ETC MAX5089

19-3944; Rev 1; 5/06
ৰ‫ۇ‬
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PINPACKAGE
PKG
CODE
PART
TEMP RANGE
MAX5088ATE+
-40°C to +125°C
16 TQFN
T1655-2
MAX5089ATE+
-40°C to +125°C
16 TQFN
T1655-2
+ ‫ܭ‬ာᇄ໺ॖᓤă
SOURCE
PGND
SGND
CKO
``````````````````````````````` ፛୭๼ᒙ
12
11
10
9
TOP VIEW
FEATURES
MAX5088ATE
Nonsynchronous
Buck
RESET Output,
Clock Output
Synchronous Buck
PGOOD Output,
Synchronous FET
Driver
RESET 14
7
V+
6
BYPASS
5
OSC
MAX5088
BST/VDD 15
EN 16
+ EP*
1
DRAIN
MAX5089ATE
VL
፛୭๼ᒙ)ኚ*Ᏼၫ௣ᓾ೯ࡼᔢઁ৊߲ă
*EXPOSED PAD.
2
3
4
FB
CONFIGURATION
8
COMP
PART
SYNC 13
DRAIN
``````````````````````````````` ኡቯᒎฉ
THIN QFN
5mm x 5mm
________________________________________________________________ Maxim Integrated Products
1
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NBY61990NBY619:
3/3NI{Ă3Bଢ଼ኹቯᓞધ໭ดᒙ঱‫ܟ‬ఎਈ
ABSOLUTE MAXIMUM RATINGS
RESET, PGOOD to SGND ........................................-0.3V to +6V
BYPASS to SGND..................................................-0.3V to +2.2V
VL and BYPASS Short-Circuit Duration to SGND ......Continuous
Continuous Power Dissipation* (TA = +70°C)
16-Pin TQFN (derate 33mW/°C above +70°C) ..........2666mW
Package Thermal Resistance (junction to case) ............1.7°C/W
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature Range ............................-65°C to +150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
V+ to PGND............................................................-0.3V to +25V
BST/VDD, DRAIN to SGND ....................................-0.3V to +30V
SGND to PGND .....................................................-0.3V to +0.3V
BST/VDD to SOURCE...............................................-0.3V to +6V
SOURCE to SGND..................................................-0.6V to +25V
SOURCE or DRAIN Maximum Peak Current...............5A for 1ms
VL to SGND ................-0.3V to the lower of +6V and (V+ + 0.3V)
SYNC, EN, DL, CKO, OSC, COMP,
FB to SGND...............................................-0.3V to (VL + 0.3V)
BYPASS, CKO, OSC, COMP, FB, EN, SYNC, RESET,
PGOOD Maximum Input Current .................................±50mA
*As per JEDEC51 Standard (multilayer board).
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V+ = VL = 5V or V+ = 5.5V to 23V, VEN = 5V, TA = TJ = -40°C to +125°C, unless otherwise noted. Circuits of Figures 5 and 6. Typical
values are at TA = TJ = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
5.5
23.0
V
4.5
5.5
V
1.8
2.5
mA
V+ = 12V, VEN = 0V, PGOOD (MAX5089),
RESET, CKO unconnected (MAX5088),
ROSC = 10kΩ
1
1.4
mA
Nonsynchronous (MAX5088),
fSW = 1.25MHz, V+ = 12V, IOUT = 1.5A,
VOUT = 3.3V
79
SYSTEM SPECIFICATIONS
Input Voltage Range
V+
V+ Operating Supply Current
IQ
V+ Standby Supply Current
Efficiency
ISTBY
η
V+ = VL
V+ = 12V, VFB = 0.8V
ROSC = 10kΩ, no switching
%
Synchronous (MAX5089),
fSW = 300kHz, V+ = 12V, IOUT = 1.5A,
VOUT = 3.3V
90
VL REGULATOR (VL)/BYPASS OUTPUT (BYPASS)
VL Undervoltage Lockout
VUVLO
VL Undervoltage Lockout
Hysteresis
VHYST
VL Output Voltage
BYPASS Output Voltage
BYPASS Load Regulation
2
VL
VBYPASS
ΔVBYPASS
VL falling
4.1
4.3
137
V
mV
V+ = 5.5V to 23V, IVL = 0 to 40mA
5.0
5.2
5.5
V
V+ = VL = 5.2V
1.98
2
2.02
V
0
1.2
10
mV
IBYPASS steps from 0 to 50μA,
V+ = VL = 5.2V
_______________________________________________________________________________________
3/3NI{Ă3Bଢ଼ኹቯᓞધ໭ดᒙ঱‫ܟ‬ఎਈ
(V+ = VL = 5V or V+ = 5.5V to 23V, VEN = 5V, TA = TJ = -40°C to +125°C, unless otherwise noted. Circuits of Figures 5 and 6. Typical
values are at TA = TJ = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
SOFT-START
Digital Soft-Start Period
Internal 6-bit DAC
Soft-Start Steps
4096
Clock
periods
64
Steps
ERROR AMPLIFIER (FB and COMP)
FB to COMP Transconductance
gM
1.20
1.8
2.75
mS
250
nA
0.6095
V
FB Input Bias Current
IFB
FB Input Voltage Set Point
VFB
0.5940
0.601
ICOMP
100
150
COMP Sink-and-Source Current
Capability
μA
INTERNAL MOSFETs
On-Resistance n-Channel Power
MOSFET
RON
V+ = VL = 5.2V, ISINK = 100mA
Leakage Current
ILEAK
VEN = 0V, VDRAIN = 23V,
SOURCE = PGND
Minimum Output Current
IOUT
VOUT = 3.3V, V+ = 12V (Note 2)
Current Limit
ILIMIT
On-Resistance Internal Low-Side
Switch
RONLSW
0.150
0.302
Ω
20
μA
2
2.2
ISWITCH = 50mA, V+ = VL = 5.2V
A
2.8
3.5
A
20
38
Ω
SYNCHRONOUS RECTIFIER DRIVER (DL) (MAX5089 Only)
On-Resistance nMOS
RONDLN
ISINK = 0.1A
On-Resistance pMOS
RONDLP
ISOURCE = 0.1A
Peak Sink Current
Peak Source Current
1
6.7
Ω
1.9
11.1
Ω
IIDL_SINK
1
A
IIDL_SOURCE
0.75
A
OSCILLATOR (OSC)/SYNCHRONIZATION (SYNC)/CLOCK OUTPUT (CKO) (MAX5088 Only)
Clock Output-High Level
VCKOH
VL = 5.2V, ISOURCE = 5mA
Clock Output-Low Level
VCKOL
VL = 5.2V, ISINK = 5mA
Switching Frequency
Minimum Controllable On-Time
Maximum Duty Cycle
fSW
V+ = VL = 5.2V
3.54
0.4
ROSC = 5.62kΩ
1900
2100
2400
ROSC = 41.2kΩ
275
312
350
ROSC = 10kΩ
1130
1250
1380
tON_MIN
DMAX
V
120
fSW = 2.2MHz
MAX5088
82
87.5
MAX5089
82
87.5
V
kHz
ns
%
_______________________________________________________________________________________
3
NBY61990NBY619:
ELECTRICAL CHARACTERISTICS (continued)
NBY61990NBY619:
3/3NI{Ă3Bଢ଼ኹቯᓞધ໭ดᒙ঱‫ܟ‬ఎਈ
ELECTRICAL CHARACTERISTICS (continued)
(V+ = VL = 5V or V+ = 5.5V to 23V, VEN = 5V, TA = TJ = -40°C to +125°C, unless otherwise noted. Circuits of Figures 5 and 6. Typical
values are at TA = TJ = +25°C.) (Note 1)
PARAMETER
SYNC Frequency Range
(Note 3)
SYMBOL
CONDITIONS
fSYNC
MIN
TYP
200
MAX
UNITS
2200
kHz
Sync Input to SOURCE RisingEdge Phase Delay (Note 4)
SYNCPHASE
ROSC = 10kΩ, fSYNC = 1.2MHz
65
degrees
Clock Output Phase Delay With
Respect to SOURCE Waveform
(Note 5)
CKOPHASE
ROSC = 10kΩ, SYNC = GND
(MAX5088 only)
115
degrees
SYNC High Threshold
VSYNCH
SYNC Low Threshold
VSYNCL
Minimum SYNC High Pulse Width
tSYNC_H
2.0
V
0.8
100
V
ns
EN, RESET (MAX5088)/PGOOD (MAX5089)
EN Threshold
EN Input Bias Current
VIH
2.0
V
VIL
0.8
IEN
250
nA
RESET Threshold (Note 6)
VTH
VFB = VOUT
90
92.5
95
% VOUT
PGOOD Threshold (Note 6)
VTH
VFB = VOUT
90
92.5
95
% VOUT
FB to RESET or FB to PGOOD
Propagation Delay
tFD
3
RESET Active Timeout Period
tRP
RESET, PGOOD Output Voltage
VOL
RESET, PGOOD Output Leakage
Current
ILEAK
V+ = VL = 5.2V, VRESET or
VPGOOD = 6V, VFB = 0.8V
TSHDN
Temperature rising
140
200
ISINK = 3mA
μs
254
ms
0.4
V
2
μA
THERMAL SHUTDOWN
Thermal Shutdown
Thermal-Shutdown Hysteresis
+170
°C
25
°C
Note 1: 100% tested at +125°C. Limits over temperature are guaranteed by design.
Note 2: Output current may be limited by the power dissipation of the package. See the Power Dissipation section in the Applications
Information section.
Note 3: SYNC input frequency is equal to the switching frequency.
Note 4: From the SYNC rising edge to SOURCE rising edge.
Note 5: From the rising edge of the SOURCE waveform to the rising edge of the CKO waveform.
Note 6: RESET goes high 200ms after VOUT crosses this threshold, PGOOD goes high after VOUT crosses this threshold.
4
_______________________________________________________________________________________
3/3NI{Ă3Bଢ଼ኹቯᓞધ໭ดᒙ঱‫ܟ‬ఎਈ
(V+ = VL = 5.2V, TA = +25°C, Figures 5 and 6, unless otherwise noted.)
MAX5088 BUCK EFFICIENCY vs. OUTPUT
CURRENT (VIN = 12V, fSW = 2.2MHz)
40
30
20
10
50
EFFICIENCY (%)
50
2.5V
50
40
30
40
30
20
20
10
10
0
0
500
1000
1500
2000
0
0
2500
500
1000
1500
2000
0
500
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
90
3.3V
80
2.5V
75
70
80
75
1.2V
3.3V
70
EFFICIENCY (%)
85
1500
2000
2500
MAX5089 SYNCHRONOUS EFFICIENCY vs. OUTPUT
CURRENT (VIN = 12V, fSW = 2.2MHz, L = 4.7μH)
MAX5088/89 toc04
95
1000
OUTPUT CURRENT (mA)
MAX5089 SYNCHRONOUS
EFFICIENCY vs. OUTPUT CURRENT
(VIN = 12V, fSW = 330kHz, L = 15μH)
EFFICIENCY (%)
2500
65
65
60
55
50
45
60
40
55
35
30
50
0
500
1000
1500
2000
0
2500
500
1000
1500
2000
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
MAX5089 OUTPUT VOLTAGE vs. OUTPUT
CURRENT (VIN = 12V, VOUT = 3.3V, fSW = 2.2MHz)
VL OUTPUT VOLTAGE
vs. SWITCHING FREQUENCY
5.190
MAX5088/89 toc06
3.315
3.310
2500
MAX5088/89 toc07
0
3.3V
60
MAX5088/89 toc03
60
EFFICIENCY (%)
2.5V
3.3V
70
60
5.185
VIN = 23V
5.180
3.305
5.175
3.300
VL (V)
OUTPUT VOLTAGE (V)
EFFICIENCY (%)
70
70
MAX5088/89 toc02
3.3V
80
80
MAX5088/89 toc01
90
MAX5088 BUCK EFFICIENCY vs. OUTPUT
CURRENT (VIN = 16V, fSW = 2.2MHz)
MAX5088/89 toc05
MAX5088 BUCK EFFICIENCY vs. OUTPUT
CURRENT (VIN = 5V, fSW = 2.2MHz)
3.295
5.170
VIN = 5.5V
5.165
3.290
5.160
3.285
5.155
5.150
3.280
0
500
1000
1500
OUTPUT CURRENT (mA)
2000
100
600
1100
1600
2100
SWITCHING FREQUENCY (kHz)
_______________________________________________________________________________________
5
NBY61990NBY619:
```````````````````````````````````````````````````````````````````````࢜ቯ৔ᔫᄂቶ
````````````````````````````````````````````````````````````````````࢜ቯ৔ᔫᄂቶ)ኚDž
(V+ = VL = 5.2V, TA = +25°C, Figures 5 and 6, unless otherwise noted.)
