19-3518; Rev 1; 8/05
KIT
ATION
EVALU
BLE
AVAILA
Multi-Output, Low-Noise Power-Supply
Controllers for Notebook Computers
____________________________Features
♦
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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
(MAX1631A/MAX1634A)
5V/50mA Linear Regulator Output
Precision 2.5V Reference Output
Programmable Power-Up Sequencing
Power-Good (RESET) Output
Output Overvoltage Protection
(MAX1630A/MAX1631A/MAX1632A)
Output Undervoltage Shutdown
(MAX1630A/MAX1631A/MAX1632A)
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
________________General Description
The MAX1630A–MAX1635A are buck-topology, step-
down, switch-mode, power-supply controllers that gener-
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-
pensation networks, 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 MAX1630A–MAX1635A 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 MAX1630A/MAX1632A/MAX1633A/
MAX1635A each contain 12V/120mA linear regulators.
The MAX1631A/MAX1634A include a secondary feed-
back input (SECFB), plus a control pin (STEER) that
selects which PWM (3.3V or 5V) receives the secondary
feedback signal. SECFB provides a method for adjusting
the secondary winding voltage regulation point with an
external resistor-divider, and is intended to aid in creating
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.
MAX1630A–MAX1635A
_______________Ordering Information
PART
MAX1630AEAI
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
28 SSOP
+Denotes
lead-free package.
Ordering Information continued at end of data sheet.
________________Functional Diagram
INPUT
+5V (RTC)
5V
LINEAR
12V
LINEAR
+12V
________________________Applications
Notebook and Subnotebook Computers
PDAs and Mobile Communicators
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.
________________________________________________________________
Maxim Integrated Products
1
+3.3V
3.3V
SMPS
5V
SMPS
+5V
ON/OFF
POWER-UP
SEQUENCE
POWER-
GOOD
RESET
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.
Multi-Output, Low-Noise Power-Supply
Controllers for Notebook Computers
MAX1630A–MAX1635A
ABSOLUTE MAXIMUM RATINGS
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_ACAI ....................................................0°C to +70°C
MAX163_AEAI .................................................-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
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.
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.)
PARAMETER
MAIN SMPS CONTROLLERS
Input Voltage Range
3V Output Voltage in
Adjustable Mode
3V Output Voltage in Fixed Mode
5V Output Voltage in
Adjustable Mode
5V Output Voltage in Fixed Mode
Output Voltage Adjust Range
Adjustable-Mode Threshold Voltage
Load Regulation
Line Regulation
Current-Limit Threshold
Idle Mode Threshold
Soft-Start Ramp Time
Oscillator Frequency
Maximum Duty Factor
V+ = 4.2V to 30V, CSH3–CSL3 = 0V,
CSL3 tied to FB3
V+ = 4.2V to 30V, 0mV < CSH3–CSL3 < 80mV,
FB3 = 0V
V+ = 4.2V to 30V, CSH5–CSL5 = 0V,
CSL5 tied to FB5
V+ = 5.2V to 30V, 0mV < CSH–CSL5 < 80mV,
FB5 = 0V
Either SMPS
Dual Mode comparator
Either SMPS, 0V < CSH_- CSL_ < 80mV
Either SMPS, 5.2V < V+ < 30V
CSH3–CSL3 or CSH5–CSL5
SKIP
= VL or V
DD
< 13V or SECFB < 2.44V
SKIP
= 0V, not tested
From enable to 95% full current limit with respect to
f
OSC
(Note 1)
SYNC = VL
SYNC = 0V
SYNC = VL
SYNC = 0V (Note 2)
270
170
97
98
80
-50
10
4.2
2.42
3.20
2.42
4.85
REF
0.5
-2
0.03
100
-100
25
512
300
200
98
99
330
230
120
-150
40
2.5
3.39
2.5
5.13
30.0
2.58
3.47
2.58
5.25
5.5
1.1
V
V
V
V
V
V
V
%
%/V
mV
mV
Clks
kHz
%
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
Multi-Output, Low-Noise Power-Supply
Controllers for Notebook Computers
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.)
