Datasheet > FAN5910UCX

FAN5910UCX

更新时间： 2023-09-03 20:40:22

品牌	Logo	应用领域
安森美 - ONSEMI		GSM
页数	文件大小	规格书
16页	533K
描述
Multi-Mode Buck Converter with LDO Assist for GSM / EDGE, 3G/3.5G and 4G PAs

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数据手册

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FAN5910UCX 数据手册

FAN5910

DC−DC – LDO−Assist

The LDO−assist function maintains output regulation

when V approaches V , enables fast transition times

under heavy loads, and minimizes PCB space by enabling a

smaller inductor to be employed by using the LDO to

provide a portion of the necessary load current.

The LDO−assist function limits the maximum current that

the DC−DC may supply by shunting current away from the

DC−DC under heavy loads and high duty cycles. In addition,

the LDO−assist enables a seamless transition into 100%

duty cycle, ensuring both low output ripple and constant

output regulation. Since the LDO−assist function limits the

maximum current supplied by the DC−DC, PCB area is

minimized by enabling a lower current capable, and thus

smaller form factor, inductor to be used.

V_OUT+ 2.5 V_CON

(eq. 1)

The FAN5910 provides regulated V

only if V

CON

OUT

falls within the typical range from 0.16 V to 1.44 V. This

allows V to be adjusted between 0.4 V and 3.6 V. If

OUT

is less than 0.16 V, V

is clamped to 0.40 V. In

CON

OUT

Auto PFM/PWM Mode, the FAN5910 automatically

switches between PFM and PWM. In Forced PWM Mode

(MODE = 0), the FAN5910 automatically switches into

PWM Mode.

5.0

4.5

4.0

3.5

3.0

2.5

2.0

DC−DC – Sleep Mode

The Sleep Mode minimizing current while enabling rapid

return to regulation. Sleep Mode is entered when V

CON

Sleep Mode

held below 70 mV for at least 40 ms. In this mode, current

consumption is reduced to under 50 mA. Sleep Mode is

1.5

DCDC Mode

1.0

exited after ~12 ms when V

is set above 125 mV.

CON

DCDC+LDO-Assist

0.5

0.0

Application Information

0.2 0.4 0.6 0.8

1.2 1.4 1.6 1.8

Figure 26 illustrates the FAN5910 in a GSM / EDGE /

WCDMA transmitter configuration, driving multiple GSM

/ EDGE and 3G/3.5G and 4G PAs. Figure 27 presents a

timing diagram designed to meet GSM specifications.

V_CON[V]

Figure 25. Output Voltage vs. Control Voltage

The FAN5910 is designed to support fast voltage

transients when configured for GSM/EDGE applications

(MODE=0). Figure 28 shows a timing diagram for

WCDMA applications.

DC Output Voltage

The output voltage is determined by V

external DAC or voltage reference:

provided by an

CON

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