MAX1632EAI+ Maxim Integrated Products, MAX1632EAI+ Datasheet - Page 6

• Manufacturer Part Number: MAX1632EAI+
• Description: IC PWR-SUPP CTRLR NOTEBK 28-SSOP
• Manufacturer: Maxim Integrated Products
• Type: Step-Down (Buck)r

Specifications of MAX1632EAI+

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 3
• Voltage - Output: 3.3V, 5V, Adj
• Current - Output: 4A
• Frequency - Switching: 200kHz, 300kHz
• Voltage - Input: 4.2 ~ 30 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-SSOP
• Power - Output: 762mW
• Output Voltage: 2.5 V to 5.5 V, 3.3 V, 5 V
• Input Voltage: 4.2 V to 30 V
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Multi-Output, Low-Noise Power-Supply
Controllers for Notebook Computers
(Circuit of Figure 1, 3A Table 1 components, T
6
____________________________________Typical Operating Characteristics (continued)
__________________________________________________________________________Pin Description
PIN
_______________________________________________________________________________________
1
2
3
4
1000
2.510
2.505
2.500
2.495
2.490
2.485
2.480
100
0.1
(MAX1630/
(MAX1631/
10
MAX1634)
32/33/35)
1
12OUT
STEER
NAME
CSH3
CSL3
0.1
FB3
0
+3.3V, V
V
ON3 = ON5 = 0V
IN
1
= 15V
SWITCHING FREQUENCY
REF OUTPUT VOLTAGE
IN
vs. OUTPUT CURRENT
1
vs. LOAD CURRENT
OUTPUT CURRENT (mA)
= 15V
LOAD CURRENT (mA)
2
Current-Sense Input for the 3.3V SMPS. Current-limit level is 100mV referred to CSL3.
Current-Sense Input. Also serves as the feedback input in fixed-output mode.
Feedback Input for the 3.3V SMPS; regulates at FB3 = REF (approx. 2.5V) in adjustable mode. FB3 is a
Dual Mode input that also selects the 3.3V fixed output voltage setting when tied to GND. Connect FB3
to a resistor divider for adjustable-output mode.
12V/120mA Linear Regulator Output. Input supply comes from V
1µF minimum.
Logic-Control Input for secondary feedback. Selects the PWM that uses a transformer and secondary
feedback signal (SECFB):
+5V, V
+5V, V
10
STEER = GND: 3.3V SMPS uses transformer
STEER = VL: 5V SMPS uses transformer
3
IN
IN
= 15V
+3.3V, V
= 6V
4
IN
100
= 6V
5
A
1000
= +25°C, unless otherwise noted.)
6
FUNCTION
3.3V OUTPUT
5V OUTPUT
5V/div
2V/div
5V/div
5V/div
5.00
4.98
4.96
4.94
4.92
4.90
TIME
RUN
0
SEQ = VL, 0.015μF CAPACITOR ON-TIME
V
ON3 = ON5 = 0V
VL REGULATOR OUTPUT VOLTAGE
IN
DD
= 15V
10
. Bypass 12OUT to GND with
START-UP WAVEFORMS
vs. OUTPUT CURRENT
OUTPUT CURRENT (mA)
20
2ms/div
30
40
50
60