SC2608A Datasheet

SC2608A
Simple, Synchronous
Voltage Mode PWM Controller
POWER MANAGEMENT
Description
Features
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SC2608A features include temperature compensated ‹
voltage reference, triangle wave oscillator, current limit ‹
comparator, and an externally compensated error ampli- ‹
The SC2608A is a versatile voltage-mode PWM controller designed for use in step down DC/DC power supply
applications. A simple, fixed frequency, highly efficient
buck regulator can be implemented using the SC2608A
with minimal external components. The input voltage
range is from +5V to +12V. Internal level shift and drive
circuitry eliminates the need for an expensive P-channel,
high-side MOSFET. The small device footprint allows for
compact circuit design.
fier. Current limit is implemented by sensing the voltage
drop across the bottom MOSFET RDS(ON).
+5V or +12V input voltage
250kHz operation
High efficiency (>90%)
1.5% Reference voltage accuracy
Hiccup mode over current protection
Robust output drive
RDS(ON) Current sensing for protection
Industrial temperature range
SO-8 package
Integrated boot strap diode
Thermal Shut down
Fully WEEE and RoHS Compliant
Applications
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The SC2608A operates at a fixed frequency of 250kHz
providing an optimum compromise between efficiency ,
external component size, and cost.
SC2608A has a thermal protection circuit, which is
activated if the junction temperature exceeds 150 OC.
Termination supplies
Low cost microprocessor supplies
Peripheral card supplies
Industrial power supplies
High density DC/DC conversion
Typical Application Circuit
SC2608A
SC2608
sense
COMP/SS SENSE
+12V/+5V/+3.3V
+12V
GND
VCC
DL
PHASE
DH
BST
VOUT
sense
Figure 1
Revision 2: April, 2006
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SC2608A
POWER MANAGEMENT
Absolute Maximum Ratings
Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified
in the Electrical Characteristics section is not implied.
P ar am e t e r
S y m b ol
M ax i m u m
Un i ts
VCC to GND
+20
V
BST to PHASE
+15
V
BST to GND
+35
V
-1 to +24
V
+15
V
-1 to +15
V
COMP/SS to GND
+7
V
SENSE to GND
+7
V
PHASE to GND (note1)
DH to PHASE
(note1)
DL to GND (note2)
Thermal Resistance Junction to Case
qJC
40
O
Thermal Resistance Junction to Ambient
qJA
120
O
Op erating Temp erature Range
TJ
-40 to +125
O
Storage Temp erature Range
TSTG
-65 to +150
O
ESD Rating (Human Body Model)
ESD
2
C/W
C/W
C
C
kV
Note 1: Under pulsing condition, the peak negative voltage can not be lower than -3.6V with less than 20nS from 50% to 50%.
Note 2: Under pulsing condition, the peak negative voltage can not be lower than -5V with less than 20nS from 50% to 50%.
Electrical Characteristics
Unless specified: VCC = 12V, VBST - VPhase = 12 V, VOUT = 3.3V, TJ = TA = 25oC.
P a r a m et er
Sym b ol
C on d i t i on s
Mi n
Typ
Ma x
Un i ts
14
V
P ow er Su p p l y
Supply Voltage
VCC
Supply Current
ICC
VCOMP < 0.4V
V FB
4.75V<Vcc<12.6V
0OC < TA < 85 OC
4.5
6
mA
E r r or A m p l i f i er
Feedback Voltage
-40 OC < TA < 125 OC
0.788
0 .8
0.812
V
0.8
V
E/A Transconductance
Gm
7
mS
Open Loop DC Gain
AO
60
dB
Input Bias Current
IFB
1
Output Sink Current
ISINK
VSENSE > 0.9V; VCOMP = 2.1V
-700
uA
Output Source Current
ISOURCE
VSENSE < 0.7V; VCOMP = 2.1V
120
uA
© 2006 Semtech Corp.
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3
uA
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SC2608A
POWER MANAGEMENT
Electrical Characteristics
Unless specified: VCC = 12V, VBST - VPhase = 12 V, VOUT = 3.3V, TJ = TA = 25oC.
