ISL78200AVEZ INTERSIL [Intersil Corporation], ISL78200AVEZ Datasheet

ISL78200AVEZ

Manufacturer Part Number

ISL78200AVEZ

Description

2.5A Regulator with Integrated High-Side MOSFET for Synchronous Buck or Boost Buck Converter

Manufacturer

INTERSIL [Intersil Corporation]

Datasheet

1.ISL78200AVEZ.pdf (19 pages)

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2.5A Regulator with Integrated High-Side MOSFET for

Synchronous Buck or Boost Buck Converter

ISL78200

The ISL78200 is a synchronous buck controller with a 90mΩ

high side MOSFET and low side driver integrated. The ISL78200

supports a wide input voltage range from 3V to 40V. Regarding

the output current capability, the ISL78200 can typically support

a continuous load of 2.5A under conditions of 5V V

range of 8V to 36V, 500kHz, +85°C ambient temperature with

still air. For any specific application, the actual maximum output

current depends upon the die temperature not exceeding

+125°C with the power dissipated in the IC, which is related to

input voltage, output voltage, duty cycle, switching frequency,

ambient temperature and board layout, etc. Refer to the Output

Current section on page 14 for more details.

The ISL78200 has flexible selection of operation modes of

forced PWM mode and PFM mode. In PFM mode, the

quiescent input current is as low as 300µA and can be further

reduced to 180µA with AUXVCC connected to V

and PWM can be programmed to cover wide applications.

The low side driver can be either used to drive an external low

side MOSFET for a synchronous buck, or left unused for a

standard non-synchronous buck. The low side driver can also

be used to drive a boost converter as a pre-regulator that

greatly expands the operating input voltage range down to 3V

or lower (refer to “Typical Application Schematic III - Boost

Buck Converters” on page 5).

The ISL78200 offers the most robust current protections. It

uses peak current mode control with cycle-by-cycle current

limiting. It is implemented with frequency foldback under

current limit condition; in addition, the hiccup overcurrent

mode is also implemented to guarantee reliable operations

under harsh short conditions.

The ISL78200 has comprehensive protections against various faults

including overvoltage and over-temperature protections, etc.

September 22, 2011

FN7641.0

and 5V V

SGND

PGOOD

MODE

SYNC

AUXVCC

EXT_BOOST

VCC

ILIMIT

OUT

application. The load boundary between PFM

FIGURE 1. TYPICAL APPLICATION

ISL78200

COMP

PHASE

LGATE

BOOT

PGND

VIN

OUT

V IN

under 12V

, V

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

V OUT

1-888-INTERSIL or 1-888-468-3774

Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.

Features

• Ultra Wide Input Voltage Range 3V to 40V

• Selectable Mode Operation

• 300µA IC Quiescent Current (PFM, No Load); 180µA Input

• Less than 3µA Standby Input Current (IC Disabled)

• Operational Topologies

• Programmable Frequency from 200kHz - 2.2MHz and

•

• Reliable Cycle by Cycle Overcurrent Protection

• 20 Ld HTSSOP Package

• Pb-Free (RoHS Compliant)

Applications

• Automotive Applications

• General Purpose Power Regulator

• 24V Bus Power

• Battery Power

• Embedded Processor and I/O Supplies

FIGURE 2. EFFICIENCY, SYNCHRONOUS BUCK, PFM MODE,

100

- Forced PWM Mode

- PFM Mode

- Programmable Current Boundary between PFM and PWM

Quiescent Current (PFM, No Load, V

- Synchronous Buck

- Non-Synchronous Buck

- Two Stage Boost Buck

Frequency Synchronization Capability

- Temperature Compensated Current Sense

- Frequency Foldback

- Programmable OC Limit

- Hiccup Mode Protection in Worst Case Short Condition

1% Tight Voltage Regulation Accuracy

0.1m

Modes

All other trademarks mentioned are the property of their respective owners.

OUT

12V V

5V, T

6V V

= +25°C

LOAD CURRENT (A)

10m

24V V

OUT

100m

Connected to AUXVCC)

40V V

2.5

Related parts for ISL78200AVEZ

ISL78200AVEZ Summary of contents

Page 1

Regulator with Integrated High-Side MOSFET for Synchronous Buck or Boost Buck Converter ISL78200 The ISL78200 is a synchronous buck controller with a 90mΩ high side MOSFET and low side driver integrated. The ISL78200 supports a wide input voltage range ...

