DC1594A-B Datasheet DC1594A-B | P1-P3

LTC4219

DESCRIPTION

Demonstration circuit DC1594A is a +5V or +12V rail

with hot swap functionality featuring the LTC4219 - 5A

Integrated Hot Swap Controller. As a Controller has two

dedicated voltage versions- for 5.0V and 12V operation-

the DC1594 also has similar variation-DC1594A-A (5.0V)

and DC1594A-B ((12V). The DC1594A allows evaluating

performance of the LTC4219 in the transient conditions,

such as turning on and off the power rail, in the steady

state conditions with different load and in the fault condi-

tions, when Controller interrupts its functions from over-

current, nonproprietary voltage level, or thermal condi-

tion.

The LTC4219 features 5% accuracy in 5.4A current limit

and has a current limiting foldback characteristic. Current

limit can be reduced by placing the external resistor be-

tween Iset and GND pins, and it can be adjusted dynami-

cally during transient.

The Controller monitors a load current generating ground

reference signal proportional to the sense resistor volt-

age. Thermal limit and power good signaling increase

Controller reliability and options in application.

Design files for this circuit board are available. Call

the LTC factory.

, LTC, LTM, LT, Burst Mode, OPTI-LOOP, Over-The-Top and PolyPhase are registered

trademarks of Linear Technology Corporation. Adaptive Power, C-Load, DirectSense, Easy

Drive, FilterCAD, Hot Swap, LinearView, µModule, Micropower SwitcherCAD, Multimode

Dimming, No Latency ∆Σ, No Latency Delta-Sigma, No R

SENSE

, Operational Filter, PanelPro-

tect, PowerPath, PowerSOT, SmartStart, SoftSpan, Stage Shedding, SwitcherCAD, ThinSOT,

UltraFast and VLDO are trademarks of Linear Technology Corporation. Other product names

may be trademarks of the companies that manufacture the products.

PERFORMANCE SUMMARY

Specifications are at TA = 25°C

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

Input Supply Range

2.9 15

DD(UVL)

Input Supply Undervoltage Lockout V

Rising 2.65 2.73 2.85

LTC4219-12 Only V

OUT

Rising 10.2 10.5 10.8 VoV

OUT(PGTH))

Output Power Good Threshold

LTC4219-5 Only V

OUT

Rising

4.2 4.35 4.5

LTC4219-12 Only

127 170 213 mV

OUT(PGHYST)

Output Power Good Hysteresis

LTC4219-5 Only 53 71 89

∆

GATE/

∆

GATE Pin Turn-On Ramp Rate 0.15 0.3 0.55

µA

MOSFET+Sense Resistor ON Resistance

15 33 50 m

Ω

= 1.23V 5.0 5.4 5.8

= 0V 1.0 1.4 1.9

LIM(TH)

Current Limit Threshold

= 1.23V, R

SET

= 20k

Ω

2.3 2.7 3.2

TIMER(H)

TIMER Pin High Threshold V

TIMER

Rising

1.2

1.235 1.28

TIMER(L)

TIMER Pin Low Threshold V

TIMER

Falling

0.1

0.21 0.3

TIMER(UP)

TIMER Pin Pull-Up Current V

TIMER

=0 80 100 120

µA

TIMER(DN)

TIMER Pin Pull-Down Current V

TIMER

=1.2V 1.4 2 2.6 µ

TIMER(RATIO)

TIMER Pin Current Ratio I

TIMER(DN)/

TIMER(UP)

1.6 2 2.7 %

DEMO

CIRCUIT

1594

QUICK START GUIDE

LTC4219

5A Integrated Hot Swap Controller

LTC4219

OPERATING PRINCIPLES

The LTC4219A-12 and LTC4219A-5 are suited accord-

ingly for 12V and 5V power control in applications for hot

board insertion or removal with electronic circuit breaker

function, foldback current limiting, load current monitor-

ing, power good and fault signaling. The LTC4219A has a

rich set of features to support hot swap applications in-

cluding:

■

5% Accurate Current Limit for 5.4A,,

■

Adjustable Current Limit for lower than 5.4A,

■

Adjustable Inrush Current Control,

■

Load Current Monitoring,

■

Adjustable duration for Current Limit before switch is

turned off,

■

Power good and Fault signaling.

QUICK START PROCEDURE

The Demo Board DC1594A includes the LTC4219-12 or

LTC4219-5 5A Integrated Hot Swap Controller, four LEDs

to indicate input and output voltages (D2, D4), and the

state of the fault (D3) and Power Good (D5) pins, three

jumpers, and a few associated components.

Demonstration circuit DC1594A is easy to set up to

evaluate the performance of the LTC4219. Refer to

Error!

Reference source not found.

for proper measurement

equipment setup and follow the procedure below:

The performance evaluation for LTC4219-12 and

LTC4219-5 is identical. The difference is in a value of the

loading components and power supply voltage.

Place jumpers in the following positions:

OFF,

EN1

DISABLE,

EN2

ENABLE.

With power off, connect the power supply termi-

nals to the VDD (E1) and GND (E3) turrets.

In all evaluations steps the Demo Board is con-

nected to the appropriative power supply (+12V or

+5.0V), Controller is turned on by replacing the

jumper head JP2 position from the DISABLE to the

ENABLE, and a resetting Controller is achieved by

first placing the jumper head JP2 on the DISABLE

position and then on the ENABLE.

Place a scope probe to the output turret, turn on

the Controller, and measure a power-up time with no

load. For LTC4219-12 this time must be in the range

(22.0-80.0) ms, and for LTC4219-5 - (9.0-34) ms.

Connect a Low Capacitive Load (5600uf for both

Controllers-LTC4219-12 and LTC4219-5) to the out-

put of hot swap circuitry (OUT turret). Turn on the

controller. This power up should be successful and

two LEDs (OUT –green- and PG -orange) lights must

indicate this.

Connect a High Reset Capacitive Load (6800uf for

both Controllers-LTC4219-12 and LTC4219-5) to the

output of hot swap circuitry. Turn on a controller.

This power up should be unsuccessful, and no light

of the two LEDs, - OUT and PG,- and the light of the

FLT

LED (red) confirms this. Reset controller after a

fault.

Load the output with a Low Resistive Load (2.5

Ohms for LTC4219-12 and 1.1 Ohms for LTC4219-

5) and turn the controller on. Controller should suc-

cessfully keep this load. Verify performance of the

current monitoring.

Load the output with a High Resistive Load (2.0

Ohms for LTC4219-12 and 0.8 Ohms for LTC4219-

5) and turn the controller on. Controller should fail to

keep this load. Reset Controller after a fault.

Pay special attention to the MOSFET Safe operat-

ing Area, when TIMER period is changed.

JP1

JP2

LTC4219

Figure 1.

Proper Equipment Measurement Set-Up

P1-P3 P4-P4

DC1594A-B

Mfr. #:

Buy DC1594A-B

Manufacturer:

Analog Devices Inc.

Description:

Power Management IC Development Tools LTC4219-5 5V, 5A Integrated Hot Swap Con

Lifecycle:

New from this manufacturer.

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DC1594A-B