MIC4575-5.0BT [MICREL]
200kHz Simple 1A Buck Voltage Regulator; 在200kHz简易1A降压稳压器
| 型号： | MIC4575-5.0BT |
| 厂家： | 
MICREL SEMICONDUCTOR |
| 描述： | 200kHz Simple 1A Buck Voltage Regulator |
| 文件： | 总12页 (文件大小：216K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MIC4575
200kHz Simple 1A Buck Voltage Regulator
General Description
Features
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.
• 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
• < 200µA typical shutdown mode
• 75% efficiency (adjustable version > 75% typical)
• Standard inductors and capacitors are
25% of typical LM2575 values.
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%.
• Thermal shutdown
In shutdown mode, the regulator draws less than 200µA
standby current. The regulator performs cycle-by-cycle
current limiting and thermal shutdown for protection under
fault conditions.
• 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 Pentium™
and similar microprocessors
This series of simple switch-mode regulators requires a
minimum number of external components and can operate
using a standard series of inductors. Frequency compensa-
tion is provided internally.
The MIC4575 is available in TO-220 (T) and TO-263 (U)
packages for the industrial temperature range.
Typical Applications
L1
5.0V/1A
Shutdown
Enable
5
1
2
SHDN
SW
68µH
MIC4575-5.0BT
VIN
8V to 24V
4
C2
330µF
16V
FB
C1
150µF
35V
GND
D1
3
1N5819
Fixed Regulator
L1
3.6V/1A
5
2
Shutdown
Enable
SHDN
SW
R2
68µH
C3
3300pF
2.37k
1%
MIC4575BU
1
4
6V to 24V
C2
330µF
6.3V
VIN
FB
C1
22µF
35V
GND
R1
1.24k
1%
D1
3
MBRS130LT3
Adjustable Regulator
4-106
April 1998•
MIC4575
Micrel
Ordering Information
Part Number
Voltage
3.3V
Temperature Range
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
Package
MIC4575-3.3BT
MIC4575-5.0BT
MIC4575BT
5-lead TO-220
5-lead TO-220
5-lead TO-220
5-lead TO-263
5-lead TO-263
5-lead TO-263
5.0V
Adjustable
3.3V
MIC4575-3.3BU
MIC4575-5.0BU
MIC4575BU
5.0V
Adjustable
Pin Configuration
5
4
3
2
1
SHDN
FB
GND
SW
VIN
5-Lead TO-220 (T)
4
5
SHDN
FB
GND
SW
4
3
2
1
VIN
5-Lead TO-263 (U)
Pin Description
Pin Number
Pin Name
VIN
Pin Function
Supply Voltage (Input): Unregulated +4V to +40V supply voltage.
1
2
SW
Switch (Output): Emitter of NPN output switch. Connect to external storage
inductor and Shottky diode.
3, TAB
4
GND
FB
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.
5
SHDN
Shutdown (Input): Logic low enables regulator. Logic high (> 2.4V) shuts
down regulator.
April 1998•
4-107
MIC4575
Micrel
Absolute Maximum Ratings
Operating Ratings
Supply Voltage (V ) Note 1 .......................................+40V
Supply Voltage (V ) ...................................................+24V
IN
IN
Shutdown Voltage (V
) .......................... –0.3V to +36V
Junction Temperature ............................................. +150°C
SHDN
Output Switch (V ) steady state .................................–1V
Package Thermal Resistance
SW
TO-220, TO-263 (θ ) .........................................65°C/W
Storage Temperature (T ) ......................... –65°C to 150°C
JA
S
TO-220, TO-263 (θ ) ...........................................2°C/W
JA
Electrical Characteristics
VIN = 12V; ILOAD = 200mA; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +85°C; unless noted.
Parameter
Condition
Min
Typ
Max
Units
MIC4575 [Adjustable]
Feedback Voltage
Feedback Voltage
1.217 1.230 1.243
1.193 1.230 1.267
V
8V ≤ VIN ≤ 24V, 0.2A ≤ ILOAD ≤ 1A
V
V
1.180
1.280
Efficiency
ILOAD = 1A, VOUT = 5V
77
50
%
Feedback Bias Current
100
500
nA
nA
MIC4575-3.3
Output Voltage
Output Voltage
3.234
3.3
3.3
3.366
V
6V ≤ VIN ≤ 24V, 0.2A ≤ ILOAD ≤ 1A
3.168
3.135
3.432
3.465
V
V
Efficiency
ILOAD = 1A
72
%
MIC4575-5.0
Output Voltage
Output Voltage
4.900
5.0
5.0
5.100
V
8V ≤ VIN ≤ 24V, 0.2A ≤ ILOAD ≤ 1A
4.800
4.750
5.200
5.250
V
V
Efficiency
ILOAD = 1A
77
%
MIC4575 / -3.3 / -5.0
Oscillator Frequency
Saturation Voltage
180
90
200
1
220
kHz
I
OUT = 1A
1.3
1.5
V
V
Maximum Duty Cycle (On)
Current Limit
FB connected to 0V
95
%
Peak Current, tON ≤ 3µs
1.7
1.3
2.2
3.0
3.2
A
A
Output Leakage Current
VIN = 24V, FB connected to 0V
Output = 0V
0
7.5
2
30
mA
mA
Output = –1V
Quiescent Current
5
10
mA
Standby Quiescent Current
SHDN Input Logic Level
SHDN = 5V (regulator off)
VOUT = 0V (regulator off)
50
1.4
200
µA
2.2
2.4
V
V
VOUT = 3.3 or 5V (regulator on)
1.2
1.0
0.8
V
V
SHDN Input Current
SHDN = 5V (regulator off)
SHDN = 0V (regulator on)
4
0.01
30
10
µA
µA
–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
CIN
Shutdown
Enable
Internal
Regulator
SHDN
Thermal
Shutdown
Current
Limit
200kHz
Oscillator
Driver
Com-
parator
L1
SW
VOUT
COUT
1A
Switch
D1
1.23V
Bandgap
Error
Amp.
R1
R2
GND
FB
MIC4575-x.x
4
Block Diagram with External Components
Fixed Step-Down Regulator
+24V max.
VIN
CIN
Shutdown
Enable
Internal
Regulator
SHDN
1
2
V
V
+
OUT
RE
Thermal
Shutdown
Current
Limit
200kHz
Oscillator
OUT
R1
R
REF
Driver
Com-
parator
L1
SW
VOUT
COUT
1A
Switch
D1
1.23V
Bandgap
Error
Amp.
R1
R2
FB
[Adjustable]
MIC4575
GND
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.
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 com-
parator output. A lower feedback voltage increases the duty
cycle.
Supply Voltage
The MIC4575 operates from a +4V to +24V unregulated
input. Highest efficiency operation is from a supply voltage
around +15V.
Output Switching
Enable/Shutdown
When the internal switch is on, an increasing current flows
The shutdown (SHDN) input is TTL compatible. Ground the
input if unused. A logic-low enables the regulator. A logic-
high shuts down the internal regulator which reduces the
current to typically 50µA.
from the supply V through external storage inductor L1, to
IN,
output capacitor C
and the load. Energy is stored in the
OUT
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
Feedback
Fixed versions of the regulator have an internal resistive
divider from the feedback (FB) pin. Connect FB directly to the
output line.
recovery diode D1, charging C
.
OUT
Output Capacitor
External output capacitor C
provides stabilization and
OUT
Adjustable versions require an external resistive voltage
divider from the output voltage to ground, connected from the
1.23V tap to FB.
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.
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.
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.
For a mathematical approach to component selection and
circuit design, refer to Application Note 14.