P ar am e t e r
S y m b ol
Con d i t i on s
Mi n
Ty p
M ax
Un i ts
Switching Frequency
FOSC
Vcc =12V
225
250
275
kHz
Ramp Peak Voltage
V P -K
4.75V < VCC < 12.6V
1.8
V
Ramp Valley Voltage
VV
4.75V < VCC < 12.6V
0.8
V
Maximum Duty Cycle
DMAX
250kHz
85
%
DH Sink/Source Current
IDH
tPW > 400nS
VGS = 4.5V (src)
0.6
0.8
A
DL Sink/Source Current
IDL
VGS = 2.5V (snk)
0.6
0.7
DH Rise/Fall Time
tr, tf
CL = 3000p F, See Fig. 2
50
ns
DL Rise/Fall Time
tr, tf
CL = 4000p F, See Fig. 2
50
ns
Dead Time
td t
See Fig. 2
80
ns
DL Minimum On Time
tON
4.75V < Vcc < 12.6V
400
ns
V T R IP
4.75V < Vcc < 12.6V
Vtrip = VPHASE - GND
SS Source Current
ISRC
VCOMP < 2.5V
6
uA
SS Sink Current
ISNK
VCOMP > 0.5V
-6
uA
V th
-40< TJ < 85OC
O s ci l l at o r
M O S F E T Dri v ers
A
Cu rren t L i m i t
Trip Voltage
-400
-350
-300
mV
S o f t - S t ar t
U n d e r v o l t ag e L o ck o u t
UVLO Threshold
3.9
4.1
4.3
V
T h e r m al S h u t d o w n
Over Temp erature Trip Point
© 2006 Semtech Corp.
TOTP
150
3
C
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SC2608A
POWER MANAGEMENT
Gate Drive Timing Diagram
Figure 2
Block Diagram
BST
VCC
LEVEL
SHIFT
OSC
DH
S
REF
0.8V
PHASE
+
R
E/A
NON-OVERLAP
TIMING
Q
-
0
+
PWM
SENSE
-
VCC
Vcc
OCP &
UVLO
DL
GND
OCP
0
PHASE
0
+
-
0
COMP/SS
Figure 3
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2006 Semtech Corp.
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SC2608A
POWER MANAGEMENT
Pin Configuration
Ordering information
Top View
Device
(1 )
Package
Temp Range (TJ)
SO-8
-40 to 125OC
SC2608ASTRT(2)
BST
1
8
DH
2
7
COMP/SS
GND
3
6
SENSE
DL
4
5
VCC
PHASE
SC2608AEVB
Evaluation Board
Notes:
(1) Only available in tape and reel packaging. A reel contains 2500 devices.
(2) This device is fully WEEE and RoHS Compliant
(8-Pin SO-8)
Pin Descriptions
Pin
#
P i n N am e
1
BST
Bootstrap for high side driver.
2
DH
High side driver outp ut.
3
GN D
4
DL
Low side driver outp ut.
5
VCC
Chip bias sup p ly p in.
6
Sense
7
COMP/SS
8
PHASE
©
2006 Semtech Corp.
P i n Fu n c t i o n
Ground.
Outp ut voltage sense inp ut.
Error amp lifier outp ut. Connect comp ensation network to GN D. The comp ensation cap acitor
serves as soft star t cap acitor. By p ulling this p in low will disable the outp ut.
Connect this p in to the switching node between the MOSFETs.
5
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SC2608A
POWER MANAGEMENT
Theory of Operation
Synchronous Buck Converter
The output voltage of the synchronous converter is set
and controlled by the output of the error amplifier. The
inverting input of the error amplifier receives its voltage
from the SENSE pin. The non-inverting input of the error
amplifier is connected to an internal 0.8V reference. The
error amplifier output is connected to the compensation
pin. The error amplifier generates a current proportional
to (0.8V-Vsense), which is the COMP pin output current
(Transconductance ~ 7mS). The voltage on the COMP
pin is the integral of the error amplifier current. The COMP
voltage is the non-inverting input of the PWM comparator and controls the duty cycle of the MOSFET drivers.
