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Kingbor Technology Co.,Ltd
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KB3436
600mA, 650kHz Micropower Synchronous Boost Converter with Output Disconnect FEATURES
Up to 96% efficiency Low start-up voltage 0.8V Internal synchronous rectifier Up to 2MHz switching allows for tiny external components 0.5V to 4.4V input range 2.5V to 5.0V output range (Note 3) Feedback Voltage: 1.00V +/-2% Logic controlled shutdown (<1A) Low 250A operating supply current (measured at VOUT) Pulse skipping at light load for extended battery life Generates 3.3V at 100mA from single AA cell Stable with ceramic output capacitor Low profile 6-Leads SOT23-6 package
DESCRIPTION
converter delivering high efficiency in a SOT23-6 package. The device has an internal NMOS switch and PMOS synchronous rectifier and has the capacity of supplying 3.3V at 100mA from a single AA cell input. High frequency switching (up to 2MHz) minimizes the board area by allowing the use of tiny, low profile inductors and ceramic capacitors. The KB3436 provides automatic pulse skipping at light loads, thus reducing the supply current for extended battery life. At shutdown, the KB3436 fully discharges the output to ground and draws no supply current. The KB3436 is available in small SOT23-6 package with both fixed and adjustable output voltage versions.
APPLICATIONS
PDAs and organizers Digital cameras Wireless mice/ keyboards Portable medical equipment Cordless phones Wireless Headsets
TYPICAL APPLICATION
100
4.7H
2-Cell to 3.3V Efficiency
100 VIN = 3V 90
VOUT 3.3V 250mA 4.7F 200K
EFFICIENCY (%)
+
EFFICIENCY VIN = 2.4V
10
POWER LOSS (W)
2-CELL AA
4.7F VIN
SW VOUT 460K FB
80 70 60 50 40 0.1
1 0.1 VIN = 3V 0.01
KB3436 OFF ON SHDN GND
VIN = 2.4V
POWER LOSS 0.001 0.0001 1000
Figure 1. 2-Cell to 3.3V Synchronous Boost Converter
1 10 100 OUTPUT CURRENT (mA)
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KB3436
PACkAGE/ORDER INFORMATION
TOP VIEW SW 1 GND 2 FB 3
ABSOLUTE MAXIMUM RATINGS
VIN Voltage .............................................. - 0.3V to 4.4V SW Voltage ................................................. - 0.3V to 6V SHDN, FB Voltage ....................................... - 0.3V to 6V VOUT ........................................................... - 0.3V to 6V Operating Temperature Range ................ - 40C to 85C Storage Temperature Range ................... - 65C to 150 Lead Temperature (Soldering, 10 sec).................. 300C
ORDER PART NUMBER
6V IN 5V OUT 4 SHDN
KB3436 TOP MARKING DGABF
TJMAX = 125C,
DGABF
JC
= 102C/W
The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VIN = 1.2V, VOUT = 3.3V, unless otherwise specified.
PARAMETER Minimum Start-Up Voltage Minimum Operating Voltage Output Voltage Adjust Range Feedback Voltage +/-2% Feedback Input Current Quiescent Current (Burst Mode Operation) Quiescent Current (Shutdown) Quiescent Current (Active) NMOS Switch Leakage PMOS Switch Leakage NMOS Switch On Resistance PMOS Switch On Resistance NMOS Current Limit Burst Mode Operation Current Threshold Current Limit Delay to Output Max Duty Cycle Switching Frequency SHDN Input High SHDN Input Low SHDN Input Current Soft-Start Time VSHDN = 5.5V SHDN to 90% of VOUT 0.01 2.5 VFB = 0.9V

ELECTRICAL CHARACTERISTICS
CONDITIONS
MIN
TYP 0.80 0.5
MAX 0.65 5 1.020 50 30 1 500 5 5
UNITS V V V V nA A A A A A
ILOAD = 1mA, VOUT = 0V SHDN = VIN (Note 3) (Note 5)
2.5 0.980 1.000 1 20 0.01 350 0.1 0.1 0.35 0.45 600 850 1.25 40 80 500 1 90 650
VFB = 1.05V VFB = 1.2V (Note 4) VSHDN = 0V, Not Including Switch Leakage, VOUT = 0V Measured on VOUT, Nonswitching VSW = 5V VSW = 5V, VOUT = 0V
