SPM1004 datasheet(21/28 Pages) SUMIDA

21 / 28 page

SPM1004

Version 3.3

February 19, 2016

Page 21 of 28

Fig. 25 Sequencing Startup Schematic, VOUT1 = 2.5V,

VOUT2 = 1.8V

Fig. 26 Sequencing Startup Waveform, VOUT1 = 2.5V,

VOUT2 = 1.8V

Transient Response

SPM1004 uses Constant-On-Time (COT) control and achieves excellent transient performance. The following table

summarizes the measured data for each output voltage when the load current undergoes a 3A step between 2A and

5A. The slew rate for the load current change is 1A/µs. The measured transient waveforms are given from Fig. 27 to

Fig. 34.

Table 2. Output Voltage Transient Response

Test Conditions: CIN = 3 x 47µF ceramic capacitor, COUT = 4 × 47µF ceramic capacitor

Module Part Number

VIN

VOUT

3A Load Step (2A to 5A) at 1A/µs

Voltage Deviation (mV)

Recovery Time (µs)

SPM1004-5V0

12V

SPM1004-3V3

12V

3.3V

SPM1004-2V5

12V

2.5V

SPM1004-1V8

12V

1.8V

SPM1004-1V5

12V

1.5V

SPM1004-1V2

12V

1.2V

SPM1004-1V0

12V

1.0V

SPM1004-0V8

12V

0.8V

The following figures show the typical output voltage waveforms when the load current undergoes a step change

between 2A and 5A (3A step), showing that the SPM1004 series achieves excellent dynamic performance.

PWRGD

VOUT

VOUT1 2.5V

PWRGD

VOUT

VOUT2 1.8V

SPM1004-1V8

SPM1004-2V5

VOUT_2

(2 V/div)

VOUT_1

(1 V/div)

VPWRGD_1

(1 V/div)

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