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R2A20101BM/NP
Monolithic Synchronous Step-Down DC/DC Converter
REJ03D0790-0300 Rev.3.00 May 14, 2008
Features
* Built-in low Ron power MOS FETs Pch Ron = 0.30 (Typ), Nch Ron = 0.14 (Typ) * High switching frequency: 2 MHz (Max) * Output current: 650 mA (Max) * Output ON/OFF control * Vout control * Power good monitor * Current share for redundant power supply operation * Vout = 0.5 V to (VIN - 0.5) V
Application
* POL (Point of Load) power supplies * Power supply for microcomputer systems MCU-Core, I/O, Memory (DDR, SRAM, FLASH, HDD, etc.), FPGA, DSP, Graphic Processor * Battery powered equipment systems Cellular phone (CDMA power amplifier, MCU, DSP, ASIC), PDA, Digital camera, Portable game, Handy terminal
Operating Circuit Example
Vin 2.5V to 5.5V Cin 4.7F
ON/OFF Power Good Signal Output
Error Amp. Output (for Current Share)
Vref Input (for Vout Control)
R2A20101
VIN
LX PGND CRFB
L1 2.2H
Iout: Up to 650mA
Vout 1.8V
Rcf2 68k
Ccf1 47pF
Rvf2 390k Rvf1 150k
PWGD EAO
Rcf1 100k
Cout 4.7F
VFB
AGND VREF (Internal Vref = 0.5V)
Notes: 1. All ceramic capacitor 2. Rcf1 : Rcf2(recommend) = 3 : 2 3. fsw is adjustable by Ccf1, Rcf1, and Rcf2.
REJ03D0790-0300 Rev.3.00 May 14, 2008 Page 1 of 9
R2A20101BM/NP
Block Diagram
ON/OFF
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SHDN Shut Down PWGD Power Good Comparator UVLO VIN
Ref 1.15V
- +
1.3M VREF 1.5k EAO 1M
Vref x 10%
+ -
PWM Control Logic
LX PGND CRFB VFB AGND
SS
Error Amplifier
Absolute Maximum Ratings
(Ta = 25C)
Item Power supply voltage ON/OFF, PWGD, EAO, VREF, LX, CRFB, VFB terminal voltage PGND terminal voltage Operating ambient temperature Junction temperature 1 Junction temperature 2 Storage temperature Symbol VIN VMAX VPGND Topr(Ta) Tjmax1 Tjmax2 Tstg Ratings 6 -0.3 to (VIN + 0.3) -0.3 to +0.3 -40 to +85 +125 +150 -55 to +150 Unit V V V C C C C Note 1 1 1
2
Notes: 1. Rated voltages are with reference to the AGND pin. 2. Operation by Tjmax2 is made within 24 hours through life.
REJ03D0790-0300 Rev.3.00 May 14, 2008 Page 2 of 9
R2A20101BM/NP
Pin Arrangement
R2A20101BM (CSP-15) 5 A A5 B C C5 D E E5 F F4 D4 E3 F2 B4 C3 D2 E1
10 R2A20101NP (QFN-24)
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4
3 A3
2
1 A1
13
14
15
16
17
18
B2 C1
12
19
11
20
21
(Bottom view)
9
22
8
23
7
24
6
5
4
3
2
1
(Bottom view)
Pin Description
Pin No. R2A20101BM (CSP-15) A1, A3, A5 B2, B4 C1, C3, C5 D4 D2 E5 E1 F4 E3 F2 Note: R2A20101NP (QFN-24) 15, 16, 17 11, 20 10, 21 22 9 23 8 2 5 4 Pin Name PGND LX VIN ON/OFF CRFB PWGD VFB EAO VREF AGND Pin Function Power ground Inductor connection node Power supply voltage input Output on/off control input CR feedback input Power good monitor output Feedback voltage input Error amplifier output (for current share) Vout control voltage input Analog ground (IC chip ground voltage)
Please apply solder to pins 1, 3, 6, 7, 12, 13, 14, 18, 19, and 24 even though they are NC pins. Solder on the underside pads improves heat-radiation characteristics.
