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MIC2545A/2549A
Micrel
MIC2545A/2549A
Programmable Current Limit High-Side Switch
General Description
The MIC2545A and MIC2549A are integrated high-side power switches optimized for low loss DC power switching and other power management applications, including Advanced Configuration and Power Interface (ACPI). The MIC2545A/49A is a cost-effective, highly integrated solution that requires few external components to satisfy USB and ACPI requirements. Load current management features include a precision, resistor-programmable output current-limit and a soft-start circuit, which minimizes inrush current when the switch is enabled. Thermal shutdown, along with adjustable currentlimit, protects the switch and the attached device. The MIC2545A/49A's open-drain flag output is used to indicate current-limiting or thermal shutdown to a local controller. The MIC2549A has an additional internal latch which turns the output off upon thermal shutdown, providing robust fault control. The enable signal is compatible with both 3V and 5V logic, and is also used as the thermal shutdown latch reset for the MIC2549A. The MIC2545A and MIC2549A are available in active-high and active-low enable versions in 8-pin DIP, SOIC, and TSSOP packages.
Features
* * * * * * * * * * * * * * * * * 2.7V to 5.5V input Adjustable current-limit up to 3A Reverse current flow blocking 90A typical on-state supply current 1A typical off-state supply current 50m maximum on-resistance Open-drain fault flag Thermal shutdown Thermal shutdown output latch (MIC2549A) 2ms (slow) soft-start turn-on, fast turnoff Available with active-high or active-low enable USB power distribution PCI Bus Power Switching Notebook PC ACPI power distribution PC card hot swap applications Inrush current-limiting
Applications
Typical Application
+5V 10k On/Off MIC2545A EN FLG GND ILIM RSET OUT IN OUT IN 0.1F 33F Peripheral
Typical Advanced Configuration and Power Interface (ACPI) Application
UL Recognized Component Micrel, Inc. * 1849 Fortune Drive * San Jose, CA 95131 * USA * tel + 1 (408) 944-0800 * fax + 1 (408) 944-0970 * http://www.micrel.com
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MIC2545A/2549A
Micrel
Ordering Information
Part Number MIC2545A-1BM MIC2545A-1BN MIC2545A-1BTS MIC2545A-2BM MIC2545A-2BN MIC2545A-2BTS MIC2545A-1YM MIC2545A-1YN MIC2545A-1YTS MIC2545A-2YM MIC2545A-2YN MIC2545A-2YTS MIC2549A-1BM MIC2549A-1BN MIC2549A-1BTS MIC2549A-2BM MIC2549A-2BN MIC2549A-2BTS MIC2549A-1YM MIC2549A-1YN MIC2549A-1YTS MIC2549A-2YM MIC2549A-2YN MIC2549A-2YTS Enable Active High Active High Active High Active Low Active Low Active Low Active High Active High Active High Active Low Active Low Active Low Active High Active High Active High Active Low Active Low Active Low Active High Active High Active High Active Low Active Low Active Low Latch* Temperature Range -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C Package 8-lead SOP 8-pin DIP 14-lead TSSOP 8-lead SOP 8-pin DIP 14-lead TSSOP 8-lead SOP 8-pin DIP 14-lead TSSOP 8-lead SOP 8-pin DIP 14-lead TSSOP 8-lead SOP 8-pin DIP 14-lead TSSOP 8-lead SOP 8-pin DIP 14-lead TSSOP 8-lead SOP 8-pin DIP 14-lead TSSOP 8-lead SOP 8-pin DIP 14-lead TSSOP Pb-Free
Pin Configuration
MIC2545A/2549A
EN FLG GND ILIM 1 2 3 4 8 7 6 5 OUT
EN 1
MIC2545A/2549A
14 OUT 13 NC 12 IN 11 NC 10 OUT 9 NC 8 IN
IN
NC 2
OUT
FLG 3
IN
NC 4 GND 5 NC 6 ILIM 7
8-Lead SOP (M) 8-Pin DIP (N)
MIC2545A/2549A (EN) 1 (FLG) 2
LOGIC, CHARGE PUMP
6,8 (OUT) 5,7 (IN)
14-Lead TSSOP (TS)
(ILIM) 4
3 (GND)
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Pin Description
