L6725A STMicroelectronics, L6725A Datasheet - Page 4

• Manufacturer Part Number: L6725A
• Description: IC PWM CTLR VOLTAGE MODE SO-16N
• Manufacturer: STMicroelectronics

Specifications of L6725A

• Pwm Type: Voltage Mode
• Number Of Outputs: 1
• Frequency - Max: 550kHz
• Duty Cycle: 100%
• Voltage - Supply: 4.5 V ~ 18 V
• Buck: Yes
• Boost: No
• Flyback: No
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: No
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 16-SOIC (3.9mm Width)
• Frequency-max: 550kHz
• Output Voltage: 0.603 V
• Input Voltage: 1.8 V to 18 V
• Switching Frequency: 500 KHz
• Operating Temperature Range: - 40 C to + 125 C
• Mounting Style: SMD/SMT
• Duty Cycle (max): 100 %
• Package: SO16N
• For Use With: 497-5867 - EVAL BOARD 20A 250KHZ L6725497-5500 - EVAL BOARD FOR L6725
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Summary description
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1.1
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Summary description
The device is a flexible high performance PWM buck controller dedicated for low voltage
distributed DC-DC. The input voltage can range from 1.8V to 18V, while the supply voltage can
range from 4.5V to 18V. The output voltage is adjustable down to 0.6V.
High peak current gate drivers provide for fast switching to the external power section, and the
output current can be in excess of 20A. The device is capable to manage minimum on-times
(T
switching frequency. In order to guarantee a real overcurrent protection, also with very narrow
T
necessary, two different current limit protections can be externally set through an external
resistor. The device can sink current after the soft-start phase while, during the soft-start, the
sink mode capability is disabled in order to allow a proper start-up also in pre-biased output
voltage conditions. Other features are over-voltage-protection and thermal shutdown.
Functional description
Figure 1.
ON
ON
, the current sense is realized both on the high-side and low-side MOSFETs. When
) shorter than 100ns making possible conversions with very low duty cycle and very high
PGOOD
EAREF
EAREF
SYNCH
SS
SS
Block diagram
Protection and Ref
Protection and Ref
OCL
OCL
Monitor
Monitor
+
+
-
-
0.6V
Vcc=4.5V-14V
OCH
OCH
Vcc = 14V - 18V
OSC
OSC
L6725
LDO
LDO
FB
FB
+
+
-
-
+
+
+
VCCDR
VCCDR
PWM
PWM
-
-
-
E/A
E/A
-
-
COMP
COMP
BOOT
BOOT
HGATE
HGATE
PHASE
PHASE
LGATE
LGATE
PGND
PGND
GND
GND
Vin = 14V - 18V
Vin=1.8V-14V
L6725 - L6725A
V
OUT