REJ03D0790-0300 Rev.3.00 May 14, 2008 Page 3 of 9
R2A20101BM/NP
Electrical Characteristics
Item Input voltage range UVL threshold high UVL hysteresis Quiescent supply current Shutdown supply current Reference voltage Vref line regulation Vref temperature stability VREF sink current VREF source current VFB leakage current Pch FET on resistance Nch FET on resistance Pch FET leakage current Nch FET leakage current Peak current limit ON/OFF threshold high ON/OFF threshold low ON/OFF leakage current ON/OFF input current Switching frequency Soft start time Power good threshold Power good VOL Power good VOH Output voltage load regulation Symbol Vin Vuvl-Hi Vuvl-Hys Iss Ishdn Vref dVref/dVin dVref/dTa Ivref-sink Ivref-source Ileak-VFB Ron-Pch Ron-Nch Ileak-Pch Ileak-Nch Ipeak-Limit Von/off-Hi Von/off-Lo Ileak-on/off Iinput-on/off fsw tss Vth-PGood Ipg-VOL Ipg-VOH dVout/dIout Min 2.5 2.0 0.15 20 -- 0.485 (-0.4) -- 1.3 0.3 -1 -- -- -- -- 0.7 1.0 0.75 -1 -- Typ -- 2.3 0.22 45 0.0 0.500 0.1 (100) 3.7 0.9 0 0.30 0.14 -- -- -- 1.45 1.24 0 1.4 Max 5.5 2.5 0.29 80 1.0 0.515 (0) -- 8.0 2.0 +1 0.50 0.25 1.0 1.0 -- 1.85 1.65 +1 5 Unit V V V A A V %/V ppm/C A A A A A A V V A A Hz s % A A %/A
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(Ta = 25C, Vin = 3.6 V, ON/OFF = Vin, unless otherwise specified.)
Test Conditions VFB = CRFB = GND, Vin = rising
ON/OFF = 0V Vin = 2.5 to 5.5V Ta = -40 to +85C Vref = 2.5V Vref = 0V VFB = 1/2 x Vin VFB = CRFB = 0V, ILX = -100mA VFB = CRFB = Vin, ILX = 100mA ON/OFF = 0V, LX = 0V ON/OFF = 0V, LX = Vin ON/OFF = rising ON/OFF = falling ON/OFF = Vin ON/OFF = 0.9V
Adjustable by external Ccf1, Rcf1, Rcf2 56 x Rcf1/(Rcf1 + Rcf2) x Vout (-15) 20 -10 -- -10 -- -- 0.7 (-5) -- -- --
Vref = 0.5V PWGD = 0.2V, VFB = 0V PWGD = 3.4V, VFB = 0.5V L = 2.2H, Vout = 1.8V, Iout = 0 to 650mA
Note:
( ) is design spec.
REJ03D0790-0300 Rev.3.00 May 14, 2008 Page 4 of 9
R2A20101BM/NP
Main Characteristics
CR Feedback Constant vs. Switching Frequency 1.8 1.7 1.6
fsw (MHz)
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1.5 1.4 1.3 1.2 1.1 1.0 1 10 100 Ccf1 (pF) 1000 10000
Rcf1: 3.3k Rcf2: 2.2k Rcf1: 10k Rcf2: 6.8k Rcf1: 33k Rcf2: 22k Rcf1: 330k Rcf2: 220k
Range of CR Feedback Constant Selection 10000
2700 1100 Range of CR feedback constant selection
Ccf1 (pF)
1000
100
33
10
12
1
2.2
10 Rcf2 (k)
100
220
1000
Reference Voltage vs. Ambient Temperature 0.520 0.515 0.510
Switching Operating Current vs. Ambient Temperature 14 12 10
Iin (mA)
Vref (V)
0.505 0.500 0.495 0.490 0.485 0.480 -50 -25 0 25 50 Ta (C) 75 100 125
8 6 4 2 0 -50 -25 0 25 50 Ta (C) 75 100 125
REJ03D0790-0300 Rev.3.00 May 14, 2008 Page 5 of 9
R2A20101BM/NP
Shutdown Current vs. Ambient Temperature 1.4 1.2
Vout Line Regulation
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Ishdn (A)
1.0 0.8 0.6 0.4 0.2 0.0 -50 -25 0 25 50 Ta (C) 75 100 125
1.90 1.88 1.86 1.84 1.82 1.80 1.78 1.76 1.74 1.72 1.70
Vout = 1.8V, Iout = 0A
Vout (V)
2.5
3.0
3.5
4.0
Vin (V)
4.5
5.0
5.5
Vout Load Regulation
VREF Impressed Voltage vs. Vout
0 50 100 150 200 250 300 350 400 450 500 550 600 650
1.90 1.88 1.86 1.84 1.82 1.80 1.78 1.76 1.74 1.72 1.70
Vin = 3.6V, Vout = 1.8V
5.5 LX 5.0 CRFB 4.5 4.0 VFB 3.5 VREF 3.0 2.5 2.0 1.5 1.0 0.5 0.0 0.0
L 2.2H
Rcf2 68k
Rcf1 Ccf1 100k 47pF
Rvf2 390k Cout Rvf1 4.7F 150k
VOUT
Vout, EAO (V)
Vout (V)
Vout (Ta = -40C) Vout (Ta = 85C) EAO (Ta = -40C) EAO (Ta = 85C)
0.5
VREF (V)
1.0
1.5
Iout (mA)
Transient Response Characteristics
[T]
VIN = 3.6V Vout = 1.8V Iout = 0 <-> 650mA
Vout(100mV/div.)
