参数资料
型号: MAX1992ETG+T
厂商: Maxim Integrated Products
文件页数: 14/36页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 24-TQFN
标准包装: 2,500
系列: Quick-PWM™
PWM 型: 电流模式
输出数: 1
频率 - 最大: 600kHz
占空比: 100%
电源电压: 4.5 V ~ 5.5 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 85°C
封装/外壳: 24-WFQFN 裸露焊盘
包装: 带卷 (TR)
Quick-PWM Step-Down Controllers with Inductor
Saturation Protection and Dynamic Output Voltages
Pin Description (continued)
MAX1992
PIN
MAX1993
NAME
FUNCTION
Shutdown Control Input. Connect to V CC for normal operation. Connect to analog
ground to put the controller into its 1μA shutdown state. When discharge mode is
enabled by OVP/UVP, the output is discharged through a 10 Ω resistor between OUT
23
23
SHDN
and ground, and DL is forced high after V OUT drops below 0.3V. When discharge
mode is disabled by OVP/UVP, OUT remains a high-impedance input and DL is
forced low, so LX also appears as a high-impedance input. A rising edge on SHDN
clears the fault-protection latch.
Overvoltage/Undervoltage Protection and Discharge Mode Control Input. This four-
level logic input selects between various output fault-protection options (Table 6) by
selectively enabling OVP protection and UVP protection. When enabled, the OVP limit
defaults at 116% of the nominal output voltage, and the UVP limit defaults at 70% of
the nominal output voltage. Discharge mode is enabled when UVP protection is also
24
24
OVP/UVP
enabled. Connect OVP/UVP to the following pins for the desired function:
V CC = enable OVP and discharge mode, enable UVP
Open = enable OVP and discharge mode, disable UVP
REF = disable OVP and discharge mode, enable UVP
AGND = disable OVP and discharge mode, and UVP
See the Fault Protection and Shutdown and Output Discharge sections.
Table 1. Component Selection for Standard Applications
COMPONENT
V OUT = 2.5V AT 5A
(FIGURE 1)
V IN = 7V to 24V,
TON = OPEN (300kHz)
V OUT = 1.8V AT 5A
V IN = 7V to 24V,
TON = OPEN (300kHz)
V OUT = 1.0V / 1.5V AT 4A
(FIGURE 9)
V IN = 4.5V to 5.5V,
TON = GND (600kHz)
MAX1992
MAX1993
C IN , input capacitor
C OUT , output capacitor
N H high-side MOSFET
N L low-side MOSFET
D L Schottky rectifier
(optional)
L1 inductor
R SENSE
FB = AGND
Adjustable FB,
REFIN = REF
10μF, 25V
Taiyo Yuden TMK432BJ106KM
220μF, 4V, 15m Ω
Sanyo POSCAP 4TPE220MF
Fairchild Semiconductor
1/2 FDS6982A
Fairchild Semiconductor
1/2 FDS6982A
Nihon EP10QS03L
1A, 30V, 0.45Vf
4.3μH
Sumida CDEP105(L)
15m Ω ±1% 0.5W resistor
IRC LR2010-01-R015F or
Dale WSL-2010-R015F
FB = V CC
FB = OUT,
V REFIN = 1.8V
10μF, 25V
Taiyo Yuden TMK432BJ106KM
220μF, 4V, 15m Ω
Sanyo POSCAP 4TPE220MF
Fairchild Semiconductor
1/2 FDS6982A
Fairchild Semiconductor
1/2 FDS6982A
Nihon EP10QS03L
1A, 30V, 0.45Vf
3.2μH
Sumida CDEP105(L)
15m Ω ±1% 0.5W resistor
IRC LR2010-01-R015F or
Dale WSL-2010-R015F
Not recommended
FB = OUT,
V REFIN = 1.0V / 1.5V
100μF, 10V
Sanyo POSCAP 10TPA100M
220μF, 6V, 12m Ω
Sanyo POSCAP 6TPD220M
Fairchild Semiconductor
1/2 FDS6982S
Fairchild Semiconductor
1/2 FDS6982S
Nihon EP10QS03L
1A, 30V, 0.45Vf
1.4μH
Sumida CDEP105(L)
15m Ω ±1% 0.5W resistor
IRC LR2010-01-R015F or
Dale WSL-2010-R015F
14
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