mA mA ns % 800 0.35 1 kHz V V A ms
L = 4.7H (LTC3429 Only)
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Efficiency vs Input Voltage
TYPICAL PERFORMANCE CHARACTERISTICS (TA = 25C unless otherwise specified)
Single-Cell to 3.3V Efficiency
100 90 100 10 100 VIN = 3V VIN = 1.5V EFFICIENCY VIN = 1.2V 70 60 VIN = 1.5V POWER LOSS 50 40 0.1 POWER LOSS 0.001 0.0001 1000 50 40 0.1 0.001 0.0001 1000 50 40 0.5 1.5 2.5 3.5 INPUT VOLTAGE (V) 4.5 VIN > VOUT PMOS LDO MODE VIN = 1.2V 0.1 0.01 90 EFFICIENCY VIN = 2.4V 10 90
2-Cell to 3.3V Efficiency
100 100 VOUT = 3.3V IOUT = 50mA
POWER LOSS (W)
POWER LOSS (W)
EFFICIENCY (%)
EFFICIENCY (%)
EFFICIENCY (%)
80
1
80 70 60
1 0.1 VIN = 3V 0.01
80 70 60
VIN = 2.4V
1 10 100 OUTPUT CURRENT (mA)
1 10 100 OUTPUT CURRENT (mA)
2-Cell to 5V Efficiency
100 90 VIN = 3V EFFICIENCY VIN = 2.4V VIN = 2.4V VIN = 3V 60 POWER LOSS 50 40 0.1 0.001 0.0001 1000 50 0.01 100 10 100
Li-Ion to 5V Efficiency
100 VIN = 4.2V 90 EFFICIENCY VIN = 3.6V 10
Burst Mode Output Current Threshold vs Input Voltage
35 30 L = 4.7H
OUTPUT CURRENT (mA)
EFFICIENCY (%)
EFFICIENCY (%)
80 70
1 0.1
80 70 60
1 0.1 VIN = 4.2V POWER LOSS 0.01
25 20 VOUT = 3.3V 15 VOUT = 5V 10 5 0 0.9
POWER LOSS (W)
POWER LOSS (W)
VIN = 3.6V
0.001 0.0001 1000
1 10 100 OUTPUT CURRENT (mA)
40 0.1
1 10 100 OUTPUT CURRENT (mA)
1.4
3.4 1.9 2.4 2.9 INPUT VOLTAGE (V)
3.9
4.4
No Load Input Current vs Input Voltage
1000 L = 4.7H
Maximum Load Current Capability at Output 4% Below Regulation Point
600 500 L = 4.7H
1.9 1.7
INPUT VOLTAGE (V)
Minimum Start-Up Input Voltage vs Load Current
CURRENT SINK LOAD
OUTPUT CURRENT (mA)
INPUT CURRENT (A)
400 VOUT = 3.3V 300 VOUT = 5V 200 100
1.5 1.3 1.1 0.9 0.7 RESISTOR LOAD
VOUT = 5V 100
VOUT = 3.3V
10 0.9
1.4
1.9 2.4 2.9 3.4 INPUT VOLTAGE (V)
3.9
4.4
0 0.5
1
3 3.5 1.5 2 2.5 INPUT VOLTAGE (V)
4
4.5
0
50 100 OUTPUT CURRENT (mA)
150
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KB3436
Burst Mode Quiescent Current vs Temperature
40 35
QUIESCENT CURRENT (A)
TYPICAL PERFORMANCE CHARACTERISTICS (TA = 25C unless otherwise specified)
Output Voltage vs Temperature
3.44 3.40 3.36 VIN = 1.5V IOUT = 30mA
NORMALIZED FREQUECY
Normalized Oscillator Frequency vs Temperature
1.02
1.00
VOUT = 5V 30 25 20 15 10 5 VOUT = 3.3V
VOUT (V)
3.32 3.28 3.24 3.20 3.16 20 40 60 -60 -40 -29 0 TEMPERATURE (C)
0.98
0.96
0.94
80
100
0.92 -60 -40 -20 0 20 40 60 TEMPERATURE (C)
80
100
0 20 40 60 -60 -40 -20 0 TEMPERATURE (C)
80
100
SW Pin Fixed Frequency Continuous Mode Operation
SW Pin Discontinuous Mode Antiringing Operation
Fixed Frequency and Burst Mode Operation
VSW 1V/DIV
VSW 1V/DIV
VOUT 100mV/DIV AC-COUPLED 50mA IOUT 120A
VIN = 1.5V VOUT = 3.3V IOUT = 50mA L = 10H COUT = 10F CPL = 150pF
200ns/DIV
VIN = 1.5V VOUT = 3.3V IOUT = 20mA L = 10H COUT = 10F CPL = 150pF
200ns/DIV
VIN = 1.5V 5ms/DIV VOUT = 3.3V IOUT = 120A TO 50mA STEP L = 10H COUT = 10F CPL = 150pF
Output Voltage Transient Response
Inrush Current Control and Soft-Start
Inrush Current Control and Soft-Start
VOUT 1V/DIV VOUT 100mV/DIV AC-COUPLED 90mA IOUT 40mA VIN = 1.5V 100s/DIV VOUT = 3.3V IOUT = 40mA TO 90mA STEP L = 10H COUT = 10F CPL = 150pF INDUCTOR CURRENT 100mA/DIV
VOUT 2V/DIV
INDUCTOR CURRENT 200mA/DIV VIN = 1.5V VOUT = 3.3V IOUT = 10mA L = 4.7H COUT = 10F CPL = 100pF 500s/DIV VIN = 2.5V VOUT = 5V IOUT = 50mA L = 4.7H COUT = 10F CPL = 100pF 2ms/DIV
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KB3436
