SP6659EK1-1.5-L [SIPEX]
Switching Regulator, Current-mode, 1.3A, 1800kHz Switching Freq-Max, PDSO5, LEAD FREE, SOT-23, 5 PIN;型号: | SP6659EK1-1.5-L |
厂家: | SIPEX CORPORATION |
描述: | Switching Regulator, Current-mode, 1.3A, 1800kHz Switching Freq-Max, PDSO5, LEAD FREE, SOT-23, 5 PIN 开关 光电二极管 |
文件: | 总11页 (文件大小:203K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
®
Preliminary
SP6659
1.5MHz, 600mA Synchronous Buck Regulator
FEATURES
V
V
V
V
IN
FB
IN
OUT
■ 94% Efficiency Possible
5
4
5
4
■ 600mA Output Current at VIN = 3.6V
■ 2.5V to 5.5V Input Voltage Range
■ 1.5MHz constant frequency operation
■ No Schottky Diode Required
■ Output Voltages as low as 0.6V
■ Slope Compensated Current Mode
Operation for Excellent Line and Load
Transient Response
■ 100 % Duty Cycle in LDO Mode
■ <1µA Shutdown Current, Quiescent
Current of 300 µA
■ Over-temperature protected
■ Pin Compatible to LTC3406B
■ Offered in Low Profile TSOT-23
package
SP6659
5 Pin TSOT-23
SP6659
5 Pin TSOT-23
1
2
3
1
2
3
SW
SW
RUN
GND
RUN
GND
Adjustable
Fixed
Now Available in Lead Free Packaging
APPLICATIONS
■ Cell Phones
■ Wireless and DSL Modems
■ DSC's
■ Portable Instruments
DESCRIPTION
The SP6659 is a 600mA synchronous buck regulator using a constant frequency, current mode
architecture. The output voltage can be programmed using an external resistor divider. The 2.5V
to 5.5V input voltage range is ideal for portable applications that use a Li-Ion battery. Switching
frequency is internally set at 1.5MHz, allowing the use of small surface mount inductors and
capacitors. The internal synchronous switch increases efficiency and eliminates the need for an
external Schottky diode. The output voltage can be programmed using an external resistor
divider. Low output voltages are easily supported with the 0.6V feedback reference voltage. The
SP6659 is available in a low profile 5 pin TSOT-23 package.
TYPICAL APPLICATION SCHEMATICS
®
®
2.2µH
2.2µH
SW
V
SW
V
3
4
1
SP6659
V
V
V
3
OUT
V
4
1
IN
OUT
IN
Cf
SP6659
100pF
R1
R2
RUN
RUN
4.7µF
Ceramic
10µF
Ceramic
4.7µF
Ceramic
10µF
Ceramic
OUT
5
FB
5
2
2
GND
GND
Adjustable
Fixed
Date: 08/15/05
SP6659 1.5MHz, 600mA Synchronous Buck Regulator
© Copyright 2005 Sipex Corporation
1
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the
specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.
Input Supply Voltage ......................................................... -0.3V to +6V
RUN, VFBVoltages .................................................. -0.3V to (VIN + 0.3V)
SW Voltage ............................................................ -0.3V to (VIN + 0.3V)
P-Channel Switch Source Current (DC) ..................................... 800mA
N-Channel Switch Sink Current (DC) ......................................... 800mA
Peak Switch Sink and Source Current ........................................... 1.3A
Operating Temperature ................................................. -40°C to +85°C
Storage Temperature ................................................. -65°C to +150 °C
Junction Temperature (Note 1) .................................................. 125 °C
Lead Temperature (Soldering, 10 sec) ....................................... 300 °C
ELECTRICAL CHARACTERISTICS
___________________________ THERMAL
RESISTANCE
Thermal Resistance is specified with approximately 1 square inch of 1 ounce copper.
OJA ................................................................220°C/W
OJC ...............................................................110°C/W
V
IN = VRUN = 3.6V, Io = 0mA, TAMB = -40ºC to +85ºC, typical values at 25ºC unless otherwise noted.
