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MIC4575
Micrel
MIC4575
200kHz Simple 1A Buck Voltage Regulator
General Description
The MIC4575 is a series of easy to use fixed and adjustable BiCMOS step-down (buck) switch-mode voltage regulators. The 200kHz MIC4575 duplicates the pinout and function of the 52kHz LM2575. The higher switching frequency may allow up to a 2:1 reduction in output filter inductor size. The MIC4575 is available in 3.3V, and 5V fixed output versions or a 1.23V to 20V adjustable output version. Both versions are capable of driving a 1A load with excellent line and load regulation. The feedback voltage is guaranteed to 2% tolerance for adjustable versions, and the output voltage is guaranteed to 3% for fixed versions, within specified voltages and load conditions. The oscillator frequency is guaranteed to 10%. In shutdown mode, the regulator draws less than 200A standby current. The regulator performs cycle-by-cycle current limiting and thermal shutdown for protection under fault conditions. This series of simple switch-mode regulators requires a minimum number of external components and can operate using a standard series of inductors. Frequency compensation is provided internally. The MIC4575 is available in TO-220 (T) and TO-263 (U) packages for the industrial temperature range.
Features
* Fixed 200kHz operation * 3.3V, 5V, and adjustable output versions * Voltage over specified line and load conditions: Fixed version: 3% max. output voltage Adjustable version: 2% max. feedback voltage * Guaranteed 1A switch current * Wide 4V to 24V input voltage range * Wide 1.23V to 20V output voltage range * Requires minimum external components * < 200A typical shutdown mode * 75% efficiency (adjustable version > 75% typical) * Standard inductors and capacitors are 25% of typical LM2575 values. * Thermal shutdown * Overcurrent protection * 100% electrical thermal limit burn-in
Applications
* * * * * * * Simple high-efficiency step-down (buck) regulator Efficient preregulator for linear regulators On-card switching regulators Positive-to-negative converter (inverting buck-boost) Battery Charger Negative boost converter Step-down 6V to 3.3V for Intel PentiumTM and similar microprocessors
Typical Applications
L1
Shutdown Enable 5
SHDN
SW
2
5.0V/1A
68H
4
8V to 24V C1 150F 35V
1
MIC4575-5.0BT FB VIN GND
3
D1 1N5819
C2 330F 16V
Fixed Regulator
L1 68H
4
Shutdown Enable
5
SHDN VIN GND
3
SW FB
2
3.6V/1A R2 2.37k 1% R1 1.24k 1% C3 3300pF
6V to 24V C1 22F 35V
1
MIC4575BU
D1
C2 330F 6.3V
MBRS130LT3
Adjustable Regulator 4-106 April 1998*
MIC4575
Micrel
Ordering Information
Part Number MIC4575-3.3BT MIC4575-5.0BT MIC4575BT MIC4575-3.3BU MIC4575-5.0BU MIC4575BU Voltage 3.3V 5.0V Adjustable 3.3V 5.0V Adjustable Temperature Range -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C Package 5-lead TO-220 5-lead TO-220 5-lead TO-220 5-lead TO-263 5-lead TO-263 5-lead TO-263
Pin Configuration
5 4 3 2 1 SHDN FB GND SW VIN
TAB
5-Lead TO-220 (T)
4
SHDN FB GND SW VIN
5 4 3 2 1
TAB
5-Lead TO-263 (U)
Pin Description
Pin Number 1 2 3, TAB 4 Pin Name VIN SW GND FB Pin Function Supply Voltage (Input): Unregulated +4V to +40V supply voltage. Switch (Output): Emitter of NPN output switch. Connect to external storage inductor and Shottky diode. Ground Feedback (Input): Output voltage feedback to regulator. Connect to output of supply for fixed versions. Connect to 1.23V tap of resistive divider for adjustable versions. Shutdown (Input): Logic low enables regulator. Logic high (> 2.4V) shuts down regulator.