SHDN = Low: Shutdown, quiescent current < 1A. Output capacitor can be completely discharged through the load or feedback resistors. A 150 resistor is internally connected between SW and VIN. VOUT (Pin 5): Output Voltage Sense Input and Drain of the Internal Synchronous Rectifier MOSFET. Bias is derived from VOUT. PCB trace length from VOUT to the output filter capacitor(s) should be as short and wide as possible. VOUT is completely disconnected from VIN when SHDN is low due to the output disconnect feature. VIN (Pin 6): Battery Input Voltage. The device gets its start-up bias from VIN. Once VOUT exceeds VIN, bias comes from VOUT. Thus, once started, operation is completely independent from VIN. Operation is only limited by the output power level and the battery's internal series resistance.
PIN FUNCTIONS
SW (Pin 1): Switch Pin. Connect inductor between SW and VIN. Keep these PCB trace lengths as short and wide as possible to reduce EMI and voltage overshoot. If the inductor current falls to zero, or SHDN is low, an internal 150 antiringing switch is connected from SW to VIN to minimize EMI. GND (Pin 2): Signal and Power Ground. Provide a short direct PCB path between GND and the (-) side of the output capacitor(s). FB (Pin 3): Feedback Input to the gm Error Amplifier. Connect resistor divider tap to this pin. The output voltage can be adjusted from 2.5V to 5V by: VOUT = 1.00V * [1 + (R1/R2)] SHDN (Pin 4): Logic Controlled Shutdown Input. SHDN = High: Normal free running operation, 650kHz typical operating frequency.
SIMPLIFIED BLOC DIAGRAM
L1
+
1V TO 4.4V
6 VIN
CIN VOUT GOOD START-UP OSC A B A/B MUX
1 SW
PWM CONTROL RAMP GEN 650kHz PWM COMPARATOR
SYNC DRIVE CONTROL
SLOPE COMP
SLEEP
Burst Mode OPERATION CONTROL
CC 150pF
CP2 2.5pF
SHDN 4 SHUTDOWN CONTROL SHUTDOWN
2 GND
+
RC 80k
gm ERROR AMP
-
-
+
VIN 2.3V 0.45 WELL SWITCH VOUT 5 2.5V TO 5V 0.35 CPL (OPTIONAL) R1 CURRENT SENSE
- - +
FB 3 1.00V REF R2 COUT
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KB3436
LOW NOISE FIXED FREQUENCY OPERATION Oscillator The frequency of operation is internally set to 650kHz. Error Amp The error amplifier is an internally compensated transconductance type (current output) with a transconductance (gm) = 33 microsiemens. The internal 1.00V reference voltage is compared to the voltage at the FB pin to generate an error signal at the output of the error amplifier. A voltage divider from VOUT to ground programs the output voltage via FB from 2.5V to 5V using the equation: VOUT = 1.00V * [1 + (R1/R2)] Current Sensing Lossless current sensing converts the NMOS switch current signal to a voltage to be summed with the internal slope compensation. The summed signal is compared to the error amplifier output to provide a peak current control command for the PWM. Peak switch current is limited to approximately 600mA independent of input or output voltage. The switch current signal is blanked for 60ns to enhance noise rejection. Zero Current Comparator The zero current comparator monitors the inductor current to the output and shuts off the synchronous rectifier once this current reduces to approximately 27mA. This prevents the inductor current from reversing in polarity thereby improving efficiency at light loads. Antiringing Control The antiringing control circuitry prevents high frequency ringing of the SW pin as the inductor current goes to zero in discontinuous mode. The damping of the resonant circuit formed by L and CSW (capacitance on SW pin) is achieved by placing a 150 resistor across the inductor. Synchronous Rectifier To prevent the inductor current from running away, the PMOS synchronous rectifier is only enabled when VOUT > (VIN + 0.1V) and the FB pin is >0.8V.