The ♦ denotes the specifications which apply over the full operating temperature range, unless otherwise specified.
PARAMETER
Input Voltage Range
Input DC Supply Current
Active Mode
MIN
TYP
MAX
UNITS
CONDITIONS
♦
2.5
5.5
V
300
0.1
400
1
µA
µA
V
V
FB = 0.5V, VIN = VRUN
Shutdown Mode
IN = 3.6V, VRUN = ZeroV
0.5880 0.6000 0.6120
0.5865 0.6000 0.6135
0.5820 0.6000 0.6180
T
A
= +25ºC
0ºC < T < +85ºC
-40ºC < T < +85ºC
V
FB (Feedback Voltage)
V
A
♦
A
V
V
V
FB Input Bias Current
FB Line Regulation
FB Load Regulation
85
300
1
nA
%/V
%/mA
V
V
V
FB = 1.0V
IN = 2.5V to 5.5V
♦
♦
♦
♦
-1
-0.1
1.455
1.746
0.6
0.4
0.01
1.500
1.800
0.1
ILOAD = 0mA to 600mA
1.545
1.854
SP6659EK1-1.5, -40ºC < T
SP6659EK1-1.8, -40ºC < T
A
A
< +85ºC
< +85ºC
Regulated Output Voltage
V
Minimum Output Voltage
Peak inductor current
Oscillator frequency
V
0.7
1.0
1.4
0.4
0.4
1.2
1.8
0.6
0.6
A
VFB = 0.5V, VIN = 2.5V
♦
0.8
mHz
Ω
Closed Loop, ILOAD = 100mA
ISW = 100mA
P-channel ON resistance
N-channel ON resistance
Ω
ISW = -100mA
V
IN = 3.6V, VRUN = ZeroV,
SW Leakage Current
0.01
1.0
µA
Vsw = ZeroV, Vsw = VIN
♦
♦
Run Threshold Voltage
Run Leakage Current
0.2
1
1.3
1.5
V
0.01
µA
Note 1: Junction Temperature TJ is calculated from the ambient temperature TA and ower dissipation PD
according to the following formula: TJ = TA + PD X 220°C/W
PIN DESCRIPTION
PIN #
PIN NAME
DESCRIPTION
Power down control pin. Forcing this pin above 1.5V enables the device. Forcing this
pin below 0.3V shuts down the device.
1
RUN
2
3
4
GND
SW
VIN
Ground pin.
Switching node.
Power supply pin
Adjustable Version: VFB, Feedback Input Pin. Connect FB to the center point of the
external resistor divider. The feedback threshold voltage is 0.6V.
5
VFB/ VOUT
Fixed Output Version: VOUT, Output Voltage Feedback Pin. An internal resistive
divider drops the output voltage down for comparison to the internal reference voltage.
Date: 08/15/05
SP6659 1.5MHz, 600mA Synchronous Buck Regulator
© Copyright 2005 Sipex Corporation
2
TYPICAL PERFORMANCE CHARACTERISTICS
Refer to the typical application schematic, VOUT = 1.8V, TAMB= +27°C
20µS/div
20µS/div
Figure 1: Load Transient 0mA to 600mA
CH 1: Output Voltage, 100mV per division AC-Coupled
CH 3: Load Current, 500mA/ div
Figure 2: Load Transient 50mA to 600mA
CH 1: Output Voltage, 100mV per division AC-Coupled
CH 3: Load Current, 500mA/ div
CH 4: Inductor Current, 500mA/ div
CH 4: Inductor Current, 500mA/ div
20µS/div
20µS/div
Figure 3: Load Transient 100mA to 600mA
CH 1: Output Voltage, 100mV per division AC-Coupled
CH 3: Load Current, 500mA/ div
Figure 4: Load Transient 200mA to 600mA
CH 1: Output Voltage, 100mV per division AC-Coupled
CH 3: Load Current, 500mA/ div
CH 4: Inductor Current, 500mA/ div
CH 4: Inductor Current, 500mA/ div
1µS/div
40µS/div
Figure 5: Discontinuous Mode
Figure 6: Startup from Shutdown
CH 1: RUN pin 2V/div.