L1
L1
3.3V/1A
5.0V/1A
5
1
2
4
5
1
2
4
SHDN
MIC4575-3.3BT
VIN FB
SW
SHDN
MIC4575-5.0BT
VIN FB
SW
68µH
68µH
6V to 24V
8V to 24V
C2
330µF
16V
C2
330µF
16V
C1
150µF
35V
C1
150µF
35V
GND
GND
3
D1
1N5819
D1
1N5819
3
C1 Nichicon UPL1V151MPH, ESR = 0.12Ω
C2 Nichicon UPL1C331MPH, ESR = 0.12Ω
D1 Motorola 1N5819
C1 Nichicon UPL1J151MPH, ESR = 0.12Ω
C2 Nichicon UPL1C331MPH, ESR = 0.12Ω
D1 Motorola 1N5819
L1 Sumida
L1 Bi
RCH106-680K, DCR = 0.22Ω
HM77-11003, DCR = 0.233Ω, Note 2
L1 Sumida
L2 Bi
RCH106-680K, DCR = 0.22Ω
HM77-11003, DCR = 0.233Ω, Note 2
Figure 1. 6V–24V to 3.3V/1A Buck Converter
Through Hole
Figure 2. 8V–24V to 5V/1A Buck Converter
Through Hole
L1
12V/1A
5
2
4
SHDN
SW
FB
150µH
R2
MIC4575BT
13.0k
1%
16V to 24V
1
C2
330µF
16V
VIN
C1
68µF
63V
GND
3
R1
1.50k
1%
MBR160
C1 Nichicon UPL1J680MPH, ESR = 0.17Ω
C2 Nichicon UPL1C331MPH, ESR = 0.12Ω
D1 Motorola MBR160
L1 Sumida
RCH110-151K, DCR = 0.23Ω
Note 2: Surface-
Figure 3. 16V–24V to 12V/1A Buck Converter, Through Hole
mount component.
4-110
April 1998•
MIC4575
Micrel
L1
L1
3.3V/1A
C2
330µF
6.3V
5
2
4
3.3V/1A
5
1
2
4
SHDN
SW
FB
SHDN
MIC4575-3.3BU
VIN FB
SW
R2
2.49k
1%
68µH
68µH
C3
3300pF
MIC4575BU
1
6V to 24V
6V to 24V
C2
470µF
16V
VIN
C1
22µF
35V
C1
150µF
35V
GND
R1
1.50k
1%
GND
3
D1
MBRS130LT3
D1
3
MBRS130LT3
C1 AVX
C2 AVX
TPSE226M035R0300, ESR = 0.3Ω
TPSE337M006R0100, ESR = 0.1Ω
C1 Sanyo
C2 Sanyo
35CV150GX, ESR = 0.17Ω
16CV470GX, ESR = 0.17Ω
D1 Motorola MBRS130LT3
D1 Motorola MBRS130LT3
L1 Coiltronics CTX68-4P, DCR = 0.238Ω
L1 Coilcraft
L1 Bi
DO3316P-683, DCR = 0.16Ω
HM77-11003, DCR = 0.233Ω
Figure 4. 6V–24V to 3.3V/1A Buck Converter
Low-Profile Surface Mount
Figure 7. 6V–24V to 3.3V/1A Buck Converter
Lower-Cost Surface Mount
L1
5V/1A
5
1
2
4
L1
SHDN
SW
FB
5V/1A
5
1
2
4
R2
3.01k
1%
68µH
C3
3300pF
SHDN
MIC4575-5.0BU
VIN FB
SW
MIC4575BU
68µH
8V to 24V
C2
220µF
10V
VIN
8V to 24V
C2
470µF
16V
C1
22µF
35V
GND
R1
1.00k
1%
D1
C1
150µF
35V
3
GND
3
D1
MBRS130LT3
MBRS130LT3
C1 AVX
C2 AVX
