LP3952RLX National Semiconductor, LP3952RLX Datasheet - Page 9

• Manufacturer Part Number: LP3952RLX
• Manufacturer: National Semiconductor

Specifications of LP3952RLX

• Operating Supply Voltage (typ): 3.3/5V
• Number Of Segments: 6
• Operating Temperature (min): -30C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Commercial
• Pin Count: 36
• Mounting: Surface Mount
• Operating Supply Voltage (min): 2.7V
• Operating Supply Voltage (max): 5.5V
• Lead Free Status / Rohs Status: Not Compliant

I
V
RDS
f
t
t
I
LOAD
boost
PULSE
STARTUP
SW_MAX
OUT
Symbol
Magnetic Boost DC/DC Converter Electrical Characteristics
BOOST STANDBY MODE
User can stop the Boost Converter operation by writing the
Enables register bit EN_BOOST low. When EN_BOOST is
written high, the converter starts for 10 ms in PFM mode and
then goes to PWM mode.
BOOST OUTPUT VOLTAGE CONTROL
User can control the boost output voltage by boost output 8-
bit register.
ON
0000 0000
0000 0001
0000 0011
0000 0111
0000 1111
0001 1111
0011 1111
0111 1111
1111 1111
Boost Output [7:0]
Bin
Load Current
Output Voltage Accuracy
(FB Pin)
Output Voltage
(FB Pin)
Switch ON Resistance
PWM Mode Switching
Frequency
Frequency Accuracy
Switch Pulse Minimum
Width
Startup Time
SW Pin Current Limit
Register 0DH
Parameter
Hex
0F
1F
3F
7F
FF
00
01
03
07
Voltage (typical)
Boost Output
5.00 Default
4.00
4.25
4.40
4.55
4.70
4.85
5.15
5.30
3.0V
V
3.0V
V
3.0V
V
1 mA
V
V
RT = 82 kΩ
freq_sel[2:0] = 1XX
2.7
RT = 82 kΩ
no load
Boost startup from STANDBY
OUT
OUT
OUT
IN
DD1,2
> 5V + V
≤
≤
≤
≤
= 5V
= 4V
= 5.0V
≤
VDDA
= 2.8V, I
V
V
V
I
LOAD
IN
IN
IN
≤
(SCHOTTKY)
≤
V
≤
Conditions
OUT
2.9
SW
300 mA
= 0.5A
- 0.5
9
BOOST FREQUENCY CONTROL
Register ‘boost freq’ (address 0EH). Register default value
after reset is 07H.
freq_sel[2:0]
Boost Output Voltage Control
1XX
01X
001
Min
700
550
−5
−6
−9
0
0
V
IN
–V
Typ
(SCHOTTKY)
800
0.4
±3
25
10
2
frequency
2.00 MHz
1.67 MHz
1.00 MHz
Max
300
400
900
950
www.national.com
30023809
0.8
+5
+6
+9
Units
MHz
mA
mA
ms
ns
%
%
V
Ω