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DC828A

器件型号:DC828A
器件类别:开发板_开发套件_开发工具   
厂商名称:Analog Devices Inc.
标准:
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器件描述

Power Management IC Development Tools LTC3409EDD Monolithic Synchronous Buck Regulator, 1.6V to 5.5Vin, Jumper Selectable, 1.2, 1.5, 1.8Vout @ 600mA(max)

参数

产品属性属性值
Product AttributeAttribute Value
制造商:
Manufacturer:
Analog Devices Inc.
产品种类:
Product Category:
Power Management IC Development Tools
RoHS:YES
产品:
Product:
Demonstration Boards
类型:
Type:
Voltage Regulators - Switching Regulators
工具用于评估:
Tool Is For Evaluation Of:
LTC3409
Input Voltage:1.6 V to 5.5 V
Output Voltage:1.2 V
Output Current:600 mA
系列:
Series:
LTC3409
商标:
Brand:
Analog Devices
产品类型:
Product Type:
Power Management IC Development Tools
工厂包装数量:
Factory Pack Quantity:
1
子类别:
Subcategory:
Development Tools

DC828A器件文档内容

                       QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 828

                            HIGH EFFICIENCY, LOW PROFILE, SYNCHRONOUS BUCK REGULATOR

                                                                                                                         LTC3409

DESCRIPTION

Demonstration circuit 828 is a step-down converter, us-          pability of the LTC3409, the DC828 can operate at fixed

ing the LTC3409 monolithic synchronous buck regulator.           frequencies of 2.25 MHz or 1.5 MHz, allowing the exclu-

The DC828 has an input voltage range of 1.6V to 5.5V,            sive use of low profile surface-mount components.                   The

and is capable of delivering up to 600mA of output cur-          DC828 can also be clocked by an external oscillator, due

rent at a minimum input voltage of 1.8V.         The output      to a phase-lock loop circuit in the LTC3409.                     These fea-

voltage of the DC828 can be set as low as 0.6V, the ref-         tures, plus the availability of a low profile 8-Lead DFN

erence voltage of the LTC3409.        The DC828 can operate      package, make the DC828 an ideal circuit for use in bat-

in   noise  sensitive  applications,  due  to    the   LTC3409   tery-powered, hand-held applications.

operating in pulse-skipping mode at low load currents.           Design files for this circuit board are available. Call

The DC828 is a high efficiency circuit - over 90%, and           the LTC factory.

during shutdown, the DC828 consumes less than 1uA

typically.  In Burst-ModeTM operation, it consumes only          TM - Burst Mode is a trademark of Linear Technology Corporation

65uA of quiescent current.       Because of the frequency-

select capability of the LTC3409, the DC828 can operate

Table 1.

Performance Summary (TA = 25°C)

PARAMETER                                        CONDITION                                               VALUE

Minimum Input Voltage                                                                                    1.6V

Maximum Input Voltage                                                                                    5.5V

Output Voltage VOUT                            VIN = 1.6V to 5.5V, IOUT1 = 0A to 600 mA                  1.2V ±4%

Typical Output Ripple VOUT                       VIN = 5V, IOUT1 = 600 mA (20 MHz BW)                    20mVP–P

Output Regulation                                Line                                                    ±1%

                                                 Load                                                    ±1%

Nominal Switching Frequency                                                                              1.7 or 2.6 MHz

QUICK START PROCEDURE

The DC828 demonstration board is easy to set up to               NOTE: When              measuring  the  input     or    output   voltage

evaluate the performance of the LTC3409. For proper              ripple, care must be taken to avoid a long ground lead

measurement          equipment   configuration,  set   up   the  on the oscilloscope probe. Measure the input or out-

circuit according to the diagram in Figure 1. Before             put voltage ripple by touching the probe tip directly

proceeding to test, insert jumper JP3 shunt into the             across  the             Vin  or  Vout  and    GND       terminals.  See

off  (lower)  position,      connecting  the     RUN   pin  to   Figure 2 for proper scope probe technique.

ground (GND), which shuts down the circuit.

                                                                                                                                     1
            QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 828

            HIGH EFFICIENCY, LOW PROFILE, SYNCHRONOUS BUCK REGULATOR

1.  Connect the input power supply and the load to the    5. Vary the input voltage from 2.5V to 5.5V and adjust

    board.  Do not hot-plug Vin or increase Vin over      the load current from 0 to 600mA. Vout should

    the rated maximum supply voltage of 5.5V, or the      read between 1.2V +/- 4%.

    part may be damaged.       Refer to figure 1 for the  6. Measure the output ripple voltage at any output

    proper measurement equipment setup.                   current level; it usually will measure less than 20

2.  Insert the shunts in the 1.7 MHz position of jumper   mVAC.

    JP1, in the Burst-Mode position of jumper JP2,        7. Observe the voltage waveform at the switch node

    and in the 1.2V position – jumper JP4.                (pin 6 of the IC or one pin of the inductor).          Verify

3.  Apply 3.3V at Vin.    Measure Vout; it should read    the switching frequency is between 0.9 MHz and

    0V.  If desired, one can measure the shutdown         2.1 MHz (T = 1.111 us and 0.476 us), and that the

    supply current at this point.  The supply current     switch node waveform is rectangular in shape.

    will be approximately 1 uA in shutdown.               When finished, turn off the circuit (connecting the

4.  Turn on the circuit by inserting the shunt in jumper  RUN pin to ground) by inserting the shunt in jumper

    JP3 into the ON (upper) position. The output volt-    JP3 into the OFF (lower) position.

    age should be regulating.  Measure Vout - it should

    measure 1.2V +/- 2%.

Warning - if the power for the demo board is carried in long leads, the input voltage at the part could “ring”.   To

eliminate this, insert a small tantalum capacitor (for instance, an AVX part # TAJT226M010R) on the pads be-

tween the input power and return terminals on the bottom of the demo board.         The (greater) ESR of the tanta-

lum will dampen the (possible) ringing voltage due to the use of long input leads.  On a normal, typical PCB,

with short traces, the capacitor is not needed.

                                                                                                                 2
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 828

HIGH EFFICIENCY, LOW PROFILE, SYNCHRONOUS BUCK REGULATOR

Figure 1. Proper Measurement Equipment Setup

Figure 2. Measuring Input or Output Ripple

                                                          3
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 828

HIGH EFFICIENCY, LOW PROFILE, SYNCHRONOUS BUCK REGULATOR

Figure 3. Load Step Response

Vin – 1.8V  Vout – 1.2V

Iout Step – 500 mA

Trace 1: Output Voltage (100 mV/div AC)

Trace 2: Output Current (500 mA/div)

                                                          4
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 828

HIGH EFFICIENCY, LOW PROFILE, SYNCHRONOUS BUCK REGULATOR

                                                          5
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DC828A

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