TPSE226M035R0300, ESR = 0.3Ω
TPSE227M010R0100, ESR = 0.1Ω
C1 Sanyo
C2 Sanyo
35CV150GX, ESR = 0.17Ω
16CV470GX, ESR = 0.17Ω
D1 Motorola MBRS130LT3
L1 Coiltronics CTX68-4P, DCR = 0.238Ω
D1 Motorola MBRS130LT3
L1 Coilcraft
L1 Bi
DO3316P-683, DCR = 0.16Ω
HM77-11003, DCR = 0.233Ω
Figure 5. 8V–24V to 5V/1A Buck Converter
Low-Profile Surface Mount
4
Figure 8. 8V–24V to 5V/1A Buck Converter
Lower-Cost Surface Mount
L1
L1
12V/1A
12V/1A
5
1
2
4
5
2
SHDN
SW
FB
SHDN
SW
FB
R2
13.0k
1%
150µH
150µH
R2
C3
3300pF
MIC4575BU
13.0k
1%
MIC4575BU
16V to 24V
16V to 24V
4
C2
68µF
20V
1
C2
470µF
16V
VIN
VIN
C1
10µF
50V
C1
47µF
50V
X2
GND
R1
1.50k
1%
GND
3
R1
1.50k
1%
D1
SS26
SS26
3
C1 Tokin
C2 AVX
C55YU1H106Z
TPSE686M020R0150, ESR = 0.15Ω
C1 Nichicon UUX1H470MT1GS, ESR = 0.4Ω
C2 Sanyo
16CV470GX, ESR = 0.17Ω
D1 General Instruments SS26
D1 General Instruments SS26
L1 Coiltcraft DO5022P-154, DCR = 0.218Ω
L1 Coiltronics CTX150-4, DCR = 0.372Ω
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
2
4
VIN
SW
MIC4575-5.0BT
SHDN
5
FB
C1
150µF
35V
L1
10µH
GND
3
C1 Nichicon UPL1V151MPH
ESR = 0.13Ω
C2 Nichicon UPL1C681MPH
ESR = 0.065Ω
C2
680µF
16V
D1
D1 Motorola 1N5819
L1 Coiltronics PL52A-10-500
DCR = 0.045Ω
-5V/0.2A
1N5819
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
5
2
4
VIN
SW
FB
MIC4575BT
SHDN
C4
1000pF
C1
150µF
35V
L1
GND
3
15µH
R4
5.1K
R1
3.01k
1%
C2
680µF
16V
D1
R2
1.00K
1%
R3
10K
C3
0.01µF
-5V/0.3A
1N5819
C1 Nichicon UPL1V151MPH, ESR = 0.12Ω
C2 Nichicon UPL1C681MPH, ESR = 0.065Ω
D1 Motorola 1N5819
L1 Coiltronics PL52A-15-500, DCR = 0.054Ω
Figure 11. 5V to –5V/0.3A Buck-Boost Converter
Through Hole
VOUT
5V/1A
T1
L1
68µH
5
1
2
4
4
1
3
2
SHDN
MIC4575BU
VIN
SW
FB
1µH
R2
3.01k
1%
5mVP-P
VIN
8V to 18V
C3
3300pF
C2
220µF
10V
C1
22µF
35V
GND
3
R1
1.00K
1%
C4
220µF
10V
D1
MBRS130LT3
C1 AVX
C2 AVX
C4 AVX
TPSE226M035R0300, ESR = 0.3Ω
TPSE227M010R0100, ESR = 0.1Ω
TPSE227M010R0100, ESR = 0.1Ω
D1 Motorola MBRS130LT3
T1 Coiltronics CTX68-4P, DCR = 0.238Ω
L1 Coilcraft
