MAX1999EEI ,High-Efficiency / Quad Output / Main Power- Supply Controllers for Notebook ComputersFeatures♦ No Current-Sense Resistor Needed (MAX1999)The MAX1777/MAX1977/MAX1999 dual step-down,swit ..
MAX1999EEI+ ,High-Efficiency, Quad Output, Main Power-Supply Controllers for Notebook ComputersMAX1777/MAX1977/MAX199919-2187; Rev 1; 9/04High-Efficiency, Quad Output, Main Pow er-Supply Control ..
MAX1999EEI+T ,High-Efficiency, Quad Output, Main Power-Supply Controllers for Notebook ComputersELECTRICAL CHARACTERISTICS(Circuit of Figure 1 and Figure 2, no load on LDO5, LDO3, OUT3, OUT5, and ..
MAX199ACAI ,Multi-Range (【4V, 【2V, +4V, +2V), +5V Supply, 12-Bit DAS with 8+4 Bus InterfaceELECTRICAL CHARACTERISTICS (continued)(V = 5V ±5%; unipolar/bipolar range; external reference mode, ..
MAX199ACAI+ ,8-Channel, Multi-Range, 5V, 12-Bit DAS with 8+4 Bus Interface and Fault ProtectionGeneral Description ________
MAX199ACWI ,Multi-Range (【4V, 【2V, +4V, +2V), +5V Supply, 12-Bit DAS with 8+4 Bus InterfaceApplications REFADJRD 4 25Industrial-Control SystemsHBEN 5 24 INTMAX199RoboticsSHDN 6 23 CH7Data-Ac ..
MAX5035AASA+ ,1A, 76V, High-Efficiency MAXPower Step-Down DC-DC ConverterEVALUATION KIT AVAILABLEMAX50351A, 76V, High-Efficiency MAXPower Step-Down DC-DC Converter
MAX5035AUSA ,1A, 76V, High-Efficiency MAXPower Step-Down DC-DC ConverterApplicationsMAX5035BUSA 0°C to +85°C 8 SO5.0Consumer ElectronicsMAX5035BUPA 0°C to +85°C 8 PDIPIndu ..
MAX5035AUSA+ ,1A, 76V, High-Efficiency MAXPower Step-Down DC-DC ConverterFeaturesThe MAX5035 easy-to-use, high-efficiency, high-volt-♦ Wide 7.5V to 76V Input Voltage Rangea ..
MAX5035BASA ,1A, 76V, High-Efficiency MAXPower Step-Down DC-DC ConverterELECTRICAL CHARACTERISTICS (MAX5035_U_ _)(V = +12V, V = +12V, I = 0, T = 0°C to +85°C, unless other ..
MAX5035BASA ,1A, 76V, High-Efficiency MAXPower Step-Down DC-DC ConverterApplicationsMAX5035BUSA 0°C to +85°C 8 SOMAX5035BUPA 0°C to +85°C 8 PDIPAutomotive5.0MAX5035BASA -4 ..
MAX5035BASA+ ,1A, 76V, High-Efficiency MAXPower Step-Down DC-DC ConverterApplicationsMAX5035BUSA 0°C to +85°C 8 SOMAX5035BUPA 0°C to +85°C 8 PDIPAutomotive5.0MAX5035BASA -4 ..
MAX1977EEI-MAX1999EEI
High-Efficiency / Quad Output / Main Power- Supply Controllers for Notebook Computers
General DescriptionThe MAX1777/MAX1977/MAX1999 dual step-down,
switch-mode power-supply (SMPS) controllers generate
logic-supply voltages in battery-powered systems. The
MAX1777/MAX1977/MAX1999 include two pulse-width
modulation (PWM) controllers, adjustable from 2V to 5.5V
or fixed at 5V and 3.3V. These devices feature two linear
regulators providing 5V and 3.3V always-on outputs.
Each linear regulator provides up to 100mA output cur-
rent with automatic linear regulator bootstrapping to the
main SMPS outputs. The MAX1777/MAX1977/MAX1999
include on-board power-up sequencing, a power-good
(PGOOD) output, digital soft-start, and internal soft-stop
output discharge that prevents negative voltages on shut-
down.
Maxim’s proprietary Quick-PWM™ quick-response, con-
stant on-time PWM control scheme operates without
sense resistors and provides 100ns response to load
transients while maintaining a relatively constant switch-
ing frequency. The unique ultrasonic pulse-skipping
mode maintains the switching frequency above 25kHz,
which eliminates noise in audio applications. Other fea-
tures include pulse skipping, which maximizes efficiency
in light-load applications, and fixed-frequency PWM
mode, which reduces RF interference in sensitive appli-
cations.
The MAX1777 features a 200kHz/5V and 300kHz/3.3V
SMPS for highest efficiency, while the MAX1977 features
a 400kHz/5V and 500kHz/3.3V SMPS for “thin and light”
applications. The MAX1999 provides a pin-selectable
switching frequency, allowing either 200kHz/300kHz or
400kHz/500kHz operation of the 5V/3.3V SMPSs, respec-
tively. The MAX1777/MAX1977/MAX1999 are available in
28-pin QSOP packages and operate over the extended
temperature range (-40°C to +85°C). The MAX1777/
MAX1977/MAX1999 are available in lead-free packages.
ApplicationsNotebook and Subnotebook Computers
PDAs and Mobile Communication Devices
3- and 4-Cell Li+ Battery-Powered Devices
FeaturesNo Current-Sense Resistor Needed (MAX1999)Accurate Current Sense with Current-Sense
Resistor (MAX1777/MAX1977)1.5% Output Voltage Accuracy3.3V and 5V 100mA Bootstrapped Linear
RegulatorsInternal Soft-Start and Soft-Stop Output
DischargeQuick-PWM with 100ns Load Step Response3.3V and 5V Fixed or Adjustable Outputs
(Dual Mode™)4.5V to 24V Input Voltage RangeUltrasonic Pulse-Skipping Mode (25kHz min)Power-Good (PGOOD) SignalOvervoltage Protection Enable/Disable
MAX1777/MAX1977/MAX1999
High-Efficiency, Quad Output, Main Power-
Supply Controllers for Notebook Computers
Ordering Information19-2187; Rev 1; 9/04
Quick-PWM and Dual Mode are trademarks of Maxim
Integrated Products, Inc.
Pin Configurations
Pin Configurations continued at end of data sheet.+Denotes lead-free package.
MAX1777/MAX1977/MAX1999
High-Efficiency, Quad Output, Main Power-
Supply Controllers for Notebook Computers
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(Circuit of Figure 1 and Figure 2, no load on LDO5, LDO3, OUT3, OUT5, and REF, V+ = 12V, ON3 = ON5 = VCC, VSHDN= 5V,
= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°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.
V+, SHDNto GND..................................................-0.3V to +25V
BST_ to GND..........................................................-0.3V to +30V
LX_ to BST_..............................................................-6V to +0.3V
CS_ to GND (MAX1777/MAX1977 only)......................-2V to +6V
VCC, LDO5, LDO3, OUT3, OUT5, ON3, ON5, REF,
FB3, FB5, SKIP, PRO, PGOOD to GND...............-0.3V to +6V
DH3 to LX3..............................................-0.3V to (VBST3+ 0.3V)
DH5 to LX5..............................................-0.3V to (VBST5+ 0.3V)
ILIM3, ILIM5 to GND...................................-0.3V to (VCC+ 0.3V)
DL3, DL5 to GND....................................-0.3V to (VLDO5+ 0.3V)
TON to GND (MAX1999 only)...................................-0.3V to +6V
LDO3, LDO5, REF Short Circuit to GND....................Momentary
LDO3 Current (Internal Regulator) Continuous..............+100mA
LDO3 Current (Switched Over to OUT3) Continuous.....+200mA
LDO5 Current (Internal Regulator) Continuous..............+100mA
LDO5 Current (Switched Over to OUT5) Continuous.....+200mA
Continuous Power Dissipation
28-Pin QSOP (derate 10.8mW/°C above +70°C).........860mW
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
MAX1777/MAX1977/MAX1999
High-Efficiency, Quad Output, Main Power-
Supply Controllers for Notebook Computers
ELECTRICAL CHARACTERISTICS (continued)(Circuit of Figure 1 and Figure 2, no load on LDO5, LDO3, OUT3, OUT5, and REF, V+ = 12V, ON3 = ON5 = VCC, VSHDN= 5V,
MAX1777/MAX1977/MAX1999
High-Efficiency, Quad Output, Main Power-
Supply Controllers for Notebook Computers
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1 and Figure 2, no load on LDO5, LDO3, OUT3, OUT5, and REF, V+ = 12V, ON3 = ON5 = VCC, VSHDN= 5V,
MAX1777/MAX1977/MAX1999
High-Efficiency, Quad Output, Main Power-
Supply Controllers for Notebook Computers
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1 and Figure 2, no load on LDO5, LDO3, OUT3, OUT5, and REF, V+ = 12V, ON3 = ON5 = VCC, VSHDN= 5V,= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1and Figure 2, no load on LDO5, LDO3, OUT3, OUT5, and REF, V+ = 12V, ON3 = ON5 = VCC, VSHDN= 5V,
MAX1777/MAX1977/MAX1999
High-Efficiency, Quad Output, Main Power-
Supply Controllers for Notebook Computers
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1and Figure 2, no load on LDO5, LDO3, OUT3, OUT5, and REF, V+ = 12.0.V, ON3 = ON5 = VCC, VSHDN= 5V,
MAX1777/MAX1977/MAX1999
High-Efficiency, Quad Output, Main Power-
Supply Controllers for Notebook Computers
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1and Figure 2, no load on LDO5, LDO3, OUT3, OUT5, and REF, V+ = 12.0.V, ON3 = ON5 = VCC, VSHDN= 5V, = -40°C to +85°C, unless otherwise noted.) (Note 1)
Note 1:Specifications to -40°C are guaranteed by design, not production tested.
