ISL8112IRZ Intersil, ISL8112IRZ Datasheet

ISL8112IRZ

Manufacturer Part Number

ISL8112IRZ

Description

IC MAIN POWER SUPP CTRLR 32-QFN

Manufacturer

Intersil

Type

Step-Down (Buck)r

Datasheet

1.ISL8112IRZ.pdf (27 pages)

Specifications of ISL8112IRZ

Internal Switch(s)

Synchronous Rectifier

Yes

Number Of Outputs

Voltage - Output

0.7 ~ 5.5 V

Current - Output

200mA

Voltage - Input

5.5 ~ 25 V

Operating Temperature

-40°C ~ 100°C

Mounting Type

Surface Mount

Package / Case

32-VQFN Exposed Pad, 32-HVQFN, 32-SQFN, 32-DHVQFN

Power - Output

5mW

Rohs Compliant

YES

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Frequency - Switching

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

ISL8112IRZ

Manufacturer:

Intersil

Quantity:

315

Current page: 1 of 27
Download datasheet (888Kb)

High Light-Load Efficiency, Dual-Output,

Main Power Supply Controllers

ISL8112 is a dual-output Synchronous Buck controller with 2A

integrated driver. It features high light load efficiency which is

especially preferred in systems concerned with high efficiency

in wide load range, like the battery powered system. ISL8112

includes two constant on-time PWM controllers. Either of the

two outputs can operate in output fixed mode or adjustable

mode. In fixed mode, one output can be 5V or 3.3V and the

other can output 1.5V or 1.05V. In output adjustable mode,

one output can be 0.7V to 5.5V, and the other output can

range from 0V to 2.5V (sensing output voltage directly) or up

to 5V (using resistor divider voltage for voltage sensing). This

device also features a linear regulator providing 3.3V/5V, or

adjustable from 0.7V to 4.5V via LDOREF. The linear

regulator provides up to 100mA output current with automatic

linear-regulator bootstrapping to the BYP input. When in

switch over, the LDO output can source up to 200mA.

ISL8112 includes on-board power-up sequencing, the power-

good (PGOOD_) outputs, digital soft-start, and internal soft-

stop output discharge that prevents negative voltages on

shutdown.

ISL8112 is implemented with constant on-time PWM control

scheme which need no sense resistors and provides 100ns

response to load transients while maintaining a relatively

constant switching frequency. The unique ultrasonic pulse-

skipping mode maintains the switching frequency above

25kHz, eliminating undesired audible noises in low frequency

operation at light load. Other features include pulse skipping

which maximizes efficiency in light-load applications, and

fixed-frequency PWM mode which reduces RF interference in

sensitive applications.

Ordering Information

ISL8112IRZ*

*Add “-T” suffix for tape and reel. Please refer to TB347 for details on

reel specifications.

NOTE: 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). Intersil Pb-free products are MSL classified at Pb-free

peak reflow temperatures that meet or exceed the Pb-free

requirements of IPC/JEDEC J STD-020.

NUMBER

(Note)

PART

ISL8112 IRZ -40 to +100 32 Ld QFN

MARKING

PART

RANGE

TEMP.

(°C)

Data Sheet

(Pb-free)

PACKAGE

L32.5x5B

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

DWG. #

PKG.

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

Features

• Wide Input Voltage Range 5.5V to 25V

• Constant ON-TIME Control with 100ns Load-Step

• Dual Fixed Outputs of 1.05V (3.3V) and 1.5V (5.0V), or

• Adjustable Switching Frequency: 400/500kHz,

• Very High Light Load Efficiency (Skip Mode)

• 5mW Quiescent Power Dissipation

• ±1.5% (LDO): 100mA, 200mA (Switch Over)

• 3.3V Reference Voltage ±2.0%: 5mA

• 2.0V Reference Voltage ±1.0%: 50µA

• Temperature Compensated r

• Programmable Current Limit with Foldback Capability

• Selectable PWM, Skip or Ultrasonic Mode

• Independent PGOOD1 and PGOOD2 Comparators

• Soft-Start with Pre-Biased Output and Soft-Stop

• 1.7ms Digital Soft-Start and Independent Shutdown

• Independent ENABLE

• Thermal Shutdown

• Extremely Low Components Count

• Pb-Free Available (RoHS Compliant)

