AS3517H-ECTP datasheet(45/94 Pages) AMSCO

45 / 94 page

AS3517 V17

Data Sheet, Confidential

www.austriamicrosystems.com

VBUS Charge Pump (USB OTG Supply)

With the pin USBH_CSN and USBH_CSP connected to ground the USB-OTG mode is selected. In this mode the charge pump supplies

5V and 8mA. The charge pump uses the QLDO2 voltage as input and doubles its voltage with the help of the flying capacitor between

CP_CP and CN_GEXT to its output VBUS. If the pulse skip bit is set in the related register, the charge pump switches to pulse skip mode

for improved efficiency. Enabled pulse skip mode, however, compromises with a higher output voltage ripple.

Figure 28 VBUS CP Block Diagram

Parameter

Table 34 VBUS Generation Parameter

Symbol

Parameter

Min

Typ

Max

Unit

Note

CP Mode

ICPOUT

Output Current

@ 4.7V output voltage

IVDD

Quiescent Current

600

µA

VCPOUT

Output Voltage

4.7

5.0

5.3

CFLY=100nF,ICPOUT=0..8mA

FIN

Switching frequency

375

kHz

CFLY

External flying capacitor

100

ceramic, low ESR

capacitor between CP_CP

and CN_GEXT

CSTORE

External storage capacitor

2.2

ceramic, low ESR

capacitor between VBUS

and VSS

DCDC Mode

IVDD

Quiescent Current

140

µA

Pulse Skipping mode

VRsense_max

Current Limit at Rsense

100

e.g.: 1A for 0.1 Ohm sense

resistor

ILOAD

Load Current

500

@ 5V output voltage

fIN

Fixed Switching Frequency

750

KHz

tMIN_ON

Minimum On-Time

130

MDC

Maximum Duty Cycle

COUT

Output Capacitor

4.7

µF

Ceramic, +/-20%

Inductor

µH

Use inductors with small

CPARASITIC (<100pF) for

high efficiency

NSW

NMOS switch

ON-resistance of external

switching transistor max.

PSW

PMOS switch

ON-resistance of external

PMOS transistor as low as

possible, because of

efficiency

Rsense

Current Limit Sense Resistor

100

mΩ

e.g.: 1A for 0.1 Ohm sense

resistor

BVDD=3.3V, TA=25°C, unless otherwise specified

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