The compensation network controls the stability and transient response of the regulator. The larger capacitor,
the slower COMP voltage changes, and slower the duty
cycle changes.
The non-inverting input voltage of the PWM comparator
is the triangular ramp signal generated from the oscillator.
The peak-to-peak voltage of the ramp is 1V, this is a
parameter used in control loop calculation. When the
oscillator ramp signal rises above the COMP voltage, the
comparator output goes high and the PWM latch is reset.
This pulls DH low, turning off the high-side MOSFET. After a short delay (dead time), DL is pulled high, turning on
the low-side MOSFET. The oscillator also produces a set
pulse for the PWM latch to turn off the low-side MOSFET,
After a delay time, DH is pulled high to turn on the highside MOSFET. The delay time is determined by a
monostable on the chip.
The triangle wave minimum is about 0.8V, and the maximum is about 1.8V. Thus, if Vcomp = 0.7V, high side duty
cycle is the minimum (~0%) , but if Vcomp is 1.8V, duty
cycle is at maximum ( ~90%).The internal oscillator uses an
on-chip capacitor and trimmed precision current sources
to set the oscillation frequency to 250kHz. Figure 1 shows
a 2.5V output converter. If the Vout <2.5V, then the SENSE
voltage < 0.8V. In this case the error amplifier will be sourcing current into the COMP pin so that COMP voltage and
duty cycle will gradually increase.If Vout > 2.5V, the error
amplifier will sink current and reduce the COMP voltage, so
that duty cycle will decrease.The circuit will be in steady
state when Vout =2.5V , Vsense = 0.8V, Icomp = 0. The
COMP voltage and duty cycle depend on Vin.
outputs remain in the off state whenever the supply voltage drops below the set threshold. Lockout occurs if VCC
falls below 4.1V typ.
Soft Start
The SC2608A provides a soft start function to prevent large
inrush currents upon power-up or hiccup retry. If both COMP
and SENSE pins are low (<300mV), the device enters soft
start mode, and the compensation capacitor is slowly
charged by an internal 6uA current source. When the COMP
pin reaches 300mV, the low side FET is switched on in order
to refresh the bootstrap capacitor, and begin PWM from a
known state. As the COMP pin rises above 800mV, PWM
begins at minimum duty cycle.
COMP continues to charge, slowly sweeping the device
through the duty cycle range until FB reaches the regulation
point of 800mV. Once FB reaches the regulation point, the
soft start current is switched off, and the strong error amp
is enabled, providing a glitch-free entrance into closed loop
operation. The overcurrent comparator is still active during
soft start mode, and will override soft start in the event
that an overcurrent is detected, such as startup into a
dead short.
R DS(ON) Current Limiting
In case of a short circuit or overload, the low-side (LS) FET
will conduct large currents. To protect the regulator in this
situation, the controller will shut down the regulator and
begin a soft start cycle later. While the LS driver is on,the
Phase voltage is compared to the OCP trip voltage. If the
phase voltage is lower than OCP trip voltage, an over current condition is detected. The low-side Rdson sense is implemented at end of each LS-FET turn-on duration. The minimum turn-on time of the LS-FET is set to be 400nS. This
will ensure the sampled signal is noise free by giving enough
time for the switching noise to die down.
OCP Hiccup
In the event that an overcurrent is detected, the SC2608A
latches the fault and begins a hiccup cycle. Switching is
immediately stopped, and the drivers are set to a tristate
condition (Both DH and DL are low). COMP is slowly
discharged to 300mV with an internal 6uA current source,
providing a long cooldown time to keep power dissipation
low in the event of a continuous dead short. Once COMP
and SENSE both fall below the 300mV threshold, the part
U nder V
oltage Lock
out
Voltage
Lockout
re-enables the 6uA soft start current , and the device begins
The under voltage lockout circuit of the SC2608A as- a normal startup cycle again.
sures that both high-side and low-side MOSFET driver
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SC2608A
POWER MANAGEMENT
Applications Information (Cont.)
