MAX1639ESE+ Maxim Integrated Products, MAX1639ESE+ Datasheet - Page 6

• Manufacturer Part Number: MAX1639ESE+
• Description: IC STEP-DWN CTRLR HI-SPD 16-SOIC
• Manufacturer: Maxim Integrated Products
• Type: Step-Down (Buck)r

Specifications of MAX1639ESE+

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 1.1 ~ 4.5 V
• Current - Output: 35A
• Frequency - Switching: 300kHz, 600kHz, 1MHz
• Voltage - Input: 4.5 ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (3.9mm Width)
• Power - Output: 696mW
• Output Voltage: 1.1 V to 4.5 V
• Output Current: 35 A
• Input Voltage: 4.5 V to 5.5 V
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

High-Speed Step-Down Controller with
Synchronous Rectification for CPU Power
6
Figure 1. Standard Application Circuit
The predesigned MAX1639 circuit shown in Figure 1
meets a wide range of applications with output currents
up to 35A. Use Table 1 to select components appropri-
ate for the desired output current range, and adapt the
evaluation kit PC board layout as necessary. This cir-
cuit represents a good set of trade-offs between cost,
size, and efficiency while staying within the worst-case
specification limits for stress-related parameters, such
as capacitor ripple current.
The MAX1639 circuit was designed for the specified fre-
quencies. Do not change the switching frequency with-
_______Standard Application Circuits
_______________________________________________________________________________________
AGND
0.1µF
TO
C5
100k
R6
C4, 1.0µF
CERAMIC
RC1
1k
TO V
10µF
C6
0.056µF
DD
1000pF
CC2
CC1
PWROK
FREQ
REF
CC2
CC1
V
CC
MAX1639
10Ω
R5
V
PGND
AGND
DD
CSH
BST
CSL
DH
DL
LX
FB
0.1µF
(OPTIONAL)
(OPTIONAL)
C7
R3
R4
out first recalculating component values—particularly
the inductance, output filter capacitance, and RC1
resistance values.
The MAX1639 is a BiCMOS power-supply controller
designed for use in switch-mode, step-down (buck)
topology DC-DC converters. Synchronous rectification
provides high efficiency. It is intended to provide the
high precision, low noise, excellent transient response,
and high efficiency required in today’s most demand-
ing applications.
___________________Detailed Description
N1
N2
D2
CMPSH-3
D1
(OPTIONAL)
C3
0.1µF
L1
R8
C1
R1
R7
C8
C2
V
V
OUT
IN
TO 5.5V
TO 4.5V
= 4.5V
= 1.1V