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PRELIMINARY
ML4435 Sensorless BLDC Motor Controller
GENERAL DESCRIPTION
The ML4435 provides all the circuitry for sensorless speed control of 3 phase Brushless DC Motors. Controller functions include start-up circuitry, Back EMF commutation control, Pulse Width Modulation (PWM) speed control, pulse-by-pulse current limiting, motor coasting, and under-voltage protection. Motor starting is accomplished by commutating the motor at a low frequency to produce low speed motion. The low speed motion is used to generate a Back EMF signal. A back EMF sampling circuit locks on to the motors position and controls commutation timing by forming a phase locked loop (PLL). The commutation control circuitry also outputs a speed feedback signal used in the speed control loop. The speed control loop consists of an error amplifier and PWM comparator that produces a PWM duty cycle for speed regulation. Motor current is limited by a pulseby-pulse PWM shutdown comparator that is tripped by the voltage across an external current sense resistor. Commutation control, PWM speed control, and current limiting are combined to produce the output driver signals. Six output drivers are used to provide gating signals to an external 3 phase bridge power stage sized for the Brushless DC (BLDC) motor voltage and current requirements. Additional functions include a motor coast function and an under voltage lock out circuit to shut down the output drivers in the event of a low voltage condition on the VCC to the ML4435.
FEATURES
n Proprietary back-EMF sensing commutation technique for motor communication without hall effect sensors n PWM pulse-by-pulse current limiting to protect motor and FET drivers n Stand-alone operation; motor starts and stops with power applied to the IC* n Soft-start function limits start-up current n PWM speed control for efficiency and minimum FET sizing n Onboard under voltage lock out and power fail detect n Tach output senses commutation of the motor
* Some External Components Required.
PRELIMINARY DATASHEET
May, 2000
PRELIMINARY
ML4435
WARRANTY
Micro Linear makes no representations or warranties with respect to the accuracy, utility, or completeness of the contents of this publication and reserves the right to make changes to specifications and product descriptions at any time without notice. No license, express or implied, by estoppel or otherwise, to any patents or other intellectual property rights is granted by this document. The circuits contained in this document are offered as possible applications only. Particular uses or applications may invalidate some of the specifications and/or product descriptions contained herein. The customer is urged to perform its own engineering review before deciding on a particular application. Micro Linear assumes no liability whatsoever, and disclaims any express or implied warranty, relating to sale and/or use of Micro Linear products including liability or warranties relating to merchantability, fi tness for a particular purpose, or infringement of any intellectual property right. Micro Linear products are not designed for use in medical, life saving, or life sustaining applications.
(c) Micro Linear 2000. is a registered trademark of Micro Linear Corporation. All other trademarks are the property of their respective owners. Products described herein may be covered by one or more of the following U.S. patents: 4,897,611; 4,964,026; 5,027,116; 5,281,862; 5,283,483; 5,418,502; 5,508,570; 5,510,727; 5,523,940; 5,546,017; 5,559,470; 5,565,761; 5,592,128; 5,594,376; 5,652,479; 5,661,427; 5,663,874; 5,672,959; 5,689,167; 5,714,897; 5,717,798; 5,742,151; 5,747,977; 5,754,012; 5,757,174; 5,767,653; 5,777,514; 5,793,168; 5,798,635; 5,804,950; 5,808,455; 5,811,999; 5,818,207; 5,818,669; 5,825,165; 5,825,223; 5,838,723; 5.844,378; 5,844,941. Japan: 2,598,946; 2,619,299; 2,704,176; 2,821,714. Other patents are pending.
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PRELIMINARY DATASHEET
May, 2000
PRELIMINARY
BLOCK DIAGRAM
ML4435
FB A 14 FB B 15 MUX 2.9k FB C 16 COMMUTATION STATE MACHINE
R
NEUTRAL SIMULATOR 5.8k
18 SPEED FB SIGN CHANGER
+ - + +
LEVEL SHIFT - 0.7V
COMP
0.97V
-
2 TACH
BACK EMF SAMPLER SPEED FB 6 VOLTAGE CONTROLLED OSCILLATOR
+
B
20 CVCO 4 RVCO
COMP
3s POWER ON RESET PULSE
A F
1.5V SPEED ERROR AMP
+ - + -
-
COAST
0.9V
E D
C
SPEED SET 5 8.2 + 0.7V
7 HA GATING LOGIC AND OUTPUT DRIVERS 8 HB 9 HC 11 LA 12 LB 13 LC D Q PULSE-BY-PULSE CURRENT LIMIT R 8.7V
LEVEL SHIFT 0.7V
+ -
SPEED COMP 3 5V
PWM COMPARATOR
2.2 + 0.7V
TRIANGLE WAVE GENERATOR
ISENSE 1
+ -
1V
+
UVLO COMPARATOR
225k SOFT START 19 225k
COMP
-
6V REFERENCE VREF + 0.7V
VREF
CURRENT LIMIT COMPARATOR
6 RT
10 VCC
17 GND
ML4435 Block Diagram
May, 2000
PRELIMINARY DATASHEET
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PRELIMINARY
PIN CONFIGURATION
ML4435 20-P n PDIP P20 20-P n SOIC S20
ISENSE TACH SPEED COMP RVCO SPEED SET RT HA HB HC VCC 9 0 2 3 4 5 6 6 5 4 3 2 20 9 CVCO SOFT START SPEED FB ND FB C FB B FB A LC LB LA
ML4435
TOP VIEW
PIN DESCRIPTIONS
PIN NAME FUNCTION
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
ISENSE TACH SPEED COMP RVCO SPEED SET RT HA HB HC VCC LA LB LB FB A FB B FB C GND SPEED FB SOFT START CVCO
Motor current sense input which triggers pulse by pulse current limit when ISENSE exceeds 0.55V A clock output of 6 pulses per commutation cycle when SPEED FB is greater than 0.97V otherwise the TACH output is at 5V Connection node for speed loop compensation components Connection node for external resistor to set VCO frequency DC input for setting motor speed External resistor from this pin to ground controls the IC's PWM timing (frequency) High-side output driver for motor phase A High-side output driver for motor phase B High-side output driver for motor phase C Power Supply input Low-side output driver signal for motor phase A Low-side output driver signal for motor phase B Low-side output driver signal for motor phase C Back EMF signal input for motor phase A Back EMF signal input for motor phase B Back EMF signal input for motor phase C Signal and power ground Connection node for back-EMF sensing compensation components Connection node for external soft start capacitor which reduces start up current Connection node for external capacitor to set VCO frequency. Forcing this input below 1.5V causes the commutation to stop and the motor to coast
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PRELIMINARY DATASHEET
May, 2000
PRELIMINARY
FUNCTIONAL DESCRIPTION
COMPONENT SELECTION Selecting external components for the ML4435 requires calculations based on the motor's electrical and mechanical parameters. The following is a list of the motor parameters needed to for these calculations: The maximum DC motor supply voltage V MOTOR (V) The maximum operating current I MAX (A) The winding resistance measured line to line Rl-l The number of magnetic poles N (Unitless) The Back EMF constant Ke (V s/RAD) The torque constant K (N m/A) of the motor (K = Ke in SI units) The maximum speed of operation RPMMAX (RPM) The moment of inertia J (Kg m2 ) of the motor and its load The viscous damping factor (Unitless) of the motor and its load If one or more of the above values is not known, it is still possible to pick components for the ML4435, but some experimentation may be necessary to determine the optimal values. All quantities are in SI units unless otherwise specified. The following formulas and component selection graphs should be considered as a starting point from which to optimize the application. All calculations for capacitors and resistors should be used as the first approximation for selecting the closest standard value. SUPPLY VOLTAGE AND ON-CHIP VOLTAGE REFERENCE VCC The supply voltage at VCC (pin 10) is nominally 12V 10%. A bypass capacitor of 0.1F to ground as close as possible to VCC (pin 10) is recommended.
