HM100 データシートの表示（PDF） - Unspecified

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HM100

QC2.0 Interface Module

Unspecified 

HM100

QC2.0 Interface Module

Applications Information

HM100 is a low-cost USB high-voltage dedicated Shunt Regulator

charging port interface IC for the Quick Charge The internal shunt regulator clamps the BYPASS

2.0 specification. It incorporates all necessary pin at 6 V when current is provided through an

functions to add Quick Charge 2.0 c apability to external resistor (RBP in Figure 1). This

standard Adaptors, Car-chargers, and Portable facilitates powering of HM100 externally over the

Battery Packs.

wide power supply output voltage range of 5 V

HM100 also supports other solutions with to 20 V. Recommended values are RBP = 4.7 kΩ

traditional feedback schemes like opto-coupler and CBP = 220 nF.

and secondary reference regulator SE431 as

depicted in Figure 1.

BYPASS Pin Undervoltage

The BYPASS pin undervoltage circuitry resets

the HM100 when the BYPASS pin voltage drops

below 3.9 V . Once the BYPASS pin voltage

drops below 3.9 V it must rise back to 4 V to

enable correct operation.

Reference Input

Resister RREF at the REFERENCE pin is

connected to an internal band gap reference and

provides an accurate reference current for

internal timing circuits. The recommended value

Figure 1. HM100 with Traditional Output Regulation (CV Only).

is RREF = 127 kΩ.

Quick Charge 2.0 Interface

HM100 supports the full output voltage range of At power-up HM100 turns on s witch N5 (see

Quick Charge 2.0 Class A (5 V, 9 V, or 12 V) or Figure 3) in 20 ms or less after the BYPASS pin

Class B (5 V, 9 V , 12 V , or 20 V ). It voltage has reached 4 V. Switch N4 and output

automatically detects either Quick Charge 2.0 switches N1 to N3 remain off. This sets the

capable powered devices (PD) or legacy PDs default 5 V output voltage level. With D+ and D-

compliant with the USB Battery Charging short-circuited the normal handshake between

Specification revision 1.2 a nd only enables the AC-DC adapter (DCP) and powered devices

output voltage adjustment accordingly.

(PD) as described in the USB Battery Charging

Specification 1.2 c an commence. After switch

N5 has been turned on HM100 starts monitoring

the voltage level at D+. If it continuously stays

At USB cable disconnect the voltage level at D+

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