FREQUENCY (kHz)
V+ = 5.25V
0.250
0.200
V+ = 5V
0.150
2100
1000
1600
1350
850
0.050
350
1100
1600
0
2100
ROSC = 20kΩ
ROSC = 40kΩ
100
100
600
ROSC = 10kΩ
1100
600
100
ROSC = 6.04kΩ
1850
0.100
0
10
20
30
40
50
60
70
-40
10
60
TEMPERATURE (°C)
RESISTANCE (kΩ)
SWITCHING FREQUENCY (kHz)
MAX5089 LOAD-TRANSIENT RESPONSE
(IOUT = 0.2A TO 1A)
MAX5089 LINE-TRANSIENT RESPONSE
(IOUT = 1A, VIN STEP = 14V TO 21V)
MAX5088/89 toc12
MAX5088/89 toc11
VOUT = 3.3V
VIN
VIN = 12V
VOUT = 3.3V
5V/div
VOUT
100mV/div
0V
200mV/div
VOUT
500mA/div
IOUT
0A
20μs/div
100μs/div
MAX5089 LOAD-TRANSIENT RESPONSE
(IOUT = 0.5A TO 2A)
MAX5089 SOFT-START AND SHUTDOWN
(NO LOAD)
MAX5088/89 toc13
MAX5088/89 toc14
VIN = 12V
VOUT = 3.3V
VOUT
VIN = 12V
200mV/div
1V/div
VOUT
0V
1A/div
IOUT
5V/div
VEN
0A
20μs/div
6
MAX5088/89 toc10
0.300
2350
FREQUENCY (kHz)
V+ = 5.5V
0.350
10,000
MAX5088/89 toc09
MAX5088/89 toc08
0.400
SWITCHING FREQUENCY
vs. TEMPERATURE
SWITCHING FREQUENCY
vs. ROSC
MAX5089 VL DROPOUT VOLTAGE
vs. SWITCHING FREQUENCY
VL DROPOUT VOLTAGE (V)
NBY61990NBY619:
3/3NI{Ă3Bଢ଼ኹቯᓞધ໭ดᒙ঱‫ܟ‬ఎਈ
0V
1ms/div
_______________________________________________________________________________________
110
3/3NI{Ă3Bଢ଼ኹቯᓞધ໭ดᒙ঱‫ܟ‬ఎਈ
MAX5089 SOFT-START AND SHUTDOWN
(IOUT = 2A)
VIN STARTUP WAVEFORM
(EN CONNECTED TO VL)
MAX5088/89 toc15
RESET TIMEOUT
MAX5088/89 toc17
MAX5088/89 toc16
VEN
5V/div
VIN = 12V
VIN
10V/div
VOUT
2V/div
1V/div
VOUT
VEN
VPGOOD
5V/div
0V
5V/div
VEN
5V/div
VOUT
2V/div
5V/div
VRESET
0V
VIN
10V/div
1ms/div
40ms/div
1ms/div
SHUTDOWN CURRENT
vs. TEMPERATURE
MAX5088 EXTERNALLY SYNCHRONIZED
SWITCHING WAVEFORM
MAX5088/89 toc18
MAX5088/89 toc19
500
5V/div
VCLKOUT
5V/div
0V
10V/div
VSOURCE
0V
SHUTDOWN CURRENT (μA)
0V
VSYNC
450
400
350
500mV/div
VOUT
300
-40
100ns/div
SWITCHING SUPPLY CURRENT (ISW)
vs. TEMPERATURE
70
50
40
fSYNC = 1.2MHz
30
fSYNC = 600kHz
20
10
2.75
VIN = 12V
VOUT = 3.3V
fSW = 1MHz
2.70
2.65
CURRENT LIMIT (A)
fSYNC = 2.2MHz
60
110
MAX5088/89 toc21
MAX5088
VOUT = 3.3V
IOUT = 1A
60
TEMPERATURE (°C)
CURRENT LIMIT
vs. TEMPERATURE
MAX5088/89 toc20
SWITCHING SUPPLY CURRENT (mA)
80
10
2.60
2.55
2.50
2.45
2.40
fSYNC = 300kHz
0
2.35
-50
-25
0
25
50
75
TEMPERATURE (°C)
100
125
-40
10
60
110
TEMPERATURE (°C)
_______________________________________________________________________________________
7
NBY61990NBY619:
````````````````````````````````````````````````````````````````````࢜ቯ৔ᔫᄂቶ)ኚDž
(V+ = VL = 5.2V, TA = +25°C, Figures 5 and 6, unless otherwise noted.)
NBY61990NBY619:
3/3NI{Ă3Bଢ଼ኹቯᓞધ໭ดᒙ঱‫ܟ‬ఎਈ
``````````````````````````````````````````````````````````````````````````````፛୭ႁී
፛୭
෗߂
1, 2
DRAIN
ด‫ݝ‬৖ൈNPTGFUࡼധ૵ೌ୻࣡ă‫ݧ‬፿NPTGFUᔫᆐ঱‫ܟ‬ఎਈLjESBJOೌ୻ᒗၒྜྷ࢟Ꮞă
3
COMP
ోࡴᇙ‫ތ‬हࡍ໭ၒ߲࣡ăೌ୻‫ޡݗ‬ᆀ൥᎖DPNQᒗTHOELj૞࠭DPNQࡵGCᏳࡵTHOE )‫ݬ‬ఠ‫ݝޡݗ‬ॊ*ă
4
FB
5
OSC
6
BYPASS
7
V+
࢟Ꮞ࢟ኹၒྜྷăW,ࡼपᆍᆐ6/6Wᒗ34Wăၒྜྷ࢟ኹᆐ5/6Wᒗ6/6WဟLj୓W,ᎧWM ሤೌ୻ă‫ݧ‬፿ጙৈᔢቃ1/2μGࡼ
ჿࠣ࢟ྏ๬വW,ᒗTHOEă
8
VL
ด‫ݝ‬ᆮኹ໭ၒ߲ă‫ݧ‬፿ጙৈ5/8μGࡼჿࠣ࢟ྏ๬വWM ᒗTHOELjጙৈ1/2μGࡼჿࠣ࢟ྏ໭๬വWM ᒗQHOEă
ၒྜྷ࢟ኹᆐ5/6Wᒗ6/6WဟLj୓W,ᎧWM ሤೌ୻ă
नౣၒྜྷă࠭ၒ߲࣡ࡵGCᏳࡵTHOEᒄମೌ୻࢟ᔜॊኹ໭ጲ࿸ᒙၒ߲࢟ኹă
ఎਈຫൈ࿸ᒙၒྜྷăPTDᎧTHOEᒄମೌ୻࢟ᔜSPTDLj࿸ᒙఎਈຫൈăࡩဧ፿ᅪ‫ݝ‬ᄴ‫ݛ‬ဟLj።ᄰਭSPTD
࿸ᒙఎਈຫൈǖ)1/3 y gTZOD* ≤ gTX ≤ )2/3 y gTZOD*ă૾ဧ‫ݧ‬፿ᅪ‫ݝ‬ᄴ‫ݛ‬Lj྆ኊገSPTDă
૥ᓰ๬വೌ୻࣡ăဧ፿ጙৈ1/33μG૞ৎࡍࡼჿࠣ࢟ྏ๬വᒗTHOEă
CKO
ဟᒩၒ߲)ஞNBY6199*ăDLPࡼၒ߲ຫൈᎧᓞધ໭ఎਈຫൈሤᄴLjሤᆡሤ‫ތ‬226°ăDLPభጲ፿᎖ᄴ‫ݛ‬NBY6199
Ꭷ໚ჇNBY61990NBY619:ᒄମࡼ৔ᔫă
DL
ࢅ‫ܟ‬ᄴ‫ݛ‬ᑳഗ໭དࣅ໭)ஞNBY619:*ăEMࡼᏎ߲࢟ഗᆐ1/8BLjᇢྜྷ࢟ഗᆐ2BLjถ౐Ⴅࡴᄰ૞ਈࣥᅪ‫ݝ‬ᄴ‫ݛ‬ᑳഗ
໭NPTGFUă
9
10
SGND
ቧ੓࢐ă
11
PGND
৖ൈ࢐ăೌ୻ᑳഗ໭औ૵਌ࡼዴ૵Ăၒྜྷ࢟ྏ໭ঌ࣡Ăၒ߲࢟ྏ໭ঌ࣡ਜ਼WM ๬വ࢟ྏঌ࣡ᒗQHOEă
12
SOURCE
13
SYNC
ᅪ‫ݝ‬ᄴ‫ݛ‬ၒྜྷăTZODೌ୻ᒗᅪ‫ݝ‬൝૷࢟ຳࡼဟᒩLj፿᎖ᄴ‫ݛ‬NBY61990NBY619:ăࡩ‫ݙ‬ኊገᄴ‫ݛ‬ဟLjTZOD
ೌ୻ᒗTHOEă
RESET
ఎധࢅ࢟ຳᎌ቉আᆡၒ߲)ஞNBY6199*ăࡩᓞધ໭ࡼၒ߲ࢅ᎖WPVU ‫߂ܪ‬࿸ᒙ࢟ኹࡼ:3/6&ဟLjRESETۣߒࢅ
࢟ຳăࡩWPVU ঱᎖໚‫߂ܪ‬࿸ᒙ࢟ኹࡼ:3/6&ဟLjRESETளਭ311nt )࢜ቯᒋ*ࡼআᆡዓဟઁ‫ܤ‬ᆐ঱࢟ຳă
PGOOD
ఎധ࢟Ꮞ௓ኙၒ߲)ஞNBY619:*ăࡩၒ߲࢟ኹࢅ᎖໚‫߂ܪ‬࿸ᒙ࢟ኹࡼ:3/6&ဟLjQHPPEۣߒࢅ࢟ຳă
15
BST/VDD
ด‫ݝ‬NPTGFUདࣅ໭࢟ᏎၒྜྷăCTU0WEEೌ୻ᒗᅪ‫ݝ‬ჿࠣ࢟ྏ໭ਜ਼औ૵਌)‫ݬ‬୅ᅄ6*ă
16
EN
ဧถၒྜྷăক፛୭ᆐ൝૷ࢅ࢟ຳဟLjਈ‫ܕ‬ᓞધ໭ăᆐ൝૷঱࢟ຳဟLjఎ໪ᓞધ໭ăFO୻WM ဟLj໭ୈࠀ᎖‫ޟ‬
ఎᓨზă
—
EP
ൡഴ੆๤Ljೌ୻ᒗTHOEă୓FQᎧTHOE੆୻ࡵጙ໦భᐐ༓ྲེถೆă
14
8
৖ถ
ด‫ݝ‬৖ൈNPTGFUᏎ૵ೌ୻࣡ăTPVSDFೌ୻ᒗ࢟ঢࡼఎਈ‫ݾ‬Ljྙᅄ6Ⴥာă
_______________________________________________________________________________________
3/3NI{Ă3Bଢ଼ኹቯᓞધ໭ดᒙ঱‫ܟ‬ఎਈ
NBY61990NBY619:
V+
DRAIN
VL
LDO
VL = 5.2V
SYNC
RSENSE
CKO
OSCILLATOR
OSC
4-PULSE
SKIP
BST/VDD
2V
R
200mΩ
1V
Q
N2
BYPASS
SOURCE
Q
ADAPTIVE
BBM
VREF
30Ω
N3
fSW / 4
PGND
EN
DIGITAL
SOFT-START
gm
VREF = 0.6V
FB
COMP
SGND
200mV
RESET
MAX5088
0.92 x VREF
N1
180ms
DELAY
ᅄ2/! NBY6199ऱౖᅄ
_______________________________________________________________________________________
9
NBY61990NBY619:
3/3NI{Ă3Bଢ଼ኹቯᓞધ໭ดᒙ঱‫ܟ‬ఎਈ
V+
DRAIN
VL
LDO
VL = 5.2V
SYNC
RSENSE
OSCILLATOR
OSC
4-PULSE
SKIP
BST/VDD
2V
R
200mΩ
1V
Q
N2
BYPASS
SOURCE
Q
ADAPTIVE
BBM
30Ω
N3
fSW / 4
VL
VREF
DL
PGND
EN
DIGITAL
SOFT-START
gm
VREF = 0.6V
FB
COMP
SGND
200mV
PGOOD
MAX5089
0.92 x VREF
ᅄ3/! NBY619:ऱౖᅄ
10
______________________________________________________________________________________
N1
3/3NI{Ă3Bଢ଼ኹቯᓞધ໭ดᒙ঱‫ܟ‬ఎਈ
QXN఼ᒜ໭
NBY61990NBY619:‫ݧ‬፿൴౑ࢯᒜ)QXN*࢟ኹෝါ఼ᒜଦ
৩ăNBY6199ဵऻᄴ‫ݛ‬ᓞધ໭Lj‫ݧ‬፿ጙৈࢅࡴᄰኹଢ଼ࡼ
ᅪ‫ݝ‬ቆᄂ૥औ૵਌஠ቲᑳഗăऎNBY619:ᐌဵᄴ‫ݛ‬ᓞધ
໭Ljདࣅࢅ‫ܟ‬Ăࢅᐜ૵࢟੗ࡼNPTGFU஠ቲᑳഗLjጲ૝ࡻ
ৎ঱቉ൈă఼ᒜ໭ᎅด‫ݝ‬ᑩ࡬໭‫ޘ‬ညဟᒩLj૞ᑗLjࡩᎅ
ᅪ‫ݝ‬ဟᒩདࣅဟLjᎅTZODၒྜྷ‫ޘ‬ညဟᒩăด‫ࡴోݝ‬ᇙ‫ތ‬
हࡍ໭ᏴDPNQ፛୭‫ޘ‬ညᇙ‫࢟ތ‬ኹࡼ૩ॊLjဣሚ঱ᒇഗற
ࣞăDPNQ࢟ኹၒྜྷࡵQXN‫୷܈‬໭LjᎧด‫ݝ‬2WQ.Q ቓຸ࢟
ኹ‫୷܈‬Lj௼ࢾᐴహ‫ࡍࡼ܈‬ቃăᏴඛৈဟᒩࡼ࿟ဍዘLjᓞ
ધ໭ࡼ঱‫ܟ‬o৥ࡸNPTGFUࡴᄰLjࡴᄰᓨზጙᒇۣߒࡵ఼
ᒜ࢟വ࿸ࢾࡼᐴహ‫܈‬૞ᔢࡍᐴహ‫܈‬Lj૞ᑗଶ‫ࡵހ‬ఎਈ࢟
ഗި߲ᔢࡍ࢟ഗሢă
NBY6199
Ᏼ঱‫ܟ‬NPTGFUඛࠨࡴᄰ໐ମ)‫ݬ‬୅ᅄ6Dž
Lj࢟ঢ࢟ഗᓆ୍࿟
ဍăᏴઁ‫ۍ‬ৈఎਈᒲ໐ดLj঱‫ܟ‬NPTGFUਈࣥLjቆᄂ૥ᑳ
ഗ਌)ᅄ6ᒦࡼE3*‫ۻ‬ᑵሶມᒙऎࡴᄰăᏴࠥ໐ମLjTPVSDF
࢟ኹ‫ۻ‬ὥᆡࡵࢅ᎖࢐࢟ኹ1/6WăႲᓹ࢟ঢ࢟ഗᓆ୍ሆଢ଼Lj
࢟ঢျह໚߼ถLjሶၒ߲ᄋ৙࢟ഗăNPTGFUਈࣥ໐ମLj
ࡩቆᄂ૥ᑳഗ਌ࡴᄰဟLjᔈ௟࢟ྏ)ᅄ 6 ᒦࡼ D21*ᎅ W M
ၒ߲ߠ࢟ăঌᏲ੪༵ဟLj࢟ঢ࢟ഗᏴሆጙৈఎਈᒲ໐ఎ
ဪᒄ༄ᅲཝျहLjNBY6199 ஠ྜྷ‫ೌݙ‬ኚࡴᄰෝါăࡩ
NBY6199৔ᔫ᎖‫ೌݙ‬ኚෝါဟLjᔈ௟࢟ྏభถ્ߠ࢟‫ݙ‬
ᔗăᆐऴᒏ߲ሚᑚᒬ༽ౚLjඛ৆5ৈဟᒩᒲ໐Ljด‫ࡼݝ‬ጙ
ৈࢅ‫ܟ‬41Ωఎਈ)‫ݬ‬୅ᅄ2ᒦࡼO4*Ᏼᓍఎਈਈࣥ໐ମ‫୻ۻ‬
ᄰጙࠨăᑚዹ௓ཀྵۣ೫ᔈ௟࢟ྏࡼঌ࣡౯ᒗQHOELjဧ໚
ถ৫൸ߠᒗWMLjۣᑺด‫ݝ‬৖ൈఎਈᑵཀྵࡴᄰăᑚৈᔈ௟
࢟ྏĐ઩ታđఎਈࡼ৔ᔫᏴ༵Ᏺሆ્ᐆ߅ၒ߲࢟ኹᆬ݆
ࡼ༵ᆈᐐଝăखညਭᏲဟLjࡩ࢟ঢ࢟ഗިਭด‫ݝ‬ఎਈࡼ
ख़ᒋሢഗဟLj঱‫ܟ‬NPTGFU౐ႥਈࣥLj݀ࢀࡗሆጙৈဟᒩ
ᒲ໐ࡼࡵ౶ă
NBY619:
NBY619:ஞ፿᎖ᄴ‫ݛ‬ଢ଼ኹ৔ᔫෝါăᏴ঱‫ܟ‬NPTGFUࡴ
ᄰ໐ମLj࢟ঢ࢟ഗᓆ୍࿟ဍăNPTGFUਈࣥઁLj࢟ঢ࢟ኹ
૵ቶनᓞLjᎧࢅ‫ܟ‬ᄴ‫ݛ‬NPTGFU݀ೊࡼቆᄂ૥ᑳഗ਌‫ۻ‬ᑵ
ሶມᒙăTPVSDF࢟ኹ‫ۻ‬ὥᆡࡵࢅ᎖࢐࢟ኹ1/6WLjᒇࡵள
ਭ೫ጙৈ36otࡼሌࣥઁᄰဟମ)uCCN*ăᏴuCCN ઁLjᄴ‫ݛ‬ᑳ
ഗNPTGFUࡴᄰăႲᓹ࢟ঢ࢟ഗᓆ୍ሆଢ଼Lj࢟ঢျह໚߼
ถLjଖኚሶၒ߲ᄋ৙࢟ഗăࡩNPTGFUਈࣥဟLjᔈ௟࢟ྏ
ጐᎅWM ࡼၒ߲Ᏻࠨߠ࢟ă૾ဧᏴ༵ᏲᓨზሆLjᄴ‫ݛ‬ᑳഗ
໭ጐဧ࢟വۣߒೌኚࡴᄰ৔ᔫෝါăखညਭᏲဟLjࡩ࢟
ঢ࢟ഗި߲ด‫ݝ‬ఎਈࡼख़ᒋሢഗLj঱‫ܟ‬NPTGFUਈࣥLjࢀ
ࡗሆጙৈဟᒩᒲ໐ࡼࡵ౶ă
NBY619:ࡼᄴ‫ݛ‬ᑳഗདࣅ໭ၒ߲)EM*௥ᎌᔈး።ሌࣥઁᄰ
ᄂቶLjభ‫ܜ‬඾ด‫ݝ‬৖ൈNPTGFUਜ਼ᅪ‫ݝ‬ᄴ‫ݛ‬ᑳഗNPTGFU
ୣ‫ࡴބ‬ᄰăᏴਈࣥᄴ‫ݛ‬ᑳഗNPTGFUࡼਭ߈ᒦLjด‫ݝ‬঱‫ܟ‬
৖ൈNPTGFUۣߒਈࣥᓨზLjᒇࡵWEM ሆଢ଼ᒗ1/:8Wጲሆă
ᄴዹLjᒇࡵด‫ݝ‬৖ൈNPTGFUᐜ૵࢟ኹଢ଼ࢅᒗ2/35WጲሆLj
EM‫ܤݣ‬ᆐ঱࢟ຳă
ၒྜྷ࢟ኹ)W,*0ด‫ݝ‬ሣቶᆮኹ໭)WM*
Ⴥᎌด‫఼ݝ‬ᒜ࢟വࡼ৔ᔫ࢟ኹ௿౶ᔈ‫߂ܪ‬ᒋᆐ6/3Wࡼด‫ݝ‬
ᆮኹ໭)WM*ăၒྜྷ࢟ኹ)W,*ᆐ6/6Wᒗ34WဟLjWM ࡼᆮኹᒋ
ᆐ6/3Wăၒྜྷ࢟ኹࢀ᎖૞ࢅ᎖6/6WဟLjด‫ݝ‬ሣቶᆮኹ໭৔
ᔫᏴኹ‫ތ‬ෝါሆLjࠥဟWM ৌႲW,ăো௣WM ᆮኹ໭ࡼঌᏲ
ࡍቃLj໚ኹ‫ތ‬భถࡍࡵᔗጲဧWM ଢ଼ᒗ་ኹჄࢾ)VWMP*ඡ
ሢጲሆă
ၒྜྷ࢟ኹቃ᎖6/6WဟLj୓W,ਜ਼WM ೌ୻Ᏼጙ໦ăWM ࿟ࡼঌ
ᏲᎧᓞધ໭ࡼఎਈຫൈ߅ᑵ‫܈‬ă‫ݬ‬୅࢜ቯ৔ᔫᄂቶᒦWM
ၒ߲࢟ኹᎧఎਈຫൈਈᇹཎሣăၒྜྷ࢟ኹ঱᎖6/6WဟLjኍ