G pwm =
A note to the user is needed: The device cannot restart
until both COMP and SENSE are low, to prevent start up
into a charged output. In the event of an overcurrent
condition, the output is quickly discharged by the load,
therefore bringing SENSE below the 300mV threshold. If
the COMP pin is pulled low by an external device (such as
an open-drain logic gate used for system shutdown), and
SENSE is high(above 300mV) while COMP is low, then the
SC2608A turns on the low side FET to discharge the output
before changing to shutdown or soft-start mode. The low
side FET turns off when SENSE drops below 300mV and
the converter remains in the tri-state condition until COMP
is released. Although this shutdown technique can be used
successfully on the SC2608A, the system designer using
COMP for external shutdown will need to consider the load
on the low side FET when discharging the output capacitor
bank. For large capacitor bank, this peak current can be
quite large as it is limited only by the RDS(ON) of the low side
FET. Fortunately the duration of this event is quite short,
and has been shown in the lab to have no detrimental effect
on the performance of the external FETs.
Disabling the output by pulling down COMP/SS pin is only
recommended when the output capacitor bank is not too
large.
VBG
G_PWM
L
R
Rc
0.8V
Ci
VIN
C
Co
⎛V ⎞
1 + sRcCo
T (s ) = Gm • G pwm • Vin • ⎜⎜ bg ⎟⎟ • H c (s ) •
⎛
⎛ R ⎞
L⎞
⎝ Vo ⎠
1 + s⎜⎜ RcCo + ⎟⎟ + s 2 LCo ⎜⎜1 + c ⎟⎟
R
o ⎠
⎝
⎝ Ro ⎠
H c (s ) =
Fo =
+ sC i
2π
1
LC o
(2) Calculate the ESR zero frequency of the output filter
capacitor:
Fesr =
1
2π R c C o
(3) Check that the ESR zero frequency is not too high.
F esr <
F SW
5
If this condition is not met, the compensation structure
may not provide loop stability. The solution is to add
some electrolytic capacitors to the output capacitor bank
to correct the output filter corner frequency and the ESR
zero frequency. In some cases, the filter inductance may
also need to be adjusted to shift the filter corner
frequency. It is not recommended to use only high frequency multi-layer ceramic capacitors for output filter.
(4) Choose the loop gain cross over frequency (0 dB frequency). It is recommended that the crossover frequency
is always less than one fifth of the switching frequency :
1
FX _ OVER = • FSW
5
If the transient specification is not stringent, it is better
to choose a crossover frequency that is less than one
tenth of the switching frequency for good noise immunity.
The resistor in the compensation network can then be
calculated as:
R1
Ro
R2
⎞ ⎛V ⎞
⎛F ⎞ ⎛F
1
R=
• ⎜⎜ esr ⎟⎟ • ⎜⎜ X _ OVER ⎟⎟ • ⎜ o ⎟
Gpwm •Vin • Gm ⎝ Fo ⎠ ⎝ Fesr ⎠ ⎜⎝ Vbg ⎟⎠
2
V
The compensation network includes a resistor and a capacitor in series, which terminates the output of the
error amplifier to the ground.
The PWM gain is inversion of the ramp amplitude, and
this gain is given by:
2006 Semtech Corp.
1
sC
The task here is to properly choose the compensation
network for a nicely shaped loop-gain Bode plot. The
following design procedures are recommended to accomplish the goal:
(1) Calculate the corner frequency of the output filter:
The control model of SC2608A is depicted in Fig. 4.
This model can also be used to generate loop gain Bode
plots. The bandgap reference is 0.8V and trimmed to
+/-1% accuracy. The desired output voltage can be
achieved by setting the resistive divider network, R1 and
R2. The error amplifier is transconductance type with fixed
0 . 007 A
gain of:
©
1
1
R+
Fig. 4. SC2608A small signal model.
Gm =
Vramp
where the ramp amplitude is fixed at 1 volts.
The total control loop-gain can then be derived as
follows:
Compensation Network Design
E/A
1
when
F o < F esr <
7
F sw
5
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SC2608A
POWER MANAGEMENT
Applications Information (Cont.)
An example is given below to demonstrate the procedure introduced above.
