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Dual, Interleaved, Step-Down DC-to-DC Controller with Tracking ADP1823
FEATURES
Fixed-frequency ope...
www.DataSheet4U.com
Dual, Interleaved, Step-Down DC-to-DC Controller with Tracking ADP1823
FEATURES
Fixed-frequency operation: 300 kHz, 600 kHz, or synchronized operation up to 1 MHz Supply input range: 2.9 V to 20 V Interleaved operation results in smaller, low cost input capacitor All-N-channel
MOSFET design for low cost ±0.85% accuracy at 0°C to 70°C Soft start, thermal overload, current-limit protection 10 μA shutdown supply current Internal linear regulator Lossless RDSON current-limit sensing Reverse current protection during soft start for handling precharged outputs Independent Power OK outputs
Voltage tracking for sequencing or DDR termination Available in 5 mm × 5 mm, 32-lead LFCSP
180µF 1µF PV IN TRK1 TRK2 VREG BST1 DH1 EN1 EN2
TYPICAL APPLICATION CIRCUIT
IN = 12V 180µF
BST2 DH2
0.47µF IRLR7807Z 1.2V, 6A
0.47µF IRLR7807Z 1.8V, 8A
ADP1823
2.2µH SW1 2kΩ SW2 CSL2 DL2 PGND2 PGND1 FB1 390pF 2kΩ COMP1 FREQ 4.53kΩ 3900pF GND LDOSD SYNC 3900pF 4.53kΩ FB2 390pF 1kΩ IRFR3709Z 2kΩ 2.2µH
560µF 2kΩ IRFR3709Z
CSL1 DL1
560µF 2kΩ
COMP2
APPLICATIONS
Telecommunications and networking systems Medical imaging systems Base station power Set-top boxes Printers DDR termination
Figure 1. Typical Application Circuit
GENERAL DESCRIPTION
The ADP1823 is a versatile, dual, interleaved, synchronous PWM buck controller that generates two independent output rails from an input of 2.9 V to 20 V. Each controller can be configured to provide output
voltages from 0.6 V to 85% of the inpu...