Micrel MIC4575-5.0BT 200khz simple 1a buck voltage regulator Datasheet

MIC4575
Micrel
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.
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.
• 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.
• Thermal shutdown
• Overcurrent protection
• 100% electrical thermal limit burn-in
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 200µA
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.
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
Typical Applications
L1
Shutdown
Enable
5
8V to 24V
SHDN
2
SW
MIC4575-5.0BT
FB
VIN
GND
1
C1
150µF
35V
5.0V/1A
68µH
4
D1
1N5819
3
C2
330µF
16V
Fixed Regulator
Shutdown
Enable
5
6V to 24V
1
C1
22µF
35V
SHDN
SW
MIC4575BU
FB
VIN
2
L1
68µH
4
GND
3
D1
3.6V/1A
R2
2.37k
1%
R1
1.24k
1%
C3
3300pF
C2
330µF
6.3V
MBRS130LT3
Adjustable Regulator
4-106
April 1998•
MIC4575
Micrel
Ordering Information
Part Number
Voltage
Temperature Range
Package
MIC4575-3.3BT
3.3V
–40°C to +85°C
5-lead TO-220
MIC4575-5.0BT
5.0V
–40°C to +85°C
5-lead TO-220
Adjustable
–40°C to +85°C
5-lead TO-220
3.3V
–40°C to +85°C
5-lead TO-263
5.0V
–40°C to +85°C
5-lead TO-263
Adjustable
–40°C to +85°C
5-lead TO-263
MIC4575BT
MIC4575-3.3BU
MIC4575-5.0BU
MIC4575BU
Pin Configuration
TAB
5
4
3
2
1
SHDN
FB
GND
SW
VIN
5-Lead TO-220 (T)
TAB
5
4
3
2
1
4
SHDN
FB
GND
SW
VIN
5-Lead TO-263 (U)
Pin Description
Pin Number
Pin Name
1
VIN
Supply Voltage (Input): Unregulated +4V to +40V supply voltage.
2
SW
Switch (Output): Emitter of NPN output switch. Connect to external storage
inductor and Shottky diode.
3, TAB
GND
4
FB
5
SHDN
April 1998•
Pin Function
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.
4-107
MIC4575
Micrel
Absolute Maximum Ratings
Operating Ratings
Supply Voltage (VIN) Note 1 ....................................... +40V
Shutdown Voltage (VSHDN) .......................... –0.3V to +36V
Output Switch (VSW) steady state ................................. –1V
Storage Temperature (TS) ......................... –65°C to 150°C
Supply Voltage (VIN) ................................................... +24V
Junction Temperature ............................................. +150°C
Package Thermal Resistance
TO-220, TO-263 (θJA) ......................................... 65°C/W
TO-220, TO-263 (θJA) ........................................... 2°C/W
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
1.217
1.230
1.243
V
1.193
1.180
1.230
1.267
1.280
V
V
MIC4575 [Adjustable]
Feedback Voltage
Feedback Voltage
8V ≤ VIN ≤ 24V, 0.2A ≤ ILOAD ≤ 1A
Efficiency
ILOAD = 1A, VOUT = 5V
77
Feedback Bias Current
%
50
100
500
nA
nA
3.234
3.3
3.366
V
3.168
3.135
3.3
3.432
3.465
V
V
MIC4575-3.3
Output Voltage
Output Voltage
6V ≤ VIN ≤ 24V, 0.2A ≤ ILOAD ≤ 1A
Efficiency
ILOAD = 1A
72
%
MIC4575-5.0
Output Voltage
Output Voltage
8V ≤ VIN ≤ 24V, 0.2A ≤ ILOAD ≤ 1A
Efficiency
ILOAD = 1A
4.900
5.0
5.100
V
4.800
4.750
5.0
5.200
5.250
V
V
77
%
MIC4575 / -3.3 / -5.0
Oscillator Frequency
180
200
220
kHz
1
1.3
1.5
V
V
Saturation Voltage
IOUT = 1A
Maximum Duty Cycle (On)
FB connected to 0V
90
95
Current Limit
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
Output = –1V
0
7.5
2
30
mA
mA
5
10
mA
50
200
µA
Quiescent Current
Standby Quiescent Current
SHDN = 5V (regulator off)
SHDN Input Logic Level
VOUT = 0V (regulator off)
2.2
2.4
VOUT = 3.3 or 5V (regulator on)
SHDN Input Current
SHDN = 5V (regulator off)
SHDN = 0V (regulator on)
–10
%
1.4
V
V
1.2
1.0
0.8
V
V
4
0.01
30
10
µA
µA
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
SHDN
CIN
Internal
Regulator
Thermal
Shutdown
200kHz
Oscillator
Current
Limit
Driver
Comparator
L1
SW
VOUT
1A
Switch
D1
COUT
1.23V
Bandgap
Error
Amp.
R1
FB
R2
MIC4575-x.x
GND
4
Block Diagram with External Components
Fixed Step-Down Regulator
+24V max.
VIN
Shutdown
Enable
SHDN
CIN
Internal
Regulator
Thermal
Shutdown
200kHz
Oscillator
VOUT
Current
Limit
R1
Comparator
Driver
V REF
R2
R1
+ 1
R2
VOUT
VREF
1
L1
SW
VOUT
1A
Switch
D1
COUT
Error
Amp.
1.23V
Bandgap
R1
FB
MIC4575 [Adjustable]
GND
Block Diagram with External Components
Adjustable Step-Down Regulator
April 1998•
4-109
R2
MIC4575
Micrel
Functional Description
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
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 50µA.
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.
Feedback
Fixed versions of the regulator have an internal resistive
divider from the feedback (FB) pin. Connect FB directly to the
output line.
Output Capacitor
External output capacitor COUT provides stabilization and
reduces ripple.
Return Paths
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.
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
6V to 24V
C1
150µF
35V
1
SHDN
SW
MIC4575-3.3BT
VIN
FB
GND
3
C1
C2
D1
L1
L1
Nichicon
Nichicon
Motorola
Sumida
Bi
For a mathematical approach to component selection and
circuit design, refer to Application Note 14.
L1
3.3V/1A
2
5
68µH
8V to 24V
C2
330µF
16V
4
D1
1N5819
C1
150µF
35V
UPL1V151MPH, ESR = 0.12Ω
UPL1C331MPH, ESR = 0.12Ω
1N5819
RCH106-680K, DCR = 0.22Ω
HM77-11003, DCR = 0.233Ω, Note 2
5
1
C1
68µF
63V
SHDN
SW
FB
VIN
2
L1
150µH
4
GND
MBR160
3
C1
C2
D1
L1
Nichicon
Nichicon
Motorola
Sumida
MIC4575-5.0BT
VIN
FB
GND
Nichicon
Nichicon
Motorola
Sumida
Bi
2
5.0V/1A
68µH
4
D1
1N5819
C2
330µF
16V
UPL1J151MPH, ESR = 0.12Ω
UPL1C331MPH, ESR = 0.12Ω
1N5819
RCH106-680K, DCR = 0.22Ω
HM77-11003, DCR = 0.233Ω, Note 2
Figure 2. 8V–24V to 5V/1A Buck Converter
Through Hole
MIC4575BT
16V to 24V
SW
3
C1
C2
D1
L1
L2
Figure 1. 6V–24V to 3.3V/1A Buck Converter
Through Hole
1
SHDN
12V/1A
R2
13.0k
1%
R1
1.50k
1%
C2
330µF
16V
UPL1J680MPH, ESR = 0.17Ω
UPL1C331MPH, ESR = 0.12Ω
MBR160
RCH110-151K, DCR = 0.23Ω
Note 2: Surfacemount component.
