MAX1637EEE Maxim Integrated Products, MAX1637EEE Datasheet - Page 10

• Manufacturer Part Number: MAX1637EEE
• Description: IC CTRLR MINI LV STPDWN 16-QSOP
• Manufacturer: Maxim Integrated Products
• Type: Step-Down (Buck)r

Specifications of MAX1637EEE

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 1.1 ~ 5.5 V
• Current - Output: 3A
• Frequency - Switching: Adj to 350kHz
• Voltage - Input: 3.15 ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-QSOP
• Power - Output: 667mW
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Miniature, Low-Voltage,
Precision Step-Down Controller
The heart of the current-mode PWM controller is a
multi-input, open-loop comparator that sums four sig-
nals: the output voltage error signal with respect to
the reference voltage, the current-sense signal, the
integrated voltage-feedback signal, and the slope-
Figure 3. PWM Controller Functional Diagram
10
-100mV
SHDN
______________________________________________________________________________________
SKIP
30mV
PWM Controller Block
SOFT-START
COUNTER
SLOPE
COMPENSATION
DAC
CK
RECTIFIER CONTROL
SYNCHRONOUS
R
S
Q
CURRENT
LIMIT
compensation ramp (Figure 3). The PWM controller is
a direct-summing type, lacking a traditional error
amplifier and the phase shift associated with it. This
direct-summing configuration approaches ideal
cycle-by-cycle control over the output voltage.
1X
gm
R
S
Q
OSC
2X
THROUGH
CONTROL
SHOOT-
LEVEL
SHIFT
LEVEL
SHIFT
REF
CSH
CSL
FB
REF
CC
BST
DH
LX
V
DL
PGND
GG