Operating Temperature Range. .......................... -40°C to +85°C
Junction Temperature Range ..........................................+150°C
Storage Temperature Range ............................ -65°C to +150°C
Lead Temperature (soldering, 10s) ................................. +300°C
Soldering Temperature (reflow)...................................... . +260°C
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.
Package Thermal Characteristics
(Note 1)
TQFN
Junction-to-Ambient Thermal Resistance (θ
JA
) ..........35°C/W
Junction-to-Case Thermal Resistance (θ
JC
) .................3°C/W
Note 1:
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to
www.maximintegrated.com/thermal-tutorial.
Electrical Characteristics
(V
IN
= 14V, V
BIAS
= 5V, C
BIAS
= 6.8µF, T
A
= T
J
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C under
normal conditions, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
Normal operation
t < 1s
FB rising (Note 3)
FB falling
V
EN1
= V
EN2
= 0V, T
A
= +25°C
V
EN1
= V
EN2
= 0V, T
A
= +125°C
Supply Current
I
IN
V
EN1
= 5V, V
OUT1
= 5V, V
EN2
= 0V;
V
EXTVCC
= 5V, no switching
V
EN2
= 5V, V
OUT2
= 3.3V; V
EN1
= 0V,
V
EXTVCC
= 3.3V, no switching
V
EN1
= V
EN2
= 5V, V
OUT1
= 5V, V
OUT2
=
3.3V, V
EXTVCC
= 3.3V, no switching
Buck 1 Fixed Output Voltage
Buck 2 Fixed Output Voltage
Output Voltage Adjustable Range
V
OUT1
V
OUT2
V
FB1
= V
BIAS
, PWM mode
V
FB1
= V
BIAS
, skip mode
V
FB2
= V
BIAS
, PWM mode
V
FB2
= V
BIAS
, skip mode
Buck 1, buck 2
4.95
4.95
3.234
3.234
1
+10
+5
+15
+10
8
20
30
20
25
5
5
3.3
3.3
40
µA
30
40
5.05
5.075
3.366
3.4
10
V
V
V
MIN
3.5
TYP
MAX
36
42
+20
+15
20
UNIT
SYNCHRONOUS STEP-DOWN DC-DC CONTROLLERS
Supply Voltage Range
Output Overvoltage Threshold
V
IN
V
%
www.maximintegrated.com
Maxim Integrated
│
3
MAX17232/MAX17233
3.5V–36V, 2.2MHz, Synchronous Dual Buck
Controller with 20µA Quiescent Current
Electrical Characteristics (continued)
(V
IN
= 14V, V
BIAS
= 5V, C
BIAS
= 6.8µF, T
A
= T
J
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C under
normal conditions, unless otherwise noted.) (Note 2)
PARAMETER
Regulated Feedback Voltage
Feedback Leakage Current
Feedback Line Regulation Error
Transconductance
(from FB_ to COMP_)
g
m
SYMBOL
V
FB1,2
I
FB1,2
T
A
= +25°C
V
IN
= 3.5V to 36V, V
FB
= 1V
V
FB
= 1V, V
BIAS
= 5V
MAX17233: DL_ low to DH_ high
Dead Time
MAX17233: DH_ low to DL_ high
MAX17232: DL_ low to DH_ high
MAX17232: DH_ low to DL_ high
Maximum Duty Cycle
Minimum On-Time
PWM Switching Frequency
Buck 2 Switching Frequency
t
ON(MIN)
f
SW
Buck 1, buck 2
Buck 1, buck 2
MAX17233
MAX17232
MAX17233ATIT+,
MAX17233BATIU+ only
MAX17233: R
FOSC
= 13.7kΩ,
V
BIAS
= 5V
MAX17232: R
FOSC
= 80.6kΩ,
V
BIAS
= 5V
Spread spectrum enabled
MAX17233: Minimum sync pulse of 100ns
MAX17232: Minimum sync pulse of 400ns