Figure 3. 16V–24V to 12V/1A Buck Converter, Through Hole
4-110
April 1998•
MIC4575
Micrel
5
6V to 24V
SHDN
SW
MIC4575BU
1
VIN
FB
C1
22µF
35V
L1
2
4
GND
C3
3300pF
5
6V to 24V
C2
330µF
6.3V
R1
1.50k
1%
D1
3
L1
3.3V/1A
R2
2.49k
1%
68µH
1
C1
150µF
35V
SHDN
SW
MIC4575-3.3BU
VIN
FB
GND
3.3V/1A
2
68µH
4
D1
MBRS130LT3
3
C2
470µF
16V
MBRS130LT3
C1
C2
D1
L1
AVX
AVX
Motorola
Coiltronics
TPSE226M035R0300, ESR = 0.3Ω
TPSE337M006R0100, ESR = 0.1Ω
MBRS130LT3
CTX68-4P, DCR = 0.238Ω
C1
C2
D1
L1
L1
Figure 4. 6V–24V to 3.3V/1A Buck Converter
Low-Profile Surface Mount
5
8V to 24V
SHDN
SW
MIC4575BU
1
FB
VIN
C1
22µF
35V
L1
2
4
GND
Figure 7. 6V–24V to 3.3V/1A Buck Converter
Lower-Cost Surface Mount
D1
L1
5
C3
3300pF
C2
220µF
10V
8V to 24V
AVX
AVX
Motorola
Coiltronics
TPSE226M035R0300, ESR = 0.3Ω
TPSE227M010R0100, ESR = 0.1Ω
MBRS130LT3
CTX68-4P, DCR = 0.238Ω
16V to 24V
1
C1
10µF
50V
SHDN
SW
MIC4575BU
FB
VIN
GND
3
C1
C2
D1
L1
2
L1
150µH
4
C3
3300pF
5
1
5
Sanyo
Sanyo
Motorola
Coilcraft
Bi
68µH
4
D1
MBRS130LT3
C2
470µF
16V
35CV150GX, ESR = 0.17Ω
16CV470GX, ESR = 0.17Ω
MBRS130LT3
DO3316P-683, DCR = 0.16Ω
HM77-11003, DCR = 0.233Ω
SHDN
SW
FB
VIN
3
4
2
L1
150µH
4
SS26
12V/1A
R2
13.0k
1%
R1
1.50k
1%
C2
470µF
16V
Nichicon UUX1H470MT1GS, ESR = 0.4Ω
Sanyo
16CV470GX, ESR = 0.17Ω
General Instruments SS26
Coiltcraft DO5022P-154, DCR = 0.218Ω
Figure 9. 16V–24V to 12V/1A Buck Converter
Lower-Cost Surface Mount
VIN
SW
MIC4575-5.0BT
SHDN
FB
GND
2
4
L1
10µH
3
C1 Nichicon
UPL1V151MPH
ESR = 0.13Ω
C2 Nichicon UPL1C681MPH
ESR = 0.065Ω
D1 Motorola 1N5819
L1 Coiltronics PL52A-10-500
DCR = 0.045Ω
D1
1N5819
C2
680µF
16V
-5V/0.2A
Figure 10. 8V–18V to –5V/0.2A Buck-Boost Converter
Through Hole
April 1998•
5V/1A
2
GND
C1
C2
D1
L1
Figure 6. 16V–24V to 12V/1A Buck Converter
Low-Profile Surface Mount
C1
150µF
35V
1
C1
47µF
50V
X2
Tokin
C55YU1H106Z
AVX
TPSE686M020R0150, ESR = 0.15Ω
General Instruments SS26
Coiltronics CTX150-4, DCR = 0.372Ω
8V to 18V
MIC4575-5.0BU
FB
VIN
GND
MIC4575BU
16V to 24V
C2
68µF
20V
R1
1.50k
1%
D1
SS26
SW
Figure 8. 8V–24V to 5V/1A Buck Converter
Lower-Cost Surface Mount
12V/1A
R2
13.0k
1%
SHDN
3
C1
C2
D1
L1
L1
Figure 5. 8V–24V to 5V/1A Buck Converter
Low-Profile Surface Mount
5
1
C1
150µF
35V
MBRS130LT3
C1
C2
D1
L1
35CV150GX, ESR = 0.17Ω
16CV470GX, ESR = 0.17Ω
MBRS130LT3
DO3316P-683, DCR = 0.16Ω
HM77-11003, DCR = 0.233Ω
5V/1A
R2
3.01k
1%
R1
1.00k
1%
68µH
3
Sanyo
Sanyo
Motorola
Coilcraft
Bi
4-111
MIC4575
Micrel
4.75V to 5.25V
1
5
C1
150µF
35V
VIN
2
SW
MIC4575BT
SHDN
FB
GND
C4
1000pF
4
L1
15µH
R4
5.1K
3
R1
3.01k
1%
R2
1.00K
1%
C1
C2
D1
L1
Nichicon
Nichicon
Motorola
Coiltronics
C2
680µF
16V
D1
R3
10K
C3
0.01µF
-5V/0.3A
1N5819
UPL1V151MPH, ESR = 0.12Ω
UPL1C681MPH, ESR = 0.065Ω
1N5819
PL52A-15-500, DCR = 0.054Ω
Figure 11. 5V to –5V/0.3A Buck-Boost Converter
Through Hole
5
VIN
8V to 18V
SHDN
SW
2
4
4
1
MIC4575BU
1
FB
VIN
C1
22µF
35V
GND
AVX
AVX
AVX
Motorola
Coiltronics
Coilcraft
VOUT
5V/1A
L1
3
1µH
R2
3.01k
1%
C4
220µF
10V
R1
1.00K
1%
2
D1
MBRS130LT3
3
C1
C2
C4
D1
T1
L1
T1
68µH
C3
3300pF
5mVP-P
C2
220µF
10V
TPSE226M035R0300, ESR = 0.3Ω
TPSE227M010R0100, ESR = 0.1Ω
TPSE227M010R0100, ESR = 0.1Ω
MBRS130LT3
CTX68-4P, DCR = 0.238Ω
DO1608C-102
Figure 12. Low Output-Noise Regulator (5mV Output Ripple )
5
VIN
8V to 18V
SHDN
SW
2
2
T1
68µH
R2
3.01k
1%
R1
1.00K
1%
MIC4575BU
1
C1
22µF
35V
VIN
FB
4
GND
3
+VOUT/+IOUT
5V/0.5A
1
D1
MBRS130LT3
C3
3300pF
C2
220µF
10V
4
C5
220µF
10V
C4
220µF
10V
L1
D2
MBRS130LT3
3
+IOUT + IOUT
C1
C2
C4
C5
D1
D2
T1
AVX
AVX
AVX
AVX
Motorola
Motorola
Coiltronics
TPSE226M035R0300, ESR = 0.3Ω
TPSE227M010R0100, ESR = 0.1Ω
TPSE227M010R0100, ESR = 0.1Ω
TPSE227M010R0100, ESR = 0.1Ω
MBRS130LT3
MBRS130LT3
CTX68-4P, DCR = 0.238Ω
DC
-VOUT/-IOUT
-5V/0.5A
at VIN ≥15V
Load Regulation≈±5%
1A
+VOUT 0.5V
VIN 0.5V
DC
40% then
IOUT
+IOUT
DC
40% then
IOUT
IOUT
(1
DC)
Figure 13. Split ±5V Supply
4-112
April 1998•
MIC4575
Micrel
Q1
2N4339
R3
3.3K
5
VIN
4V to 24V
SHDN
SW
68µH
MIC4575BT
1
FB
VIN
C1
150µF
35V
D1
1N5819
3
Nichicon
Nichicon
Motorola
Coiltronics
Micrel
R1
200K
4
GND
C1
C2
D1
L1
U2
U2
LM4041CIZ-1.2 VOUT
(0-12V)/0.5A
VOUT Min = 60mV
R4
C2
330µF 330Ω
0.5W
16V
L1
2
R2
15k
UPL1V151MPH, ESR = 0.12Ω
UPL1C331MPH, ESR = 0.12Ω
1N5819
PL52B-68-500, DCR = 0.095Ω
LM4041CIZ-1.2
VIN min
VOUT
0.9
VIN min
VOUT
1.5V
and
2.5V
