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MAX1632EAI maxim 美信芯片 电子元器件中文版规格手册.pdf
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MAX1632EAI maxim 美信芯片 电子元器件中文版规格手册
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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.
________________General Description
The MAX1630–MAX1635 are buck-topology, step-down,
switch-mode, power-supply controllers that generate
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-compensation net-
works, and automatic bootstrapping.
Up to 96% efficiency is achieved through synchronous
rectification and Maxim’s proprietary Idle Mode™ control
scheme. Efficiency is greater than 80% over a 1000:1
load-current range, which extends battery life in system-
suspend or standby mode. Excellent dynamic response
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
N-channel MOSFET switching.
These devices feature a logic-controlled and synchroniz-
able, fixed-frequency, pulse-width-modulation (PWM)
operating mode. This reduces noise and RF interference
in sensitive mobile communications and pen-entry appli-
cations. Asserting the SKIP pin enables fixed-frequency
mode, for lowest noise under all load conditions.
The MAX1630–MAX1635 include two PWM regulators,
adjustable from 2.5V to 5.5V with fixed 5.0V and 3.3V
modes. All these devices include secondary feedback
regulation, and the MAX1630/MAX1632/MAX1633/
MAX1635 each contain 12V/120mA linear regulators. The
MAX1631/MAX1634 include a secondary feedback input
(SECFB), plus a control pin (STEER) that selects which
PWM (3.3V or 5V) receives the secondary feedback sig-
nal. SECFB provides a method for adjusting the sec-
ondary winding voltage regulation point with an external
resistor divider, and is intended to aid in creating auxiliary
voltages other than fixed 12V.
The MAX1630/MAX1631/MAX1632 contain internal out-
put overvoltage and undervoltage protection features.
________________________Applications
Notebook and Subnotebook Computers
PDAs and Mobile Communicators
Desktop CPU Local DC-DC Converters
____________________________Features
♦ 96% Efficiency
♦ +4.2V to +30V Input Range
♦ 2.5V to 5.5V Dual Adjustable Outputs
♦ Selectable 3.3V and 5V Fixed or Adjustable
Outputs (Dual Mode™)
♦ 12V Linear Regulator
♦ Adjustable Secondary Feedback
(MAX1631/MAX1634)
♦ 5V/50mA Linear Regulator Output
♦ Precision 2.5V Reference Output
♦ Programmable Power-Up Sequencing
♦ Power-Good (RESET) Output
♦ Output Overvoltage Protection
(MAX1630/MAX1631/MAX1632)
♦ Output Undervoltage Shutdown
(MAX1630/MAX1631/MAX1632)
♦ 200kHz/300kHz Low-Noise, Fixed-Frequency
Operation
♦ Low-Dropout, 99% Duty-Factor Operation
♦ 2.5mW Typical Quiescent Power (+12V input, both
SMPSs on)
♦ 4μA Typical Shutdown Current
♦ 28-Pin SSOP Package
MAX1630–MAX1635
Multi-Output, Low-Noise Power-Supply
Controllers for Notebook Computers
________________________________________________________________ Maxim Integrated Products 1
5V
LINEAR
12V
LINEAR
POWER-UP
SEQUENCE
POWER-
GOOD
3.3V
SMPS
5V
SMPS
RESETON/OFF
+5V (RTC)
+3.3V
INPUT
+5V
+12V
________________Functional Diagram
19-0480; Rev 4; 8/05
EVALUATION KIT
AVAILABLE
_______________Ordering Information
Ordering Information continued at end of data sheet.
Pin Configurations and Selector Guide appear at end of data
sheet.
Idle Mode and Dual Mode are trademarks of Maxim Integrated
Products.
+ Denotes lead-free package.
