AS1310-BTDT-331 查看數據表（PDF） - austriamicrosystems AG

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AS1310-BTDT-331

Ultra Low Quiescent Current, Hysteretic DC-DC Step-Up Converter

austriamicrosystems AG 

AS1310

Datasheet - Application Information

9.1.2 Thermal Shutdown

To prevent the AS1310 from short-term misuse and overload conditions the chip includes a thermal overload protection. To block the normal

operation mode all switches will be turned off. The device is in thermal shutdown when the junction temperature exceeds 150°C. To resume the

normal operation the temperature has to drop below 140°C.

A good thermal path has to be provided to dissipate the heat generated within the package. Otherwise it’s not possible to operate the AS1310 at

its usable maximal power. To dissipate as much heat as possible from the package into a copper plane with as much area as possible, it’s

recommended to use multiple vias in the printed circuit board. It’s also recommended to solder the Exposed Pad (pin 9) to the GND plane.

Note: Continuing operation in thermal overload conditions may damage the device and is considered bad practice.

lid 9.2 Always On Operation

In battery powered applications with long standby times as blood glucose meters, remote controls, soap dispensers, etc., a careful battery

management is required. Normally a complex power management control makes sure that the DCDC is only switched on, when it is really

a needed. With AS1310 this complex control can be saved completely, since the AS1310 is perfectly suited to support always-on operations of the

application. The efficiency at standby currents of e.g. 2µAs is around 45% (see Figure 17).

v Figure 17. Efficiency vs. Output Current for Always ON Operation

ill 100

L1: XPL2010-682M

90

t 80

70

G s 60

A t 50

40

s n 30

e 20

m t 10

0

a n 0.001

Vin = 1.1V

Vin = 1.5V

0.01

0.1

1

10

100

Output Current (mA)

l co 9.3 Component Selection

Only four components are required to complete the design of the step-up converter. The low peak currents of the AS1310 allow the use of low

a value, low profile inductors and tiny external ceramic capacitors.

ic 9.4 Inductor Selection

For best efficiency, choose an inductor with high frequency core material, such as ferrite, to reduce core losses. The inductor should have low

DCR (DC resistance) to reduce the I²R losses, and must be able to handle the peak inductor current without saturating. A 6.8µH inductor with a

n >500mA current rating and <500mΩ DCR is recommended.

h Table 4. Recommended Inductors

c Part Number

XPL2010-682M

eEPL2014-682M

TLPS3015-682M

L

6.8µH

6.8µH

6.8µH

DCR

421mΩ

287mΩ

300mΩ

Current Rating

0.62A

0.59A

0.86A

Dimensions (L/W/T)

2.0x1.9x1.0 mm

2.0x2.0x1.4 mm

3.0x3.0x1.5 mm

Manufacturer

Coilcraft

LPS3314-682M

6.8µH

240mΩ

0.9A

3.3x3.3x1.3 mm

www.coilcraft.com

LPS4018-682M

6.8µH

150mΩ

1.3A

3.9x3.9x1.7 mm

XPL7030-682M

6.8µH

59mΩ

9.4A

7.0x7.0x3.0 mm

www.austriamicrosystems.com/DC-DC_Step-Up/AS1310

Revision 1.8

14 - 19

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