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| 型号： | MAX1672EEE-T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/11页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BOOST FIX/ADJ 16QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 降压（降压），升压（升压） |
| 输出类型： | 两者兼有 |
| 输出数： | 1 |
| 输出电压： | 3.3V，5V，可调 |
| 输入电压： | 1.8 V ~ 11 V |
| 电流 - 输出： | 300mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-QSOP |
Step-Up/Down DC-DC Converter
in QSOP Package
__________________Design Procedure
Output Voltage Selection
For fixed output voltages of 3.3V or 5V, connect 3/ 5 to
PS or GND and connect FB to GND (Table 2).
INPUT
1.8V TO 11V
L1
10 μ H
Alternatively, adjust the output voltage from 1.25V to
5.5V by connecting two resistors, R1 and R2 (Figure 2),
which form a voltage divider between OUT and FB.
C1
100 μ F
R3
IN
PGI
LX
PS
Choose resistor values as follows:
R1 = R2[(V OUT / V REF ) -1]
where V REF = 1.25V. Since the input bias current at FB
has a maximum value of 50nA, R1 and R2 can be large
ON
OFF
R4
ONA
MAX1672
OUT
C2
100 μ F
1.25V TO
5.5V OUTPUT
with no significant accuracy loss. Choose R2 in the
100k ? to 270k ? range and calculate R1 using the
above formula. For 1% error, the current through R1
ON
OFF
ONB
3/5
R1
R5
1M ?
C4
4.7 μ F
should be at least 100 times FB’s bias current.
0.5A
0.8A
ILIM
PG0
LOW-BATTERY-
Whenever the voltage at FB exceeds 70mV above
GND, the state of the 3/ 5 pin is ignored. Connect 3/ 5 to
GND when adjusting V OUT with a resistor divider. Never
leave 3/ 5 unconnected.
C3
0.1 μ F
REF
PGND
FB
GND
R2
DETECTOR
OUTPUT
Low-Battery Detection
The MAX1672 contains a comparator for low-battery
( V IN(min) SWITCH ) 2 t
detection. If the voltage at PGI falls below V REF (typical-
ly 1.25V), the open-drain comparator output ( PGO )
goes high. Hysteresis is typically 30mV. Set the low-
battery detector’s threshold with resistors R3 and R4
(Figure 2) using the following equation:
R3 = R4[(V PGT / V REF ) -1]
where V PGT is the desired threshold of the low-battery
detector and V REF = 1.25V. Since the input bias current
at PGI has a maximum value of 50nA, R3 and R4 can
be large to minimize input loading with no significant
accuracy loss. Choose R4 in the 100k ? to 270k ? range
and calculate R3 using the above formula. For 1%
error, the current through R3 should be at least 100
times PGI’s bias current.
The PGO output is open-drain and should be pulled
high with external resistor R5 for normal operation. If the
low-battery comparator is not used, connect PGI and
PGO to GND.
Table 2. Output Voltage Control
Figure 2. Adjustable Output Voltage Configuration
Inductor Selection
A 10μH inductor performs well in most MAX1672 appli-
cations. Smaller inductor values typically offer a smaller
physical size for a given series resistance, but may
increase switching losses. Larger inductor values
exhibit higher output current capability and larger phys-
ical dimensions for a given series resistance. For opti-
mum performance, choose an inductor value from
Table 3 or by using the following equation:
( V OUT + V DIODE ) t OFF < L
I LIM
+ V
< ON (max)
I LIM
where I LIM is the peak switch-current limit, which is
0.8A for I LIM = PS and 0.5A for I LIM = GND.
3/ 5
0
1
X
FB
GND
GND
>70mV
V OUT (V)
+5
+3.3
+1.25 to +5.5
The inductor ’s incremental saturation current rating
should also be greater than the peak switch-current
limit. However, it is generally acceptable to bias most
inductors into saturation by as much as 20% with slight-
ly reduced efficiency. The inductor’s DC resistance sig-
nificantly affects efficiency. See Tables 4 and 5 for a list
of suggested inductors and suppliers.
8
_______________________________________________________________________________________
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