Datasheet LTC4126 (Analog Devices) - 20
| 制造商 | Analog Devices |
| 描述 | 7.5mA Wireless Li-Ion Charger with 1.2V Step-Down DC/DC Converter |
| 页数 / 页 | 22 / 20 — APPLICATIONS INFORMATION. TYPICAL APPLICATIONS. Full-Featured Application … |
| 文件格式/大小 | PDF / 2.3 Mb |
| 文件语言 | 英语 |
APPLICATIONS INFORMATION. TYPICAL APPLICATIONS. Full-Featured Application Circuit
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LTC4126
APPLICATIONS INFORMATION
to the PC board ground for a good electrical connection. charger to pause charging. For optimum thermal perfor- Although the LTC4126 is a low power IC, the shunt circuitry mance, there should be a group of vias directly under the in the AC power control block can cause a fair amount exposed pad on the backside leading directly down to an of on-chip power dissipation if the available AC power is internal ground plane. To minimize parasitic inductance, excessive. If the heat is not dissipated properly on the PC the ground plane should be as close as possible to the board, the temperature of the die and subsequently, the top plane of the PC board (Layer 2). temperature of the battery may rise above the hot tem- perature threshold set by the NTC thermistor causing the
TYPICAL APPLICATIONS Full-Featured Application Circuit
V 17.8k IN 4.75V TO 5.25V RBIAS NTC 100k 47µF 22mΩ 0.01µF VCC BAT D1 LTC4126 NTC RESISTOR AIR GAP Li-Ion + THERMALLY 47µF 100k (2mm TO 4mm) R 4.2V NTC CHRG COUPLED IN2 IN1 IN ACIN WITH BATTERY 100k STAT C IS+ RX 68nF OUT 1.2V IS– SW1 2.2µF DTH C V+ 20.5k LTC4125 TX LTX LRX FTH 100nF 6.5µH 8µH STAT1 PTH1 EN µP SW2 STAT2 GPIO PTH2 VSEL 1.05k ACPR GND IMON EN GND PBEN 1.5M PTHM FB CTS PUSHBUTTON 4126 TA02 CTD NTC CTX: TDK C3216COG2A104J160AC GND LTX: WURTH 760-308-101-104 RNTC: VISHAY NTCS0402E3104*HT M1: VISHAY Si2312CDS-T1-GE3 D1: ROHM SEMICONDUCTOR SML-311UTT86
Minimum Component Count Application Circuit
AIR GAP ACIN EN CRX BAT 68nF + Li-Ion L TRANSMITTER L RX LTC4126 TX 4.2V 8µH NTC V + IN – VSEL OUT 1.2V GND 2.2µF 4126 TA04 CRX: AVX0603YC683JAT2A LRX: SUNLORD MQQRC060630S8R0 Rev. 0 20 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
APPLICATIONS INFORMATION
to the PC board ground for a good electrical connection. charger to pause charging. For optimum thermal perfor- Although the LTC4126 is a low power IC, the shunt circuitry mance, there should be a group of vias directly under the in the AC power control block can cause a fair amount exposed pad on the backside leading directly down to an of on-chip power dissipation if the available AC power is internal ground plane. To minimize parasitic inductance, excessive. If the heat is not dissipated properly on the PC the ground plane should be as close as possible to the board, the temperature of the die and subsequently, the top plane of the PC board (Layer 2). temperature of the battery may rise above the hot tem- perature threshold set by the NTC thermistor causing the
TYPICAL APPLICATIONS Full-Featured Application Circuit
V 17.8k IN 4.75V TO 5.25V RBIAS NTC 100k 47µF 22mΩ 0.01µF VCC BAT D1 LTC4126 NTC RESISTOR AIR GAP Li-Ion + THERMALLY 47µF 100k (2mm TO 4mm) R 4.2V NTC CHRG COUPLED IN2 IN1 IN ACIN WITH BATTERY 100k STAT C IS+ RX 68nF OUT 1.2V IS– SW1 2.2µF DTH C V+ 20.5k LTC4125 TX LTX LRX FTH 100nF 6.5µH 8µH STAT1 PTH1 EN µP SW2 STAT2 GPIO PTH2 VSEL 1.05k ACPR GND IMON EN GND PBEN 1.5M PTHM FB CTS PUSHBUTTON 4126 TA02 CTD NTC CTX: TDK C3216COG2A104J160AC GND LTX: WURTH 760-308-101-104 RNTC: VISHAY NTCS0402E3104*HT M1: VISHAY Si2312CDS-T1-GE3 D1: ROHM SEMICONDUCTOR SML-311UTT86
Minimum Component Count Application Circuit
AIR GAP ACIN EN CRX BAT 68nF + Li-Ion L TRANSMITTER L RX LTC4126 TX 4.2V 8µH NTC V + IN – VSEL OUT 1.2V GND 2.2µF 4126 TA04 CRX: AVX0603YC683JAT2A LRX: SUNLORD MQQRC060630S8R0 Rev. 0 20 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts