ISL6549IBZ-T Datasheet ISL6549CBZ, ISL6549CRZ-T, ISL6549CRZ | P4-P6

FN9168.2

September 22, 2006

ISL6549

Absolute Maximum Ratings Thermal Information

VCC12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .GND - 0.3V to +14V

PVCC5, VCC5 . . . . . . . . . . . . . . . . . . . . . . . . . . .GND - 0.3V to +7V

VCC5 (if used with external supply). . . . . . . . . . .GND - 0.3V to +6V

BOOT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .GND - 0.3V to +27V

PHASE. . . . . . . . . . . . . . . . . . . . . . . . V

BOOT

- 7V to V

BOOT

+ 0.3V

BOOT

- V

PHASE

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+7V

UGATE. . . . . . . . . . . . . . . . . . . . . . V

PHASE

- 0.3V to V

BOOT

+ 0.3V

LGATE . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to PVCC5 + 0.3V

LDO_DR . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to VCC12 + 0.3V

FB, LDO_FB, COMP, FS_DIS . . . . . . . GND - 0.3V to VCC5 + 0.3V

ESD Classification

Human Body Model (Per JESD22-A114C) . . . . . . . . . . . . . .Class 2

Machine Model (Per EIA/JESD22-A115-A) . . . . . . . . . . . . . .Class B

Charge Device Model (Per JESD22-C101C). . . . . . . . . . . . Class IV

Thermal Resistance θ

(°C/W) θ

(°C/W)

SOIC Package (Note 1) . . . . . . . . . . . . 105 N/A

QFN Package (Notes 2, 3). . . . . . . . . . 52 14

QSOP Package (Note 1) . . . . . . . . . . . 110 N/A

Maximum Junction Temperature (Plastic Package) . . . . . . +150°C

Maximum Storage Temperature Range. . . . . . . . . -65°C to +150°C

Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . +300°C

(SOIC - Lead Tips Only)

Recommended Operating Conditions

External Supply Voltage on VCC5. . . . . . . . . . . . . . . . . . +5.0V ±5%

Supply Voltage on VCC12 . . . . . . . . . . . . . . . . . . . . . . . +12V ±10%

Ambient Temperature Range (C). . . . . . . . . . . . . . . . . . 0°C to 70°C

Ambient Temperature Range (I) . . . . . . . . . . . . . . . . -40°C to +85°

Junction Temperature Range. . . . . . . . . . . . . . . . . . . 0°C to +125°C

CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the

device at these or any other conditions above those indicated in the operational sections of this specification is not implied.

NOTES:

1. θ

is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details.

2. θ

is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See

Tech Brief TB379.

3. For θ

, the “case temp” location is the center of the exposed metal pad on the package underside.

Electrical Specifications Recommended Operating Conditions, unless otherwise noted. VCC12 = 12V

Temperature = 0 to +70°C (typical = +25°C) for Commercial; Temperature = -40 to + 85°C (typical = +25°C) for

Industrial. Refer to Block Diagram, Simplified Power System Diagram, and Typical Application Schematic.

PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNITS

VCC SUPPLY CURRENT

Nominal Supply Current VCC12 (disabled) I

CC12 dis

UGATE, LGATE and LDO_DR open;

FS_DIS = GND

23mA

Nominal Supply Current VCC5 (disabled) I

CC5 dis

UGATE, LGATE and LDO_DR open;

FS_DIS = GND (Note 4)

57.5mA

Nominal Supply Current VCC12

(includes PVCC5 current)

CC12

UGATE, LGATE and LDO_DR open;

OSC

= 620kHz

12 18 mA

Nominal Supply Current VCC5 I

CC5

UGATE, LGATE and LDO_DR open;

