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| 型号： | MAX8934GETI+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 17/29页 |
| 文件大小： | 0K |
| 描述： | IC LI BATT CHARGER DUAL 28TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 75 |
| 系列： | * |
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MAX8934G
Dual-Input Linear Charger, Smart Power Selector
with Advanced Battery Temperature Monitoring
Table 1. External Components List for Figures 2 and 3
COMPONENT
(Figures 2 and 3)
C DC
C USB
C VL
C SYS
C BATT
C CT
C LDO
R PU (x5)
THM
R THMSW
R PSET
R ISET
FUNCTION
DC filter capacitor
USB filter capacitor
V L filter capacitor
SYS output bypass capacitors
Battery bypass capacitor
Charger timing capacitor
LDO output capacitor
Logic-output pullup resistors
Negative TC thermistor
THM pullup resistor
DC input current-limit programming resistor
Fast-charge current programming resistor
PART NUMBER
10 F F ± 10%, 16V X5R ceramic capacitor (0805)
Taiyo Yuden EMK212BJ106KG
4.7 F F ± 10%, 10V X5R ceramic capacitor (0805)
Taiyo Yuden LMK212BJ475KD
0.1 F F ± 10%, 10V X5R ceramic capacitor (0402)
Taiyo Yuden LMK105BJ104KV
10 F F ± 10%, 6.3V X5R ceramic capacitor (0805)
Taiyo Yuden JMK212BJ106KD
4.7 F F ± 10%, 6.3V X5R ceramic capacitor (0805)
Taiyo Yuden JMK212BJ475KD
0.068 F F ± 10%, 16V X5R ceramic capacitor (0402)
Taiyo Yuden EMK105BJ683KV
1 F F ± 1 0%, 6.3V X5R ceramic capacitor (0402)
Taiyo Yuden JMK105BJ105KV
1M I ± 5% resistor
Vishay NTC Thermistor P/N NTHS0603N01N1003FF
100k I
1.5k I ± 1% for 2A limit
3k I ± 1% for 1A charging
Detailed Description
The MAX8934G is a dual-input linear charger with Smart
Power Selector that safely charges a single Li+/Li-Poly cell
in accordance with JEITA specifications. The MAX8934G
integrates power MOSFETs and control circuitry to manage
power flow in portable devices. See Figure 1. The charger
has two power inputs, DC and USB. These can be sepa-
rately connected to an AC adapter output and a USB port,
or the DC input could be a single power input that connects
to either an adapter or USB. Logic inputs, PEN1 and PEN2,
select the correct current limits for two-input or single-input
operation. Figure 2 is the typical application circuit using
separate DC and USB connectors. Figure 3 is the typical
application circuit using a 5-pin USB connector or another
DC/USB common connector.
In addition to charging the battery, the MAX8934G also
supplies power to the system through the SYS output. The
charging current is also provided from SYS so that the set
input current limit controls the total SYS current, where total
SYS current is the sum of the system load current and the
battery-charging current. SYS is powered from either the
DC input pin or the USB input pin. If both the DC and USB
sources are connected, DC takes precedence.
Maxim Integrated
In some instances, there may not be enough adapter
current or USB current to supply peak system loads. The
MAX8934G Smart Power Selector circuitry offers flexible
power distribution from an AC adapter or USB source to
the battery and system load. The battery is charged with
any available power not used by the system load. If a
system load peak exceeds the input current limit, supple-
mental current is taken from the battery. Thermal limiting
prevents overheating by reducing power drawn from the
input source.
The MAX8934G features an overvoltage limiter at SYS. If
the DC or USB input voltage exceeds the SYS regulation
voltage, V SYS does not follow V DC or V USB , but remains
at its regulation voltage. The MAX8934G has numerous
other charging and power-management features that are
detailed in the following sections.
A 3.3V ultra-low quiescent current, always-on LDO pro-
vides up to 30mA for indicator LEDs and for backup
power to the system. This LDO powers the thermistor
monitor circuitry and provides bias to the external pullup
resistor for the thermistor.
17
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8934GETI+ | 功能描述:电池管理 Dual Linear Charger Smart Power Selector 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 |
| MAX8934GETI+CAK | 功能描述:电池管理 Dual Input Linear Chargers Smart Power Selector 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 |
| MAX8934GETI+T | 功能描述:电池管理 Dual Linear Charger Smart Power Selector 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 |
| MAX8936EVKIT+ | 制造商:Maxim Integrated Products 功能描述:NULL TRIM FOR PQ69Z - Boxed Product (Development Kits) |
| MAX8936EWE+T | 制造商:Maxim Integrated Products 功能描述:NULL TRIM FOR PQ69Z - Tape and Reel |
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