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参数资料
| 型号： | MAX1692EUB |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 0.6A 10UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.25 V ~ 5.5 V |
| 输入电压： | 2.7 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 750kHz |
| 电流 - 输出： | 600mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 10-µMAX |
| 其它名称： | Q816058 |
Low-Noise, 5.5V-Input,
PWM Step-Down Regulator
Capacitor Selection
Choose input- and output-filter capacitors to service
inductor currents with acceptable voltage ripple. The
input-filter capacitor also reduces peak currents and
noise at the voltage source. In addition, connect a low-
ESR bulk capacitor (>10μF suggested) to the input.
Select this bulk capacitor to meet the input ripple
requirements and voltage rating, rather than capacitor
size. Use the following equation to calculate the maxi-
mum RMS input current:
I RMS = I OUT [V OUT (V IN - V OUT )] 1/2 · V IN
When selecting an output capacitor, consider the out-
put-ripple voltage and approximate it as the product of
the ripple current and the ESR of the output capacitor.
V RIPPLE = [V OUT (V IN - V OUT )] /
[2 · f OSC (L) (V IN )] · ESR C2
where ESR C2 is the equivalent-series resistance of the
output capacitor.
The MAX1692’s loop gain is relatively low, enabling the
use of small, low-value output filter capacitors. Higher
values provide improved output ripple and transient
response. Lower oscillator frequencies require a larger-
value output capacitor. When PWM/PFM is used, verify
capacitor selection with light loads during PFM opera-
tion, since output ripple is higher under these condi-
tions. Low-ESR capacitors are recommended.
Capacitor ESR is a major contributor to output ripple
(usually more than 60%). Ordinary aluminum-electrolyt-
ic capacitors have high ESR and should be avoided.
Low-ESR aluminum-electrolytic capacitors are accept-
able and relatively inexpensive. Low-ESR tantalum
capacitors are better and provide a compact solution
ESR values are met:
C2 > 2V REF (1 + V OUT /V IN(MIN) ) / (V OUT · R SENSE · f OSC )
R ESR < (R SENSE )(V OUT ) / (V REF )
where C2 is the output filter capacitor, V REF is the inter-
nal reference voltage of 1.25V, V IN (min) is the minimum
input voltage (2.7V), R SENSE is the internal sense resis-
tance of 0.1 ? , and f OSC is the internal oscillator fre-
quency (typically 750kHz). These equations provide the
minimum requirements. The value of C2 may need to
be increased for operation at duty-cycle extremes.
Tables 1 and 2 provide recommended inductor and
capacitor sizes at various external sync frequencies.
Table 3 lists suppliers for the various components used
with the MAX1692.
Standard Application Circuits
Figures 2 and 3 are standard application circuits opti-
mized for power and board space respectively. The cir-
cuit of Figure 2 is the most general of the two, and
generates 1.8V at 600mA.
The circuit of Figure 3 is optimized for smallest overall
size. Cellular phones are using low voltage for base-
band logic and have critical area and height restric-
tions. This circuit operates from a single Li-ion battery
(2.9V to 4.5V) and delivers up to 200mA at 1.8V. It uses
small ceramic capacitors at the input and output and a
tiny chip inductor such as the NLC322522T series from
TDK. With the MAX1692 in a 10-pin μMAX package, the
entire circuit can fit in only 60mm 2 and have less than
2.4mm height.
for space-constrained surface-mount designs. Do not
exceed the ripple-current ratings of tantalum capaci-
tors. Ceramic capacitors have the lowest ESR overall,
and OS-CON ? capacitors have the lowest ESR of the
high-value electrolytic types.
It is generally not necessary to use ceramic or OS-CON
capacitors for the MAX1692; consider them only in very
compact, high-reliability, or wide-temperature applica-
tions where the expense is justified. When using very-
low-ESR capacitors, such as ceramic or OS-CON,
check for stability while examining load-transient
response. The output capacitor is determined by ensur-
V IN
+2.9V TO +4.5V
C5
4.7 μ F
ON / OFF
C4
0.1 μ F
IN
BP
MAX1692
SHDN
REF
LIM
LX
FB
L1
10 μ H
C5
47pF
V OUT = 1.8V @ 200mA
C2
10 μ F 10 μ F
R1
138k
R2
ing that the minimum capacitance value and maximum
SYNC/
301k
PWM
GND
PGND
OS-CON is a trademark of Sanyo Corp.
Figure 3. Miniaturized 200mA Output Circuit Fits in 60mm 2
_______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1692EUB+ | 功能描述:直流/直流开关调节器 5.5V PWM Step-Down Regulator RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX1692EUB+T | 功能描述:直流/直流开关调节器 5.5V PWM Step-Down Regulator RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX1692EUB-T | 功能描述:直流/直流开关调节器 5.5V PWM Step-Down Regulator RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX1692EVKIT | 制造商:Maxim Integrated Products 功能描述:LOW-NOISE, 5.5V-INPUT, PWN STEP-DOWN REGULATO - Bulk |
| MAX16930ATLR/V+ | 制造商:Maxim Integrated Products 功能描述:2MHZ, 36V, DUAL BUCK WITH PRE-BOOST AND 40A QUIESCENT CURREN - Rail/Tube |
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