6
ML4435
OUTPUT DRIVERS The output drivers LA, LB, LC, HA, HB, and HC provide totem pole output drive signals for a 3 phase bridge power stage. All control functions in the ML4435 translate to outputs at these pins. LA, LB, LC provide the low side drive signals for phases A, B, and C of the 3 phase power stage and are 12V active high signals. HA, HB, and HC provide the high side signals for phases A, B, and C of the 3 phase power stage and are 12V active low signals. CURRENT LIMITING IN THE 3 PHASE BRIDGE POWER STAGE A current sense resistor RSENSE shown in Figure 1 is installed in the 3 phase power stage to regulate the maximum current in the power stage and the BLDC motor. Current regulation is accomplished by shutting off the output drivers LA, LB, and LC for the remainder of the PWM period if the voltage across RSENSE exceeds the current limit threshold set by the SOFT START (pin 19). The maximum power dissipated in RSENSE is shown in Figure 2.
R
ISENSE
RSENSE
C
Figure 1. Current Limit with RSENSE
RT
5
An internal 6V reference is generated inside the ML4435. The reference appears on RT (pin 6). A resistor to ground on RT sets the PWM frequency. This resistor can be replace with a potentiomenter for use in setting the speed command. This topic is discussed under the PWM SPEED CONTROL section. Note: Buffer this pin with an op amp with at least a 1M input impedance if external circuits are necessary.
RSENSE Po er Rat n W
4
3
2
0 0 2 4 6 0
IMAX [MOTOR] A
Figure 2. RSENSE Power vs. Motor Current
May, 2000
PRELIMINARY DATASHEET
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PRELIMINARY
FUNCTIONAL DESCRIPTION
SOFT START The voltage at SOFT START (pin 19) sets the current limit threshold. The ML4435 has an internal voltage divider with a 1.1V supply voltage. This circuit is shown in Figure 3. The divider consists of two 225k resistors setting the current limit threshold to approximately 0.55V. An external voltage divider off of VCC or an external reference can be used to override the default setting of SOFT START by using a divider with 10 times the current draw of the internal divider. RSENSE
ML4435
The function of RSENSE is to provide a voltage proportional to the motor current, for current limiting. The default trip voltage across RSENSE is 0.6V as set by the SOFT START (pin 19). The current sense resistor should be a low inductance resistor such as a carbon composition. For resistors in the milli ohms range wire wound resistors tend to have low values of inductance. RSENSE can be selected using Figure 4. The power rating of RSENSE should be sized to handle the power dissipation (I MAX squared times RSENSE) seen at maximum current. ISENSE FILTER
.V 225k
SOFT START 9 CSOFT START
0.5V 225k
An RC lowpass filter is required at the ISENSE input pin to remove the voltage spike on the leading edge of the current sense signal caused by the diode reverse recovery shoot through current. Absent the filter, false triggering of the current limit could occur. The recommended starting values for this circuit are R = 1K and C = 1000pF a configuration that will filter out spikes less than 1s long. It is recommended that the capacitor value not be increased beyond 330pF. Pulse-By-Pulse Current Limiting
Figure 3. SOFT START Function
A capacitor to ground on the SOFT START pin can be used to provide a soft ramping of the current limit on power up. The ramp time can be selected using Figure 4.