(5) The compensation capacitor is determined by choosing the compensator zero to be about one fifth of the
output filter corner frequency:
F zero
C=
C o=4400uF
R c=0.009 Ω
Vbg=0.8V
Vramp=1V
Gm=0.007A/V
Vin=12V
Vo=2.5V
Io=15A
Fsw=250KHz
L=2.2uH
F
= o
5
1
2πR • Fzero
SC2608A soft start time is determined by the
compensation capacitor. Capacitance can be adjusted
to satisfy the soft start requirement.
set
(6) The final step is to generate the Bode plot by using
the simulation model in Fig. 4 or using the equations provided here with Mathcad. The phase margin can then be
checked using the Bode plot.
C i=1nF
Rc=1.33KΩ
set to Rc=1.5KΩ
C=327.95nF
set to C=100nF
for suitable soft start time
Loop Gain Mag (dB)
100
50
mag( i)
0
50
10
100
1 .10
1 .10
3
4
1 .10
5
1 .10
1 .10
5
1 .10
6
Fi
Loop Gain Phase (Degree)
0
45
phase ( i)
90
135
180
10
100
1 .10
1 .10
3
4
6
Fi
Fig. 5. Bode plot of the loop
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2006 Semtech Corp.
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SC2608A
POWER MANAGEMENT
Typical Performance Characteristics
V re f vs. Te m p e ra ture
F re q ue nc y vs . Te m p e ra ture
0 .8 3
270
Frequency (kHz)
Vref(V)
0 .8 2
0 .8 1
0 .8 0
0 .7 9
260
250
240
230
220
-5 0
-2 5
0
25
50
75
100
125
-5 0
-2 5
0
o
100
125
100
125
100
125
U V L O vs . Te m p e ra ture
I_ lim it vs. Te m p e ra ture
4 .2 5
380
4 .2 0
370
UVLO (V)
I_limit trip (mV)
75
Te mpe ra ture ( C )
390
360
350
340
4 .1 5
4 .1 0
4 .0 5
330
4 .0 0
320
-5 0
-2 5
0
25
50
75
100
125
-5 0
-2 5
0
25
50
75
o
o
Te mpe ra ture ( C )
Te mpe ra ture ( C )
G a te d rive r d e a d tim e vs . Te m p e ra ture
Ic c vs . Te m p e ra ture
40
15
14
30
Icc (mA)
Gate driver dead time (ns)
50
o
Te mpe ra ture ( C )
20
13
12
11
10
9
8
7
10
-5 0
-2 5
0
25
50
75
100
125
-5 0
o
2006 Semtech Corp.
-2 5
0
25
50
75
o
Te m pe ra ture ( C )
©
25
Te m pe ra ture ( C )
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SC2608A
POWER MANAGEMENT
Application Information
TTypical
ypical Application Schematic
C4
100pF
C3
U1
R5
1R
C13
1uF/16V
VCC
DL
C5
1uF/16V
L11.2uH
Q2
3
4
R4
1R
C12
2.2n
SC2608A
C7
C8
C9
C10
C11
4.7uF /6.3V
+12V
SENSE GND
2
4.7uF /6.3V
5
COMP/SS DH
4.7uF /6.3V
Sense
6
BST
2200uF /6.3V
68nF
Phase
2200uF /6.3V
C6
2.5VOUT/15A
1
IP B13N 03LA
8
7
R2 1k
C2
1500uF /16V
R1
2R2
C1
1500uF /16V
IP B09N 03LA
Q1
4.7uF /16V
+12V/+5V/+3.3V
R3
1k
Sense
R6
1k
VOUT=0.8V X (R3+R6)/R6
Bill of Materials
©
Item
Qu an ti ty
Referen ce
Par t
Ven d er
1
1
C1
4.7u F/16V
A ny
2
2
C2,C3
1500u F/16V
Pan ason i c FJ
3
1