DO1608C-102
Figure 12. Low Output-Noise Regulator (5mV Output Ripple )
+VOUT/+IOUT
5V/0.5A
T1
68µH
5
1
2
4
2
1
SHDN
MIC4575BU
VIN
SW
FB
R2
3.01k
1%
VIN
8V to 18V
C3
3300pF
C2
220µF
10V
C1
22µF
35V
GND
3
R1
1.00K
1%
D1
MBRS130LT3
4
3
C5
220µF
10V
C4
220µF
10V
L1
D2
MBRS130LT3
-VOUT/-IOUT
-5V/0.5A
at VIN ≥15V
+IOUT
D
IOUT 1A
+VOUT 0.5V
0.5V
C1 AVX
C2 AVX
C4 AVX
C5 AVX
TPSE226M035R0300, ESR = 0.3Ω
TPSE227M010R0100, ESR = 0.1Ω
TPSE227M010R0100, ESR = 0.1Ω
TPSE227M010R0100, ESR = 0.1Ω
Load Regulation≈±5%
V
IN
D40% then IOU+IOUT
D40% then IOUIOU(1 DC)
D1 Motorola MBRS130LT3
D2 Motorola MBRS130LT3
T1 Coiltronics CTX68-4P, DCR = 0.238Ω
Figure 13. Split ±5V Supply
4-112
April 1998•
MIC4575
Micrel
Q1
2N4339
R3
3.3K
U2
L1
LM4041CIZ-1.2 VOUT
5
1
2
4
SHDN
SW
FB
(0-12V)/0.5A
OUT Min = 60mV
68µH
VIN
4V to 24V
R1
200K
V
MIC4575BT
R4
C2
330µF
16V
VIN
330Ω
0.5W
C1
150µF
35V
GND
3
D1
1N5819
R2
15k
V
C1 Nichicon UPL1V151MPH, ESR = 0.12Ω
C2 Nichicon UPL1C331MPH, ESR = 0.12Ω
D1 Motorola 1N5819
OUT
V
1.5V
2.5V
IN min
0.9
and
L1 Coiltronics PL52B-68-500, DCR = 0.095Ω
U2 Micrel
LM4041CIZ-1.2
V
V
OUT
IN
min
Figure 14. Adjustable (0V–12V) Output-Voltage Regulator
U1
L1
68µH
VOUT
1V/1A
5
1
2
4
SHDN
MIC4575BT
VIN
SW
FB
VIN
4V to 15V
3
2
1
U2
LM358
4
GND
3
C2
330µF
16V
R3
1k
C1
150µF
35V
D1
1N5819
R1
R2
249Ω
1%
1.00k
1%
C1 Nichicon UPL1V151MPH, ESR = 0.12Ω
C2 Nichicon UPL1C331MPH, ESR = 0.12Ω
D1 Motorola 1N5819
L1 Coiltronics PL52B-68-500, DCR = 0.095Ω
U2 National LM358
Figure 15. Low Output-Voltage Regulator (1V)
D2
1N5819
IOUT
1A
L1
R1
5
1
2
SHDN
SW
FB
68µH
0.25Ω
R2
200Ω
1%
VIN
9V to 24V
C2
330µF
16V
R3
10K
6-8 Cells
VBATT
MIC4575BT
4
VIN
C1
150µF
35V
GND
3
D1
U2
LM358
1N5819
3
2
1
Q1
C1 Nichicon UPL1V151MPH, ESR = 0.12Ω
C2 Nichicon UPL1C331MPH, ESR = 0.12Ω
D1 Motorola 1N5819
VN2222LL
C3
L1 Coiltronics PL52B-68-500, DCR = 0.095Ω
C4
1000pF
U2 National
Q1 Siliconix
R1 KRL
LM358
VN2222LL
SP-1/2-A1-0R250J
0.01µF
DZ1
1N5244
14V
V
BATT
R4
3k
V
2.5V
IN min
0.9