PARAMETER
SYNC Input High Pulse Width
SYNC Input Low Pulse Width
SYNC Rise/Fall Time
SYNC Input Frequency Range
Current-Sense Input Leakage Current
FLYBACK CONTROLLER
V
DD
Regulation Threshold
SECFB Regulation Threshold
DL Pulse Width
V
DD
Shunt Threshold
V
DD
Shunt Sink Current
V
DD
Leakage Current
12V LINEAR REGULATOR (Note 3)
12OUT Output Voltage
12OUT Current Limit
Quiescent V
DD
Current
13V < V
DD
< 18V, 0mA < I
LOAD
< 120mA
12OUT forced to 11V, V
DD
= 13V
V
DD
= 18V, run mode, no 12OUT load
SHDN
= V+, RUN/ON3 = TIME/ON5 = 0V,
5.3V < V+ < 30V, 0mA < I
LOAD
< 50mA
Falling edge, hysteresis = 1%
Rising edge of CSL5, hysteresis = 1%
No external load (Note 5)
0µA < I
LOAD
< 50µA
0mA < I
LOAD
< 5mA
10
Falling edge
VL switched over to CSL5, 5V SMPS on
V+ = 5.5V to 30V, both SMPSs off,
includes current into
SHDN
V+ = 4.2V to 5.5V, both SMPSs off,
includes current into
SHDN
V+ = 4V to 24V,
SHDN
= 0V
Both SMPSs enabled, FB3 = FB5 = 0V, (Note 3)
CSL3 = CSH3 = 3.5V,
MAX1631A/
CSL5 = CSH5 = 5.3V
MAX1634A
1.8
5
30
50
4
2.5
1.5
2.4
50
60
200
10
4
4
mW
11.65
12.1
150
50
100
12.50
V
mA
µA
Falling edge (Note 3)
Falling edge (MAX1631A/MAX1634A)
V
DD
< 13V or SECFB < 2.44V
Rising edge, hysteresis = 1% (Note 3)
V
DD
= 20V (Note 3)
V
DD
= 5V, off mode (Notes 3, 4)
18
10
30
13
2.44
1
20
14
2.60
V
V
µs
V
mA
µA
V+ = VL = 0V,
CSL3 = CSH3 = CSL5 = CSH5 = 5.5V
Not tested
Not tested
Not tested
240
0.01
CONDITIONS
MIN
200
200
200
350
10
TYP
MAX
UNITS
ns
ns
ns
kHz
µA
MAX1630A–MAX1635A
INTERNAL REGULATOR AND REFERENCE
VL Output Voltage
VL Undervoltage Lockout
Fault Threshold
VL Switchover Threshold
REF Output Voltage
REF Load Regulation
REF Sink Current
REF Fault Lockout Voltage
V+ Operating Supply Current
V+ Standby Supply Current
V+ Standby Supply Current
in Dropout
V+ Shutdown Supply Current
Quiescent Power Consumption
4.7
3.5
4.2
2.45
3.6
4.5
2.5
5.1
3.7
4.7
2.55
12.5
100.0
V
V
V
V
mV
µA
V
µA
µA
µA
µA
_______________________________________________________________________________________
3
Multi-Output, Low-Noise Power-Supply
Controllers for Notebook Computers
MAX1630A–MAX1635A
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.)
PARAMETER
FAULT DETECTION (MAX1630A/MAX1631A/MAX1632A)
Overvoltage Trip Threshold
Overvoltage-Fault Propagation Delay
Output Undervoltage Threshold
Output Undervoltage Lockout Time
Thermal Shutdown Threshold
RESET
RESET
Trip Threshold
RESET
Propagation Delay
RESET
Delay Time
INPUTS AND OUTPUTS
Feedback Input Leakage Current
Logic Input Low Voltage
Logic Input High Voltage
Input Leakage Current
Logic Output Low Voltage
Logic Output High Current
TIME/ON5 Input Trip Level
TIME/ON5 Source Current
TIME/ON5 On-Resistance
Gate Driver Sink/Source Current
Gate Driver On-Resistance
FB3, FB5; SECFB = 2.6V
RUN/ON3,
SKIP,
TIME/ON5 (SEQ = REF),
SHDN,
STEER, SYNC
RUN/ON3,
SKIP,
TIME/ON5 (SEQ = REF),
SHDN,
STEER, SYNC
RUN/ON3,
SKIP,
TIME/ON5 (SEQ = REF),
SHDN,
STEER, SYNC, SEQ; V
PIN
= 0V or 3.3V
RESET,
I
SINK
= 4mA
RESET
= 3.5V
SEQ = 0V or VL
TIME/ON5 = 0V, SEQ = 0V or VL
TIME/ON5; RUN/ON3 = 0V, SEQ = 0V or VL
DL3, DH3, DL5, DH5; forced to 2V
High or low
1
2.4
2.5
3
15
1
1.5
7
2.6
3.5
80
2.4
±1
0.4
1
50
0.6
nA
V
V
µA
V
mA
V
µA
Ω
A
Ω
With respect to unloaded output voltage,
falling edge; typical hysteresis = 1%
Falling edge, CSL_ driven 2%
below
RESET
trip threshold
With respect to f
OSC
27,000
-7
-5.5
1.5
32,000
37,000
-4
%
µs
Clks
With respect to unloaded output voltage
CSL_ driven 2% above overvoltage trip threshold
With respect to unloaded output voltage
From each SMPS enabled, with respect to f
OSC
Typical hysteresis = +10°C
60
5000
4
7
1.5
70
6144
150
80
7000
10
%
µs
%
Clks
°C
CONDITIONS
MIN
TYP
MAX
UNITS
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:
MAX1630A/MAX1632A/MAX1633A/MAX1635A 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.