ဧ፿ด‫ݝ‬ᆮኹ໭ă
‫ݧ‬፿ጙৈࢅFTSĂ࢟ྏᒋࡍ᎖ࢀ᎖1/2μGࡼჿࠣ࢟ྏ๬വ
W,ᒗTHOELjক࢟ྏ።஧భถణதNBY61990NBY619:ह
ᒙăWM ࿟ࡼ࢟ഗବख़્ছཷᎅWM ৙࢟ࡼด‫࢟ݝ‬വLjፐࠥ
‫ݧ‬፿ጙৈࢅFTSĂ1/2μGࡼჿࠣ࢟ྏ๬വWM ᒗQHOELj݀
‫ݧ‬፿ጙৈࢅFTSĂ5/8μG࢟ྏ๬വWM ᒗTHOEă
______________________________________________________________________________________
11
NBY61990NBY619:
``````````````````````````````` ሮᇼႁී
NBY61990NBY619:
3/3NI{Ă3Bଢ଼ኹቯᓞધ໭ดᒙ঱‫ܟ‬ఎਈ
ဧถ
FO ᆐ঱ᎌ቉ၒྜྷLjถఎ໪ਜ਼ਈ‫ ܕ‬NBY61990NBY619:ă
FOဵUUM൝૷ၒྜྷLj൝૷঱࢟ຳᆐ3/1WLj൝૷ࢅ࢟ຳᆐ
1/9WăࡩFOᆐ঱࢟ຳဟLjด‫ݝ‬ၫᔊྟ໪ࣅદൻဍ঱ด‫ݝ‬
૥ᓰ࢟ኹLj࠭ऎဣሚၒ߲ྟ໪ࣅăকᒣૄభဧᓞધ໭Ᏼ
൝૷ࡴᄰ໐ମ‫ݙ‬ጵ၊ࡵছཷăFO࣡ࡼ࢟ኹ‫ܤ‬છ્ᒦࣥྟ
໪ࣅਭ߈Lj݀ᐆ߅‫ܕ‬ჄăጙࡡFOᎌ቉Lj።ཀྵۣFOᒗ࿩ถ
ۣߒ6ntࡼ঱࢟ຳă୓FO༓ᒜ౯ᆐࢅ࢟ຳဟLjด‫ݝ‬৖ൈ
NPTGFUਈࣥLj݀୓RESET౯ᆐࢅ࢟ຳ)NBY6199*Lj૞୓
QHPPE౯ᆐࢅ࢟ຳ)NBY619:*ă‫ݙ‬ဧ፿ဧถ৖ถဟLj୓
FOೌ୻ᒗWMă
ྟ໪ࣅ0ྟᄫᒏ
NBY61990NBY619:௥ᎌࡒᒣૄࡼ་ኹ‫ܕ‬Ⴤ)VWMP*Ljถሿ
߹໪ࣅਭ߈ᒦࡼᑩ࡬ăVWMP࢟വభᏴW,ࡉࡵ5/6Wᒄ༄ۣ
ߒNBY61990NBY619:ࠀ᎖ਈࣥᓨზLjऎᏴW,ଢ଼ࡵ5/4Wጲ
ሆઁਈ‫ܕ‬ক໭ୈăNBY61990NBY619:થ௥ᎌྟ໪ࣅ৖ถLj
భᏴ໪ࣅ໐ମଢ଼ࢅၒྜྷ࣡ࡼ಍፻࢟ഗਜ਼൴ߡছཷăࡩࡉ
ࡵVWMPඡሢ૞FOᎅࢅ‫ܤ‬঱ဧ໭ୈ஠ྜྷ໪ࣅਭ߈ဟLjၫ
ᔊྟ໪ࣅॊ75଀ᓆ‫ݛ‬ဍ঱૥ᓰ࢟ኹ)WCZQBTT*ăᏴਈࣥ໐
ମ)ᄰਭ୓FO૞W,౯ࢅ*Lj૥ᓰ࢟ኹદൻଢ଼ᒗഃăྟ໪ࣅ
ਜ਼ྟᄫᒏࡼဟମ)uTT*ဵ51:7ৈด‫ݝ‬ᑩ࡬໭ᒲ໐ăಽ፿ሆ೰
৛ါ౶ଐႯྟ໪ࣅ0ྟᄫᒏဟମǖ
t SS =
4096
fSW
gTX ဵᓞધ໭ࡼఎਈຫൈă
ᑩ࡬໭0ᄴ‫)ݛ‬TZOD*0ဟᒩၒ߲)DMLPVU*
ဟᒩຫൈ)૞ఎਈຫൈ*ᎅด‫ޘݝ‬ညLj݀ᄰਭPTDᎧTHOE
ᒄମೌ୻ࡼᅪ‫࢟ݝ‬ᔜ஠ቲࢯஂăSPTD ᎧgTX ࡼਈᇹᆐǖ
ROSC =
125 × 108 Ω / s
fSW
gTX ࡼࢯஂपᆍᆐ311lI{ᒗ3/3NI{ă
ᏴTZOD࣡ೌ୻ጙৈຫൈ஑᎖311lI{ਜ਼3/3NI{ᒄମࡼ൝૷
࢟ຳဟᒩLjభጲᅪ‫ݝ‬ᄴ‫ݛ‬NBY61990NBY619:ࡼᑩ࡬໭)‫ݬ‬
୅ᅄ8*ăNBY61990NBY619:ᎧTZODဟᒩࡼ࿟ဍዘᄴ‫ݛ‬ă
TZODဟᒩࡼ࿟ဍዘᎧด‫ݝ‬o৥ࡸ৖ൈNPTGFUࡼࡴᄰዘᄴ
‫ݛ‬Lj໚ମᎌጙৈৼࢾࡼࠅၒዓߕăࡩNBY61990NBY619:
‫ݧ‬፿ᅪ‫ݝ‬TZODဟᒩ৔ᔫဟLj྆ኍ‫ڔ‬ᓤSPTDăࠥဟด‫ݝ‬ఎ
12
ਈຫൈ።࿸ᒙᏴ)1/3 y gTZOD* ≤ gTX ≤ )2/3 y gTZOD*ăgTZOD
ࡼᔢቃ൴౑ᆐ211otăྙਫ‫ݙ‬ဧ፿ᄴ‫ݛ‬Lj୓TZODೌ୻ᒗ
THOEă
DLPၒ߲)ஞNBY6199*ဵጙৈ൝૷࢟ຳဟᒩLjᎧgTX ௥ᎌሤ
ᄴຫൈLjሤ࣪᎖TZODဟᒩ௥ᎌ226°ࡼጤሤăೝৈNBY6199
భೌ୻߅ᓍ0࠭ါଦ৩Ljጲဣሚೝവ࢟Ꮞ)291°*ࡇሤ৔ᔫă
ᓍ૦ࡼDLPၒ߲དࣅ࠭૦ࡼTZODၒྜྷLjተ߅ၷሤᓞધ໭ă
ྙገဣሚ291°ࡼनሤ৔ᔫෝါLjభ‫ݧ‬፿ሤᄴᔜᒋࡼSPTDLj
୓ೝৈᓞધ໭ࡼด‫ݝ‬ఎਈຫൈ࿸ᒙࡻ‫୻ࠥ܋‬தăࡩ፿ጙ
ৈᅪ‫ݝ‬ဟᒩᄴ‫ݛ‬ᓍ.࠭ါଦ৩ဟLj፿SPTD ࿸ᒙด‫ݝ‬ఎਈຫ
ൈဧ໚Ꮦࢀ᎖ᅪ‫ݝ‬ဟᒩຫൈ)gTZOD*Ljᑚዹభጲဣሚᆬ݆ሤ
ᆡሤ‫ތ‬291°ࡼ৔ᔫෝါ)‫ݬ‬୅ᅄ8*ăด‫ݝ‬ఎਈຫൈᎧgTZOD
ࡼྀੜ‫୓࣒ܰތ‬খ‫ܤ‬ሤᆡዓߕăྙਫᓍĂ࠭ᓞધ໭௿ဧ
፿ሤᄴࡼ࢟ᏎLj݀༦ৢ፿ጙৈၒྜྷ๬വ࢟ྏLjᐌၒྜྷ࣡
ࡼࢀ቉ఎਈຫൈဵඛৈᓞધ໭ఎਈຫൈࡼೝ۶ăၒྜྷ࢟
ྏࡼᆬ݆ຫൈᏗ঱Ljᐌ࢟ྏ໭ᒦࡼSNTᆬ݆࢟ഗᏗࢅă
ሢഗ
ࡩNBY61990NBY619:৔ᔫᏴଢ଼ኹෝါሆဟLjభᑣ࣪ၒ߲
ਭᏲਜ਼࣢വ৺ᑇᄋ৙ۣઐăด‫࢟ݝ‬ഗଶ‫ޘ଀ހ‬ညጙৈᎧၾ
ზఎਈ࢟ഗ߅ᑵ‫࢟ࡼ܈‬ኹăࡩఎਈ࢟ഗࡉࡵ3/9B )࢜ቯᒋ*
ဟLj৖ൈNPTGFUਈࣥLj݀ጙᒇۣߒᆐਈࣥᓨზLjᒇࡵሆ
ጙৈᒲ໐ࡵ౶ă
ᏴዏᒮਭᏲ૞࣢വ໐ମLjࡩၒ߲࢟ኹ‫ۻ‬౯ᒗ࢐ဟLj࢟ঢह
࢟ࡼቓൈᆐWET )ᄴ‫ݛ‬GFUೝ࣡ࡼ࢟ኹ*૞WG )ᑳഗऔ૵਌ೝ
࣡ࡼ࢟ኹ*߹ጲMă੪࣢ࡼਈࣥဟମ‫ݙ‬ถဧ࢟ঢ࢟ഗᑵ‫ޟ‬ሆ
ଢ଼Lj્ࡴᒘᆉሙࡼ࢟ഗပ఼Ljጲᒗభถ્Ⴜડ໭ୈăᆐ೫
ऴᒏ߲ሚᑚᒬ༽ౚLjNBY61990NBY619:ᄋ৙೫ຫൈᑓऩ
ᄂቶăࡩଶ‫ࡵހ‬ሢഗဟLjຫൈଢ଼ࢅᒗ࿸ᒙࡼఎਈຫൈࡼ
205ăࡩၒ߲࢟ኹଢ଼ࢅᒗ‫߂ܪ‬࿸ᒙ࢟ኹࡼ204 )WGC > 1/3W*ጲ
ሆဟLjᓞધ໭ਈࣥLj݀໪ࣅྟ໪ࣅᒲ໐ăᑚዹଢ଼ࢅ೫৺ᑇ
ᓨზሆᓞધ໭Ꮞ߲ࡼSNT࢟ഗă
Ᏼ୷঱ࡼၒྜྷ.ၒ߲ኹ‫ތ‬ਜ਼঱ఎਈຫൈሆLjࡴᄰဟମଢ଼ࢅ
ᒗ211ot೟଀ă஧਌NBY61990NBY619:భጲ୓ࡴᄰဟମ఼
ᒜᏴ211otLjด‫ݝ‬ሢഗ࢟വསᇄजᏴᑚඐ࣢ࡼဟମดଶ‫ހ‬
ࡵਭഗăᏴࠥ༽ౚሆLjखည৺ᑇဟࡼၒ߲࢟ഗభถި߲
Fmfdusjdbm! Dibsbdufsjtujdt ‫ܭ‬ᒦਖࢾࡼሢഗᒋăᄰਭེਈࣥ৖
ถLj྆భᏴၒ߲࣢വ৺ᑇሆۣઐNBY61990NBY619:ăࡣ
ဵLjၒ߲࢟ഗభถ঱ࡉ6/6Băྙਫ৊ࢾຫൈਜ਼ᐴహ‫܈‬ᄟୈ
ሆࡼᔢቃࡴᄰဟମቃ᎖311otLjᐌ።ኡᐋጙৈ‫ۥ‬ਜ਼࢟ഗࡍ
᎖6/6Bࡼ࢟ঢă
______________________________________________________________________________________
3/3NI{Ă3Bଢ଼ኹቯᓞધ໭ดᒙ঱‫ܟ‬ఎਈ
``````````````````````````````` ።፿ቧᇦ
RESETᆐࢅᎌ቉ఎധၒ߲LjࡩWPVU ଢ଼ᒗ໚‫߂ܪ‬࿸ᒙ࢟ኹ
ࡼ:3/6&ጲሆဟLjRESET‫ۻ‬౯ࢅăࡩWPVU ဍᒗ໚‫߂ܪ‬࿸ᒙ
࢟ኹࡼ:3/6&ጲ࿟Ăྟ໪ࣅஉၦ༦ளਭ311nt )࢜ቯᒋ*ዓဟ
ઁLjRESET‫ܤ‬ᆐ঱ᔜఝᓨზăRESETᎧ൝૷࢟ኹ૞WM ᒄ
ମೌ୻ጙৈ࿟౯࢟ᔜăRESET፛୭࿟ࡼด‫ݝ‬ఎധNPTGFU
ᇢ၃4nB࢟ഗဟ྆భᄋ৙UUMରྏࡼ൝૷ࢅ࢟ຳቧ੓ă‫ݙ‬
ဧ፿ဟLjRESET୻THOE૞ኞహă
࿸ᒙఎਈຫൈ
࢟Ꮞ௓ኙ)QHPPE*
)ஞNBY619:*
QHPPEဵఎധĂ঱ᎌ቉ၒ߲LjࡩWPVU ଢ଼ᒗ໚‫߂ܪ‬࿸ᒙ࢟
ኹࡼ:3/6&ጲሆဟLjQHPPEᆐࢅ࢟ຳLjऎࡩW PVU ဍᒗ໚
‫߂ܪ‬࿸ᒙ࢟ኹࡼ :3/6&ጲ࿟ဟLjQHPPE ᆐ঱ᔜఝᓨზă
QHPPEᎧ൝૷࢟ຳ૞WM ᒄମೌ୻ጙৈ࿟౯࢟ᔜăQHPPE
ถ৫ᇢ၃঱ࡉ4nB࢟ഗLjᄴဟᄋ৙UUMରྏ൝૷ࢅ࢟ຳă
౯ࢅFOLjᐌདࣅQHPPEᆐࢅ࢟ຳă‫ݙ‬ဧ፿ဟLjQHPPE୻
THOE૞ኞహă
ེਭᏲۣઐ
Ᏼၒ߲ߒኚ࣢വ૞ਭᏲ໐ମLjNBY61990NBY619:ࡼ৖੒
્ިਭ໚૵ሢᒋăࡩ਌በᆨࣞިਭ,281°DဟLjNBY61990
