ADP1823 Datasheet, PDF (30/32 Pages) Analog Devices – Dual, Interleaved, Step-Down DC-to-DC Controller with Tracking

ADP1823
The ADP1823 can also be configured to drive an output load of
less than 1 A. Figure 34 shows a typical application circuit that
drives a 1.5 A and a 3 A loads in an all multilayer ceramic
capacitor (MLCC) solutions. Notice that the two MOSFETs
used in this example are dual-channel MOSFETs in a
PowerPAK® SO-8 package, which reduces cost and saves layout
space. An alternative to using the dual-channel SO-8 package is
using two single MOSFETs in SOT-23 or TSOP-6 packages,
which are low cost and small in size. For input voltages less than
3.7 V, it is recommended to use MOSFETs that are fully turned
on at VGS less than 3 V. Because there is a forward voltage (VF)
drop across the Schottky diode D1 or D2, for input voltages less
than 3.3 V, the effective voltage to the internal gate drivers may
not be enough to drive a large load at the output. A Schottky
diode with VF less than 0.5 V at IF of 100 mA is recommended
for input voltages less than 3.3 V.
IN = 3V TO 4V
1µF
10µF
×2
1µF
D2
0.22µF
1.0V, 3A
M3
L2
2.2µH
C_OUT3
100µF
C_OUT2
47µF
1µF
8.2nF
84.5Ω
M4
1.33kΩ
4.12kΩ
120nF
2kΩ
6.65kΩ
1.5nF
PV IN _EN1
TRK1
EN2
TRK2
VREG
BST1
BST2
DH1
DH2
ADP1823
SW1
SW2
CSL1
CSL2
DL1
DL2
PGND1 PGND2
FB1
FB2
COMP1 COMP2
GND
FREQ
LDOSD
SYNC
D1
1µF
10µF
×2
0.22µF
PGND
M1
L1
2.5µH
1.8V, 1.5A
1.4kΩ
8.2nF
1µF
10µF
C_OUT1
100µF
M2
2kΩ
84.5Ω
120nF
1kΩ
6.65kΩ
1.5nF
IN
f_OSC = 600kHz
AGND
M1 TO M4: DUAL-CHANNEL SO-8 IRF7331
L1: SUMIDA, CDRH5D28-2R5NC
L2: TOKO, FDV0602-2R2M
C_OUT2: MURATA, GRM31CR60J476M
C_OUT1, C_OUT3: MURATA, GRM31CR60J107M
D1, D2: CENTRAL SEMI, CMDSH2-4L
Figure 34. Application Circuit with all Multilayer Ceramic Capacitors (MLCC)
Rev. A | Page 30 of 32