MAX1965 Maxim Integrated Products, MAX1965 Datasheet - Page 11

• Manufacturer Part Number: MAX1965
• Description: (MAX1964 / MAX1965) Tracking/Sequencing Triple/Quintuple Power-Supply Controllers
• Manufacturer: Maxim Integrated Products

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Figure 1. MAX1964 Standard Application Circuit
The MAX1964/MAX1965 power-supply controllers pro-
vide system power for cable and xDSL modems. The
main step-down DC-DC controller operates in a cur-
rent-mode pulse-width-modulation (PWM) control
scheme to ease compensation requirements and pro-
vide excellent load and line transient response.
C
COMP1
470pF
C
______________________________________________________________________________________
OUT
: 1000µF, 10V SANYO (CZ SERIES)
Detailed Description
R
5MΩ
COMP
Tracking/Sequencing Triple/Quintuple
TO LOGIC
1µF
1µF
C2
C1
C
COMP2
100kΩ
47pF
R
POK
IN
VL
ILIM
POK
COMP
MAX1964
D1
CENTRAL CMPSH-3
GND
OUT
FB2
BST
FB3
DH
DL
B2
B3
LX
FB
Power-Supply Controllers
R
C
0.1µF
R
2200pF
4.64kΩ
1000pF
4.99kΩ
GATE(NH)
BST
GATE(NL)
R
220Ω
R
220Ω
3.0kΩ
10kΩ
C
C
10Ω
10Ω
BE2
BE3
R3
R4
R5
R4
BE2
BE3
The MAX1964 includes two analog gain blocks to regu-
late two additional positive auxiliary output voltages,
and the MAX1965 includes four analog gain blocks to
regulate three additional positive and one negative aux-
iliary output voltages. The positive regulator gain blocks
can be used to generate low voltage rails directly from
the main step-down converter or higher voltages using
coupled windings from the step-down converter. The
Q1
TIP30
Q2
TIP32
N
N
H
L
C4
10µF
C6
10µF
V
1.8V AT 300mA
V
3.3V AT 750mA
INTERNATIONAL
RECTIFIER
IRF7101
OUT2
OUT3
C3
1µF
C5
1µF
33µH
L1
470µF
C
IN
R1
30kΩ
R2
10kΩ
INPUT
9V TO 18V
1000µF
POWER GROUND
ANALOG GROUND
C
OUT
5V AT 1A
V
OUT1
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