ADP197ACBZ-R7 Analog Devices Inc, ADP197ACBZ-R7 Datasheet - Page 11

• Manufacturer Part Number: ADP197ACBZ-R7
• Description: IC HIGH-SIDE LOAD SWITCH 6WLSCP
• Manufacturer: Analog Devices Inc
• Series: -r
• Type: High Sider

Specifications of ADP197ACBZ-R7

• Input Type: Non-Inverting
• Number Of Outputs: 1
• On-state Resistance: 12 mOhm
• Current - Output / Channel: 3A
• Current - Peak Output: -
• Voltage - Supply: 1.8 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 6-WFBGA, WLCSP
• Lead Free Status / Rohs Status: Compliant

APPLICATIONS INFORMATION
CAPACITOR SELECTION
Output Capacitor
The ADP197 is designed for operation with small, space-saving
ceramic capacitors but functions with most commonly used capa-
citors when the effective series resistance (ESR) value is carefully
considered. The ESR of the output capacitor affects the response
to load transients. A typical 1 μF capacitor with an ESR of 0.1 Ω
or less is recommended for good transient response. Using a larger
value of output capacitance improves the transient response to
large changes in load current.
Input Bypass Capacitor
Connecting at least 1 μF of capacitance from VIN to GND reduces
the circuit sensitivity to the printed circuit board (PCB) layout,
especially when high source impedance or long input traces are
encountered. When greater than 1 μF of output capacitance is
required, increase the input capacitor to match it.
GROUND CURRENT
The major source for ground current in the ADP197 is the internal
charge pump for the FET drive circuitry. Figure 24 shows the
typical ground current when V
to 5.5 V.
ENABLE FEATURE
The ADP197 uses the EN pin to enable and disable the VOUT
pin under normal operating conditions. As shown in Figure 25,
when a rising voltage (V
threshold, VOUT turns on. When a falling voltage (V
the EN pin crosses the inactive threshold, VOUT turns off.
Figure 24. Ground Current vs. Load Current, Different Input Voltages (V
50
45
40
35
30
25
20
15
10
5
0
1.0
50mA
100mA
200mA
500mA
1000mA
3000mA
1.5
2.0
2.5
EN
) on the EN pin crosses the active
3.0
EN
V
IN
= V
(V)
3.5
IN
, and varies from 1.8 V
4.0
4.5
5.0
EN
) on
5.5
Rev. 0 | Page 11 of 16
IN
)
As shown in Figure 25, the EN pin has hysteresis built into it.
This prevents on/off oscillations that can occur due to noise on
the EN pin as it passes through the threshold points.
The EN pin active/inactive thresholds derive from the V
therefore, these thresholds vary with the changing input voltage.
Figure 26 shows the typical EN active/inactive thresholds when
the input voltage varies from 1.8 V to 5.5 V.
TIMING
Turn-on delay is defined as the interval between the time that
V
~10% of its final value. The ADP197 includes circuitry that has a
typical 1 ms turn-on delay and a controlled rise time to limit the
V
on delay is nearly independent of the input voltage.
IN
EN
inrush current. As shown in Figure 27 and Figure 28, the turn-
exceeds the rising threshold voltage and when V
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
1.2
1.0
0.8
0.6
0.4
0.2
0
0
1.8
0
Figure 26. Typical EN Thresholds vs. Input Voltage (V
V
OUT
EN RISE
EN FALL
2.2
AT 3.6V
0.2
Figure 25. Typical EN Operation
2.6
0.4
3.0
V
ENABLE VOLTAGE (V)
EN
INPUT VOLTAGE (V)
FALLING
3.4
0.6
3.8
4.2
0.8
4.6
V
EN
1.0
5.0
RISING
ADP197
OUT
IN
IN
)
5.4
voltage;
rises to
1.2