DC2194A - Demo Manual

DEMO MANUAL DC2194A
LTM4642IY
20VIN, DUAL 4A or SINGLE 8A
DC/DC µMODULE REGULATOR
Description
Demonstration circuit of DC2194A features the
LTM®4642IY, the wide input voltage, high efficiency and
power density, dual 4A or single 8A DC/DC step-down
µModule regulator. The step-down regulator operates
from an input voltage range of 4.5V to 20V (or 2.5V min.
with 5V external bias voltage at CPWR) and provides an
adjustable output voltage range from 0.6V to 5V at 4A load
current per channel. The part is capable of operating in
dual phase single output, delivers up to 8A load current
with interleaved two phases at 180 degrees. Differential
output voltage sensing is available on Channel 1 for applications requiring more accurate output load regulation.
A user-selectable mode input is provided to allow users to
trade off ripple noise for light load efficiency: Discontinuous Mode (DCM) of operation delivers higher efficiency
at light load while Continuous Conduction Mode (CCM) is
preferred for noise sensitive applications. The mode pin
can also be used to sync the switching frequency to an
external clock. Programmable switching frequency range
is from 600kHz to 1400kHz with a ±30% synchronization
capture range. Constant on time, valley current mode
control architecture and integrated internal control loop
compensation allow very fast transient response to line
and load changes while maintaining loop stability.
It is recommended to read the data sheet and demo
manual of LTM4642 prior using or making any changes
to DC2194A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2194A
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Board Photo
dc2194af
1
DEMO MANUAL DC2194A
Performance Summary
PARAMETER
Specifications are at TA = 25°C
CONDITIONS
VALUE
Dual Phase Dual Output Configuration (Default)
Input Voltage Range
4.5V to 20V
Input Voltage Range
2.5V to 20V
(with External CPWR Bias Supply)
Default Output Voltage
VOUT1
VOUT2
VIN = 4.5V to 20V
ILOAD = 0A to 4A
fSW = 800kHz
Default Switching Frequency
Programmed Frequency with an External Resistor
from FREQ Pin to SGND
Maximum Continuous Output Current IOUT per Channel
(Dual Phase Dual Outputs)
VIN = 4.5V to 20V
fSW = 800kHz
Output Voltage Ripples
(Peak-to-Peak)
VOUT1,P-P
VOUT2,P-P
(Dual Phase Dual Outputs)
VIN = 12V
fSW = 800kHz
VOUT1 = 1.8V at IOUT1 = 4A
VOUT2 = 1.2V at IOUT2 = 4A
COUT = 1x150µF + 1x22µF per Channel
VOUT1,P-P = 27mV (Figure 8a)
VOUT2,P-P = 17mV (Figure 8b)
Dynamic Load Transient Response
VOUT1,P-P
VOUT2,P-P
(Dual Phase Dual Outputs)
VIN = 12V
fSW = 800kHz
Mode = CCM
VOUT1 = 1.8V, IOUT_STEP = 2A to 4A
VOUT2 = 1.2V, IOUT_STEP = 2A to 4A
COUT = 1x150µF + 1x22µF per Channel
VOUT1,P-P = 86mV (Figure 7a)
VOUT2,P-P = 67mV (Figure 7b)
Efficiency
(Dual Phase Dual Outputs)
VIN = 12V
fSW = 800kHz
VOUT1 = 1.8V at IOUT1 = 4A
VOUT2 = 1.2V at IOUT2 = 4A
Thermal Performance
(Dual Phase Dual Outputs)
VIN = 12V
fSW = 800kHz
VOUT1 = 1.8V at IOUT1 = 4A
VOUT2 = 1.2V at IOUT2 = 4A
TA = 25°C, No Forced Airflow/Heat Sink
2
1.8V ±1.5%
1.2V ±1.5%
800kHz ±10%
4A
Channel 1: 87.8% (Figure 4)
Channel 2: 84.2% (Figure 4)
57.2°C Peak Temperature
(Figure 11a)
dc2194af
DEMO MANUAL DC2194A
Performance Summary
PARAMETER
Specifications are at TA = 25°C
CONDITIONS
VALUE
Dual Phase Single Output Configuration (Optional)
Input Voltage Range
4.5V to 20V
Input Voltage Range
2.5V to 20V
(with External CPWR Bias Supply)
Default Output Voltage
VOUT
VIN = 4.5V to 20V
ILOAD = 0A to 8A
fSW = 800kHz
Default Switching Frequency
Programmed Frequency with External Resistor from
FREQ Pin to SGND
Maximum Continuous Output Current IOUT
(Dual Phase Single Output)
VIN = 4.5V to 20V
fSW = 800kHz
Output Voltage Ripples
(Peak-to-Peak)
VOUT,P-P
(Dual Phase Single Output)
VIN = 12V
fSW = 800kHz
VOUT = 1.8V at IOUT = 8A
COUT = 1x100µF + 1x47µF per channel
VOUT,P-P = 10mV (Figure 10a)