Pin Number SOP, DIP 1 Pin Number TSSOP 1 Pin Name EN Pin Function Enable (Input): Logic-compatible enable input (-1 version is active high, -2 version is active low). High input >1.8V typical; low input <1.4V typical. Do not float. MIC2549A only: Also resets thermal shutdown latch. Fault Flag (Output): Active-low, open-drain output. Indicates overcurrent or thermal shutdown. MIC2549A only: Latched low on thermal shutdown. Ground: Supply return. Current Limit: Sets current limit threshold using an external resistor (RSET) connected to ground. 76.8 < RSET < 459. Supply Input: Output MOSFET drain. Also powers internal circuitry. Both IN pins must be externally connected together. Switch Output: Output MOSFET source. Both OUT pins must be externally connected together. Not internally connected
2
3
FLG
3 4 5, 7 6, 8
5 7 8, 12 10, 14 2,4,6,9,11,13
GND ILIM IN OUT NC
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Absolute Maximum Ratings(1)
Supply Voltage (VIN) .................................................. +7.0V Output Voltage (VOUT) ............................................... +7.0V Output Current (IOUT) ............................... Internally Limited Enable Input (VEN) ......................................... -0.3V to +7V Fault Flag Voltage (VFLG) ........................................... +7.0V Fault Flag Current (IFLG) ............................................ 50mA Storage Temperature (TS) ....................... -65C to +150C Junction Temperature (TJ) ....................... Internally Limited Lead Temperature (soldering 5 sec.) ........................ 260C ESD Rating(3) .......................................................................... 2004V
Operating Ratings(2)
Supply Voltage (VIN) ................................... +2.7V to +5.5V Ambient Temperature Range (TA) ............. -40C to +85C Package Thermal Resistance PDIP (JA) ......................................................... 130C/W SOIC (JA) ......................................................... 160C/W TSSOP (JA)(4) .................................................. 100C/W Current Limit Set Range(5) ................................. 0.5A to 3A
Electrical Characteristics
VIN = +5V; TA = 25C, bold indicates -40C to +85C; unless noted Symbol Parameter Supply Current Condition Switch off, OUT = Switch on, OUT = VEN Enable Input Voltage open(6) open(6) 2.4 Min Typ 0.75 90 1.6 1.5 0.01 0.01 1 35 4V(5) 160 184 230 230 1 1 0.75 2 1.8 25 23 135 120 0.01 latch(7) 1 0 1A(7) 40 4 15 1 50 300 276 10 5 4.9 0.8 1 1 Max 5 125 150 Units A A A V V A A pF m V V A ms ms s s C C A s s s
Enable high transition(6) Enable low transition(6)
Enable Input Current
VEN = VOH(min) = 2.4V VEN = VOL(max) = 0.8V Note 7 IOUT = 500mA ILIMIT = 0.5A to 3A, VOUT = 1V to Switch off, VOUT = 0V RL = 10, CL = 1F, Figures 1a, 1b RL = 10, CL = 1F, Figure 1a, 1b RL = 10, CL = 1F, Figure 1a, 1b RL = 10, CL = 1F, Figure 1a, 1b TJ increasing TJ decreasing VFLG = 5V MIC2549A thermal shutdown MIC2549A(7), Figure 1c ILIMIT = 1A to 2.5A, VOUT = 1V to 4V(5)
Enable Input Capacitance RDS(on) Switch Resistance Current Limit Factor
Output Leakage Current tON tR tOFF tF Output Turn-On Delay Output Turn-On Rise Time Output Turnoff Delay Output Turnoff Fall Time Overtemperature Threshold Shutdown Error Flag Off Current EN Pulse Reset Width tSU VOL
Notes:
VIN to EN Set-Up Current-Limit Response Time Error Flag Output Resistance
VOUT = 0V to IOUT = 2A, ISET = IFLG = 10mA
1. Exceeding the absolute maximum ratings may damage the device. 2. The device is not guaranteed to function outside its operating ratings. 3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF. 4. Assumes 4 layer PCB is used. 5. Current limit is determined by:
ILIMIT = 230 RSET , where RSET is in ohms, and 230 is typical current limit factor in volts.