4
_______________________________________________________________________________________
Multi-Output, Low-Noise Power-Supply
Controllers for Notebook Computers
MAX1630A–MAX1635A
__________________________________________Typical Operating Characteristics
(Circuit of Figure 1, 3A Table 1 components, T
A
= +25°C, unless otherwise noted.)
MAX1632A/MAX1635A
MAXIMUM 15V V
DD
OUTPUT
CURRENT vs. SUPPLY VOLTAGE
MAX1630A/35A toc02
EFFICIENCY vs. 5V OUTPUT CURRENT
MAX1630A/35A toc01
EFFICIENCY vs. 3.3V OUTPUT CURRENT
100
V+ = 6V
90
EFFICIENCY (%)
800
MAXIMUM OUTPUT CURRENT (mA)
V+ = 6V
V
DD
> 13V
5V REGULATING
600
5V LOAD = 0A
90
EFFICIENCY (%)
V+ = 15V
80
80
V+ = 15V
70
400
5V LOAD = 3A
200
70
ON5 = 5V
ON3 = 0V
f = 300kHz
MAX1631A/MAX1634A
0.001
0.01
0.1
1
10
60
60
ON3 = ON5 = 5V
f = 300kHz
MAX1631A/MAX1634A
0.001
0.01
0.1
1
10
50
5V OUTPUT CURRENT (A)
50
3.3V OUTPUT CURRENT (A)
0
0
5
10
SUPPLY VOLTAGE (V)
15
20
MAX1630A/MAX1633A
MAXIMUM 15V V
DD
OUTPUT
CURRENT vs. SUPPLY VOLTAGE
MAX1630A/35A toc04
PWM MODE INPUT CURRENT
vs. INPUT VOLTAGE
MAX1630A/35A toc05
IDLE MODE INPUT CURRENT
vs. INPUT VOLTAGE
ON3 = ON5 = 5V
SKIP = 0V
NO LOAD
INPUT CURRENT (mA)
1
MAX1630A/35A toc06
500
MAXIMUM OUTPUT CURRENT (mA)
V
DD
> 13V
3.3V REGULATING
400
3.3V LOAD = 0A
300
30
25
INPUT CURRENT (mA)
20
15
10
5
0
ON3 = ON5 = 5V
SKIP = VL
NO LOAD
10
200
3.3V LOAD = 3A
0.1
100
0
0
5
10
SUPPLY VOLTAGE (V)
15
20
0.01
0
5
10
15
20
25
30
0
5
10
15
20
25
30
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
STANDBY INPUT CURRENT
vs. INPUT VOLTAGE
ON3 = ON5 = 0V
NO LOAD
INPUT CURRENT (μA)
1000
MAX1630A/35A toc07
SHUTDOWN INPUT CURRENT
vs. INPUT VOLTAGE
MIN V
IN
TO V
OUT
DIFFERENTIAL (mV)
SHDN = 0V
8
INPUT CURRENT (μA)
MAX1630A/35A toc08
MINIMUM V
IN
TO V
OUT
DIFFERENTIAL
vs. 5V OUTPUT CURRENT
MAX1630A/35A toc09
10,000
10
1000
100
6
100
4
10
5V, 3A CIRCUIT
V
OUT
> 4.8V
f = 300kHz
1
0.001
0.01
0.1
1
10
10
2
1
0
5
10
15
20
25
30
INPUT VOLTAGE (V)
0
0
5
10
15
20
25
30
INPUT VOLTAGE (V)
5V OUTPUT CURRENT (A)
_______________________________________________________________________________________
5
MAX1630A/35A toc03
100
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