FP6111
Technology
QSWITCHING BUCK REGULATOR
GENERAL DESCRIPTION
The FP6111 is a buck IC of switching regulator for wide operating voltage application fields.
The FP6111 includes a high current P-MOSFET; high precision reference (0.8V) for comparing
output voltage with a feedback amplifier, an internal dead-time controller and soft start time.
The oscillator is for controlling the maximum duty cycle and PWM frequency.
FEATURES
˙Precision feedback reference voltage: 0.8V (2%)
˙Wide supply voltage operating range: 3.6 to 25V
˙Low current consumption: 3mA
˙Internal fixed oscillator frequency: Typ. 320KHz
˙Internal Soft-Start function (SS)
˙Built-in P-MOSFET for 2A loading capability
˙Over Current Protection
SOP8
˙Package: SOP8
TYPICAL APPLICATION
Vin
4
VCC
LX
5
LX
6
FB
1
VOUT
FP6111
3
EN
COMP
2
GND GND
7
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Rev0.2 June 29, 2009
P1/FP6111
FP6111
Technology
FUNCTIONAL BLOCK DIAGRAM
3
4
Enable
Control
Reference
Regulator
Oscillator
2.50V
Over Current
Protection
36K
1
Output drive
control circuits
0.8V
500
2
Thermal
Shutdown
Internal Soft start
circuit
7
8
5
PIN DESCRIPTION
MARK VIEW
1
8
2
7
-
4
L
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FP 61 1 1
3
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6
5
Name No.
FB
1
COMP 2
EN
3
VCC
4
5
LX
6
7
GND
8
I/O
I
O
I
P
Description
Error Amplifier Inverting Input
Error Amplifier Compensation Output
Enable Control
IC Power Supply (PMOS Source)
P
PMOS High Current Output
O
IC Ground
Rev0.2 June 29, 2009
P2/FP6111
6
FP6111
Technology
ORDER INFORMATION
Part Number
FP6111D-LF
FP6111DR-LF
Operating Temperature
-25°C ~ +85°C
-25°C ~ +85°C
Package
SOP8
SOP8
Description
Tube
Tape & Reel
IC DATE CODE DISTINGUISH
FP6111
- L
Halogen Free
Lot Number
Mass Production Version
Per Half Month
Year
FOR EXAMPLE:
January
February
March
A (Front Half Month), B (Last Half Month)
C, D
E, F
------------And so on
The printing ink of the lot number is a last two numbers of one wafer lot:
For Example:
A3311C62
Lot Number
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P3/FP6111
FP6111
Technology
ABSOLUTE MAXIMUM RATINGS
Power supply voltage ---------------------------------------------------------------------------
+25V
Output source current --------------------------------------------------------------------------
+2A
Error amplifier inverting input ---------------------------------------------------------------
-0.3V~+1.2V
Allowable dissipation
SOP8
Ta≦+25℃------------------------------------------------------------
650mW
Thermal Resistance Junction to Ambient -----------------------------------------------
175℃/W
Thermal Resistance Junction to Case --------------------------------------------------
45℃/W
Operating temperature-----------------------------------------------------------------------
-25℃～+85℃
ESD Susceptibility
HBM (Human Body Mode)------------------------------------------------------------------
2KV
MM (Machine Mode)--------------------------------------------------------------------------
200V
Storage temperature-------------------------------------------------------------------------
-55℃～+125℃
SOP8 Lead Temperature (soldering, 10 sec) -----------------------------------------
+260℃
Recommend: IR Reflow
260℃ / 10 sec
260℃
-1.2℃ / sec
+0.23℃ / sec
210℃
180℃
+3.4℃ / sec
25℃
15s
60s
190s
280s
FP6111 IR Re-flow Soldering Curve
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Rev0.2 June 29, 2009
P4/FP6111
FP6111
Technology
DC ELECTRICAL CHARACTERISTICS
Electrical characteristics over recommended operating free-air temperature range, VCC=6V, (unless
otherwise noted)
Reference
PARAMETER
SYMBOL
Output voltage
VREF
Input regulation
△VREF
Output voltage change with
temperature
△VREF /VREF
TEST CONDITIONS
MIN
COMP connected to FB 0.784
TYP
MAX.
