DUAL POWER SWITCH Power Management GM2526 dual high-side int

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DUAL POWER SWITCH Power Management GM2526 dual high-side int

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GM2526
DUAL POWER SWITCH
Power Management
GM2526 dual high-side integrated power switch with independent enable flag functions, designed self- Powered bus-powered Universal Serial (USB) applications. GM2526 requires external components. Each switch channels supplies 500mA required downstream devices. Each switch's on-resistance meets voltage drop requirements. Fault current 750mA (typical), well below 25VA safety requirements. flag output indicates fault conditions local controller. soft-start feature prevents transient voltage drop upstream port that occur when switch enabled buspowered applications. Thermal shutdown protection prevents switch failure from high-current loads. Undervoltage lockout (UVLO) hold GM2526 unless there correct input voltage. GM2526 3.3V logic-compatible Enable inputs. GM2526 available Active-High Active-Low versions comes 8-pin SOIC packages.
Features
Compliant Specifications Independent Switches Input from 5.5V Min. Continuous Load Current 500mA port Max. ON-Resistance 140mW Max. Short Circuit Current Limit 1.25A Individual Open-Drain Fault Flag Pins ON-State Supply Current 110µA (typ.) OFF-State Supply Current (typ.) Thermal Shutdown Undervoltage Lockout (UVLO) Typically 2.4V Turn-ON (soft-start) Fast Turn-OFF Active-High Active-Low Enable Versions
Application
Power Management Host- Self-Powered Hubs Bus-Powered Hubs Plug-In Power Supplies Battery-Charger Circuits
CONNECTION DIAGRAM
OUTA FLGA LOGIC, CHARGE PUMP FLGB LOGIC, CHARGE PUMP OUTB
www.gammamicro.com
PRELIMINARY
GM2526
Revision Feb. 2004
GM2526
MARKING INFORMATION CONFIGURATIONS
SOP-8(SO-8)
OUTA OUTB
GM2526 ALYWW
FLGB
FLGA
(TOP VIEW)
Assembly Location Wafer Lote Year Work Week
ORDERING INFORMATION
Ordering Number
GM2526HS8T GM2526HS8R GM2526LS8T GM2526LS8R
Package
Shipping
Units Tube 2,500 Units Tape Reel Units Tube 2,500 Units Tape Reel
detail Ordering Number identification, please last page.
DESCRIPTION
NUMBER SYMBOL EN(A/B) FUNCTION Enable (Input): Logic-compatible enable input. High input 2.1V typical input 1.9V typical active high, active low). float. Fault Flag (Output): Active-low, open-drain output. Indicates overcurrent, UVLO, thermal shutdown. Ground: Supply return. Supply Input: Output MOSFET drain. Also supplies IC's internal circuitry. Connect positive supply. Switch Output: Output MOSFET source. Typically connect switched side load.
FLG(A/B)
GM2526
OUT(A/B)
GM2526
BLOCK DIAGRAM
GM2526
FLGA
OUTA Charge Pump Gate Control Current Limit Thermal Shutdown
OSC.
UVLO
1.2VReference
Charge Pump
Current Limit Gate Control OUTB FLGB
FUNCTIONAL CHARACTERISTICS TEST CIRCUIT
0.1µF GM2526 FLGA FLGB OUTA OUTB IOUT Ferrite Bead output shown)
GM2526
ILOAD (For Current Limit Response)
GM2526
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Supply Voltage Fault Flag Voltage Output Voltage Fault Flag Current Output Current Control Input Storage Temperature Range Lead Temperature (Soldering secretary.) Rating**
SYMBOL
VFLG VOUT IFLG IOUT
VALUE
Internally limited -0.3 +150
UNITS
Exceeding absolute maximum rating damage device will adversely affect reliability. Always operate GM2526 within "Recommended Operating Conditions" (below). Devices sensitive. Handling precautions recommended. Human body model, 1.5k series with 100pF.