Dynamic Load Transient Response
VOUT,P-P
(Dual Phase Single Output)
VIN = 12V
fSW = 800kHz
Mode = CCM
VOUT = 1.8V, IOUT_STEP = 4A to 8A
COUT = 1x100µF + 1x47µF per Channel
VOUT,P-P = 138mV (Figure 9b )
Efficiency
(Dual Phase Single Output)
VIN = 12V
fSW = 800kHz
Mode = CCM
VOUT = 1.8V at IOUT = 8A
Thermal Performance
(Dual Phase Single Output)
VIN = 12V
fSW = 800kHz
VOUT = 1.8V at IOUT = 8A
TA = 25°C, No Forced Airflow/Heat Sink
1.8V ±1.5%
800kHz ±10%
8A
87.9 % (Figure 6)
59.2°C Peak Temperature
(Figure 12a)
dc2194af
3
DEMO MANUAL DC2194A
Quick Start Procedure
Demonstration circuit DC2194A is easy to set up to evaluate
the performance of the LTM4642. Please refer to Figure 1
for proper measurement equipment setup and follow the
procedures below:
probe placement technique. Short, still leads need to
be soldered to the (+) and (–) terminals of an output
capacitor. The probe’s ground ring needs to touch the
(–) lead and the probe tip needs to touch the (+) lead.
1. With power off, connect the input power supply at VIN
(J4) and GND (J5)
6. DC2194A provides convenient on board BNC terminals
to accurately measure output ripples of Channel 1 and
Channel 2. Connect short BNC cables from VOUT1,
VOUT2 to the scope inputs (Scope probe ratio 1:1, AC
coupling) to observe output voltage ripples.
2. Connect the first load between VOUT1 (J6) and GND
(J7) for Channel 1, connect the second load between
VOUT2 (J8) and GND (J3) for Channel 2. Preset all the
loads to 0A.
3. Connect the DMMs at the input (E4 and E5) to monitor input voltage. Connect DMMs at VO1+ (E6) and
VO1– (E7), VO2+ (E11) and VO2– (E9) to monitor DC
output voltages. These output voltage test points are
Kelvin sensed directly across COUT1 for Channel 1 and
COUT4 for Channel 2 to provide accurate measurement
of output voltages. Do not apply load current to any of
the above test points to avoid damage to the regulator.
Do not connect the ground leads of scope probes to
VO1– and VO2–.
4. Turn on the power supply at the input. Measure and
make sure the input supply voltage is 12V. Place the
RUN 1 (JP4) and RUN2 (JP5) in the “ON” position. The
output voltage should be 1.8V ±1.5% for Channel 1 and
1.2 ±1.5% for Channel 2.
5. Once the input and output voltages are properly established, adjust the input voltage between 4.5V and 20V
and the loads within the operating range of 0A to 4A
max per channel. Observe the output voltage regulation, output voltage ripples, switch node waveform,
load transient response and other parameters. Refer to
Figure 2 for proper output voltage ripple measurement.
NOTE 1: To measure the input/output voltage ripple
properly, do not use the long ground lead on the
oscil­loscope probe. See Figure 2 for the proper scope
4
7. DC2194A provides an optional onboard load transient
circuit to measure ∆VOUT peak-to-peak deviation during rising or falling dynamic load transient. The simple
load step circuit consisting of a 30V N-channel power
MOSFET in series with a 10mΩ, 1W,1% current sense
resistor. The MOSFET is configured as a voltage control
current source (VCCS) device, therefore the output current step and its magnitude is created and controlled by
adjusting the amplitude of the applied input voltage step
at the gate of the MOSFET. Use a function generator to
provide a voltage pulse between IOSTEP CLK (E17) and
GND (E18); the input voltage pulse should be set at the
frequency less than 10Hz and maximum duty cycle of
less than 5% to avoid excessive thermal stress on the
MOSFET device. The output current step is measured
directly across the 10mΩ current sense resistor and
monitored by connecting a BNC cable from IOSTEP to
the input of the oscilloscope (scope probe ratio 1:1,
DC coupling), the equivalent voltage to current scale
is 10mV/1A. The load step current slew rate dI/dt can
be set by adjusting the rising time and fall time of the
input voltage pulse.