Page 2

Pin Configuration Functional Pin Description PIN NAME PIN # PGND 1 This pin is used as the ground connection of the power flow including driver. BOOT 2 This pin provides bias voltage to the high-side MOSFET driver. A bootstrap circuit ...

Page 3

... Ordering Information PART NUMBER (Notes ISL78200AVEZ ISL78200 AVEZ NOTES: 1. Add “-T*” suffix for tape and reel. Please refer to 2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations) ...

Page 4

Block Diagram VCC VIN BIAS LDO POWER-ON SGND RESET EN EXT_BOOST MODE PFM/FPWM SYNC FS OSCILLATOR SOFT-START VCC LOGIC 5 µ AUXVCC AUXILARY LDO OCP, OVP, OTP PFM LOGIC BOOST MODE CONTROL VOLTAGE MONITOR SLOPE COMPENSATION + 0.8V ...

Page 5

Typical Application Schematic I PGOOD EN VIN MODE SYNC BOOT AUXVCC VCC ISL78200 PHASE ILIMIT LGATE SS PGND EXT_BOOST FB FS SGND COMP FIGURE 3A. SYNCHRONOUS BUCK Typical Application Schematic PGOOD EN VIN MODE SYNC BOOT AUXVCC ...

Page 6

Absolute Maximum Ratings VIN, PHASE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

Page 7

Electrical Specifications Refer to the Block Diagram (page 4) and Typical Application Schematics (page 5). Operating conditions unless otherwise noted 12V 4.5V Boldface limits apply over the operating temperature range, -40°C to ...

Page 8

Page 9

Performance Curves 100 24V V 12V 0.0 0.5 1.0 LOAD CURRENT (A) FIGURE 5. EFFICIENCY, SYNCHRONOUS BUCK, FORCED PWM MODE, 500kHz, ...

Page 10

Performance Curves 200 180 160 140 120 100 -50 - AMBIENT TEMPERATURE (°C) FIGURE 11. INPUT QUIESCENT CURRENT UNDER NO LOAD, PFM MODE, AUXVCC CONNECTED ...

Page 11

Performance Curves V OUT PHASE 20V/DIV 2ms/DIV FIGURE 17. V 36V, PREBIASED START- 100mV/DIV (5V OFFSET) OUT I 1A/DIV OUT PHASE 20V/DIV 1ms/DIV FIGURE 19. V 24V STEP LOAD, FORCE PWM MODE IN V 200mV/DIV ...

Page 12

Performance Curves V 10mV/DIV (5V OFFSET) OUT PHASE 10V/DIV 5µs/DIV FIGURE 23. NON-SYNCHRONOUS BUCK, FORCE PWM MODE, V 12V 1V/DIV OUT V _BOOST 5V/DIV IN 20ms/DIV FIGURE 25. BOOST BUCK MODE, BOOST INPUT STEP FROM 3V TO ...

Page 13

Functional Description Initialization Initially, the ISL78200 continually monitors the voltage at EN pin. When the voltage on EN pin exceeds its rising threshold, the internal LDO will start-up to build (POR) circuits detect that V voltage has ...

Page 14

Output Current With the high side MOSFET integrated, the maximum current ISL78200 can support is decided by the package and many operating conditions including input voltage, output voltage, duty cycle, switching frequency and temperature, etc. First: The maximum DC output ...

Page 15

R1 EXT_BOOST R2 R3 AUXVCC R4 Assuming VBAT is the boost input voltage, V output voltage and V is the buck output voltage, the steady OUT state transfer functions are: 1 ⋅ V ------------ - VBAT = OUTBST 1 D ...

Page 16

Oscillator and Synchronization The oscillator has a default frequency of 500kHz with the FS pin connected to VCC, ground, or floating. The frequency can be programmed to any frequency between 200kHz and 2.2MHz with a resistor from the FS pin ...

Page 17

Input Capacitors Depending upon the system input power rail conditions, the aluminum electrolytic type capacitor is normally needed to provide the stable input voltage and restrict the switching frequency pulse current in small areas over the input traces for better ...

Page 18

Revision History The revision history provided is for informational purposes only and is believed to be accurate, but not warranted. Please go to web to make sure you have the latest Rev. DATE REVISION September 22, 2011 FN7641.0 Initial Release ...

Page 19

HTSSOP (Heat-Sink TSSOP) Family 0. (N/2)+ TOP VIEW B D1 EXPOSED THERMAL PAD BOTTOM VIEW e C SEATING PLANE 0. LEADS SIDE VIEW SEE DETAIL “X” END ...

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