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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1777 Datasheet

High-Efficiency / Quad Output / Main Power- Supply Controllers for Notebook Computers

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19-2187; Rev 1; 9/04
High-Efficiency, Quad Output, Main Power-
Supply Controllers for Notebook Computers
General Description
The 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.
Applications
Notebook and Subnotebook Computers
PDAs and Mobile Communication Devices
3- and 4-Cell Li+ Battery-Powered Devices
Quick-PWM and Dual Mode are trademarks of Maxim
Integrated Products, Inc.
Pin Configurations continued at end of data sheet.
Features
No Current-Sense Resistor Needed (MAX1999)
Accurate Current Sense with Current-Sense
Resistor (MAX1777/MAX1977)
1.5% Output Voltage Accuracy
3.3V and 5V 100mA Bootstrapped Linear
Regulators
Internal Soft-Start and Soft-Stop Output
Discharge
Quick-PWM with 100ns Load Step Response
3.3V and 5V Fixed or Adjustable Outputs
(Dual Mode™)
4.5V to 24V Input Voltage Range
Ultrasonic Pulse-Skipping Mode (25kHz min)
Power-Good (PGOOD) Signal
Overvoltage Protection Enable/Disable
Ordering Information
PART
MAX1777EEI
TEMP RANGE
PIN-
PACKAGE
5V/3V
SWITCHING
FREQUENCY
-40°C to +85°C 28 QSOP 200kHz/300kHz
MAX1777EEI+ -40°C to +85°C 28 QSOP 200kHz/300kHz
MAX1977EEI -40°C to +85°C 28 QSOP 400kHz/500kHz
MAX1977EEI+ -40°C to +85°C 28 QSOP 400kHz/500kHz
200kHz/300kHz or
MAX1999EEI -40°C to +85°C 28 QSOP 400kHz/500kHz
MAX1999EEI+ -40°C to +85°C 28 QSOP
200kHz/300kHz or
400kHz/500kHz
+Denotes lead-free package.
Pin Configurations
TOP VIEW
N.C. 1
PGOOD 2
ON3 3
ON5 4
ILIM3 5
SHDN 6
FB3 7
REF 8
FB5 9
PRO 10
ILIM5 11
SKIP 12
TON 13
BST5 14
MAX1999
QSOP
28 BST3
27 LX3
26 DH3
25 LDO3
24 DL3
23 GND
22 OUT3
21 OUT5
20 V+
19 DL5
18 LDO5
17 VCC
16 DH5
15 LX5
________________________________________________________________ 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

MAX1777 Datasheet

High-Efficiency / Quad Output / Main Power- Supply Controllers for Notebook Computers

No Preview Available !

High-Efficiency, Quad Output, Main Power-
Supply Controllers for Notebook Computers
ABSOLUTE MAXIMUM RATINGS
V+, SHDN to 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
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 and Figure 2, no load on LDO5, LDO3, OUT3, OUT5, and REF, V+ = 12V, ON3 = ON5 = VCC, V SHDN = 5V,
TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
MAIN SMPS CONTROLLERS
V+ Input Voltage Range
3.3V Output Voltage in
Fixed Mode
CONDITIONS
LDO5 in regulation
V+ = LDO5, VOUT5 < 4.43V
V+ = 6V to 24V, FB3 = GND, V SKIP = 5V
MIN TYP MAX UNITS
6 24
4.5 5.5
3.285 3.330 3.375
V
V
5V Output Voltage in Fixed Mode
V+ = 6V to 24V, FB5 = GND, V SKIP = 5V,
MAX1777/MAX1999 (TON = VCC)
V+ = 7V to 24V, FB5 = GND, V SKIP = 5V,
MAX1977/MAX1999 (TON = GND)
4.975 5.050 5.125
V
Output Voltage in
Adjustable Mode
V+ = 6V to 24V, either SMPS
1.975 2.00 2.025
V
Output Voltage Adjust Range
Either SMPS
2.0 5.5 V
FB3, FB5 Adjustable-Mode
Threshold Voltage
Dual-mode comparator
0.1 0.2 V
DC Load Regulation
Line Regulation
Either SMPS, V SKIP = 5V, 0 to 5A
Either SMPS, SKIP = GND, 0 to 5A
Either SMPS, V SKIP = 2V, 0 to 5A
Either SMPS, 6V < V+ < 24V
-0.1
-1.5
-1.7
0.005
%
%/V
Current-Limit Threshold
(Positive, Default)
ILIM_ = VCC, GND - CS_ (MAX1777/MAX1977),
GND - LX_ (MAX1999)
93 100 107 mV
Current-Limit Threshold
(Positive, Adjustable)
Zero-Current Threshold
GND - CS_
VILIM_ = 0.5V
(MAX1777/MAX1977),
GND - LX_ (MAX1999)
VILIM_ = 1V
VILIM_ = 2V
SKIP = GND, ILIM_ = VCC, GND - CS_
(MAX1777/MAX1977), GND - LX_ (MAX1999)
40 50 60
93 100 107
185 200 215
3
mV
mV
Current-Limit Threshold
(Negative, Default)
SKIP = ILIM_ = VCC, GND - CS_ (MAX1777/MAX1977),
GND - LX_ (MAX1999)
-120
mV
Soft-Start Ramp Time
Zero to full limit
1.7 ms
2 _______________________________________________________________________________________


Part Number MAX1777
Description High-Efficiency / Quad Output / Main Power- Supply Controllers for Notebook Computers
Maker Maxim
Total Page 30 Pages
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