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参数资料
| 型号： | MAX1804EUB+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/11页 |
| 文件大小： | 0K |
| 描述： | IC FEEDBACK INTERGRATOR 10UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 反馈发生器 |
| 电流 - 电源： | 25µA |
| 电源电压： | 2.7 V ~ 5.5 V |
| 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） |
| 供应商设备封装： | 10-µMAX |
| 包装： | 带卷 (TR) |
External Four-Input Feedback Integrator for
Power Supplies
Place the regulator ’ s feedback resistors and R OUT
5V TO
11V
10 μ F
IN
OFF
OUT
10 μ F
FDV 304P
I LOAD
close to the regulator ’ s feedback pin to reduce noise
pickup at the regulator ’ s feedback point, which can
cause unstable switching in the regulator (Figure 5).
MAX603
0 TO
Shutdown Mode
SHDN is a logic input that, when held low, places the
GND
R BOTTOM
100k
SET
R TOP
300k
R TOP
600k
500mA
MAX1804 in its low-power shutdown mode, reducing
the supply current to 10nA (typ). The IN1 – IN4, OUT,
and ADJ are high impedance when the MAX1804 is in
shutdown or when V+ is removed. Connect SHDN to
V+ for normal operation.
Undervoltage Lockout
The MAX1804 has an undervoltage lockout (UVLO) fea-
1.25V
REFERENCE
ADJ
V+
SHDN
SET
IN1
IN2
ture that deactivates the device when the supply volt-
age at V+ goes below 2.4V; IN1 – IN4, OUT, and ADJ go
to high impedance and do not affect the regulator oper-
2200pF
COMP
MAX1804
GND
IN3
IN4
ation. Hysteresis holds the device in lockout until the
supply voltage at V+ rises above 2.6V.
Integrator Gain-Bandwidth Product
and Regulator Stability
Figure 3. MAX1804 Used with Linear Regulator
inputs are disabled, OUT is high impedance. Connect
any unused input to GND.
Setting the Maximum Regulator Output
Voltage Increase
The ratio between the maximum guaranteed OUT cur-
rent of 10μA and the current in the regulator ’ s feedback
resistive divider determines the maximum increase. The
maximum increase in the regulator output voltage
depends on the regulator ’ s upper feedback resistor
(R TOP ) and the sink current into OUT:
? V OUT (MAX) = I OUT (MAX) x R TOP
The maximum adjust current I OUT (MAX) can be further
limited with a resistor (R OUT ) between OUT and the
feedback point of the regulator (see Typical Operating
Circuit ):
I OUT (MAX) = V FB / R OUT
where V FB is the voltage at the regulator ’ s feedback
point.
Therefore:
? V OUT (MAX) = V FB x R TOP / R OUT
and:
R OUT = V FB x R TOP / ? V OUT (MAX)
The MAX1804 gain-bandwidth (GBW) product is set by
the external capacitor on COMP:
GBW = [4 x (IN_ transconductance)] / (2 π ? C COMP )
The bandwidth is typically 40kHz with a 470pF capaci-
tor on COMP.
For system stability, the integrator GBW product is typi-
cally set below the regulator circuit ’ s crossover frequen-
cy, if known. Switching regulators typically have
crossover frequencies well below their switching frequen-
cies. Setting the MAX1804 ’ s GBW product too high can
cause regulator loop instability, typically evidenced by
ringing after transients. Setting the GBW product unnec-
essarily low will slow the MAX1804 ’ s loop response to
transients, although the regulator ’ s loop transient
response will remain unaffected (see Load Transient
Response in Typical Operating Characteristics ).
Often the regulator ’ s crossover frequency varies with
load and is not easily found. If the regulator ’ s crossover
frequency is unknown, the MAX1804 ’ s gain-bandwidth
product can be chosen empirically. Start with a fairly
low capacitor value (470pF is a good starting point)
and increase the value until the circuit is stable with all
loads. Then increase the value further to ensure design
margin. If transient response is unimportant, choose a
large COMP capacitor value (such as 2200pF), thereby
maximizing stability.
8
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