1.23V R2
R5 R1
IOUT
R5
1.00k
1%
Figure 16. 1A Battery Charger (6–8 cells)
April 1998•
4-113
MIC4575
Micrel
D3
1N4148
L1
68µH
D2
1N5819
IOUT
0.1A to 1A
R1
0.1Ω
5
1
2
4
SHDN
MIC4575-BT
VIN
SW
FB
VIN
8V to 24V
D1
1N5819
R6
3k
C2
330µF
16V
2-8 Cells
VBATT
R2
100Ω
1%
VIN
C4
1000pF
GND
3
C1
150µF
35V
3
R5
10k
U2A
1/2LM358
1
R7
1k
R3
10k
VIN
U2B
1/2 LM358
2
8
U1 Micrel
U2 National
U3 Micrel
MIC4575BT
LM358
LM4041CIZ-1.2
5
VR1
10k
U3
C3
LM4041CIZ-1.2
7
C1 Nichicon UPL1V151MPH, ESR = 0.12Ω
C2 Nichicon UPL1C331MPH, ESR = 0.12Ω
D1 Motorola 1N5819
6
DZ1
1N5244
14V
Q1
VN2222LL
0.01µF
4
D2 Motorola 1N5819
D3 Motorola 1N4148
L1 Coiltronics PL52B-68-500, DCR = 0.095Ω
R1 KRL
Q1 Siliconix
SP-1-A1-0R100J
VN2222LL
R4
1.21k
1%
V
VBATT / 0.9
2.5V
IN min
Figure 17. 0.1A–1A Variable-Current Battery Charger
D3
1N4148
L1
68µH
D2
1N5819
IOUT
1A
R1
0.1Ω
5
1
2
4
SHDN
MIC4575-BT
VIN
SW
FB
VIN
8V to 24V
R5
3k
D1
1N5819
C2
330µF
16V
2-8 Cells
VBATT
R2
100Ω
1%
C4
1000pF
GND
3
R6
1k
C1
150µF
35V
3
2
U2A
1/2LM358
1
R3
10k
C3
U1 Micrel
U2 National
MIC4575BT
LM358
DZ1
1N5244
14V
C1 Nichicon UPL1V151MPH, ESR = 0.12Ω
C2 Nichicon UPL1C331MPH, ESR = 0.12Ω
D1 Motorola 1N5819
0.01µF
D2 Motorola 1N5819
VIN
D3 Motorola 1N4148
L1 Coiltronics PL52B-68-500, DCR = 0.095Ω
8
U2B
5
R1 KRL
Q1 Siliconix
SP-1-A1-0R100J
VN2222LL
1/2 LM358
Q1
VN2222LL
7
V
V
/ 0.9
2.5V
6
IN min
BATT
4
1.23V R2
R4 R1
I
OUT
R4
1.21k
1%
Figure 18. 1A Battery Charger (2–8 Cells)
4-114
April 1998•
MIC4575
Micrel
U1
10 ft Wire
VOUT
5V/1A
VIN
8V to 24V
0.5 Ω
L1
2
4
1
5
VSW
+V
VIN
SD
68µH
C2
D1
R1
MIC4575BT
68µF
63V
MBR160
30Ω
C1
68µF
63V
FB
+VSENSE
GND
R2
C3
0.01µF
3.01k
1%
3
C4
220µF
10V
R3
1.00k
1%
–VSENSE
R4
10Ω
C1 Nichicon UPL1J680MPH, ESR = 0.17Ω
C2 Nichicon UPL1J680MPH, ESR = 0.17Ω
C4 AVX
TPSE227M010R0100, ESR = 0.1 Ω
–V
D1 Motorola MBRS160
L1 Coiltronics PL52B-68-500, DCR = 0.095Ω
Figure 19. Remote-Sensing Regulator
C2
68µF
VOUT
12V/100mA
T1
150µH
Q1
Si9435
5
1
2
4
SHDN
SW
FB
2
1
R2
D3
1N4148
C5
3300pF