C4
100p F/50V
A ny
4
2
C5,C13
1u F/16V
A ny
5
1
C6
68n F/25V
A ny
6
2
C7,C8
2200u F/6.3V
Pan ason i c FJ
7
3
C9,C10,C11
4.7u F/6.3V
A ny
8
1
C12
2.2n F
A ny
9
1
L1
1.2u H
A ny
10
1
Q1
IPD09N 03LA
In fi n eon
11
1
Q2
IPD13N 03LA
In fi n eon
12
1
R1
2R2
A ny
13
1
R2
1K
A ny
14
2
R3,R6
1K, 1%
A ny
15
2
R4,R5
1R0
A ny
16
1
U1
SC2608A
SEMTECH
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SC2608A
POWER MANAGEMENT
Typical Performance Characteristics
Start up
Efficiency V. S. Load Current
Vin
95
94
93
92
91
90
89
88
87
86
85
Comp/ SS
DL
VO
0
2
4
6
8
10
12
14
16
18
20
Over Current Protection (21A DC tripped)
Transient Response
Vin
COMP/SS
Comp/ SS
VOUT
DL
IL(10A/DIV)
VO
5 -18 A step load
OCP HICCUP
Gate waveforms
Vin
DH
Comp/ SS
Phase node
DL
DL
VO
15 A sustain loading
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POWER MANAGEMENT
Application Information
TTypical
ypical DDR VDDQ Application Schematic
C4
VCC
C15
1uF/16V
DL
3
4
Q2
R4
2R2
1500uF /16V
1500uF /16V
L1
1.2uH/40A
C14
1n
SC2608A
C8
C9
C10
C11
C12 C13
4.7uF /6.3V
SENSE GND
C6
1uF/16V
4.7uF /6.3V
COMP/SS DH
2
1800uF /6.3V
5
D1
BAT54H
D2
1N4148
BST
1800uF /6.3V
6
Phase
1800uF /6.3V
C7 68nF
Sense
1.8VOUT/24A
1
IP B 09N 03LA
5VDual
C3
U1
8
7
R2
1k
C2
4.7uF /6.3V
C5
100pF
C1
1500uF /16V
R1
2.2R
IP B 09N 03LA
Q1
4.7uF /16V
5VDual
R3
1.27k
Sense
R5
1k
+12V
Bill of Materials
©
Item
Qu an ti ty
Referen ce
Par t
Ven d er
1
4
C1,C11,C12,C13
4.7u F/6.3V
A ny
2
3
C2,C3,C4
1500u F/6.3V
Pan ason i c FJ
3
1
C5
100p F/50V
A ny
4
2
C6,C15
1u F/16V
A ny
5
1
C7
68n F/25V
A ny
6
3
C8,C9,C10
1800u F/6.3V
Pan ason i c FJ
7
1
C14
1n F/50V
A ny
8
1
D1
B AT54H
A ny
9
1
D2
1N 4148
A ny
10
1
L1
1.2u H/40A
A ny
11
1
Q1
IPD09N 03LA
In fi n eon
12
1
Q2
IPD09N 03LA
In fi n eon
13
2
R1,R4
2R2
A ny
14
1
R2
1K
A ny
15
1
R3
1.27K, 1%
A ny
16
1
R5
1K, 1%
A ny
17
1
U1
SC2608A
SEMTECH
2006 Semtech Corp.
12
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SC2608A
POWER MANAGEMENT
Application Information
TTypical
ypical High In
put V
oltage Application Schematic
Input
Voltage
20VIN
Sense
R6 1KR/1206
5
Vin
SENSE GND
VCC
DL
C4
1uF/16V
2
3
4
C10
2.2nF
SC2608A
1KR/1206
R7
D1
8.2V
C11
1uF/16V
2.2uH
Q2
R4
2R2
C9
1n
C6
C7
C8
4.7uF /6.3V
6
COMP/SS DH
4.7uF /6.3V
C5 68n
BST
5VOUT/8A
2200uF /6.3V
1K
Phase
L1
1
IPD 13N 03LA
8
7
R3
R2 5R1
U1
C3
10pF/Opt.
C2
1000uF /25V
R1 0R
C1
4.7uF /25V
IPD 13N 03LA
Q1
R5
5.25K
Sense
R7
1k
Bill of Materials
©
Item
Qu an ti ty
Referen ce
Par t
Ven d er
1
1
C1
4.7u F/25V
A ny
2
1
C2
1000u F/25V
Pan ason i c FJ
3
1
C3
10p F/50V , Op t.