OPERATION
The KB3436 are 650kHz, synchronous boost converters housed in a 6-lead SOT-23 package. Able to operate from an input voltage below 1V, the device features fixed frequency, current mode PWM control for exceptional line and load regulation. Low RDS(ON) internal MOSFET switches enable the device to maintain high efficiency over a wide range of load current. Detailed descriptions of the different operating modes follow. Operation can be best understood by referring to the Block Diagram. LOW VOLTAGE START-UP The KB3436 include an independent start-up oscillator designed to start up at input voltages of 0.8V typically. The frequency and duty cycle of the start-up oscillator are internally set to 150kHz and 67% respectively. In this mode, the IC operates completely open-loop and the current limit is also set internally to 600mA. Once the output voltage exceeds 2.3V, the start-up circuitry is disabled and normal close-loop PWM operation is initiated. In normal mode, the KB3436 power themselves from VOUT instead of VIN. This allows the battery voltage to drop to as low as 0.5V without affecting the circuit operation. The only limiting factor in the application becomes the ability of the battery to supply sufficient energy to the output. Soft-start and inrush current limiting are provided during start-up as well as normal mode operation. Soft-Start The KB3436 provide soft-start by charging an internal capacitor with a very weak current source. The voltage on this capacitor, in turn, slowly ramps the peak inductor current from zero to a maximum value of 850mA. The soft-start time is typically 2.5ms, the time it takes to charge the capacitor from zero to 1.20V. However, this time varies greatly with load current, output voltage and input voltage (see Typical Performance Characteristics, Inrush Current Control and Soft-Start). The soft-start capacitor is discharged completely in the event of a commanded shutdown or a thermal shutdown. It is discharged only partially in case of a short circuit at the output.
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KB3436
Diagram). However, this may adversely affect the efficiency and the quiescent current requirement at light loads. Typical values of CPL range from 15pF to 220pF. OUTPUT DISCONNECT AND INRUSH LIMITING The KB3436 are designed to allow true output disconnect by eliminating body diode conduction of the internal PMOS rectifier. This allows VOUT to go to zero volts during shutdown, drawing zero current from the input source. It also allows for inrush current limiting at start-up, minimizing surge currents seen by the input supply. Note that to obtain the advantage of output disconnect, there must not be an external Schottky diode connected between the SWITCH pin and VOUT. Board layout is extremely critical to minimize voltage overshoot on the SWITCH pin due to stray inductance. Keep the output filter capacitor as close as possible to the VOUT pin and use very low ESR/ESL ceramic capacitors tied to a good ground plane. For applications with VOUT over 4.3V, a Schottky diode is required to limit the peak SWITCH voltage to less than 6V unless some form of external snubbing is employed. This diode must also be placed very close to the pins to minimize stray inductance. See the Applications Information. SHORT CIRCUIT PROTECTION Unlike most boost converters, the KB3436 allow their output to be short circuited due to the output disconnect feature. The devices incorporate internal features such as current limit foldback, thermal regulation and thermal shutdown for protection from an excessive overload or short circuit. In the event of a short circuit, the internal soft-start capacitor gets partially discharged. This, in turn, causes the maximum current limit to foldback to a smaller value. In addition to this, a thermal regulation circuit starts to dial back the current limit farther if the die temperature rises above 125C. If the die temperature still reaches 160C, the device shuts off entirely. VIN > VOUT OPERATION The KB3436 will maintain voltage regulation even if the input voltage is above the output voltage. This
OPERATION
Thermal Shutdown An internal temperature monitor will start to reduce the peak current limit if the die temperature exceeds 125C. If the die temperature continues to rise and reaches 160C, the part will go into thermal shutdown, all switches will be turned off and the soft-start capacitor will be reset. The part will be enabled again when the die temperature drops by about 15C. Burst Mode OPERATION Portable devices frequently spend extended time in low power or standby mode, only switching to high power consumption when specific functions are enabled. To improve battery life in these types of products, it is important to maintain a high power conversion efficiency over a wide output power range. The KB3436 provides automatic Burst Mode operation to increase efficiency of the power converter at light loads. Burst Mode operation is initiated if the output load current falls