PDF《PM8908》

7 V VIN To PGND, GND -0.3 to

4 V BOOT To PGND, GND -0.3 to

11 V To PGND, GND, t <

10 ns -0.3 to 12.2(2) 2. Regardless of application configuration, it is mandatory not to exceed the AMR voltage value on the BOOT and PHASE pins. V To PHASE -0.3 to

7 V PHASE To PGND, GND -2 to

4 V To PGND, GND, t <

10 ns -2.2 to 7.5(2) V PGOOD To PGND, GND -0.3 to

7 V EN To PGND, GND -0.3 to

7 V VOUT To PGND, GND -1.0 to 3.6 V REFIN, COMP, REF, MODE To GND -0.3 to 3.6 V Electrical specifications PM8908 10/28 DocID027688 Rev

4 4.2 Electrical characteristics VCC = 5.0 V ± 5%, TA = 70°C (unless otherwise specified). Table 5. Electrical characteristics Symbol Parameter Test conditions Min. Typ. Max. Unit Supply current and undervoltage lockout IIN VIN shutdown current Shutdown, EN =

0 V 0.3

5 ?A ICC VCC supply current EN = H, VBOOT = 4.5 V, VCC = 4.5 V, VIN = 3.5 V, VM = GND

2 3.6 mA ICCSD VCC shutdown current Shutdown, EN =

0 V

4 10 ?A IBSS Boot input current VBOOT =

9 V, VPHASE = 3.5 V, VCC = 5.5 V

150 ?A VCC VCC supply voltage 4.5 5.0 5.5 V VCC UVLO VCC turn-on VCC rising 4.2 4.37 4.5 V Hysteresis

440 mV REF UVLO VREF turn-on REF rising 1.8 V Hysteresis

100 mV Oscillator, off-time and on-time fSW Oscillator accuracy RM =

100 k?

1 MHz RM =

47 k? 0.6 tOFF-min Minimum off-time VIN = 1.5 V, VOUT = 0.9 V, VREFIN =

1 V, fSW =

1 MHz / 0.6 MHz

170 ns Reference and GM amplifier ?VOUT Output voltage accuracy VREFIN =

1 V, no droop -1 +1 % VREF Voltage reference IREF =

0 1.95 2.0 2.05 V GM Transconductance(1) 1.00 mS ICSK COMP pin maximum sinking current VCOMP =

2 V, VREFIN - VOUT = -80 mV

80 ?A ICSR COMP pin maximum sourcing current VCOMP =

2 V, VREFIN - VOUT =

80 mV -80 ?A VCM Common mode input voltage range(1)

0 2 V VDM Differential mode input voltage range(1)

0 80 mV VOSet Input offset

0 mV F-3dB -3 dB frequency(1) 4.5 6.0 7.5 MHz ACS Current sense gain Gain from the current of the LS to PWM comp when PWM = OFF 47.3 59.3 mV/A DocID027688 Rev

4 11/28 PM8908 Electrical specifications

28 Soft-end RDS Phase discharge resistance

51 ? Overcurrent protection IOCL Positive overcurrent threshold LS sourcing, RM =

47 k?

4 7.6

11 A IOCLN Negative overcurrent threshold LS sourcing, RM =

47 k? -11 - 7.6 -

4 A Bootstrap switch RBSS Boot switch on-resistance IBOOT =

10 mA, TA =

25 °C 12.........