LCJ/JH 9/22/05 (P1)
19-2729; Rev 1; 8/05
KIT
ATION
EVALU
BLE
AVAILA
3.6A, 1.4MHz, Low-Voltage, Internal-Switch Step-
Down Regulator with Dynamic Output Voltage Control
General Description
The MAX1536 constant-off-time, pulse-width-modulated
(PWM) step-down DC-to-DC converter is ideal for use in
+5.0V and +3.3V to low voltages for notebook and sub-
notebook computers. The MAX1536 features an internal
PMOS power switch and internal synchronous rectifica-
tion for high efficiency and reduced component count. No
external Schottky diode is required across the internal
synchronous rectifier switch. The internal 54m惟 PMOS
power switch and 47m惟 NMOS synchronous-rectifier
switch easily deliver continuous load currents up to 3.6A.
The MAX1536 produces dynamically adjustable output
voltages for chipsets and graphics processor cores using
a logic-level control signal. The MAX1536 achieves effi-
ciencies as high as 96%.
The MAX1536 uses a unique current-mode, constant-off-
time, PWM control scheme. It has selectable Idle
Mode
TM
to maintain high efficiency during light-load
operation, or fixed-PWM mode for low output ripple. The
programmable constant-off-time architecture allows a
wide range of switching frequencies up to 1.4MHz, opti-
mizing performance trade-offs between efficiency, output
switching noise, component size, and cost. The
MAX1536 features a digital soft-start to limit surge cur-
rents during startup, a 100% duty-cycle mode for low-
dropout operation, and a low-power shutdown mode that
disconnects the input from the output and reduces supply
current below 1碌A. The MAX1536 is available in a 28-pin
thin QFN package with an exposed backside pad.
Features
鈾?/div>
Dynamically Selectable Output Voltage from
+0.7V to V
IN
鈾?/div>
Internal PMOS/NMOS Switches
54m惟/47m惟 On-Resistance at V
IN
= +4.5V
63m惟/53m惟 On-Resistance at V
IN
= +3.0V
鈾?/div>
+3.0V to +5.5V Input Voltage Range
鈾?/div>
1.4MHz Maximum Switching Frequency
鈾?/div>
2V 卤0.75% Reference Output
鈾?/div>
Constant-Off-Time PWM Operation
鈾?/div>
Selectable Idle Mode/PWM Operation at Light
Loads
鈾?/div>
100% Duty Factor in Dropout
鈾?/div>
Digital Soft-Start Inrush Current Limiting
鈾?/div>
<1碌A Typical Shutdown Supply Current
鈾?/div>
<750碌A Quiescent Supply Current
鈾?/div>
Thermal Shutdown
鈾?/div>
1% V
OUT
Accuracy Over Line and Load
鈾?/div>
External Reference Input
鈾?/div>
Power-Good Window Comparator
鈾?/div>
Selectable Power-Good Blanking Time During
Output-Voltage Transition
MAX1536
Ordering Information
PART
MAX1536ETI
MAX1536ETI+
TEMP RANGE
-40 C to +85 C
-40
o
C to +85
o
C
o
o
________________________Applications
Chipset/Graphics Cores
with Dual-Supply Voltages
Active Termination Buses
Notebook Computers
DDR Memory Termination
PIN-PACKAGE
28 Thin QFN 5mm x 5mm
28 Thin QFN 5mm x 5mm
+Denotes
lead-free package.
Pin Configuration
FBLANK
PGOOD
V
CC
LX
IN
IN
Minimal Operating Circuit
V
IN
+3.0V TO +5.5V
V
OUT
+0.7V TO V
IN
IN
LX
FB
V
CC
SHDN
COMP
PGND
AGND
TOP VIEW
21
PGND
PGND
LX
N.C.
LX
PGND
PGND
20
19
18
17
16
15
14
13
12
11
REF
REFIN
OD
OD
GATE
TOFF
N.C.
22
23
24
25
MAX1536
26
27
28
1
LX
EXPOSED PADDLE
AGND
10
9
8
6
FB
MAX1536
REF
PGOOD
TOFF
SKIP
REFIN
2
IN
3
IN
4
SHDN
5
SKIP
7
COMP
THIN QFN
A "+" SIGN WILL REPLACE THE FIRST PIN INDICATOR ON LEAD-FREE PACKAGES.
Idle Mode is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.
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