Applications

• Power Supply for Telecom/Datacom and POL

• System Requiring High Efficiency in Wide Load Range

• Compact Design with Minimum Components Count

• PDAs and Mobile Communication Devices

• 3- and 4-Cell Li+ Battery-Powered Devices

• DDR1, DDR2, and DDR3 Applications

Response

Adjustable Outputs of 0.7V to 5.5V (SMPS1) and 0V to

2.5V/5V (SMPS2), ±1.5% Accuracy

300/400kHz, 200/300kHz

August 10, 2010

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

Intersil (and design) is a registered trademark of Intersil Americas Inc.

DS(ON)

Current Sensing

ISL8112

FN6396.1

Related parts for ISL8112IRZ

ISL8112IRZ Summary of contents

Page 1

... PART RANGE (Note) MARKING (°C) ISL8112IRZ* ISL8112 IRZ -40 to +100 32 Ld QFN *Add “-T” suffix for tape and reel. Please refer to TB347 for details on reel specifications. NOTE: These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, ...

Page 2

Pinout VREF1 EN_LDO VREF2 LDOREF 2 ISL8112 ISL8112 (32 LD 5X5 QFN) TOP VIEW VCC VIN 6 LDO ...

Page 3

... ISL8112 Thermal Information Thermal Resistance (Typical, Note QFN (Notes Operating Temperature Range . . . . . . . . . . . . . . . .-40°C to +100°C Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +150°C Storage Temperature Range . . . . . . . . . . . . . . . . . .-65°C to +150°C Pb-Free Reflow Profile .see link below http://www.intersil.com/pbfree/Pb-FreeReflow.asp = +25°C. A CONDITIONS LDO in regulation V = LDO, VSEN1 < 4.43V 5.5V to 25V, OUT2REF > (VCC - 1V), MODE = 5V ...

Page 4

Electrical Specifications Circuit of Figure 17, and Figure 18, no load on LDO, VSEN1, VSEN2, VREF2, and VREF1, VIN = 12V, EN2 = EN1 = VCC, VBYP = 5V, PVCC = 5V, VEN_LDO = 5V, T Typical values are at ...

Page 5

Page 6

Page 7

Pin Descriptions PIN NAME VREF1 2V Reference Output. Bypass to GND with a 0.1µF (min) capacitor. VREF1 can source up to 50μA for external loads. 1 Loading VREF1 degrades FB and output accuracy according to the VREF1 load-regulation error. FS ...

Page 8

Pin Descriptions (Continued) PIN NAME LG2 SMPS2 Synchronous-Rectifier Gate-Drive Output. LG2 swings between GND and PVCC. 23 BOOT2 Boost Flying Capacitor Connection for SMPS2. Connect to an external capacitor according to the typical application 24 circuits (Figure 17 and Figure ...

Page 9

Typical Performance Curves 7 V SKIP MODE PWM MODE ULTRA SKIP MODE SKIP MODE PWM MODE IN 1.0 0.9 0.8 ...

Page 10

Typical Performance Curves 600 PWM 500 400 300 200 ULTRA-SKIP 100 SKIP 0 0.001 0.010 0.100 OUTPUT LOAD (A) FIGURE 3.3V FREQUENCY vs LOAD OUT2 450 400 350 PWM 300 250 200 150 ULTRA-SKIP 100 50 0 ...

Page 11

Typical Performance Curves 177.5 177.0 176.5 176.0 175.5 175.0 174.5 174.0 173.5 173 INPUT VOLTAGE (V) FIGURE 15. STANDBY INPUT CURRENT vs V (EN = EN2 = 0, EN_LDO = VCC) Typical Application Circuits ...

Page 12

PWM ramp signal; thus the output filter capacitor's ESR acts as a current-feedback resistor. The high-side switch on-time is determined by a one-shot whose period is inversely proportional to input voltage and directly proportional to output voltage. Another ...