PART TEMP RANGE
PIN-PACKAGE
MAX1630CAI 0°C to +70°C 28 SSOP
MAX1630CAI+ 0°C to +70°C 28 SSOP
MAX1630EAI+ -40°C to +85°C 28 SSOP
MAX1630–MAX1635
Multi-Output, Low-Noise Power-Supply
Controllers for Notebook Computers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V+ = 15V, both PWMs on, SYNC = VL, VL load = 0mA, REF load = 0mA, SKIP = 0V, T
A
= T
MIN
to T
MAX
, 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+ to GND ..............................................................-0.3V to +36V
PGND to GND.....................................................................±0.3V
VL to GND ................................................................-0.3V to +6V
BST3, BST5 to GND ...............................................-0.3V to +36V
LX3 to BST3..............................................................-6V to +0.3V
LX5 to BST5..............................................................-6V to +0.3V
REF, SYNC, SEQ, STEER, SKIP, TIME/ON5,
SECFB, RESET to GND ............................................-0.3V to +6V
V
DD
to GND............................................................-0.3V to +20V
RUN/ON3, SHDN to GND.............................-0.3V to (V+ + 0.3V)
12OUT to GND ...........................................-0.3V to (V
DD
+ 0.3V)
DL3, DL5 to PGND........................................-0.3V to (VL + 0.3V)
DH3 to LX3 ...............................................-0.3V to (BST3 + 0.3V)
DH5 to LX5 ...............................................-0.3V to (BST5 + 0.3V)
VL, REF Short to GND ................................................Momentary
12OUT Short to GND..................................................Continuous
REF Current...........................................................+5mA to -1mA
VL Current.........................................................................+50mA
12OUT Current ...............................................................+200mA
V
DD
Shunt Current............................................................+15mA
Operating Temperature Ranges
MAX163_CAI.......................................................0°C to +70°C
MAX163_EAI....................................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +160°C
Continuous Power Dissipation (T
A
= +70°C)
SSOP (derate 9.52mW/°C above +70°C) ....................762mW
Lead Temperature (soldering, 10s) .................................+300°C
CONDITIONS
V4.2 30.0Input Voltage Range
UNITSMIN TYP MAXPARAMETER
Either SMPS
V+ = 4.2V to 30V, CSH3–CSL3 = 0V,
CSL3 tied to FB3
VREF 5.5
V2.42 2.5 2.58
3V Output Voltage in
Adjustable Mode
Output Voltage Adjust Range
Either SMPS, 5.2V < V+ < 30V %/V0.03
Either SMPS, 0V < CSH_–CSL_ < 80mV
Line Regulation
Dual Mode comparator
%-2
V0.5 1.1Adjustable-Mode Threshold Voltage
Load Regulation
SYNC = VL
From enable to 95% full current limit with respect to
f
OSC
(Note 1)
270 300 330
Clk512
SKIP = 0V, not tested
Soft-Start Ramp Time
mV10 25 40Idle Mode Threshold
SYNC = 0V
kHz
170 200 230
Oscillator Frequency
V+ = 4.2V to 30V, 0mV < CSH3–CSL3 < 80mV,
FB3 = 0V
V3.20 3.39 3.473V Output Voltage in Fixed Mode
V+ = 4.2V to 30V, CSH5–CSL5 = 0V,
CSL5 tied to FB5
V2.42 2.5 2.58
5V Output Voltage in
Adjustable Mode
V+ = 5.2V to 30V, 0mV < CSH–CSL5 < 80mV,
FB5 = 0V
V4.85 5.13 5.255V Output Voltage in Fixed Mode
SYNC = VL 97 98
SYNC = 0V (Note 2)
%
98 99
Maximum Duty Factor
CSH3–CSL3 or CSH5–CSL5 80 100 120
SKIP = VL or V
DD
< 13V or SECFB < 2.44V
mV
-50 -100 -150
Current-Limit Threshold
MAIN SMPS CONTROLLERS
MAX1630–MAX1635
Multi-Output, Low-Noise Power-Supply
Controllers for Notebook Computers
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V+ = 15V, both PWMs on, SYNC = VL, VL load = 0mA, REF load = 0mA, SKIP = 0V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
Typical values are at T
A
= +25°C.)
