MMPF0100 datasheet(71/136 Pages) FREESCALE

71 / 136 page

100

0.1

100

1000

)

Load Current (mA)

PFM ‐ Vout = 1.5V

APS ‐ Vout = 1.5V

PWM ‐ Vout = 1.5V

Analog Integrated Circuit Device Data

Freescale Semiconductor

PF0100

Functional Block Requirements and Behaviors

Power Generation

Figure 19. SW3AB Single Phase Efficiency Waveforms

7.4.4.6

SW4

SW4 is a 1.0 A rated single phase buck regulator capable of operating in two modes. In its default mode, it operates as a normal

buck regulator with a programmable output between 0.400 and 3.300 V. It is capable of operating in the three available switching

modes: PFM, APS, and PWM, described on Table 29 and configured by the SW4MODE[3:0] bits, as shown in Table 30.

If the system requires DDR memory termination, SW4 can be used in its VTT mode. In the VTT mode, its reference voltage will

track the output voltage of SW3A, scaled by 0.5. Furthermore, when in VTT mode, only the PWM switching mode is allowed. The

VTT mode can be configured by use of VTT bit in the OTP_SW4_CONFIG register.

Figure 20 shows the block diagram and the external component connections for the SW4 regulator.

SWITCH MODE SUPPLY SW3A/B (CONTINUED)

SW3A N-MOSFET Leakage Current

VIN = VINSW3A = 4.5 V

ISW3ANQ

––

2.5

µA

SW3B P-MOSFET RDSON

at VIN = VINSW3B = 3.3 V

RONSW3BP

–

215

245

SW3B N-MOSFET RDSON

at VIN = VINSW3B = 3.3 V

RONSW3BN

–

258

326

SW3B P-MOSFET Leakage Current

VIN = VINSW3B = 4.5 V

ISW3BPQ

––

7.5

µA

SW3B N-MOSFET Leakage Current

VIN = VINSW3B = 4.5 V

ISW3BPQ

––

2.5

µA

Discharge Resistance

RSW3xDIS

–

600

–

Notes

41.

When output is set to > 2.6 V the output will follow the input down when VIN gets near 2.8 V.

42.

The higher output voltages available depend on the voltage drop in the conduction path as given by the following equation:

(VINSW3x - VSW3x) = ISW3x* (DCR of Inductor +RONSW3xP + PCB trace resistance).

Table 77. SW3A/B Electrical Characteristics

All parameters are specified at TA = -40 to 85 °C, VIN = VINSW3x = 3.6 V, VSW3x = 1.5 V, ISW3x = 100 mA,

SW3x_PWRSTG[2:0] = [111], typical external component values, fSW3x = 2.0 MHz, single/dual phase and independent mode

unless, otherwise noted. Typical values are characterized at VIN = VINSW3x = 3.6 V, VSW3x = 1.5 V, ISW3x = 100 mA,

SW3x_PWRSTG[2:0] = [111], and 25 °C, unless otherwise noted.

arameter

Symbol

Min

Typ

Max

Unit

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