MIC2546/2547 Dual Programmable Current Limit Switch Final Informa

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MIC2546/2547 Dual Programmable Current Limit Switch Final Informa

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MIC2546/2547
MIC2546/2547
Dual Programmable Current Limit Switch Final Information
General Description
MIC2546 MIC2547 integrated high-side dual power switches optimized loss power switching other power management applications, including Advanced Configuration Power Interface (ACPI). MIC2546/47 cost-effective, highly integrated solution that requires external components satisfy ACPI requirements. Load current management features include precision resistor-programmable output current-limit soft-start circuit which minimizes inrush current when switch enabled. Thermal shutdown, along with current-limit, protects switch attached device. MIC2546/47's open-drain flag outputs used indicate current-limiting thermal shutdown local controller. MIC2547 additional internal latch which turns output upon thermal shutdown providing robust fault control. enable signal compatible with both logic, also used thermal shutdown latch reset MIC2547. MIC2546 MIC2547 available active-high active-low enable versions 16-pin TSSOP packages.
Features
2.7V 5.5V input Adjustable current-limit 1.5A Reverse current flow blocking "body diode") 100µA typical on-state supply current channel typical off-state supply current 120m maximum on-resistance Open-drain fault flag Thermal shutdown Thermal shutdown output latch (MIC2547) (slow) turn-on fast turnoff Available with active-high active-low enable power distribution Power Switching Notebook ACPI power distribution card swap applications Inrush current-limiting Ideal dual supply applications
Applications
Typical Application
0.1µF
RFLGA
MIC2546-xBM On/Off FLGA GNDA OUTA OUTA OUTB OUTB 33µF Peripheral 33µF Peripheral
RSETA
ILIMA On/Off FLGB
RFLGB
GNDB ILIMB
RSETB
+3.3V 0.1µF
Typical Advanced Configuration Power Interface (ACPI) Application
Micrel, Inc. 1849 Fortune Drive Jose, 95131 (408) 944-0800 (408) 944-0970 http://www.micrel.com
March 2001
MIC2546/2547
MIC2546/2547
Ordering Information
Part Number MIC2546-1BM MIC2546-1BTS MIC2546-2BM MIC2546-2BTS MIC2547-1BM MIC2547-1BTS MIC2547-2BM MIC2547-2BTS Enable Active High Active High Active Active Active High Active High Active Active Latch* Temperature Range -40°C +85°C -40°C +85°C -40°C +85°C -40°C +85°C -40°C +85°C -40°C +85°C -40°C +85°C -40°C +85°C Package 16-pin 16-pin TSSOP 16-pin 16-pin TSSOP 16-pin 16-pin TSSOP 16-pin 16-pin TSSOP
Thermal Shutdown Latch
Configuration
MIC2546/2547 OUTA FLGA GNDB ILIMB OUTB OUTA ILIMA GNDA FLGB OUTB
(ILIMB) (GND) (ENA) (FLGA) (ILIMA) (ENB) (FLGB)
LOGIC, CHARGE PUMP
MIC2546/2547
LOGIC, CHARGE PUMP
(OUTA) (INA) (OUTB) (INB)
Functional Pinout
16-Pin 16-Pin TSSOP (TS)
Description
Number Name OUTA Function Input Output MOSFET drain. Also supplies internal circuitry. Switch (Output): Output MOSFET source. Pins must externally connected. Enable (Input): Logic-compatible enable input. Active-high (-1) activelow (-2). High input >1.7V typical; input <1.5V typical. float. MIC2547 only: Also resets thermal shutdown latch. internally connected. Fault Flag (Output): Active-low, open-drain output. Indicates overcurrent thermal shutdown conditions. MIC2547 only: latched thermal shutdown. Ground. Both pins must connected GND. Current Limit Channel Sets current-limit threshold using external resistor, RSET, connected ground. RSET 2.29k. Switch (Output): Pins must externally connected. Input Enable (Input) Fault Flag (Output) Current Limit Channel