Figure 14. Adjustable (0V–12V) Output-Voltage Regulator
U1
5
VIN
4V to 15V
SHDN
SW
L1
68µH
2
VOUT
1V/1A
3
MIC4575BT
1
VIN
FB
4
1
GND
2
U2
LM358
3
C1
150µF
35V
D1
1N5819
C1
C2
D1
L1
U2
R1
R2
249Ω
1%
1.00k
1%
4
C2
330µF
16V
R3
1k
Nichicon UPL1V151MPH, ESR = 0.12Ω
Nichicon UPL1C331MPH, ESR = 0.12Ω
Motorola 1N5819
Coiltronics PL52B-68-500, DCR = 0.095Ω
National LM358
Figure 15. Low Output-Voltage Regulator (1V)
5
VIN
9V to 24V
SHDN
Nichicon
Nichicon
Motorola
Coiltronics
National
Siliconix
KRL
VIN min
IOUT
FB
VIN
68µH
3
UPL1V151MPH, ESR = 0.12Ω
UPL1C331MPH, ESR = 0.12Ω
1N5819
PL52B-68-500, DCR = 0.095Ω
LM358
VN2222LL
SP-1/2-A1-0R250J
2.5V
R2
R1
D2
1N5819
R1
0.25Ω
R2
200Ω
1%
4
GND
VBATT
0.9
1.23V
R5
L1
MIC4575BT
1
C1
150µF
35V
C1
C2
D1
L1
U2
Q1
R1
SW
2
D1
1N5819
U2
LM358
Q1
VN2222LL
R3
10K
3
1
2
C3
C4
1000pF
0.01µF
R4
3k
R5
1.00k
1%
Figure 16. 1A Battery Charger (6–8 cells)
April 1998•
C2
330µF
16V
4-113
DZ1
1N5244
14V
IOUT
1A
6-8 Cells
VBATT
MIC4575
Micrel
D3
1N4148
5
VIN
8V to 24V
SHDN
MIC4575-BT
FB
VIN
GND
1
C2
330µF
16V
R2
100Ω
1%
C4
1000pF
MIC4575BT
LM358
LM4041CIZ-1.2
UPL1V151MPH, ESR = 0.12Ω
UPL1C331MPH, ESR = 0.12Ω
1N5819
1N5819
1N4148
PL52B-68-500, DCR = 0.095Ω
SP-1-A1-0R100J
VN2222LL
VBATT / 0.9
1
2
U2A
1/2LM358
R3
10k
VIN
U2B
1/2 LM358
8
C3
5
7
0.01µF
Q1
VN2222LL
DZ1
1N5244
14V
IOUT
0.1A to 1A
2-8 Cells
VBATT
VIN
3
R7
1k
Micrel
National
Micrel
Nichicon
Nichicon
Motorola
Motorola
Motorola
Coiltronics
KRL
Siliconix
VIN min
D2
1N5819
R1
0.1Ω
D1
1N5819
R6
3k
4
3
C1
150µF
35V
U1
U2
U3
C1
C2
D1
D2
D3
L1
R1
Q1
SW
L1
68µH
2
R5
10k
VR1
10k
U3
LM4041CIZ-1.2
6
4
R4
1.21k
1%
2.5V
Figure 17. 0.1A–1A Variable-Current Battery Charger
D3
1N4148
5
VIN
8V to 24V
SHDN
SW
FB
VIN
GND
3
C1
150µF
35V
D1
1N5819
R5
3k
4
R6
1k
D2
1N5819
R1
0.1Ω
2
MIC4575-BT
1
L1
68µH
C2
330µF
16V
R2
100Ω
1%
C4
1000pF
IOUT
1A
2-8 Cells
VBATT
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
VIN min
IOUT
MIC4575BT
LM358
UPL1V151MPH, ESR = 0.12Ω
UPL1C331MPH, ESR = 0.12Ω
1N5819
1N5819
1N4148
PL52B-68-500, DCR = 0.095Ω
SP-1-A1-0R100J
VN2222LL
VBATT / 0.9
1.23V
R4
2.5V
0.01µF
DZ1
1N5244
14V
VIN
8
5
U2B
1/2 LM358
7
6
Q1
VN2222LL
4
