r5895 - trunk/gta02-core/bom/research
werner at docs.openmoko.org
werner at docs.openmoko.org
Sun Apr 4 08:29:10 CEST 2010
Author: werner
Date: 2010-04-04 08:29:10 +0200 (Sun, 04 Apr 2010)
New Revision: 5895
Added:
trunk/gta02-core/bom/research/u1702
Modified:
trunk/gta02-core/bom/research/STATUS
Log:
Researched the Richtek RT9013-12PB
Modified: trunk/gta02-core/bom/research/STATUS
===================================================================
--- trunk/gta02-core/bom/research/STATUS 2010-04-04 05:44:33 UTC (rev 5894)
+++ trunk/gta02-core/bom/research/STATUS 2010-04-04 06:29:10 UTC (rev 5895)
@@ -9,7 +9,6 @@
JAR02-062101 jk4401 manuf. may be dead, inc. subst. likely
PCF50633HN/04/N3,5 u1701 large minimum order
PPR06-023104
-RT9013-12PB
RT9711BPB u4905 not researched yet
SC32442B54 u1501 not found yet, brokers list it
TD028TTEC1 lcm not found yet, brokers list it
@@ -23,17 +22,19 @@
of substitute only | Mech| Functn
if indicated) | | Pins|
---------------------- -------------- ---------------------- +-+-+-+-+------
-AAT1275IRN-5.0-T1 u4904 not found yet X - X X 1)
+AAT1275IRN-5.0-T1 u4904 not found yet X - X X 1
BF2520-B2R4CAB/LF u8002 not found yet X - - - -
BTP-03JA4G con1701 no distributor X ? ? - -
FA2012-KR40PAA u6007 not found yet X - - - -
HT-210UD/NB led1501 long lead time X - X ? colors
IT3205BE x7601 not found, sub. expens X - - - -
R3113D241A-TR-F u7604 not found yet X - X - -
+RT9013-12PB u1702 not found yet - - 2 - -
SN74AUP1G00DCKR u4902 borderline availab. X - - - -
WTE06016 ant8001 not found X X ? - -
1) No fault indication
+2) Pin NC in original has function
OPTIMIZATION:
Added: trunk/gta02-core/bom/research/u1702
===================================================================
--- trunk/gta02-core/bom/research/u1702 (rev 0)
+++ trunk/gta02-core/bom/research/u1702 2010-04-04 06:29:10 UTC (rev 5895)
@@ -0,0 +1,17 @@
+U1702: Richtek RT9013-12PB
+
+The RT9013 is used to regulate IO_1V8 down to STBY_1V2. Interestingly,
+the chip is specified with a minimum input voltage of 2.2 V. However,
+this seems to contradict the Vdrop of 250 mV. The data sheet doesn't
+indicate how to resolve this conflict.
+
+Alternatives with the same package, similar pinout, but a lower minimum
+input voltage, and a lower maximum current:
+
+- ON Semiconductor NCP585DSN12T1G or NCP585HSN12T1G
+ http://www.onsemi.com/pub_link/Collateral/NCP585-D.PDF
+ (note: pin 4 is NC in the RT9013 but "ECO" in the NCP585)
+
+ Package Vmin Vdrop Imax Caps Enable
+RT9013-12PB SOT-23-5 2.2 V 250 mV 500 mA 2 x 1uF H
+NCP585DSN12T1G SOT-23-5 1.4 V ~400 mV 300 mA 2 x 1uF H
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