参数资料
型号: MAX8764ETP+
厂商: Maxim Integrated Products
文件页数: 11/23页
文件大小: 0K
描述: IC CNTRL STP DWN HS 20-TQFN
标准包装: 60
应用: 控制器,笔记本电脑电源系统
输入电压: 2 V ~ 28 V
输出数: 1
输出电压: 1.8V,2.5V,1 V ~ 5.5 V
工作温度: 0°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 20-WQFN 裸露焊盘
供应商设备封装: 20-TQFN-EP(5x5)
包装: 管件
High-Speed, Step-Down Controller with
Accurate Current Limit for Notebook Computers
IN
2V TO 28V
V+
TON
ON-TIME
COMPUTE
FROM
OUT
Q
TOFF
1-SHOT
TRIG
MAX8764
BST
5V
TON
S
Q
DH
SKIP
SHDN
TRIG
1-SHOT
Q
ERROR
AMP
R
LX
V DD
+5V
OUTPUT
OVP
1.14V
REF
S
DL
Q
R
0.1V
V CC - 1V
LATCH
POR
OVP/UVP
LATCH
R
9R
ILIM
20ms
0.1V
TIMER
CURRENT
V CC - 1V
0.7V
LIMIT
Σ
1.0V
V CC - 1V
CS
ZERO CROSSING
GND
UVP
REF
-10%
REF
+10%
x2
CHIP
SUPPLY
OUT
V CC
5V
PGOOD
FEEDBACK
MUX
(SEE FIGURE 6)
2V
REF
REF
FB
Figure 2. MAX8764 Functional Diagram
battery supply, the enable signal ( SHDN ) must be
delayed until the battery voltage is present to ensure
startup. The 5V bias supply provides V CC and gate-drive
power, so the maximum current drawn is:
I BIAS = I CC + f (Q G1 + Q G2 ) = 5mA to 30mA (typ)
where I CC is 550μA (typ), f is the switching frequency,
and Q G1 and Q G2 are the MOSFET data sheet total
gate-charge specification limits at V GS = 5V.
Free-Running, Constant-On-Time PWM
Controller with Input Feed-Forward
The Quick-PWM control architecture is a pseudo-fixed-fre-
quency, constant-on-time, on-demand PWM with voltage
feed-forward (Figure 2). This architecture relies on the out-
put filter capacitor’s ESR to act as a current-sense resistor,
so the output ripple voltage provides the PWM ramp sig-
nal. The control algorithm is simple: the high-side switch
on-time is determined solely by a one-shot whose pulse
______________________________________________________________________________________
11
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MAX8764ETP+ 功能描述:电流型 PWM 控制器 High-Speed Step Down Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14
MAX8764ETP+T 功能描述:电流型 PWM 控制器 High-Speed Step Down Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14
MAX8764ETP-T 功能描述:电流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14
MAX8765AETI+ 功能描述:电池管理 Multichemistry Battery Charger RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel
MAX8765AETI+T 功能描述:电池管理 Multichemistry Battery Charger RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel