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参数资料
| 型号： | MAX1638EAG+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/16页 |
| 文件大小： | 0K |
| 描述： | IC STEP-DWN CTRLR HI-SPD 24-SSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,000 |
| 应用： | 控制器，Intel Pentium? II |
| 输入电压： | 4.5 V ~ 5.5 V |
| 输出数： | 1 |
| 输出电压： | 1.3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 24-SSOP |
| 包装： | 带卷 (TR) |
High-Speed Step-Down Controller with
Synchronous Rectification for CPU Power
Table 2. Output Voltage Adjustment
Table 3. LG Pin Adjustment Settings
Settings
D4 D3 D2
D1 D0
OUTPUT
VOLTAGE
(V)
COMPATIBILITY
LG
CONNECTED
TO:
AC LOAD-
REGULATION
ERROR
(%)
DC LOAD-
REGULATION
ERROR
(%)
TYPICAL
A E
(V GAIN /
I GAIN )
0
0
0
0
0
0
0
0
0
1
2.050
2.000
V CC
REF
2
1
0.2
0.1
2
4
0
0
0
1
0
1.950
Intel-compatible
GND
0.5
0.05
8
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
0
0
1
1
1
0
1
0
1
1.900
1.850
1.800
1.750
1.700
DAC codes
be between 0.1 to 0.5. A higher LIR value allows for
smaller inductors and better transient response, but
results in higher losses and output ripple. A good com-
promise between size and loss is a 30% ripple current
to load current ratio (LIR = 0.30), which corresponds to
V OUT ( IN ( MAX ) ? V OUT )
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
1.650
1.600
1.550
1.500
1.450
1.400
1.350
1.300
3.500
3.400
3.300
3.200
3.100
3.000
2.900
2.800
2.700
2.600
Continuation of
50mV increment
to 1.3V
Intel-compatible
DAC codes
a peak inductor current 1.15 times higher than the DC
load current.
V
L =
V IN ( MAX ) x f OSC x I OUT x LIR
where f is the switching frequency, between 300kHz and
1MHz; I OUT is the maximum DC load current; and LIR is
the ratio of AC to DC inductor current (typically 0.3). The
exact inductor value is not critical and can be adjusted to
make trade-offs among size, transient response, cost,
and efficiency. Although lower inductor values minimize
size and cost, they also reduce efficiency due to higher
peak currents. In general, higher inductor values
increase efficiency, but at some point resistive losses
due to extra turns of wire exceed the benefit gained from
lower AC current levels. Load-transient response can be
adversely affected by high inductor values, especially at
low (V IN - V OUT ) differentials.
The peak inductor current at full load is 1.15 x I OUT if the
previous equation is used; otherwise, the peak current
can be calculated using the following equation:
1
1
1
1
1
1
0
0
1
1
1
0
0
1
0
2.500
2.400
2.300
I PEAK = I OUT +
V OUT ( V IN ( MAX ) ? V OUT
2 f OSC x L x V IN ( MAX )
)
1
1
1
1
1
1
0
1
1
0
2.200
2.100
The inductor’s DC resistance is a key parameter for effi-
cient performance, and should be less than the current-
1
1
1
1
1
N/A
Shutdown
sense resistor value.
Specifying the Inductor
Three key inductor parameters must be specified:
inductance value (L), peak current (I PEAK ), and DC
resistance (R DC ). The following equation includes a
constant LIR, which is the ratio of inductor peak-to-
peak AC current to DC load current. Typically LIR can
Calculating the Current-Sense
Resistor Value
Calculate the current-sense resistor value according to
the worst-case minimum current-limit threshold voltage
(from the Electrical Characteristics ) and the peak
inductor current required to service the maximum load.
______________________________________________________________________________________
13
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