UNIT
0.8
0.816
V
mV
VCC＝3.6 V to 25 V
-
2
12.5
TA＝-25℃ to 25℃
-
1
2
TA＝ 25℃ to 85℃
-
1
2
%
Oscillator section
PARAMETER
SYMBOL
TEST CONDITIONS
MIN.
TYP.
MAX.
UNIT
Oscillation frequency
f
0.4V <COMP < 0.7V
-
320
-
KHz
Oscillation frequency
f
COMP < 0.4V
-
30
-
KHz
Δf / ΔV
VCC=3.6V to 25V
-
5
-
%
Δf / ΔT
Ta = -25℃ to +85℃
-
5
-
%
SYMBOL
TEST CONDITIONS
MIN.
TYP.
MAX.
UNIT
Input bias current
IB
--
-1.0
-0.2
1.0
μA
Voltage Gain
Av
--
-
100
-
V/V
Frequency bandwidth
BW
Av=0 dB
-
6
-
MHz
Output voltage
Positive
VPOS
--
1.7
2
-
Swing
Negative
VNEG
--
-
0.1
0.2
-15
-30
-
μA
15
30
-
μA
Frequency change with
voltage
Frequency change with
temperature
Error Amplifier section
PARAMETER
ISOURCE
Output source current
Output sink current
ISINK
VCOMP=800mV
V
Idle Period Adjustment section
PARAMETER
Maximum duty cycle
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SYMBOL
TEST CONDITIONS
MIN.
TYP.
MAX.
UNIT
TDUTY
VFB =0.2V
-
80
-
%
Rev0.2 June 29, 2009
P5/FP6111
FP6111
Technology
DC ELECTRICAL CHARACTERISTICS (Cont.)
Output section
PARAMETER
SYMBOL
PMOS D-S voltage
VDSS
PMOS source current
ID
PMOS On resistance
RDS(ON)
Output leakage current
IL
TEST CONDITIONS
MIN.
TYP.
MAX.
UNIT
VCOMP=0.1V
-
-30
-
V
--
-
-2
-
A
VCC=5.0V, V FB=0V
-
70
150
VCC=10V, V FB =0V
-
42
90
--
-
5
-
μA
mΩ
Thermal Shutdown section
PARAMETER
SYMBOL
TEST CONDITIONS
MIN.
TYP.
MAX.
UNIT
--
--
-
150
-
℃
SYMBOL
TEST CONDITIONS
MIN.
TYP.
MAX.
UNIT
IOCP
--
-
3
-
A
SYMBOL
TEST CONDITIONS
MIN.
TYP.
MAX.
UNIT
20
uA
Thermal shutdown
temperature
Over Current Protection section
PARAMETER
PMOS OCP current
Total device section
PARAMETER
EN Input Current
IEN
EN pin open
Upper threshold voltage
VUPPER
EN pin upper
1.12
V
Lower threshold voltage
VLOW
EN pin low
0.87
V
Hysteresis
VHYS
210
250
mV
Average supply current
IAVE
-
4
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Rev0.2 June 29, 2009
P6/FP6111
mA
Technology
FP6111
TIMING WAVEFORM
3.6V
VCC
COMP
0.8V
OSC
0.4V
LX
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Rev0.2 June 29, 2009
P7/FP6111
FP6111
Technology
DETAILED DESCRIPTION
Voltage reference
A 2.5V reference regulator supplies FP6111 internal circuits and uses the resistive dividers to provide a
0.8V precision reference voltage on the non-inverting terminal of error amplifier.
Error amplifier
The error amplifier compares a sample of the dc-dc converter output voltage to the 0.8V(Vref) reference
and generates an error signal for the PWM comparator. Output voltage of dc-dc converter is setting with
the resistor divider using the following expression (see fig 1):
 R2 
Vout = 1 +
 ∗ Vref
R1 

VOUT
T
R2
Error Amplifier
1
36K
R1
0.8V
500
FP6111
2
C1
Figure 1. Error Amplifier with Feedback resistance divider
Oscillator
The fixed frequency generates from an internal RC oscillator, and the typical values are 320KHz and
30KHz.