CH 2: Vout 1V/div, AC-Coupled
CH 3: Inductor Current, 500mA/ div
CH 1: Output Voltage, 10mV per division AC-Coupled
CH 2: SW 2V/div
CH 3: Inductor Current, 500mA/ div
Date: 08/15/05
SP6659 1.5MHz, 600mA Synchronous Buck Regulator
© Copyright 2005 Sipex Corporation
3
TYPICAL PERFORMANCE CHARACTERISTICS
Refer to the typical application schematic, VOUT = 1.8V, TAMB= +27°C
1.8Vout Load Regulation
1.8Vout Efficiency Vs Output
1.830
1.820
1.810
1.800
1.790
100
90
Vin=4.2V
Vin=3.3V
Vin=2.7V
80
70
60
50
Vin=2.7V
Vin=3.3V
Vin=4.2 V
40
0
100
200
300
400
500
600
700
1
10
100
1000
Output Current (mA)
Output Current (mA)
Figure 8: Load Regulation Vout =1.8V
Figure 7: Efficiency Vs. Load Current, Vout =1.8V
1.8Vout Efficiency vs Input voltage
Output Voltage vs Load Current
100
1.850
95
90
85
80
75
70
1.840
Vin=3.3V
1.830
1.820
1.810
1.800
1.790
1.780
1.770
1.760
1.750
65
Iout=600mA
60
Iout=100mA
55
Iout=10mA
50
2
3
4
5
6
0
200
400
600
800
1000
1200
Input Voltage (V)
Input Voltage (V)
Figure 9: 1.8Vout Efficiency vs. Input Voltage
Figure 10: Output Voltage vs. Load Current
Supply Current vs Supply Voltage
Oscillator Frequency vs Supply Voltage
400
1.6
380
360
340
320
1.5
1.4
300
280
260
Vo=1.8V
Iload=600mA
1.3
Vo=1.8V
Iload=0A
240
220
1.2
200
2
3
4
5
6
2
3
4
5
6
Input Voltage (V)
Input Voltage (V)
Figure 12: Oscillator Frequency vs. Supply Voltage
Figure 11: Supply Current vs. Supply Voltage
Date: 08/15/05
SP6659 1.5MHz, 600mA Synchronous Buck Regulator
© Copyright 2005 Sipex Corporation
4
TYPICAL PERFORMANCE CHARACTERISTICS
Refer to the typical application schematic, VOUT = 1.8V, TAMB= +27°C
2.5Vout Efficiency Vs Output Current
2.5Vout Load Regulation
100
90
80
70
60
50
40
2.520
2.510
2.500
2.490
2.480
Vin=4.2V
Vin=3.3V
Vin=2.7V
Vin=2.7V
Vin=3.3V
Vin=4.2V
0
100
200
300
400
500
600
700
1
10
100
1000
Output Current (mA)
Output Current (mA)
Figure 14: Load Regulation Vout =2.5V
Figure 13: Efficiency Vs. Load Current, Vout =2.5V
1.5Vout Load Regulation
1.5Vout Efficiency Vs Output Current
1.520
100
Vin=4.2V
Vin=3.3V
Vin=2.7V
90
80
70
1.510
1.500
1.490
1.480
60
Vin=2.7V
Vin=3.3V
Vin=4.2V
50
40
0
100
200
300
400
500
600
700
1
10
100
1000
Output Current (mA)
Output Current (mA)
Figure 16: Load Regulation Vout =1.5V
Figure 15: Efficiency Vs. Load Current, Vout =1.5V
1.2Vout Efficiency Vs Output Current
1.2Vout Load Regulation
1.230
100
Vin=4.2V
Vin=3.3V
Vin=2.7V
90
80
70
1.220
1.210
1.200
1.190
60
Vin=2.7V
Vin=3.3V
Vin=4.2V
50
40
0
100
200
300
400
500
600
700
1
10
100
1000
Output Current (mA)
Output Current (mA)
Figure 17: Efficiency Vs. Load Current, Vout =1.2V
Figure 18: Load Regulation Vout =1.2V
Date: 08/15/05
SP6659 1.5MHz, 600mA Synchronous Buck Regulator
© Copyright 2005 Sipex Corporation
5
FUNCTIONAL DIAGRAMS
V
IN
SLOPE
COMP
OSC
4
2.7 - 5.5V
+
-
CIN
+
SENSE
COMP
-
BLANKING
I
R
_
S
_
Q
_
Q
+
VOUT
R
0.6V
+
EA
-
COMP
-
RS LATCH
SW
5
