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Details, datasheet, quote on part number:ISL6411EVAL1
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Datasheet text preview:
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ISL6411
D a ta Sheet Ja n u ar y 2003 FN9081.1
Triple Output, Low-Noise LDO Regulator with Integrated Reset Circuit
The ISL6411 is an ultra low noise triple output LDO regulator with microprocessor reset circuit and is optimized for powering wireless chip sets. The IC accepts an input voltage range of 3.0V to 3.6V and provides three regulated output voltages: 1.8V (LDO1), 2.84V (LDO2), and another ultra clean 2.84V (LDO3). On chip logic provides sequencing between LDO1 and LDO2 for BBP/MAC and I/O supply voltage outputs. LDO3 features ultra low noise that does not typically exceed 30µV RMS to aid VCO stability. High integration and the thin Quad Flat No-lead (QFN) package makes ISL6411 an ideal choice to power many of today's small form factor industry standard wireless cards, such as PCMCIA, mini-PCI and Cardbus-32. The ISL6411 uses an internal PMOS transistor as the pass device. The SHDN pin controls LDO1 and LDO2 outputs whereas SHDN3 controls LDO3 output. Internal voltage sequencing insures that LDO1 output (1.8V supply) is always stabilized before LDO2 is turned on. When powering down, power to the LDO2 is removed before the LDO1 output goes off. The ISL6411 also integrates RESET function, which eliminates the need for additional RESET IC required in WLAN applications. The IC asserts a RESET signal whenever the VIN supply voltage drops below a preset threshold, keeping it asserted for at least 25msec after Vin has risen above the reset threshold. An output fault detection circuit indicates loss of regulation on any of the three outputs. Other features include an over current protection, thermal shutdown and reverse battery protection.
Features
· Small DC-DC Converter Size - Three LDOs and RESET Circuitry in a Low-Profile 4x4mm QFN Package · High Output Current - LDO1, 1.8V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500mA - LDO2, 2.84V. . . . . . . . . . . . . . . . . . . . . . . . . . . . 300mA - LDO3, 2.84V. . . . . . . . . . . . . . . . . . . . . . . . . . . . 200mA · Ultra-Low Dropout Voltage - LDO2, 2.84V. . . . . . . . . . . . . . . 125mV (typ.) at 300mA - LDO3, 2.84V. . . . . . . . . . . . . . . 100mV (typ.) at 200mA · Ultra-Low Output Voltage Noise - <30µVRMS (typ.) for LDO3 (VCO Supply) · Stable with Smaller Ceramic Output Capacitors · Voltage Sequencing for BBP/MAC and Analog Supplies · Extensive Protection and Monitoring Features - Over current protection - Short circuit protection - Thermal shutdown - Reverse battery protection - FAULT indicator · Logic-Controlled Dual Shutdown Pins · Integrated Microprocessor Reset Circuit - Programmable Reset Delay - Complimentary Reset Outputs · Proven Reference Design for Total WLAN System Solution · QFN Package - Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat No Leads - Product Outline - Near Chip-Scale Package Footprint Improves PCB Efficiency and Is Thinner in Profile
Pinout
ISL6411 (QFN) TOP VIEW
RESET FAULT
VIN
VIN
16 RESET CT SHDN SHDN3 1 2 3 4 5 O U T3
15
14
13 1 2 OUT1 1 1 CC1 1 0 OUT2 9 CC2
Applications
· PRISM® 3 Chipsets ISL37106P · WLAN Cards - PCMCIA, Cardbus32, MiniPCI Cards - Compact Flash Cards · Liberty Chipset · Hand-Held Instruments
6 CC3
7 GND3
8 GND
Ordering Information
PART NUMBER ISL64 11IR TEMP. RANGE (oC) -40 to +85 PACKAGE 16 Ld QFN PKG. NO. L16.4x4
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc. PRISM® is a registered trademark of Intersil Americas Inc. Copyright © Intersil Americas Inc. 2003. All Rights Reserved All other trademarks mentioned are the property of their respective owners.
ISL6411 Typical Application Schematic
+3.3V VIN
+
C8
3.3µF 14 VIN 13 VIN 16 15
RESET
F AULT
+1.8V VOUT1
12 11 10 9 C4 0.033µF C3 0.033µF C2 3.3µF C1 3.3µF
C7 0.01µF
1 2 3 4
RESET CT SHDN SHDN3
ISL6411
O U T1 CC1 O U T2 CC2
+2.84V VOUT2
+2.84V VOUT3
C5 3.3µF
5 6 7 8 E E C6 0.033µF
2
O U T3 CC 3 GND3 GND
ISL6411 Functional Block Diagram
Gm VIN 13
VIN + LDO1 BAND GAP REF. 1.2V WINDOW COMP O U T1
14
12
CC1 Gm THERMAL SHUT DOWN 150o C + LDO 2 15 FAULT WINDOW COMP OUT2
11
VIN
10
VIN CONTROL LOGIC Gm
CC2
9
3
SHDN + OUT3 5
4
SHDN3
LDO 3
ENABLES 2 CT
WINDOW COMP
16
RESET
RESET BIAS CC3 6
1
RESET
8
GND
GND3
7
3
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