6. Off is 0.8V and on is 2.4V for the MIC2545A-1 and MIC2549A-1. Off is 2.4V and on is 0.8V for the MIC2545A-2 and MIC2549A-2. The enable input has about 100mV of hysteresis. 7. Guaranteed by design but not production tested. M9999-041204
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Test Circuit
VOUT Device Under OUT Test IOUT RL CL
tr VOUT 10% 90% 90% 10%
tf
Functional Characteristics Test Circuit
Timing Diagrams
50% tOFF tON VOUT 90% 10%
VEN
Figure 1a. MIC2545A/49A-2
VEN
50% tOFF tON
VOUT
90% 10%
Figure 1b. MIC2545A/49A-1
VIN
tSU VEN
Figure 1c. Input-to-Enable Setup Timing
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Output Reset
EN VOUT ILIMIT IDC IOUT FLG
Thermal Shutdown Reached
Short-Circuit Fault
Fault Removed
Figure 2a. MIC2549A-2 Timing: Output Is Reset By Toggling EN
EN VOUT ILIMIT IDC IOUT FLG
Short-Circuit Fault Fault Removed
Thermal Shutdown Reached
Figure 2b. MIC2545A-2 Timing
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Typical Characteristics
Output On-Resistance vs. Supply Voltage
OUTPUT RESISTANCE (m)
OUTPUT RESISTANCE (m)
Output On-Resistance vs. Temperature
50 45 40 35 30 25 -40 -20 0 20 40 60 80 100 TEMPERATURE (C) 2.7V 3.3V
SUPPLY CURRENT (A)
On-State Supply Current vs. Supply Voltage
140 120 100 80 60 40 20 0 2.5 3.0 3.5 4.0 4.5 5.0 SUPPLY VOLTAGE (V) 5.5 TA = 27C
40 39 38 37 36 35 34 33 32 31 30 2.5 3.0 3.5 4.0 4.5 5.0 SUPPLY VOLTAGE (V) 5.5 TA = 27C
5.0V
On-State Supply Current vs. Temperature
140 SUPPLY CURRENT (A)
SUPPLY CURRENT (A)
Off-State Supply Current vs. Temperature
0.5
SUPPLY CURRENT (A)
Off-State Supply Current vs. Supply Voltage
0.10 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 2.5 3.0 3.5 4.0 4.5 5.0 SUPPLY VOLTAGE (V) 5.5 TA = 27C
120 100 80 60 40 20 0 -40 -20 0 20 40 60 80 100 TEMPERATURE (C) 3.3V 2.7V 5.0V
RL = 44 0.4 0.3 5.0V 0.2 3.3V 0.1 2.7V
0 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
Control Threshold Voltage vs. Supply Voltage
2.0 1.9
Control Threshold Voltage vs. Temperature
4.0 OUTPUT RISE TIME (ms) 3.5 3.0 2.5 2.0 1.5 1.0 0.5 CONTROL THRESHOLD (V) 1.8 1.7 1.6 1.5 1.4 1.3 1.2 1.1 -40 -20 0 20 40 60 80 100 TEMPERATURE (C) LOW HIGH
Rise Time vs. Temperature
2.7V
THRESHOLD VOLATAGE (V)
1.9 1.8 1.7 1.6 1.5 1.4 1.3 1.2 1.1 1.0 2.5 LOW HIGH
TA = 27C
3.3V 5.0V
RL = 44
3.0 3.5 4.0 4.5 5.0 SUPPLY VOLTAGE (V)
5.5
0 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
Output Fall Time vs. Temperature
1.8
3500
Current Limit vs. Rset
3500 OUTPUT CURRENT (mA)
VIN = 5V 3000 2500 2000 1500 1000 500 0 ISHORT 0 150 300 RSET () 450 600 ILIMIT ITH
Output Current vs. Output Voltage
3000 2500 2000 1500 1000 500 0 RSET = 460 0 1.0 2.0 3.0 4.0 5.0 OUTPUT VOLTAGE (V) 6.0 RSET = 230 VIN = 5V RSET = 92
OUTPUT FALL TIME (s)
1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2
3.3V 5.0V
0 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
April 2004
CURRENT LIMIT (mA)
RL = 44 CL = 0F
2.7V
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Typical Characteristics cont'd
Current Limit vs. Temperature
OUTPUT CURRENT (mA) 1500 1400 1300 1200 1100 1000 900 800 700 ISHORT ITH ISET 1200
CURRENT LIMIT (mA)
Current Limit vs. Supply Voltage
ITH ISET 1100 1000 900 800 700 600 2.5 3.0 3.5 4.0 4.5 5.0 SUPPLY VOLTAGE (V) 5.5 ISHORT TA = 27C RL = 230
VIN = 5V RSET = 230
600 500 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
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Functional Characteristics
VOUT VFLG VEN (2V/div.) (10V/div.) (10V/div.)
