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Part: ISL6235CA-T
Category:
Power Management
-> Portable
Description: Advanced Triple PWM Only Mode And Dual Linear Power Controller For Portable Applications
Company: Intersil Corporation
Datasheet: Download ISL6235CA-T datasheet File size : 765 kB
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Datasheet text preview:
ISL6235
TM
D a t a Sheet
J u ne 2001
Fi l e Number
90 29
Advanced Triple PWM Only Mode and Dual Linear Power Controller for Portable Applications
The ISL6235 provides a highly integrated power control and protection solution for five output voltages required in highperform ance notebook PC applications. The IC integrates three fixed frequency pulse-width-modulation (PWM) controllers and two linear regulators along with monitoring and protection circuitry into a single 24 lead SSOP package. The two PWM controllers that regulate the system main 5V and 3.3V voltages are implemented with synchronousrectified buck converters. Synchronous rectification insures high efficiency over a wide range of input voltage and load variation. Efficiency is further enhanced by using the lower MOSFET's rDS(ON) as the current sense element. Input voltage feed-forward ramp modulation, current-mode control, and internal feed-back compensation provide fast and stable handling of input voltage load transients encountered in advanced portable computer chip sets. The third PWM controller is a boost converter that regulates a resistor selectable output voltage of nominally12V. Two internal linear regulators provide +5V ALWAYS and +3.3V ALWAYS low current outputs required by the notebook system controller.
Features
· PWM Only Mode for Reduced Noise at Light Loads · Provides Five Regulated Voltages - +5V ALWAYS - +3.3V ALWAYS - +5V Main - +3.3V Main - +12V · High Efficiency Over Wide Line and Load Range - Synchronous Buck Converters on Main Outputs · No Current-Sense Resistor Required - Uses MOSFET's rD S( O N) - Optional Current-Sense Resistor for More Precision · Operates Directly From Battery 5.6 to 24V Input · Input Undervoltage Lock-Out (UVLO) · Excellent Dynamic Response - Voltage Feed-Forward and Current-Mode Control · M onitors Output Voltages · Synchronous Converters Operate Out of Phase · Separate Shut-Down Pins for Advanced Configuration and Power Interface (ACPI) Compatibility · 300kH z Fixed Switching Frequency on Main Outputs
Ordering Information
PART NUMBER IS L6235CA IP M6220E VAL1 TEMP. RANGE (oC) -10 to 85 PACKAGE 24 Ld SSOP PKG. NO. M24.15
· Thermal Shut-Down Protection
Applications
· M obile PCs · Hand-Held Portable Instruments
Evaluation Board
Pinout
ISL6235 (SSOP) TOP VIEW
VBATT 1 3.3V ALWAYS 2 BOOT2 3 UGATE2 4 PHASE2 5 5V ALWAYS 6 LGATE2 7 PGND2 8 ISEN2 9 VSEN2 10 SDWN2 11 PGOOD 12 24 BOOT1 23 UGATE1 22 PHASE1 21 ISEN1 20 LGATE1 19 PGND1 18 VSEN1 17 SDWN1 16 GATE3 15 VSEN3 14 GND 13 SDWNALL
· LCD PCs · Cable Modems · DSL Modems · Set Top Box
Related Literature
· Application Note AN9915 (IPM6220)
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 trademark of Intersil Americas Inc. Copyright © Intersil Americas Inc. 2001, All Rights Reserved
Block Diagram
VSEN3
GATE3
VBATT U VFLT
G ND GATE LOGIC 1 HI HG DR1
BOOT1 UGATE1 PHASE1
CL K1
BOOST CONTROLLER
RAM P 2
CL K 200ns CL K1
RAMP 1
POWER-ON RESET (POR) POR
SHUTOFF
CL K2 REF
LGATE2 PGND2 VSEN2
LO OVP2
PWM ON
QD R Q< +
VOLTSECOND CLAMP R1 = 20K
OC COMP2 2 .8V EA 2 RE F VOLTSECOND CLAMP I SEN2 R1 = 20K + UVFLT LGATE2 OVP1 OVP2 LGATE2 OUTPUT VOLTAGE MONITOR PGOOD L DO 2 RE F 3.3V-ALWAYS 5 V-A LWAYS 2 .5V + + + + OC LOGIC2 VCC PWM LATCH 2 DQ R >Q SDWN LD O1 V CC SDWN VBATT VSEN1 LGATE1
-
2
BOOT2 U GATE2 PHASE2 HGDR2 HI VCC LGDR2
DEADTIME LGDR1 PWM ON GATE LOGIC 2 LO OVP1
VCC LGATE1 PGND1 VSEN1
SHUTOFF OC COMP1 DEADTIME PWM VCC LATCH 1 OC LOGIC1 -
ISL6235
+ + EA1 + REF ISEN1 + LGATE1 P OR SDWN1 REFERENCE AND SOFT START SDWN2 SDWNALL
ISL6235 Simplified Power System Diagram
VBATT VBATT Q1 3.3V ALWAYS LINEAR CONTR OLLER LINEAR CONTROLLER 5V MAIN PWM1 CONTROLLER Q2
5V ALWAYS
ISL6235
VBATT Q1 3.3 V MAIN PWM2 CONTROLLER Q2
VOLTAGE, CURRE NT MONITORS
PGOOD
12V BOOST
PWM3 CONTROLLER
Typical Application
+VBATT
PROCESSOR 5V MAIN 3.3V MAIN 5V ALWAYS 3.3V ALWAYS 12V PC M CIA E NABL E C8051 VID CODE SDWN VI/O I /O CL O CK
SDWN1 SDWN 2
VCORE
µ P CORE
ISL6235
IPM6210
VCLOCK PGOOD PGOOD
RESET
SDWNALL ON/OFF
3
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