below an internally programmed threshold. This threshold has an inverse dependence on the duty cycle of the converter and also the value of the external inductor (See Typical Performance Characteristics, Output Current Burst Mode Threshold vs VIN). Once Burst Mode operation is initiated, only the circuitry required to monitor the output is kept alive and the rest of the device is turned off. This is referred to as the sleep state in which the IC consumes only 20A from the output capacitor. When the output voltage droops by about 1% from its nominal value, the part wakes up and commences normal PWM operation. The output capacitor recharges and causes the part to re-enter the sleep state if the output load remains less than the Burst Mode threshold. The frequency of this intermittent PWM or burst operation depends on the load current; that is, as the load current drops further below the burst threshold, the KB3436 turns on less frequently. When the load current increases above the burst threshold, the KB3436 seamlessly resumes continuous PWM operation. Thus, Burst Mode operation maximizes the efficiency at very light loads by minimizing switching and quiescent losses. However, the output ripple typically increases to about 2% peak-to-peak. Burst Mode ripple can be reduced, in some circumstances, by placing a small phase-lead capacitor (CPL) between VOUT and FB pins (refer to the Block
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KB3436
mode, there will be more power dissipation within the IC. This will cause a sharp drop in the efficiency (see Typical Performance Characteristics, Efficiency vs VIN). The maximum output current should be limited in order to maintain an acceptable junction temperature.
OPERATION
is achieved by terminating the switching of the synchronous PMOS and applying VIN statically on its gate. This ensures that the slope of the inductor current will reverse during the time current is flowing to the output. Since the PMOS no longer acts as a low impedance switch in this
APPLICATIONS INFORMATION
PCB LAYOUT GUIDELINES The high speed operation of the KB3436 demands careful attention to board layout. You will not get advertised performance with careless layout. Figure 2 shows the recommended component placement. A large ground pin copper area will help to lower the chip temperature. A multilayer board with a separate ground plane is ideal, but not absolutely necessary. inductor ripple current. Increasing the inductance above 10H will increase size while providing little improvement in output current capability. The approximate output current capability of the KB3436 versus inductance value is given in the equation below and illustrated graphically in Figure 3. IOUT(MAX) = where:
KB3436 SW VIN 6
* IP -
VIN * D * (1 - D) f *L * 2
VIN
1 2 3
GND VOUT 5 FB SHDN 4 SHDN
VOUT
= estimated efficiency IP = peak current limit value (0.6A) VIN = input (battery) voltage D = steady-state duty ratio = (VOUT - VIN)/VOUT f = switching frequency (650kHz typical) L = inductance value
200
RECOMMENDED COMPONENT PLACEMENT. TRACES CARRYING HIGH CURRENT ARE DIRECT. TRACE AREA AT FB PIN IS SMALL. LEAD LENGTH TO BATTERY IS SHORT OUTPUT CURRENT (mA)
VIN = 1.2V
180 160 140 120 100 80 60 40 20 0 2.2 5 7 9 11 13 15 17 19 21 23 INDUCTANCE (H) VOUT = 5V VOUT = 3.3V
Figure 2. Recommended Component Placement for Single Layer Board
COMPONENT SELECTION Inductor Selection The KB3436 can utilize small surface mount and chip inductors due to its fast 650kHz switching frequency. Typically, a 4.7H inductor is recommended for most applications. Larger values of inductance will allow greater output current capability by reducing the
Figure 3. Maximum Output Current vs Inductance Based on 90% Efficiency
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Output and Input Capacitor Selection Low ESR (equivalent series resistance) capacitors should be used to minimize the output voltage ripple. Multilayer ceramic capacitors are an excellent choice as they have extremely low ESR and are available in small footprints. A 4.7F to 15F output capacitor is sufficient for most applications. Larger values up to 22F may be used to obtain extremely low output voltage ripple and improve transient response. An additional phase lead capacitor may be required with output capacitors larger than 10F to maintain acceptable phase margin. X5R and X7R dielectric materials are preferred for their ability to maintain capacitance over wide voltage and temperature ranges. Low ESR input capacitors reduce input switching noise and reduce the peak current drawn from the battery. It follows that ceramic capacitors are also a good choice for input decoupling and should be located as close as possible to the device. A 10F input capacitor is sufficient for virtually any application. Larger values may be used without limitations. Table 2 shows a list of several ceramic capacitor manufacturers. Consult the manufacturers directly for detailed information on their entire selection of ceramic capacitors.
