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MAX1964 Datasheet(PDF) 1 Page - Maxim Integrated Products

Part # MAX1964
Description  Tracking/Sequencing Triple/Quintuple Power-Supply Controllers
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX1964 Datasheet(HTML) 1 Page - Maxim Integrated Products

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General Description
The MAX1964/MAX1965 power-supply controllers are
designed to address cost-sensitive applications
demanding voltage sequencing/tracking, such as
cable modem consumer premise equipment (CPE),
xDSL CPE, and set-top boxes. Operating off a low-cost,
unregulated DC supply (such as a wall adapter output),
the MAX1964 generates three positive outputs and the
MAX1965 generates four positive outputs and one neg-
ative output to provide an inexpensive system power
supply.
The MAX1964 includes a current-mode synchronous
step-down controller and two positive regulator gain
blocks. The MAX1965 has one additional positive gain
block and one negative regulator gain block. The main
synchronous step-down controller generates a high-
current output that is preset to 3.3V or adjustable from
1.236V to 0.75 VIN with an external resistive-divider.
The 200kHz operating frequency allows the use of low-
cost aluminum-electrolytic capacitors and low-cost
power magnetics. Additionally, the MAX1964/MAX1965
step-down controllers sense the voltage across the low-
side MOSFET’s on-resistance to efficiently provide the
current-limit signal, eliminating the need for costly cur-
rent-sense resistors.
The MAX1964/MAX1965 generate additional supply
rails at low cost. The positive regulator gain blocks use
an external PNP pass transistor to generate low voltage
rails directly from the main step-down converter (such
as 2.5V or 1.8V from the main 3.3V output) or higher
voltages using coupled windings from the step-down
converter (such as 5V, 12V, or 15V). The MAX1965’s
negative gain block uses an external NPN pass transis-
tor in conjunction with a coupled winding to generate
-5V, -12V, or -15V.
All output voltages are externally adjustable, providing
maximum flexibility. During startup, the MAX1964 fea-
tures voltage sequencing and the MAX1965 features
voltage tracking. Both controllers provide a power-
good output that monitors all of the output voltages.
Applications
xDSL, Cable, and ISDN Modems
Set-Top Boxes
Wireless Local Loop
Features
o 4.5V to 28V Input Voltage Range
o Master DC-DC Step-Down Converter:
Preset 3.3V or Adjustable (1.236V to 0.75 x VIN)
Output Voltage
Fixed Frequency (200kHz) PWM Controller
No Current-Sense Resistor
Adjustable Current Limit
95% Efficient
Soft-Start
o Two (MAX1964)/Four (MAX1965) Analog Gain
Blocks:
Positive Analog Blocks Drive Low-Cost PNP
Pass Transistors to Build Positive Linear
Regulators
Negative Analog Block (MAX1965) Drives a
Low-Cost NPN Pass Transistor to Build a
Negative Linear Regulator
o Power-Good Indicator
o Voltage Sequencing (MAX1964) or Tracking
(MAX1965)
Tracking/Sequencing Triple/Quintuple
Power-Supply Controllers
________________________________________________________________ Maxim Integrated Products
1
TOP VIEW
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
POK
IN
VL
BST
DH
LX
DL
GND
ILIM
MAX1964
16-Pin QSOP
COMP
OUT
FB2
FB
B2
B3
FB3
IN
VL
BST
DH
LX
DL
GND
ILIM
POK
COMP
OUT
FB2
FB
B2
B3
FB3
20
19
18
17
16
15
14
13
1
2
3
4
5
6
7
8
12
11
9
10
FB5
B5
FB4
B4
MAX1965
20-Pin QSOP
Pin Configurations
19-2084; Rev 0; 7/01
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Typical Operating Circuit appears at end of data sheet.
Ordering Information
PART
TEMP.
RANGE
PIN-
PACKAGE
fOSC
(kHz)
MAX1964TEEE
-40
°C to +85°C
16 QSOP
200
MAX1965TEEP
-40
°C to +85°C
20 QSOP
200


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