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参数资料
| 型号： | MAX8677CETG+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/21页 |
| 文件大小： | 0K |
| 描述： | IC USB/AC ADP CHARGER 24-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion）、锂聚合物（Li-Pol） |
| 电源电压： | 4.1 V ~ 6.6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 供应商设备封装： | 24-TQFN-EP（4x4） |
| 包装： | 带卷 (TR) |
1.5A Dual-Input USB/AC Adapter Charger
and Smart Power Selector
Table 1. External Components List for Figures 2 and 3
COMPONENT
(FIGURES 2, 3)
C IN
CL
C SYS
C BAT
CT
R PU (x 4)
THM
RT
R PSET
R ISET
FUNCTION
Input filter capacitor
VL filter capacitor
SYS output bypass capacitors
Battery bypass capacitor
Charger timing capacitor
Logic output pullup resistors
Negative TC thermistor
THM pullup resistor
Input current-limit programming resistor
Fast-charge current programming resistor
PART
4.7μF ceramic capacitor
0.1μF ceramic capacitor
10μF ceramic capacitor
4.7μF ceramic capacitor
0.068μF low TC ceramic capacitor
560k Ω
Phillips NTC thermistor, P/N 2322-640-63103, 10k Ω ±5% at +25°C
10k Ω ±1%
1.5k Ω ±1% for 2A limit
3k Ω ±1% for 1A charging
The MAX8677C features OVP. Part of this protection is
a 4.35V voltage limiter at SYS. If the DC or USB input
exceeds 4.35V, SYS still limits at 4.35V.
The MAX8677C has numerous other charging and
power-management features, which are detailed in the
following sections.
Smart Power Selector
The MAX8677C Smart Power Selector seamlessly dis-
tributes power between the external inputs, the battery,
and the system load (Figure 4). The basic functions
performed are:
System Load Switch
An internal 40m Ω MOSFET connects SYS to BAT (Q3,
Figure 4) when no voltage source is available at DC or
USB. When an external source is detected at DC or
USB, this switch is opened and SYS is powered from
the valid input source through the input limiter.
The SYS-BAT switch also holds up SYS when the sys-
tem load exceeds the input current limit. If that should
happen, the SYS-BAT switch turns on so that the bat-
tery supplies additional SYS load current. If the system
load continuously exceeds the input current limit, the
battery does not charge, even though external power is
?
With both an external power supply (USB or
adapter) and battery connected:
When the system load requirements are less
than the input current limit, the battery is
charged with residual power from the input.
When the system load requirements exceed the
connected. This is not expected to occur in most
cases, since high loads usually occur only in short
peaks. During these peaks, battery energy is used, but
at all other times the battery charges.
input current limit, the battery supplies supple-
mental current to the load.
AC
ADAPTER
DC
MAX8677C
SYS
?
When the battery is connected and there is no
external power input, the system is powered from
the battery.
Q1
CHARGE
CURRENT
LOAD
CURRENT
SYSTEM
LOAD
? When an external power input is connected and
there is no battery, the system is powered from the
external power input.
A thermal-limiting circuit reduces the battery charge
rate and external power-source current to prevent the
USB
USB
Q2
Q3
CHARGE AND
SYS LOAD
SWITCH
BAT
GND
BATTER
MAX8677C from overheating.
Figure 4. Smart Power Selector Block Diagram
______________________________________________________________________________________
13
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