5
SHDN
April 1998*
4-107
MIC4575
Micrel
Absolute Maximum Ratings
Supply Voltage (VIN) Note 1 ....................................... +40V Shutdown Voltage (VSHDN) .......................... -0.3V to +36V Output Switch (VSW) steady state ................................. -1V Storage Temperature (TS) ......................... -65C to 150C
Operating Ratings
Supply Voltage (VIN) ................................................... +24V Junction Temperature ............................................. +150C Package Thermal Resistance TO-220, TO-263 (JA) ......................................... 65C/W TO-220, TO-263 (JA) ........................................... 2C/W
Electrical Characteristics
VIN = 12V; ILOAD = 200mA; TJ = 25C, bold values indicate -40C TJ +85C; unless noted. Parameter MIC4575 [Adjustable] Feedback Voltage Feedback Voltage Efficiency Feedback Bias Current MIC4575-3.3 Output Voltage Output Voltage Efficiency MIC4575-5.0 Output Voltage Output Voltage Efficiency MIC4575 / -3.3 / -5.0 Oscillator Frequency Saturation Voltage Maximum Duty Cycle (On) Current Limit Output Leakage Current IOUT = 1A FB connected to 0V Peak Current, tON 3s VIN = 24V, FB connected to 0V Output = 0V Output = -1V 90 1.7 1.3 180 200 1 95 2.2 3.0 3.2 2 30 10 200 220 1.3 1.5 kHz V V % A A mA mA mA A V V 1.0 0.8 30 10 V V A A 8V VIN 24V, 0.2A ILOAD 1A ILOAD = 1A 4.900 4.800 4.750 5.0 5.0 77 5.100 5.200 5.250 V V V % 6V VIN 24V, 0.2A ILOAD 1A ILOAD = 1A 3.234 3.168 3.135 3.3 3.3 72 3.366 3.432 3.465 V V V % 8V VIN 24V, 0.2A ILOAD 1A ILOAD = 1A, VOUT = 5V 1.217 1.193 1.180 1.230 1.230 77 50 100 500 1.243 1.267 1.280 V V V % nA nA Condition Min Typ Max Units
0 7.5 5
Quiescent Current Standby Quiescent Current SHDN Input Logic Level SHDN = 5V (regulator off) VOUT = 0V (regulator off) VOUT = 3.3 or 5V (regulator on) SHDN Input Current SHDN = 5V (regulator off) SHDN = 0V (regulator on) 2.2 2.4
50 1.4 1.2 4 0.01
-10
General Note: Devices are ESD protected, however, handling precautions are recommended. Note 1: The MIC4575 is not guaranteed to survive a short circuit to ground for input voltage above 24V.
4-108
April 1998*
MIC4575
Micrel
Block Diagrams
+24V max.
VIN
Shutdown Enable
CIN
SHDN
Internal Regulator 200kHz Oscillator Thermal Shutdown Current Limit
Comparator
Driver 1A Switch 1.23V Bandgap R1 R2 GND
SW D1
L1 VOUT COUT
Error Amp. MIC4575-x.x
FB
4
Block Diagram with External Components Fixed Step-Down Regulator
+24V max.
