Input Power Supply Interface; Output Power Supply Interface; Figure 3-1 Recommended Power Circuit; Table 3-2 Output Power Supply Interface Signals - Samsung SA-N9001 Hardware Manual

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3.1.2 Input Power Supply Interface

Input power supply interfaces are VPH_PWR.

When the module works normally, power is supplied through the VPH_PWR pins and the voltage ranges from 4.0 V

to 4.4 V (typical value is 4.2 V).

When the module works at GSM mode and transmits signals at the maximum power, the transient peak current

may reach 2.75A due to the differences in actual network environments. In this case, the input power voltage will

drop. If you want good wireless performance, please make sure that the voltage does not drop below 3.8 V in any

case. Otherwise, exceptions such as restart of the module may occur.

A LDO (Low Dropout Regulator) or switch power with current output of more than 3 A is recommended for

external power supply. Furthermore, four 220µF or above energy storage capacitors are connected in parallel at the

power interface of the module. In addition, to reduce the impact of channel impedance on voltage drop, it is

recommended to try to shorten the power supply circuit of the VPH_PWR interface.

The UVLO circuit for the NAD prevents the device from malfunctioning at low-input voltages and from

excessive discharge of the power. As VPH_PWR voltage is under UVLO threshold, the NAD enters into

UVLO state which forces the device to an inactive state until the VPH_PWR is high enough to allow the

device to operate normal function.

The UVLO voltage level are 2.9 V rising and 2.0 V falling (hysteresis 900 mV), respectively. In case the

VPH_PWR voltage rises over 2.9 V, NAD including all regulators starts to operate from lockout state and if

the VPH_PWR voltage falls under 2.0 V, NAD is turned off.

Output power supply interfaces are VLDO2_CP_VDD180 and VLDO10_CP_USIM0.

Pin Name

VLDO2_CP_VDD180

VLDO10_CP_USIM0

VLDO11_CP_USIM1

Through the VLDO2_CP_VDD180, the module can supply 1.8 V power externally with an output current of 10

mA (typical value) for external level conversion. This power is shared with CP GPIO. Be aware to affect CP stable.

Through the VLDO10_CP_USIM0, the module can supply 1.8 V or 2.85 V power for the USIM card.

Typ. (V)

1.8

1.8/2.85

Typ. (mA)

150

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