RECOMMENDED OPERATING CONDITIONS*
PARAMETER
Supply Voltage Ambient Operating Temperature Range Thermal Resistance SOIC Package Thermal Resistance Package
SYMBOL
RqJA RqJA
UNITS
GM2526 guaranteed function outside these operating ranges.
GM2526
GM2526
ELECTRICAL CHARACTERISTICS 25°C (unless otherwise noted)
0.75 ±0.01 0.75
CHARACTERISTICS
Supply Current*
TEST CONDITIONS
Switch off, OUT= open switch OUT= open Low-to-high transition
Unit
1.25
Enable Input Threshold High-to-low transition* Enable Input Current Enable Input Capacitance Switch Resistance* Output Turn- Delay Output Turn- Rise Time Output Turn- Delay Output Turn- Fall Time Output Leakage Current Continuous Load Current Short-Circuit Current Limit VEN= 5.5V VIN= IOUT= 500mA, each switch VIN= 3.3V IOUT= 500mA, each switch each output each output each output each output each output (output disabled) each output each output (enable into load), VOUT= 4.0V ramped load applied enabled output, VOUT 4.0V increasing decreasing =5V, =10mA =3.3V, =10mA Error Flag Current UVLO Threshold VFLG increasing =decreasing 2.4V GM2526-H. 2.4V, ENABLE input approximately 200mV hysteresis.
Current-Limit Threshold
0.01
Overtemperature Shutdown Threshold
Error Flag Output Resistance
GM2526-L.
GM2526
GM2526 FUNCTIONAL DESCRIPTION
GM2526-H (active-high) GM2526-L (active-low) dual high-side switches with. Fault conditions turn inhibit turn-on) more output transistors, depending upon type fault, activate open-drain error flag transistors, sinking current ground.
Input Output
(input) power supply connection logic circuitry drain output MOSFET. OUTx (output) source respective MOSFET. typical application, current flows through switch from toward load. VOUT greater than when switch enabled, current will flow from since MOSFET bidirectional when active. output MOSFET driver circuitry also designed allow MOSFET source externally forced higher voltage than drain (VOUT VIN) when output off. this situation, GM2526 avoids undesirable current flow from falls below 2.5V, UVLO disables both switches.
Thermal Shutdown
Thermal shutdown shuts affected output MOSFETs signals fault flags temperature exceeds 135°C. Hysteresis 10°C pre-vents switch from turning until temperature drops 125°C. Note: over-temperature detection functions only when least switch enabled.
Current Limit Induced Thermal Shutdown
GM2526 raises output MOSFET on-resistance until series combination MOSFET onresistance load impedance limit current 850mA (typ.). Normally increased power dissipation will activate thermal shutdown, disabling affected channels GM2526. prefer avoid this, respond fault disable current limited channel externally before GM2526 reaches shutdown temperature. time between flag indicating current limit fault thermal shutdown depends ambient temperature, board layout, load impedance, will have typically hundred milliseconds. want GM2526 into thermal shutdown, controller recognize fault disable appropriate channel within this time. fault removed switch disabled within this time, then GM2526 will experience thermal oscillation about 2Hz. This does damage GM2526.
Undervoltage Lockout
UVLO prevents output MOSFET from turning until exceeds approximately 2.5V. Until turn-on, FLAG will low. After switch turns voltage drops below approximately 2.3V, UVLO signals fault flag shuts output MOSFET. Undervoltage detection functions only when least switch enabled.