VIN
Shutdown Enable
CIN
SHDN
Internal Regulator 200kHz Oscillator Thermal Shutdown Current Limit VOUT V REF
R1 +1 R2 1
R1 Comparator Driver 1A Switch 1.23V Bandgap
R2
VOUT VREF
SW D1
L1 VOUT COUT
Error Amp. MIC4575 [Adjustable]
R1 FB GND R2
Block Diagram with External Components Adjustable Step-Down Regulator
April 1998*
4-109
MIC4575
Micrel
Functional Description
The MIC4575 is a variable duty cycle switch-mode regulator with an internal power switch. Refer to the block diagrams. Supply Voltage The MIC4575 operates from a +4V to +24V unregulated input. Highest efficiency operation is from a supply voltage around +15V. Enable/Shutdown The shutdown (SHDN) input is TTL compatible. Ground the input if unused. A logic-low enables the regulator. A logichigh shuts down the internal regulator which reduces the current to typically 50A. Feedback Fixed versions of the regulator have an internal resistive divider from the feedback (FB) pin. Connect FB directly to the output line. Adjustable versions require an external resistive voltage divider from the output voltage to ground, connected from the 1.23V tap to FB. Duty Cycle Control A fixed-gain error amplifier compares the feedback signal with a 1.23V bandgap voltage reference. The resulting error amplifier output voltage is compared to a 200kHz sawtooth waveform to produce a voltage controlled variable duty cycle output. A higher feedback voltage increases the error amplifier output voltage. A higher error amplifier voltage (comparator inverting input) causes the comparator to detect only the peaks of the sawtooth, reducing the duty cycle of the comparator output. A lower feedback voltage increases the duty cycle. Output Switching When the internal switch is on, an increasing current flows from the supply VIN, through external storage inductor L1, to output capacitor COUT and the load. Energy is stored in the inductor as the current increases with time. When the internal switch is turned off, the collapse of the magnetic field in L1 forces current to flow through fast recovery diode D1, charging COUT. Output Capacitor External output capacitor COUT provides stabilization and reduces ripple. Return Paths During the on portion of the cycle, the output capacitor and load currents return to the supply ground. During the off portion of the cycle, current is being supplied to the output capacitor and load by storage inductor L1, which means that D1 is part of the high-current return path.
Applications Information
The applications circuits that follow have been constructed and tested. Refer to Application Note 15 for additional information, including efficiency graphs and manufacturer's addresses and telephone numbers for most circuits.
L1
5
For a mathematical approach to component selection and circuit design, refer to Application Note 14.
SHDN
SW
2
3.3V/1A 8V to 24V C1 150F 35V
L1
5
68H
4
SHDN
SW
2
5.0V/1A
68H
4
6V to 24V C1 150F 35V
1
MIC4575-3.3BT VIN FB GND
3
D1 1N5819
C2 330F 16V
1
MIC4575-5.0BT VIN FB GND
3
D1 1N5819
C2 330F 16V
C1 C2 D1 L1 L1
Nichicon Nichicon Motorola Sumida Bi
UPL1V151MPH, ESR = 0.12 UPL1C331MPH, ESR = 0.12 1N5819 RCH106-680K, DCR = 0.22 HM77-11003, DCR = 0.233, Note 2
C1 C2 D1 L1 L2
Nichicon Nichicon Motorola Sumida Bi
UPL1J151MPH, ESR = 0.12 UPL1C331MPH, ESR = 0.12 1N5819 RCH106-680K, DCR = 0.22 HM77-11003, DCR = 0.233, Note 2
Figure 1. 6V-24V to 3.3V/1A Buck Converter Through Hole
5
Figure 2. 8V-24V to 5V/1A Buck Converter Through Hole
SW FB
2
L1 150H R2 13.0k 1% R1 1.50k 1%
12V/1A
SHDN MIC4575BT VIN GND
3
16V to 24V C1 68F 63V
1
4
MBR160
C2 330F 16V
C1 C2 D1 L1
Nichicon Nichicon Motorola Sumida
UPL1J680MPH, ESR = 0.17 UPL1C331MPH, ESR = 0.12 MBR160 RCH110-151K, DCR = 0.23
Note 2: Surfacemount component.