FLGA
GNDB, GNDA ILIMB OUTB FLGB ILIMA
MIC2546/2547
March 2001
MIC2546/2547
Absolute Maximum Ratings (Note
Supply Voltage (VIN) +6.0V Output Voltage (VOUT) +6.0V Output Current (IOUT) Internally Limited Enable Input (VEN) -0.3V +0.3V Fault Flag Voltage (VFLG) +6.0V Fault Flag Current (IFLG) 50mA Storage Temperature (TS) -65°C +150°C Junction Temperature (TJ) Internally Limited Lead Temperature (soldering sec.) 260°C Rating, Note
Operating Ratings (Note
Supply Voltage (VIN) +2.7V +5.5V Current Limit Range 1.5A Ambient Temperature Range (TA) -40°C +85°C Package Thermal Resistance (JA) 120°C/W TSSOP (JA) 100°C/W
Electrical Characteristics
+5V; 25°C, bold indicates -40°C +85°C; unless noted Symbol Parameter Supply Current Condition Switch off, open, Note Switch open, Note Enable Input Voltage Enable High, Note Enable Low, Note Enable Input Current VOH(min) 2.4V VOL(max) 0.8V Enable Input Capacitance RDS(on) Switch Resistance Current Limit Factor, Note Output Leakage Current tOFF Output Turn-On Delay Output Turn-On Rise Time Output Turnoff Delay Output Turnoff Fall Time Overtemperature Threshold Shutdown Error Flag Output Resistance Note IOUT 500mA IOUT 100mA 1.5A, VOUT 1.0V 4.0V, Note Switch 1µF, Figure 1µF, Figure 1µF, Figure 1µF, Figure increasing decreasing 10µA 3.3V, 10µA Error Flag Current Pulse Reset Width Set-Up Current-Limit Response Time Overcurrent Response Time
Note Note Note Note Note Note
Units
0.01
VFLG MIC2547 Thermal Shutdown Latch MIC2547, Note VOUT VOUT VIN/2
Exceeding absolute maximum rating damage device. device guaranteed function outside operating rating. Devices sensitive. Handling precautions recommended. Human body model, 1.5k series with 100pF. 0.8V 2.4V MIC2546-1 MIC2547-1. 2.4V 0.8V MIC2546-2 MIC2547-2. enable input about 200mV hysteresis. Guaranteed design, production tested.
230V Current limit threshold determined ILIMIT where RSET ohms.
March 2001
MIC2546/2547
MIC2546/2547
Typical Characteristics
Output On-Resistance Supply Voltage
ON-RESISTANCE 27°C
ON-RESISTANCE
Output On-Resistance Temperature
SUPPLY CURRENT (mA)
On-State Supply Current Supply Voltage
SUPPLY VOLTAGE 27°C
3.3V
2.7V
5.0V
SUPPLY VOLTAGE
TEMPERATURE (°C)
On-State Supply Current Temperature
SUPPLY CURRENT (µA)
SUPPLY CURRENT (µA)
Off-State Supply Current Temperature
SUPPLY CURRENT (µA)
Off-State Supply Current Supply Voltage
0.20 0.18 0.16 0.14 0.12 0.08 0.06 0.04 0.02
5.0V 2.7V 3.3V
27°C
5.0V 3.3V
2.7V
TEMPERATURE (°C)
TEMPERATURE (°C)
SUPPLY VOLTAGE
Enable Threshold Voltage Supply Voltage
ENABLE THRESHOLD 27°C RISING
Enable Threshold Voltage Temperature
OUTPUT RISE TIME (ms)
Rise Time Temperature
ENABLE THRESHOLD
RISING TEMPERATURE (°C) FALLING
2.7V 3.3V
FALLING
5.0V
SUPPLY VOLTAGE
TEMPERATURE (°C)
Output Fall Time Temperature
2000
2.7V 3.3V 5.0V CURRENT LIMIT (mA)
Current Limit RSET
OUTPUT CURRENT (mA)
2000
Output Current Output Voltage
RSET
OUTPUT FALL TIME (µs)
1500
1500 1000 RSET RSET 2.3k OUTPUT VOLTAGE
1000
ISHORT
ISET
TEMPERATURE (°C)
1000 RSET
5000
MIC2546/2547
March 2001
MIC2546/2547
Current Limit Temperature
1100 OUTPUT CURRENT (mA) 1000 ISHORT RSET ISET
CURRENT LIMIT (mA)
Current Limit Supply Voltage
1100 1000 ISHORT 27°C ISET
TEMPERATURE (°C)
SUPPLY VOLTAGE
March 2001
MIC2546/2547
MIC2546/2547
Functional Characteristics
VOUT VFLG (2V/div.) (5V/div.) (10V/div.)
