0.5-5V 4A Dual Output 300-1500KHz Int. LDO Integrated PoL Solution IR3891 (Transient Analysis)

Open online SPICE simulator circuit link: IR3891_analog_12Vin_0.5-5Vo_0.5-5Vo_300-1500KHz_4A_dualOut_intLDO_integrated_POL_TR_V2.TSC


IR3891 Dual Synchronous Buck Regulator
12V Single Supply

{ Please double click here to enter design criteria }

{ Input voltage }
V_in := 12;
{ Target Switching Frequency }
F_sw := 300k;
{ Channel 1 target output voltage }
CH1_V_out := 1.8;
{ Channel 1 maximum output current }
CH1_I_out := 4;
{ Channel 1 number of output capacitors with value C_out }
CH1_C_out_Nr := 4;
{ Channel 1 derated (DC & AC) value for a single output capacitor }
CH1_C_out := 16.7u;
{ Channel 1 target Vout ripple }
CH1_Vout_ripple := 18m;
{ Channel 1 compensation capacitor. Default is 2.2nF }
CH1_C13_Cc := 2.2n;
{ Channel 1 I_ripple vs Iout percentage }
CH1_L_ripple_percentage := 35;
{ Channel 1 load step current }
CH1_I_step := 1.2;
{ Channel 2 target output voltage }
CH2_V_out := 1.2;
{ Channel 2 maximum output current }
CH2_I_out := 4;
{ Channel 2 number of output capacitors with value C_out }
CH2_C_out_Nr := 4;
{ Channel 2 derated (DC & AC) value for a single output capacitor }
CH2_C_out := 17.4u;
{ Channel 2 target Vout ripple }
CH2_Vout_ripple := 12m;
{ Channel 2 compensation capacitor. Default is 2.2nF }
CH2_C23_Cc := 2.2n;
{ Channel 2 I_ripple vs Iout percentage }
CH2_L_ripple_percentage := 35;
{ Channel 2 load step current }
CH2_I_step := 1.2;

The IR3891 SupIRBuck® is an easy-to-use, fully integrated and highly efficient DC/DC
regulator. The onboard PWM controller and MOSFETs make IR3891 a space-efficient
solution, providing accurate power delivery for low output voltage.

IR3891 is a versatile regulator which offers programmability of switching frequency and
a fixed current limit while operating in wide input and output voltage range.

The switching frequency is programmable from 300kHz to 1.5MHz for an optimum
solution. It also features important protection functions, such as Over Voltage Protection
(OVP), Pre-Bias startup, hiccup current limit and thermal shutdown to give required
system level security in the event of fault conditions.

Transient Analysis - accurate
Transient Analysis - fast
Technical Assistance
Product info: IR3891M


Other circuits
Evaluation board: IRDC3891