Figure 3. 16V-24V to 12V/1A Buck Converter, Through Hole 4-110 April 1998*
MIC4575
L1 68H
4
Micrel
3.3V/1A R2 2.49k 1% R1 1.50k 1% C3 3300pF L1
5
5
SHDN VIN GND
3
SW FB
2
SHDN
SW
2
3.3V/1A
6V to 24V C1 22F 35V
1
MIC4575BU
68H
4
D1
C2 330F 6.3V
6V to 24V C1 150F 35V
1
MIC4575-3.3BU VIN FB GND
3
D1 MBRS130LT3
C2 470F 16V
MBRS130LT3 C1 C2 D1 L1 AVX AVX Motorola Coiltronics TPSE226M035R0300, ESR = 0.3 TPSE337M006R0100, ESR = 0.1 MBRS130LT3 CTX68-4P, DCR = 0.238 C1 C2 D1 L1 L1 Sanyo Sanyo Motorola Coilcraft Bi 35CV150GX, ESR = 0.17 16CV470GX, ESR = 0.17 MBRS130LT3 DO3316P-683, DCR = 0.16 HM77-11003, DCR = 0.233
Figure 4. 6V-24V to 3.3V/1A Buck Converter Low-Profile Surface Mount
L1 68H
4
Figure 7. 6V-24V to 3.3V/1A Buck Converter Lower-Cost Surface Mount
5V/1A
5
SHDN VIN GND
3
SW FB
2
8V to 24V C1 22F 35V
1
MIC4575BU
D1
R2 3.01k 1% R1 1.00k 1%
L1
C3 3300pF
5
SHDN
SW
2
5V/1A C2 470F 16V
C2 220F 10V
68H
4
8V to 24V C1 150F 35V
1
MIC4575-5.0BU FB VIN GND
3
MBRS130LT3 C1 C2 D1 L1 AVX AVX Motorola Coiltronics TPSE226M035R0300, ESR = 0.3 TPSE227M010R0100, ESR = 0.1 MBRS130LT3 CTX68-4P, DCR = 0.238
D1 MBRS130LT3
Figure 5. 8V-24V to 5V/1A Buck Converter Low-Profile Surface Mount
L1 150H
4
C1 C2 D1 L1 L1
Sanyo Sanyo Motorola Coilcraft Bi
35CV150GX, ESR = 0.17 16CV470GX, ESR = 0.17 MBRS130LT3 DO3316P-683, DCR = 0.16 HM77-11003, DCR = 0.233
4
12V/1A
Figure 8. 8V-24V to 5V/1A Buck Converter Lower-Cost Surface Mount
12V/1A
5
5
SHDN VIN GND
3
SW FB
2
16V to 24V C1 10F 50V
1
MIC4575BU
R2 13.0k 1% R1 1.50k 1%
SHDN VIN GND
3
SW FB
2
L1 150H R2 13.0k 1% R1 1.50k 1%
C3 3300pF
D1 SS26
C2 68F 20V
16V to 24V C1 47F 50V X2 C1 C2 D1 L1
MIC4575BU
1
4
SS26
C2 470F 16V
C1 C2 D1 L1
Tokin C55YU1H106Z AVX TPSE686M020R0150, ESR = 0.15 General Instruments SS26 Coiltronics CTX150-4, DCR = 0.372
Nichicon UUX1H470MT1GS, ESR = 0.4 Sanyo 16CV470GX, ESR = 0.17 General Instruments SS26 Coiltcraft DO5022P-154, DCR = 0.218
Figure 6. 16V-24V to 12V/1A Buck Converter Low-Profile Surface Mount
Figure 9. 16V-24V to 12V/1A Buck Converter Lower-Cost Surface Mount
8V to 18V
1
VIN
SW
2
5
C1 150F 35V
MIC4575-5.0BT SHDN FB GND
3
4
L1 10H
C1 Nichicon
UPL1V151MPH ESR = 0.13 C2 Nichicon UPL1C681MPH ESR = 0.065 D1 Motorola 1N5819 L1 Coiltronics PL52A-10-500 DCR = 0.045
D1 1N5819
C2 680F 16V -5V/0.2A
Figure 10. 8V-18V to -5V/0.2A Buck-Boost Converter Through Hole
April 1998*
4-111
MIC4575
Micrel
4.75V to 5.25V
1
VIN
SW
2
5
C1 150F 35V
MIC4575BT SHDN FB GND
3
4
C4 1000pF R4 5.1K R1 3.01k 1%
L1 15H
D1 C3 0.01F 1N5819
C2 680F 16V -5V/0.3A
R2 1.00K 1% C1 C2 D1 L1 Nichicon Nichicon Motorola Coiltronics
R3 10K
UPL1V151MPH, ESR = 0.12 UPL1C681MPH, ESR = 0.065 1N5819 PL52A-15-500, DCR = 0.054
Figure 11. 5V to -5V/0.3A Buck-Boost Converter Through Hole
VOUT 5V/1A R2 3.01k 1% R1 1.00K 1% C3 3300pF 5mVP-P C2 220F 10V
5
SHDN MIC4575BU VIN GND
3
SW FB
2
4
T1 68H
L1
3
VIN 8V to 18V C1 22F 35V C1 C2 C4 D1 T1 L1
1H
4 1 2
1
D1 MBRS130LT3
C4 220F 10V
AVX AVX AVX Motorola Coiltronics Coilcraft
TPSE226M035R0300, ESR = 0.3 TPSE227M010R0100, ESR = 0.1 TPSE227M010R0100, ESR = 0.1 MBRS130LT3 CTX68-4P, DCR = 0.238 DO1608C-102
Figure 12. Low Output-Noise Regulator (5mV Output Ripple )
+VOUT/+IOUT 5V/0.5A R2 3.01k 1% R1 1.00K 1%
4
5
SHDN MIC4575BU VIN GND
3
SW FB
2
2
T1 68H
1
VIN 8V to 18V C1 22F 35V
1
4
C3 3300pF C2 220F 10V
D1 MBRS130LT3 C5 220F 10V
3
L1 D2 MBRS130LT3
C4 220F 10V -VOUT/-IOUT -5V/0.5A at VIN 15V Load Regulation5%
+IOUT + IOUT
C1 C2 C4 C5 D1 D2 T1 AVX AVX AVX AVX Motorola Motorola Coiltronics TPSE226M035R0300, ESR = 0.3 TPSE227M010R0100, ESR = 0.1 TPSE227M010R0100, ESR = 0.1 TPSE227M010R0100, ESR = 0.1 MBRS130LT3 MBRS130LT3 CTX68-4P, DCR = 0.238
1A
DC DC DC
+VOUT 0.5V VIN 0.5V 40% then 40% then IOUT IOUT +IOUT IOUT (1
DC)
Figure 13. Split 5V Supply
4-112
April 1998*
MIC4575
Micrel
Q1 2N4339 R3 3.3K L1 68H
4
5
SHDN VIN GND
3
SW FB
2
VIN 4V to 24V C1 150F 35V
MIC4575BT
1
R1 200K R2 15k
D1 1N5819
U2 LM4041CIZ-1.2 VOUT (0-12V)/0.5A VOUT Min = 60mV R4 C2 330F 330 0.5W 16V
C1 C2 D1 L1 U2
Nichicon Nichicon Motorola Coiltronics Micrel
UPL1V151MPH, ESR = 0.12 UPL1C331MPH, ESR = 0.12 1N5819 PL52B-68-500, DCR = 0.095 LM4041CIZ-1.2
VIN min VIN min
VOUT 0.9
and
1.5V
VOUT
2.5V
Figure 14. Adjustable (0V-12V) Output-Voltage Regulator
U1
5
SHDN MIC4575BT VIN GND
3
SW FB
2
L1 68H
3
VOUT 1V/1A
VIN 4V to 15V
1
4
1 2
U2 LM358
C1 150F 35V