VFLG (10V/div.) (5V/div.)
Turn-On Response
Turnoff Response
VOUT (2V/div.)
4.7µF
IOUT (200mA/div.)
4.7µF MIC2546-1 TIME (500µs/div.)
IOUT (200mA/div.)
MIC2546-1 TIME (1ms/div.)
Current-Limit Response
VOUT VFLG (5V/div.) (10V/div.) (10V/div.) VOUT VFLG (5V/div.) (10V/div.) (10V/div.)
Enable Into Heavy Load
Thermal Shutdown
4.7µF
ISET
IOUT (500mA/div.)
IOUT (500mA/div.)
MIC2546-1 TIME (100ms/div.) TIME (100ms/div.)
4.7µF
ISET
MIC2546-1
Enable Into Heavy Load
VFLG (5V/div.) (10V/div.)
4.7µF ISET
Inrush Current Response
VFLG (5V/div.) (10V/div.)
Reset
VOUT (5V/div.)
4.7µF 110µF
Output Latched
IOUT (500mA/div.)
Thermal Shutdown
60µF
IOUT (1A/div.)
10µF MIC2546-1
MIC2547-1 TIME (500µs/div.)
TIME (500µs/div.)
MIC2546/2547
March 2001
MIC2546/2547
Test Circuit
VOUT Device Under Test IOUT
VOUT
Functional Characteristics Test Circuit
Timing Diagrams
tOFF VOUT
Figure MIC2546/47-1
tOFF
VOUT
Figure MIC2546/47-2
March 2001
MIC2546/2547
MIC2546/2547
Output Reset
VOUT ILIMIT IOUT
Short-Circuit Fault
Fault Removed Thermal Shutdown Reached
Figure MIC2547-2 Timing: Output reset toggling
VOUT ILIMIT IOUT
Short-Circuit Fault Fault Removed
Thermal Shutdown Reached
Figure MIC2546-2 Timing
MIC2546/2547
March 2001
MIC2546/2547
Block Diagram
THERMAL SHUTDOWN 1.2V REFERENCE
OSC.
CHARGE PUMP GATE CONTROL
CURRENT LIMIT
ILIMA RSETA
RESET
THERMAL SHUTDOWN LATCH (MIC2547)
OUTA FLGA
THERMAL SHUTDOWN 1.2V REFERENCE
OSC.
CHARGE PUMP GATE CONTROL
CURRENT LIMIT
ILIMB RSETB
RESET
THERMAL SHUTDOWN LATCH (MIC2547)
OUTB FLGB
GNDB
GNDA
March 2001
MIC2546/2547
MIC2546/2547
Adjustable Current-Limit short-circuit current-limit user-adjustable with external resistor. Current-limit range 100mA 1.5A available with point accuracy better than ±20%. current-limit circuit prevents damage output MOSFET external load. nominal current-limit value with external resistor between ILIMX GND. desired current-limit, value external resistor given
Functional Description
MIC2546 MIC2547 dual high-side N-channel switches available with active-high active-low enable inputs. Fault conditions turn inhibit turn-on output transistor activate open-drain error flag transistor making sink current ground. Input Output power supply connection logic circuitry drain output MOSFET. OUTX source output MOSFET. typical circuit, current flows from OUTX toward load. VOUT greater than VIN, current will flow from OUTX since switch bidirectional when enabled. output MOSFET driver circuitry also designed allow MOSFET source externally forced higher voltage than drain (VOUT VIN) when switch disabled. this situation, MIC2546/47 avoids undesirable current flow from OUTX INX. Both pins given channel must connected together. Thermal Shutdown Thermal shutdown shuts output MOSFET signals fault flag temperature exceeds 140°C. 10°C hysteresis prevents switch from turning until temperature drops 130°C. Overtemperature detection functions only when switch enabled. MIC2547 features internal latch which causes part remain after thermal shutdown until reset pulse provided enable pin. While current-limit, thermal shutdown latch prevents on/off cycling output. Refer Figure timing diagram. flag remains until reset. Enable Input must driven logic high logic low, pulled high clearly defined input. Floating input cause unpredictable operation. should allowed negative with respect GND, VENX should less than equal VINX.