R2
R1
R4
1.21k
1%
Figure 18. 1A Battery Charger (2–8 Cells)
4-114
April 1998•
MIC4575
Micrel
U1
VIN
8V to 24V
1
VSW
VIN
MIC4575BT
5
C1
68µF
63V
FB
SD
68µH
D1
MBR160
4
GND
3
C2
68µF
63V
R1
30Ω
C3
0.01µF
R2
3.01k
1%
+VSENSE
R3
1.00k
1%
C1
C2
C4
D1
L1
Nichicon
Nichicon
AVX
Motorola
Coiltronics
VOUT
5V/1A
10 ft Wire
0.5 Ω
+V
L1
2
C4
220µF
10V
–VSENSE
R4
10Ω
UPL1J680MPH, ESR = 0.17Ω
UPL1J680MPH, ESR = 0.17Ω
TPSE227M010R0100, ESR = 0.1 Ω
MBRS160
PL52B-68-500, DCR = 0.095Ω
–V
Figure 19. Remote-Sensing Regulator
5
VIN
6V to 18V
SHDN
SW
VIN
FB
GND
C1
22µF
35V
VOUT
12V/100mA
T1
150µH
2
1
R2
13.0k
1%
D3
1N4148
MIC4575BU
1
C2
68µF
Q1
Si9435
2
4
C5
3300pF
C3
68µF
20V
3
3
D1
MBRS130LT3
T1
R1
1.50K
1%
4
C1
C2
C3
C4
D1
D2
T1
Q1
AVX
AVX
AVX
AVX
Motorola
Motorola
Coiltronics
Siliconix
TPSE226M035R0300, ESR = 0.3Ω
TPSE686M020R0150, ESR = 0.15Ω
TPSE686M020R0150, ESR = 0.15Ω
TPSE686M020R0150, ESR = 0.15Ω
MBRS130LT3
MBRS130LT3
CTX150-4, DCR = 0.372Ω
Si 9435, PMOS
C4
68µF
20V
R3
1k
D2
–VOUT
–12V/100mA
(–11V to –12V)
MBRS130LT3
Figure 20. 6V–18V to Split ±12V/100mA Supply
L1
68µH
U1
5
VIN
8V to 24V
C1
150µF
35V
SHDN
SW
D1
1N5819
MIC4575BU
1
VIN
GND
FB
D2
1N5819
2
C2
330µF
16V
C3
0.1µF
4
3
VIN
C4
R3
R2
113k
1%
10k
1%
R1
0.1Ω
DZ1
1N5244
14V
0.01µF
8
8
7
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 = 0.12Ω
UPL1C331MPH, ESR = 0.12Ω
1N5819
1N5819
1N5244
HM77-11003, DCR = 0.233Ω
SP-1/2-A1-0R100J
6
R4
5
4
10k
=
IOUT =
1.23V
R1
Figure 21. 1A Battery Charger
April 1998•
4-115
VBATT
+ 2.5V
0.9
VIN min
R2
R2
R3
IOUT
1A
VBATT
2–8 Cells
4
MIC4575
Micrel
U1
5
VIN
4V to 24V
SHDN
SW
2
FB
4
D1
1N5819
MIC4575BT
1
VOUT
0V–12V
VOUTmin = 60mV
L1
68µH
VIN
C1
150µF
35V
GND
3
VIN
5
U2B
1/2LM358
C4
0.01µF
8
1
6
3
4
U1
U2
C1
C2
D1
L1
Micrel
National
Nichicon
Nichicon
Motorola
Bi
R3
R4
20k
1%
2k
1%
R6
330Ω
0.5W
R2
2k
1%
U2A
2
7
C2
1000µF
16V
R1
20k
1%
C3
3300pF
R6
220Ω
1/2LM358
R5
10K
VIN min
MIC4575BT
LM358
UPL1V151MPH, ESR = 0.12Ω
UPL1C102MPH, ESR = 0.047Ω
1N5819
HM77-11003, DCR = 0.233Ω
=
VOUT
+ 2.5V
0.9
VOUT max = 1.23V
R1
R2
1
R1 = R3 and R2 = R4
Figure 22. Improved Adjustable Output-Voltage Regulator (0V–12V)
D3
U1
5
VIN
