®
SP6120
Low Voltage, AnyFET
TM
, Synchronous,Buck Controller
Ideal for 2A to 10A, High Performance, DC-DC Power Converters
FEATURES
N/C 1
16 BST
■
Optimized for Single Supply, 3V - 5.5V Applications
15 GH
ENABLE 2
■
High Efficiency: Greater Than 95% Possible
14 SWN
ISP 3
SP6120
■
"AnyFET
TM"
Technology: Capable Of Switching Either
13 GND
ISN 4
PFET Or NFET High Side Switch
16 Pin TSSOP
12 PGND
V
FB
5
■
Selectable Discontinuous or Continuous Conduction
11 GL
COMP 6
Mode For Use In Battery Or Bus Applications
10 V
CC
SS 7
■
Fast Transient Response
9 PROG
R
OSC
8
■
16-Pin TSSOP, Small Size
■
Accurate 1% Reference Over Line, Load and Temperature
Now Available in Lead Free Packaging
■
Accurate 10% Frequency
APPLICATIONS
■
Accurate, Rail to Rail, 43mV, Over-Current Sensing
■
DSP
■
Resistor Programmable Frequency
■
Microprocessor Core
■
Resistor Programmable Output Voltage
■
I/O & Logic
■
Capacitor Programmable Soft Start
■
Industrial Control
■
Low Quiescent Current: 950µA, 10µA in Shutdown
■
Distributed Power
■
Hiccup Over-Current Protection
■
Low Voltage Power
DESCRIPTION
The SP6120 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 SP6120
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.
TYPICAL APPLICATIONS CIRCUIT
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
3.3V
V
IN
C
IN
330µF x 2
PMOS High Side Drive
PROG = V
CC
NC
CS
39nF
1.9V
1A to 8A
V
OUT
®
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
QT
BST
GH
SWN
GND
ENABLE
ENABLE
ISP
ISN
V
FB
RS
22.1k
L1
2.5µH
SP6120
SP6120
PGND
GL
V
CC
PROG
CV
CC
2.2µF
RI
10k
V
IN
QB
DS
C
OUT
470µF x 3
PGND
GL
V
CC
PROG
CV
CC
2.2µF
RI
10k
V
IN
QB
DS
C
OUT
470µF x 3
COMP
RZ
15k
CP
100pF
CZ
4.7nF
C
SS
0.33µF
SS
R
OSC
R
OSC
18.7k
RF
5.23k
RF
5.23k
QT, QB = FAIRCHILD FDS6690A
QT1 = FAIRCHILD FDS6375 (PMOS only)
L1 = PANASONIC ETQP6F2R5SFA
Date: 1/21/05
DS = STMICROELECTRONICS STPS2L25U
C
IN
= SANYO 6TPB330M
C
OUT
= SANYO 4TPB470M
© Copyright 2005 Sipex Corporation
SP6120 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
ESD Rating ............................................................ 2kV HBM
ELECTRICAL CHARACTERISTICS
Unless otherwise specified: 3.0V < V
CC
<5.5V, 3.0V < BST < 13.2, 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
CONDITIONS
MIN
TYP
MAX
UNITS
No Switching
ENABLE = 0V
No Switching
-
-
-
0.95
5
1
1.8
20
20
mA
µA
µA
600
V
FB
= 1.35V, COMP = 0.5V, No
Faults
V
FB
= 1.15V, COMP = 1.6V
15
35
65
µS
µA
µA
MOhm
100
nA
COMP Source Current
COMP Output Impedence
V
FB
Input Bias Current
REFERENCE
Error Amplifier Reference
15
35
3
65
-
60
Trimmed with Error Amp in Unity
Gain
1.238
1.250
1.262
V
V
FB
3% Low Comparator
V
FB
3% High Comparator
OSCILLATOR & DELAY PATH
Oscillator Frequency
Oscillator Frequency #2
Duty Ratio
R
OSC
= 10.2kOhm
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
270
450
|-3|
3
%VREF
%VREF
300
500
95
330
550
kHz
kHz
%
R
OSC
Voltage
Minimum GH Pulse Width
0.65
V
120
ns
Date: 1/21/05
SP6120 Low Voltage, AnyFET
TM
, Synchronous, Buck Controller
© Copyright 2005 Sipex Corporation
2
ELECTRICAL CHARACTERISTICS
Unless otherwise specified: 3.0V < V
CC
<5.5V, 3.0V < BST < 13.2, 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, V
SS
= 2.5V
25
2
200
2.1
1.8
0.2
2.1
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
ENABLE/UVLO
V
CC
Start Threshold
V
CC
Stop Threshold
V
CC
Hysteresis
Enable Threshold
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
CC
> 4.5V
V
CC
> 4.5V
V
CC
> 4.5V
V
CC
> 4.5V
V
CC
> 4.5V
V
CC
> 4.5V
-
-
-
-
40
40
40
40
60
60
110
110
110
110
ns
ns
ns
ns
ns
ns
0.65
0.6
2.75
2.65
2.85
2.75
100
1.1
4
1.45
9
2.95
2.9
V
V
mV
V
µA
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.
Date: 1/21/05
SP6120 Low Voltage, AnyFET
TM
, Synchronous, Buck Controller
© Copyright 2005 Sipex Corporation
3
PIN DESCRIPTION
NAME
FUNCTION
PIN
NUMBER
SP6120
N/C
ENABLE
ISP
ISN
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 - 18,700 Ohms, 300kHz; 10,200 Ohms, 500kHz.
Programming Pin:
PROG = GND; MODE = NFET/CONTINOUS
PROG = 68k
Ω
to GND; MODE = NFET/DISCONTINOUS
PROG = V
CC
; MODE = PFET/CONTINOUS
PROG = 68k
Ω
to V
CC
; 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.
1
2
3
4
V
FB
5
COMP
6
SS
7
R
OSC
8
PROG
9
V
CC
GL
PGND
G ND
SWN
10
11
12
13
14
GH
BST
15
16
Date: 1/21/05
SP6120 Low Voltage, AnyFET
TM
, Synchronous, Buck Controller
© Copyright 2005 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
SP6120
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
Date: 1/21/05
C
IN
= SANYO 6TPB330M
C
OUT
= SANYO 4TPB470M
SP6120 Low Voltage, AnyFET
TM
, Synchronous, Buck Controller
© Copyright 2005 Sipex Corporation
5
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