C2 330F 16V
4
R3 1k
D1 1N5819
R1 249 1%
R2 1.00k 1%
C1 C2 D1 L1 U2
Nichicon UPL1V151MPH, ESR = 0.12 Nichicon UPL1C331MPH, ESR = 0.12 Motorola 1N5819 Coiltronics PL52B-68-500, DCR = 0.095 National LM358
Figure 15. Low Output-Voltage Regulator (1V)
L1 68H
4
5
SHDN MIC4575BT VIN GND
3
SW FB
2
R1 R2 200 1% 0.25 R3 10K
D2 1N5819 C2 330F 16V
IOUT 1A 6-8 Cells VBATT
VIN 9V to 24V C1 150F 35V C1 C2 D1 L1 U2 Q1 R1 Nichicon Nichicon Motorola Coiltronics National Siliconix KRL
1
D1 1N5819 Q1 VN2222LL
U2 LM358
1
3
UPL1V151MPH, ESR = 0.12 UPL1C331MPH, ESR = 0.12 1N5819 PL52B-68-500, DCR = 0.095 LM358 VN2222LL SP-1/2-A1-0R250J
2
C3 C4 1000pF 0.01F R4 3k DZ1 1N5244 14V
VIN min IOUT
VBATT 0.9 1.23V R5
2.5V
R2 R1
R5 1.00k 1%
Figure 16. 1A Battery Charger (6-8 cells)
April 1998*
4-113
MIC4575
Micrel
D3 1N4148
5
L1 68H
SHDN
SW
2
R1 0.1 R2 100 1% C2 330F 16V
D2 1N5819
IOUT 0.1A to 1A 2-8 Cells VBATT
VIN 8V to 24V
1
MIC4575-BT FB VIN GND
3
4
R6 3k C4 1000pF
D1 1N5819
VIN R5 10k
C1 150F 35V U1 U2 U3 C1 C2 D1 D2 D3 L1 R1 Q1 Micrel National Micrel Nichicon Nichicon Motorola Motorola Motorola Coiltronics KRL Siliconix
3
R7 1k MIC4575BT LM358 LM4041CIZ-1.2 UPL1V151MPH, ESR = 0.12 UPL1C331MPH, ESR = 0.12 1N5819 1N5819 1N4148 PL52B-68-500, DCR = 0.095 SP-1-A1-0R100J VN2222LL
1 2
U2A 1/2LM358
R3 10k
VIN
8
U2B 1/2 LM358
5
C3
7
VR1 10k
U3 LM4041CIZ-1.2
0.01F
DZ1 1N5244 14V R4 1.21k 1%
Q1 VN2222LL
6 4
VIN min
VBATT / 0.9
2.5V
Figure 17. 0.1A-1A Variable-Current Battery Charger
D3 1N4148
5
L1 68H D1 1N5819
SHDN MIC4575-BT VIN GND
3
SW FB
2
R1 0.1 R2 100 1% C2 330F 16V
D2 1N5819
IOUT 1A 2-8 Cells VBATT
VIN 8V to 24V
1
4
R5 3k C4 1000pF
C1 150F 35V
R6 1k
3 1 2
U2A 1/2LM358
R3 10k
C3 U1 U2 C1 C2 D1 D2 D3 L1 R1 Q1 Micrel National Nichicon Nichicon Motorola Motorola Motorola Coiltronics KRL Siliconix MIC4575BT LM358 UPL1V151MPH, ESR = 0.12 UPL1C331MPH, ESR = 0.12 1N5819 1N5819 1N4148 PL52B-68-500, DCR = 0.095 SP-1-A1-0R100J VN2222LL 0.01F DZ1 1N5244 14V VIN
8 5
U2B 1/2 LM358
7
VIN min IOUT
VBATT / 0.9 1.23V R4 R2 R1
2.5V
6 4
Q1 VN2222LL
R4 1.21k 1%
Figure 18. 1A Battery Charger (2-8 Cells)
4-114
April 1998*
MIC4575
Micrel
VIN 8V to 24V
U1
1
VIN SD GND
3