50s/div
Iout: 0mA->650mA->0mA
T
Iout(500mV/div.)
4
REJ03D0790-0300 Rev.3.00 May 14, 2008 Page 6 of 9
R2A20101BM/NP
Application Circuit Example
1. Current Share 1 (Redundant, Hot Swap type)
R2A20101
VIN ON/OFF PWGD EAO
VREF
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Vin
ON1
LX PGND CRFB VFB AGND
Vout
Gnd
Vout
R2A20101
VIN LX PGND CRFB VFB AGND
Iout1
ON2
ON/OFF PWGD EAO
VREF for Stable
Iout2 ON1 ON2
Note: Dotted line is not always necessary.
2. Current Share 2 (Accuracy type)
R2A20101
VIN ON/OFF PWGD EAO
VREF
Vin
ON
LX PGND CRFB VFB AGND
Vout
for Accuracy
for Accuracy
Gnd
R2A20101
VIN ON/OFF PWGD EAO
VREF
for Stable
LX PGND CRFB VFB AGND
Be able to eliminate by connecting VFB together
for Soft start time adjustment
Note: Dotted line is not always necessary.
REJ03D0790-0300 Rev.3.00 May 14, 2008 Page 7 of 9
R2A20101BM/NP 3. Sequential Start-up
R2A20101
VIN ON/OFF PGood1 PWGD EAO
VREF
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Vin
ON
LX PGND CRFB VFB
Vout1
Vout1
AGND
Vout2
for Soft start time adjustment for Sequencing
PGood1
R2A20101
VIN ON/OFF LX PGND CRFB VFB AGND
Vout2
PGood2
PWGD EAO
VREF
for Soft start time adjustment Note: Dotted line is not always necessary.
4. Tracking
R2A20101
VIN ON/OFF PWGD EAO DAC
VREF
Vin
ON
LX PGND CRFB VFB AGND
for Tracking
Vout1
Vout1 Vout2
for Vout control
R2A20101
VIN ON/OFF PWGD EAO
VREF
LX PGND CRFB VFB AGND
Vout2
Note: Dotted line is not always necessary.
REJ03D0790-0300 Rev.3.00 May 14, 2008 Page 8 of 9
R2A20101BM/NP
Package Dimensions
Preliminary
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Unit: mm
1.26 0.05 0.46
3 5 2 4 7 9 11 13 14 15 10 12 6 1
0.08 0.03
1.96 0.05
8
0.20 0.03
(Bottom view)
0.4
0
0.07
0.4 0.02
Package Code JEDEC JEITA Mass (reference value)
CSP-15 -- -- --
Preliminary
B
Unit: mm
4.00 0.10
A
12
13
2.50
18 19
4.00 0.10
C0.40
7
24
6
0.50
24 x
24 x
0.23 0.05
0.10 C
C
0.10 M C A B
0.08 C
0.80Max
0-0.05
0.20
Package Code JEDEC JEITA Mass (reference value)
WQFN0404-24 -- -- --
REJ03D0790-0300 Rev.3.00 May 14, 2008 Page 9 of 9
0.40 0.1
0.15 C
0.15 C
Pin No.1
2.50
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