OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

MAX1777EEI+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P32
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
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
MAX1777/MAX1977/MAX1999
High-Efficiency, Quad Output, Main Power-
Supply Controllers for Notebook Computers
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
19-2187; Rev 1; 9/04
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.
PART
TEMP RANGE
PIN-
PACKAGE
5V/3V
SWITCHING
FREQUENCY
MAX1777EEI
-40°C to +85°C 28 QSOP
200kH z/300kH z
MAX1777EEI+
-40°C to +85°C 28 QSOP
200kH z/300kH z
MAX1977EEI
-40°C to +85°C 28 QSOP
400kH z/500kH z
MAX1977EEI+
-40°C to +85°C 28 QSOP
400kH z/500kH z
MAX1999EEI
-40°C to +85°C 28 QSOP
200kH z/300kH z or
400kH z/500kH z
MAX1999EEI+
-40°C to +85°C 28 QSOP
200kH z/300kH z or
400kH z/500kH z
Quick-PWM and Dual Mode are trademarks of Maxim
Integrated Products, Inc.
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
BST3
LX3
DH3
LDO3
DL3
GND
LX5
OUT3
OUT5
V+
DL5
LDO5
V
CC
DH5
BST5
TON
ILIM5
FB5
REF
FB3
ILIM3
ON5
ON3
PGOOD
N.C.
QSOP
TOP VIEW
MAX1999
SHDN
PRO
SKIP
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
2 _______________________________________________________________________________________
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 = V
CC
, V
SHDN
= 5V,
T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +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+, 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
V
CC
, LDO5, LDO3, OUT3, OUT5, ON3, ON5, REF,
FB3, FB5, SKIP, PRO, PGOOD to GND ...............-0.3V to +6V
DH3 to LX3..............................................-0.3V to (V
BST3
+ 0.3V)
DH5 to LX5..............................................-0.3V to (V
BST5
+ 0.3V)
ILIM3, ILIM5 to GND...................................-0.3V to (V
CC
+ 0.3V)
DL3, DL5 to GND....................................-0.3V to (V
LDO5
+ 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
PARAMETER CONDITIONS
MIN
MAX
UNITS
MAIN SMPS CONTROLLERS
LDO5 in regulation 6 24
V+ Input Voltage Range
V+ = LDO5, V
OUT5
< 4.43V 4.5 5.5
V
3.3V Output Voltage in
Fixed Mode
V+ = 6V to 24V, FB3 = GND, V
SKIP
= 5V
3.285 3.330 3.375
V
V+ = 6V to 24V, FB5 = GND, V
SKIP
= 5V,
MAX1777/MAX1999 (TON = V
CC
)
5V Output Voltage in Fixed Mode
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
Either SMPS, V
SKIP
= 5V, 0 to 5A
-0.1
Either SMPS, SKIP = GND, 0 to 5A
-1.5
DC Load Regulation
Either SMPS, V
SKIP
= 2V, 0 to 5A
-1.7
%
Line Regulation Either SMPS, 6V < V+ < 24V
0.005
%/V
Current-Limit Threshold
(Positive, Default)
ILIM_ = V
CC
, GND - CS_ (MAX1777/MAX1977),
GND - LX_ (MAX1999)
93
100
107 mV
V
ILIM_
= 0.5V 40 50 60
V
ILIM_
= 1V 93
100
107
Current-Limit Threshold
(Positive, Adjustable)
GND - CS_
(MAX1777/MAX1977),
