SP6120B
Low Voltage, AnyFET
TM
, Synchronous ,Buck Controller
Ideal for 2A to 10A, High Performance, DC-DC Power Converters
■
Optimized for Single Supply, 3V - 5.5V Applications
■
High Efficiency: Greater Than 95% Possible
■
"AnyFET
TM"
Technology: Capable of Switching Either
PFET or NFET High Side Switch
■
Selectable Discontinuous or Continuous Conduction
Mode
■
Fast Transient Response from Window Comparator
■
Accurate 1% Reference Over Line, Load and Temperature
■
Accurate 10% Frequency
■
Accurate, Rail to Rail, 43mV, Over-Current Sensing
■
Resistor Programmable Frequency and Output Voltage
■
Low Quiescent Current: 950µA, 10µA in Shutdown
■
Hiccup Over-Current Protection
■
Capacitor Programmable Soft Start
■
Guaranteed Boost Voltage to Enhance High Side NFET
■
Available in Lead Free, RoHS Compliant Package:
16-Pin TSSOP, Small Size
N/C 1
ENABLE 2
ISP 3
ISN 4
V
FB
5
COMP 6
SS 7
R
OSC
8
16 BST
15 GH
SP6120B
16 Pin TSSOP
14 SWN
13 GND
12 PGND
11 GL
10 V
CC
9 PROG
APPLICATIONS
■
■
■
■
■
■
DSP
Microprocessor Core
I/O & Logic
Industrial Control
Distributed Power
Low Voltage Power
DESCRIPTION
The SP6120B is a fixed frequency, voltage mode, synchronous PWM controller designed to
work from a single 5V or 3.3V input supply. Sipex's unique "AnyFET
TM"
Technology allows
the SP6120B to be used for resolving a multitude of price/performance trade-offs. It is
separated from the PWM controller market by being the first controller to offer precision,
speed, flexibility, protection and efficiency over a wide range of operating conditions.
NMOS High Side Drive
PROG = GND
NC
ENABLE
ENABLE
ISP
ISN
V
FB
COMP
RZ
15k
CP
100pF
CZ
4.7nF
C
SS
0.33µF
SS
R
OSC
R
OSC
18.7k
®
MBR0530
C
B
1µF
QT
3.3V
V
IN
C
IN
330µF x 2
CS
39nF
1.9V
1A to 8A
V
OUT
PMOS High Side Drive
PROG = V
CC
NC
ENABLE
ENABLE
ISP
ISN
®
3.3V
V
IN
C
IN
330µF x 2
QT1
RS
22.1k
L1
2.5µH
CS
39nF
1.9V
1A to 8A
V
OUT
BST
GH
SWN
GND
C
BST
1µF
BST
GH
SWN
GND
RS
22.1k
L1
2.5µH
SP6120B
SP6120B
PGND
GL
V
CC
PROG
CV
CC
2.2µF
RI
10k
V
IN
QB
DS
C
OUT
470µF x 3
V
FB
COMP
RZ
15k
CP
100pF
CZ
4.7nF
C
SS
0.33µF
SS
R
OSC
R
OSC
18.7k
PGND
GL
V
CC
PROG
CV
CC
2.2µF
RI
10k
V
IN
QB
DS
C
OUT
470µF x 3
RF
5.23k
RF
5.23k
QT, QB = FAIRCHILD FDS6690A
QT1 = FAIRCHILD FDS6375 (PMOS only)
L1 = PANASONIC ETQP6F2R5SFA
Jun21-07 Rev B
DS = STMICROELECTRONICS STPS2L25U
C
IN
= SANYO 6TPB330M
C
OUT
= SANYO 4TPB470M
© 2007 Sipex Corporation
SP6120B Low Voltage, AnyFET
TM
, Synchronous, Buck Controller
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.