MIC4575BU
13.0k
1%
VIN
6V to 18V
VIN
C3
68µF
20V
GND
3
3
4
C1
22µF
35V
R1
1.50K
1%
D1
T1
MBRS130LT3
4
C4
68µF
20V
C1 AVX
C2 AVX
C3 AVX
C4 AVX
TPSE226M035R0300, ESR = 0.3Ω
TPSE686M020R0150, ESR = 0.15Ω
TPSE686M020R0150, ESR = 0.15Ω
TPSE686M020R0150, ESR = 0.15Ω
R3
1k
D2
–VOUT
–12V/100mA
(–11V to –12V)
D1 Motorola MBRS130LT3
MBRS130LT3
D2 Motorola MBRS130LT3
T1 Coiltronics CTX150-4, DCR = 0.372Ω
Q1 Siliconix
Si 9435, PMOS
Figure 20. 6V–18V to Split ±12V/100mA Supply
U1
L1
68µH
D2
IOUT
1A
1N5819
5
1
2
SHDN
SW
FB
D1
1N5819
VBATT
2–8 Cells
C2
VIN
8V to 24V
MIC4575BU
C3
0.1µF
330µF
16V
4
VIN
GND
C1
150µF
35V
3
R1
0.1Ω
R2
R3
113k
1%
10k
1%
VIN
DZ1
1N5244
14V
C4
0.01µF
8
4
6
5
7
R4
U2B
1/2 LM358
10k
U1 Micrel
MIC4575BT
LM358
V
BATT
U2 National
V
=
+ 2.5V
R2
IN min
0.9
C1 Nichicon UPL1V151MPH, ESR = 0.12Ω
C2 Nichicon UPL1C331MPH, ESR = 0.12Ω
D1 Motorola 1N5819
1.23V
D2 Motorola 1N5819
I
=
OUT
R1
R2
R3
DZ1 Motorola 1N5244
L1 Bi
R1 KRL
HM77-11003, DCR = 0.233Ω
SP-1/2-A1-0R100J
Figure 21. 1A Battery Charger
April 1998•
4-115
MIC4575
Micrel
VOUT
0V–12V
U1
L1
68µH
V
OUTmin = 60mV
5
1
2
4
SHDN
SW
FB
D1
1N5819
C2
1000µF
16V
R6
330Ω
0.5W
R1
20k
1%
VIN
4V to 24V
C3
3300pF
MIC4575BT
VIN
GND
C1
150µF
35V
3
VIN
R2
2k
1%
C4
0.01µF
5
U2A
2
8
7
U2B
1/2LM3586
1
3
4
R6
220Ω
1/2LM358
R3
R4
20k
1%
2k
1%
R5
10K
V
OUT
V
=
+ 2.5V
U1 Micrel
U2 National
MIC4575BT
LM358
IN min
0.9
R1
R
C1 Nichicon UPL1V151MPH, ESR = 0.12Ω
C2 Nichicon UPL1C102MPH, ESR = 0.047Ω
D1 Motorola 1N5819
V
= 1.23V
OUT max
L1 Bi
HM77-11003, DCR = 0.233Ω
R1 = R3 and R2 = R4
Figure 22. Improved Adjustable Output-Voltage Regulator (0V–12V)
D3
IOUT
1A
U1
1N4148
R1
L1
0.1Ω
5
1
2
4
SHDN
SW
D1
1N5819
68µH
C2
330µF
16V
VIN
8V to 24V
MIC4575BT
R5
3k
R2
100Ω
1%
VIN
FB
GND
3
U2A
1/2LM358
C1
150µF
35V
R6
1k
C4
3
2
1000pF
1
R3
10k
C3
VIN
0.01µF
DZ1
1N5236
7.5V
C5
0.01µF
R7
100k
5
R8
100k
8
4
7
Q1
VN2222LL
U2B
1/2 LM358
7
U3
6
2
3
IN
FLG A
8
Bat A
Bat B
OUT A
R10
510k
U1 Micrel
U2 National
U3 Micrel