8V to 24V
C1
150µF
35V
1N4148
SHDN
SW
MIC4575BT
1
VIN
GND
3
FB
D1
1N5819
R5
3k
4
R6
1k
68µH
U2A
1/2LM358
C4
1000pF
C3
0.01µF
C5
0.01µF
5
8
U2B
1/2 LM358
7
C2
330µF
16V
R2
100Ω
1%
3
R3
10k
1
VIN
IOUT
1A
R1
0.1Ω
L1
2
2
DZ1
1N5236
7.5V
Q1
VN2222LL
4
R7
100k
R8
100k
U3
6
2
Bat A
FLG A
7
IN
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 = 0.12Ω
UPL1C331MPH, ESR = 0.12Ω
1N5819
1N5819
1N5236
HM77-11003, DCR = 0.233Ω
VN2222LL
SP-1/2-A1-0R100J
R4
1.21k
1%
Bat B
FLG B
1
A/B
1
2
4
U4A
7404
8
OUT A
3
CTL A
CTL B
MIC2506
OUT B
5
R10
510k
GND
6
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
VIN
12V to 24V
1N4148
SHDN
SW
2
MIC4575BT
1
VIN
FB
GND
C1
150µF
35V
D1
1N5819
R6
3k
4
R7
1k
3
68µH
U2A
1/2LM358
C4
1000pF
IOUT
1A
D2
1N5819
R1
0.1Ω
L1
VBATT
2 Li Cells
C2
330µF
16V
R2
100Ω
1%
R5
1.0k
1%
3
1
U1 Micrel
U2 National
U3 National
U4 National
C1 Nichicon
C1 Nichicon
D1 Motorola
D2 Motorola
DZ1 Motorala
L1 Bi
R1 KRL
Q1 Siliconix
MIC4575BT
LM358
LM3420
LM339
UPL1V151MPH, ESR = 0.12Ω
UPL1C331MPH, ESR = 0.12Ω
1N5819
1N5819
1N5244
HM77-11003, DCR = 0.233Ω
SP-1/2-A1-0R100J
VN2222LL
8
IOUTEND
IOUTEND
Q1
VN2222LL
7
U2B
1/2 LM358
4
6
U3
3
VIN
R8
10k
R10
10k
R9
10M
R3
1.21k
1%
C8
0.01µF
Q2
2N2222
8
COMP
IN
LM3420
1
OUT
GND
4
IOUT = 1.02A
VIN min > =
2
C5
0.1µF
5
R2
R1
1.24V
IOUT =
R3
C3
0.01µF
VIN
VIN
VBATT
+ 2.5V
0.9
C6
0.1µF
1.23V
3
R12
100k
R4
13.0k
1%
4
7
1
END
60mA
C7
0.01µF
6
12
R5
R2
–
R4
R3
R1
LM339
Figure 24. Lithium-Ion Battery Charger with End-of-Charge Flag
L1
68µH
U1
5
VIN
9V to 18V
SHDN
R2
3.92k
1%
MIC4575BU
1
VIN
C1
22µF
35V
U1
U2
C1
C2
C3
C4
D1
D2
L1
L2
SW
GND
3
Micrel
Micrel
AVX
AVX
AVX
Sprague
Motorola
Motorola
Bi
Coilcraft
FB
L2
1µH
6.0V
U2
1
2
4
D1
MBRS130LT3
MIC4575BU
MIC29150-5.0BU
TPSE226M035R0300, ESR = 0.3Ω
TPSE227M010R0100, ESR = 0.1Ω
TPSE106M010R0200, ESR = 0.2Ω
293D226X0010C2W
MBRS130LT3
MBRS130LT3
HM77-11003, DCR = 0.233Ω
D016087C-102, DCR = 0.05Ω
C2
220µF
10V
VOUT = 1.23
C3
100µF
10V
1+
R2
R1
Figure 25. Low Output-Noise Regulator (<1mV)
April 1998•
4-117
VIN
3
VOUT
5V/1A
MIC29150
C3
3300pF
R1
1.00k
1%
VOUT
GND
2
C4
22µF
10V
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