V
CC
............................................................................... 7V
BST ........................................................................ 13.2V
BST-SWN .................................................................... 7V
SWN .................................................................. -1V to 7V
GH ..................................................... -0.3V to BST +0.3V
GH-SWN ..................................................................... 7V
All Other Pins ....................................... -0.3V to V
CC
+0.3V
Peak Output Current < 10µs
GH, GL ........................................................................ 2A
Operating Temperature Range
SP6120C ................................................ 0°C to +70°C
SP6120E .............................................. -40°C to +85°C
Junction Temperature, T
J
...................................... +125°C
Storage Temperature Range .................. -65˚C to +150˚C
Power Dissipation
Lead Temperature (soldering 10 sec) ................... +300˚C
ESD Rating ........................................................ 2kV HBM
ELECTRICAL CHARACTERISTICS
Unless otherwise specified: 3.0V < V
CC
<5.5V, 3.0V < BST < 13.2V, R
OSC
= 18.7kΩ, C
COMP
= 0.1µF, C
SS
= 0.1µF, ENABLE =
3V, CGH = CGL = 3.3nF, V
FB
= 1.25V, ISP = ISN = 1.25V, SWN = GND = PGND = 0V, -40°C < T
AMB
<85°C (Note 1)
PARAMETER
QUIESCENT CURRENT
V
CC
Supply Current
V
CC
Supply Current (Disabled)
BST Supply Current
ERROR AMPLIFIER
Error Amplifier Transconductance
COMP Sink Current
COMP Source Current
COMP Output Impedence
V
FB
Input Bias Current
REFERENCE
Error Amplifier Reference
V
FB
3% Low Comparator
V
FB
3% High Comparator
OSCILLATOR & DELAY PATH
Oscillator Frequency
Oscillator Frequency #2
Duty Ratio
R
OSC
Voltage
Minimum GH Pulse Width
CONDITIONS
MIN
TYP
MAX
UNITS
No Switching
ENABLE = 0V
No Switching, V
BST
= V
CC
No Switching, V
CC
= 5V, V
BST
= 10V
-
-
-
-
0.95
5
1
100
1.8
20
20
150
mA
µA
µA
µA
µs
600
V
FB
= 1.35V, COMP = 0.5V, No Faults
V
FB
= 1.15V, COMP = 1.6V
15
15
35
35
3
-
60
100
65
65
µA
µA
MΩ
nA
Trimmed with Error Amp in Unity Gain
1.238
1.250
3
3
1.262
V
%V
REF
%V
REF
270
R
OSC
= 10.2kΩ
Loop In Control -100% DC possible
Information Only - Moves
with Oscillator Trim
V
CC
> 4.5V, Ramp up COMP
Voltage > 0.6V until GH starts
Switching
450
300
500
95
0.65
120
330
550
kHz
kHz
%
V
250
ns
Jun21-07 Rev B
SP6120B Low Voltage, AnyFET
TM
, Synchronous, Buck Controller
© 2007 Sipex Corporation
2
ELECTRICAL CHARACTERISTICS
Unless otherwise specified: 3.0V < V
CC
<5.5V, 3.0V < BST < 13.2V, R
OSC
= 18.7kΩ, C
COMP
= 0.1µF, C
SS
= 0.1µF, ENABLE =
3V, CGH = CGL = 3.3nF, V
FB
= 1.25V, ISP = ISN = 1.25V, SWN = GND = PGND = 0V, -40°C < T
AMB
<85°C (Note 1)
PARAMETER
SOFTSTART
SS Charge Current
SS Discharge Current
COMP Discharge Current
COMP Clamp Voltage
SS Ok Threshold
SS Fault Reset
SS Clamp Voltage
CONDITIONS
MIN
TYP
MAX
UNITS
V
SS
= 1.5V
V
SS
= 1.5V
V
COMP
= 0.5V, Fault Initiated
V
FB
< 1.0V, VSS = 2.5V
25
2
200
2.0
1.7
0.2
2.0
50
5
500
2.4
2.0
0.25
2.4
70
7
-
2.8
2.2
0.3
2.8
µA
µA
µA
V
V
V
V
OVER CURRENT & ZERO CURRENT COMPARATORS
Over Current Comparator
Threshold Voltage
ISN, ISP Input Bias Current
Zero Current Comparator
Threshold
UVLO
V
CC
Start Threshold
V
CC
Stop Threshold
ENABLE
Enable Threshold
ON
OFF
Enable Pin Source Current
GATE DRIVER
GH Rise Time
GH Fall Time
GL Rise Time
GL Fall Time
GH to GL Non-Overlap Time
GL to GH Non-Overlap Time
V
BST
OK Threshold
Forced GL ON
V
CC
> 4.5V
V
CC
> 4.5V
V
CC
> 4.5V
V
CC
> 4.5V
V
CC
> 4.5V
V
CC
> 4.5V
V
CC
= 3.0V, FB=1.15V, Search GL High
V
CC
= 5.5V, FB=1.15V, Search GL High
V
BST
< V
BST
OK Threshold, FB =1.15V
-
-
-
-
0
0
4.0
7.3
200
40
40
40
40
60
60
4.8
7.8
350
110
110
110
110
140
140
5.0
8.3
650
ns
ns
ns
ns
ns
ns
V
V
ns
1.45
0.65
0.6
4
9
V
µA
2.75
2.65
2.85
2.75
2.95
2.9
V
V
VISP - VISN
Rail to Rail Common Mode Input
32
-
43
60
2
54
250
mV
nA
mV
Note 1:
Specifications to -40°C are guaranteed by design, characterization and correlation with statistical process control.
Jun21-07 Rev B
SP6120B Low Voltage, AnyFET
TM
, Synchronous, Buck Controller
© 2007 Sipex Corporation
3
PIN DESCRIPTION
NAME
1
2
3
4
5
FUNCTION
N/C
ENABLE
ISP
ISN
V
FB
PIN NUMBER
No Connection
TTL compatible input with internal 4uA pullup. Floating or Venable> 1.5V will
enable the part, Venable < 0.65V disables part.
Current Sense Positive Input: Rail to Rail Input for Over-Current Detection,
43mV threshold with 10µs (typ) response time.
Current Sense Negative Input: Rail to Rail input for Over-Current Detection.
Feedback Voltage Pin: Inverting input of the error amplifier and serves as the
output voltage feedback point for the buck converter. The output voltage is
sensed and can be adjusted through an external resistor divider.
Error Amplifier Compensation Pin: A lead lag network is typically connected
to this pin to compensate the feedback loop. This pin is clamped by the SS
voltage and is limited to 2.8V maximum.
Soft Start Programming Pin: This pin sources 50µA on start-up. A 0.01µF to
1µF capacitor on this pin is typically enough capacitance to soft start a power
supply. In addition, hiccup mode timing is controlled by this pin through the
5µA discharge current. The SS voltage is clamped to 2.7V maximum.
Frequency Programming Pin: A resistor to ground is used to program
frequency. Typical values - 18,700Ω, 300kHz; 10,200Ω, 500kHz.
Programming Pin:
PROG = GND; MODE = NFET/CONTINOUS
PROG = 68kΩ to GND; MODE = NFET/DISCONTINOUS
PROG = VCC; MODE = PFET/CONTINOUS
PROG = 68kΩ to VCC; MODE = PFET/DISCONTINOUS
I.C. Supply Pin: ESD structures also hooked to this pin. Properly bypass this
pin to PGND with a low ESL/ESR ceramic capacitor.
Synchronous FET Driver: 1nF/20ns typical drive capability.
Power Ground Pin: Used for Power Stage. Connect Directly to GND at I.C.
pins for optimal performance.
Ground Pin: Main ground pin for I.C.
Switch Node Reference: High side MOSFET driver reference. Can also be
tied to GND for low voltage applications.
HIgh Side MOSFET Driver: Can be NFET or PFET depending on Program
Mode. 1nF/20ns typical drive capability. Maximum voltage rating is
referenced to SWN.
High Side Driver Supply Pin. When V
BST
is less than V
BST
OK Threshold, GL
is forced to turn on for at least 300ns. This is intended for enough time to
charge the BST capacitor.
6
COMP
7
SS
8
9
R
OSC
PROG
10
11
12
13
14
15
V
CC
GL
PGND
GND
SWN
GH
16
BST
Jun21-07 Rev B
SP6120B Low Voltage, AnyFET
TM
, Synchronous, Buck Controller
© 2007 Sipex Corporation
4
BLOCK DIAGRAM
SS
2V
+
-
V
FB
3% Low ENABLE
V
FB
3%
+ -
-
+
-
+
RESET
Dominant
Window
Comparator
Logic
ON 100%
Continuous/
Discontinuous
NFET/PFET
OFF 100%
Program
Logic
9 PROG
ENABLE 2
Reference
1.25V
3%
- +
V
FB
GND 13
SS
V
FB
5
16 BST
GM
Error Amplifier
+
-
-
+
PWM Latch
R
Q
S
QPWM
Driver
Logic
15 GH
Synchronous
Driver
14 SWN
11 GL
COMP 6
V
CC
10
0.65V
12 PGND
8 R
OSC
I
CHARGE
-
2.85 V
ON
2.75 V
OFF
ISP 3
ISN 4
UVLO
1V RAMP
F (kHz) = 5.7E6/R
OSC
(Ω)
Set Dominant
Fault Latch
S
+
OVC
+
x 10
+
10µs
430mV
Q FAULT
R
-
Soft Start
& Hiccup Logic
T
OFF
-
-
+
-
+
Zero crossing detect
250mV
7
SS
APPLICATION SCHEMATIC
NMOS High Side Drive
PROG = GND
NC
ENABLE
ENABLE
ISP
ISN
V
FB
COMP
RZ
15k
CP
100pF
CZ
4.7nF
C
SS
0.33µF
SS
R
OSC
R
OSC
18.7k
®
MBR0530
C
B
1µF
QT
3.3V
V
IN
C
IN
330µF x 2
CS
39nF
1.9V
1A to 8A
V
OUT
BST
GH
SWN
GND
C
BST
1µF
RS
22.1k
L1
2.5µH
SP6120B
PGND
GL
V
CC
PROG
CV
CC
2.2µF
RI
10k
V
IN
QB
DS
C
OUT
470µF x 3
RF
5.23k
Figure 1. Schematic 3.3V to 1.9V Power Supply
QT, QB = FAIRCHILD FDS6690A
L1 = PANASONIC ETQP6F2R5SFA
DS = STMICROELECTRONICS STPS2L25U
Jun21-07 Rev B
C
IN
= SANYO 6TPB330M
C
OUT
= SANYO 4TPB470M
SP6120B Low Voltage, AnyFET
TM
, Synchronous, Buck Controller
© 2007 Sipex Corporation
5
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