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PDF MAX1634A Data sheet ( Hoja de datos )
| Número de pieza | MAX1634A | |
| Descripción | (MAX1630A - MAX1635A) Multi Output Low Noise Power Supply Controllers | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-3518; Rev 1; 8/05
EVAALVUAAILTAIOBNLEKIT
Multi-Output, Low-Noise Power-Supply
Controllers for Notebook Computers
________________General Description ____________________________Features
The MAX1630A–MAX1635A are buck-topology, step- ♦ 96% Efficiency
down, switch-mode, power-supply controllers that gener- ♦ +4.2V to +30V Input Range
ate logic-supply voltages in battery-powered systems.
These high-performance, dual-/triple-output devices
include on-board power-up sequencing, power-good
signaling with delay, digital soft-start, secondary winding
control, low-dropout circuitry, internal frequency-com-
♦ 2.5V to 5.5V Dual Adjustable Outputs
♦ Selectable 3.3V and 5V Fixed or Adjustable
Outputs (Dual Mode™)
♦ 12V Linear Regulator
pensation networks, and automatic bootstrapping.
Up to 96% efficiency is achieved through synchronous
rectification and Maxim’s proprietary Idle Mode™ control
♦ Adjustable Secondary Feedback
(MAX1631A/MAX1634A)
♦ 5V/50mA Linear Regulator Output
scheme. Efficiency is greater than 80% over a 1000:1 ♦ Precision 2.5V Reference Output
load-current range, which extends battery life in system- ♦ Programmable Power-Up Sequencing
suspend or standby mode. Excellent dynamic response ♦ Power-Good (RESET) Output
corrects output load transients caused by the latest
dynamic-clock CPUs within five 300kHz clock cycles.
Strong 1A on-board gate drivers ensure fast external
♦ Output Overvoltage Protection
(MAX1630A/MAX1631A/MAX1632A)
n-channel MOSFET switching.
♦ Output Undervoltage Shutdown
(MAX1630A/MAX1631A/MAX1632A)
These devices feature a logic-controlled and synchroniz-
able, fixed-frequency, pulse-width-modulation (PWM)
♦ 200kHz/300kHz Low-Noise, Fixed-Frequency
Operation
operating mode. This reduces noise and RF interference
in sensitive mobile communications and pen-entry appli-
♦ Low-Dropout, 99% Duty-Factor Operation
cations. Asserting the SKIP pin enables fixed-frequency
mode for lowest noise under all load conditions.
www.DataSheet4U.comThe MAX1630A–MAX1635A include two PWM regulators,
♦ 2.5mW Typical Quiescent Power (+12V Input,
Both SMPSs On)
♦ 4µA Typical Shutdown Current
adjustable from 2.5V to 5.5V with fixed 5.0V and 3.3V ♦ 28-Pin SSOP Package
modes. All these devices include secondary feedback
regulation, and the MAX1630A/MAX1632A/MAX1633A/
_______________Ordering Information
MAX1635A each contain 12V/120mA linear regulators.
The MAX1631A/MAX1634A include a secondary feed-
back input (SECFB), plus a control pin (STEER) that
PART
MAX1630AEAI
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
28 SSOP
selects which PWM (3.3V or 5V) receives the secondary +Denotes lead-free package.
feedback signal. SECFB provides a method for adjusting Ordering Information continued at end of data sheet.
the secondary winding voltage regulation point with an
external resistor-divider, and is intended to aid in creating
________________Functional Diagram
auxiliary voltages other than fixed 12V.
The MAX1630A/MAX1631A/MAX1632A contain internal
output overvoltage and undervoltage protection features.
The MAX1630A family has improved RF immunity over
the MAX1630 family.
INPUT
+5V (RTC)
5V
LINEAR
12V
LINEAR
+12V
________________________Applications
Notebook and Subnotebook Computers
PDAs and Mobile Communicators
+3.3V
3.3V
SMPS
5V
SMPS
+5V
Desktop CPU Local DC-DC Converters
Pin Configurations and Selector Guide appear at end of data
sheet.
Idle Mode and Dual Mode are trademarks of Maxim Integrated
Products, Inc.
