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Linear Technology 1033B Demo Manual

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DESCRIPTION
Demonstration circuit 1033B features the
cropower, multipurpose, pushbutton On/Off PowerPath™
controller that provides voltage monitoring and supervisory
features, as well as ideal diode power paths. Selectable
PowerPath management modes allow a variety of power
on and off configurations, including pushbutton on/off
control and voltage detection on/off control.
The LTC2952's pushbutton input has independently pro-
grammable ON and OFF de-bounce times. A simple micro-
processor interface allows for proper system housekeeping
prior to power down. The status of digital pins G1STAT,
PFO, RST and INT are displayed with LEDs. Under system
fault conditions, the part's internal KILL timer ensures that
the system can be shut down. High reliability systems may
PERFORMANCE SUMMARY
PARAMETER
Input Voltage Range
Output Voltage V
S
DC/DC Out 2P6V
V2 Trip Threshold
Power Fail Input Voltage PFI
Voltage Monitor VM
Pushbutton On Time ONT
Pushbutton Off Time OFFT
* V
will be the ideal diode OR of V1 and V2. There is only a slight voltage drop across the ideal diode.
S
Arrow.com.
Downloaded from
LTC
2952, a mi-
utilize the LTC2952's power fail, voltage monitoring, diode
©
status, watchdog and μP reset features to monitor power
status and ensure system integrity.
The DC1033B operates over the full LTC2952 range of 2.7V
to 28V to accommodate a wide variety of input power sup-
plies. Low forward drop ideal diodes and very low standby
current (25μA typ) make the LTC2952 ideally suited for
battery powered or power conscious applications.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1033B
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
Specifications are at T
CONDITIONS
V1 and/or V2
Configuration A
Configuration B
Configuration C, Pushbutton Enable On
Configuration D, Pushbutton Enable On, V2 > V2 Threshold
Configuration A-D, Pushbutton Enable On
Default Resistors (R9 and R10), JP2 Set to Monitor V2
Default Resistors (R3 and R4) Monitor V
Resistor Options (R17 and R4) Set to Monitor V2
Default Resistors (R1 and R2) Monitor 2P6V
Resistor Options (R16 and R2) Set to Monitor V
JP3 Set to OPEN, LTC2952 Default ONT
JP3 Set to CAP to Connect 22nF to ONT Pin
JP4 Set to OPEN, LTC2952 Default OFFT
JP4 Set to CAP to Connect 68nF to OFFT Pin
DEMO MANUAL DC1033B
Pushbutton On/Off
Power Path Controller
= 25°C
A
VALUE
2.7V to 28V
V1 or V2*
V1 or V2*
V1 or V2*
V1 or V2*
2.6V
4.725V
3.055V
S
3.055V
2.325V
3.055V
S
26ms
26ms + 205ms
26ms
26ms + 632ms
LTC2952
dc1033bf
1

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Summary of Contents for Linear Technology 1033B

  • Page 1 The status of digital pins G1STAT, L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and PFO, RST and INT are displayed with LEDs. Under system PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the fault conditions, the part’s internal KILL timer ensures that...
  • Page 2 2. Connect a voltmeter across V and GND. Demonstration circuit 1033B is easy to set up to evaluate the 3. Apply a voltage of 2.7V to 28V across V2 (WALL). performance of the LTC2952. Refer to Figure 1 for proper 4.
  • Page 3 DEMO MANUAL DC1033B OPERATING PRINCIPLES The DC1033B operates from 2.7V to 28V applied to either for V2 is turned on always, while the ideal diode for V1 V1 or V2. Configuration of M1 and M2 of the LTC2952 is shutdown, even if V1 is greater than V2. V will then determines the power path to the output voltage and the equal V2 minus the ideal diode voltage drop.
  • Page 4 DEMO MANUAL DC1033B OPERATING PRINCIPLES ONT/OFFT PROGRAMMING VOLTAGE MONITORS PFI AND VM Additional pushbutton turn on and off de-bounce time Voltage monitoring is also provided by the Power Fail can be set by attaching a capacitor from the ONT and Input (PFI) and Voltage Monitor (VM) pins.
  • Page 5 DEMO MANUAL DC1033B OPERATING PRINCIPLES Figure 3. Pushbutton Turn ON with 22nF at ONT Figure 4. Pushbutton Turn OFF with No Additional Timing Figure 5. Pushbutton Turn OFF with 68nF at OFFT dc1033bf Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from Downloaded from...
  • Page 6 DEMO MANUAL DC1033B OPERATING PRINCIPLES Figure 6. Pushbutton Turn OFF with No WDE Extension Figure 7. Pushbutton Turn OFF with Transitions at WDE for Time Extension dc1033bf Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from...
  • Page 7 DEMO MANUAL DC1033B PCB LAYOUT Top Layer Layer 2 dc1033bf Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from...
  • Page 8 DEMO MANUAL DC1033B PCB LAYOUT Layer 3 Bottom Layer dc1033bf Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from...
  • Page 9 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 representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
  • Page 10 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.

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