TDA3681ATH Datasheet, PDF (14/22 Pages) NXP Semiconductors – Multiple voltage regulator with switch and ignition buffer

Philips Semiconductors
Multiple voltage regulator with
switch and ignition buffer
Product specification
TDA3681A
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
Temperature protection
T_j(sd)
junction temperature for
shutdown
T_j(hold)
junction temperature for
hold trigger
150 160
170
°C
150 160
170
°C
Notes
1. Minimum operating voltage, only if V_P1 has exceeded 6.5 V.
2. The total quiescent current is measured in the standby mode. Therefore, the enable inputs of regulators 1, 3, 4 and
the power switch are grounded and R_L(REG2) = ∞ (see Fig.8).
3. The voltage of the regulator drops as a result of a V_P1 drop for regulators 1 and 2. Regulators 3 and 4 drop as a result
of V_P2 drop.
4. The rise and fall times are measured with a 10 kΩ pull-up resistor and a 50 pF load capacitor.
5. The delay time depends on the value of the reset delay capacitor: t_d(RES) = _I--Cc---_h- × V_C(th) = C × (750 × 10³)[s]
6. The delay time depends on the value of the reset delay capacitor: t_d(SW) = _I--Cc---_h- × V_C(th) = C × (375 × 10³)[s]
7. The drop-out voltage of regulators 1 and 2 is measured between pins V_P1 and REGn. The drop-out voltage of
regulators 3 and 4 is measured between pins V_P2 and REGn.
8. At current limit, I_m(REGn) is held constant (see Fig.6).
9. The foldback current protection limits the dissipated power at short-circuit (see Fig.6).
10. The drop-out voltage is measured between pins BU and REG2.
11. The drop-out voltage of the power switch is measured between pins V_P1 and SW.
12. The maximum output current of the power switch is limited to 1.8 A when the supply voltage exceeds 18 V.
13. At short-circuit, I_sc(SW) of the power switch is held constant to a lower value than the continuous current after a delay
of at least 10 ms (see Fig.7).
2003 Aug 29
14