The default load step circuit is connected to VOUT1 but
can be used for VOUT2 by simply removing the zero
Ohm jumper R27 and stuffing it at the position of R28
and vice versa. Repeat Step 7 to perform load step
transient evaluation for Channel 2.
dc2194af
DEMO MANUAL DC2194A
Quick Start Procedure
–
+
+
LOAD1
(0A TO 4A)
–
LOAD2
(0A TO 4A)
+
–
+
VOUT1
–
VOUT2
–
+
VIN
4.5V TO 20V
+
–
+
–
Figure 1. Proper Measurement Equipment Setup
+
VOUT
–
COUT
GND
Figure 2. Scope Probe Placement for Measuring Input or Output Voltage Ripple
dc2194af
5
DEMO MANUAL DC2194A
Quick Start Procedure
8. To program other output voltages for Channel 1 or
Channel 2, insert correct values of the bottom feedback
resistors (Table 1).
These values are calculated based on a typical feedback
reference voltage of 0.6V and fixed internal top feedback
resistor of 60.4kΩ.
Table 1. Bottom Resistive Divider Values (1%) for Setting
Typical Output Voltages
VOUT (V)
1.0
1.2
1.5
1.8
2.5
3.3
5.0
RBOT (kΩ)
90.9
60.4
40.2
30.1
19.1
13.3
8.25
* NOTE 2: LTM4642 has been internally compensated
for most of input, output voltages and frequency ranges.
However, to obtain the best efficiency, thermal and load
transient response performance when selecting output
voltages different than the demo board default set voltages,
the following parameters need to be optimized accordingly:
input voltages, switching frequency, output capacitors
and optional external compensation values (Feedforward
Capacitors: C1, C12 and CCOMP: C3, C11). Please refer to
Table 2 for more details.
Table 2. Suggested Optimized Switching Frequency for Typical
Input and Output Voltages
VIN
(V)
3.3V 5.0V
5V
12V
12V
12V
20V
20V
20V
VOUT
(V)
1V
1V 1.8V 1.0V 1.5V 2.5V 1V 1.5V 2.5V
1.2V 1.2V 2.5V 1.2V 1.8V 3.3V 1.2V 1.8V 3.3V
1.5V 1.5V 3.3V
2.5V 5.0V
5.0V
1.8V 1.8V
fSW
(kHz)
600
650
800
650
800
1000
1200
650
800
1000
1200
R5
(kΩ)
R_freq
68.1
66.5
49.9
66.5
49.9
39.2
32.4
66.5
49.9
39.2
32.4
Differential Output Voltage Sensing
The LTM4642 includes an internal low offset, high input
impedance, unity gain, high bandwidth differential amplifier for applications that require true remote sensing. This
feature allows users to accurately sense the output voltage
across the output capacitor at the load point in a widely
distributed power system where power trace’s parasitic
voltage drops are always presented. The differential amplifier’s output is internally connected to the error amplifier’s
6
inverting input. VOUTS1+ and VOUTS1– are Kelvin connected
directly across COUT1 on DC2194A.
(Optional) Output Voltage Tracking
TRK/SS1 and TRK/SS2 allow users to program output
voltage supply tracking during start-up or shutdown while
operating several voltage supply rails at the same time.
Channel 1 is configured as a master and Channel 2 is a
slave channel on DC2194A. Coincident tracking mode
can be implemented by connecting TRK/SS2 of the
slave channel to the mid-point of an additional resistive
divider (R19, R20) to the master channel’s output voltage. The ratio of this divider is identical to that of the
slave’s channel feedback divider. In this tracking mode,
output voltage of the master channel must be higher
than the output voltage of the slave channel. The rising
time of the output voltage can be adjusted by changing
the soft start capacitor’s values of the master channel.
Coincident tracking mode can be activated by inserting
JP6 between Pin 1 and 2 of TRACK2 SEL and performing start-up/shutdown by releasing RUN1 from GND
and pulling RUN1 to GND accordingly. Tracking mode
can be observed by monitoring VOUT1, VOUT2 and FB1,
FB2 using scope probes. The same method can be used
to configure VOUT1 or VOUT2 tracking an external supply
voltage by inserting JP3 (TRK1 SEL) to TRACK or JP6
(TRK2 SEL) to EXT, applying an external voltage supply
at TRACK1 (E8) or TRACK2 (E13) and repeating start-up/
shutdown test to evaluate the tracking function of the
regulator. Ratiometric tracking mode can be achieved by
connecting TRK/SS2 to FB1. Ratiometric tracking mode
can save two resistors while coincident tracking mode
offers better voltage regulation. It is optional for users
to determine the most appropriate tracking method for
the power supply design.
