ADP5600ACPZ-R7 datasheet(18/25 Pages) AD

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ADP5600

Data Sheet

Rev. 0 | Page 18 of 25

CURRENT-LIMIT AND OUTPUT SHORT-CIRCUIT

PROTECTION (SCP)

The ADP5600 includes a current-limit protection circuitry to

limit the input and output current. The current-limit circuitry

clamps the current flow to 200 mA on both the charging phase

and output phase. Because C1 and C2 are out of phase, there is a

continuous 200 mA flowing at VIN and CPOUT, as shown in

Figure 50 and Figure 51.

Figure 50. Current Limit, C1 Charging Phase and C2 Output Phase

Figure 51. Current Limit, C2 Charging Phase and C1 Output Phase

Figure 52 shows the response of ADP5600 when a hard short

from CPOUT to ground occurs.

Figure 52. CPOUT Entry to Short Circuit

If the hard short occurs from LDO_OUT to GND, the

ADP5600 LDO current limit is hit first, so that only −160 mA is

conducted into the short.

Figure 53. LDO_OUT Entry to Short Circuit

POWER GOOD

Power good (PGOOD) is an active high, open-drain output and

requires a resistor to pull it up to a voltage. When PGOOD is

high, it indicates that the voltage on the FB pin, and therefore

the LDO output voltage, is near the desired value. A low on the

PGOOD pin indicates that the voltage on the FB pin is not

within the desired value. There is an eight-switching cycle

waiting period after FB goes below PGTH and PGOOD asserts

low. If VFB goes above PGTH within the eight switching cycles,

the event is ignored by the PGOOD circuitry.

UNDERVOLTAGE LOCKOUT (UVLO)

Undervoltage lockout circuitry is integrated in the ADP5600 to

prevent the occurrence of power-on glitches. If the VIN voltage

drops below UVLOFALLING, then the ADP5600 partially shuts

down with the oscillator, charge pump, and LDO regulator

turned off. When the VIN voltage rises again above UVLORISING,

the soft start period is initiated and the ADP5600 is fully

enabled.

Figure 54. UVLO Threshold

CCPOUT

CC2

CPOUT

VIN

–INMOSLIMIT

CIN

CC1

IPMOSLIMIT

CCPOUT

CPOUT

VIN

CIN

CC2

CC1

–INMOSLIMIT

IPMOSLIMIT

CH1 200mA BW CH2 5.00V BW

CH3 1.00V BW CH4 10.0V BW

M100µs

A CH2

–3.40V

191µs

PGOOD

C1+

VLDO_OUT

VCPOUT

IIN

CH1 100mA BW CH2 5.00V BW

CH3 1.00V BW CH4 10.0V BW

M400µs

A CH3

–480V

78.8µs

PGOOD

C1+

VLDO_OUT

VCPOUT

IIN

0.1

–0.6

–0.5

–0.2

–0.4

–0.3

–0.1

INPUT VOLTAGE (V)

UVLO_RISING

UVLO_FALLING

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