Turn-On Response
VFLG VEN (10V/div.) (10V/div.)
Turn-Off Response
VIN = 5V CL = 100 F RL = 10
VOUT (2V/div.)
500mA
IOUT (200mA/div.)
IOUT (200mA/div.)
VIN = 5V CL = 100F RL = 10 MIC2545A-1 TIME (500s/div.)
500mA
MIC2545A-1 TIME (1ms/div.)
VFLG VEN (10V/div.) (10V/div.)
Load Removed Thermal Shutdown Current-Limit Threshold 1.12A (ITH) ISET = 1A C = 5V RL = 1
VFLG VEN (10V/div.) (10V/div.)
Current-Limit Response
Short-Circuit Response
Short Circuit
VOUT (5V/div.)
VOUT (5V/div.)
IOUT (500mA/div.)
IOUT (500mA/div.)
Current-Limit Threshold 1.12A Short-Circuit Current 820mA (ISHORT) Thermal Shutdown MIC2545A-1 VIN = 5V
MIC2545A-1 TIME (100ms/div.)
TIME (100ms/div.)
Enable Into Short Circuit
VFLG VEN (10V/div.) (10V/div.) VFLG VEN (10V/div.) (10V/div.)
Inrush Current Response
VOUT (5V/div.)
VIN = 5V RL = 10 CL = 490F CL = 130F
IOUT (500mA/div.)
IOUT (500mA/div.)
Thermal Shutdown
Short-Circuit Current 820mA VIN = 5V RSET = 240
CL = 10F MIC2545A-1 TIME (500s/div.)
MIC2545A-1 TIME (100ms/div.)
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Functional Characteristics cont'd
Thermal Shutdown (Output Reset by Toggling Enable--MIC2549-1)
VEN VFLG (5V/div.) (10V/div.)
Ramped Load to a Short VOUT (5V/div.)
Output Reset Output Latched
IOUT (500mA/div.)
Thermal Shutdown
VIN = 5V CL = 47F
TIME (100ms/div.)
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Block Diagram
EN IN OSC. THERMAL SHUTDOWN 1.2V REFERENCE IN
CHARGE PUMP GATE CONTROL
CURRENT LIMIT
ILIM RSET
RESET
THERMAL SHUTDOWN LATCH (MIC2549A)
OUT OUT FLG
GND
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The current-limit response of the MIC2545A/49A is based on the type of load that is applied to the output and is defined in three parts: 1. The first mode of operation is where the device enters a constant-current mode preventing further increases in output current. The value of this current, ILIMIT, is defined by the value of RSET as explained further in this section. 2. When a short circuit is applied to the output of an enabled device the output current immediately folds back to a value less than ILIMIT called ISHORT. This further protects the load and reduces device power dissipation. Refer to the "Typical Characteristics: Output Current vs. Output Voltage" graph for details. 3. When a load is increased, the output current will proportionally increase up to the current-limit threshold, ITH, as shown in the "Functional Characteristics: Current-Limit Response" graph. The device in this case will supply current slightly higher than the current-limit set point defined by RSET. As the load is increased further the current folds back to ILIMIT. The nominal current-limit value, ILIMIT, is set with an external resistor between ILIM (pin 4) and GND (pin 3). For a desired current-limit, the value of the external set resistor is given by:
230 RSET = ILIMIT
Functional Description
The MIC2545A and MIC2549A are high-side N-channel switches available with active-high or active-low enable inputs. Fault conditions turn off or inhibit turn-on of the output transistor and activate the open-drain error flag transistor making it sink current to ground. Input and Output IN is the power supply connection to the logic circuitry and the drain of the output MOSFET. OUT is the source of the output MOSFET. In a typical circuit, current flows from IN to OUT toward the load. If VOUT is greater than VIN, current will flow from OUT to IN since the switch is bidirectional when enabled. The output MOSFET and driver circuitry are also designed to allow the MOSFET source to be externally forced to a higher voltage than the drain (VOUT > VIN) when the switch is disabled. In this situation, the MIC2545A/49A avoids undesirable current flow from OUT to IN. Both IN pins must be connected together, and both OUT pins must be connected together. Thermal Shutdown Thermal shutdown shuts off the output MOSFET and signals the fault flag if the die temperature exceeds 135C. 10C of hysteresis prevents the switch from turning on until the die temperature drops to 125C. Overtemperature detection functions only when the switch is enabled. The MIC2549A features an internal latch which causes the part to remain off after thermal shutdown until a reset pulse is provided via the enable pin (pin 1). While in current-limit, the thermal shutdown latch prevents on/off cycling of the output. Refer to Figure 2 for timing diagram. The flag remains low until reset. Enable Input EN must be driven logic high or logic low, or be pulled high or low for a clearly defined input. Floating the input may cause unpredictable operation. EN should not be allowed to go negative with respect to GND. Current-Limit Operation The current limit is user adjustable with an external set resistor. Current limiting in the range of 500mA to 3A is available with a set point accuracy of better than 30% (20% for ISET 1 to 2.5A). The current-limit circuit prevents damage to the output MOSFET and external load.
where: 76.8 < RSET < 459 For example, to set a 1A nominal current-limit, RSET is calculated as: 230 = 230 1A Refer to the "Typical Characteristics: Current-Limit vs RSET" graph for more details. Current through RSET increases with output current. The voltage across RSET could be monitored with a high impedance comparator to provide an indication of output current. RSET should be between 76.8 and 459 (1% resister value). Fault Flag FLG is an N-channel, open-drain MOSFET output. The faultflag is active (low) for current-limit or thermal shutdown conditions. The flag output MOSFET is capable of sinking a 10mA load to typically 100mV above ground. For applications with VIN 3.6V, it is recommended that flag current be limited to 5mA or less.
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TJ = junction temperature TA = ambient temperature Transient Overcurrent Filter The inrush current from the connection of a heavy capacitive load may cause the fault flag to fall for 10s to 200s while the switch is in a constant-current mode, charging the capacitance. Adding an optional series resistor-capacitor (RSET2) in parallel with RSET, as shown in Figure 4, allows the transient current-limit to be set to a different value than steady state. A typical USB hot-plug inrush is 2A to 3A for 10s to 20s. If RSET is 435 (530mA), an RSET2 of 88 (2.5A) and CSET of 1F (RC 90s) allows transient surge of 3A to pass for 90s without tripping the overcurrent flag (FLG). USB Power Distribution The MIC2545A is ideal for meeting USB power distribution requirements. Figure 7 depicts a USB Host application. RSET should be set to a value providing a current-limit >500mA. The accurate current-limit of the MIC2545A will reduce power supply current requirements. Also, fast reaction to short circuit faults prevent voltage droop in mobile PC applications. Printed Circuit Board Hot-Plug The MIC2545A/49A is an ideal inrush current-limiter suitable for hot-plug applications. Due to the integrated charge pump, the MIC2545A/49A presents a high impedance when off and slowly becomes a low impedance as it turns on. This "softstart" feature effectively isolates power supplies from highly capacitive loads by reducing inrush current during hot-plug events. Figure 5 shows how the MIC2545A may be used in a hot-plug application. JA = is the thermal resistance of the package
Applications Information
Supply Filtering A 0.1F to 1F bypass capacitor from IN to GND, located near the MIC2545A and MIC2549A, is strongly recommended to control supply transients. Without a bypass capacitor, an output short may cause sufficient ringing on the input (from supply lead inductance) to damage internal control circuitry. Input transients must not exceed the absolute maximum supply voltage (VIN (max) = 6V) even for a short duration.