NBY619:ᄋ৙ด‫ེݝ‬ਈࣥ৖ถLjభਈࣥ໭ୈăຢ࿟ᆨࣞࠅ
ঢ໭ପ‫ހ‬਌በᆨࣞLjࡩஉᆨሆଢ଼,36°DઁLjᆨࣞࠅঢ໭Ᏻ
ࠨ໪ࣅ໭ୈăེਈࣥ໐ମLjด‫ݝ‬৖ൈNPTGFUਈࣥLjEM౯
ᒗTHOELjWM ਈࣥLjRESET )NBY6199*0QHPPE )NBY619:*
౯ࢅLjྟ໪ࣅࠀ᎖আᆡᓨზă
఼ᒜ໭ᄰਭด‫ݝ‬ᑩ࡬໭૞ဧ፿ᅪ‫ݝ‬ᑩ࡬໭དࣅࡼ TZOD
)gTZOD*ၒྜྷቧ੓‫ޘ‬ညఎਈຫൈ)gTX*ăఎਈຫൈࢀ᎖gTX ૞
gTZODă
PTDਜ਼THOEᒄମೌ୻ࡼ࢟ᔜ)SPTD*࿸ࢾด‫ݝ‬ᑩ࡬໭ăgTX
ਜ਼SPTD ମࡼਈᇹဵǖ
ROSC =
125 × 108
fSW
ါᒦgTXࡼ࡝ᆡᆐ੣ᓼLjSPTDࡼ࡝ᆡᆐ๏෱ăಿྙLjSPTD >
21lΩဟLj࿸ࢾࡼఎਈຫൈᆐ2/36NI{ăৎ঱ࡼఎਈຫൈᏤ
኏Ᏼ࿸ଐᒦဧ፿ৎࢅࡼ࢟ঢᒋਜ਼ৎ࿩ࡼၒ߲࢟ྏăᄴဟLj
ఎਈຫൈ୷঱ဟख़ᒋ࢟ഗਜ਼J3SႼ੒୷ࢅLjࡣဵࠟበႼ੒Ă
ᐜ૵ߠ࢟࢟ഗጲૺఎਈႼ੒્ᐐଝă
NBY61990NBY619:
࿟࢟আᆡ)SFTFU*
)ஞNBY6199*
TZODࡼဟᒩ࿟ဍዘ‫ۻ‬၁ᔫᄴ‫ݛ‬ၒྜྷăྙਫTZODቧ੓ࣀပLj
ᐌᎅด‫ݝ‬ᑩ࡬໭఼ᒜఎਈLj૾ᓞऎ‫ݧ‬፿ᎅS PTD ࿸ࢾࡼఎ
ਈຫൈăᑚዹ૾ဧဵᏴTZODቧ੓ମࣥࡼ༽ౚሆLjၒ߲࢟
ኹጐభۣߒᆮࢾăࡩဧ፿ᅪ‫ݝ‬ᄴ‫ݛ‬ቧ੓ဟLj࿸ᒙS PTD ጲ
ဧࡻ)1/3 y gTZOD* ≤ gTX ≤ )2/3 y gTZOD*ă
ଢ଼ኹᓞધ໭
‫ݧ‬፿ด‫ݝ‬o৥ࡸ৖ൈNPTGFUᔫᆐ঱‫ܟ‬ఎਈLj୓NBY61990
NBY619: ๼ᒙᆐጙৈଢ଼ኹᓞધ໭ă‫ݧ‬፿ᑚᒬ๼ᒙဟLj
TPVSDFೌ୻ᒗ࢟ঢLjESBJOೌ୻ᒗၒྜྷLjCTU0WEEೌ୻
ᒗᔈ௟औ૵਌ፓ૵ਜ਼࢟ྏăᅄ6ਜ਼ᅄ7ॊܰ৊߲೫NBY61990
NBY619:ଢ଼ኹ๼ᒙࡼ࢜ቯ።፿࢟വă
______________________________________________________________________________________
13
NBY61990NBY619:
3/3NI{Ă3Bଢ଼ኹቯᓞધ໭ดᒙ঱‫ܟ‬ఎਈ
ᎌ቉ၒྜྷ࢟ኹपᆍ
NBY61990NBY619:భ৔ᔫᏴ5/6Wᒗ6/6W૞6/6Wᒗ34Wၒ
ྜྷ࢟ኹपᆍăၒྜྷ࢟ኹपᆍ)W,*ࡼᔢቃᒋਜ਼ᔢࡍᒋથॊܰ
၊ࡵᐴహ‫܈‬ਜ਼ࡴᄰဟମࡼᒜᏖăᔢቃၒྜྷ࢟ኹᆐǖ
V
+ VDROP1
VIN _ MIN = OUT
+ VDROP2 − VDROP1
DMAX
ENBY ဵᔢࡍᐴహ‫܈‬98/6& )࢜ቯᒋ*ăWESPQ2 ᆐ࢟ঢह࢟ᄰ
വࡼᔐ࢟ኹࢰൢLj۞౪औ૵਌ࡼࡴᄰኹଢ଼)૞ᄴ‫ݛ‬ᑳഗ໭
NPTGFUೝ࣡ࡼኹଢ଼*Ă࢟ঢࢀ቉ࠈೊ࢟ᔜࡼኹଢ଼ጲૺQDC
‫ݚ‬ሣࡼኹଢ଼ăW ESPQ3 ဵ࢟ঢߠ࢟ᄰവᔐኹଢ଼Lj۞౪ด‫ݝ‬
৖ൈNPTGFUೝ࣡ࡼኹଢ଼Ă࢟ঢࢀ቉ࠈೊ࢟ᔜࡼኹଢ଼ጲૺ
QDC‫ݚ‬ሣࡼኹଢ଼ă
ᔢࡍၒྜྷ࢟ኹᆐǖ
VIN _ MAX =
VOUT
t ON _ MIN × fSW
໚ᒦuPO`NJO > 211otLjgTX ᆐఎਈຫൈă
࿸ᒙၒ߲࢟ኹ
ྙਫኊገ1/7W૞ᑗৎ঱ࡼၒ߲࢟ኹLjభᏴWPVU ਜ਼THOEᒄ
ମ୻ጙ࢟ᔜॊኹ໭ᒗGCăS3࢟ᔜ)ೌ୻ᏴGCਜ਼THOEᒄମ*
።஑᎖2lΩਜ਼21lΩᒄମă‫ݧ‬፿ሆ೰৛ါଐႯPVUᎧGCᒄ
ମࡼ࢟ᔜ)S2*ǖ
⎡V
⎤
R1 = R2 × ⎢ OUT − 1⎥
⎣ VFB
⎦
໚ᒦWGC > 1/7WLj‫ݬ‬୅ᅄ4ă
࣪᎖‫ݧ‬፿JJJቯ‫ޡݗ‬ऱ‫ࡼښ‬࿸ଐLj၅ሌ።ଐႯS2ጲ൸ᔗᆮࢾ
ቶገཇ)‫ݬ‬୅‫ݝޡݗ‬ॊ*Lj཭ઁᏳኡᐋးࡩࡼS3ǖ
R2 =
R1 × VFB
VOUT − VFB
ਜ਼࢟ഗ)JTBU*ăჅኊ࢟ঢ೟ࡼᔢቃᒋဵ৔ᔫຫൈĂၒྜྷ.ၒ
߲࢟ኹ‫ތ‬ਜ਼࢟ঢ࢟ഗख़.ख़ᒋ)ΔJ Q.Q*ࡼ਽ၫăΔJ Q.Q ୷঱ဟ
Ꮴ኏ኡ፿୷ቃࡼ࢟ঢᒋLjऎΔJ Q.Q ୷ࢅဟᐌኊገኡ፿୷ࡍ
ࡼ࢟ঢᒋă୷ቃࡼ࢟ঢᒋభጲିቃߛࡁĂଢ଼ࢅ߅‫݀۾‬খ
࿖ࡍቧ੓ૺၾზሰ።LjࡣဵᏴሤᄴࡼၒ߲࢟ྏ༽ౚሆLj
ᎅ᎖‫ޘ‬ည୷঱ࡼख़ᒋ࢟ഗਜ਼୷঱ࡼख़.ख़ၒ߲ᆬ݆࢟ኹLj
࠭ऎࡴᒘ቉ൈଢ଼ࢅă഍ጙऱෂLj୷ࡍࡼ࢟ঢᒋିቃ೫ᆬ
݆࢟ഗLj࠭ऎᄋ঱೫቉ൈăࡣऄᅪࡼሣམᐐࡍ೫࢟ᔜႼ
੒Lj࠭ऎࢎሿ೫ࢅᆬ݆࢟ഗଢ଼ࢅჅࡒ౶ࡼੑࠀLjᄂܰဵ
ࡩ࢟ঢᒋᐐଝऎ࢟ঢߛࡁ‫ݙ‬ถᐐଝဟăጙৈੑࡼᑓᒪऱ
‫ဵښ‬ኡᐋΔJQ.Q ࢀ᎖൸Ᏺ࢟ഗࡼ41&ă‫ݧ‬፿ሆ೰৛ါଐႯ࢟
ঢᒋǖ
V
(V − V
)
L = OUT IN OUT
VIN × fSW × ΔIP−P
WJO ਜ਼WPVU ௿ᆐ࢜ቯᒋLj࠭ऎᏴ࢜ቯ৔ᔫᓨზሆ቉ൈࡉࡵ
ᔢ঱ăఎਈຫൈᎅSPTD ࿸ࢾ)‫ݬ‬୅࿸ᒙఎਈຫൈ‫ݝ‬ॊ*ă࢟
ঢ࢟ഗख़.ख़ᒋन፯೫ၒ߲ᆬ݆ख़.ख़ᒋࡼࡍቃLjၒྜྷ࢟ኹ
ᔢࡍဟ࢟ঢ࢟ഗख़.ख़ᒋጐᔢࡍă༿‫ݬ‬୅ ၒ߲࢟ྏ ‫ݝ‬ॊLj
ཀྵࢾ໚ᔢࡍၒ߲ᆬ݆ဵ॥൸ᔗገཇăᆐ೫‫ܜ‬඾Ᏼၒ߲ೌ
ኚ࣢വ໐ମ‫ޘ‬ညပ఼࢟ഗLj࢟ঢ‫ۥ‬ਜ਼࢟ഗጐဵऻ‫ޟ‬ᒮገ
ࡼăᏴ୷঱ࡼၒྜྷ.ၒ߲࢟ኹ‫ތ‬ਜ਼୷঱ࡼఎਈຫൈሆLjࡴ
ᄰဟମଢ଼ࢅᒗ211otăႰ཭NBY61990NBY619:ถ୓ࡴᄰဟ
ମ఼ᒜᏴ211otLjࡣด‫ݝ‬ሢഗ࢟വᏴকဟମดభถଶ‫ݙހ‬
ࡵਭഗăᏴᑚᒬ༽ౚሆLj৺ᑇဟࡼၒ߲࢟ഗభถ્ި߲
࢟໮ᄂቶ‫ܭ‬ᒦਖࢾࡼሢഗᒋăེਈࣥ৖ถభᏴᑚᒬ༽ౚ
ሆۣઐNBY61990NBY619:ă཭ऎLjၒ߲࢟ഗభถࡉࡵ
6/6BăᏴ৊ࢾࡼຫൈਜ਼ᐴహ‫܈‬ሆLjྦᔢቃࡴᄰဟମቃ᎖
311otLj።ኡᐋጙৈ‫ۥ‬ਜ਼࢟ഗࡍ᎖6/6Bࡼ࢟ঢă
ၒྜྷ࢟ྏ
ଢ଼ኹቯᓞધ໭ࡼ‫ೌݙ‬ኚၒྜྷ࢟ഗ્፛໦୷ࡍࡼၒྜྷᆬ݆
࢟ഗăఎਈຫൈĂख़ᒋ࢟ঢ࢟ഗጲૺᏤ኏ࡼၒྜྷ࢟ኹᆬ
݆ख़.ख़ᒋ௼ࢾ೫࣪᎖ၒྜྷ࢟ྏࡼገཇăᄋ঱ఎਈຫൈ૞
࢟ঢᒋభጲଢ଼ࢅख़ᒋ࢟ഗᎧຳ௿࢟ഗࡼ‫܈‬ᒋLj࠭ऎଢ଼ࢅ
࣪ၒྜྷ࢟ྏࡼገཇă
‫ݬ‬୅ᅄ5ă
࢟ঢࡼኡᐋ
ኡᐋNBY61990NBY619:ࡼᅪ୻࢟ঢLj‫ܘ‬ኍཀྵࢾጲሆྯৈ
ਈ୆‫ݬ‬ၫǖ࢟ঢᒋ)M*Ăख़ᒋ࢟ঢ࢟ഗ)JQFBL*ጲૺ࢟ঢ‫ۥ‬
14
______________________________________________________________________________________
3/3NI{Ă3Bଢ଼ኹቯᓞધ໭ดᒙ঱‫ܟ‬ఎਈ
ESR =
CIN =
ΔVESR
ΔIP−P ⎞
⎛
⎜IOUT +
⎟
⎝
2 ⎠
IOUT × D(1− D)
ΔVQ × fSW
໚ᒦǖ
ΔIP−P =
(VIN − VOUT ) × VOUT
VIN × fSW × L
V
D = OUT
VIN
໚ᒦJ PVU ဵၒ߲࢟ഗLjEဵᐴహ‫܈‬ăg TX ဵఎਈຫൈăᏴ
୷ࢅࡼၒྜྷ࢟ኹሆLj።‫ݧ‬፿ৎࣶࡼၒྜྷ࢟ྏLjጲ‫ܜ‬඾ঌ
Ᏺၾ‫ܤ‬໐ମ‫ޘ‬ညࢅ᎖VWMPඡሢࡼਭߡă
໚ᒦǖ
ΔIP −P =
VIN × fSW × L
VOUT _ RIPPLE ≅ ΔVESR + ΔVQ
ΔJQ.Q ဵ࿟ෂჅଐႯ߲ࡼ࢟ঢ࢟ഗख़.ख़ᒋăgTX ဵඛৈᓞધ
໭ࡼఎਈຫൈă
ၒ߲࢟ྏᒋૺ໚FTSથན௼᎖ঌᏲ౐Ⴅၾ‫ܤ‬ဟჅᏤ኏ࡼၒ߲
࢟ኹມ‫ތ‬ăࡩঌᏲᅃᐐဟLjᏴ఼ᒜ໭ጲৎࡍࡼᐴహ‫܈‬ሰ።
ᒄ༄Ljᎅၒ߲࢟ྏᄋ৙ᅃ‫ܤ‬ঌᏲ࢟ഗăሰ።ဟମ)uSFTQPOTF*
ན௼᎖ᓞધ໭ࡼ‫ܕ‬ણࡒ౑ăNBY61990NBY619:ࡼ঱ఎਈຫ