Current Sensing Limiting
current-limit threshold preset internally. preset level prevents damage output MOSFET external load allows minimum current 0.5A through each channel's output MOSFET. current-limit circuit senses portion output MOSFET switch current. current sense resistor shown block diagram virtual voltage drop. reaction overcurrent condition varies according circumstances: switch powered enabled into heavy load short-circuit, switch immediately goes into constant-current mode, reducing output voltage. fault flag goes until load reduced. When heavy load applied, large transient current flow until current limit circuitry responds, which point device limits current less than short-circuit current limit specification. GM2526 current-limit profile exhibits small (~500mA) foldback effect. Once past current-limit threshold, GM2526 operates constant-current mode (see "short circuit current limit" Electrical Characteristics). Note, GM2526 will deliver load current current-limit threshold, typically 1.6A.
GM2526
Fault Flag
N-channel, open-drain MOSFET output. faultflag active (low) more following conditions: undervoltage 2.7), current limit, thermal shutdown. flag output MOSFET sink 10mA load 100mV (typically) above ground. "wire NOR" multiple pins common pull-up resistor.
GM2526 APPLICATION INFORMATION Supply Filtering
control supply transients, place 0.1µF bypass capacitor from right GM2526. Without this bypass capacitor, output short cause ringing from supply lead inductance input damage internal control circuitry. Input output transients must never exceed absolute maximum supply voltage (VIN 6V).
5.5V
0.1µF FLGA FLGB OUTA OUTB
GM2526
Figure1. Supply Bypassing
Enable Input
must driven logic high logic clearly defined input. Floating input will have unpredictable (but certainly undesirable) results. must never allowed negative with respect GND.
Soft Start
GM2526 high impedance when off, which gradually shifts impedance chip turns This reduces inrush current voltage drop which occur when charging capacitive load, thus meeting voltage drop requirements bus-powered applications shown Figure soft start circuit shown Figure meet transient regulation specifications with large load capacitances (CBULK 10uF). GM2526 provides inrush current limiting these applications
Transient Overcurrent Filter
When GM2526 turned large capacitance values output GM2526 cause inrush current cross GM2526's short circuit current-limit threshold assert flag. duration this situation depends value output capacitance.
Controller OVERCURRENT
GM2526 FLGA FLGB OUTA OUTB
0.1µF
Figure Transient Filter While capacitors charging, GM2526 enters Into constant-current mode. capacitance charged, current decreases below short circuit current-limit threshold, flag deasserted. applications, output bulk capacitance must used support hot-plug events. When GM2526 enabled, flag active about inrush current exceeding current-limit setpoint. During hot-plug events, inrush currents also cause flag active about 30µs. Since these situations relevant overcurrent faults, controller must ignore flag during these events. prevent needless overcurrent reporting, filter shown Figure program debounce routine programmed into logic controller.
GM2526
GM2526
Controller GM2526 VBUS FLGA 4.7µF FLGB OUTA OUTB 0.1µF CBULK Capacitive Load
Cable
Cable Powered
Figure SOFT START (Single Channel)
Controller GM2526 VBUS FLGA 4.7µF FLGB OUTA OUTB CBULK
Cable
Function CBULK
Function
Peripheral
GM2526
Figure INRUSH CURRENT- LIMIT APPLICATION
GM2526
SOP-8(SO-8) PACKAGE OUTLINE DIMENSIONS
0.008 +0.0018 -0.0005
0.028
+0.022 -0.013 +0.56 -0.33
(0.20
+0.05 -0.01
(0.71
Layout
0.060 1.52
0.236 0.008
0.154
+0.003 -0.004
(5.99
+0.21 -0.20
0.275
0.155
INDENT
(3.91 0.1)
0.024
0.050 1.270
Inches
0.191
+0.004 -0.002 +0.10 -0.05
(4.85
0.063 0.005 (1.60 0.13)
0.057 (1.45)
Inches
0.0025 0.0015 (0.175 0.075)
0.050 (1.270)
0.016
+0.004 -0.003 +0.10 -0.08
(0.41
ORDERING NUMBER
2526
Gamma Micro. Shipping Tape Reel Tube
Circuit Type Package SO-8
Active level Active level Active level
GM2526

DUAL POWER SWITCH Power Management GM2526 dual high-side int

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