LM3370 Datasheet, PDF (18/33 Pages) National Semiconductor (TI) – Dual Synchronous Step-Down DC-DC Converter with Dynamic Voltage Scaling Function

LM3370
SNVS406M – NOVEMBER 2005 – REVISED AUGUST 2011
REGISTER 00
MSB
LSB
76543210
Bit 6 & 7 are not used
REGISTER 01
MSB
LSB
76543210
Bit 6 and 7 are not used
EN1 for Buck 1 (default = 1)
Bit0 = 1 to enable
EN2 for Buck 2 (default = 1)
Bit1 = 1 to enable
Spread Spectrum (SS) Enable
Bit2 = 1 to enable
SS_fmod (SS Frequency Modulator)
ss_fmod = 1 1 kHz (default)
ss_fmod = 0 2 kHz
Pstep Enable for Buck1
Pstep = 0 (default) not enable
Pstep = 1 50 mV/step at 32 Ps/step
Pstep Enable for Buck2
Pstep = 0 (default) not enable
Pstep = 1 100 mV/step at 32 Ps/step
Vout for Buck 1
00101 = 1V (Min.)
11111 = 2V (Max.)
Forced PWM Mode (FPWM1)
Auto = 0 (default)
FPWM1 = 1 (PWM mode only)
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