When current limit is activated by the voltage on ISENSE exceeding the voltage on SOFT START the current limit is tripped, turning off LA, LB, and LC for the remainder of the PWM period. COMMUTATION CONTROL A 3 phase Brushless DC motor requires electronic com-
30 RAMP TIME s
5
BEFORE FILTERIN
0
0
50 C SOFT START
00 F
AFTER FILTERIN
Figure 4. SOFT START Ramp Time vs. CSOFTSTART
Figure 5. ISENSE Filter Wave Forms
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PRELIMINARY DATASHEET
May, 2000
PRELIMINARY
FUNCTIONAL DESCRIPTION
mutation to achieve rotational motion. Electronic commutation requires the switching on and off of the power switches of a 3 phase half bridge. For torque production to be achieved in one direction the commutation is dictated by the rotor's position. Electronic commutation in the ML4435 is achieved by turning on and off, in the proper sequence, one L output from one phase and one H output from another phase. There are six combinations of L and H outputs (six switching states) that constitute a full commutation cycle as illustrated in Table 1 labeled state A through F. This switching sequence is programmed into the commutation state machine as illustrated in Figure 6. Clocking of the commutation state machine is provided by the output of a VCO. VOLTAGE CONTROLLED OSCILLATOR The VCO outputs a TTL compatible clock on the TACH
OUTPUT DRIVERS
ML4435
(pin 2) proportional to the input voltage to the voltage controlled oscillator SPEED FB (pin 18). The proportion of frequency to voltage or VCO constant Kv is set by a resistor to ground on RVCO (pin 4) and capacitor to ground on CVCO (pin 20) as shown in Figure 7. RVCO sets up a current proportional to the VCO input voltage SPEED FB minus 0.7V. This current is used to charge and discharge CVCO between the threshold voltages of 2V and 3.75V as shown in Figure 7. RVCO has a lower voltage limit of 0.2V. The resulting triangle wave of CVCO corresponds to the clock on the TACH pin, this is also illustrated in Figure 7. Kv should be set so that the VCO output frequency corresponds to the maximum commutation frequency FMAX and thus the maximum motor speed when the VCO input is equal to or slightly less than 6V. CVCO and RVCO can be selected by first calculating FMAX and then using the selection graph in Figure 8. FMAX is calculated as follows: FMAX = 0.05 x RPMMAX x N Where: RPMMAX = The maximum speed of operation (RPM). N = The number of magnetic poles (Unitless). TACH The TACH (pin 2) outputs the VCO frequency. This is 6
LA A B STATE C D E F
LB
LC
HA
HB
HC
LOW LOW HI H LOW HI H HI H LOW LOW HI H HI H LOW HI H HI H LOW LOW HI H LOW HI H HI H LOW LOW HI H HI H LOW LOW HI H LOW HI H HI H LOW
SPEED FB
LOW HI H LOW LOW HI H HI H
LEVEL SHIFT 0. V + 3. 5V VOLTA E CONTROLLED OSCILLATOR 2V RVCO 4 CVCO 20
= DRIVER ON
Table 1. Communication Control States
COMMUTATION STATE MACHINE
R
0.9V
CLK VCO
3s POWER ON RESET PULSE
A F B
E D
C
Figure 6. Commutation State Machine
Figure 7. VCO Control
May, 2000
PRELIMINARY DATASHEET
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PRELIMINARY
FUNCTIONAL DESCRIPTION
times the commutation frequency. The TACH out also indicates a low motor speed by staying TTL high when the motor is at its minimum speed (SPEED FB below 0.97V). BACK EMF SAMPLER The input to the VCO (pin 18) SPEED FB is controlled by the Back EMF Sampler. The back EMF sense pins FB A, FB B, and FB C inputs to the back EMF sampler require a signal from the motor phase leads that is below the VCC of the ML4435. The phase sense input impedance is 8.7k. If the motor voltage is greater than the VCC of the ML4435 then this requires a series resistor RFB from the motor phase lead shown in Figure 8. RFB can be selected by using the graph in Figure 9 or using the following equation:
ML4435
The back EMF sampler takes the motor phase voltages divided down to signals that are less than VCC (12V nominal) and calculates the neutral point of the motor by the following equation:
VNEUTRAL = (FB A + FB B + FB C)/3 This allows the ML4435 to compare the back EMF signal to the motors neutral point without the need for bringing out an extra wire on a WYE wound motor. For DELTA wound motors there isn't a physical neutral to bring out so this reference point must be calculated anyway. The back EMF sampler takes the motor phase that is not driven (i.e. if LA and HB are on then phase A is driven low and phase B is driven high then phase C is sampled). The sampled phase provides a back EMF signal that is compared against the neutral of the motor. The sampler is controlled by the commutation state machine. The sampled back EMF is compared to the neutral through an error amplifier. The output of the error amplifier outputs a charging or discharging current to SPEED FB (pin 18) which provides the voltage to the VCO. BACK EMF SENSING PHASE LOCKED LOOP COMMUTATION CONTROL The three blocks: The commutation state machine, the VCO, and the back EMF sampler form a phase locked loop that locks the commutation clock onto the back EMF signal. The complete phase locked loop is illustrated in Figure 10. The phased locked loop requires a lead lag filter that is set by external components on SPEED FB (pin 18). The filter components in Figure 10 work for most applications. If performance is unstable C1 and C2 can go up or down a decade in value as low as the C2 stays equal to C1 x 10.
RFB = 8.7kW (
VMOTOR - 1) 12
BLDC MOTOR RFBA 4 FBA RFBB 5 FBB RFBC 6 FBC
A
B
C
Figure 8. Back EMF Sampler Configuration
2,000
FBA 4
0,000
FBB 5 FBC 6
BACK EMF SAMPLER
SPEED FB CSFB RSFB RSFB2
R B F A, B, C
,000
VCO
6,000
CSFB2
4,000
COMMUTATION STATE MACHINE
2,000
0 0 5 20 25 30
Motor Volta e [Max] V
Figure 9. RFB vs. VMOTOR [MAX]
Figure 10. Phase Locked Loop
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PRELIMINARY DATASHEET
May, 2000
PRELIMINARY
FUNCTIONAL DESCRIPTION
MOTOR START-UP When power is first applied to the ML4435, the motor is at rest and thus, the back EMF is equal to zero. The motor needs to be rotating for the Back EMF sampler to lock onto the rotor position and commutate the motor. The ML4435 uses a minimum VCO frequency to begin commutating the motor. This low frequency commutation is set by the 0.2V clamp on RVCO, this provides a commutation frequency at 1/30th of the maximum frequency. RUN MODE After the Back EMF sensing PLL has locked on to the motor's position, the motor is running in closed loop control. At this point, the speed control loop should force the motor speed to the speed that corresponds to the SPEED SET voltage. PWM SPEED CONTROL Speed control is accomplished by setting a speed command at SPEED SET (pin 5) with an input voltage from 0.2 to 6V. The accuracy of the speed command is determined by the external components RVCO and CVCO. There are a number of methods to control the speed command on the ML4435. One method is to use a potentiometer from RT to ground with the wiper going to SPEED SET. If SPEED SET is controlled from a microcontroller, a DAC that uses RT as its input reference can be used. The RT voltage must be buffered connecting it to external circuits. The speed command is compared with the sensed speed from SPEED FB minus 0.7V (pin 18) through a transconductance error amplifier. The output of the speed error amplifier is SPEED COMP (pin 3). SPEED COMP is clamped between 8.2V and 2.2V. A signal of 8.2V corresponds to full PWM duty cycle and 2.2V corresponds to 0% duty cycle. Speed loop compensation components are placed on this pin as shown in Figure 11. The speed loop compensation components are calculated as follows:
5
ML4435
The voltage on SPEED COMP (pin 3) is compared with a triangle wave oscillator to create a PWM duty cycle. The PWM oscillator creates a triangle wave function from 3V to 7V as shown in Figure 11. The frequency of the triangle wave oscillator is set by a resistor to ground on RT (pin 6). RT can be selected from the graph in Figure 12. The PWM duty cycle from the speed control loop is gated the pulse-by-pulse current limit that controls the LA, LB, and LC output drivers.
SPEED FB SPEED ERROR AMP
SPEED SET
- +
- +
LEVEL SHIFT 0. V .2 - 0. V SPEED COMP 3 CSE 2.2 + 0. V TRIAN LE WAVE COMPARATOR V 3V PWM COMPARATOR
+ -
Figure 11. PWM Oscillator Circuit
000
C SC 2 = Rsc =
144 x NxKexVMOTOR x R VCO x C VCO . 2 x x J x RI x freq 2
RT k
00
10 2 x x freq x Csc2
0 0 PWM FRE UENCY kHz 00
Csc1 = 10 x Csc2 Where freq is the speed loop bandwidth in Hz.
Figure 12. RT vs PWM Frequency
May, 2000
PRELIMINARY DATASHEET
9
PRELIMINARY
FUNCTIONAL DESCRIPTION
COAST When CVCO (pin 20) is pulled below 1.5V the output drivers LA, LB, LC and HA, HB, and HC are turned off. The COAST function shuts all power off from the motor allowing it to coast to a stop. The COAST function in (pin 20) is configured as shown in Figure 13 and can be driven by a switch to ground or open collector to ground also shown in Figure 13. UNDER VOLTAGE PROTECTION
ML4435
Undervoltage protection is used to protect the 3 phase bridge power stage from a low VCC condition. Undervoltage is triggered at VCC of 9.2V or under. Undervoltage also turns off all output drivers LA, LB, LC, HA, HB, and HC. The comparator that triggers undervoltage protection has 500mV of hystersis. INTERFACING THE OUTPUT DRIVERS TO THE 3 PHASE BRIDGE POWER STAGE The most flexible configuration is to use high side drivers to control N-Channel MOSFETs (or IGBTs) allowing applications from less than 12V up to 170V. Figure 14a shows the ML4435 and all the support circuitry in a typical application. Figure 14b shows a power stage using the IR2118 high side drivers from International Rectifier and high voltage MOSFETs.
P
3. 5V 2V
CVCO 20
+
COAST
.5V
-
COMP
Figure 13. Coast Control
N.C. N.C.
2 3 4 5 6
9 0 TP 0 ISENSE 2 3 4 R3 k 5 6 TP 3 TACH RUN SW N.C. N.C. N.C. N.C. R0 k N.C. N.C. 2V 9 20 2 22 23 24 25 26 IDC 26
SW4PDT TP 5 LIMIT C3 2200 F N.C.
COAST C5 0.33 F ML4435 ISENSE C4 0F R4 20k 2 3 R6 0k 4 5 6 TP SPEED SET TACH S COMP RVCO S SET RT HA HB R k R2 00k 9 0 R 90.9k HC VCC CVCO I LIMIT S FB ND FB C FB B FB A LC LB LA 6 5 4 3 2 R R9 R2 k k k C .033 F C . F 0k C9 .0 F 200k R5 R6 20 9 C0 00 F TP 2 S FB
2V C2 0. F
C 4 F
Figure 14a. ML4435 Typical Application
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PRELIMINARY DATASHEET
May, 2000
P2 PHASE A TERMINAL PHASE B PHASE C
ND
HV SA SB SC F R32 IRF644 C0 390 F 200V C3 0.33 F 250V 2 IRF644 6 IRF644 R3 R3 .0k .0k R43 0.33 F 250V C4 .5k .5k 3 IRF644 R3 5 IRF644 SA FUSE TERMINAL TERMINAL
2
2PIN
P R44 .5k
2
HA
3 .0k
SA 4
LA
5
ND
6
HB ISENSE R50 0 R49 0.4 W
4 IRF644
SB
FUNCTIONAL DESCRIPTION
LB
9
ND ND ND 2V C2 UNUSED D UF4005 R30 R35 0k C3 F 2 6 5 3 4 IR2 6 5 0k U C HA 2 3 4 IR2 F F C2 D2 UF4005 ND 0k U2 C4 F
0
HC
SC
2
R42 0k R36 R4 0k U3 C5 F 2 3 4 IR2 6 5 C6 F D3 UF4005
PRELIMINARY
May, 2000
HB HC LC LB LA 2N440 C F 2N4403 ND C F 0 2N4403 9 2N440
LC
3
ND
4
ISENSE
5
R4 0k
ND
6
2V
Figure 14b. Power Stage
ND
ND
9
20
ND
2
22
ND
23
24
ND
25
26
PRELIMINARY DATASHEET
IDC 26
2N440 C9 F 2 2N4403
ML4435
11
PRELIMINARY
ELECTRICAL TABLES