MIC4575BT
LM358
FLG B
CTL A
R4
1.21k
1%
MIC2506
1
4
5
MIC2506BM
OUT B
2
1
C1 Nichicon UPL1V151MPH, ESR = 0.12Ω
C1 Nichicon UPL1C331MPH, ESR = 0.12Ω
D1 Motorola 1N5819
GND
6
CTL B
A/B
U4A
D2 Motorola 1N5819
7404
Bat B
4 Cells
NiCad
Bat A
4 Cells
NiCad
R9
510k
DZ1 Motorala 1N5236
L1 Bi
HM77-11003, DCR = 0.233Ω
VN2222LL
SP-1/2-A1-0R100J
Q1 Siliconix
R1 KRL
Figure 23. Switchable Battery-Pack Charger
4-116
April 1998•
MIC4575
Micrel
D3
IOUT
1A
D2
U1
1N4148
R1
1N5819
L1
0.1Ω
5
1
2
4
SHDN
SW
FB
D1
1N5819
68µH
VBATT
2 Li Cells
C2
VIN
12V to 24V
MIC4575BT
R6
3k
330µF
16V
R2
100Ω
1%
VIN
GND
3
U2A
1/2LM358
R5
C1
150µF
35V
R7
1k
1.0k
1%
C4
3
2
1000pF
1
U1 Micrel
MIC4575BT
LM358
C3
VIN
U2 National
U3 National
U4 National
0.01µF
LM3420
LM339
C5
0.1µF
C1 Nichicon UPL1V151MPH, ESR = 0.12Ω
C1 Nichicon UPL1C331MPH, ESR = 0.12Ω
D1 Motorola 1N5819
5
8
4
7
Q1
U2B
1/2 LM358
D2 Motorola 1N5819
DZ1 Motorala 1N5244
VN2222LL
6
L1 Bi
R1 KRL
Q1 Siliconix
HM77-11003, DCR = 0.233Ω
SP-1/2-A1-0R100J
VN2222LL
8
U3
COMP
IN
3
R3
1.21k
1%
VIN
C8
1.24V
R2
R1
LM3420
0.01µF
IOUT
=
R3
1
R8
10k
R10
10k
Q2
2N2222
OUT
R9
GND
10M
4
IOUT = 1.02A
VIN
C7
0.01µF
R12
100k
R4
13.0k
1%
V
BATT
C6
4
V
>
=
+ 2.5V
R2
IN min
0.1µF
3
7
6
0.9
1
END
IOUTEND
IOUTEND
60mA
1.23V
12
LM339
R
R
–
3
R1
Figure 24. Lithium-Ion Battery Charger with End-of-Charge Flag
L1
L2
U1
U2
VIN
VOUT
5V/1A
6.0V
68µH
1µH
1
3
5
1
2
4
VOUT
MIC29150
SHDN
SW
FB
R2
C3
3300pF
MIC4575BU
VIN
9V to 18V
3.92k
1%
GND
2
VIN
C2
C3
100µF
10V
C4
22µF
10V
GND
3
220µF
10V
C1
22µF
35V
R1
1.00k
1%
D1
MBRS130LT3
U1 Micrel
U2 Micrel
C1 AVX
C2 AVX
C3 AVX
MIC4575BU
MIC29150-5.0BU
TPSE226M035R0300, ESR = 0.3Ω
TPSE227M010R0100, ESR = 0.1Ω
TPSE106M010R0200, ESR = 0.2Ω
R
R
V
= 1.23
+
OUT
C4 Sprague 293D226X0010C2W
D1 Motorola MBRS130LT3
D2 Motorola MBRS130LT3
L1 Bi
L2 Coilcraft
HM77-11003, DCR = 0.233Ω
D016087C-102, DCR = 0.05Ω
Figure 25. Low Output-Noise Regulator (<1mV)
April 1998•
4-117
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