ON/OFF
POWER-UP POWER-
SEQUENCE GOOD
RESET
________________________________________________________________ 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.
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1 page  
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Multi-Output, Low-Noise Power-Supply
Controllers for Notebook Computers
__________________________________________Typical Operating Characteristics
(Circuit of Figure 1, 3A Table 1 components, TA = +25°C, unless otherwise noted.)
EFFICIENCY vs. 5V OUTPUT CURRENT
100
V+ = 6V
90
V+ = 15V
80
70
EFFICIENCY vs. 3.3V OUTPUT CURRENT
100
V+ = 6V
90
80
V+ = 15V
70
MAX1632A/MAX1635A
MAXIMUM 15V VDD OUTPUT
CURRENT vs. SUPPLY VOLTAGE
800
VDD > 13V
5V REGULATING
600
5V LOAD = 0A
400
5V LOAD = 3A
60
50
0.001
ON5 = 5V
ON3 = 0V
f = 300kHz
MAX1631A/MAX1634A
0.01 0.1
1
5V OUTPUT CURRENT (A)
10
60
50
0.001
ON3 = ON5 = 5V
f = 300kHz
MAX1631A/MAX1634A
0.01 0.1
1
3.3V OUTPUT CURRENT (A)
10
200
0
0
5 10 15
SUPPLY VOLTAGE (V)
20
MAX1630A/MAX1633A
MAXIMUM 15V VDD OUTPUT
CURRENT vs. SUPPLY VOLTAGE
PWM MODE INPUT CURRENT
vs. INPUT VOLTAGE
IDLE MODE INPUT CURRENT
vs. INPUT VOLTAGE
500
VDD > 13V
www.DataSheet4U.com3.3V REGULATING
400
30 10
ON3 = ON5 = 5V
25
SKIP = VL
NO LOAD
ON3 = ON5 = 5V
SKIP = 0V
NO LOAD
3.3V LOAD = 0A
300
20
1
15
200
10
0.1
100
3.3V LOAD = 3A
5
0
0
10,000
1000
5 10 15
SUPPLY VOLTAGE (V)
STANDBY INPUT CURRENT
vs. INPUT VOLTAGE
20
ON3 = ON5 = 0V
NO LOAD
100
10
1
0
5 10 15 20 25 30
INPUT VOLTAGE (V)
0
0
5 10 15 20 25
INPUT VOLTAGE (V)
SHUTDOWN INPUT CURRENT
vs. INPUT VOLTAGE
10
SHDN = 0V
8
30
6
4
2
0
0
5 10 15 20 25 30
INPUT VOLTAGE (V)
0.01
0
5 10 15 20 25 30
INPUT VOLTAGE (V)
MINIMUM VIN TO VOUT DIFFERENTIAL
vs. 5V OUTPUT CURRENT
1000
100
10
5V, 3A CIRCUIT
VOUT > 4.8V
f = 300kHz
1
0.001
0.01
0.1
1
5V OUTPUT CURRENT (A)
10
_______________________________________________________________________________________ 5
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Multi-Output, Low-Noise Power-Supply
Controllers for Notebook Computers
INPUT
SHDN
V+ SYNC
CSL5
-
+
4.5V
MAX1632A
+5V ALWAYS ON
VL
REF
BST3
ON/OFF
5V
LINEAR
REG
2.5V
REF
12V
LINEAR IN
REG
SECFB
+
-
13V
12OUT
VDD
BST5
+12V
RAW +15V
DH3 DH5
+3.3V
LX3 3.3V
DL3
VL
PWM
LOGIC
200kHz
TO
300kHz
5V
PWM
LOGIC
VL
LX5
DL5
+5V
OSC PGND
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CSH3
CSL3
-
REF
LPF
60kHz
FAULT
1.75V
2.68V
REF
LPF
60kHz
CSH5
+ CSL5
2.388V
R1 - - R3
FB3
OUTPUTS
FB5
R2 - UP
R4
++
0.6V 0.6V
VL
TIMER
RESET
TIME/ON5
+
REF -
POWER-ON
SEQUENCE
LOGIC
RUN/ON3
2.6V
+
- 1V
GND
SEQ
Figure 2. MAX1632A Block Diagram
______________________________________________________________________________________ 11
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| Páginas | Total 29 Páginas | |
| PDF Descargar | [ Datasheet MAX1634A.PDF ] | |
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