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Linear Technology LTC3265EDHC Demo Manual

Low noise dual supply with boost and inverting charge pumps
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DESCRIPTION
Demonstration Circuit 2235A has boost and inverting
charge pumps each with a low noise LDO post regulator
featuring the
LTC
®
an input voltage from 4.5V to 16V for the boost charge
pump and from 4.5V to 32V for the inverting charge pump.
The demo board provides selectable LDO
nitudes of 5V, 15V, and 24V for each polarity. The demo
board also provides the means to select between low power
Burst Mode
operation or low noise constant-frequency
®
PERFORMANCE SUMMARY
SYMBOL
PARAMETER
V
V
Input Voltage Range
IN_P
IN_P
V
V
Input Voltage Range
IN_N
IN_N
+
+
V
LDO
Output Voltage
LDO
–
–
V
LDO
Output Voltage
LDO
+
+
V
V
Output Voltage Range
OUT
OUT
–
–
V
V
Output Voltage Range
OUT
OUT
BOARD PHOTO
Arrow.com.
Downloaded from
3265EDHC. The LTC3265 operates with
±
output set mag-
CONDITIONS
V
• 2 ≥ LDO
IN_P
V
≤ LDO
IN_N
MODE = 0V (Const. Freq.)
MODE ≥ 2V (Burst)
MODE = 0V (Const. Freq.)
MODE ≥ 2V (Burst)
DEMO MANUAL DC2235A
Low Noise Dual Supply with Boost
and Inverting Charge Pumps
mode operation, plus select an operating frequency of
500kHz, 200kHz, or 50kHz.
The LTC3265 data sheet gives a complete description of
the device, operation and application information. The data
sheet must be read in conjunction with this demo manual.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2235A
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
Specifications are at T
= 25°C
A
MIN
4.5
4.5
+
Set Point + 0.8V
1.2
–
Set Point – 0.5V
–32
LTC3265EDHC
TYP
MAX
16
32
32
–1.2
V
• 2
IN_P
0.94 • V
• 2
IN_P
–V
IN_N
–0.94 • V
IN_N
UNITS
V
V
V
V
V
V
V
V
dc2235af
1

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Summary of Contents for Linear Technology LTC3265EDHC

  • Page 1 Burst Mode operation or low noise constant-frequency ® L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. PERFORMANCE SUMMARY Specifications are at T = 25°C...

  • Page 2: Typical Applications

    DEMO MANUAL DC2235A TYPICAL APPLICATIONS ± Low Noise ±15V Outputs from a Single 12V Input LDO Rejection of V Ripple 1µF 10mV/DIV AC-COUPLED – CBST CBST IN_N 10mV/DIV 10µF AC-COUPLED – +15V IN_P 10mV/DIV 10µF 10µF LTC3265 604K AC-COUPLED – –...
  • Page 3 DEMO MANUAL DC2235A QUICK START PROCEDURE 16. Slowly increase the load on V to 100mA and ob- 22. Set the load on V to 0mA. serve the output ripple and output voltage on V – 23. Slowly increase the load on V to –50mA and ob- –...

  • Page 4: Applications Information

    DEMO MANUAL DC2235A QUICK START PROCEDURE Figure 2. Measuring Input or Output Ripple APPLICATIONS INFORMATION Figure 3 illustrates the voltage loss from the ideal boost the ideal inverting charge pump output voltage of –V IN_N – charge pump output voltage of 2 • V to the measured to the measured V voltage.
  • Page 5 500kHz oscillator emissions respectively. The data were collected in a frequency. Linear Technology has made every effort to GTEM chamber and using a CISPR25 LISN for conducted provide useful and accurate EMI data, but it remains the emissions.

  • Page 6: Parts List

    VISHAY, CRCW0402604KFKED R11, R12 RES 52.3kΩ 1/16W 1% 0402 SMD VISHAY, CRCW040252K3FKED LOW NOISE DUAL SUPPLY WITH BOOST AND LINEAR TECH., LTC3265EDHC#PBF INVERTING CHARGE PUMPS Additional Demo Board Circuit Components CAP, CHIP, X7R,10µF, ±10%, 25V, 1206 WURTH, 885012208069 C5, C7, C9 (OPT)

  • Page 7: Schematic Diagram

    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 8 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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