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| 型号： | MAX8663ETL+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 29/34页 |
| 文件大小： | 0K |
| 描述： | IC PMIC LI+ SNGL CELL 40TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 手持/移动设备 |
| 电流 - 电源： | 900µA |
| 电源电压： | 4.1 V ~ 8 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-WFQFN 裸露焊盘 |
| 供应商设备封装： | 40-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
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Power-Management ICs for
Single-Cell, Li+ Battery-Operated Devices
transient performance is the larger (1μF) high-voltage
(30V) output capacitor.
The RC compensation network from CC3 to GND
affects the WLED driver’s sink current ramp time. As
shown in the OUT3 Enable and Disable Response
graph in the Typical Operating Characteristics section,
the OUT3 voltage ramps up in 1.25ms, but the WLED
sink current of 30mA settles in 12ms. This 12ms is
associated with the compensation of 1k ? in series with
0.22μF. Smaller RC time constants reduce the WLED
sink current ramp time.
OUT3 Diode Selection
The MAX8662 boost converter ’s high-switching fre-
quency demands a high-speed rectification diode (D1)
for optimum efficiency. A Schottky diode is recom-
mended due to its fast recovery time and low forward-
voltage drop. Ensure the diode’s peak current rating
exceeds the peak inductor current. In addition, the
diode ’s reverse breakdown voltage must exceed
V OUT3 . See Table 4 for component examples.
Linear Regulators
(OUT4, OUT5, OUT6, and OUT7)
The MAX8662/MAX8663 contain four low-dropout, low-
quiescent current, low-operating voltage linear regula-
tors. The maximum output currents for OUT4, OUT5,
OUT6, and OUT7 are 500mA, 150mA, 300mA, and
150mA, respectively. Each regulator has its own enable
input. When enabled, a linear regulator soft-starts by
ramping the outputs at 34V/ms. This limits inrush cur-
rent when the regulators are enabled.
The LDO output voltages, OUT4, OUT5, OUT6, and
OUT7 are pin programmable by SL1 and SL2 (Table 3).
SL1 and SL2 are intended to be hardwired and cannot
be driven by active logic. Changes to SL1 and SL2
after power-up are ignored.
VL Linear Regulator
VL is the output of a 3.3V linear regulator that powers
the on-chip input limiter and charger control circuitry.
VL is powered from DC and can provide up to 10mA
when a DC source is present. Bypass VL to GND with a
0.1μF capacitor.
Regulator Enable Inputs (EN_)
The OUT1 –OUT7 regulators have individual enable
inputs. Drive EN_ high to initiate soft-start and enable
OUT_. Drive EN_ low to disable OUT_. When disabled,
each regulator (OUT1 –OUT7) switches in an active
pulldown resistor to discharge the output.
Soft-Start/Inrush Current
The MAX8662/MAX8663 implement soft-start on many
levels to control inrush current and avoid collapsing
source supply voltages. The input-voltage limit and bat-
tery charger have a 1.5ms soft-start time. All regulators
also implement soft-start. White LED driver soft-start is
accomplished by ramping the OVP current from 0 to
20μA in 1.25ms. During soft-start, the PWM controller
forces 0% switching duty cycle to avoid an input cur-
rent surge at turn-on.
Undervoltage and Overvoltage Lockout
DC UVLO
When the DC voltage is below the DC undervoltage
threshold (V UVLO_DC , typically 3.5V falling), the
MAX8662/MAX8663 enter DC undervoltage lockout (DC
UVLO). DC UVLO forces the power management cir-
cuits to a known dormant state until the DC voltage is
high enough to allow the device to make accurate deci-
sions. In DC UVLO, Q1 is open (Figure 2), the charger is
disabled, POK is high-Z, and CHG is high-Z. The sys-
tem load switch, Q2 (Figure 2) is closed in DC UVLO,
allowing the battery to power the SYS node. All regula-
tors are allowed to operate from the battery in DC UVLO.
Table 3. SL1 and SL2, Output Voltage Selection
CONNECT SL_ TO:
LINEAR REGULATOR OUTPUT VOLTAGES
SL1
Open circuit
Ground
SYS
Open circuit
Ground
SYS
Open circuit
Ground
SYS
SL2
Open circuit
Open circuit
Open circuit
Ground
Ground
Ground
SYS
SYS
SYS
OUT4 (V)
3.3
3.3
2.85
3.3
2.5
2.5
1.2
3.3
1.8
OUT5 (V)
3.3
2.85
2.85
2.85
3.3
3.3
1.8
2.85
2.5
OUT6 (V)
3.3
1.85
1.85
2.85
1.5
1.5
1.1
1.5
3.3
OUT7 (V)
3.3
1.85
1.85
1.85
1.5
1.3
1.3
1.5
2.85
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8663EVKIT+ | 制造商:Maxim Integrated Products 功能描述:MAX8663 EVAL KIT - Boxed Product (Development Kits) |
| MAX8664AEEP+ | 功能描述:DC/DC 开关控制器 Dual-Output Step Step-Down Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX8664AEEP+T | 功能描述:DC/DC 开关控制器 Dual-Output Step Step-Down Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX8664BEEP+ | 功能描述:DC/DC 开关控制器 Dual-Output Step Step-Down Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX8664BEEP+T | 功能描述:DC/DC 开关控制器 Dual-Output Step Step-Down Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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