V+ = VL = 0V,
CSL3 = CSH3 = CSL5 = CSH5 = 5.5V
µA0.01 10
Not tested
Current-Sense Input Leakage Current
Not tested
Rising edge, hysteresis = 1% (Note 3)
V
DD
< 13V or SECFB < 2.44V
V18 20
µs1
Falling edge (MAX1631/MAX1634)
DL Pulse Width
Falling edge (Note 3)
V
DD
Shunt Threshold
V2.44 2.60
V13 14
CONDITIONS
V
DD
Regulation Threshold
SECFB Regulation Threshold
V
DD
= 20V (Note 3)
V
DD
= 5V, off mode (Notes 3, 4) µA30V
DD
Leakage Current
mA10V
DD
Shunt Sink Current
ns200
ns200SYNC Input High Pulse Width
SYNC Input Low Pulse Width
13V < V
DD
< 18V, 0mA < I
LOAD
< 120mA V11.65 12.1 12.5012OUT Output Voltage
UNITSMIN TYP MAXPARAMETER
Not tested ns200SYNC Rise/Fall Time
kHz240 350SYNC Input Frequency Range
V
DD
= 18V, run mode, no 12OUT load
12OUT forced to 11V, V
DD
= 13V
µA50 100
mA15012OUT Current Limit
Quiescent V
DD
Current
Rising edge of CSL5, hysteresis = 1%
Falling edge, hysteresis = 1%
V4.2 4.5 4.7
V3.5 3.6 3.7
VL Undervoltage Lockout
Fault Threshold
VL Switchover Threshold
SHDN = V+, RUN/ON3 = TIME/ON5 = 0V,
5.3V < V+ < 30V, 0mA < I
LOAD
< 50mA
V4.7 5.1VL Output Voltage
Falling edge V1.8 2.4
µA10REF Sink Current
REF Fault Lockout Voltage
V+ = 4V to 24V, SHDN = 0V
V+ = 4.2V to 5.5V, both SMPSs off,
includes current into SHDN
µA410
µA50 200
V+ Standby Supply Current
in Dropout
V+ Shutdown Supply Current
V+ = 5.5V to 30V, both SMPSs off,
includes current into SHDN
VL switched over to CSL5, 5V SMPS on
µA30 60
µA550V+ Operating Supply Current
V+ Standby Supply Current
0µA < I
LOAD
< 50µA
No external load (Note 5)
12.5
V2.45 2.5 2.55REF Output Voltage
2.5 4
Both SMPSs enabled, FB3 = FB5 = 0V,
CSL3 = CSH3 = 3.5V,
CSL5 = CSH5 = 5.3V
mW
1.5 4
Quiescent Power Consumption
(Note 3)
MAX1631/
MAX1634
0mA < I
LOAD
< 5mA
mV
100.0
REF Load Regulation
FLYBACK CONTROLLER
12V LINEAR REGULATOR (Note 3)
INTERNAL REGULATOR AND REFERENCE
MAX1630–MAX1635
Multi-Output, Low-Noise Power-Supply
Controllers for Notebook Computers
4 _______________________________________________________________________________________
Note 1: Each of the four digital soft-start levels is tested for functionality; the steps are typically in 20mV increments.
Note 2: High duty-factor operation supports low input-to-output differential voltages, and is achieved at a lowered operating
frequency (see Overload and Dropout Operation section).
Note 3: MAX1630/MAX1632/MAX1633/MAX1635 only.
Note 4: Off mode for the 12V linear regulator occurs when the SMPS that has flyback feedback (V
DD
) steered to it is disabled. In
situations where the main outputs are being held up by external keep-alive supplies, turning off the 12OUT regulator pre-
vents a leakage path from the output-referred flyback winding, through the rectifier, and into V
DD
.
Note 5: Since the reference uses VL as its supply, the reference’s V+ line-regulation error is insignificant.
ELECTRICAL CHARACTERISTICS (continued)
(V+ = 15V, both PWMs on, SYNC = VL, VL load = 0mA, REF load = 0mA, SKIP = 0V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
Typical values are at T
A
= +25°C.)
Typical hysteresis = +10°C
From each SMPS enabled, with respect to f
OSC
°C150
Clk5000 6144 7000
With respect to unloaded output voltage
Output Undervoltage Lockout Time
Thermal Shutdown Threshold
With respect to f
OSC
Falling edge, CSL_ driven 2%
below RESET trip threshold
Clk27,000 32,000 37,000
µs1.5
With respect to unloaded output voltage,
falling edge; typical hysteresis = 1%
RESET Propagation Delay
RESET Delay Time
%-7 -5.5 -4
CONDITIONS
RESET Trip Threshold
RESET, I
SINK
= 4mA
RUN/ON3, SKIP, TIME/ON5 (SEQ = REF),
SHDN, STEER, SYNC, SEQ; V
PIN
= 0V or 3.3V
V0.4
µA±1Input Leakage Current
Logic Output Low Voltage
CSL_ driven 2% above overvoltage trip threshold µs
FB3, FB5; SECFB = 2.6V
1.5Overvoltage-Fault Propagation Delay
nA150
With respect to unloaded output voltage %60 70 80
Feedback Input Leakage Current
Output Undervoltage Threshold
%4710Overvoltage Trip Threshold
RUN/ON3, SKIP, TIME/ON5 (SEQ = REF),
SHDN, STEER, SYNC
RUN/ON3, SKIP, TIME/ON5 (SEQ = REF),
SHDN, STEER, SYNC
V2.4
V0.6Logic Input Low Voltage
Logic Input High Voltage
UNITSMIN TYP MAXPARAMETER
High or low
DL3, DH3, DL5, DH5; forced to 2V
Ω1.5 7
A1Gate Driver Sink/Source Current
Gate Driver On-Resistance
RESET = 3.5V
mA1Logic Output High Current
TIME/ON5 = 0V, SEQ = 0V or VL
SEQ = 0V or VL
µA2.5 3 3.5
V2.4 2.6TIME/ON5 Input Trip Level
TIME/ON5 Source Current
TIME/ON5; RUN/ON3 = 0V, SEQ = 0V or VL Ω15 80TIME/ON5 On-Resistance
FAULT DETECTION (MAX1630/MAX1631/MAX1632)
INPUTS AND OUTPUTS
RESET
MAX1630–MAX1635
Multi-Output, Low-Noise Power-Supply
Controllers for Notebook Computers
_______________________________________________________________________________________ 5
100
50
0.001 0.01 0.1 1 10
EFFICIENCY vs. 5V OUTPUT CURRENT
60
MAX1630/35-01
5V OUTPUT CURRENT (A)
EFFICIENCY (%)
70
80
90
ON5 = 5V
ON3 = 0V
f = 300kHz
MAX1631/MAX1634
V+ = 6V
V+ = 15V
100
50
0.001 0.01 0.1 1 10
EFFICIENCY vs. 3.3V OUTPUT CURRENT
60
MAX1630/35-02
3.3V OUTPUT CURRENT (A)
EFFICIENCY (%)
70
80
90
ON3 = ON5 = 5V
f = 300kHz
MAX1631/MAX1634
V+ = 6V
V+ = 15V
800
0
15 20
MAX1632/MAX1635
MAXIMUM 15V V
DD
OUTPUT
CURRENT vs. SUPPLY VOLTAGE
600
MAX 1630/35-03
SUPPLY VOLTAGE (V)
MAXIMUM OUTPUT CURRENT (mA)
0
200
10
400
5
V
DD
> 13V
5V REGULATING
5V LOAD = 0A
5V LOAD = 3A
500
0
15 20
MAX1630/MAX1633
MAXIMUM 15V V
DD
OUTPUT
CURRENT vs. SUPPLY VOLTAGE
400
MAX 1630/35-04
SUPPLY VOLTAGE (V)
MAXIMUM OUTPUT CURRENT (mA)
0
200
100
10
300
5
V
DD
> 13V
3.3V REGULATING
3.3V LOAD = 0A
3.3V LOAD = 3A
10,000
1
030
STANDBY INPUT CURRENT
vs. INPUT VOLTAGE
1000
MAX1630/35-07
INPUT VOLTAGE (V)
INPUT CURRENT (μA)
15
10
510 25
100
20
ON3 = ON5 = 0V
NO LOAD
30
0
5
030
PWM MODE INPUT CURRENT
vs. INPUT VOLTAGE
MAX1630/35-05
INPUT VOLTAGE (V)
INPUT CURRENT (mA)
15
10
15
510 25
20
25
20
ON3 = ON5 = 5V
SKIP = VL
NO LOAD
10
0.01
030
IDLE MODE INPUT CURRENT
vs. INPUT VOLTAGE
MAX1630/35-06
INPUT VOLTAGE (V)
INPUT CURRENT (mA)
15
0.1
510 25
1
20
ON3 = ON5 = 5V
SKIP = 0V
NO LOAD
10
0
030
SHUTDOWN INPUT CURRENT
vs. INPUT VOLTAGE
8
MAX1630/35-08
INPUT VOLTAGE (V)
INPUT CURRENT (
μ
A)
15
4
2
510 25
6
20
SHDN = 0V
1000
1
0.001 0.1 101
MINIMUM V
IN
TO V
OUT
DIFFERENTIAL
vs. 5V OUTPUT CURRENT
10
100
MAX1630/35-09
5V OUTPUT CURRENT (A)
MIN V
IN
TO V
OUT
DIFFERENTIAL (mV)
0.01
5V, 3A CIRCUIT
V
OUT
> 4.8V
f = 300kHz
__________________________________________Typical Operating Characteristics
(Circuit of Figure 1, 3A Table 1 components, T
A
= +25°C, unless otherwise noted.)
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