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Part: ISL6522A
Category:
Power Management
-> Desktop
Description: Buck And Synchronous Rectifier Pulse-width Modulator (PWM) Controller
Company: Intersil Corporation
Datasheet: Download ISL6522A datasheet File size : 402 kB
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Datasheet text preview:
®
ISL6522A
D a ta Sheet Ju ly 2003 FN9122.1
Buck and Synchronous Rectifier Pulse-Width Modulator (PWM) Controller
The ISL6522A provides complete control and protection for a DC-DC converter optimized for high-performance microprocessor applications. It is designed to drive two N-Channel MOSFETs in a synchronous rectified buck topology. The ISL6522A integrates all of the control, output adjustment, monitoring and protection functions into a single package. The output voltage of the converter can be precisely regulated to as low as 0.8V, with a maximum tolerance of ±0.5% over temperature and line voltage variations. The ISL6522A provides simple, single feedback loop, voltage-mode control with fast transient response. It includes a 200kHz free-running triangle-wave oscillator that is adjustable from below 50kHz to over 1MHz. The error amplifier features a 15MHz gain-bandwidth product and 6V/µs slew rate which enables high converter bandwidth for fast transient performance. The resulting PWM duty ratio ranges from 0100%. The ISL6522A protects against overcurrent conditions by inhibiting PWM operation. The ISL6522A monitors the current by using the rDS(ON) of the upper MOSFET which eliminates the need for a current sensing resistor.
Features
· Drives two N-Channel MOSFETs · Operates from +5V or +12V input · Simple single-loop control design - Voltage-mode PWM control · Fast transient response - High-bandwidth error amplifier - Full 0100% duty ratio · Excellent output voltage regulation - 0.8V internal reference - ±0.5% over line voltage and temperature · Overcurrent fault monitor - Does not require extra current sensing element - Uses MOSFETs rDS(ON) · Conver ter can source and sink current · Small converter size - Constant frequency operation - 200kHz free-running oscillator programmable from 50kHz to over 1MHz · 16 Lead 5x5mm QFN Package · QFN Package - Compliant to JEDEC PUB95 MO-220 QFN-Quad Flat No Leads-Product Outline. - Near Chip-Scale Package Footprint; Improves PCB Efficiency and Thinner in Profile
Pinout
ISL6522ACR (16 LEAD QFN) TOP VIEW
OCSET VCC NC RT
Applications
12 PVCC 11 LGATE 10 PGND 9 BOOT
16 SS COMP FB EN 1 2 3 4 5 NC
15
14
13
· Power supply for Pentium®, Pentium Pro, PowerPC® and AlphaPCTM microprocessors · High-power 5V to 3.xV DC-DC regulators · Low-voltage distributed power supplies
Ordering Information
PART NUMBER ISL65 22ACR TEMP. RANGE (oC) 25 to 70 PACKAGE 16 Ld 5x5 QFN PKG. DWG. # L 16.5x5B
6 GND
7 PHASE
8 UGATE
1
CCAUTION: 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. Copyright © Intersil Americas Inc. 2003. All Rights Reserved. All other trademarks mentioned are the property of their respective owners.
ISL6522A Typical Application
12V VCC SS OCSET MONITOR AND PROTECTION EN BOOT RT +5V OR +12V
OSC ISL6522A REF +
UGATE PHASE +VO PVCC LGATE PGND GND +12V
FB
+ COMP
Block Diagram
VCC
POWER-ON RESET (POR) 1 0 µA OCSET + OVER CURRENT 4V SOFTSTART
EN
SS BOOT UGATE PHASE
2 0 0 µA
REFERENCE
0.8VREF + ERROR AMP
PWM COMPARATOR + INHIBIT PWM
GATE CONTROL LOGIC
PVCC LGATE PGND
FB COMP
GND RT OSCILLATOR
2
ISL6522A
Absolute Maximum Ratings
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +15.0V Boot Voltage, VBOOT - VPHASE . . . . . . . . . . . . . . . . . . . . . . . +15.0V Input, Output or I/O Voltage . . . . . . . . . . . . GND -0.3V to VCC +0.3V ESD Classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Class 2
Thermal Information
Thermal Resistance JA(oC/W) JC(oC/W) QFN Package (Notes 1, 2) . . . . . . . . . . 36 5 Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . 150oC Maximum Storage Temperature Range . . . . . . . . . . -65oC to 150oC Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300oC (SOIC - Lead Tips Only)
Recommended Operating Conditions
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . +12V ±10% Ambient Temperature Range, ISL6522AC. . . . . . . . . . 25oC to 70oC Junction Temperature Range, ISL6522AC. . . . . . . . . . 0oC to 125oC
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.
NOTE: 1. JA is measured in free air with the component mounted on a high effective thermal conductivity test board with "direct attach" features. SeeTech Brief TB379. 2. For JC, the "case temp" location is the center of the exposed metal pad on the package underside.
Electrical Specifications
PARAMET ER VCC SUPPLY CURRENT Nominal Supply Shutdown Supply POWER-ON RESET Rising VCC Threshold Falling VCC Threshold Enable-Input Threshold Voltage Rising VOCSET Threshold OSCILLATOR Free Running Frequency Total Variation Ramp Amplitude REFERENCE Reference Voltage Tolerance Reference Voltage ERROR AMPLIFIER DC Gain Gain-Bandwidth Product Slew Rate GATE DRIVERS Upper Gate Source Upper Gate Sink Lower Gate Source Lower Gate Sink PROTECTION OCSET Current Source Soft-Start Current
Recommended Operating Conditions, Unless Otherwise Noted SYMBOL TEST CONDITIONS M IN T YP M AX UN ITS
ICC
EN = VCC; UGATE and LGATE Open EN = 0V
-
5 50
100
mA µA
VOCSET = 4.5VDC VOCSET = 4.5VDC VOCSET = 4.5VDC
8.8 0.8 -
1 .2 7
10.4 2.0 -
V V V V
RT = OPEN, VCC = 12 6k < RT to GND < 200k VOSC RT = OPEN
175 -20 -
200 1. 9
230 +20 -
kHz % VP-P
VREF
-0.5 -
0 .8 0 0
0.5 -
% V
G BW SR COMP = 10pF -
88 15 6
-
dB MHz V /µ s
IUGATE RUGATE ILGATE RLGATE
VBOOT - VPHASE = 12V, VUGATE = 6V ILGATE = 0.3A VCC = 12V, VLGATE = 6V ILGATE = 0.3A
350 300 -
500 5. 5 450 3. 5
10 6.5
mA mA
IOCSET ISS
VOCSET = 4.5VDC
170 -
200 10
230 -
µA µA
3
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