VOUT
PWM
LOGIC
DRV
3
R1
+
OV
DET
-
0.65V
R2
COUT
+
V
IN
Izero
COMP
-
2
RUN
GND
0.6V
REF
1
SHUTDOWN
Fixed Output Version
V
IN
SLOPE
COMP
OSC
4
2.7 - 5.5V
+
-
C
IN
+
SENSE
COMP
-
BLANKING
I
R
_
S
_
Q
_
Q
+
R
V
FB
0.6V
+
COMP
-
EA
RS LATCH
SW
5
-
V
OUT
PWM
LOGIC
DRV
3
2
+
OV
DET
-
Cf
R1
0.65V
COUT
+
R2
VIN
Izero
COMP
-
RUN
GND
0.6V
REF
1
SHUTDOWN
Adjustable Output Version
Date: 08/15/05
SP6659 1.5MHz, 600mA Synchronous Buck Regulator
© Copyright 2005 Sipex Corporation
6
APPLICATION INFORMATION
V
OUT
®
R1
A resistive divider based on the following
equation determines the output voltage:
V
FB
SP6659
R2
R1
R2
GND
V
OUT = 0.6 (1+
)
The external resistive divider is connected
to the output as shown in Figure 20 .
Figure 20: Setting the SP6659 Output Voltage.
THEORY OF OPERATION
The SP6659 is a monolithic switching mode
Step-Down DC-DC converter. It utilizes in-
ternal MOSFETs to achieve high efficiency
and can generate very low output voltage
by using its internal reference at 0.6V. It
operates at a fixed switching frequency,
andusesslopecompensated,current-mode
architecture. This Step-Down DC-DC con-
verter supplies 600mA of output current at
VIN = 3V. The entire input voltage range is
from 2.5V to 5.5V.
on immediately and stay on until either the
inductor current starts to reverse, as indi-
cated by the current reversal comparator,
IZERO, or the beginning of the next clock
cycle. The OVDET comparator controls
output transient overshoots by turning the
main switch off and keeping it off until the
fault is no longer present.
_______________________ IDLE MODE
OPERATION
__________________ CURRENT MODE
PWM CONTROL
At very light loads, the SP6659 automati-
cally enters Idle Mode (Figure 21).
Slope compensated current mode PWM
control provides stable switching and cycle-
by-cycle current limit for excellent load and
line responses and protection of the internal
main switch (P-Channel MOSFET) as well
as the synchronous rectifier (N-Channel
MOSFET). During normal operation, the in-
ternal P-Channel MOSFET is turned on for
a certain time to ramp the inductor current at
each rising edge of the internal oscillator,
and switched off when the peak inductor
current is above the error voltage. The
current comparator, ICOMP, limits the peak
inductor current. When the main switch is
off, the synchronous rectifier will be turned
Figure 21. SP6659 Idle Mode Operation
Date: 08/15/05
SP6659 1.5MHz, 600mA Synchronous Buck Regulator
© Copyright 2005 Sipex Corporation
7
THEORY OF OPERATION
In the Idle Mode, the inductor current may
reach zero Amps or reverse on each pulse.
The PWM control loop will automatically
skip pulses to maintain output regulation.
The bottom MOSFET is turned off by the
current reversal comparator, IZERO, and the
switch voltage will ring. This is discontinu-
ous mode operation, and is normal behavior
for the switching regulator.