(Optional) External Frequency Synchronization
The MODE/PLLIN pin can be used to synchronize the
internal oscillator clock frequency to the external clock
signal. Place JP2 (MODE/PLLIN) to CLKIN, apply an
external clock at CLKIN (E10) to vary the switching frequency within ±30% of the set frequency. The external
clock input high threshold is 2V typical, while the input
low threshold is 0.5V.
dc2194af
DEMO MANUAL DC2194A
Quick Start Procedure
(Optional) Lower the Default Current Limit Setting for
Channel 1
The default current limit setting for Channel 1 is 7A
peak current limit with VRNG1 tied to INTVCC. DC2194A
provides an option to lower the peak current limit setting
for Channel 1 (applications that required lower peak
current limit to effectively protect the power devices during
temporary output overloaded condition or output shorted
circuit) by adjusting the DC voltage level at VRNG1. An
external resistive divider from INTVCC can be used to set
the voltage on VRNG pin between 1V to 0.6V, lower the
VRNG1 voltage than 1V resulting in a lower maximum
sense voltage and peak current limit.
(Optional) Operation with Low VIN Range
(2.5V ≤ VIN ≤ 4.5V)
LTM4642 is equipped with CPWR pin, allowing VIN to
operate down to VIN = 3.3V typical. CPWR pin is the main
input power to the control IC and can be disconnected from
the default VIN supply voltage (Remove R13) and tied to
an external 5V bias supply voltage at E14. If the DC bias
supply voltage for CPWR is less than 5.3V, DRVCC can
also be tied to this pin by stuffing R15 = 0Ω. Since the
RUN pins of Channel 1 and Channel 2 are directly tied to
VIN, pull up resistors at the RUN pins (R9, R23) should
be re-calculated and inserted to make sure the part can
start up at low VIN. A good value to start with is 115kΩ
using internal RUN pin pull-down resistor of 100k, RUN
Pin On threshold of 1.1V min. to 1.3V max and RUN pin
absolute max voltage of 6V. Care should be taken by not
exceeding maximum voltage rating on DRVCC/INTVCC pin
when operating in this mode. Refer to Table 2. for recommended optimized switching frequency while operating at
low VIN voltage range.
(Optional) Operation with EXTVCC
EXTVCC pin is available for optional external 5V bias supply
to power INTVCC/DRVCC. The advantage of using EXTVCC
is to shut down the internal LDO powered from VIN, turn
on the internal EXTVCC switch and directly source the external 5V bias supply to power INTVCC/DRVCC, therefore
improving overall efficiency and reducing temperature
rise of the part, especially at high input voltage range. An
onboard turret (E3) is available for EXTVCC with a minimum
of 4.7µF decoupling ceramic capacitor to PGND. Do not
exceed the maximum rated voltage for EXTVCC and make
sure VIN is powered up before applying EXTVCC.
(Optional) Dual Phase Single Output Circuit
Configuration:
DC2194A can be configured as dual phase single output
to provide up to 8A total load current.
The following simple modification is required: (Channel 1
is master, Channel 2 is slave). Please refer to Table 3 for
more details.
Table 3. Dual Phase Single Output Circuit Configuration
PIN NAME CONNECTIONS
1
VOUT1
VOUT2
2
FB2
3
COMP2
4
RUN1
RUN2
MODIFIED COMPONENTS
Tie VOUT1, VOUT2 together.
Stuff R35 = 0Ω and short the exposed copper pads at VOUT1, VOUT2 on the
bottom layer of the board .
Tie to INTVCC to disable the EA of the slave channel.
Remove FB2 bottom divider resistor (R17) and stuff R26 = 0Ω. Note: To
calculate the required bottom feedback resistor divider for the master
channel, use RTOP_EQUIV = (60.4k//60.4k) for dual phase single output.
Left open or externally tied to COMP1.
Remove C11.
Tie RUN1, RUN2 together.
Stuff R25 = 0Ω, R9 = 115kΩ, remove R23.
5
TRSK/SS2 Left open.
Remove JP6.
6
PHASMD
Tie to SGND or FLOAT: set phase interleaved 180°
between CH1 and CH2.
JP1 = SNGD or FLOAT.
7
PGOOD2
Left open.
