Datasheet

Data Sheet ADP1851
Rev. 0 | Page 5 of 24
Parameter Symbol Test Conditions/Comments Min Typ Max Unit
SYNC Logic Input Low 1.3 V
SYNC Logic Input High 1.9 V
SYNC Input Pull-Down Resistance R
SYNC
1 MΩ
GATE DRIVERS
DH Rise Time C
DH
= 3 nF, V
BST
− V
SW
= 5 V 16 ns
DH Fall Time C
DH
= 3 nF, V
BST
− V
SW
= 5 V 14 ns
DL Rise Time C
DL
= 3 nF 16 ns
DL Fall Time C
DL
= 3 nF 14 ns
DH to DL Dead Time External 3 nF connected to DH and DL 25 ns
DH or DL Driver R
ON
, Sourcing
Current
1
R
ON_SOURCE
Sourcing 2 A with a 100 ns pulse 2 Ω
Sourcing 1 A with a 100 ns pulse, V
IN
= 3 V 2.3 Ω
DH or DL Driver R
ON
, Tempco TC
RON
V
IN
= 3 V or 12 V 0.3 %/°C
DH or DL Driver R
ON
, Sinking
Current
1
R
ON_SINK
Sinking 2 A with a 100 ns pulse 1.5 Ω
Sinking 1 A with a 100 ns pulse, V
IN
= 3 V 2 Ω
DH Maximum Duty Cycle
1
f
OSC
= 300 kHz 90 %
f
OSC
= 1500 kHz 50 %
Minimum DH On Time
f
OSC
= 200 kHz to 1500 kHz
85
ns
Minimum DH Off Time f
OSC
= 200 kHz to 1500 kHz 345 ns
Minimum DL On Time f
OSC
= 200 kHz to 1500 kHz 295 ns
COMP VOLTAGE RANGE
COMP Pulse Skip Threshold V
COMP,THRES
In pulse skip mode (PSM) 0.9 V
COMP Clamp High Voltage V
COMP,HIGH
2.2 V
THERMAL SHUTDOWN
Thermal Shutdown Threshold T
TMSD
155 °C
Thermal Shutdown Hysteresis 20 °C
OVERVOLTAGE AND POWER-GOOD
THRESHOLDS
FB Overvoltage Threshold V
OV
V
FB
rising 0.630 0.65 0.670 V
FB Overvoltage Hysteresis 18 mV
FB Undervoltage Threshold V
UV
V
FB
falling 0.525 0.55 0.575 V
FB Undervoltage Hysteresis 15 mV
SOFT START/TRACK
SS/TRK Output Current I
SS
During startup 4.6 6.5 8.4 µA
SS/TRK Pull-Down Resistor
During a fault condition
3
kΩ
SS/TRK Input Voltage Range
1
0 5 V
FB to SS/TRK Offset V
SS/TRK
= 0.1 V to 0.6 V; offset = V
FB
− V
SS/TRK
−10 +10 mV
PGOOD
PGOOD Pull-Up Resistor R
PGOOD
Internal pull-up resistor to VCCO 12.5 kΩ
PGOOD Delay 12 µs
Overvoltage or Undervoltage
Minimum Duration
Minimum duration required to trigger the
PGOOD signal
10 µs
ILIM Threshold Voltage
1
Relative to PGND −5 0 +5 mV
ILIM Output Current ILIM = PGND 45 50 55 µA
Current Sense Blanking Period After DL goes high; current limit is not sensed
during this period
100 ns
INTEGRATED RECTIFIER
(BOOST DIODE) RESISTANCE
At 20 mA forward current 16 Ω
ZERO CURRENT CROSS OFFSET
(SW TO PGND)
1
In pulse skip mode only; f
OSC
= 300 kHz
0
2
4
mV
1
Guaranteed by design.
2
Connect VIN to VCCO when V
IN
< 5.5 V.