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Rev0.2 June 29, 2009
P8/FP6111
Technology
FP6111
Thermal Protection
The thermal protection is functional due to a heavy loading drop and junction temperature achieve 150
℃, then FP6111 output turn off. When junction temperature is lower than 150 ℃, FP6111 starts again
and power switch turns on.
Over Current Protection
The FP6111 uses cycle-by-cycle current limit to protect the internal power switch. During each
switching cycle, a current limit comparator detects if the power switch current exceeds the internal
setting current, and begins over current protection decrease the oscillator frequency to prevent thermal
issue.
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Rev0.2 June 29, 2009
P9/FP6111
FP6111
Technology
APPLICATION NOTE
IC
CB2
1
NC
CB1
GND
COMP
GND
8
RB1
2
22nF
FB
7
3k
EN 3
Vcc
4
EN
VCC
LX
LX
6
Vout
5
L1
C2
C3
330uF
0.1uF
FP6111
22uH
C1
0.1uF
D1
R2
10k
SK34
R3
1k
C5
470uF
R1
3k
FP6111 Basic DC-DC Regulator Circuits
For example:
The VIN is 12V power supply and the VOUT is designed for 3.3V / 2A solution.
The output voltage formula is:
Vref=IN- Connect to FB
 R2 
 10KΩ 
VOUT = 1 +
 ∗ Vref = 1 +
 ∗ 0.8V = 3.30V
R1 
3KΩ 


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Rev0.2 June 29, 2009
P10/FP6111
C4
0.1uF
FP6111
Technology
PACKAGE OUTLINE
SOP8
0.016typ
0.015X45
H
E
0.008typ.
0.050typ
D
A
L
A1
SEATING PLANE
0.004max
SYMBOLS
MIN
MAX
A
0.053
0.069
A1
0.004
0.010
D
0.189
0.196
E
0.150
0.157
H
0.228
0.244
L
0.016
0.050
θ°
0
8
UNIT:INCH
NOTE:
1. JEDEC OUTLINE: MS-012 AA
2. DIMENSIONS “D” DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.MOLD
FLASH, PROTRUSIONS AND GATE BURRS SHALL NOT EXCEED .15mm (.0.06in) PER SIDE
3. DIMENSIONS “E” DOES NOT INCLUDE INTER-LEAD FLASH, OR PROTRUSIONS. INTER-LEAD
FLASH AND PROTRUSIONS SHALL NOT EXCEED .25mm (.0.10in) PER SIDE.
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Rev0.2 June 29, 2009
P11/FP6111
FP6111
Technology
PACKING SPECIFICATIONS
BOX DIMENSION
100mm
220mm
FTC Logo
FTC Logo
630mm
BOX
LABEL
640mm
BOX
LABEL
190mm
380mm
INSIDE BOX
TUBE CARTON
TUBE INSIDE BOX AND CARTON
380mm
362mm
365mm
342mm
FTC label
230mm
50mm
CARTON
LABEL
Tape & Reel Carton
TAPE AND REEL INSIDE BOX AND CARTON
PACKING QUANTITY SPECIFICATIONS
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FP6111D-LF SOP8
FP6111DR-LF SOP8
100 EA/TUBE
2500 EA / REEL
100 TUBES / INSIDE BOX
1 REEL / INSIDE BOX
4 INSIDE BOXES / CARTON
4 INSIDE BOXES / CARTON
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Rev0.2 June 29, 2009
P12/FP6111
FTC Logo
FP6111
Technology
CARRIER TAPE DIMENSIONS
SOP8
APPLICATION
W
12.0
SOP8
+0.3
-0.1
P
E
F
D
D1
8.0±0.1
1.75±0.1
5.5±0.1
1.55±0.1
1.5+0.25
APPLICATION
P0
P1
AD
B0
K0
T
SOP8
4.0±0.1
2.0±0.1
6.4±0.1
5.20±0.1
2.1±0.10
0.30±0.013
REEL DIMENISIONS
APPLICATION
MATERIAL
A
B
C
D
T1
T2
SOP8
PLASTIC REEL
330±0.1
62±1.5
12.75+0.15
2+0.6
12.4+0.2
2.0+0.2
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Rev0.2 June 29, 2009
P13/FP6111