MAX1904ETJ+ Maxim Integrated Products, MAX1904ETJ+ Datasheet - Page 9

• Manufacturer Part Number: MAX1904ETJ+
• Description: IC CNTRLR PWR SPLY LN 32-TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX1904ETJ+

• Applications: Controller, Notebook Computers
• Voltage - Input: 4.2 ~ 30 V
• Number Of Outputs: 4
• Voltage - Output: 2.5 ~ 5 V
• Operating Temperature: 0°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 32-TQFN Exposed Pad
• Output Voltage: 3.3 V, 5 V, 2.5 V to 5.5 V
• Output Current: 5 A
• 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

SSOP
500kHz Multi-Output, Low-Noise Power-Supply
10
11
12
13
14
1
2
3
4
5
6
7
8
9
PIN
QFN
29
30
31
10
11
12
1
2
3
4
5
7
8
9
_______________________________________________________________________________________
(MAX1902)
(MAX1901/
(MAX1902)
(MAX1901/
MAX1904)
MAX1904)
TIME/ON5
Controllers for Notebook Computers
12OUT
SECFB
STEER
RESET
NAME
CSH3
SYNC
CSH5
CSL3
CSL5
GND
SKIP
FB3
V
REF
FB5
DD
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 connected to GND. Connect FB3 to a resistor-divider for
adjustable-output mode.
12V/120mA Linear-Regulator Output. Input supply comes from V
GND with 1µF (min).
Logic-Control Input for Secondary Feedback. Selects the PWM that uses a transformer
and secondary feedback signal (SECFB):
Supply Voltage Input for the 12OUT Linear Regulator. Also connects to an internal
resistor-divider for secondary winding feedback and to an 18V overvoltage shunt
regulator clamp.
Secondary Winding Feedback Input. Normally connected to a resistor-divider from an
auxiliary output. SECFB regulates at V
Regulation Loop section). Connect to V
Oscillator Synchronization and Frequency Select. Connect to V
connect to GND for 333kHz operation. Can be driven at 400kHz to 583kHz for external
synchronization.
Dual-Purpose Timing Capacitor Pin and ON/OFF Control Input. See the Power-Up
Sequencing and ON/ OFF Controls section.
Low-Noise Analog Ground and Feedback Reference Point
2.5V Reference Voltage Output. Bypass to GND with 1µF (min).
Log i c- contr ol i np ut that d i sab l es i d l e m od e w hen hi g h. C onnect to GN D for nor m al use.
Active-Low Timed Reset Output. RESET swings GND to V
32,000 clock-cycle delay following power-up.
Feedback Input for the 5V SMPS. Regulates at FB5 = REF (approx. 2.5V) in adjustable
mode. FB5 is a dual-mode input that also selects the 5V fixed output voltage setting
when connected to GND. Connect FB5 to a resistor-divider for adjustable-output
mode.
C ur r ent- S ense Inp ut for the 5V S M P S . Al so ser ves as the feed b ack i np ut i n fi xed - outp ut
m od e, and as the b ootstr ap sup p l y i np ut w hen the vol tag e on C S L5/V
Current-Sense Input for the 5V SMPS. Current-limit level is 100mV referred to CSL5.
STEER = GND: 3.3V SMPS uses transformer
STEER = V
L
: 5V SMPS uses transformer
FUNCTION
SECFB
L
if not used.
= 2.5V (see the Secondary Feedback
L
. Goes high after a fixed
Pin Description
L
DD
for 500kHz operation;
L
. Bypass 12OUT to
i s > 4.5V .
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