Page 13

VIN: 5.5V to 25V C8 1µF C10 10µF Q3a SI4816BDY OUT1 – PCI-e C9 L1: 3.3µH 1.25V/5A 0.1µF Q3b C11 C11 330µF 9mΩ 6.3V VCC R1 7.87kΩ 5V FB1 TIED TO GND = 5V FB1 TIED TO VCC = 1.5V ...

Page 14

VIN: 5.5V to 25V C8 1µF C10 SI4816BDY 10µF Q3a OUT1 C9 L1: 3.3µH 1.5V/5A 0.1µF Q3b C11 C11 33µF 9mΩ 6.3V VCC 3.3V VCC FB1 TIED TO GND = 5V FB1 TIED TO VCC = 1.5V R3 200kΩ ON ...

Page 15

VIN: 4.5V to 5.5V VIN: 4. 1µF 1µF C10 C10 10 µ µ Q3a Q3a SI4816BDY SI4816BDY C9 C9 L2: 1.5µH L2: 1.5µH 2.5V/5A 2.5V/5A 0.1µF 0.1µF Q3b Q3b C11 C11 ...

Page 16

BOOT1 UG1 PH1 PVCC SMPS1 LG1 SYNCH. GND PWM BUCK CONTROLLER ILIM1 EN1 FB1 PGOOD1 VSEN1 VSEN1 BYP SW THRES. LDO LDO LDOREF VIN EN_LDO POWER-ON POWER-ON SEQUENCE SQUENCE EN1 CLEAR FAULT CLEAR FAULT LATCH LATCH EN2 FIGURE 20. DETAIL ...

Page 17

FS VIN VIN ILIM_ 5µA VCC PH_ VSEN_ FB DECODER FB_ Automatic Pulse-Skipping Switch Over (Idle Mode) In Idle Mode (MODE = GND), an inherent automatic switch over to PFM takes place at light loads. This switch over is affected ...

Page 18

DC output accuracy specifications refer to the trip level of the error comparator. When the inductor is in continuous conduction, the output voltage has ...

Page 19

Therefore, the exact current-limit characteristic and maximum load capability are a function of the current-limit threshold, inductor value and input and output voltage. I LOAD(MAX) I LOAD(MAX) I LOAD(MAX) ...

Page 20

Adaptive dead-time circuits monitor the LG_ and UG_ drivers and prevent either FET from turning on until the other is fully off. This algorithm allows operation without shoot- through with a wide range of MOSFETs, minimizing delays and maintaining efficiency. ...

Page 21

Discharge Mode (Soft-Stop) When a transition to standby or shutdown mode occurs, or the output is discharged to GND through an internal 25Ω switch, the reference remains active to provide an accurate threshold and to provide overvoltage protection. When the ...

Page 22

Adjustable-Output Feedback (Dual-Mode FB) Connect FB1 to GND to enable the fixed 5V or tie FB1 to VCC to set the fixed 1.5V output. Connect a resistive voltage-divider at FB1 between output and GND to adjust the respective output voltage ...

Page 23

Example 5A 12V, V LOAD(MAX 200kHz, 35% ripple current or LIR = 0.35 12V 5V – L 8.3μH ----------------------------------------------------------------- = = ⋅ ⋅ ⋅ 12V 200kHz 0.35 5A Find a ...

Page 24

⎛ ⎞ – OUT IN OUT_ ≈ ⎜ ⎟ ------------------------------------------------------------ RMS LOAD V ⎝ ⎠ IN When ⋅ IRMS has maximum 50 OUT_ ...

Page 25

For example, use an MBR0530 (500mA-rated) type for loads up to 1.5A, a 1N5817 type for loads 1N5821 type for loads up to 10A. The rectifier's rated reverse breakdown voltage must be at least ...

Page 26

... Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use ...

Page 27

Package Outline Drawing L32.5x5B 32 LEAD QUAD FLAT NO-LEAD PLASTIC PACKAGE Rev 3, 5/10 5.00 6 PIN 1 INDEX AREA (4X) 0.15 TOP VIEW ( 4. 80 TYP ) ( TYPICAL RECOMMENDED LAND PATTERN 27 ISL8112 A ...

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