High threshold
Low threshold
V
LIMIT1,2
V
CS
– V
OUT
, V
BIAS
= 5V, V
OUT
≥ 2.5V
64
80
15
Buck 1 and buck 2, fixed soft-start time
regardless of frequency
2
6
180
V
IN
= 6V, V
LX_
= V
IN
, T
A
= +25°C
V
BIAS
= 5V, I
DH_
= -100mA
V
BIAS
= 5V, I
DH_
= +100mA
V
BIAS
= 5V, I
DL_
= -100mA
V
BIAS
= 5V, I
DL_
= +100mA
0.01
10
2
4
1.5
20
4
8
3
10
1.2
240
1.5
0.6
96
1.98
360
1
0.2
1/2f
SW
2.2
400
±6
2.4
1200
2.42
440
95
CONDITIONS
MIN
0.99
TYP
1.0
0.01
0.001
1200
35
60
60
100
98.5
50
2.2
1
%
ns
MHz
MHz
MHz
kHz
%
MHz
kHz
V
mV
mV
ms
°
µA
Ω
Ω
Ω
Ω
ns
2400
MAX
1.01
1
UNIT
V
µA
%/V
µS
Switching Frequency Accuracy
Spread-Spectrum Range
FSYNC INPUT
FSYNC Frequency Range
FSYNC Switching Thresholds
CS Current-Limit Voltage
Threshold
Skip Mode Threshold
Soft-Start Ramp Time
Phase Shift Between Buck1 and
Buck 2
LX1, LX2 Leakage Current
DH1, DH2 Pullup Resistance
DH1, DH2 Pulldown Resistance
DL1, DL2 Pullup Resistance
DL1, DL2 Pulldown Resistance
www.maximintegrated.com
Maxim Integrated
│
4
MAX17232/MAX17233
3.5V–36V, 2.2MHz, Synchronous Dual Buck
Controller with 20µA Quiescent Current
Electrical Characteristics (continued)
(V
IN
= 14V, V
BIAS
= 5V, C
BIAS
= 6.8µF, T
A
= T
J
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C under
normal conditions, unless otherwise noted.) (Note 2)
PARAMETER
PGOOD1, PGOOD2 Threshold
PGOOD1, PGOOD2 Leakage
Current
PGOOD1, PGOOD2 Startup
Delay Time
PGOOD1, PGOOD2 Debounce
Time
INTERNAL LDO: BIAS
Internal BIAS Voltage
BIAS UVLO Threshold
Hysteresis
External V
CC
THERMAL OVERLOAD
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
EN LOGIC INPUT
High Threshold
Low Threshold
Input Current
T
A
= +25°C
1.8
0.8
1
V
V
µA
(Note 4)
(Note 4)
+170
20
°C
°C
V
TH,EXTVCC
EXTVCC rising, HYST = 110mV
V
IN
> 6V
V
BIAS
rising
V
BIAS
falling
2.7
4.75
5
3.1
2.9
0.2
3.0
3.2
5.25
3.4
V
V
V
V
SYMBOL
P
GOOD_H
P
GOOD_F
CONDITIONS
% of V
OUT_
, rising
% of V
OUT_
, falling
V
PGOOD1,2
= 5V, T
A
= +25°C
Buck 1 and buck 2 after soft-start
is complete
Fault detection
8
MIN
85
80
TYP
90
85
0.01
64
20
50
MAX
95
90
1
UNIT
%
µA
Cycles
µs
Note 2:
Limits are 100% production tested at T
A
= +25°C. Limits over the operating temperature range and relevant supply voltage
range are guaranteed by design and characterization. Typical values are at T
A
= +25°C.
Note 3:
Overvoltage protection is detected at the FB1/FB2 pins. If the feedback voltage reaches overvoltage threshold of FB1/FB2 +
15% (typ), the corresponding controller stops switching. The controllers resume switching once the output drops below FB1/FB2
白光LED光衰原因之荧光粉性能的衰退 到目前，白光 LED、尤其是小功率白光 LED 的发光性能快速衰退已越来越为人们所认识。其实，盲目地夸大宣传，只能将 LED 行业引向歧途，不正视白光 LED 存在的问题，只能延缓白光 LED 应用的发展。只有正视问题、研究问题、尽早解决问题，白光 LED 才能健康、快速发展。 白光 LED 当前面临的一个主要问题就寿命问题。由于白光 LED 的价格尚很...[详细]
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