Remove R12.
dc2194af
7
DEMO MANUAL DC2194A
100
95
95
90
90
85
85
EFFICIENCY (%)
EFFICIENCY (%)
Quick Start Procedure
80
75
70
1.0VOUT
1.2VOUT
1.5VOUT
1.8VOUT
2.5VOUT
3.3VOUT
65
60
65
50
0
1
2
3
LOAD CURRENT (A)
80
75
70
1.0VOUT
1.2VOUT
1.5VOUT
1.8VOUT
2.5VOUT
3.3VOUT
65
60
65
50
4
0
1
2
3
LOAD CURRENT (A)
DC2194 F03
DC2194 F04
Figure 4. Measured Efficiency at 12VIN, 800kHz,
Dual Phase Dual Outputs
95
95
90
90
85
85
80
80
EFFICIENCY (%)
EFFICIENCY (%)
Figure 3. Measured Efficiency at 5VIN, 800kHz,
Dual Phase Dual Outputs
75
70
65
1.2VOUT
1.5VOUT
1.8VOUT
2.5VOUT
60
65
50
0
1
2
3
LOAD CURRENT (A)
75
70
1.0VOUT
1.2VOUT
1.5VOUT
1.8VOUT
2.5VOUT
3.3VOUT
65
60
65
50
4
0
1
2
3
4
5
6
LOAD CURRENT (A)
DC2194 F05
7
8
DC2194 F06
Figure 5. Measured Efficiency at 20VIN, 800kHz,
Dual Phase Dual Outputs
Figure 6. Measured Efficiency at 12VIN, 800kHz,
Dual Phase Single Output
VO_P-P = 86mV
VO_P-P = 67mV
VOUT
50mV/DIV
VOUT
50mV/DIV
ILOAD
2A/DIV
2A TO 4A
50µs/DIV
fSW = 800kHz
VIN = 12V, VOUT = 1.8V
ILOAD STEP = 2A TO 4A AT 2A/µs
COUT_POSCAP = 1×150µF/4V/7mΩ
COUT_CERAMIC = 1×22µF/10V/X7R/1206
CFF = 220pF
DC2194 F07a
Figure 7a. Load Transient Response (CH1)
Dual Phase Dual Outputs
8
4
ILOAD
2A/DIV
2A TO 4A
50µs/DIV
fSW = 800kHz
VIN = 12V, VOUT = 1.2V
ILOAD STEP = 2A TO 4A AT 2A/µs
COUT_POSCAP = 1×150µF/4V/7mΩ
COUT_CERAMIC = 1×22µF/10V/X7R/1206
CFF = 220pF
DC2194 F07b
Figure 7b. Load Transient Response (CH2)
Dual Phase Dual Outputs
dc2194af
DEMO MANUAL DC2194A
Quick Start Procedure
20MHz BWL
20MHz BWL
VO_P-P = 27mV
VO_P-P = 17mV
VOUT
50mV/DIV
VOUT
50mV/DIV
5µs/DIV
fSW = 800kHz
VIN = 12V, VOUT = 1.8V
ILOAD = 4A
COUT_POSCAP = 1×150µF/4V/7mΩ
COUT_CERAMIC = 1×22µF/10V/X7R/1206
CFF = 220pF
5µs/DIV
fSW = 800kHz
VIN = 12V, VOUT = 1.2V
ILOAD = 4A
COUT_POSCAP = 1×150µF/4V/7mΩ
COUT_CERAMIC = 1×22µF/10V/X7R/1206
CFF = 220pF
DC2194 F08a
Figure 8a. Output Ripple Voltage (CH1),
Dual Phase Dual Outputs
DC2194 F08b
Figure 8b. Output Ripple Voltage (CH2)
Dual Phase Dual Outputs
VO_P-P = 138mV
VO_P-P = 73mV
VOUT
100mV/DIV
VOUT
50mV/DIV
ILOAD
2A/DIV
4A TO 6A
50µs/DIV
fSW = 800kHz
VIN = 12V, VOUT = 1.8V
ILOAD STEP = 4A TO 6A AT 2A/µs
COUT_CERAMIC = 1×100µF/6.3V/X5R/1206
+ 1×47µF/6.3V/X5R/1206
CFF = 220pF
ILOAD
5A/DIV
4A TO 8A
50µs/DIV
fSW = 800kHz
VIN = 12V, VOUT = 1.8V
ILOAD STEP = 4A TO 8A AT 4A/µs
COUT_CERAMIC = 1×100µF/6.3V/X5R/1206
+ 1×47µF/6.3V/X5R/1206
CFF = 220pF
DC2194 F09a
Figure 9a. Load Transient Response,
Dual Phase Single Output
DC2194 F09b
Figure 9b. Load Transient Response,
Dual Phase Single Output
20MHz BWL
20MHz BWL