GND - LX_ (MAX1999)
V
ILIM_
= 2V
185 200
215
mV
Zero-Current Threshold
SKIP = GND, ILIM_ = V
CC
, GND - CS_
(MAX1777/MAX1977), GND - LX_ (MAX1999)
3mV
Current-Limit Threshold
(Negative, Default)
SKIP = ILIM_ = V
CC
, GND - CS_ (MAX1777/MAX1977),
GND - LX_ (MAX1999)
-120
mV
Soft-Start Ramp Time Zero to full limit 1.7 ms
MAX1777/MAX1977/MAX1999
High-Efficiency, Quad Output, Main Power-
Supply Controllers for Notebook Computers
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1 and Figure 2, no load on LDO5, LDO3, OUT3, OUT5, and REF, V+ = 12V, ON3 = ON5 = V
CC
, V
SHDN
= 5V,
T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER CONDITIONS
MIN TYP MAX
UNITS
5V SMPS
200
MAX1777 or MAX1999
(V
TON
= 5V), SKIP = V
CC
3.3V SMPS
300
5V SMPS
400
MAX1977 or MAX1999
(V
TON
= 0), SKIP = V
CC 3.3V SMPS
500
Operating Frequency
SKIP = REF 25 36
kHz
V
OUT5
= 5.05V
1.895 2.105 2.315
MAX1777 or MAX1999
(V
TON
= 5V)
V
OUT3
= 3.33V
0.833 0.925 1.017
V
OUT5
= 5.05V
0.895 1.052 1.209
On-Time Pulse Width
MAX1977 or MAX1999
(V
TON
= 0)
V
OUT3
= 3.33V
0.475 0.555 0.635
µs
Minimum Off-Time
250 300
350 ns
V
OUT5
= 5.05V 94
MAX1777 or MAX1999
(V
TON
= 5V)
V
OUT3
= 3.33V 91
V
OUT5
= 5.05V 88
Maximum Duty Cycle
MAX1977 or MAX1999
(V
TON
= 0)
V
OUT3
= 3.33V 85
%
INTERNAL REGULATOR AND REFERENCE
LDO5 Output Voltage
ON3 = ON5 = GND, 6V < V+ < 24V, 0 < I
LDO5
< 100mA 4.90 5.00 5.10
V
LDO5 Short-Circuit Current LDO5 = GND
190
mA
LDO5 Undervoltage Lockout
Fault Threshold
Falling edge of LDO5, hysteresis = 1% 3.7 4.0 4.3 V
LDO5 Bootstrap Switch Threshold
Falling edge of OUT5, rising edge at OUT5 regulation
point
4.43 4.56 4.69
V
LDO5 Bootstrap
Switch Resistance
LDO5 to OUT5, V
OUT5
= 5V 1.4 3.2 Ω
LDO3 Output Voltage
ON3 = ON5 = GND, 6V < V+ < 24V, 0 < I
LDO3
< 100mA 3.28 3.35 3.42
V
LDO3 Short-Circuit Current LDO3 = GND
180
mA
LDO3 Bootstrap Switch Threshold
Falling edge of OUT3, rising edge at OUT3 regulation
point
2.80 2.91 3.02
V
LDO3 Bootstrap Switch
Resistance
LDO3 to OUT3, V
OUT3
= 3.2V 1.5 3.5 Ω
REF Output Voltage No external load
1.980 2.000 2.020
V
REF Load Regulation 0 < I
LOAD
< 50µA 10 mV
REF Sink Current REF in regulation 10 µA
V+ Operating Supply Current LDO5 switched over to OUT5, 5V SMPS 25 50 µA
V+ Standby Supply Current V+ = 6V to 24V, both SMPSs off, includes I
SHDN
150
250 µA
V+ Shutdown Supply Current V+ = 4.5V to 24V 6 15 µA
Quiescent Power Consumption
Both SMPSs on, FB3 = FB5 = SKIP = GND, V
OUT3
=
3.5V, V
OUT5
= 5.3V
3 4.5 mW
FAULT DETECTION
Overvoltage Trip Threshold FB3 or FB5 with respect to nominal regulation point +8
+11
+14 %
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P32

MAX1777EEI+

Mfr. #:
Buy MAX1777EEI+
Manufacturer:
Maxim Integrated
Description:
Switching Controllers Quad-Out Main Power Sply Ctlr for Ntbk
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet