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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1875 Datasheet

Dual 180 Out-of-Phase PWM Step- Down Controllers with POR

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19-2431; Rev 0; 7/02
EVAALVUAAILTAIOBNLEKIT
Dual 180° Out-of-Phase PWM Step-
Down Controllers with POR
General Description
The MAX1875/MAX1876 dual, synchronized, step-down
controller generates two outputs from input supplies
ranging from 4.75V to 23V. Each output is adjustable from
sub-1V to 18V and supports loads of 10A or higher. Input
voltage ripple and total RMS input ripple current are
reduced by synchronized 180° out-of-phase operation.
The switching frequency is adjustable from 100kHz to
600kHz with an external resistor. Alternatively, the con-
troller can be synchronized to an external clock gener-
ated to another MAX1875/MAX1876 or a system clock.
One MAX1875/MAX1876 can be set to generate an in-
phase, or 90° out-of-phase, clock signal for synchro-
nization with additional controllers. This allows two
controllers to operate either as an interleaved two- or
four-phase system with each output shifted by 90°.
These devices also feature soft-start and soft-stop.
The MAX1875/MAX1876 eliminate the need for current-
sense resistors by utilizing the low-side MOSFET’s on-
resistance as a current-sense element. This protects
the DC-DC components from damage during output-
overload conditions or when output short-circuit faults
without requiring a current-sense resistor. Adjustable
foldback current limit reduces power dissipation during
short-circuit conditions. The MAX1876 includes a
power-on reset output to signal the system when both
outputs reach regulation.
The MAX1875/MAX1876 are available in a 24-pin QSOP
package. An evaluation kit is available to speed designs.
Applications
Network Power Supplies
Telecom Power Supplies
DSP, ASIC, and FPGA Power Supplies
Set-Top Boxes
Broadband Routers
Servers
Typical Operating Circuit appears at end of data sheet.
Features
o Two Independent Output Voltages
o 180° Out-of-Phase Operation
o 90° Out-of-Phase Operation
(Using Two MAX1875/MAX1876s)
o Foldback Current Limit
o 4.75V to 23V Input Supply Range
o 0 to 18V Output-Voltage Range (Up to 10A)
o >90% Efficiency
o Fixed-Frequency Pulse-Width Modulation (PWM)
Operation
o Adjustable 100kHz to 600kHz Switching
Frequency
o External SYNC Input
o Clock Output for Master/Slave Synchronization
o Soft-Start and Soft-Stop
o RST Output with 140ms Minimum Delay (MAX1876)
o Lossless Current Limit (No Sense Resistor)
Ordering Information
PART
MAX1875EEG
MAX1876EEG
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
24 QSOP
24 QSOP
Pin Configuration
TOP VIEW
COMP2 1
FB2 2
ILIM2 3
OSC 4
V+ 5
REF 6
GND 7
CKO 8
SYNC 9
ILIM1 10
FB1 11
COMP1 12
MAX1875/
MAX1876
QSOP
24 EN
23 DH2
22 LX2
21 BST2
20 DL2
19 VL
18 PGND
17 DL1
16 BST1
15 LX1
14 DH1
13 RST
(MAX1876 ONLY)
________________________________________________________________ Maxim Integrated Products 1
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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1875 Datasheet

Dual 180 Out-of-Phase PWM Step- Down Controllers with POR

No Preview Available !

Dual 180° Out-of-Phase PWM Step-
Down Controllers with POR
ABSOLUTE MAXIMUM RATINGS
V+ to GND ..............................................................-0.3V to +25V
PGND to GND .......................................................-0.3V to +0.3V
VL to GND ..................-0.3V to the lower of +6V and (V+ + 0.3V)
BST1, BST2 to GND ...............................................-0.3V to +30V
LX1 to BST1..............................................................-6V to +0.3V
LX2 to BST2..............................................................-6V to +0.3V
DH1 to LX1 ..............................................-0.3V to (VBST1 + 0.3V)
DH2 to LX2 ..............................................-0.3V to (VBST2 + 0.3V)
DL1, DL2 to PGND........................................-0.3V to (VL + 0.3V)
CKO, REF, OSC, ILIM1, ILIM2,
COMP1, COMP2 to GND ..........................-0.3V to (VL + 0.3V)
FB1, FB2, RST, SYNC, EN to GND...........................-0.3V to +6V
VL to GND Short Circuit .............................................Continuous
REF to GND Short Circuit ...........................................Continuous
Continuous Power Dissipation (TA = +70°C)
24-Pin QSOP (derate 9.4mW/°C above +70°C)...........762mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V+ = 12V, EN = ILIM_ = VL, SYNC = GND, IVL = 0mA, PGND = GND, CREF = 0.22µF, CVL = 4.7µF (ceramic), ROSC = 60k,
compensation components for COMP_ are from Figure 1, TA = -40°C to +85°C (Note 1), unless otherwise noted.)
PARAMETER
GENERAL
V+ Operating Range
V+ Operating Supply Current
V+ Standby Supply Current
Thermal Shutdown
Current-Limit Threshold
VL REGULATOR
Output Voltage
VL Undervoltage Lockout
Trip Level
REFERENCE
Output Voltage
Reference Load Regulation
SOFT-START
Digital Ramp Period
Soft-Start Steps
FREQUENCY
Low End of Range
High End of Range
DH_ Minimum Off-Time
CONDITIONS
(Note 2)
VL = V+ (Note 2)
VL unloaded, no MOSFETs connected
EN = LX_ = FB_ = 0V
ROSC = 60k
Rising temperature, typical hysteresis = 10°C
ILIM_ = VL
PGND - LX_
RILIM_ = 100k
RILIM_ = 600k
5.5V < V+ < 23V, 1mA < ILOAD < 50mA
MIN TYP MAX UNITS
4.75 23
4.75 5.5
3.5 6
0.3 0.6
160
75 100 125
32 50 62
225 300 375
4.75 5 5.25
4.4 4.55 4.7
V
mA
mA
°C
mV
mV
mV
V
V
IREF = 0µA
0µA < IREF < 50µA
1.98 2.00 2.02
0 4 10
V
mV
Internal 6-bit DAC for one converter to ramp from 0V to
full scale (Note 3)
1024
64
DC-DC
Clocks
Steps
ROSC = 60k
ROSC = 10k
ROSC = 10k
0°C to +85°C
-40°C to +85°C
84 100 115
kHz
80 100 120
540 600 660 kHz
250 303
ns
2 _______________________________________________________________________________________


Part Number MAX1875
Description Dual 180 Out-of-Phase PWM Step- Down Controllers with POR
Maker Maxim
Total Page 21 Pages
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