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| 型号： | MAX1777EEI+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 1/32页 |
| 文件大小： | 0K |
| 描述： | IC REG QD BUCK/LINEAR 28QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 拓扑： | 降压（降压）（2），线性（LDO）（2） |
| 功能： | 任何功能 |
| 输出数： | 4 |
| 频率 - 开关： | 200kHz ~ 500kHz |
| 电压/电流 - 输出 1： | 控制器 |
| 电压/电流 - 输出 2： | 控制器 |
| 电压/电流 - 输出 3： | 3.3V，100mA |
| 带 LED 驱动器： | 无 |
| 带监控器： | 无 |
| 带序列发生器： | 是 |
| 电源电压： | 4.5 V ~ 24 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 28-QSOP |
| 包装： | 带卷 (TR) |
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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
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
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-
PART
TEMP RANGE
PIN-
PACKAGE
5V/3V
SWITCHING
FREQUENCY
tures include pulse skipping, which maximizes efficiency
MAX1777 EEI
-40°C to +85°C 28 QSOP
200kHz/300kHz
in light-load applications, and fixed-frequency PWM
mode, which reduces RF interference in sensitive appli-
cations.
MAX1777EEI+ -40°C to +85°C 28 QSOP
MAX1977 EEI -40°C to +85°C 28 QSOP
MAX1977EEI+ -40°C to +85°C 28 QSOP
200kHz/300kHz
400kHz/500kHz
400kHz/500kHz
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”
MAX1999 EEI
-40°C to +85°C 28 QSOP
200kHz/300kHz or
400kHz/500kHz
applications. The MAX1999 provides a pin-selectable
switching frequency, allowing either 200kHz/300kHz or
MAX1999EEI+ -40°C to +85°C 28 QSOP
200kHz/300kHz or
400kHz/500kHz
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.
+Denotes lead-free package.
TOP VIEW
Pin Configurations
N.C. 1
28 BST3
Applications
Notebook and Subnotebook Computers
PDAs and Mobile Communication Devices
PGOOD 2
ON3 3
ON5 4
ILIM3 5
27 LX3
26 DH3
25 LDO3
24 DL3
3- and 4-Cell Li+ Battery-Powered Devices
Quick-PWM and Dual Mode are trademarks of Maxim
Integrated Products, Inc.
SHDN 6
FB3 7
REF 8
FB5 9
PRO 10
ILIM5 11
SKIP 12
TON 13
MAX1999
23 GND
22 OUT3
21 OUT5
20 V+
19 DL5
18 LDO5
17 V CC
16 DH5
Pin Configurations continued at end of data sheet.
BST5 14
QSOP
15 LX5
________________________________________________________________ Maxim Integrated Products
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
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