MAX1777/MAX1977/MAX1999
High-Efficiency, Quad Output, Main Power-
Supply Controllers for Notebook Computers
Typical Operating Characteristics
(Circuit of Figure 1 and Figure 2, no load on LDO5, LDO3, OUT3, OUT5, and REF, V+ = 12V, ON3 = ON5 = VCC, SHDN= V+,
RCS= 7mΩ, VILIM_ = 0.5V, TA= +25°C, unless otherwise noted.)
MAX1777/MAX1977/MAX1999
High-Efficiency, Quad Output, Main Power-
Supply Controllers for Notebook Computersypical Operating Characteristics (continued)
(Circuit of Figure 1 and Figure 2, no load on LDO5, LDO3, OUT3, OUT5, and REF, V+ = 12V, ON3 = ON5 = VCC, SHDN= V+,
RCS= 7mΩ, VILIM_ = 0.5V, TA= +25°C, unless otherwise noted.)
MAX1777/MAX1977/MAX1999
High-Efficiency, Quad Output, Main Power-
Supply Controllers for Notebook Computers
Typical Operating Characteristics (continued)
(Circuit of Figure 1 and Figure 2, no load on LDO5, LDO3, OUT3, OUT5, and REF, V+ = 12V, ON3 = ON5 = VCC, SHDN= V+,
RCS= 7mΩ, VILIM_ = 0.5V, TA= +25°C, unless otherwise noted.)
MAX1777/MAX1977/MAX1999
High-Efficiency, Quad Output, Main Power-
Supply Controllers for Notebook Computers
Typical Operating Characteristics (continued)
(Circuit of Figure 1 and Figure 2, no load on LDO5, LDO3, OUT3, OUT5, and REF, V+ = 12V, ON3 = ON5 = VCC, SHDN= V+,
RCS= 7mΩ, VILIM_ = 0.5V, TA= +25°C, unless otherwise noted.)
MAX1777/MAX1977/MAX1999
High-Efficiency, Quad Output, Main Power-
Supply Controllers for Notebook Computers
MAX1777/MAX1977/MAX1999
High-Efficiency, Quad Output, Main Power-
Supply Controllers for Notebook Computers
Pin Description (continued)
MAX1777/MAX1977/MAX1999
High-Efficiency, Quad Output, Main Power-
Supply Controllers for Notebook Computers
Typical Application Circuit
The typical application circuits (Figures 1 and 2) gener-
ate the 5V/5A and 3.3V/5A main supplies in a notebook
computer. The input supply range is 7V to 24V. Table 1
lists component suppliers.
Detailed Description
The MAX1777/MAX1977/MAX1999 dual-buck, BiCMOS,
switch-mode power-supply controllers generate logic
supply voltages for notebook computers.The
MAX1777/MAX1977/MAX1999 are designed primarily
for battery-powered applications where high-efficiency
and low-quiescent supply current are critical.
The MAX1777 is optimized for highest efficiency with a
5V/200kHz SMPS and a 3.3V/300kHz SMPS, while the
Figure 1. MAX1777/MAX1977 Typical Application Circuit
MAX1777/MAX1977/MAX1999
High-Efficiency, Quad Output, Main Power-
Supply Controllers for Notebook Computers
Figure 2. MAX1999 Typical Application Circuit
MAX1777/MAX1977/MAX1999
High-Efficiency, Quad Output, Main Power-
Supply Controllers for Notebook Computers
MAX1977 is optimized for “thin and light” applications with a
5V/400kHz SMPS and a 3.3V/500kHz SMPS. The MAX1999
provides a pin-selectable switching frequency, allowing
either 200kHz/300kHz or 400kHz/500kHz operation of the
5V/3.3V SMPSs, respectively.
Light-load efficiency is enhanced by automatic Idle
Mode™ operation, a variable-frequency pulse-skipping
mode that reduces transition and gate-charge losses.
Each step-down, power-switching circuit consists of two
N-channel MOSFETs, a rectifier, and an LC output filter.
The output voltage is the average AC voltage at the
switching node, which is regulated by changing the duty
cycle of the MOSFET switches. The gate-drive signal to
the N-channel high-side MOSFET must exceed the
battery voltage, and is provided by a flying-capacitor
boost circuit that uses a 100nF capacitor connected to
BST_.
Figure 3. Detailed Functional Diagram
Idle Mode is a trademark of Maxim Integrated Products, Inc.