Unless otherwise specified, Ta= Operating Temperature Range, VCC= 12V +/- 10%, RT= 50k SYMBOL PARAMETER CONDITIONS REFERENCE RT VCO RVCO CVCO Lower Range2 Upper Lower Range2 Threshold2 0.2 6 2 3.75 1.5 2.875 0 V Speed Feedback TACH Out = Hi V Speed Feedback = 3.3V FB A, FB B, and FB C ISINK = 100A ISOURCE =100A 4.3 0 V SPEED COMP = 5.1V I = 45A I = 45A N1, N2, N3 N1, N2, N3 17 0 0.48 0.58 0.58 ISINK = 20mA ISOURCE = 20mA 0 0 8.7 8.2 0.5 0.5 9.2 8.7 15 +/-45 2.15 8.2 25 0 0.2 4.8 0.9 0.97 +/-80 Threshold2 MIN 5.8 TYP 6
ML4435
MAX 6.2
UNITS V V V V V V V
Upper Threshold2 Coast Enable Threshold2 Back EMF Blanking SPEED FEEDBACK Output Range2 V Minimum Frequency2 TACH Out Disabled Threshold2 I Back EMF Sampler2 BACK EMF SENSING Feed Back Input Range2 TACH TACH Out Low TACH Out High SPEED ERROR AMP SPEED SET Range2 I SPEED COMP SPEED COMP Output Lower Clamp2 SPEED COMP Output Upper Clamp2 OSCILLATOR PWM Frequency Duty CURRENT SENSE Cycle2
6.7
V V V A
VCC 0.4
V V V
6
V A V V
33 100 0.68
kHz % V V
V SOFT START ISENSE OUTPUTS (N1, N2, N3, P1, P2, AND P3) Output Low Output High (VCC-VOUT) UNDER-VOLTAGE LOCKOUT Start Threshold Under Voltage Threshold SUPPLY ICC
Note 1: Note 2
Threshold2
1 1 9.7 9.2
V V V V mA
Supply Current
Limits are guaranteed by 100% testing, sampling, or correlation with worst case test conditions
Guaranteed by design, not tested
12
PRELIMINARY DATASHEET
May, 2000
PRELIMINARY
PHYSICAL DIMENSIONS (inches/millimeters)
ML4435
Packa e P20 20-P n PDIP
.0 0 - .035 25.65 - 26.29 20
PIN
ID
0.240 - 0.260 0.295 - 0.325 6.09 - 6.6 .49 - .26
0.060 MIN .52 MIN 4 PLACES
0.055 - 0.065 .40 - .65
0. 00 BSC 2.54 BSC 0.0 5 MIN 0.3 MIN
0. 0 MAX 4.32 MAX
0. 25 MIN 3. MIN
0.0 6 - 0.022 0.40 - 0.56
SEATIN PLANE
0 - 5
0.00 - 0.0 2 0.20 - 0.3
Packa e S20 20-P n SOIC
0.49 - 0.5 2 2.65 - 3.00 20
0.29 - 0.30 .39 - .65 PIN ID
0.39 - 0.4 2 0. - 0.4
0.024 - 0.034 0.6 - 0. 6 4 PLACES
0.050 BSC .2 BSC
0.095 - 0. 0 2.4 - 2. 2 0 -
0.090 - 0.094 2.2 - 2.39
0.0 2 - 0.020 0.30 - 0.5
SEATIN PLANE
0.005 - 0.0 3 0. 3 - 0.33
0.022 - 0.042 0.56 - .0
0.00 - 0.0 5 0. - 0.3
May, 2000
PRELIMINARY DATASHEET
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PRELIMINARY
ORDERING INFORMATION
ML4435
PART NUMBER ML4435CP ML4435CS ML4435IP ML4435IS
TEMPERATURE RANGE 0C to 70C 0C to 70C -40C to 85C -40C to 85C
PACKAGE 20 Pin PDIP (P20) 20 Pin SOIC (S20) 20 Pin PDIP (P20) 20 Pin SOIC (S20)
Micro Linear Corporation 2092 Concourse Drive San Jose, CA 95131 Tel: (408) 433-5200 Fax: (408) 432-0295 www.microlinear.com
DS4435-01
14
PRELIMINARY DATASHEET
May, 2000

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