4.0V to 5.5V MIC2549A-1BM
1 2 3 4
EN FLG GND ILIM
OUT IN OUT IN
8 7 6 5
0.1F to 1F
RSET
Figure 3. Supply Bypassing Power Dissipation The device's junction temperature depends on several factors such as the load, PCB layout, ambient temperature, and package type. Equations that can be used to calculate power dissipation and junction temperature are found below. Calculation of power dissipation can be accomplished by the following equation: PD = RDS(on) x (IOUT)2 To relate this to junction temperature, the following equation can be used: TJ = PD x JA + TA where:
5V (+) 4.7F (-) VBUS D+ D- GND 1.5k 2% D+ D- Bold lines indicate 0.1" wide, 1-oz. copper high-current traces. GND RSET RSET(2) CSET (optional) MIC5203-3.3 LDO Regulator IN OUT GND 1.0 F 10k 3.3V USB Controller V+ ON/OFF OVERCURRENT 0.1F MIC2545A-2 EN FLG GND ILIM OUT IN OUT IN 0.1F 120F
Ferrite Bead VBUS D+ 0.01F D- GND Downstream USB Port 1 4.75V min. 500mA max.
Figure 4. USB Host Application
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MIC2545A-2 VCC 0.1 F
1 2
EN FLG GND ILIM
OUT IN OUT IN
8 7 6 5
to "Hot" Receptacle
3 4
Backend Function CBULK
GND
0.1F Adaptor Card
Figure 5. Hot-Plug Application
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Package Information
PIN 1 DIMENSIONS: INCH (MM)
0.380 (9.65) 0.370 (9.40)
0.135 (3.43) 0.125 (3.18)
0.255 (6.48) 0.245 (6.22) 0.300 (7.62)
0.013 (0.330) 0.010 (0.254) 0.018 (0.57) 0.100 (2.54) 0.130 (3.30) 0.0375 (0.952) 0.380 (9.65) 0.320 (8.13)
8-Pin DIP (N)
0.026 (0.65) MAX)
PIN 1
0.157 (3.99) 0.150 (3.81)
DIMENSIONS: INCHES (MM)
0.050 (1.27) TYP
0.020 (0.51) 0.013 (0.33) 0.0098 (0.249) 0.0040 (0.102) 0-8 SEATING PLANE 45 0.010 (0.25) 0.007 (0.18)
0.064 (1.63) 0.045 (1.14)
0.197 (5.0) 0.189 (4.8)
0.050 (1.27) 0.016 (0.40) 0.244 (6.20) 0.228 (5.79)
8-Pin SOIC (M)
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4.50 (0.177) 6.4 BSC (0.252) 4.30 (0.169)
DIMENSIONS: MM (INCH)
0.30 (0.012) 0.19 (0.007) 5.10 (0.200) 4.90 (0.193) 1.10 MAX (0.043) 0.20 (0.008) 0.09 (0.003)
0.65 BSC (0.026)
0.15 (0.006) 0.05 (0.002)
8 0
1.00 (0.039) REF 0.70 (0.028) 0.50 (0.020)
14-Pin TSSOP (TS)
MICREL INC. 1849 FORTUNE DRIVE
TEL
SAN JOSE, CA 95131
WEB
USA
+ 1 (408) 944-0800
FAX
+ 1 (408) 474-1000
http://www.micrel.com
This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc. (c) 2004 Micrel Incorporated M9999-041204
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