VSW MIC4575BT FB
2
L1 68H D1 MBR160 C2 68F 63V C3 0.01F R1 30
10 ft Wire 0.5 +V
VOUT 5V/1A
C1 68F 63V
5
4
+VSENSE R2 3.01k 1% R3 1.00k 1% C4 220F 10V -VSENSE
C1 C2 C4 D1 L1
Nichicon Nichicon AVX Motorola Coiltronics
UPL1J680MPH, ESR = 0.17 UPL1J680MPH, ESR = 0.17 TPSE227M010R0100, ESR = 0.1 MBRS160 PL52B-68-500, DCR = 0.095
R4 10 -V
Figure 19. Remote-Sensing Regulator
5
SHDN MIC4575BU
SW
2
Q1 Si9435 D3 1N4148
C2 68F
2
T1 150H
1
VOUT 12V/100mA R2 13.0k 1% R1 1.50K 1% R3 1k C4 68F 20V -VOUT -12V/100mA (-11V to -12V) C5 3300pF C3 68F 20V
VIN 6V to 18V C1 22F 35V
1
VIN
GND
3
FB
4 3
T1
4
D1 MBRS130LT3
4
C1 C2 C3 C4 D1 D2 T1 Q1
AVX AVX AVX AVX Motorola Motorola Coiltronics Siliconix
TPSE226M035R0300, ESR = 0.3 TPSE686M020R0150, ESR = 0.15 TPSE686M020R0150, ESR = 0.15 TPSE686M020R0150, ESR = 0.15 MBRS130LT3 MBRS130LT3 CTX150-4, DCR = 0.372 Si 9435, PMOS
D2 MBRS130LT3
Figure 20. 6V-18V to Split 12V/100mA Supply
U1
5
L1 68H SW
2
D2 1N5819 C2 330F 16V
IOUT 1A VBATT 2-8 Cells
SHDN MIC4575BU
VIN 8V to 24V C1 150F 35V
D1 1N5819 FB
4
1
VIN
C3 0.1F
GND
3
R3 VIN 113k 1% 0.01F
8 8 7 6 5 4
R2 10k 1% DZ1 1N5244 14V
R1 0.1
C4
U2B 1/2 LM358 U1 Micrel U2 National C1 Nichicon C2 Nichicon D1 Motorola D2 Motorola DZ1 Motorola L1 Bi R1 KRL MIC4575BT LM358 UPL1V151MPH, ESR = 0.12 UPL1C331MPH, ESR = 0.12 1N5819 1N5819 1N5244 HM77-11003, DCR = 0.233 SP-1/2-A1-0R100J
R4 10k
VIN min IOUT =
=
VBATT + 2.5V 0.9 R2 R2 R3
1.23V R1
Figure 21. 1A Battery Charger
April 1998*
4-115
MIC4575
Micrel
U1
5
L1 68H SW
2
VOUT 0V-12V VOUTmin = 60mV C3 3300pF R1 20k 1% C2 1000F 16V R6 330 0.5W
SHDN MIC4575BT
VIN 4V to 24V C1 150F 35V
D1 1N5819 FB
4
1
VIN
GND
3
VIN C4 0.01F
7 6 4 3
5
8
2
U2A
1
R2 2k 1%
U2B 1/2LM358
1/2LM358
R6 220
R3 20k 1%
R4 2k 1% R5 10K
U1 U2 C1 C2 D1 L1
Micrel National Nichicon Nichicon Motorola Bi
MIC4575BT LM358 UPL1V151MPH, ESR = 0.12 UPL1C102MPH, ESR = 0.047 1N5819 HM77-11003, DCR = 0.233
VIN min
=
VOUT + 2.5V 0.9 1 R1 R2
VOUT max = 1.23V
R1 = R3 and R2 = R4
Figure 22. Improved Adjustable Output-Voltage Regulator (0V-12V)
D3 U1
5
1N4148 SW
2
L1 68H R2 100 1%
3
R1 0.1
IOUT 1A C2 330F 16V
SHDN MIC4575BT
VIN 8V to 24V C1 150F 35V
1
VIN
GND
3
FB
4
