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RAA230231 Schematic ( PDF Datasheet ) - Renesas

Teilenummer RAA230231
Beschreibung Dual Step-Down DC/DC Converter
Hersteller Renesas
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Gesamt 27 Seiten
RAA230231 Datasheet, Funktion
RAA23022x RAA23023x [Under Development]
Preliminary
Preliminary Datasheet
RAA23022x RAA23023x [Under Development]
16V Input, 3A, Dual Step-Down DC/DC Converter
+ Battery Backup
R18DS0017EJ0000
REV.0.00
Aug.19.2014
Description
The RAA23022x and RAA23023x are dual step-down DC/DC converter, 4.5V to 16V input voltage rage and 3A
output current. Auto PFM mode makes devices low power operation at light load, so it makes a system lower
power.
The RAA23022x is suitable for battery backup system using lithium primary cell with built-in battery backup
circuit.
Features
z DC/DC
Input voltage range
4.5V to 16V
Shutdown current
1uA (typ.)
Auto PFM mode
Maximum output current
3A
Synchronous rectification type step-down DC/DC
Integrated power MOSFETs
Switching frequency
1.1MHz (fixed)
Output voltage range
0.8V to 6V
Internal phase compensator
Soft start
2ms (fixed)
Discharge circuit
Power Good
Battery backup circuit (RAA23022x)
z Protection circuit
Short circuit protection (latch type)
Thermal shutdown circuit
165°C (typ.)
Under voltage lockout circuit (recovery type)
z Package
20-pin HTSSOP
Application
Communication (Router, Home Gate Way, Radio, etc.)
Industrial (Surveillance camera, Various controller, etc.)
Building (Security device, Emergency device, Various controller, etc.)
OA (Printer, Plane paper copier, etc.)
Smart meter
Smart home appliances
And, usable various application
Note: The information contained in this document is being issued in advance of the production cycle for the product.
The parameters for the product may change before final production, or Renesas Electronics Corporation, at its
own discretion, may withdraw the product prior to its production.
A quality grade of these ICs is “Standard”. Recommended applications are indicated below.
Computers, office equipment, communications equipment, test and measurement equipment,
audio and visual equipment, home electronic appliances, machine tools, personal electronic equipment,
and industrial robots, etc.
R18DS0017EJ0000 REV.0.00
Aug.19.2014
Page 1 of 25






RAA230231 Datasheet, Funktion
RAA23022x RAA23023x [Under Development]
Preliminary
Pin Function
RAA23022x (2CH DCDC + Battery backup)
Pin No.
1
2
Symbol
PGND1
LX1
I/O
I/O CH1 Power Ground
O CH1 Inductor connection
Function
3 Boost1
4 VIN1
5 VOUT1
6 FB1
7 GND
I CH1 Boot strap input
(Connect 0.1uF capacitor between LX1 and Boost1)
I CH1 Power supply
I CH1 VOUT feedback
I CH1 Feedback resistor connection
I/O Analog Ground
8 VREG
O
Internal power supply output
(Connect 1uF capacitor between VREG and AGND)
9 PGOOD
Power good output (open drain)
O CH1 and CH2 stop :L
CH1 or CH2 operation : HiZ
10 x_AutoPFM
11 VBB_IN
12 VBB_OUT
Auto PFM mode ON/OFF
x_AutoPFM=”L” : Auto PFM mode (change automatically)
I PFM mode at light load
PWM mode at heavy load
x_AutoPFM=“H” : PWM mode (fixed)
I Battery connection
O Backup voltage output
13 EN1
CH1 enable
I EN1=“L” or open : CH1 Stop
EN1=”H”
: CH1 Operation
14 EN2
CH2 enable
I EN2=“L” or open : CH2 Stop
15 FB2
16 VOUT2
17 VIN2
EN2=”H”
: CH2 Operation
I CH2 Feedback resistor connection
I CH2 VOUT feedback
I CH2 Power supply
18 Boost2
19 LX2
20 PGND2
I CH2 Boot strap input
(Connect 0.1uF capacitor between LX2 and Boost2)
O CH2 Inductor connection
I/O CH2 Power Ground
R18DS0017EJ0000 REV.0.00
Aug.19.2014
Page 6 of 25

6 Page









RAA230231 pdf, datenblatt
RAA23022x RAA23023x [Under Development]
Detailed Description
Control Block
EN1, EN2 : ON/OFF setting
EN1 EN2
State
LL
Shutdown
(CH1 and CH2 stop)
HL
CH1 Operation
CH2 Stop
H H CH1 and CH2 Operation
LH
Ch1 Stop
CH2 Operation
Note: L: Low level, H: High level
VREG
0V
5.0V
5.0V
5.0V
Preliminary
x_autoPFM : AutoPFM mode/ PWM mode setting
x_autoPFM
Operation
L Auto PFM mode (change automatically)
PFM mode at light load
PWM mode at heavy load
H PWM mode (fixed)
Note: L: Low level, H: High level
PGOOD : Power Good output
State
PGOOD
CH1 and CH2 stop
L
CH1 or CH2 operation
HiZ
Note: L: Low level, H: High level
When VREG voltage falls under T.B.D. V, PGOOD pin becomes high impedance though CH1 and CH2 are
Low.
When using this function, connect PGOOD pin to VREG, VOUT1, VOUT2, etc.
R18DS0017EJ0000 REV.0.00
Aug.19.2014
Page 12 of 25

12 Page





SeitenGesamt 27 Seiten
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