230V RSETX ILIMITX
where: RSET 2.29k example, nominal current-limit, RSET calculated 230V
Current through RSETX increases with current. voltage across RSETX could monitored with high impedance comparator provide indication output current. RSETX should between 2.29k (0.5% resistor value). Short-Circuit Protection event short-circuit, output current will fold back approximately short-circuit current-limit. Fault Flag FLGX N-channel, open-drain MOSFET output. fault-flag active (low) current-limit thermal shutdown conditions. flag output MOSFET capable sinking 10mA load typically 100mV above ground.
MIC2546/2547
March 2001
MIC2546/2547
RDS(on) (IOUT)2 relate this junction temperature, following equation used: where: junction temperature ambient temperature thermal resistance package Transient Overcurrent Filter inrush current from connection heavy capacitive load cause fault flag fall 10µs 200µs while switch constant-current mode, charging capacitance. Adding optional series resistor-capacitor (RSET2) parallel with RSET, shown Figure allows transient current-limit different value than steady state. typical hot-plug inrush 10µs 20µs. RSET (510mA), RSET2 (2.5A) CSET 100µs) allows transient surge pass 100µs without tripping overcurrent flag (FLG). Power Distribution MIC2546 ideal meeting power distribution requirements. Figure depicts Host application. RSET should value providing current-limit >500mA. accurate current-limit MIC2546 will reduce power supply current requirements. Also, fast reaction short circuit faults prevent voltage droop mobile applications. Printed Circuit Board Hot-Plug MIC2546/47 ideal inrush current-limiters suitable hot-plug applications. integrated charge pump, MIC2546/47 presents high impedance when slowly becomes impedance turns This "softstart" feature effectively isolates power supplies from highly capacitive loads reducing inrush current during hot-plug events.
Applications Information
Supply Filtering 0.1µF bypass capacitor from GND, located near MIC2546 MIC2547, strongly recommended control supply transients. Without bypass capacitor, output short cause sufficient ringing input (from supply lead inductance) damage internal control circuitry. Input transients must exceed absolute maximum supply voltage (VIN even short duration.
4.0V 5.5V
MIC2546-1BM
OUTA FLGA
OUTA ILIMA GNDA FLGB
GNDB OUTB ILIMB OUTB
RSETA
RSETB
Supply Bypassing Power Dissipation device's junction temperature depends several factors such load, layout, ambient temperature package type. Equations that used calculate power dissipation junction temperature found below. Calculation power dissipation accomplished following equation:
4.7µF 1.5k MIC5203-3.3 Regulator 100k 3.3V Controller ON/OFF MIC2546-2BM FLGA OUTA GNDA FLGB 120µF VBUS 0.01µF Ferrite Bead Downstream Port 4.75V min. 500mA max. Ferrite Bead VBUS OUTA ILIMA 100k
VBUS
RSET
0.01µF 120µF
OVERCURRENT
Downstream Port 4.75V min. 500mA max.
RSET
GNDB OUTB ILIMB OUTB
Bold lines indicate 0.1" wide, 1-oz. copper high-current traces.
RSET(2) CSET
(optional)
Figure Host Application
March 2001
MIC2546/2547
MIC2546/2547
Package Information
0.157 (3.99) 0.150 (3.81)
DIMENSIONS: INCHES (MM)
0.020 (0.51) 0.050 (1.27)
0.020 (0.51) 0.013 (0.33) 0.0098 (0.249) 0.0040 (0.102)
0°-8° 0.050 (1.27) 0.016 (0.40) 0.244 (6.20) 0.228 (5.79)
0.0648 (1.646) 0.0434 (1.102)
0.394 (10.00) 0.386 (9.80)
SEATING PLANE
16-Pin
Rev.
16-Pin TSSOP (TS)
MICREL INC. 1849 FORTUNE DRIVE
JOSE, 95131
(408) 944-0800
(408) 944-0970
http://www.micrel.com
This information believed accurate reliable, however responsibility assumed Micrel infringement patents other rights third parties resulting from use. license granted implication otherwise under patent patent right Micrel Inc. 2001 Micrel Incorporated
MIC2546/2547
March 2001

MIC2546/2547 Dual Programmable Current Limit Switch Final Informa

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