ൈభဣሚ୷঱ࡼ‫ܕ‬ણࡒ౑Ljିቃ೫u SFTQPOTF ਜ਼࣪ၒ߲࢟
ྏࡼገཇăᏴঌᏲᅃ‫ܤ‬໐ମLjၒ߲࢟ྏFTSೝ࣡ࡼᔜቶኹ
ଢ଼ਜ਼࢟ྏह્࢟፛໦࢟ኹࢰൢă୓ࢅFTSࡼᶉ࢟ྏਜ਼ჿࠣ
࢟ྏஉ੝ဧ፿Ljభጲ૝ࡻৎੑࡼঌᏲၾზሰ።ਜ਼ᆬ݆0ᐅ
ፒቶถăၒ߲࢟ኹࡼᔢࡍມ‫ތ‬።ဪᒫࠀ᎖໚Ⴥདࣅ࢟വ
ࡼྏ኏पᆍดăဧ፿ჿࠣ࢟ྏဟLjଣࢾၒ߲࢟ྏह࢟ਜ਼
FTSࢰൢჅৡማࡼኹଢ଼ॊܰᐴ91&ਜ਼31&ăభ፿ሆ೰৛ါ
ଐႯჅኊࡼFTSਜ਼࢟ྏᒋǖ
ESROUT =
ၒ߲࢟ྏ
ၒ߲࢟ྏᒋૺ໚FTSན௼᎖ถ৫Ꮴ኏ࡼၒ߲࢟ኹᆬ݆ਜ਼ঌ
Ᏺ࢟ഗᅃ‫ܤ‬ဟၒ߲࢟ኹࡼᔢࡍມጤ೟ă
ၒ߲ᆬ݆ᎅΔWR )ᎅ࢟ྏह࢟፛໦*ਜ਼ΔWFTS )ᎅ࢟ྏࡼFTS
፛໦*ᔝ߅ăၒ߲።ဧ፿ࢅFTSࡼჿࠣ࢟ྏ૞ി࢟ஊ࢟ྏă
࣪ി࢟ஊ࢟ྏ౶ႁLjᔐၒ߲ᆬ݆ᓍገဵᎅΔWFTS ፛໦ࡼă
ဧ፿FTS PVU ৛ါଐႯჅኊࡼFTSLj݀భ௣ࠥኡᐋሤ።ࡼ
࢟ྏăྙਫ‫ݧ‬፿ჿࠣ࢟ྏLjଣࢾ౶ᔈFTSਜ਼౶ᔈ࢟ྏह࢟
ࡼၒ߲ᆬ݆࢟ኹሤࢀă࣪᎖ᄂࢾࡼၒ߲࢟ኹᆬ݆Lj‫ݧ‬፿
ሆ೰৛ါଐႯჅኊࡼၒ߲࢟ྏᒋૺ໚FTSǖ
ΔVESR
ΔIP-P
ΔIP-P
COUT =
8 × ΔVQ × fSW
ESR =
(VIN − VOUT ) × VOUT
ΔVESR
ISTEP
×t
I
COUT = STEP RESPONSE
ΔVQ
໚ᒦJTUFQ ဵঌᏲ࢟ഗᅃ‫ܤ‬LjuSFTQPOTF ဵ఼ᒜ໭ࡼሰ።ဟ
ମă఼ᒜ໭ሰ።ဟମན௼᎖఼ᒜણവࡒ౑ă
৖੒
NBY61990NBY619:‫ݧ‬፿ᐐ༓ྲེࡼ27፛୭Ă6nn y 6nn
URGOॖᓤLjᏴUB > ,81°DሆLjభ੒ྲ৖ൈ঱ࡉ3/8Xăࡩ
਌በᆨࣞࡉࡵ,281°DဟLjNBY61990NBY619:ਈࣥ)‫ݬ‬୅ེ
ਭᏲۣઐ ‫ݝ‬ॊ*ăক໭ୈࡼᔐ৖੒ࢀ᎖࢟Ꮞ࢟ഗࡼ৖੒
)QR*Ă༤ધด‫ݝ‬৖ൈNPTGFUჅ੒ྲࡼ৖ൈ)QTX*ਜ਼ഗਭด
‫ݝ‬৖ൈNPTGFUࡼSNT࢟ഗჅሿ੒ࡼ৖ൈ)QNPTGFU*ᒄਜ਼ă
ॖᓤดࡼᔐ৖੒‫ܘ‬ኍଝጲሢᒜLjཀྵۣᏴᔢ঱ࡼણஹᆨࣞ
ሆLjஉᆨ‫ި્ݙ‬ਭ,261°Dࡼᔢࡍ૵ሢᒋă‫ݧ‬፿ሆ೰৛ါ
ଐႯNBY61990NBY619:ด‫ݝ‬৖੒ă
ఎਈႼ੒ᆐǖ
PMOSFET = IRMS_MOSFET x RON
______________________________________________________________________________________
15
NBY61990NBY619:
ၒྜྷᆬ݆ᓍገᎅΔW R )ᎅ࢟ྏह࢟፛໦*ਜ਼ΔW FTS )ᎅ࢟ྏ
FTS፛໦*ᔝ߅ăᔐ࢟ኹᆬ݆ࢀ᎖ΔWR ᎧΔWFTS ᒄਜ਼ăଣࢾ
ᎅFTSਜ਼࢟ྏह࢟Ⴥ፛໦ࡼၒྜྷ࢟ኹᆬ݆ॊܰᐴ61&ăᆐ
Ᏼၒྜྷ࣡૝ࡻ໐ᆃࡼ࢟ኹᆬ݆Lj‫ݧ‬፿ሆ೰৛ါభႯ߲Ⴥ
ኊࡼၒྜྷ࢟ྏᒋૺ໚FTSǖ
NBY61990NBY619:
3/3NI{Ă3Bଢ଼ኹቯᓞધ໭ดᒙ঱‫ܟ‬ఎਈ
໚ᒦǖ
‫ޡݗ‬
2
⎛ ΔI
×D⎞
IRMS _ MOSFET = (IOUT2 × D) + ⎜ P−P
⎟⎟
⎜
12
⎝
⎠
ΔJQ.Q ဵ࢟ঢ࢟ഗᆬ݆ࡼख़.ख़ᒋă
༤ધด‫ݝ‬৖ൈNPTGFUሿ੒ࡼ৖ൈᆐǖ
PSW =
VIN × IOUT × (tR + tF ) × fSW
4
uS ਜ਼uG ဵᏴTPVSDF࣡‫ހ‬೟ࡼด‫ݝ‬NPTGFUࡼ࿟ဍਜ਼ሆଢ଼
ဟମă
ఎਈஸზ࢟ഗᐆ߅ࡼ৖੒ǖ
PQ = VIN x ISW
(MAX5088)
NBY61990NBY619:ࡼఎਈஸზ࢟ഗ)JTX*ན௼᎖ఎਈຫൈă
Ᏼ৊ࢾࡼຫൈሆLjJTX ࡼནᒋ༿‫ݬ‬୅࢜ቯ৔ᔫᄂቶ‫ݝ‬ॊă
࣪NBY619:౶ႁLjఎਈ࢟ഗથ۞౪ᄴ‫ݛ‬ᑳഗ໭NPTGFU
ࡼᐜ૵དࣅ࢟ഗ)J TX.EM*ăJ TX.EM ࡼࡍቃན௼᎖ᄴ‫ݝ‬ᑳഗ
໭NPTGFUࡼᔐᐜ૵࢟੗)Rh.EM*ਜ਼ఎਈຫൈǖ
PQ = VIN x (ISW + ISW-DL)
(MAX5089)
ISW-DL = Qg-DL x fSW
໚ᒦRh.EM ဵWHT > 6Wဟᄴ‫ݛ‬ᑳഗ໭NPTGFUࡼᐜ૵࢟੗ă
໭ୈࡼᔐ৖੒ᆐǖ
PTOTAL = PMOSFET + PSW + PQ
‫ݧ‬፿ሆ೰৛ါଐႯ਌በࡼᆨဍǖ
TJ = TC + (PTOTAL x θJC)
θKD ဵ਌በ.਌ఫེᔜLj໚ᒋᆐ2/8°D0Xă໚ᒦUD ဵ਌ఫᆨ
ࣞLjऎUK ဵஉᆨ૞਌በᆨࣞă਌ఫ.ણஹࡼེᔜན௼᎖QDC
ሶᒲᆍણஹྲེࡼ቉ൈă୓࢏‫ࡼݝ‬ൡഴ੆๤੆୻ࡵࡍෂ
૩঄ᄵHOE‫ށ‬ăྙਫ਌በᆨࣞࡉࡵ,281°DLjNBY61990
NBY619:ਈࣥLjᒇࡵ਌በᆨࣞದས36°D‫ݣ‬ᒮቤ໪ࣅă
16
NBY61990NBY619:ด‫ݝ‬௥ᎌጙৈోࡴᇙ‫ތ‬हࡍ໭Lj໚न
ሤၒྜྷ࣡)GC*ਜ਼ၒ߲࣡)DPNQ*భ፿౶஠ቲᅪ‫ݝ‬ຫൈ‫ޡݗ‬ă
NBY61990NBY619:௥ᎌഉ૚ࡼᅪ‫ޡݗݝ‬৖ถਜ਼୷঱ࡼఎ
ਈຫൈLjဧࡻၒ߲൉݆Ꮔୈ௥ᎌৎࡍࡼኡᐋ᎜࢐Ljᄂܰ
ဵၒ߲࢟ྏࡼኡᐋă࣪᎖߅‫۾‬ැঢࡼ።፿౶ႁLjభဧ፿
঱FTSࡼി࢟ஊ࢟ྏăऎ࣪᎖Ꮔୈߛࡁැঢࡼ።፿౶ႁLj
భᏴၒ߲࣡‫ݧ‬፿ࢅFTSࡼᶉ࢟ྏ૞ჿࠣ࢟ྏă
Ᏼ࿸ଐ‫ޡݗ‬Ꮔୈᒄ༄Lj၅ሌ።‫ږ‬ᑍ࣪ၒ߲ᆬ݆ĂᏄୈߛ
ࡁጲૺᏄୈ߅‫ࡼ۾‬ገཇኡᐋཝ‫ݝ‬ᇄᏎ৖ൈᏄୈă໚ࠨLj
ኡᐋ‫ޡݗ‬Ꮔୈጲ૝ࡻჅ໐ᆃࡼ‫ܕ‬ણࡒ౑ਜ਼ሤᆡᎽࣞăྙ
ਫၒ߲࢟ྏFTSࡼഃ࢛ຫൈ)g[FTS*ࢅ᎖࡝ᆡᐐፄຫൈ)gD*Lj
‫ݧ‬፿଼࡝ࡼ2ഃ࢛Lj3૵࢛)JJቯ*‫ޡݗ‬ऱါăࡩg[FTS ঱᎖gD
ဟLj‫ݧ‬፿3ഃ࢛Lj3૵࢛)JJJቯ*‫ޡݗ‬ऱါă
ࡩg[FTS = gD ဟLj‫ݧ‬፿‫ݛ‬ᒾ2౶ଐႯ‫ޡݗ‬ᆀ൥Ꮔୈ‫ݬ‬ၫă
‫ݛ‬ᒾ2 )‫ݬ‬୅ᅄ4*
ଐႯg[FTS ૺgMD ၷ૵࢛ǖ
fZESR =
fLC =
1
2π × ESR × COUT
1
2π × L × COUT
ଐႯ࡝ᆡᐐፄຫൈǖ
f
fC = SW
20
ྙਫg[FTS ࢅ᎖gD ༦୻தgMDLjᐌ‫ݧ‬፿JJቯ‫ޡݗ‬ᆀ൥Lj໚ᒦ
SGDGᄋ৙ጙৈᒦຫഃ࢛)gnje-{fsp*LjSGDDGᄋ৙ጙৈ঱ຫ૵࢛ă
______________________________________________________________________________________
3/3NI{Ă3Bଢ଼ኹቯᓞધ໭ดᒙ঱‫ܟ‬ఎਈ
GM =
ଐႯMDၷ૵࢛ຫൈgMDǖ
VIN
ESR
V
×
× FB
VOSC ESR+ (2π × fc × L) VOUT
໚ᒦWPTD ဵ2WQ.Q ቓຸᑩ७LjWGC > 1/7Wă
fLC =
CF =
1
2π × RF × fLC
SG ≥ 21lΩă
ଐႯ෹‫࡝ܪ‬ᆡᐐፄຫൈgD ࣪።ࡼDBǖ
CA =
2π × fC × L × COUT × VOSC
VIN × RF
Ᏼg[FTS ࠀहᒙጙৈ૵࢛ă
ᏴgQ > 1/6 y gTX ࠀ୐ೂጙৈ঱ຫ૵࢛ăჅጲDDG ᆐǖ
CCF =
( fP1 =
1
π × RF × fSW
RA =
‫ݛ‬ᒾ3! )‫ݬ‬୅ᅄ5*
‫ݧ‬፿ࢅFTSࡼჿࠣ࢟ྏᔫᆐၒ߲࢟ྏဟLjFTSຫൈገ‫܈‬෹
‫࡝ܪ‬ᆡᐐፄຫൈ)g D*঱ࡻࣶăᑚဟLjᅎୀဧ፿JJJቯ‫ޡݗ‬ă
JJJቯ‫ޡݗ‬భᄋ৙ࢅຫ૵࢛)≈ED*ਜ਼ၷ૵࢛.ഃ࢛࣪ăഃ࢛ਜ਼
૵࢛ࡼᆡᒙ።ဧgD ຫൈࠀࡼሤᆡᎽࣞࡉࡵ໚ख़ᒋă
fC fP
=
=5
ྦဧ fZ fC
Ljᐌຫൈᆐg ဟభࡻࡵᏖ71°ࡼሤᆡᎽࣞă
D