OSC

= 620kHz

46mA

Maximum PVCC5 Current Available (Note 5) I

PVCC5

100 mA

VCC12 to PVCC5 Current Limit (Note 5) I

PVCC5CL

150 mA

PVCC5 Voltage V

PVCC5

ISL6549C; No external load 4.95 5.25 5.8 V

ISL6549I; No external load 4.85 5.25 5.8

POWER-ON RESET

Rising VCC5 Threshold VCC12 = 12V 3.7 4.2 4.5 V

Falling VCC5 Threshold VCC12 = 12V 3.3 3.8 4.1 V

Rising VCC12 Threshold VCC5 = 5V 8.8 9.5 10.0 V

Falling VCC12 Threshold VCC5 = 5V 7.0 7.5 8.0 V

OSCILLATOR AND SOFT-START

Switching Frequency F

OSC

ISL6549C; R

FS_DIS

= 45.3kΩ 540 620 700 kHz

ISL6549I; R

FS_DIS

= 45.3kΩ 525 620 700 kHz

FN9168.2

September 22, 2006

ISL6549

Sawtooth Amplitude (Note 6) DV

OSC

1.5 V

Soft-Start Interval T

OSC

= 620kHz 6.8 ms

REFERENCE VOLTAGE

Reference Voltage V

REF

ISL6549C; For Error Amp 1 and 2 0.792 0.8 0.808 V

ISL6549I; For Error Amp 1 and 2 0.788 0.8 0.812 V

PWM CONTROLLER ERROR AMPLIFIER

DC Gain (Note 6) R

= 10K, C

= 10pF 96 dB

Gain-Bandwidth Product (Note 6) GBWP R

= 10K, C

= 10pF 20 MHz

Slew Rate (Note 6) SR R

= 10K, C

= 10pF 8 V/µs

FB Input Current ⎜I

⎜ V

= 0.8V 0.1 1.0 µA

COMP High Output Voltage V

OUT

High 4.8 V

COMP Low Output Voltage V

OUT

Low 0.6 V

COMP High Output, Source Current I

OUT

High -2.8 mA

Undervoltage Level (V

REF

70 75 80 %

PWM CONTROLLER GATE DRIVERS

UGATE Maximum Voltage V

HUGATE

VCC12 = 12V; PHASE = 12V 17 17.5 18

LGATE Maximum Voltage V

HLGATE

VCC12 = 12V; based on PVCC5 voltage 5.25 6 V

UGATE and LGATE Minimum Voltage V

LGATE

VCC12 = 12V; PHASE = 0V 0 0.5 V

UGATE Source Output Impedance R

DS(ON)

VCC12 = 12V; I

GATE

= 100mA 0.8 Ω

UGATE Sink Output Impedance R

DS(ON)

VCC12 = 12V; I

GATE

= 100mA 0.7 Ω

LGATE Source Output Impedance R

DS(ON)

VCC12 = 12V; I

GATE

= 100mA 0.8 Ω

LGATE Sink Output Impedance R

DS(ON)

VCC12 = 12V; I

GATE

= 100mA 0.4 Ω

LINEAR REGULATOR (LDO_DR)

DC Gain (Note 6) Gain R

= 10K, C

= 10pF 100 dB

Gain-Bandwidth Product (Note 6) GBWP R

= 10K, C

= 10pF 2 MHz

Slew Rate (Note 6) SR R

= 10K, C

= 10pF 6 V/µs

LDO_FB Input Current ⎜I

⎜ V

LDO_FB

= 0.8V 0.1 1.0 µA

LDO_DR High Output Voltage V

OUT

High VCC12 = 12V 11.0 11.5 V

LDO_DR Low Output Voltage V

OUT

Low 0.0 0.5 V

LDO_DR High Output Source Current I

OUT

High V

OUT

= 2.0V 2.0 mA

LDO_DR Low Output Sink Current I

OUT

Low 0.5 mA

Undervoltage Level (V

LDO_FB

REF

Percent of Nominal 70 75 80 %

NOTES:

4. Current in VCC5 is actually higher disabled, due to extra current required to pull down against the FS_DIS pin. VCC12 current is lower disabled.

5. Guaranteed by design, not production tested. Exceeding the maximum current from PVCC5 may result in degraded performance and unsafe

operation.

6. Guaranteed by design, not production tested.

Electrical Specifications Recommended Operating Conditions, unless otherwise noted. VCC12 = 12V

Temperature = 0 to +70°C (typical = +25°C) for Commercial; Temperature = -40 to + 85°C (typical = +25°C) for

Industrial. Refer to Block Diagram, Simplified Power System Diagram, and Typical Application Schematic.