________________________ MAXIMUM
LOAD CURRENT
The SP6659 will operate with an input sup-
ply voltage as low as 2.5V, however, the
maximum load current decreases at lower
inputs due to a large IR drop on the main
switch and synchronous rectifier. The slope
compensation signal reduces the peak in-
ductor current as a function of the duty cycle
to prevent sub-harmonic oscillations at duty
cycles greater than 50%. Conversely, the
current limit increases as the duty cycle
decreases.
_______________________ DROPOUT
OPERATION
When the input voltage decreases toward
the value of the output voltage, the SP6659
allowsthemainswitchtoremainonformore
than one switching cycle and increases the
duty cycle until it reaches 100%.
_______________________ INDUCTOR
SELECTION
Formostdesigns,theSP6659operateswith
inductors of 1µH to 4.7µH. Low inductance
values are physically smaller but require
faster switching, which can result in some
efficiency loss. The inductor value can be
derived from the following equation:
The duty cycle D of a step-down converter is
defined as:
D = TON X ƒOSC X 100%
≈ VOUT
X 100%
VIN
L = VOUT X (VINMax - VOUT)
VINMax X ∆IL X ƒOSC
where TON is the main switch on time, and
ƒOSC is the oscillator frequency (1.5Mhz).
Where ∆IL is the inductor Ripple Current.
Large value inductors lower ripple current
and small value inductors result in higher
ripple current. Choose inductors at ripple
current of approximately 35% of the maxi-
mum load current 600mA, or ~ 210mA.
The output voltage then is the input voltage
minus the voltage drop across the main
switch and the inductor. At low input supply
voltage, the RDSON of the P-Channel
MOSFET increases, and the efficiency of
the converter decreases. Caution must be
exercised to ensure that the heat dissipated
doesnotexceedthemaximumjunctiontem-
perature of the IC.
For output voltages above 2.0V, when light-
load efficiency is important, the minimum
recommended inductor is 2.2µH. For opti-
mum voltage-positioning load transients,
Date: 08/15/05
SP6659 1.5MHz, 600mA Synchronous Buck Regulator
© Copyright 2005 Sipex Corporation
8
THEORY OF OPERATION
choose an inductor with DC series resis-
tance in the 50mΩ to 150mΩ range. For
higher efficiency at heavy loads (above
200mA), or minimal load regulation (but
some transient overshoot), the resistance
should be kept below 100mΩ. The DC cur-
rent rating of the inductor should be at least
equal to the maximum load current plus half
the ripple current to prevent core saturation
(600mA+105mA).
________________ INPUT CAPACITOR
SELECTION
The input capacitor reduces the surge cur-
rent drawn from the input and switching
noise from the device. The input capacitor
impedance at the switching frequency shall
be less than input source impedance to
prevent high frequency switching current
frompassingtotheinput.AlowESR(Equiva-
lentSeriesResistance) inputcapacitorsized
for maximum RMS current must be used.
Ceramic capacitors with X5R or X7R dielec-
trics are highly recommended because of
their low ESR and small temperature coeffi-
cients. A 4.7µF ceramic capacitor for most
applications is sufficient.
Table 1 lists some typical surface mount
inductors that meet target applications for
the SP6659.