‫ݙ‬ਭLjᆐ೫‫ܜ‬඾ᄟୈᆮࢾቶᆰᄌLj።୓ೝৈഃ࢛हᒙᏴ
ၷ૵࢛૞ࢅ᎖ၷ૵࢛ࡼᆡᒙLjᑚጙ࢛ऻ‫ޟ‬ᒮገă
၅ሌLjኡᐋ࡝ᆡᐐፄຫൈLjጲ൸ᔗǖ
f
fC ≤ SW
20
1
2π × R F × C F
1
2π × 0.75 × fLC × RF
CF =
૞
ᏴMDၷ૵࢛ࠀ૞ࢅ᎖MDၷ૵࢛ࠀ୐ೂጙৈഃ࢛ǖ
2π × L × COUT
fZ =
ᏴgD ຫ࢛ሆࡼᔐણവᐐፄ።ࢀ᎖2ǖ
GM = GE/A = 1
VOSC (ESR + 2π × fC × L)VOUT
VFB × VIN × gm × ESR
1
Ᏼ1/86 y gMD ຫ࢛हᒙጙৈഃ࢛g[Lj໚ᒦǖ
ᏴgD ຫ࢛ሆࡼోࡴᇙ‫ތ‬हࡍ໭ᐐፄᆐǖ
GE/A = gm x RF
RF =
NBY61990NBY619:
ଐႯ࡝ᆡᐐፄຫൈሆࡼࢯᒜᐐፄ)HN*ă
1
)
2π × R A × C A
1
2π × fZESR × C A
Ᏼ 1/3 y gD ૞ gMD ೝᑗᒦ୷ࢅࡼຫ࢛ᆡᒙहᒙ഍ጙৈ
ഃ࢛g[3ă
R1 =
1
− RA
2π × fZ2 × C A
Ᏼఎਈຫൈࡼ203ࠀLjहᒙ࢒औৈ૵࢛ă
(f P2 =
CCF =
1
)
2π × RF × CCF
CF
(2π × 0.5 × fSW × RF × CF ) -1
______________________________________________________________________________________
17
NBY61990NBY619:
3/3NI{Ă3Bଢ଼ኹቯᓞધ໭ดᒙ঱‫ܟ‬ఎਈ
VOUT
R1
COMP
gm
R2
VREF
CCF
RF
CF
ᅄ4/! JJቯ‫ޡݗ‬ᆀ൥
VOUT
CCF
RA
R1
CF
RF
CA
gm
R2
COMP
VREF
ᅄ5/! JJJቯ‫ޡݗ‬ᆀ൥
18
______________________________________________________________________________________
3/3NI{Ă3Bଢ଼ኹቯᓞધ໭ดᒙ঱‫ܟ‬ఎਈ
ࡩNBY61990NBY619:৔ᔫ᎖ᐅဉણஹဟLjభጲᄰਭࢯஂ
఼ᒜ໭ࡼ‫ޡݗ‬౶খ࿖ᇹᄻࡼᐅဉጴᒜቶถăᄂܰဵẮ੝
ࡵनౣૄവࡼ঱ຫᐅဉ્፛໦ᐴహ‫ࣅ࣌܈‬ă໚ᒦጙৈஊ
௼ऱ‫ဵښ‬ଢ଼ࢅ࡝ᆡᐐፄຫൈ)‫ݬ‬୅‫ݝޡݗ‬ॊ*ă
QDC௜ᒎฉ
றቦࡼQDC‫ݚ‬௜ဵ૝ࡻࢅఎਈႼ੒ਜ਼ۣᑺ࢟വ‫ݙ‬၊ᐅဉছ
ཷĂᆮࢾ৔ᔫࡼਈ୆ăᆐࡉࡵৎੑࡼᐅဉጴᒜቶถLj።
஧భถဧ፿ࣶ‫ۇށ‬ă೜ੑࡼQDC‫ݚ‬௜።ᔥክጲሆᏇᐌǖ
2* ୓ൡഴ੆๤੆୻ᒗJDሆऱࡼࡍෂ૩঄ᄵ‫ށ‬ăᆐ೫ถᎌ
቉खિ঄ᄵཌᔫᆐQDCਜ਼ᒲᆍણஹᒄମེୣધ໭ࡼ቉
ถLj።ဧᆡ᎖QDCࢻ‫ࡼށ࢏ૺށ‬঄ᄵཌᎮߠॊ۩ഴă
‫ݙ‬ገ୓ൡധ੆๤঄ᄵ‫ށ‬ᒇ୻ೌ୻ᒗJDሆऱࡼTHOE )፛
୭21*ăᏴW,๬വ࢟ྏࡼऩૄ࣡Lj‫ڳ‬ক঄ᄵ‫ށ‬ᎧTHOE
ೌ୻Ᏼጙ໦ă
3* ୓৖ൈᏄୈĂࡍ࢟ഗᄰവᎧැঢࡼෝผ࢟വ৆ಭఎă
4* ࡍ࢟ഗᄰവ።࣢ጙቋLjᄂܰဵᏴ୻࢐࣡ăᑚ࣪ဣሚᆮ
ࢾĂᇄ࣌ࣅ৔ᔫᎄ໚ᒮገă
5* THOEਜ਼QHOEࡼೌ୻࢛።ణதJDএதWM ᎧW,঱ຫ๬
വ࢟ྏࡼऩૄ࣡ăऎ‫ݙ‬ገᏴ໚჈ྀੜ࢐ऱೌ୻औᑗă
6* ࢟Ꮞሣਜ਼ঌᏲೌሣ።࣢ጙቋLjᑚ࣪᎖ဣሚ঱቉ൈऻ‫ޟ‬
ᒮገăဧ፿঄ᄵ‫ࡼ੿୷ށ‬QDCభᄋ঱൸Ᏺ቉ൈă
7* ཀྵۣGCᎧDPVU ᒄମࡼनౣೌሣ࣢༦ᒇă
8* ঱Ⴅఎਈஂ࢛)CTU0WEELjTPVSDF*ࡼ‫ݚ‬ሣ።Ꮠಭැঢ
ࡼෝผ࢟വཌᎮ)CZQBTTĂDPNQĂGCਜ਼PTD*ăဧ፿
QDCด‫ࡼݝ‬THOE‫ށ‬ᔫᆐFNJື܎‫ށ‬LjభဧJDĂनౣॊ
ኹ໭ਜ਼ෝผ๬വ࢟ྏ඾၊६࿴ᐅဉছཷă
‫ݚ‬௜‫ݛ‬ᒾ
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______________________________________________________________________________________
19
NBY61990NBY619:
খ࿖ᐅဉጴᒜቶถ
20
PGND
VIN
+
ᅄ6/! NBY6199ଢ଼ኹ๼ᒙ
______________________________________________________________________________________
SGND
R2
6.04kΩ
1%
PGND
R3
750Ω
1%
R1
27.4kΩ
1%
C5
330pF
VOUT
C1
47μF
35V
VIN
C8
0.1μF
C6
0.1μF
VL
C9
4.7μF
R5
6.04kΩ
1%
VIN
C3
1200pF
R4
10kΩ
1%
C7
0.22μF
C4
22pF
C2
10μF
10
8
11
7
4
3
2
1
SGND
VL
OSC
SYNC
RESET
EN
CKO
SOURCE
BST/VDD
MAX5088
BYPASS
PGND
V+
FB
COMP
DRAIN
DRAIN
9
12
15
13
14
16
JU1
R8
10kΩ
R7
15Ω
VL
VL
D2
C10
0.1μF
D1
VL
R10
10kΩ
R9
10kΩ
L1
4.7μH
C11
22μF
C12
0.1μF
VOUT
SYNC
SGND
PGND
VOUT
PGOOD
NBY61990NBY619:
3/3NI{Ă3Bଢ଼ኹቯᓞધ໭ดᒙ঱‫ܟ‬ఎਈ
PGND
VIN
+
SGND
R2
6.04kΩ
1%
R3
750Ω
1%
R1
27.4kΩ
1%
PGND
C5
330pF
VOUT
C1
47μF
35V
VIN
C8
0.1μF
C6
0.1μF
VL
C9
4.7μF
R5
6.04kΩ
1%
VIN
C3
1200pF
R4
10kΩ
1%
C7
0.22μF
C4
22pF
C2
10μF
10
8
11
7
4
3
2
1
SGND
VL
OSC
EN
DL
SOURCE
BST/VDD
SYNC
PGOOD
MAX5089
BYPASS
PGND
V+
FB
COMP
DRAIN
DRAIN
9
12
15
13
14
16
R6
4.7Ω
R7
15Ω
JU1
R8
10kΩ
VL
3
N1
C10
0.1μF
D1
VL
R10
10kΩ
4
1 256
R9
10kΩ
D2
C11
22μF
L1
4.7μH
C12
0.1μF
VOUT
SYNC
SGND
PGND
VOUT
PGOOD
NBY61990NBY619:
VL
3/3NI{Ă3Bଢ଼ኹቯᓞધ໭ดᒙ঱‫ܟ‬ఎਈ
ᅄ7/! NBY619:ଢ଼ኹ๼ᒙ
______________________________________________________________________________________
21
VIN
CIN
V+
V+
DRAIN
DRAIN
OUTPUT1
SOURCE
SOURCE
OUTPUT2
DUTY CYCLE = 50%
SYNC
CLKIN
SYNC
CLKOUT
SLAVE
MASTER
SYNC
CLKOUT
(MASTER)
SOURCE
(MASTER)
SYNCPHASE
SOURCE
(SLAVE)
CLKOUTPHASE
ᅄ8/! ᄴ‫ݛ‬ᓞધ໭
````````````````````````````፛୭๼ᒙ)ኚ*
PGND
SGND
DL
12
11
10
9
SYNC 13
PGOOD 14
MAX5089
BST/VDD 15
*EXPOSED PAD.
