction Temperature -------------------------------------------------------------------------- 150°C
● Storage Temperature Range ----------------------------------------------------------------- -65°C to +150°C
● Lead Temperature (Soldering, 10sec.) ----------------------------------------------------- 260°C
Note 1：Stresses beyond those listed under “Absolute Maximum Ratings" may cause permanent damage to the device.
Recommended Operating Conditions
● Input Voltage (V
IN
) ------------------------------------------------------------------------------- (1.35V,1.5V,1.8V, 2.5V)
±5%
● Input Voltage (V
CNTL
) ---------------------------------------------------------------------------- (3.3V to 5.5V)
±5%
● Operating Temperature Range (T
OPR
) ------------------------------------------------------ -40ºC to +85ºC
FP6137F-0.2-JUL-2011
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fitipower integrated technology lnc.
FP6137F
Electrical Characteristics
(V
CNTL
=3.3V, V
IN
=1.35V/1.5V/1.8V/2.5V, V
REFEN
=0.5*V
IN
, C
OUT
=10μF, T
A
=25°C, unless otherwise specified)
Parameter
INPUT
Operation Voltage Range
(DDRI /DDII/ DDR-III/ DDR-IIIL)
V
CNTL
Quiescent Current
Shutdown Current
OUTPUT VOLTAGE
Output Offset Voltage
Load Regulation (Note2)
(DDRI/DDII/DDR-III/ DDR-IIIL)
Line Regulation
PROTECTION
Soft-Start Time
Current Limit
Thermal Shutdown Temperature
(Note3)
SHUTDOWN CONTROL
Enable High Level
Shutdown Low Level
V
REF-H
V
REF-L
0.6
0.2
V
V
T
SS
I
LIM
T
SD
T
SD
Symbol
Test Conditions
Min
Typ
Max
Units
V
CNTL
I
CNTL
I
SD
No Load
V
REFEN
<0.2V
3.3
1.5
5
5.5
3.0
30
V
mA
μA
V
OS
|
V
LOAD
|
No Load , (V
REFEN
-V
OUT
)
I
OUT
= 0 to 2A
I
OUT
= 0 to -2A
VCC=3.3V to 5.5V,
No Load
-20
0
20
20
mV
mV
20
1
20
mV
400
3.0
4.0
170
Hysteresis
35
μs
A
°C
°C
Note 2：Load regulation is measured at a constant junction temperature by using a 20ms low duty cycle current pulse.
Note 3：Guarantee by design.
FP6137F-0.2-JUL-2011
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FP6137F
Typical Performance Curves
Temperature vs. Vout
0.77
0.765
0.76
VOUT(V)
Temperature vs. Vout
0.92
V
CNTL
=3.3V
V
IN
=1.5V, V
REFEN
=0.75V
0.915
0.91
VOUT(V)
V
CNTL
=3.3V
V
IN
=1.8V, V
REFEN
=0.9V
0.755
0.75
0.745
0.74
-40
-30 -20
-10
0
10
20
30
40
50
60
70
80
90
Temperature(℃ )
0.905
0.9
0.895
0.89
-40
-30
-20
-10
0
10 20 30 40
Temperature(℃ )
50
60
70
80
90
Figure 5. Temperature vs. Vout
Temperature vs. Vout
1.27
1.265
1.26
VOUT(V)
Figure 6. Temperature vs. Vout
1.4
Temperature vs. Quiescent
V
CNTL
=3.3V
V
IN
=2.5V, V
REFEN
=1.25V
Current(mA)
1.3
1.2
1.1
1
V
CNTL
=3.3V
V
IN
=1.5V, V
REFEN
=0.75V
1.255
1.25
1.245
1.24
-40
-30
-20
-10
0
10 20 30 40
Temperature(℃ )
50
60
70
80
90
0.9
-40 -30 -20 -10
0
10 20 30 40
Temperature(
℃)
50 60 70
80 90
Figure 7. Temperature vs. Vout
Temperature VS. Source Current limit
3.8
3.75
3.7
3.65
3.6
3.55
3.5
3.45
3.4
3.35
3.3
-40 -30 -20 -10 0
Source Current Limit(A)
Figure 8. Temperature vs. Quiescent Current
Temperature VS. Sink Current limit
4.5
4.45
4.4
4.35
4.3
4.25
4.2
4.15
4.1
4.05
4
-40 -30 -20 -10 0
Sink Current Limit(A)
V
CNTL
=3.3V
V
IN
=1.5V, V
REFEN
=0.75V
V
CNTL
=3.3V
V
IN
=1.5V, V
REFEN
=0.75V
10 20 30 40 50 60 70 80 90
Temperature(℃ )
10 20 30 40 50 60 70 80 90
Temperature(℃ )
Figure 9. Temperature vs. Source Current Limit
Figure 10. Temperature vs. Sink Current Limit
FP6137F-0.2-JUL-2011
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