R5 3k R6 1k C4 1000pF VIN
D1 1N5819
U2A 1/2LM358
1
C3 0.01F C5 0.01F
7
2
R3 10k
5 8
DZ1 1N5236 7.5V
U2B 1/2 LM358
6
4
Q1 VN2222LL
R7 100k
R8 100k U3
2 3 7
Bat A U1 Micrel U2 National U3 Micrel C1 Nichicon C1 Nichicon D1 Motorola D2 Motorola DZ1 Motorala L1 Bi Q1 Siliconix R1 KRL MIC4575BT LM358 MIC2506BM UPL1V151MPH, ESR = 0.12 UPL1C331MPH, ESR = 0.12 1N5819 1N5819 1N5236 HM77-11003, DCR = 0.233 VN2222LL SP-1/2-A1-0R100J R4 1.21k 1% Bat B
FLG A FLG B
IN OUT A MIC2506 OUT B GND
6
8
1 1 2 4
CTL A CTL B
5
R10 510k
A/B
U4A 7404
R9 510k
Bat B 4 Cells NiCad
Bat A 4 Cells NiCad
Figure 23. Switchable Battery-Pack Charger
4-116
April 1998*
MIC4575
Micrel
D3 U1
5
1N4148 SW
2
L1 68H R2 100 1%
3
R1 0.1
D2 1N5819 C2 330F 16V
IOUT 1A VBATT 2 Li Cells
SHDN MIC4575BT
VIN 12V to 24V C1 150F 35V U1 Micrel U2 National U3 National U4 National C1 Nichicon C1 Nichicon D1 Motorola D2 Motorola DZ1 Motorala L1 Bi R1 KRL Q1 Siliconix
1
VIN
GND
3
FB
4
R6 3k R7 1k C4 1000pF VIN
D1 1N5819
U2A 1/2LM358
1
R5 1.0k 1%
MIC4575BT LM358 LM3420 LM339 UPL1V151MPH, ESR = 0.12 UPL1C331MPH, ESR = 0.12 1N5819 1N5819 1N5244 HM77-11003, DCR = 0.233 SP-1/2-A1-0R100J VN2222LL
C3 0.01F C5 0.1F
7
2
5 8
U2B 1/2 LM358
6
4
Q1 VN2222LL U3
3 8
COMP
IN
1.24V IOUT = R3 IOUT = 1.02A VIN min > = IOUTEND IOUTEND
R2 R1
VIN R8 10k R9 10M VIN R10 10k
R3 1.21k 1%
C8 0.01F Q2 2N2222
1
LM3420 OUT GND
4
C7 0.01F
7
VBATT + 2.5V 0.9 60mA R5 R2 - R4 R3 R1
END
C6 0.1F
1
R4 13.0k 1%
R12 100k
3
4
6 12
LM339
1.23V
Figure 24. Lithium-Ion Battery Charger with End-of-Charge Flag
U1
5
L1 68H SW
2
6.0V R2 3.92k 1%
L2 1H C3 3300pF C2 220F 10V C3 100F 10V
U2
1
SHDN MIC4575BU
VIN GND
2
VOUT MIC29150
3
VOUT 5V/1A
VIN 9V to 18V C1 22F 35V
1
VIN
GND
3
FB
4
D1 MBRS130LT3
R1 1.00k 1%
C4 22F 10V
U1 U2 C1 C2 C3 C4 D1 D2 L1 L2
Micrel Micrel AVX AVX AVX Sprague Motorola Motorola Bi Coilcraft
MIC4575BU MIC29150-5.0BU TPSE226M035R0300, ESR = 0.3 TPSE227M010R0100, ESR = 0.1 TPSE106M010R0200, ESR = 0.2 293D226X0010C2W MBRS130LT3 MBRS130LT3 HM77-11003, DCR = 0.233 D016087C-102, DCR = 0.05
VOUT = 1.23
1+
R2 R1
Figure 25. Low Output-Noise Regulator (<1mV)
April 1998*
4-117

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