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参数资料
| 型号： | MAX1856EUB+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/18页 |
| 文件大小： | 0K |
| 描述： | IC PWR SPLY PWM SLIC 10-UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 控制器，卫星接收机顶盒，xDSL 和线缆调制解调器 |
| 输入电压： | 3 V ~ 28 V |
| 输出数： | 1 |
| 输出电压： | -24V，-72V |
| 工作温度： | 0°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-uMAX |
| 包装： | 带卷 (TR) |
Wide Input Range, Synchronizable,
PWM SLIC Power Supply
*INPUT
4.5V TO 24V
R5
10 ?
C IN
(2x) 10 μ F
25V
T1
D2
OUT2
-72V
C4
1 μ F
C LDO
1 μ F
9
10
1
2
V CC
SYNC/SHDN
MAX1856
LDO
FREQ
EXT
CS
8
6
R6
100 ?
C5
1nF
1
M1
R CS
33m ?
2
2
2
D1
R2
681k ?
R4
470 ?
C3
100pF
R1
174k ?
C2
100 μ F
Sanyo
100MV100AX
OUT1
-24V
C1
330 μ F
Sanyo
35MV330AX
R OSC
200k ?
FB
5
3 GND
R3
5.11k ?
C FB
1nF
7
PGND
REF
4
C REF
2.2 μ F
D1, D2: Central Semiconductor CMR1U-02
M1: International Rectifier IRLL2705
T1: Coiltronics CTX01-14853
*INPUT RANGE LIMITED BY OUTPUT POWER REQUIREMENTS.
SEE MAXIMUM OUTPUT POWER AND TYPICAL OPERATING CHARACTERISTICS .
Figure 1. Standard Application Circuit
Low-Dropout Regulator (LDO)
All MAX1856 functions, including EXT, are internally
powered from the on-chip, low-dropout 5V regulator.
The regulator input is at V CC , while its output is at LDO.
The V CC -to-LDO dropout voltage is typically 200mV
(300mV max at 12mA), so that when V CC is <5.2V,
V LDO is typically V CC - 200mV. When the LDO is in
dropout, the MAX1856 still operates with V CC as low as
3V (as long as the LDO exceeds 2.7V), but with
reduced amplitude FET drive at EXT. The maximum
V CC input voltage is 28V.
LDO can supply up to 12mA to power the IC, supply
gate charge through EXT to the external FET, and sup-
ply small external loads. When driving particularly large
FETs at high switching rates, little or no LDO current
may be available for external loads. For example, when
switched at 500kHz, a large FET with 20nC gate charge
requires 20nC ? 500kHz, or 10mA.
Soft-Start
The MAX1856 features a “ digital ” soft-start that is pre-
set and requires no external capacitor. Upon startup,
the peak inductor current increments from 1/5th of the
value set by R CS , to the full current-limit value in five
steps over 1024 cycles of f OSC or f SYNC . Additionally,
the oscillator runs at 1/3 the normal operating frequen-
cy (f OSC /3) until the output voltage reaches 20% of its
nominal value (V FB ≤ 1.0V). See the Typical Operating
Characteristics for a scope picture of the soft-start
operation. Soft-start is implemented: 1) when power is
first applied to the IC, 2) when exiting shutdown with
power already applied, and 3) when exiting undervolt-
age lockout. The MAX1856 ’ s soft-start sequence does
not start until V LDO reaches 2.5V.
Design Procedure
The MAX1856 can operate within a wide input voltage
range from 3V to 28V. This allows it to be used with wall
adapters. In applications driven by low-power, low-cost
and low input and output ripple current requirements,
the MAX1856 flyback topology can be used to gener-
ate various levels of output voltages and multiple out-
puts.
Communications over the Internet interface with a stan-
dard telephone connection, which includes the
Subscriber Line Interface Circuit (SLIC). The SLIC
requires a negative power supply for the audio and
ringer functions. The circuits discussed here are
designed for these applications. The following design
discussions are related to the standard application cir-
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| MAX1856EVKIT | 功能描述:电源管理IC开发工具 Evaluation Kit for the MAX1856 RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX1857EUA47 | 功能描述:低压差稳压器 - LDO 500mA Ripple-Rejecting RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MAX1857EUA47+ | 功能描述:低压差稳压器 - LDO 500mA Ripple-Rejecting RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MAX1857EUA47+T | 功能描述:低压差稳压器 - LDO 500mA Ripple-Rejecting RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MAX1857EUA47-T | 功能描述:低压差稳压器 - LDO 500mA Ripple-Rejecting RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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