A ny
4
2
C4,C11
1u F/16V
A ny
5
1
C5
68n F/16V
A ny
6
1
C6
2200u F/6.3V
Pan ason i c FJ
7
2
C7,C8
4.7u F/6.3V
A ny
8
1
C9
1n F/50V
A ny
9
1
C10
2.2n F/50V
A ny
10
1
D1
Zen er 8.2V
Any
11
1
L1
2.2u H/15A
A ny
12
1
Q1
IPD13N 03LA
In fi n eon
13
1
Q2
IPD13N 03LA
In fi n eon
14
1
R1
0R
A ny
15
1
R2
5.1R
A ny
16
2
R3,R7
1.K, 1%
A ny
17
1
R4
2R2
A ny
18
1
R5
5.25K, 1%
A ny
19
2
R6,R7
1KR, 1206
A ny
20
1
U1
SC2608A
SEMTECH
2006 Semtech Corp.
13
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SC2608A
POWER MANAGEMENT
Outline Drawing - SO-8
A
D IM
D
e
2 X E /2
E1
1
E
2
ccc C
2 X N /2 T IP S
.0 6 9
.0 1 0
.0 6 5
.0 2 0
.0 1 0
.1 9 7
.1 9 3
.1 5 7
.1 5 4
.2 3 6 B S C
.0 5 0 B S C
.0 1 0
.0 2 0
.0 4 1
.0 2 8
.0 1 6
(.0 4 1 )
8
8
0
.0 0 4
.0 1 0
.0 0 8
.0 5 3
.0 0 4
.0 4 9
.0 1 2
.0 0 7
.1 8 9
.1 5 0
A
A1
A2
b
c
D
E1
E
e
h
L
L1
N
01
aaa
bbb
ccc
N
e /2
B
D
D IM E N S IO N S
M IL L IM E T E R S
IN C H E S
M IN N O M M A X M IN N O M M A X
1 .7 5
0 .2 5
1 .6 5
0 .5 1
0 .2 5
5 .0 0
4 .9 0
4 .0 0
3 .9 0
6 .0 0 B S C
1 .2 7 B S C
0 .2 5
0 .5 0
0 .4 0
1 .0 4
0 .7 2
(1 .0 4 )
8
0
8
0 .1 0
0 .2 5
0 .2 0
1 .3 5
0 .1 0
1 .2 5
0 .3 1
0 .1 7
4 .8 0
3 .8 0
aaa C
A2
S E A T IN G
PLANE
C
h
A
h
A1
bxN
bbb
H
C A -B D
c
GAGE
P LA N E
0 .2 5
S E E D E T A IL
L
(L 1 )
A
D E T A IL
S ID E V IE W
01
A
NO TES:
©
1.
C O N T R O L L IN G D IM E N S IO N S A R E IN M IL L IM E T E R S (A N G L E S IN D E G R E E S ).
2.
DATUM S
3.
D IM E N S IO N S "E 1 " A N D "D " D O N O T IN C L U D E M O L D F L A S H , P R O T R U S IO N S
OR GATE BURRS.
2006 Semtech Corp.
-A -
AND
-B -
T O B E D E T E R M IN E D A T D A T U M P L A N E -H -
14
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SC2608A
POWER MANAGEMENT
Land Pattern - SO-8
X
DIM
(C)
G
Z
Y
C
G
P
X
Y
Z
DIMENSIONS
INCHES
MILLIMETERS
(.205)
.118
.050
.024
.087
.291
(5.20)
3.00
1.27
0.60
2.20
7.40
P
NOTES:
1.
THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY.
CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR
COMPANY'S MANUFACTURING GUIDELINES ARE MET.
2. REFERENCE IPC-SM-782A, RLP NO. 300A.
Contact Information
Semtech Corporation
Power Management Products Division
200 Flynn Road, Camarillo, CA 93012
Phone: (805)498-2111 FAX (805)498-3804
©
2006 Semtech Corp.
15
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