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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1761 Datasheet

Small / Dual / High-Efficiency Buck Controller for Notebooks

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19-1835; Rev 0; 10/00
EVAALVUAAILTAIOBNLEKIT
Small, Dual, High-Efficiency
Buck Controller for Notebooks
General Description
The MAX1761 dual pulse-width-modulation (PWM),
step-down controller provides high efficiency, excellent
transient response, and high DC output accuracy in an
extremely compact circuit topology. These features are
essential for stepping down high-voltage batteries to
generate low-voltage CPU core, I/O, and chipset RAM
supplies in PC board area critical applications, such as
notebook computers and smart phones.
Maxim’s proprietary Quick-PWM™ quick-response,
constant-on-time PWM control scheme handles wide
input/output voltage ratios with ease and provides
“instant-on” response to load transients while maintain-
ing a relatively constant switching frequency.
The MAX1761 achieves high efficiency at reduced cost
by eliminating the current-sense resistor found in tradi-
tional current-mode PWMs. Efficiency is further
enhanced by its ability to drive large synchronous-recti-
fier MOSFETs. The MAX1761 employs a complemen-
tary MOSFET output stage, which reduces component
count by eliminating external bootstrap capacitors and
diodes.
Single-stage buck conversion allows this device to
directly step down high-voltage batteries for the highest
possible efficiency. Alternatively, two-stage conversion
(stepping down the +5V system supply instead of the
battery) at a higher switching frequency allows the mini-
mum possible physical size.
The MAX1761 is intended for CPU core, chipset,
DRAM, or other low-voltage supplies. The MAX1761 is
available in a 16-pin QSOP package. For applications
requiring greater output power, refer to the MAX1715
data sheet. For a single-output version, refer to the
MAX1762/MAX1791 data sheet.
________________________Applications
Notebooks and PDAs
Digital Cameras
Handy-Terminals
Smart Phones
1.8V/2.5V Logic and I/O Supplies
Quick-PWM and Dual Mode are trademarks of
Maxim Integrated Products.
Features
o Free-Running On-Demand PWM
o Selectable Light-Load Pulse-Skipping Operation
o ±1% Total DC Error in Forced-PWM Mode
o 5V to 20V Input Range
o Flexible Output Voltages
OUT1: Dual Mode™ Fixed 2.5V or 1V to 5.5V
Adjustable
OUT2: Dual Mode Fixed 1.8V or 1V to 5.5V
Adjustable
o Output Undervoltage Protection
o Complementary Synchronous Buck
o No Current-Sense Resistor
o 4.65V at 25mA Linear Regulator Output
o 4µA V+ Shutdown Supply Current
o 5µA VL Shutdown Supply Current
o 950µA Quiescent Supply Current
o Tiny 16-Pin QSOP Package
PART
MAX1761EEE
Ordering Information
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
16 QSOP
Pin Configuration
TOP VIEW
FB1 1
OUT1 2
REF 3
ON2 4
V+ 5
ON1 6
OUT2 7
FB2 8
MAX1761
QSOP
16 DH1
15 CS1
14 DL1
13 VL
12 GND
11 DL2
10 CS2
9 DH2
________________________________________________________________ Maxim Integrated Products 1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1761 Datasheet

Small / Dual / High-Efficiency Buck Controller for Notebooks

No Preview Available !

Small, Dual, High-Efficiency
Buck Controller for Notebooks
ABSOLUTE MAXIMUM RATINGS
V+ to GND ..............................................................-0.3V to +22V
VL to GND ................................................................-0.3V to +6V
VL to V+ .............................................................................+0.3V
OUT_, ON2 to GND ..................................................-0.3V to +6V
ON1, DH_ to GND ........................................-0.3V to (V+ + 0.3V)
FB_, REF, DL_ to GND.................................-0.3V to (VL + 0.3V)
CS_ to GND .....................................................-2V to (V+ + 0.3V)
REF Short Circuit to GND ...........................................Continuous
Continuous Power Dissipation
16-Pin QSOP (derate 8.3mW/°C above +70°C) ......….667mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature.........................................-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
(Circuit of Figure 1, V+ = 15V, CVL = 4.7µF, CREF = 0.1µF, VL not externally driven unless otherwise noted, TA = 0°C to +85°C, unless
otherwise noted.) (Note 1)
PARAMETER
PWM CONTROLLERS
Input Voltage Range
DC Output Voltage Accuracy
(Note 3)
Output Voltage Adjust Range
OUT_ Input Resistance
FB_ Input Bias Current
CS_ Input Bias Current
Soft-Start Ramp Time
On-Time (Note 4)
Minimum Off-Time (Note 4)
BIAS AND REFERENCE
Quiescent Supply Current
SYMBOL
CONDITIONS
V+
VOUT_
(Note 2)
V+ = 4.5V to 20V,
VL = 4.75V to 5.25V,
ON2 = VL
FB_ = OUT_
FB1 = GND
FB2 = GND
tON
tOFF
VFB_ = 1V, VL = 5V
VCS_ = 0, VL = 5V
Zero to full ILIM
V+ = 10V, VOUT1 = 2.5V,
VOUT2 = 1.8V
OUT1
OUT2
IL
FB1 = FB2 = GND, VL = 5V, VOUT1 and
VOUT2 forced above regulation point
FB1 = FB2 = GND, VOUT1 VL undriven
I+ and VOUT2 forced
above regulation point
VL = 5V
MIN TYP MAX UNITS
4.5
0.99
2.475
1.782
1
80
-0.1
-1
661
648
1
2.5
1.8
160
1700
735
720
400
20
1.01
2.525
1.818
5.5
300
0.1
1
809
792
500
V
V
V
k
µA
µA
µs
ns
ns
0.60
0.95
0.38
1.20
1.70
0.65
mA
mA
Shutdown Supply Current
VL Output Voltage
Reference Voltage
Reference Load Regulation
REF Sink Current
REF Fault Lockout Voltage
IL
I+
VL
VREF
IREF
VL = 5V, ON1 = ON2 = GND
VL = 0, 5V
ILOAD = 0 to 25mA, V+ = 5V to 20V
V+ = 5V to 20V, no load
IREF = 0 to 50µA
REF in regulation
Falling edge
Rising edge
4.5
1.98
5
4
4.65
2
10
1.6
1.94
10
10
4.75
2.02
8
µA
µA
V
V
mV
µA
V
2 _______________________________________________________________________________________


Part Number MAX1761
Description Small / Dual / High-Efficiency Buck Controller for Notebooks
Maker Maxim
Total Page 23 Pages
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