22
2
3
4
FB
1
COMP
EP*
+
DRAIN
EN 16
```````````````````````````````በຢቧᇦ
PROCESS: BiCMOS
SOURCE
TOP VIEW
DRAIN
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8
VL
7
V+
6
BYPASS
5
OSC
THIN QFN
5mm x 5mm
______________________________________________________________________________________
3/3NI{Ă3Bଢ଼ኹቯᓞધ໭ดᒙ঱‫ܟ‬ఎਈ
QFN THIN.EPS
______________________________________________________________________________________
23
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(‫۾‬ၫ௣ᓾ೯ᄋ৙ࡼॖᓤᅄభถ‫ဵݙ‬ᔢதࡼਖৃLjྙኊᔢதࡼॖᓤᅪቯቧᇦLj༿‫އ‬ኯ www.maxim-ic.com.cn/packagesă)
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24 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600
© 2006 Maxim Integrated Products
Printed USA
ဵ Nbyjn!Joufhsbufe!Qspevdut-!Jod/ ࡼᓖ‫ݿ‬࿜‫ܪ‬ă
19-4001; Rev 0; 2/06
MAX5089评估板
____________________________________ 特性
MAX5089评估板(EV kit)是经过完全安装与测试的电路板，
用于评估集成了内部高边n沟道MOSFET的同步buck转换
器MAX5089。MAX5089评估板配置为buck转换器，工作
于5.5V至16V宽输入电压范围，3.3V输出时可提供高达2A
的电流。
♦ 5.5V至16V输入电压范围
MAX5089具有SYNC输入，提供外部频率同步功能，可用
于噪声敏感系统；PGOOD输出用于上电时的系统复位。
评估板提供了用于评估SYNC和PGOOD功能的PCB接头，
MAX5089可工作在-40°C至+125°C汽车级温度范围。
♦ 高达90%的效率(300kHz时)
♦ Buck转换器，提供3.3V、2A输出
♦ 250kHz至2.2MHz可调开关频率
♦ 内置高边开关
♦ SYNC输入和PGOOD输出
♦ 过流、过热保护
♦ 经过完全安装和测试
_________________________________ 定购信息
PART
TEMP RANGE
IC PACKAGE
MAX5089EVKIT
0°C to 70°C*
16 TQFN
*PCB额定温度。
______________________________________________________________________________元件列表
DESIGNATION
QTY
C1
1
C2
1
C3
1
C4
1
C5
C6, C8, C10,
C12
C7
C9
1
4
1
1
DESCRIPTION
47µF, 35V electrolytic capacitor
(6.3mm x 6.0mm)
Sanyo 35CE47KX
10µF ±20%, 25V X5R ceramic
capacitor (1210)
Taiyo Yuden TMK325BJ106M
1200pF ±5%, 50V C0G ceramic
capacitor (0603)
Murata GRM1885C1H122J
22pF ±5%, 100V C0G ceramic
capacitor (0603)
Murata GRM1885C2A220J
330pF ±5%, 50V C0G ceramic
capacitor (0603)
Murata GRM1885C1H331J
0.1µF ±10%, 25V X7R ceramic
capacitors (0603)
Murata GRM188R71E104K
0.22µF ±10%, 10V X5R ceramic
capacitor (0603)
Murata GRM188R61A224K
4.7µF ±10%, 6.3V X5R ceramic
capacitor (0603)
Murata GRM188R60J475K
DESIGNATION
QTY
DESCRIPTION
22µF ±20%, 6.3V X5R ceramic
capacitor (1206)
Murata GRM31CR60J226M
500mA, 40V Schottky diode
(SOD-123)
Central Semiconductor CMHSH5-4
C11
1
D1
1
D2
1
1A, 20V Schottky diode (SOD-123F)
Central Semiconductor CMMSH1-20
D3
1
Not installed, Schottky diode (SMB)
Diodes Inc B340LB recommended
JU1
1
2-pin header
L1
1
4.7µH, 3.4A inductor
Sumida CDRH8D28-4R7
N1
1
R1
1
30V, 5.1A n-channel MOSFET
(SuperSOT-6)
Fairchild Si3456DV
27.4kΩ ±1% resistor (0603)
R2, R5
2
6.04kΩ ±1% resistors (0603)
R3
1
750Ω ±1% resistor (0603)
R4
1
10kΩ ±1% resistor (0603)
R6
1
4.7Ω ±5% resistor (0603)
R7
1
15Ω ±5% resistor (0603)
________________________________________________________________ Maxim Integrated Products
1
本文是Maxim正式英文资料的译文，Maxim不对翻译中存在的差异或由此产生的错误负责。请注意译文中可能存在文字组织或
翻译错误，如需确认任何词语的准确性，请参考 Maxim提供的英文版资料。
索取免费样品和最新版的数据资料，请访问Maxim的主页：www.maxim-ic.com.cn。
评估板：MAX5088/MAX5089
____________________________________ 概述
评估板：MAX5088/MAX5089
MAX5089评估板
____________________________ 元件列表(续)
5)
连接一个数字电压表至PGOOD和SGND PCB焊盘。
DESCRIPTION
6)
打开电源。
DESIGNATION
QTY
R8, R9
2
10kΩ ±5% resistors (0603)
7)
设置电源电压至12V。
R10
1
0Ω ±5% resistor (0603)
8)
使能并设置电负载至2A。
U1
1
MAX5089ATE+ (16-pin TQFN with
EP 5mm x 5mm)
9)
确认连接至VOUT的电压表测量值为3.3V。
—
1
Shunt
—
1
MAX5089 EV kit board
10) 确认连接至PGOOD的电压表测量值约5.2V。
_______________________________ 详细说明
________________________________ 快速入门
推荐设备
•
20V可调、3A电源
•
两个可吸收2A电流的电负载(例如，HP 6060B)
•
两个电压表
MAX5089评估板经过完全安装和测试。按照如下步骤检
查电路板的工作状况。
MAX5089评估板使用MAX5089 buck转换器IC (U1)实现降
压型DC-DC转换电路。MAX5089评估板工作于5.5V至16V
输入电压范围，并配置为3.3V输出，可提供高达2A的电
流。MAX5089 IC内置低RDSON 的MOSFET，具有很高的效
率以及较低的整体系统成本。MAX5089评估板的开关频
率预设为2MHz。MAX5089 SYNC输入可用于转换器与外
部数字时钟的同步。MAX5089评估板通过PCB焊盘输出
PGOOD信号，该信号可用于上电时的系统复位。MAX5089
还具有过流、欠压锁定以及热关断保护功能。
设置输出电压(VOUT)
步骤
在完成所有连接之前，请勿打开电源。
1)
确认跳线JU1 (U1使能)的引脚之间没有安装短路器。
2)
连接电源正端至评估板的VIN PCB焊盘。电源地连接
至GND PCB焊盘。
3)
连接电负载正端至评估板的VOUT PCB焊盘。电负载
地连接至GND PCB焊盘。
4)
连接一个数字电压表至VOUT和PGND PCB焊盘。
MAX5089评估板buck转换器输出电压通过电阻R1和R2设
置成3.3V。更换电阻R1和R2，可以将评估板的输出电压
VOUT 重新设定在0.6V至(0.8 x VIN)之间。利用下面的公式
将输出电压重新设定到所期望的值：
R1
R2 =
⎡ VOUT ⎤
⎢ 0.6 − 1⎥
⎣
⎦
其中，VOUT 为所期望的输出电压，单位为伏特。R1典型
值为27.4kΩ。
_____________________________________________________________________________ 元件供应商
SUPPLIER
PHONE
WEBSITE
Central Semiconductor
631-435-1110
Diodes Inc.
805-446-4800
www.centralsemi.com
www.diodes.com
Fairchild
888-522-5372
www.fairchildsemi.com
Murata
770-436-1300
www.murata.com
Sanyo Electronic Device
619-661-6322
www.sanyovideo.com
Sumida
847-545-6700
www.sumida.com
Taiyo Yuden
800-348-2496
www.t-yuden.com
注：与元件供应商联系时，请指明您正在使用的是MAX5088/MAX5089评估板。
2
_______________________________________________________________________________________
MAX5089评估板
使能引脚(EN)
MAX5089 EN输入用来使能MAX5089 IC。MAX5089评估板
采用跳线JU1来设置EN输入。EN引脚为高电平时，使能
MAX5089 IC；反之，EN引脚为低电平时，禁止MAX5089 IC。
跳线JU1的功能请参考表1。
表1. EN跳线JU1的功能
SHUNT
LOCATION
Not installed
Installed
EV KIT
FUNCTION
EN PIN
Connected to VL
U1 is enabled
Connected to GND
U1 is disabled
电源就绪输出(PGOOD)
MAX5089评估板通过PCB焊盘输出MAX5089的电源就绪信
号。PGOOD输出可用做上电期间的系统复位信号。VOUT
上升至超出标称设置电压的92.5%后，PGOOD变为高电平。
PGOOD通过电阻R9上拉至VL (5.2V)。VOUT下降至低于
标称电压的92.5%时，PGOOD被拉低。
同步输入(SYNC)
评估板的SYNC PC焊盘用于同步MAX5089与外部数字时
钟，同步频率范围为200kHz至2.2MHz。当采用外部数字
时钟驱动SYNC时，MAX5089同步至外部时钟的上升沿。
评估板中，SYNC引脚通过一个0Ω电阻R10短接至SGND。
要使用SYNC功能时，移走电阻R10。未使用SYNC时短接
SYNC引脚至地(R10 = 0Ω)。高阻引脚SYNC悬空会导致转
换器的振荡。
R5 =
125 × 108 Ω / s
fSW
其中，fSW 为期望的开关频率，单位为赫兹。
将MAX5089评估板的开关频率设置成新的值，可能需要
替换电感L1以及/或电容C2、C7和C11。为选择适当的元
件值，请参考MAX5089 IC数据资料中的应用信息和振荡
器/同步(SYNC)/时钟输出(CLKOUT)部分。
补偿网络
MAX5089 IC可以对内部误差放大器进行灵活的外部补偿，
以保证不同应用情况下的稳定性。选择适当的电阻 R1、
R2、R3、R4和电容C3、C4、C5，可以对MAX5089评估板
电路进行补偿。重新配置特定要求下的补偿网络，请参
考MAX5089 IC数据资料中的补偿部分。
评估MAX5088
评估板：MAX5088/MAX5089
将MAX5089评估板重新设定为新的输出电压时，可能需
要更新电感L1、电容C2和/或C11。最小输出电压还受限
于IC的最小可控导通时间。选择新的L1电感值、C2和C11
的电容值，请参考MAX5089 IC数据资料中的电感的选择、
输入电容和输出电容部分。
MAX5089 评估板还可用来评估 buck 转换器 MAX5088。
MAX5088为非同步buck转换器，需要一个低导通压降肖
特基二极管整流。评估时，应该将MAX5089换成MAX5088。
该器件的详细信息，请参考MAX5088 IC数据资料。评估
MAX5088 IC时，需要移除的或者替换的元件列表，请参
见表2。
表2. 评估MAX5088的替代元件
COMPONENT
DESIGNATION
DESCRIPTION
R6
Not installed—remove
N1
Not installed—remove
D2
Not installed—remove
D3
Diodes Inc B340LB—install
设置开关频率(OSC)
选择合适的电阻R5，可以重新设置MAX5089评估板的开
关频率。利用下面的公式来选择新的R5：
_______________________________________________________________________________________
3
4
PGND
VIN
+
PGND
R3
750Ω
1%
VOUT
C5
330pF
SGND
R2
6.04kΩ
1%
R1
27.4kΩ
1%
C1
47µF
35V
VIN
C8
0.1µF
VL
C9
4.7µF
R5
6.04kΩ
1%
VIN
C3
1200pF
C6
0.1µF
C7
0.22µF
C4
22pF
R4
10kΩ
1%
C2
10µF
10
8
5
6
11
7
4
3
2
1
SGND
VL
OSC
U1
EN
DL
SOURCE
BST/VDD
SYNC
PGOOD
MAX5089
BYPASS
PGND
V+
FB
COMP
DRAIN
DRAIN
9
12
15
13
14
16
JU1
R8
10kΩ
R6
4.7Ω
R7
15Ω
VL
VL
3
N1
C10
0.1µF
D1
R9
10kΩ
4
1 256
VL
D2
R10
0Ω
D3
OPEN
L1
4.7µH
C11
22µF
C12
0.1µF
VOUT
PGND
VOUT
SYNC
SGND
PGOOD
评估板：MAX5088/MAX5089
MAX5089评估板
图1. MAX5089评估板原理图
_______________________________________________________________________________________
MAX5089评估板
评估板：MAX5088/MAX5089
图2. MAX5089评估板元件布局—元件层
图3. MAX5089评估板PCB布局—元件层
图4. MAX5089评估板PCB布局—GND，第2层
图5. MAX5089评估板PCB布局—GND，第3层
_______________________________________________________________________________________
5
评估板：MAX5088/MAX5089
MAX5089评估板
图6. MAX5089评估板PCB布局—焊接层
MAXIM 北京办事处
北京 8328信箱 邮政编码 100083
免费电话：800 810 0310
电话：010-6211 5199
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