VO_P-P = 10mV
VO_P-P = 10.6mV
VOUT
20mV/DIV
VOUT
20mV/DIV
5µs/DIV
fSW = 800kHz
VIN = 12V, VOUT = 1.8V
ILOAD = 8A
COUT_CERAMIC = 1×100µF/6.3V/X5R/1206
+ 1×47µF/6.3V/X5R/1206
CFF = 220pF
Figure 10a. Output Ripple Voltage,
Dual Phase Single Output
DC2194 F10a
5µs/DIV
fSW = 800kHz
VIN = 20V, VOUT = 1.8V
ILOAD = 8A
COUT_CERAMIC = 1×100µF/6.3V/X5R/1206
+ 1×47µF/6.3V/X5R/1206
CFF = 220pF
DC2194 F10b
Figure 10b. Output Ripple Voltage,
Dual Phase Single Output
dc2194af
9
DEMO MANUAL DC2194A
Quick Start Procedure
fSW = 800kHz
VOUT1 = 1.8V, VOUT2 = 1.2V
VIN = 12V, ILOAD = 4A PER PHASE
TA = 25°C, NO FORCED AIRFLOW, NO HEAT SINK
Figure 11a. Thermal Performance at 12VIN,
Dual Phase Dual Outputs
fSW = 800kHz
VOUT = 1.8V
VIN = 12V, ILOAD = 8A
TA = 25°C, NO FORCED AIRFLOW, NO HEAT SINK
Figure 12a. Thermal Performance at 12VIN,
Dual Phase Single Output
10
fSW = 800kHz
VOUT1 = 1.8V, VOUT2 = 1.2V
VIN = 20V, ILOAD = 4A PER PHASE
TA = 25°C, NO FORCED AIRFLOW, NO HEAT SINK
Figure 11b. Thermal Performance at 20VIN,
Dual Phase Dual Outputs
fSW = 800kHz
VOUT = 1.8V
VIN = 20V, ILOAD = 8A
TA = 25°C, NO FORCED AIRFLOW, NO HEAT SINK
Figure 12b. Thermal Performance at 20VIN,
Dual Phase Single Output
dc2194af
DEMO MANUAL DC2194A
Parts List
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
Required Circuit Components
1
1
CIN1
CAP., ALUM. ELECT., 100µF, 25V, 7343
PANASONIC, 25SVPF100M
2
2
CIN2, CIN3
CAP., 22µF, X5R, 25V, 10%, 1206
MURATA, GRM31CR61E226KE15L
3
2
COUT1, COUT4
CAP., 22µF, X7R, 10V, 20%, 1206
MURATA, GRM31CR71A226K
4
2
COUT3, COUT6
CAP., ALUM. ELECT., 150µF, 4V, 7343
PANASONIC, EEFSX0G151E7
5
2
C1, C12
CAP., 220pF, C0G, 50V, 5%, 0603
AVX, 06035A221JAT2A
6
2
C5, C15
CAP., 0.01µF, X7R, 25V, 10%, 0603
TDK, C1608X7R1E103K080AA
7
4
C7, C8, C9, C20
CAP., 4.7µF, X5R, 25V, 10%, 0603
MURATA, GRM188R61E475KE11D
8
2
C16, C17
CAP., 1µF, X5R, 6.3V, 10%, 0603
MURATA, GRM188R60J105KA01D
9
1
C19
CAP., 1µF, X7R, 10V, 10%, 0805
AVX, 0805ZC105KAT2A
10
1
Q1
MOSFET SPEED SRS 30V 30A LFPAK
RENESAS, RJK0305DPB-02#J0
11
8
R1, R2, R4, R13, R18,
R31, R32, R33
RES., 0 OHM, 1/10W, 0603
VISHAY, CRCW06030000Z0EA
12
2
R3, R8
RES., 30.1k, 1/10W, 1%, 0603
VISHAY, CRCW060330K1FKEA
13
1
R5
RES., 49.9k, 1/10W, 1%, 0603
VISHAY, CRCW060349K9FKEA
14
6
R7, R17, R19, R20, R21,
R22
RES., 60.4k, 1/10W, 1%, 0603
VISHAY, CRCW060360K4FKEA
15
2
R9, R23
RES., 255k, 1/10W, 1%, 0603
VISHAY, CRCW0603255KFKEA
16
3
R11, R12, R29
RES., 10k, 1/10W, 1%, 0603
VISHAY, CRCW060310K0FKEA
17
1
R14
RES., 2.2Ω, 1/10W, 1%, 0603
VISHAY, CRCW06032R20FKEA
18
1
R27
RES., 0Ω, 2010