SP6659 Inductor Selection Chart
Part #
Inductor Max DCR Rated DC Size WxLxH
______________ OUTPUT CAPACITOR
SELECTION
(µH)
(mΩ)
Current
(Amps)
(mm)
Murata
LQH32CN2R2M11
1.0
78
1000
3.2x2.5x1.55
The output capacitor is required to keep the
output voltage ripple small and to ensure
regulation loop stability. The output capaci-
tor must have low impedance at the switch-
ing frequency. Ceramic capacitors with X5R
or X7R dielectrics are recommended due to
their low ESR and high ripple current. The
output ripple ∆VOUT is determined by:
Murata
LQH32CN2R2M11
2.2
126
790
3.2x2.5x1.55
Murata
4.7
195
650
3.2x2.5x1.55
LQH32CN4R7M11
1.4
2.2
3.3
4.7
1.5
2.2
3.3
4.7
1.5
2.2
3.3
4.7
56.2
71.2
86.2
2.52
1.5
1.44
1.15
Sumida CR43
4.5x4.0x3.5
4.7x4.7x2.0
3.6x3.6x1.2
108.7
75
1.32
1.04
0.84
1.29
1.14
0.98
0.79
Sumida CDRH4D18
Toko D312C
110
162
120
140
180
240
∆VOUT
≤
Inductor in Bold is used on the SP6659EB evaluation Board
1
VOUT X (VINMax - VOUT
) X
+
ESR
{
}
(8X ƒOSC X COU
)
T
VINMax X L X ƒOSC
Table 1: Typical Surface Mount Inductors
Date: 08/15/05
SP6659 1.5MHz, 600mA Synchronous Buck Regulator
© Copyright 2005 Sipex Corporation
9
PACKAGE: 5 PIN TSOT23
D
e1
5
4
SIDE VIEW
A2
E/2
E1/2
E
E1
A
Seating
Plane
A1
2
3
1
(L1)
Pin1 Designator
to be within this
INDEX AREA
e
b
TOP VIEW
ø1
FRONT VIEW
R1
Gauge Plane
R
L2
ø1
c
Seating
Plane
ø
L
5 Pin TSOT-23
JEDEC MO-193
Variation AB
Dimensions in Inches
Conversion Factor:
1 Inch = 25.40 mm
Dimensions in Millimeters:
Controlling Dimension
SYMBOL
MIN
-
0.00
0.70
0.08
NOM
-
-
0.90
-
MAX
1.10
0.10
1.00
0.20
MIN
-
0.000
0.028 0.036
0.003
NOM
-
-
MAX
0.043
0.004
0.039
0.008
A
A1
A2
c
-
D
E
E1
L
2.90 BSC
2.80 BSC
1.60 BSC
0.45
0.114 BSC
0.110 BSC
0.063 BSC
0.30
0.60
0.012 0.018
0.024
L1
L2
Ø
Ø1
R
0.60 REF
0.25 BSC
4º
10º
-
0.024 REF
0.010 BSC
4º
10º
0˚
4˚
0.10
0.10
0.30
8º
12º
-
0.25
0.50
0º
4º
0.004
0.004
0.012
8º
12º
-
-
R1
-
-
-
-
0.010
0.020
b
e
e1
0.95 BSC
1.90 BSC
0.038 BSC
0.075 BSC
SIPEX Pkg Signoff Date/Rev:
JL Aug4-05 / Rev A
Date: 08/15/05
SP6659 1.5MHz, 600mA Synchronous Buck Regulator
© Copyright 2005 Sipex Corporation
10
ORDERING INFORMATION
Package Type
Part Number
Operating Temperature Range
SP6659EK1 ......... ...............................-40°C to +85°C ...........................................................5 Pin TSOT23
SP6659EK1/TR ...................................-40°C to +85°C ...........................................................5 Pin TSOT23
SP6659EK1-1.5 ...................................-40°C to +85°C ...........................................................5 Pin TSOT23
SP6659EK1-1.5/TR...............................-40°C to +85°C ..........................................................5 Pin TSOT23
SP6659EK1-1.8 ...................................-40°C to +85°C ...........................................................5 Pin TSOT23
SP6659EK1-1.8/TR...............................-40°C to +85°C ..........................................................5 Pin TSOT23
Available in lead free packaging. To order add "-L" suffix to part number.
Example: SP6659EK1/TR = standard; SP6659EK1-L/TR = lead free
/TR = Tape and Reel
Pack quantity is 2,500 for TSOT23.
Corporation
ANALOG EXCELLENCE
Sipex Corporation
Headquarters and
Sales Office
233 South Hillview Drive
Milpitas, CA 95035
TEL: (408) 934-7500
FAX: (408) 935-7600
Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the
application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others.
Date: 08/15/05
SP6659 1.5MHz, 600mA Synchronous Buck Regulator
© Copyright 2005 Sipex Corporation
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