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Linear Technology LTC4232 Demo Manual

5a integrated, hot swap controller
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DESCRIPTION
Demonstration circuit 1886B features the
the
LTC4232-1
5A integrated Hot Swap™ controllers. The
LTC4232 is ideally suited for demanding power distribution
control in 2.9V to 15V applications for hot board inser-
tion protection, high side power switching, and electronic
circuit breaker functions. The LTC4232 provides a rich set
of features to support Hot Swap applications including:
• 2% accurate undervoltage and overvoltage comparators
• Thermal protection
• Adjustable inrush current control
• Adjustable, 10% accurate current limit with program-
mable cutout time
• Foldback current limiting
• Programmable output voltage ramp rate
• Configurable auto-retry or latchoff on overcurrent faults
• Power good and fault outputs
• Debounce time during supply turn-on
PERFORMANCE SUMMARY
SYMBOL
PARAMETER
V
Board Input Supply Range
DD
dV
/dt
GATE Pin Turn-On Ramp Rate
GATE
R
MOSFET + Sense Resistor On-Resistance
ON
I
Current Limit Threshold
LIM(TH)
V
OV, UV, FB Pin Threshold Voltage
TH
V
UV Pin Reset Threshold Voltage
UV(RTH)
V
FB Pin Power Good Hysteresis
FB(HYST)
t
Auto-Retry Turn-On Delay (Internal)
D(AUTO-RETRY)
T
Timer Period for ADJUSTABLE Option
ADJUST
DEMO MANUAL DC1886B
LTC4232 and LTC4232-1:
LTC4232
and
The LTC4232 debounce time is 100ms, while the LTC4232-1
is 16ms. Both are available in a 16-lead 5mm × 3mm DFN
package. The LTC4232 is showcased on demonstration
circuit 1886B-A. The LTC4232-1 is installed on DC1886B-B.
Both demo boards are configured for 12V application. By
changing a few passive components, 2.9V to 15V applica-
tions can be easily evaluated.
The LTC4232 has limited output voltage slew rate with
a typical value of 300V/s, while the LTC4232-1 does not
have a special circuit to limit this parameter. The natural
(maximum) gate voltage slew rate (S
is defined by the internal MOSFET C
capacitance) value and gate driver current capability. It is
48000V/s as a typical value.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1886B
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
(T
= 25°C)
A
CONDITIONS
Min Is UV, Max Is OV
LTC4232
LTC4232-1 with 10nF GATE Capacitor
V
= 1.23V, No R
FB
SET
V
= 0V
FB
V
= 1.23V, R
= 20k
FB
SET
V
Rising
IN
V
Falling
UV
LTC4232
LTC4232-1
LTC4232
LTC4232-1
5A Integrated
Hot Swap Controller
) of the LTC4232-1
N
RSS
MIN
TYP
9.2
12
0.15
0.3
1.7
2.4
15
33
5.0
5.6
1.2
1.5
2.6
2.9
1.21
1.235
0.55
0.62
10
20
50
100
8
16
9.5
12.3
0.95
1.23
(reverse transfer
MAX
UNITS
15.1
V
0.55
V/ms
3.5
V/ms
50
mΩ
6.1
A
1.8
A
3.3
A
1.26
V
0.7
V
30
mV
150
ms
24
ms
16.8
ms
1.68
ms
dc1886bfa
1

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Summary of Contents for Linear Technology LTC4232

  • Page 1 • Configurable auto-retry or latchoff on overcurrent faults L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners.

  • Page 2: Jumpers And Leds

    2ms timer period (FIXED 2ms not recom- characteristic) can power the load only during a very short mended for LTC4232-1 during auto-retry) or ADJUST- time, and the MOSFET will experience the maximum cur- ABLE determined by TIMER capacitor C1 (12ms for rent limit for almost all of the remaining power up period.

  • Page 3: Quick Start Procedure

    LTC4232 or LTC4232-1. Refer to without a load connected. It should take from 22ms Figure 1 for the proper measurement equipment setup to 80ms for LTC4232, and from 3.0ms to 7.0ms for and follow the procedure below. LTC4232-1.

  • Page 4: Parts List

    DEMO MANUAL DC1886B PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components CIN1, COUT2 CAP ., SANYO\16X25\H COUT1 CAP ., TANT, 22µF 25V, 20%, 7343 AVX, TPSD226M025R0200 CAP ., X5R, 1µF 25V, 0603 AVX, 06033D105KAT2A DIODE, 400W TRANSIENT VOLTAGE DIODES INC., SMAJ22A-13-F SUPPRESSOR, SMA-DIODE D2, D4...

  • Page 5: 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 6 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.

This manual is also suitable for:

Ltc4232-1

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