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PDF MAX1999 Data sheet ( Hoja de datos )
| Número de pieza | MAX1999 | |
| Descripción | High-Efficiency / Quad Output / Main Power- Supply Controllers for Notebook Computers | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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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.
1 page  
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, V SHDN = 5V,
TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
OUT3, OUT5 Discharge-Mode
On-Resistance
12 40
Ω
OUT3, OUT5 Discharge-Mode
Synchronous Rectifier
Turn-On Level
0.2 0.3 0.4
V
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 = -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETER
MAIN SMPS CONTROLLERS
V+ Input Voltage Range
3.3V Output Voltage in
Fixed Mode
CONDITIONS
LDO5 in regulation
V+ = LDO5, VOUT5 < 4.41V
V+ = 6V to 24V, FB3 = GND, V SKIP = 5V
MIN TYP MAX UNITS
6 24
V
4.5 5.5
3.27 3.39 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)
4.95 5.15 V
Output Voltage in
Adjustable Mode
Output Voltage Adjust Range
V+ = 6V to 24V, either SMPS
Either SMPS
1.97 2.03 V
2.0 5.5 V
FB3, FB5 Adjustable-Mode
Threshold Voltage
Dual-mode comparator
0.1 0.2 V
Current-Limit Threshold
(Positive, Default)
ILIM_ = VCC, GND - CS_ (MAX1777/MAX1977),
GND - LX_ (MAX1999)
Current-Limit Threshold
(Positive, Adjustable)
On-Time Pulse Width
Minimum Off-Time
GND - CS_
(MAX1777/MAX1977),
GND - LX_ (MAX1999)
MAX1777 or MAX1999
(VTON = 5V)
MAX1977 or MAX1999
(VTON = 0)
VILIM_ = 0.5V
VILIM_ = 1V
VILIM_ = 2V
VOUT5 = 5.05V
VOUT3 = 3.33V
VOUT5 = 5.05V
VOUT3 = 3.33V
INTERNAL REGULATOR AND REFERENCE
LDO5 Output Voltage
ON3 = ON5 = GND, 6V < V+ < 24V, 0 < ILDO5 < 100mA
LDO5 Undervoltage
Lockout Fault Threshold
Falling edge of LDO5, hysteresis = 1%
90
40
90
180
1.895
0.833
0.895
0.475
200
4.90
3.7
110
60
110
220
2.315
1.017
1.209
0.635
400
mV
mV
µs
ns
5.10 V
4.3 V
_______________________________________________________________________________________ 5
5 Page 
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.)
MAX1977/MAX1999 (TON = GND)
5V PWM-MODE
LOAD TRANSIENT RESPONSE
MAX1777 toc28
MAX1777/MAX1999 (TON = VCC)
3.3V PWM-MODE
LOAD TRANSIENT RESPONSE
MAX1777 toc29
MAX1977/MAX1999 (TON = GND)
3.3V PWM-MODE
LOAD TRANSIENT RESPONSE
MAX1777 toc30
VOUT,
VOUT,
VOUT,
AC- AC-
AC-
5V COUPLED 3.3V COUPLED 3.3V COUPLED
100mV/div
100mV/div
100mV/div
4A INDUCTOR 4A INDUCTOR 4A INDUCTOR
CURRENT
CURRENT
CURRENT
1A
2A/div
1A
2A/div
1A
2A/div
5V 5V
5V
DL5 DL3
DL3
0
5V/div
0
5V/div
0
5V/div
10µs/div
20µs/div
10µs/div
5V ULTRASONIC EFFICIENCY
vs. LOAD CURRENT (TON = VCC)
100
90
80
VIN = 12V
70
60 VIN = 24V
50
40
30
20
10
0
0.001
0.01 0.1
1
LOAD CURRENT (A)
10
5V ULTRASONIC EFFICIENCY
vs. LOAD CURRENT (TON = GND)
100
90 VIN = 12V
80
70 VIN = 24V
60
50
40
30
20
10
0
0.001
0.01 0.1
1
LOAD CURRENT (A)
10
3.3V ULTRASONIC EFFICIENCY
vs. LOAD CURRENT (TON = VCC)
100
90
80
70 VIN = 7V
60
VIN = 12V
50
40
30 VIN = 24V
20
10
0
0.001
0.01 0.1
1
LOAD CURRENT (A)
10
3.3V ULTRASONIC EFFICIENCY
vs. LOAD CURRENT (TON = GND)
100
90 VIN = 7V
80
70 VIN = 12V
60
50 VIN = 24V
40
30
20
10
0
0.001
0.01 0.1
1
LOAD CURRENT (A)
10
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MAX1999.PDF ] | |
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