TEPRO (NAKOMA), RNH6083
19
1
R30
RES., 0.010Ω, 1W, 1%, 2512
VISHAY, WSL2512R0100FEA
20
1
U1
I.C., LTM4642IY#PBF, BGA56-11.25X9X4.92
LINEAR TECH., LTM4642IY#PBF
CAP., OPT, 1206
OPT
Additional Demo Board Circuit Components
1
0
COUT2, COUT5
2
0
C2, C3, C4, C6, C10, C11, CAP., OPTION 0603
C13, C14, C18
OPT
3
0
R6, R16
RES., OPTION, 0805
OPT
4
0
R10, R15, R24, R25,
R26, R34
RES., OPTION, 0603
OPT
5
0
R28
RES., OPT, 2010
OPT
6
0
R35
RES., OPTION, 2512
NIC, NRC100ZOTRF
Hardware: For Demo Board Only
1
18
E1-E18
TEST POINT, TURRET, 0.094" MTG. HOLE
MILL-MAX, 2501-2-00-80-00-00-07-0
2
1
JP1
CONN., HEADER, 1X4, 2mm
WURTH ELEKTRONIK, 62000411121
3
2
JP2, JP6
CONN., HEADER, 2X3, 2mm
WURTH ELEKTRONIK, 62000621121
4
3
JP3, JP4, JP5
CONN., HEADER, 1X3, 2mm
WURTH ELEKTRONIK, 62000311121
5
6
XJP1-XJP6
SHUNT, 2mm
WURTH ELEKTRONIK, 60800213421
6
3
J1, J2, J9
CONN, BNC, 5 PINS
CONNEX, 112404
7
6
J3-J8
CONN., JACK, BANANA, NON-INSULATED, 0.218"
KEYSTONE, 575-4
8
4
(STAND-OFF)
STAND-OFF, NYLON, SNAP-ON, 0.500"
KEYSTONE, 8833(SNAP ON)
dc2194af
11
A
B
C
D
VO1+
VIN-
GND
o
E7
VO1-
150uF
4V
E8
30.1K
60.4K
TRACK
JP4
1
2
3
1
2
C6
OPT
R10
OPT
R9 VIN
255K
0.01uF
6
4
5
1. ALL RESISTORS ARE IN OHMS, 0603.
ALL CAPACITORS ARE IN MICROFARADS, 0603.
NOTE: UNLESS OTHERWISE SPECIFIED
E15
OFF
ON
JP3
RUN1
SOFT-START
3
C5
R8
JP2
DCM 3
CCM 5
0
R4
VFB1
MODE/PLLIN
CLKIN 1
2
R7
INTVCC
E10
E12
3
2
1
R2
0
+ COUT3
R1
0
VO1+
COUT2
OPT
1206
VIN
100uF
25V
25SVPF100M
+ CIN1
VOUT1
TRACK1 SEL.
TRACK1
CLKIN
CLKOUT
JP1
60
90
o
120
o
J7
J6
E6
E5
5
CLKOUT
PHASE INTVCC
VO1-
GND
VOUT1
1.8V / 4 A
RUN1
J5
J4
4.5V-20V
VIN
VIN+
4
RUN1
C2
OPT
C1
R5
C3
OPT
C4
49.9k
OPT
0805
INTVCC
R6
0
R33
4
2.375V<VIN<4.5V CPWR= EXT. 5V
DRVCC, CPWR=VIN
VRNG1
RUN1
TRKSS1
VFB1
COMP1
SW1
CPWR=VIN
G4
G3
F5
F4
E3
H3
FREQ
MODE_PLLIN
CLKOUT
PHASMD
VOUTS1
VOUTS-
VOUT1
VOUT1
VOUT1
VOUT1
VOUT1
4.5V<VIN<5.3V
R34
OPT
SW1
E4
C3
D4
B4
F2
F3
H2
H1
G2
G1
F1
VOUT1
4.5V<VIN<20V
VO1+
R3
220pF
30.1k
1%
CIN3
22uF
25V
1206
OPT VFB1
COUT1
22uF
10V
1206
CIN2
22uF
25V
1206
4
G5
VIN1
G6
VIN1
G7
VIN1
GND
A4
GND
A5
3
U1
R12
10K
INTVCC
E1
LTM4642IY
R11
10K
INTVCC
E16
R13 = 0 OHM
R15 = OPT
R13 = 0 OHM
R15 = 0 OHM
R13 = OPT
R15 = OPT
3
E14
PGOOD1 PGOOD2 CPWR
GND
C2
GND
A6
GND
A7
PGGOD1
C6
PGOOD2
C7
4.7uF
CPWR
R13
0
B6
E2
D2
B3
C5
C4
D3
A3
E6
D7
D6
C1
B2
B1
A2
A1
OFF
ON
JP5
1
2
3
RUN2
OPT
C11
SW2
R16
OPT
C10
2
LT
SCALE = NONE
GL
COUT4
22uF
10V
1206
__
ECO
0
60.4K
6
SOFT-START 5
DATE:
N/A
SIZE
EXTVCC
VO2-
GND
VOUT2
1.2V / 4 A
RUN2
RUN2
TRACK2
E13
VFB2
J3
J8
VO2+
1
DEMO CIRCUIT 2194A
Thursday, January 28, 2016
IC NO.
DATE
01/28/16
SHEET 1
OF 2
2
REV.
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
E2
60.4K
R22
60.4K
LTM4642IY
TECHNOLOGY
C15
0.01uF
60.4K
R21
VOUT1
60.4K
R20
R19
C12
220pF
VOUT2
E3
E9
E11
GL
APPROVED
HIGH DENSITY, DUAL 4A STEP-DOWN
m MODULE REGULATOR
TITLE: SCHEMATIC
R24
OPT
4
3
EXT
2
1
VOUT1
TRACK2 SEL.
JP6
R18
C13
C9
4.7uF
6.3V
VO2-
150uF
4V
VOUT2
+ COUT6
R15 CPWR
OPT
C8
4.7uF
R32
0
COUT5
OPT
1206
R31
0
VO2+
PRODUCTION
2
1
DESCRIPTION
REVISION HISTORY
REV
OPT
R17
R14
2.2
INTVCC
C20
4.7uF
APPROVALS
C14
OPT
R23
255K
VIN
OPT
0805
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
CUSTOMER NOTICE
SGND
SGND
RUN2
TRKSS2
VFB2
COMP2
SW2
DRVCC
INTVCC
EXTVCC
VOUT2
VOUT2
VOUT2
VOUT2
VOUT2
VOUT2
2
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
PCB DES.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
APP ENG.
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
VIN2
F6
GND
D1
GND
D5
GND
E1
GND
E5
GND
E7
GND
F7
GND
H4
C7
H6
GND
H5
CPWR
GND
B5
GND
H7
B7
VIN2
12
VIN2
E4
A
B
C
D
DEMO MANUAL DC2194A
Schematic Diagram
dc2194af
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
A
B
C
D
5
VOUT1
INTVCC
RUN1
OPT
2512
R35
OPT
R26
OPT
R25
VOUT2
VFB2
RUN2
4
OPTIONAL JUMPER FOR DUAL PHASE SINGLE OUTPUT CONFIGURATION
4
VOUT1
VOUT1
J1
0 Ohm
2010
R27
IOSTEP
10mV / A
J9
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
GL
LT
APPROVALS
C18
OPT
C19
1uF
0805
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
APP ENG.
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
3
2
C17
1uF
2
DATE:
N/A
SIZE
VOUT2
J2
1
GND
IOSTEP CLK
1
DEMO CIRCUIT 2194A
Thursday, January 28, 2016
IC NO.
SHEET 2
HIGH DENSITY, DUAL 4A STEP-DOWN
m MODULE REGULATOR
2
OF 2
REV.
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
E18
LTM4642IY
TECHNOLOGY
R29
10K
E17
VOUT2
VOUT2
DUTY CYCLE 5% MAX
TITLE: SCHEMATIC
R30
0.010
1W
2512
4
Q1
RJK0305DPB
OPT
2010
R28
Load Transient Circuit
CUSTOMER NOTICE
C16
1uF
VOUT1
3
5
3
2
1
5
A
B
C
D
DEMO MANUAL DC2194A
Schematic Diagram
dc2194af
13
DEMO MANUAL DC2194A
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:
This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT
OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete
in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety
measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union
directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.
If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date
of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU
OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS
FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR
ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims
arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all
appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or
agency certified (FCC, UL, CE, etc.).
No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance,
customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.
Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and
observe good laboratory practice standards. Common sense is encouraged.
This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application
engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation
14 Linear Technology Corporation
dc2194af
LT 0216 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2016
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