(Continued)

PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNITS

FN9168.2

September 22, 2006

Functional Pin Description

VCC12

This is the power supply pin for the IC; it sources the internal

5V regulator used for the gate drivers. Provide a local

decoupling capacitor to GND. The voltage at this pin is

monitored for Power-On Reset (POR) purposes. The

16 Ld QFN and 16 Ld QSOP have two VCC12 pins; tie them

together on the board.

VCC5

This pin supplies the internal 5V bias for analog and logic

functions. Provide a local decoupling capacitor to GND, and a

resistor to PVCC. The voltage at this pin is monitored for

Power-On Reset (POR) purposes. See “Internal PVCC5

Regulator” on page 7 for more details.

GND, AGND, DGND

These pins are the signal ground for the IC. All voltage levels

are measured with respect to these pins. Connect all to the

ground plane via the shortest available path.

PVCC5

This pin is the internal 5V linear regulator for the BOOT supply

(for the UGATE driver), and the source for the LGATE.

Provide a local decoupling capacitor to PGND. Do not use this

pin as a voltage source for other circuits. See “Internal PVCC5

Regulator” on page 7 for more details.

PGND

This pin is the power ground return for the lower gate driver.

(LGATE). Connect to the ground plane on the board via the

shortest available path.

UGATE

This output pin drives the upper MOSFET gate from the

internal 5V regulator. Connect it to the gate of the upper

MOSFET via a short, low inductance trace.

BOOT

The BOOT pin, along with the external capacitor (from

PHASE to BOOT), an internal diode, and the internal 5.5V

regulator, creates the bootstrap voltage for the upper gate

driver (UGATE). The maximum voltage is around 5.5V (above

PHASE).

PHASE

This pin represents the return path for the upper gate drive.

Connect it to the source of the upper MOSFET via a short, low

inductance trace.

LGATE

This output pin drives the lower MOSFET gate from the

internal 5V regulator. Connect it to the gate of the lower

MOSFET via a short, low inductance trace.

FB is the available external inverting input pin of the error

amplifier. Connect the output of the switching regulator to

this pin through a properly sized resistor divider, to set the

output voltage. The voltage at this pin is regulated to the

internal reference voltage. This pin is also monitored for

undervoltage detection.

COMP

COMP is the available external output pin of the error amplifier.

This pin is used to compensate the voltage-mode control

feedback loop of the standard synchronous rectified buck

converter. Connect an appropriate compensation network

between this and the FB pin. See “PWM Controller Feedback

Compensation” on page 10 for more information.

FS_DIS

This input pin has two functions. A resistor to GND sets the

internal oscillator frequency for the switching regulator. In

addition, if the pin is pulled down towards GND with a low

impedance (<1kΩ, such as an external FET), it will disable

both regulator outputs until released (at which time a new soft-

start cycle will begin).

LDO_DR

This output pin provides the gate voltage for the linear

regulator pass transistor. Connect this pin to the gate terminal

of an external N-channel MOSFET transistor. This pin (along

with the LDO_FB pin) also provides a means of compensating

the error amplifier, should the application require it.

LDO_FB

This input pin is the FB inverting input on the linear regulator

error amplifier. Connect the output of the linear regulator to

this pin through a properly sized resistor divider, to set the

output voltage. The voltage at this pin is regulated to the

internal reference voltage. This pin is also monitored for

undervoltage detection.

Bottom Pad (QFN Package Only)

The QFN package’s metal bottom pad is resistively tied to the

internal IC GND. For best thermal and electrical performance,

connect this pad to the GND pins, and to the ground plane of

the PCB through 4 vias equidistantly situated inside the solder

landing pad.

ISL6549

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18

ISL6549IBZ-T

Mfr. #:

Buy ISL6549IBZ-T

Manufacturer:

Renesas / Intersil

Description:

Switching Controllers SINGLE 12V SUPPLY DLG 14LD N

Lifecycle:

New from this manufacturer.

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ISL6549IBZ-T

ISL6549IBZ-T

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