Table 2. Capacitor Vendor Information
SUPPLIER WEBSITE www.avxcorp.com www.murata.com www.t-yuden.com AVX Murata Taiyo Yuden
APPLICATIONS INFORMATION
The inductor current ripple is typically set for 20% to 40% of the maximum inductor current (IP). High frequency ferrite core inductor materials reduce frequency dependent power losses compared to cheaper powdered iron types, improving efficiency. The inductor should have low ESR (series resistance of the windings) to reduce the I2R power losses, and must be able to handle the peak inductor current without saturating. Molded chokes and some chip inductors usually do not have enough core to support the peak inductor currents of 850mA seen on the KB3436. To minimize radiated noise, use a toroid, pot core or shielded bobbin inductor. See Table 1 for some suggested components and suppliers.
Table 1. Recommended Inductors
L (H) 4.1 10 4.7 4.7 10 4.7 3.3 4.7 10 4.7 4.7 10 4.7 MAX DCR m 57 124 105 170 109 182 216 174 60 75 90 84 137 195 HEIGHT (mm) 2.0 2.0 1.8 1.8 3.5 3.5 0.8 0.8 2.9 2.9 2.9 2.0 2.0 2.2
PART CDRH5D18-4R1 CDRH5D18-100 CDRH3D16-4R7 CDRH3D16-6R8 CR43-4R7 CR43-100 CMD4D06-4R7MC CMD4D06-3R3MC DS1608-472 DS1608-103 DO1608C-472 D52LC-4R7M D52LC-100M LQH32CN4R7M24
VENDOR Sumida www.sumida.com
Coilcraft www.coilcraft.com Toko www.tokoam.com Murata www.murata.com
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TYPICAL APPLICATION
Application Circuit for VOUT > 4.3V Where Inrush Current Limiting and Output Disconnect are Not Required
L1 4.7H VIN D1*
2-Cell to 5V Efficiency
100 100 VIN = 3V EFFICIENCY VIN = 2.4V VIN = 2.4V VIN = 3V 60 POWER LOSS 50 40 0.1 0.001 0.0001 1000 0.01 10
POWER LOSS (W)
+
2 AA CELL
C1 4.7F
1 6 SW VIN VOUT 5 R1 980K R2 245k VOUT 5V 150mA C2 4.7F
90
EFFICIENCY (%)
KB3436 OFF ON 4 SHDN GND 2 FB 3
80 70
1 0.1
1 10 100 OUTPUT CURRENT (mA)
Single AA Cell to 2.5V Synchronous Boost Converter
L1 4.7H
Single AA Cell to 3.3V Synchronous Boost Converter
L1 4.7H
+
SINGLE AA CELL
C1 4.7F
1 6 SW VIN VOUT 5 R1 450K R2 250K VOUT 2.8V 120mA C2 4.7F
SINGLE AA CELL
+
C1 4.7F
1 6 SW VIN VOUT 5 R1 460K R2 200K VOUT 3.3V 100mA C2 4.7F
KB3436 OFF ON 4 SHDN GND 2 FB 3
KB3436 OFF ON 4 SHDN GND 2 FB 3
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PACAGE DESCRIPTION
Small Outline SOT23-6
b e
E
e1 D A A2 A1
C E1 r L
SYMBOL A A1 A2 b C D E E1 L e e1 r
MIN 0.035 0.000 0.035 0.010 0.003 0.110 0.102 0.059 0.014 00
INCHES
0.037ref 0.075ref
MAX 0.057 0.006 0.051 0.020 0.008 0.122 0.118 0.069 0.022 100
MILLIMETERS MIN MAX 0.90 1.45 0.00 0.15 0.90 1.30 0.25 0.50 0.08 0.20 2.80 3.10 2.60 3.00 1.50 1.75 0.35 0.55 0.95ref 1.90ref 00 100
NOTES -
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